:root {
  /* Palette — WARM green identity (revised 2026-06-04 for warmth). Green stays the
     brand; neutrals are warm (not cool slate); shadows warm; corners slightly
     sharper. Token NAMES unchanged so all component CSS keeps working.
     See docs/rules/DESIGN_DIRECTION.md. */
  --green-dark: #235c43;
  --green-mid: #2f8a5b;
  --green-light: #7cc49a;
  --green-pale: #c2e2cd;
  --green-mist: #e8f3ea;
  --green-snow: #f3f6f0;
  --white: #ffffff;
  --text-dark: #232c26;
  --text-mid: #4c574f;
  --text-soft: #656c64;
  --red: #d9534f;
  --red-light: #fdeceb;
  --amber: #e0a23c;
  --amber-light: #fdf2e0;
  --shadow: 0 2px 10px rgba(38,60,44,0.08);
  --shadow-hover: 0 8px 26px rgba(38,60,44,0.14);
  --radius: 6px;
  --radius-sm: 4px;
  --sidebar-w: 270px;
  --header-h: 56px;
  --tabbar-h: 64px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f1f2ea;
  color: var(--text-dark);
  font-family: var(--font-sans);
}

body.app-shell {
  display: block;
  /* cooler, "techy" canvas: light slate base with a faint blueprint grid +
     soft slate glows in the corners (kept very low-opacity so it never shouts) */
  background-color: #eef1f5;
  background-image:
    radial-gradient(circle at 0% 0%, rgba(52,70,95,0.06), transparent 44%),
    radial-gradient(circle at 100% 6%, rgba(45,86,90,0.05), transparent 42%),
    linear-gradient(rgba(52,70,95,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(52,70,95,0.035) 1px, transparent 1px);
  background-size: auto, auto, 30px 30px, 30px 30px;
  background-attachment: fixed;
}

button,
input,
select,
textarea {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

/* WCAG 2.4.7 — consistent, visible keyboard focus ring on every interactive
   element (baseline). Elements with their own :focus-visible treatment (text
   links that underline, etc.) override this via higher specificity. */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible,
[role="button"]:focus-visible,
[role="tab"]:focus-visible {
  outline: 3px solid var(--green-mid);
  outline-offset: 2px;
  border-radius: 4px;
}

h1,
h2,
h3,
h4,
h5,
h6,
.section-title,
.page-header h2,
.topic-card h3,
.topic-grid-card h3,
.download-card h3,
.card h3 {
  font-family: var(--font-heading);
}

#sidebar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 16px;
  height: 60px;
  padding: 0 clamp(16px, 3vw, 32px);
  background: var(--white);
  border-bottom: 1px solid #e6e2d8;
}

body.sidebar-collapsed #sidebar {
  transform: none;
  opacity: 1;
  pointer-events: auto;
}

#sidebar-restore-tab { display: none !important; }

/* (removed 2026-06-04: dead .sidebar-logo lockup styles) */

.logo-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 34px;
  color: #1a4a4a;
  letter-spacing: -0.02em;
  line-height: 1;
  white-space: nowrap;
  margin-left: -14px;
}

#sidebar-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--green-mist);
  border: 1px solid var(--green-pale);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  overflow: hidden;
  position: relative;
  flex-shrink: 0;
  transition: border-color 0.2s ease;
}

#sidebar-avatar:hover {
  border-color: var(--green-mid);
}

#sidebar-avatar-initials {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  color: var(--green-dark);
  line-height: 1;
  pointer-events: none;
}

/* ── Dashboard (revamped — professional, compact, content-first) ───────────── */
.dash { gap: 16px; }

.dash-topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.dash-hello {
  font-family: var(--font-heading);
  font-size: 25px;
  font-weight: 700;
  letter-spacing: -0.015em;
  color: var(--text-dark);
  margin: 0;
}
.dash-tagline { margin: 3px 0 0; font-size: 13px; color: var(--text-soft); }
.dash-typeline { margin: 7px 0 0; font-size: 15px; font-weight: 600; color: var(--green-dark); display: flex; align-items: baseline; gap: 5px; }
.dash-type-prefix { color: var(--text-mid); font-weight: 500; }
.dash-type-caret { display: inline-block; width: 2px; height: 1em; background: var(--green-mid); animation: lpCaretBlink 1s step-end infinite; align-self: center; }
@keyframes lpCaretBlink { 50% { opacity: 0; } }
.dash-topbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.dash-exam-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--white);
  border: 1px solid var(--green-pale);
  font-size: 12.5px;
  color: var(--text-soft);
}
.dash-exam-pill strong { color: var(--green-dark); font-weight: 700; }

.dash-notice { font-size: 13px; }

.dash-continue {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 14px 18px;
}
.dash-continue-kicker {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--green-mid);
}
.dash-continue-label { margin: 3px 0 0; font-size: 14px; color: var(--text-mid); }
.dash-continue-actions { margin: 0; flex-wrap: wrap; }

.dash-stats {
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(118px, 1fr));
}
.dash-stats .stat-card { padding: 12px 14px; text-align: left; }
.dash-stats .stat-card .muted { font-size: 12px; }
/* On small phones the auto-fit track collapses to a single column (4 tall cards);
   force a tidy 2×2 instead. */
@media (max-width: 520px) {
  #page-home .dash-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
/* First-run: hide the all-zero stat cards until the student has some progress. */
#page-home.is-first-run .dash-stats { display: none; }

.dash-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}
.dash-section-title {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 700;
  color: var(--text-dark);
  margin: 0;
}

@media (max-width: 640px) {
  .dash-topbar-right { width: 100%; }
}

/* (removed 2026-06-04: dead home-top-shell / profile-dock / sidebar progress-bar wrapper) */

#sidebar-rag-pct {
  font-size: 10px;
  font-weight: 800;
  color: #2f8a5b;
}

.sidebar-rag-fill {
  height: 100%;
  background: linear-gradient(90deg, #2f8a5b, #7cc49a);
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* (removed 2026-06-04: dead sidebar-rag-sub / sidebar-plant / nav-section-label / nav-divider / sidebar-group) */

.sidebar-context-card {
  margin: 8px 14px 10px;
  padding: 14px 14px 16px;
  border-radius: 6px;
  background: linear-gradient(180deg, #f3fbf4, #eef8f0);
  border: 1px solid rgba(116,198,157,0.32);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.4);
}

.sidebar-context-card h4 {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 800;
  color: var(--green-dark);
}

.sidebar-context-card p {
  margin: 0;
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-soft);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  margin: 2px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-mid);
  text-decoration: none;
  font-family: var(--font-sans);
}

.nav-item:hover,
.tab-bar button:hover,
.action-button:hover {
  background: var(--green-mist);
}

/* RAG toggles keep their own red/amber/green on hover (no green-mist blend that
   made the green rating vanish); non-active buttons just darken slightly. Cards
   no longer flip to green on hover for the same reason. */
.rag-toggle button[data-value]:not(.is-active):hover,
.progress-rag-toggle button[data-value]:not(.is-active):hover {
  filter: brightness(0.96);
}

.nav-item.active,
.nav-item.is-active,
.tab-bar button.is-active {
  background: var(--green-mist);
  color: var(--green-dark);
  font-weight: 700;
}

.nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 20px;
  flex: 0 0 auto;
}

.nav-icon svg {
  width: 18px;
  height: 18px;
}

.tab-icon svg {
  width: 20px;
  height: 20px;
}

#sidebar-restore-tab {
  display: none;
  position: fixed;
  top: 50%;
  left: 0;
  transform: translateY(-50%);
  z-index: 500;
  background: #235c43;
  color: white;
  border: none;
  border-radius: 0 8px 8px 0;
  padding: 14px 8px;
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 10px;
  letter-spacing: 1px;
  writing-mode: vertical-rl;
  text-transform: uppercase;
  box-shadow: 2px 0 12px rgba(45,106,79,0.25);
  transition: background 0.2s;
}

#sidebar-restore-tab:hover {
  background: #2f8a5b;
}

.app-main {
  margin-left: 0;
  width: 100%;
  padding: 26px clamp(16px, 3vw, 34px) 44px;
}

/* ── Top navigation bar (replaces the left sidebar; same #sidebar id) ───────── */
.topnav-brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  text-decoration: none;
}
.app-topnav .logo-wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  color: var(--green-dark);
  letter-spacing: -0.01em;
  margin: 0;
  white-space: nowrap;
}
.topnav-primary {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1 1 auto;
  min-width: 0;
}
.app-topnav .nav-item {
  margin: 0;
  padding: 8px 11px;
  font-size: 14px;
  white-space: nowrap;
}
.topnav-more { position: relative; margin-left: auto; flex: 0 0 auto; }
.topnav-more > summary {
  list-style: none;
  cursor: pointer;
  margin: 0;
  padding: 8px 11px;
  font-size: 14px;
}
.topnav-more > summary::-webkit-details-marker { display: none; }
.topnav-more[open] > summary { background: var(--green-mist); color: var(--green-dark); }
.topnav-more-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 212px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 6px;
  background: var(--white);
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  box-shadow: var(--shadow-hover);
  z-index: 200;
}
.topnav-more-menu .nav-item { width: 100%; font-size: 13.5px; }

.app-shell.sidebar-collapsed .app-main {
  margin-left: 0;
  width: 100%;
}

.mobile-header,
.tab-bar {
  display: none;
}

.page {
  display: none;
}

.page.is-active {
  display: block;
}

.page-inner {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

/* A-03: grid items default to min-width:auto, so a child with wide intrinsic
   content (e.g. the Practice topic <select> with long option labels) forces the
   whole single-column track wider than the viewport and causes document-level
   horizontal overflow at narrow widths. Let grid items shrink, and cap the
   select so long options truncate instead of widening the page. */
.page-inner > * { min-width: 0; }
.field select,
#practice-topic-filter {
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-header h2 {
  font-size: 27px;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.page-header p,
.muted {
  color: var(--text-soft);
}

.page-intro {
  margin: -4px 0 2px;
  font-size: 16px;
  line-height: 1.6;
  color: #8aa596;
}

.breadcrumbs {
  font-size: 14px;
  color: var(--text-soft);
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 12px;
}

.card {
  background: var(--white);
  border-radius: 6px;
  box-shadow: 0 10px 30px rgba(45,106,79,0.08);
  border: 1px solid rgba(116,198,157,0.18);
  padding: 22px 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card-grid {
  display: grid;
  gap: 18px;
}

.card-grid.cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.shell-section {
  display: grid;
  gap: 14px;
}

.shell-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 800;
  color: var(--green-dark);
  padding-bottom: 8px;
  border-bottom: 2px solid rgba(183,228,199,0.55);
}

.hero-banner {
  background:
    radial-gradient(circle at top right, rgba(255,255,255,0.1), transparent 32%),
    linear-gradient(135deg, #5a8f6e, var(--green-mid));
  color: var(--white);
  border-radius: 6px;
  box-shadow: 0 16px 36px rgba(45,106,79,0.14);
}

.shell-notice-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border: 1px solid rgba(244,162,97,0.55);
  border-radius: 6px;
  background: linear-gradient(180deg, #fff8e8, #fffdf6);
  color: #a8742b;
}

.shell-notice-bar p {
  margin: 0;
  line-height: 1.5;
  flex: 1 1 auto;
}

.notice-dismiss {
  border: none;
  background: transparent;
  color: rgba(168,116,43,0.72);
  width: 28px;
  height: 28px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin-left: auto;
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.notice-dismiss:hover {
  background: rgba(244,162,97,0.12);
  color: #8d6020;
}

.notice-dismiss:focus-visible {
  outline: 2px solid rgba(168,116,43,0.35);
  outline-offset: 2px;
}

/* (removed 2026-06-04: dead dashboard hero/streak styles — replaced by .dash-* in the dashboard revamp) */

.tag-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  border-radius: 999px;
  background: #eef8f0;
  border: 1px solid rgba(116,198,157,0.3);
  font-size: 12px;
  font-weight: 700;
  color: var(--green-dark);
}

.live-shell-card {
  display: grid;
  align-content: start;
  gap: 12px;
}

.shell-small-copy {
  min-height: 48px;
  line-height: 1.55;
}

.quiz-launch-button {
  justify-content: center;
  width: 100%;
  min-height: 52px;
  font-size: 17px;
  font-weight: 800;
}

.quiz-grid .live-shell-card {
  grid-template-rows: auto minmax(72px, auto) auto minmax(88px, 1fr) auto;
  gap: 10px;
  padding: 16px;
  min-height: 100%;
}

.quiz-grid .live-shell-card h3,
.quiz-grid .live-shell-card p {
  margin: 0;
}

.quiz-grid .live-shell-card h3 {
  line-height: 1.15;
}

.quiz-grid .live-shell-card .muted:not(.shell-small-copy) {
  font-size: 13px;
}

.quiz-grid .live-shell-card .shell-small-copy {
  min-height: 88px;
  line-height: 1.45;
}

.quiz-grid .quiz-launch-button {
  min-height: 48px;
  font-size: 16px;
}

.flashcard-topic-card {
  grid-template-rows: auto minmax(28px, auto) auto;
  gap: 8px;
  min-height: 100%;
  padding: 18px 20px;
}

.quiz-grid .flashcard-topic-card {
  grid-template-rows: auto minmax(18px, auto) auto;
  gap: 8px;
  padding: 18px 20px;
}

/* ── Quiz best-score badge on grid cards ──────────────────────────────────── */
.quiz-best-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--green-mid);
  background: var(--green-mist);
  border-radius: 6px;
  padding: 2px 8px;
  margin-left: 8px;
  vertical-align: middle;
}

/* ── Quiz session card ────────────────────────────────────────────────────── */
.quiz-session-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px 32px 32px;
  max-width: 680px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.quiz-session-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.quiz-topic-breadcrumb {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.quiz-q-count {
  font-size: 12px;
  font-weight: 700;
  color: var(--green-dark);
  background: var(--green-snow);
  border: 1px solid var(--green-pale);
  padding: 3px 10px;
  border-radius: 6px;
}

.quiz-progress-bar {
  height: 6px;
  background: var(--green-mist);
  border-radius: 3px;
  margin-bottom: 22px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green-mid), var(--green-light));
  border-radius: 3px;
  transition: width 0.35s ease;
}

.quiz-question-text {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text-dark);
  margin: 0 0 22px;
}

/* ── Answer options ───────────────────────────────────────────────────────── */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.quiz-option-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 13px 16px;
  background: var(--green-snow);
  border: 2px solid var(--green-pale);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  font-weight: 600;
  color: var(--text-dark);
  transition: background 0.14s, border-color 0.14s, transform 0.1s;
}

.quiz-option-btn:hover:not(:disabled) {
  background: var(--green-mist);
  border-color: var(--green-mid);
  transform: translateX(4px);
}

.quiz-opt-label {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--white);
  border: 2px solid var(--green-pale);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 800;
  color: var(--green-mid);
}

.quiz-opt-text {
  flex: 1;
  font-size: 14px;
  line-height: 1.45;
}

.quiz-option-btn:disabled {
  cursor: default;
}

.quiz-option-btn.is-correct {
  background: #dcfce7;
  border-color: #16a34a;
  color: #14532d;
}

.quiz-option-btn.is-correct .quiz-opt-label {
  background: #15803d;
  border-color: #15803d;
  color: #fff;
}

.quiz-option-btn.is-wrong {
  background: var(--red-light);
  border-color: var(--red);
  color: #7f1d1d;
}

.quiz-option-btn.is-wrong .quiz-opt-label {
  background: #bf3d38;
  border-color: #bf3d38;
  color: #fff;
}

.quiz-option-btn.is-muted {
  opacity: 0.4;
}

/* ── Feedback area ────────────────────────────────────────────────────────── */
.quiz-feedback-area {
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 4px;
  min-height: 0;
}

.quiz-feedback-area.is-correct {
  background: #dcfce7;
  border: 1px solid #86efac;
}

.quiz-feedback-area.is-wrong {
  background: var(--red-light);
  border: 1px solid #fca5a5;
}

.quiz-fb-icon {
  flex-shrink: 0;
  font-size: 17px;
  font-weight: 900;
  line-height: 1;
  margin-top: 3px;
}

.quiz-feedback-area.is-correct .quiz-fb-icon { color: #16a34a; }
.quiz-feedback-area.is-wrong   .quiz-fb-icon { color: var(--red); }

.quiz-fb-body {
  flex: 1;
  font-size: 14px;
  line-height: 1.5;
}

.quiz-fb-body strong {
  display: block;
  margin-bottom: 2px;
}

.quiz-fb-body p {
  margin: 0;
  color: var(--text-mid);
}

.quiz-next-btn {
  flex-shrink: 0;
  align-self: center;
  padding: 8px 16px;
  background: var(--green-dark);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.14s;
}

.quiz-next-btn:hover {
  background: var(--green-mid);
}

/* ── Results card ─────────────────────────────────────────────────────────── */
.quiz-results-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 40px 32px;
  max-width: 460px;
  margin: 0 auto;
  text-align: center;
  box-shadow: var(--shadow);
}

.quiz-results-ring {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: conic-gradient(var(--green-mid) calc(var(--pct, 0) * 1%), var(--green-mist) 0);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  position: relative;
}

.quiz-results-ring::after {
  content: '';
  position: absolute;
  inset: 16px;
  background: var(--white);
  border-radius: 50%;
}

.quiz-results-ring span {
  position: relative;
  z-index: 1;
  font-size: 22px;
  font-weight: 900;
  color: var(--text-dark);
}

/* A-08: explicit quiz pass/fail status (pass mark = 80%) */
.quiz-result-status {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin: 0 0 12px;
  padding: 7px 18px;
  border-radius: var(--radius-pill, 999px);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.2;
}
.quiz-result-status.is-pass {
  background: var(--green-mist, #e8f3ea);
  color: var(--green-dark, #235c43);
  border: 1px solid var(--green-light, #7cc49a);
}
.quiz-result-status.is-fail {
  background: #fdecec;
  color: #b0343f;
  border: 1px solid #e3a3a3;
}
.quiz-result-threshold {
  font-size: 11.5px;
  font-weight: 600;
  opacity: 0.85;
}
.quiz-result-threshold:empty { display: none; }

.quiz-results-msg {
  font-size: 20px;
  margin: 0 0 8px;
}

.quiz-results-score {
  font-size: 15px;
  color: var(--text-soft);
  margin: 0 0 28px;
}

.quiz-results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

@media (max-width: 600px) {
  .quiz-session-card,
  .quiz-results-card {
    padding: 20px 16px 24px;
  }
  .quiz-feedback-area {
    flex-wrap: wrap;
  }
  .quiz-next-btn {
    width: 100%;
    text-align: center;
  }
}

.flashcard-topic-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
}

.flashcard-topic-head .icon {
  font-size: 24px;
  line-height: 1;
}

.flashcard-topic-head h3 {
  margin: 0;
  min-height: 56px;
  line-height: 1.15;
}

.flashcard-topic-card .muted {
  margin: 0;
  min-height: 18px;
  font-size: 14px;
}

.flashcard-topic-button {
  justify-content: center;
  width: 100%;
  min-height: 38px;
  padding: 10px 16px;
}

.topic-card-progress {
  display: block;
  width: 100%;
  height: 10px;
  border-radius: 999px;
  background: #e4f4e7;
  overflow: hidden;
}

.topic-card-progress-fill {
  /* must be block — as an inline <span> the width:100% (set when complete) was
     ignored, so the bar never visually filled even when a topic was completed. */
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, #5e9a74, #8bc7a3);
  transition: width 280ms ease;
}

.progress-track {
  width: 100%;
  height: 12px;
  background: var(--green-mist);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green-mid), var(--green-light));
  border-radius: 999px;
}

.hero-actions,
.action-row,
.filter-row,
.rag-toggle,
.settings-actions,
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#page-topic .rag-toggle {
  gap: 0;
  width: fit-content;
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  overflow: hidden;
  background: #ffffff;
}

#page-topic .rag-toggle button {
  min-width: 120px;
  justify-content: center;
  border-radius: 0;
  border-right: 1px solid rgba(116,198,157,0.2);
  background: transparent;
  padding: 12px 20px;
}

#page-topic .rag-toggle button:last-child {
  border-right: none;
}

#page-topic .rag-toggle button:not(.is-active):hover {
  background: #e9f4ea;
  transform: none;
}

/* Active RAG state — must beat the ID-specificity transparent background above,
   otherwise the selected (e.g. Amber) button shows white text on white = blank. */
#page-topic .rag-toggle button.is-active[data-value="red"]   { background: #bf3d38; color: #fff; }
#page-topic .rag-toggle button.is-active[data-value="amber"] { background: var(--amber); color: #241b04; }
#page-topic .rag-toggle button.is-active[data-value="green"] { background: #2b7e52; color: #fff; }

#page-topic .action-row.topic-action-row {
  gap: 0;
  width: fit-content;
}

#page-topic .topic-action-button {
  min-width: 220px;
  justify-content: center;
  border-radius: 0;
  padding: 12px 22px;
}

#page-topic .topic-action-button:first-child {
  border-radius: 6px 0 0 6px;
}

#page-topic .topic-action-button:last-child {
  border-radius: 0 6px 6px 0;
}

.action-button,
.rag-toggle button,
.download-button {
  border: none;
  border-radius: 5px;
  background: var(--green-mist);
  color: var(--green-dark);
  padding: 8px 15px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 13.5px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  box-shadow: none;
}

.action-button.is-primary,
.download-button {
  background: var(--green-mid);
  color: var(--white);
}

.action-button.is-primary:hover,
.download-button:hover {
  background: var(--green-dark);
  box-shadow: 0 4px 12px rgba(64,145,108,0.4);
}

/* (removed 2026-06-04: dead .shell-home-hero continue-button override) */

.action-button:not(.is-primary):hover {
  background: var(--green-pale);
}

.action-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.topic-card,
.topic-grid-card,
.download-card,
.audio-card,
.quiz-card,
.glossary-term,
.practice-card {
  background: var(--white);
  border: 1px solid rgba(116,198,157,0.18);
  border-radius: 6px;
  box-shadow: 0 6px 18px rgba(45,106,79,0.06);
  padding: 14px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.topic-grid,
.download-grid,
.audio-grid,
.quiz-grid,
.practice-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* Core Content (Topic Hub) cards match the dashboard's image-led cards:
   4 across so all 8 content areas fit, with the illustrated coloured covers. */
#topic-hub-grid {
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.download-task-group {
  display: grid;
  gap: 14px;
}

.download-task-group + .download-task-group {
  margin-top: 20px;
}

.download-provider-group {
  display: grid;
  gap: 14px;
}

.download-provider-group + .download-provider-group {
  margin-top: 22px;
}

.download-provider-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding: 0 2px 10px;
  border-bottom: 1px solid rgba(116,198,157,0.2);
}

.download-provider-head h3 {
  margin: 0 0 4px;
  font-size: 20px;
}

.download-provider-head p {
  margin: 0;
}

.download-provider-count {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: 6px;
  background: #f6fbf7;
  border: 1px solid rgba(116,198,157,0.2);
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 700;
}

.tag-chip.is-problem-solving {
  background: #eef6d9;
  border-color: rgba(176,205,91,0.28);
  color: #557436;
}

.tag-chip.is-digital-support {
  background: #f4ecff;
  border-color: rgba(156,122,218,0.2);
  color: #7755ab;
}

.tag-chip.is-data {
  background: #eef6ff;
  border-color: rgba(96,143,222,0.22);
  color: #4f6e9b;
}

.tag-chip.is-legislation {
  background: #fff4d7;
  border-color: rgba(231,185,78,0.2);
  color: #9c7424;
}

.tag-chip.is-business {
  background: #eef3ff;
  border-color: rgba(127,154,218,0.18);
  color: #6277a0;
}

.tag-chip.is-emerging-tech {
  background: #fff0f6;
  border-color: rgba(231,134,172,0.2);
  color: #a24f73;
}

.tag-chip.is-digital-env {
  background: #ecf7ff;
  border-color: rgba(112,176,223,0.2);
  color: #47799b;
}

.tag-chip.is-cybersecurity {
  background: #ffeef5;
  border-color: rgba(226,93,141,0.2);
  color: #b14d75;
}

.download-library-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.download-library-card {
  display: grid;
  gap: 10px;
  align-content: start;
  min-height: 100%;
  padding: 16px;
  border-radius: 6px;
  box-shadow: 0 6px 18px rgba(45,106,79,0.05);
}

.download-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.download-task-chip,
.download-type-chip {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 4px 8px;
  border-radius: 5px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.download-task-chip {
  background: #f2f8f3;
  border: 1px solid rgba(116,198,157,0.18);
  color: var(--green-dark);
}

.download-type-chip {
  background: #fcf7ef;
  border: 1px solid rgba(244,162,97,0.18);
  color: #a8742b;
}

.download-library-card h4 {
  margin: 0;
  font-size: 17px;
  line-height: 1.2;
}

.download-library-card p {
  margin: 0;
  min-height: 42px;
  line-height: 1.5;
  font-size: 13px;
}

.download-library-card .download-button {
  justify-content: center;
  width: 100%;
  margin-top: 2px;
  min-height: 40px;
  padding: 9px 16px;
  border-radius: 6px;
  font-size: 13px;
}

.file-browser-section {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.file-browser-section + .file-browser-section {
  margin-top: 24px;
}

.file-browser-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding: 0 2px 10px;
  border-bottom: 1px solid rgba(116,198,157,0.22);
}

.file-browser-head h3 {
  margin: 0 0 4px;
  color: var(--green-dark);
}

.file-browser-head p {
  margin: 0;
}

.file-list,
.file-browser-stack {
  display: grid;
  gap: 8px;
}

.file-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border: 1px solid rgba(116,198,157,0.16);
  border-radius: 6px;
  background: var(--white);
  box-shadow: 0 4px 14px rgba(45,106,79,0.04);
}

.file-row-main {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.file-row-main strong {
  display: block;
  color: var(--green-dark);
  font-size: 14px;
  line-height: 1.25;
  overflow-wrap: anywhere;
}

.file-row-main span:not(.file-icon) {
  display: block;
  margin-top: 2px;
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 700;
}

.file-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: #f4faf7;
  color: var(--green-dark);
  flex-shrink: 0;
}

.file-kind {
  padding: 4px 8px;
  border-radius: 999px;
  background: #fcf7ef;
  border: 1px solid rgba(244,162,97,0.18);
  color: #9c6c25;
  font-size: 11px;
  font-weight: 800;
}

.file-row-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.file-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  padding: 6px 10px;
  border-radius: 5px;
  background: #f6fbf7;
  border: 1px solid rgba(116,198,157,0.22);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
  text-decoration: none;
}

.file-action:hover {
  background: var(--green-pale);
}

.esp-task-guide {
  display: grid;
  gap: 16px;
}

.esp-task-summary-card {
  display: grid;
  gap: 10px;
}

/* Grid items default to min-width:auto, so a white-space:pre command block would
   stretch the card past the viewport on mobile. Let items shrink so the code
   block's own overflow-x:auto scrolls instead (fixes ESP task 2 / 4a overflow). */
.esp-task-guide > *,
.esp-task-summary-card > * {
  min-width: 0;
}

.esp-task-summary-card h3 {
  margin: 0;
  color: var(--green-dark);
}

.esp-guide-block {
  padding: 18px 20px;
  border-radius: 6px;
  background: var(--white);
  border: 1px solid rgba(116,198,157,0.18);
  box-shadow: 0 6px 18px rgba(45,106,79,0.05);
}

.esp-guide-block h3 {
  margin: 0 0 10px;
  color: var(--green-dark);
}

.esp-guide-block ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-mid);
}

.esp-guide-block li {
  margin: 6px 0;
  line-height: 1.5;
}

.esp-pattern-block {
  background: #f6fbf7;
}

/* ESP command block — terminal-style, slate (clearly "this is config to type") */
.esp-codeblock {
  margin: 10px 0 4px;
  padding: 14px 16px;
  background: #1e2a3b;
  color: #d6e2f0;
  border-radius: 6px;
  border: 1px solid rgba(52,70,95,0.5);
  font-family: ui-monospace, 'Cascadia Code', 'Consolas', 'Courier New', monospace;
  font-size: 12.5px;
  line-height: 1.65;
  white-space: pre;
  overflow-x: auto;
  min-width: 0;
}
.esp-guide-block code,
.esp-figure code {
  background: var(--green-mist);
  color: var(--green-dark);
  padding: 1px 6px;
  border-radius: 5px;
  font-family: ui-monospace, 'Consolas', monospace;
  font-size: 0.9em;
}

/* ESP real-world image examples */
.esp-figure {
  margin: 16px 0;
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow);
}
.esp-figure img { display: block; width: 100%; height: auto; }
/* ESP overview cards reuse the Core Content card look; gradient cover + glyph */
.esp-card-cover { display: flex; align-items: center; justify-content: center; }
.esp-card-cover svg { width: 30px; height: 30px; opacity: 0.92; }
.esp-figure figcaption {
  padding: 11px 15px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-mid);
  border-top: 1px solid var(--green-mist);
  background: var(--green-snow);
}

.download-card strong {
  display: block;
  line-height: 1.4;
  margin-bottom: 8px;
  word-break: break-word;
}

.glossary-shell-card {
  gap: 18px;
  border-radius: 6px;
  background: linear-gradient(180deg, #f8fdf9, #f2fbf4);
  border: 1px solid rgba(116,198,157,0.28);
}

.glossary-search-field {
  margin-bottom: 0;
}

.glossary-alpha {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.glossary-alpha-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  border-radius: 6px;
  border: 1px solid rgba(116,198,157,0.35);
  background: #f8fdf9;
  color: var(--text-soft);
  font-weight: 700;
}

.glossary-alpha-chip.is-active {
  background: var(--green-dark);
  color: #fff;
}

.glossary-shell-item {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 20px;
  border-radius: 6px;
  border: 1px solid rgba(116,198,157,0.24);
  border-left: 4px solid rgba(116,198,157,0.48);
  background: linear-gradient(180deg, #ffffff, #fbfefc);
  box-shadow: 0 8px 22px rgba(45,106,79,0.05);
}

.glossary-term-head {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
}

.glossary-letter-group {
  display: grid;
  gap: 14px;
  padding: 18px 18px 16px;
  border-radius: 6px;
  border: 1px solid rgba(116,198,157,0.2);
  background: rgba(255,255,255,0.78);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.5);
}

.glossary-letter-heading {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 800;
  color: var(--green-dark);
}

.glossary-letter-heading::after {
  content: "";
  width: 40px;
  height: 3px;
  border-radius: 999px;
  background: rgba(45,106,79,0.9);
}

.glossary-letter-stack {
  display: grid;
  gap: 12px;
}

.topic-card .icon,
.topic-grid-card .icon {
  font-size: 28px;
}

/* Image-led topic cards (LifeAt-style): illustrated cover + body + status row. */
.topic-dashboard-card {
  display: flex;
  flex-direction: column;
  align-content: start;
  text-align: left;
  padding: 0;
  border: 1px solid var(--green-pale);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  cursor: pointer;
  min-height: 100%;
}

.topic-dashboard-card:hover {
  background: var(--white);
  border-color: var(--green-light);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.topic-card-cover {
  flex: 0 0 auto;
  height: 74px;
  min-height: 74px;
  position: relative;
}

.topic-card-cover svg {
  display: block;
  width: 100%;
  /* explicit height (not 100%): a percentage height collapses to 0 when the
     card is first laid out inside a display:none page and then stays collapsed,
     which left the Core Content covers blank. An explicit height never collapses. */
  height: 74px;
}

.topic-card-body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 13px 16px 10px;
  flex: 1 1 auto;
}

.topic-card-area {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-soft);
}

.topic-card-title {
  font-family: var(--font-heading);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-dark);
  margin: 0;
}

.topic-card-summary {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-soft);
}

.topic-card-status {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px 14px;
}

.topic-card-status .topic-card-progress {
  flex: 1 1 auto;
  height: 6px;
}

.topic-card-statusrow {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-soft);
  white-space: normal;
}

.topic-status-dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #c5cdd0;
}

.topic-status-dot.rag-red { background: var(--red); }
.topic-status-dot.rag-amber { background: var(--amber); }
.topic-status-dot.rag-green { background: var(--green-mid); }

/* Topic/study page cover header (matches the topic-card covers). */
.topic-cover {
  height: 116px;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 6px;
  border: 1px solid var(--green-pale);
}
.topic-cover svg { display: block; width: 100%; height: 100%; }
.topic-cover:empty { display: none; }

/* Topic page: title-on-banner hero + compact controls (greet with the topic). */
.topic-page-inner { max-width: 1240px; }

.topic-hero {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  /* slimmer banner so the learning content sits higher on the page */
  min-height: 88px;
  display: flex;
  align-items: flex-end;
  padding: 14px 22px;
  margin-bottom: 14px;
  color: #fff;
  /* per-topic accent (set on #page-topic[data-topic]); slate-blue default */
  background: linear-gradient(135deg, var(--topic-dark, #1e2a3b) 0%, var(--topic-mid, #34465f) 100%);
}

/* Each content area gets its own muted, professional accent so topics don't all
   feel identical (kept dark + low-key, never loud). */
#page-topic[data-topic="coding"]          { --topic-dark:#1e2a3b; --topic-mid:#35507a; } /* blue */
#page-topic[data-topic="digital-support"] { --topic-dark:#14302f; --topic-mid:#2c5c5a; } /* teal */
#page-topic[data-topic="data"]            { --topic-dark:#1d2342; --topic-mid:#3a4a86; } /* indigo */
#page-topic[data-topic="legislation"]     { --topic-dark:#2b2438; --topic-mid:#4d4063; } /* plum */
#page-topic[data-topic="business"]        { --topic-dark:#2c271d; --topic-mid:#574b34; } /* bronze */
#page-topic[data-topic="emerging-tech"]   { --topic-dark:#241d39; --topic-mid:#463a66; } /* violet */
#page-topic[data-topic="digital-env"]     { --topic-dark:#16302a; --topic-mid:#2c5648; } /* deep teal-green */
#page-topic[data-topic="cybersecurity"]   { --topic-dark:#1f262e; --topic-mid:#3a4a5a; } /* steel */
/* faint per-topic colour wash behind the top of the page (ties the hero to the
   content without hurting readability — sits over the slate grid) */
#page-topic[data-topic] {
  background: linear-gradient(180deg, color-mix(in srgb, var(--topic-mid, transparent) 7%, transparent) 0%, transparent 360px);
}
.topic-hero .topic-cover {
  position: absolute;
  inset: 0;
  height: 100%;
  margin: 0;
  border: 0;
  border-radius: 0;
}
.topic-hero .topic-cover svg { width: 100%; height: 100%; }
/* the per-topic illustrated cover becomes a faint texture over the slate base */
.topic-hero .topic-cover { opacity: 0.18; }
.topic-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(140deg, rgba(20,30,46,0.30) 0%, rgba(20,30,46,0.72) 100%);
}
.topic-hero-content { position: relative; z-index: 1; max-width: 70ch; }
.topic-hero-crumbs { color: rgba(255,255,255,0.82); font-size: 12.5px; }
.topic-hero-crumbs span { color: rgba(255,255,255,0.82); }
.topic-hero-crumbs span:first-child { cursor: pointer; }
.topic-hero h1 {
  color: #fff;
  font-size: 25px;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 3px 0 3px;
}
.topic-hero-summary {
  color: rgba(255,255,255,0.92);
  font-size: 13.5px;
  line-height: 1.5;
  margin: 0;
}
.topic-hero-back {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 2;
  background: rgba(255,255,255,0.92);
  color: #1e2a3b;
}
.topic-hero-back:hover { background: #fff; }

.topic-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 10px 14px;
  margin-bottom: 14px;
  background: var(--white);
  border: 1px solid var(--green-pale);
  border-radius: var(--radius);
}
.topic-controls-bar .action-row { margin: 0; }

/* Lesson stats strip (read time, subtopics, flashcards, quiz, practice) */
.topic-stats-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.topic-stats-strip:empty { display: none; }

/* ── Donate button (top nav, coffee accent) ── */
.topnav-donate {
  margin-left: auto;
  border: 1px solid rgba(201,138,46,0.45);
  border-radius: 999px;
  color: #a96f1f;
}
.topnav-donate:hover { background: var(--amber-light, #fdf2e0); color: #8a5e16; }
.topnav-donate .nav-icon { color: #c98a2e; }

/* A-04: between the mobile tab-bar breakpoint (<=760px) and full desktop, the
   nine top-nav items overflow the viewport (the full set only fits >=~1280px).
   Collapse the three lower-priority routes into the "More" dropdown and tighten
   the remaining bar so every route stays reachable with no document overflow.
   The duplicated links live in the menu as .topnav-more-extra (hidden on wide
   desktop so they are not shown twice). */
.topnav-more-extra { display: none; }
@media (min-width: 761px) and (max-width: 1300px) {
  .topnav-primary > .topnav-collapsible { display: none; }
  .topnav-more-menu .topnav-more-extra { display: flex; }
  .topnav-primary > .nav-item > .nav-icon,
  .topnav-primary > .topnav-more > summary > .nav-icon { display: none; }
  .app-topnav .nav-item,
  .topnav-more > summary { padding: 8px 9px; }
  .app-topnav .logo-wordmark { font-size: 18px; }
}

/* A-02: visible keyboard focus for the now keyboard-operable topic launch cards */
.topic-dashboard-card:focus-visible {
  outline: 3px solid var(--green-mid);
  outline-offset: 2px;
}

/* ── "Coming soon" / support pages ── */
.coming-soon {
  max-width: 560px;
  margin: 40px auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 13px;
  padding: 46px 36px;
}
.coming-soon-icon {
  width: 58px; height: 58px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 6px;
  background: var(--green-mist);
  color: var(--green-dark);
}
.coming-soon-icon svg { width: 30px; height: 30px; }
.coming-soon-badge {
  font-size: 11px; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--green-dark); background: var(--green-mist);
  padding: 4px 12px; border-radius: 999px;
}
.coming-soon h2 { margin: 4px 0 0; }
.coming-soon .muted { max-width: 46ch; line-height: 1.6; }
.coming-soon .action-button { margin-top: 6px; }
.donate-icon { background: var(--amber-light, #fdf2e0); color: #b9772a; }
.donate-cta { background: #c98a2e; }
.donate-cta:hover { background: #a96f1f; }
.donate-paypal { width: 100%; max-width: 360px; margin: 6px auto 0; min-height: 50px; }

/* ── Back-to-top button (appears on scroll) ── */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 1100;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(52,70,95,0.18);
  border-radius: 50%;
  background: #34465f;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(30,42,59,0.28);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease, background 0.15s ease;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: #1e2a3b; }
.back-to-top svg { width: 20px; height: 20px; }
@media (max-width: 760px) {
  .back-to-top { bottom: calc(var(--tabbar-h, 64px) + 14px); right: 16px; }
}
.topic-stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 13px;
  border-radius: 999px;
  background: var(--green-mist);
  border: 1px solid var(--green-pale);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--green-dark);
}
.topic-stat-icon { font-size: 13px; line-height: 1; color: var(--green-mid); }

/* On-brand SVG diagrams (filled into .diagram-slot by diagrams.js) */
.diagram-slot.has-diagram {
  background: none;
  border: 0;
  padding: 0;
  display: block;
}
.topic-diagram {
  margin: 16px 0;
  padding: 16px 18px;
  background: linear-gradient(180deg, #ffffff, #f7faf3);
  border: 1px solid var(--green-pale);
  border-radius: var(--radius);
}
.topic-diagram svg { display: block; width: 100%; height: auto; max-height: 260px; }
/* near-square diagrams (e.g. a risk matrix) center at a readable size instead of
   stretching full-width with large side gaps */
.topic-diagram--compact { max-width: 480px; margin-left: auto; margin-right: auto; }
.topic-diagram--compact svg { max-height: 380px; }
.topic-diagram figcaption {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px solid var(--green-mist);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text-mid);
}

/* "Going deeper" context callouts (added contextual depth, professional tone) */
.topic-context-callout {
  margin: 16px 0;
  padding: 12px 16px;
  background: var(--green-mist);
  border-left: 3px solid var(--green-mid);
  border-radius: 0 8px 8px 0;
}
.topic-context-kicker {
  display: block;
  margin-bottom: 5px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--green-dark);
}
.topic-context-callout p { margin: 0; font-size: 14px; line-height: 1.62; color: var(--text-mid); }

/* ── Reusable learning blocks (Core idea / Exam angle / Common mistake / Answer / Quick check) ── */
.learning-blocks { display: grid; gap: 12px; margin-top: 20px; }
.learning-block {
  border: 1px solid var(--green-pale);
  border-left: 5px solid var(--green-mid);
  background: #f4fbf7;
  border-radius: 6px;
  padding: 14px 16px;
}
.learning-block p { margin: 0; font-size: 14px; line-height: 1.7; color: var(--text-mid); }
.lb-kicker {
  display: block;
  margin-bottom: 5px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.lb-core { border-left-color: var(--green-mid); }
.lb-core .lb-kicker { color: var(--green-dark); }
.lb-exam { border-left-color: #3a5a8c; background: #f2f6fc; }
.lb-exam .lb-kicker { color: #2f4f86; }
.lb-mistake { border-left-color: var(--amber); background: #fdf6ea; }
.lb-mistake .lb-kicker { color: #8a5e16; }
.lb-answer { border-left-color: var(--green-dark); background: #eef7f1; }
.lb-answer .lb-kicker { color: var(--green-dark); }
/* Quick check — native <details> reveal */
.lb-quickcheck {
  border: 1px solid var(--green-pale);
  border-left: 5px solid #6b4fa0;
  background: #f6f3fb;
  border-radius: 6px;
}
.lb-quickcheck summary { list-style: none; cursor: pointer; padding: 14px 16px; }
.lb-quickcheck summary::-webkit-details-marker { display: none; }
.lb-quickcheck .lb-kicker { color: #5a3fa0; }
.lb-quickcheck .lb-q { display: block; font-size: 14px; font-weight: 600; line-height: 1.6; color: var(--text-dark); }
.lb-quickcheck summary::after {
  content: "Reveal answer \25B8";
  display: inline-block;
  margin-top: 8px;
  font-size: 11.5px;
  font-weight: 700;
  color: #5a3fa0;
}
.lb-quickcheck[open] summary::after { content: "Hide answer \25BE"; }
.lb-quickcheck:not([open]) .lb-answer-reveal { display: none; }
.lb-answer-reveal { padding: 0 16px 14px; font-size: 14px; line-height: 1.7; color: var(--text-mid); }
body.theme-dark .learning-block,
body.theme-dark .lb-quickcheck { background: #2a2c31; border-color: rgba(255,255,255,0.08); }

/* ── Hoverable/tappable comparison cards ── */
.compare-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
}
.compare-card {
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  background: #fff;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.compare-card:hover { border-color: var(--green-light); box-shadow: 0 8px 20px rgba(35,76,57,0.08); transform: translateY(-1px); }
.compare-card[open] { border-color: var(--green-mid); grid-column: 1 / -1; }
.compare-card summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.compare-card summary::-webkit-details-marker { display: none; }
.compare-card-name { font-size: 14px; font-weight: 800; color: var(--green-dark); }
.compare-card-purpose { font-size: 11.5px; color: var(--text-soft); }
.compare-card summary::after {
  content: "Compare \25B8";
  margin-top: 6px;
  font-size: 10.5px;
  font-weight: 700;
  color: var(--green-mid);
}
.compare-card[open] summary::after { content: "Close \25BE"; }
.compare-card:not([open]) .compare-card-body { display: none; }
.compare-card-body { padding: 0 14px 13px; display: grid; gap: 7px; }
.compare-card-body p { margin: 0; font-size: 13px; line-height: 1.6; color: var(--text-mid); }
.compare-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 1px 7px;
  border-radius: 999px;
  margin-right: 4px;
}
.compare-tag-good { background: var(--green-mist); color: var(--green-dark); }
.compare-tag-bad { background: #fdf6ea; color: #8a5e16; }
.compare-tag-exam { background: #f2f6fc; color: #2f4f86; }
.compare-exam { border-top: 1px dashed var(--green-pale); padding-top: 7px; }
body.theme-dark .compare-card { background: #2a2c31; border-color: rgba(255,255,255,0.08); }

/* Compact anonymous "online now" indicator (replaces the named live-users list). */
.shell-online-strip { display: flex; }
.shell-online-strip .lu-count-bar {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: auto;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--white);
  border: 1px solid var(--green-pale);
  font-size: 12.5px;
  color: var(--text-soft);
}
.shell-online-strip .lu-count-badge { font-weight: 700; color: var(--green-dark); }
.lu-online-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green-mid);
  box-shadow: 0 0 0 3px rgba(47,138,91,0.16);
}

.completion-summary {
  display: grid;
  gap: 8px;
}

.qotd-live-card {
  display: grid;
  gap: 18px;
}

.qotd-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.qotd-option-list {
  display: grid;
  gap: 14px;
}

.qotd-option-button {
  width: 100%;
  text-align: left;
  border-radius: 5px;
  border: 2px solid var(--green-pale);
  background: #ffffff;
  color: var(--text-dark);
  padding: 10px 14px;
  font-size: 13px;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
}

.qotd-option-button:hover:not(:disabled) {
  border-color: var(--green-mid);
  background: var(--green-snow);
}

/* QOTD answered states */
.qotd-opt-correct {
  border-color: var(--green-mid) !important;
  background: var(--green-mist) !important;
  color: var(--green-dark) !important;
  font-weight: 800;
  cursor: default;
}

.qotd-opt-disabled {
  border-color: var(--green-pale);
  background: #fafafa;
  color: #b0b0b0;
  cursor: default;
  opacity: 0.7;
}

.qotd-option-button:disabled {
  cursor: default;
}

/* QOTD feedback box */
.qotd-feedback {
  font-size: 13px;
  line-height: 1.6;
  min-height: 0;
}

.qotd-feedback-correct {
  background: var(--green-mist);
  border-left: 3px solid var(--green-mid);
  border-radius: 6px;
  padding: 10px 14px;
  color: var(--green-dark);
  font-weight: 600;
}

.qotd-feedback-wrong {
  background: var(--red-light);
  border-left: 3px solid var(--red);
  border-radius: 6px;
  padding: 10px 14px;
  color: #7a1922;
  font-weight: 600;
}

/* QOTD completed badge */
.qotd-done-badge {
  display: inline-block;
  margin-left: 10px;
  background: var(--green-mist);
  color: var(--green-dark);
  font-size: 11px;
  font-weight: 700;
  border-radius: 6px;
  padding: 2px 10px;
  vertical-align: middle;
}

/* QOTD question text */
.qotd-question-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.5;
  margin: 0;
}

.content-placeholder,
.empty-state {
  background: linear-gradient(180deg, #f7faf3, #f3f6f0);
  border: 1px dashed var(--green-light);
  border-radius: 6px;
  color: var(--text-mid);
  padding: 18px;
}

.topic-learning-shell {
  display: grid;
  gap: 18px;
}

.topic-learning-hero,
.topic-checklist-card,
.topic-navigation-panel {
  padding: 22px 24px;
}

.topic-learning-hero {
  display: grid;
  gap: 12px;
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(243,251,244,0.96));
}

.topic-learning-eyebrow,
.topic-diagram-eyebrow,
.topic-highlight-eyebrow {
  margin: 0;
  color: var(--green-mid);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topic-learning-hero h3,
.topic-diagram-placeholder h3,
.topic-learning-section h3,
.topic-highlight-card h3,
.topic-checklist-card h3,
.topic-navigation-panel h3 {
  margin: 0;
}

.topic-learning-hero p,
.topic-diagram-placeholder p,
.topic-learning-section p,
.topic-highlight-card p,
.topic-checklist-card p,
.topic-navigation-panel p {
  margin: 0;
}

.topic-section-map {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.topic-section-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--green-snow);
  border: 1px solid rgba(116,198,157,0.24);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 700;
}

.topic-highlight-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.topic-highlight-card {
  display: grid;
  gap: 10px;
  padding: 18px 20px;
}

.topic-learning-stack {
  display: grid;
  gap: 16px;
}

.topic-learning-section {
  display: grid;
  gap: 14px;
  padding: 20px 22px;
}

.topic-learning-section-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.topic-section-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 62px;
  padding: 6px 10px;
  border-radius: 999px;
  background: #e9f4ea;
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
}

.topic-learning-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: var(--text-mid);
}

.topic-diagram-placeholder {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1.25fr) minmax(220px, 0.75fr);
  align-items: center;
  padding: 20px 22px;
  background: linear-gradient(135deg, rgba(238,249,240,0.96), rgba(246,252,247,0.98));
}

.topic-diagram-copy {
  display: grid;
  gap: 10px;
}

.topic-diagram-frame {
  min-height: 190px;
  display: grid;
  place-items: center;
  gap: 10px;
  text-align: center;
  border-radius: 6px;
  border: 1px dashed rgba(45,106,79,0.28);
  background: rgba(255,255,255,0.84);
  color: var(--text-soft);
  padding: 18px;
}

.topic-diagram-icon {
  font-size: 34px;
  line-height: 1;
}

.topic-navigation-panel {
  display: grid;
  gap: 14px;
}

.topic-navigation-copy {
  display: grid;
  gap: 8px;
}

.topic-navigation-row {
  gap: 10px;
}

.topic-navigation-button {
  justify-content: center;
}

.topic-document-shell {
  display: grid;
  gap: 30px;
  padding: 40px 56px 46px;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.2);
  background: linear-gradient(180deg, rgba(255,255,255,0.99), rgba(249,253,250,0.98));
  box-shadow: 0 18px 44px rgba(35, 76, 57, 0.08);
  position: relative;
  overflow: hidden;
}
/* soft per-topic glow inside the content card (adds depth, stays subtle) */
.topic-document-shell::before {
  content: "";
  position: absolute;
  top: -90px;
  right: -90px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, color-mix(in srgb, var(--topic-mid, #2f8a5b) 13%, transparent), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.topic-document-shell > * { position: relative; z-index: 1; }

.topic-document-intro {
  display: grid;
  gap: 14px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(116, 198, 157, 0.22);
}

.topic-document-kicker {
  margin: 0;
  color: var(--green-mid);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topic-document-breadcrumb {
  margin: 0;
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.6;
}

.topic-document-breadcrumb span {
  color: var(--green-light);
  padding: 0 6px;
}

.topic-document-title {
  margin: 0;
  color: var(--green-dark);
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.topic-document-subtitle {
  margin: 0;
  color: var(--green-mid);
  font-size: 14px;
  font-weight: 700;
}

.topic-document-lead {
  margin: 0;
  max-width: 72ch;
  color: var(--text-mid);
  font-size: 18px;
  line-height: 1.78;
}

.topic-document-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topic-document-chip,
.topic-document-chip-link,
.topic-doc-source-more {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(116, 198, 157, 0.24);
  background: var(--green-snow);
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
}

.topic-document-chip {
  padding: 8px 14px;
}

.topic-document-chip-link,
.topic-doc-source-more {
  padding: 8px 14px;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.topic-document-chip-link:hover,
.topic-document-chip-link:focus-visible,
.topic-doc-source-more:hover,
.topic-doc-source-more:focus-visible {
  transform: translateY(-1px);
  background: #eaf7ed;
  border-color: rgba(45, 106, 79, 0.26);
  color: var(--green-dark);
  outline: none;
}

.topic-document-diagram {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
  align-items: stretch;
  padding: 24px 26px;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.2);
  background: linear-gradient(135deg, rgba(241, 250, 243, 0.96), rgba(249, 253, 250, 0.98));
}

.topic-document-diagram-copy {
  display: grid;
  gap: 12px;
}

.topic-document-diagram-copy h3,
.topic-document-reference-title h2 {
  margin: 0;
}

.topic-document-diagram-copy p {
  margin: 0;
  color: var(--text-mid);
  line-height: 1.72;
}

.topic-document-diagram-frame {
  min-height: 220px;
  display: grid;
  place-items: center;
  gap: 12px;
  padding: 22px;
  text-align: center;
  border-radius: 6px;
  border: 1px dashed rgba(45, 106, 79, 0.24);
  background: rgba(255,255,255,0.9);
  color: var(--text-soft);
}

.topic-document-diagram-frame p {
  margin: 0;
}

.topic-document-diagram-icon {
  font-size: 34px;
  line-height: 1;
}

.topic-document-body {
  display: grid;
  gap: 28px;
}

.topic-document-section {
  display: grid;
  gap: 18px;
  padding-top: 28px;
  border-top: 1px solid rgba(116, 198, 157, 0.18);
}

.topic-document-body .topic-document-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.topic-document-section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.topic-document-section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.topic-document-section-title h2 {
  margin: 0;
  color: var(--green-dark);
  font-size: 28px;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.topic-document-section-body {
  display: grid;
  gap: 16px;
}

.topic-document-section-body h3,
.topic-document-section-body h4 {
  margin: 10px 0 0;
  color: var(--green-dark);
}

.topic-document-section-body h3 {
  font-size: 21px;
  line-height: 1.3;
}

.topic-document-section-body h4 {
  font-size: 17px;
  line-height: 1.35;
}

.topic-document-section-body p {
  margin: 0;
  color: var(--text-mid);
  line-height: 1.8;
}

.topic-document-section-body strong {
  color: var(--green-dark);
}

.topic-document-section-body code {
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(45, 106, 79, 0.08);
  color: var(--green-dark);
  font-family: var(--font-mono);
  font-size: 0.92em;
}

.topic-document-list {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 10px;
  color: var(--text-mid);
}

.topic-document-list-numbered {
  padding-left: 24px;
}

.topic-document-list li {
  line-height: 1.74;
}

.topic-document-table-wrap {
  overflow-x: auto;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.2);
  background: #fff;
}

.topic-document-table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
}

.topic-document-table th,
.topic-document-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(116, 198, 157, 0.16);
  text-align: left;
  vertical-align: top;
}

.topic-document-table th {
  background: rgba(241, 250, 243, 0.92);
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.topic-document-table td {
  color: var(--text-mid);
  line-height: 1.72;
}

.topic-document-table tbody tr:last-child td {
  border-bottom: 0;
}

.topic-doc-source-strip {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.topic-doc-source-label {
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topic-doc-source-icon {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(116, 198, 157, 0.22);
  background: var(--green-snow);
  color: var(--green-dark);
  text-decoration: none;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.topic-doc-source-icon:hover,
.topic-doc-source-icon:focus-visible {
  transform: translateY(-1px);
  background: #eaf7ed;
  border-color: rgba(45, 106, 79, 0.26);
  outline: none;
}

.topic-document-references {
  display: grid;
  gap: 20px;
  padding-top: 30px;
  border-top: 1px solid rgba(116, 198, 157, 0.2);
}

.topic-document-reference-lead {
  margin: 0;
  color: var(--text-mid);
  line-height: 1.76;
}

.topic-reference-groups {
  display: grid;
  gap: 22px;
}

.topic-reference-group {
  display: grid;
  gap: 16px;
  padding: 22px 24px;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.18);
  background: linear-gradient(180deg, rgba(255,255,255,0.98), rgba(246,252,247,0.95));
}

.topic-reference-group-head {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.topic-reference-group-head h3 {
  margin: 0;
}

.topic-reference-list {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 12px;
}

.topic-reference-item {
  display: grid;
  gap: 4px;
}

.topic-reference-link {
  color: var(--green-dark);
  font-weight: 700;
  text-decoration: none;
}

.topic-reference-link:hover,
.topic-reference-link:focus-visible {
  text-decoration: underline;
  outline: none;
}

.topic-reference-host,
.topic-reference-spec,
.topic-reference-note {
  color: var(--text-soft);
  font-size: 13px;
  line-height: 1.6;
}

.topic-navigation-panel {
  display: grid;
  gap: 18px;
  padding: 24px 26px;
  border: 1px solid rgba(116, 198, 157, 0.2);
  background: linear-gradient(180deg, rgba(248,252,249,0.98), rgba(241,250,243,0.92));
}

.topic-navigation-summary {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.topic-navigation-block {
  display: grid;
  gap: 4px;
  padding: 16px 18px;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.18);
  background: rgba(255,255,255,0.78);
}

.topic-navigation-label {
  color: var(--text-soft);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.topic-navigation-value {
  color: var(--green-dark);
  font-size: 18px;
  line-height: 1.3;
}

.topic-navigation-note {
  color: var(--text-mid);
  font-size: 14px;
  line-height: 1.55;
}

.rag-toggle button[data-value="red"].is-active {
  background: #bf3d38;
  color: #fff;
  box-shadow: 0 10px 20px rgba(225,79,106,0.2);
}

.rag-toggle button[data-value="amber"].is-active {
  background: var(--amber);
  color: #241b04;
  box-shadow: 0 10px 20px rgba(209,138,12,0.18);
}

.rag-toggle button[data-value="green"].is-active {
  background: #2b7e52;
  color: #fff;
  box-shadow: 0 10px 20px rgba(60,154,105,0.18);
}

.rag-toggle button[data-value="red"],
.progress-rag-toggle button[data-value="red"] {
  background: #ffffff;
  color: #b0343f;
  border: 1px solid rgba(217,83,79,0.30);
}

.rag-toggle button[data-value="amber"],
.progress-rag-toggle button[data-value="amber"] {
  background: #ffffff;
  color: #8a5e16;
  border: 1px solid rgba(224,162,60,0.34);
}

.rag-toggle button[data-value="green"],
.progress-rag-toggle button[data-value="green"] {
  background: #ffffff;
  color: #1f6e45;
  border: 1px solid rgba(47,138,91,0.32);
}

.rag-toggle button[data-value],
.progress-rag-toggle button[data-value] {
  gap: 9px;
  letter-spacing: 0.01em;
  font-weight: 700;
  box-shadow: none;
}

.rag-toggle button[data-value]::before,
.progress-rag-toggle button[data-value]::before {
  content: "\25CF";
  font-size: 11px;
  line-height: 1;
}

.rag-toggle button[data-value="red"]::before,
.progress-rag-toggle button[data-value="red"]::before {
  color: #d9534f;
}

.rag-toggle button[data-value="amber"]::before,
.progress-rag-toggle button[data-value="amber"]::before {
  color: #d99a2b;
}

.rag-toggle button[data-value="green"]::before,
.progress-rag-toggle button[data-value="green"]::before {
  color: #2f8a5b;
}

.rag-toggle button[data-value="red"].is-active::before,
.progress-rag-toggle button[data-value="red"].is-active::before,
.rag-toggle button[data-value="amber"].is-active::before,
.progress-rag-toggle button[data-value="amber"].is-active::before,
.rag-toggle button[data-value="green"].is-active::before,
.progress-rag-toggle button[data-value="green"].is-active::before {
  color: currentColor;
}

.stat-row {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.stat-card strong {
  display: block;
  font-size: 21px;
}

.live-users-list {
  display: grid;
  gap: 12px;
}

.live-users-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

/* ── Live Users: count bar + avatar rows ──────────────────────────────────── */
.lu-count-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 0 10px;
  border-bottom: 1px solid rgba(116,198,157,0.2);
  margin-bottom: 4px;
}

.lu-count-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-mid, #555);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.lu-count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 8px;
  border-radius: 6px;
  background: var(--green-mid, #7cc49a);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
}

.lu-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
}

.lu-avatar {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
}

.lu-avatar-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
}

.lu-avatar-initials {
  background: var(--green-dark, #235c43);
  color: #fff;
  user-select: none;
}

.lu-info {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.lu-name {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-dark, #1a2e1a);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lu-status {
  font-size: 0.74rem;
  color: var(--green-mid, #7cc49a);
  font-weight: 500;
}

.lu-pts {
  font-size: 0.78rem;
  color: var(--text-mid, #555);
  white-space: nowrap;
}

.lu-empty {
  font-size: 0.85rem;
  color: var(--text-mid, #777);
  margin: 6px 0 0;
  padding: 0;
}

.glossary-list {
  display: grid;
  gap: 18px;
}

.glossary-term {
  display: grid;
  gap: 10px;
  padding: 16px 18px;
  border-radius: 6px;
  border: 1px solid rgba(116,198,157,0.28);
  background: #ffffff;
  box-shadow: 0 8px 22px rgba(45,106,79,0.04);
  transition: border-color 120ms ease, box-shadow 120ms ease, transform 120ms ease;
}

.glossary-term:hover {
  border-color: rgba(116,198,157,0.42);
  box-shadow: 0 12px 26px rgba(45,106,79,0.07);
  transform: translateY(-1px);
}

.progress-shell-card {
  display: grid;
  gap: 18px;
}

.progress-tab-row {
  display: inline-flex;
  align-items: center;
  gap: 0;
  padding: 4px;
  border-radius: 6px;
  background: #dff4e0;
  width: fit-content;
}

.progress-tab-chip {
  border: 0;
  background: transparent;
  color: var(--text-soft);
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 800;
  font-family: var(--font-sans);
  cursor: pointer;
}

.progress-tab-chip.is-active {
  background: #fff;
  color: var(--green-dark);
  box-shadow: 0 4px 14px rgba(45,106,79,0.08);
}

.progress-page-intro {
  margin: 0;
}

.progress-rag-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-radius: 6px;
  background: #fff;
  border: 1px solid rgba(116,198,157,0.22);
}

.progress-legend-chip,
.progress-status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 84px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
}

.progress-legend-chip.is-red,
.progress-status-pill.is-red {
  background: #ffe7ee;
  color: #d9534f;
}

.progress-legend-chip.is-amber,
.progress-status-pill.is-amber {
  background: #fff3dc;
  color: #d99a2b;
}

.progress-legend-chip.is-green,
.progress-status-pill.is-green {
  background: #e5f7e8;
  color: #2f8a5b;
}

.progress-status-pill {
  min-width: 120px;
  background: #eef2f0;
  color: var(--text-soft);
}

.progress-status-pill.is-complete {
  background: #e5f7e8;
  color: #2c8559;
}

.progress-overview-card {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 18px 22px;
  border-radius: 6px;
  border: 1px solid rgba(116,198,157,0.38);
  background: radial-gradient(circle at center, rgba(255,255,255,0.8), rgba(234,249,238,0.95));
}

.progress-overview-ring {
  width: 66px;
  height: 66px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 5px solid rgba(116,198,157,0.26);
  color: var(--green-dark);
  background: rgba(255,255,255,0.9);
}

.progress-overview-ring strong {
  font-size: 20px;
  line-height: 1;
}

.progress-overview-copy {
  display: grid;
  gap: 8px;
}

.progress-overview-copy h3 {
  margin: 0;
  font-size: 18px;
}

.progress-overview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.progress-meta-count {
  font-size: 13px;
  font-weight: 700;
}

.progress-meta-count.is-green { color: #2fa17a; }
.progress-meta-count.is-amber { color: #d19c2d; }
.progress-meta-count.is-red { color: #df4f65; }
.progress-meta-count.is-unset { color: #b8b1ca; }

.progress-shell-list {
  display: grid;
  gap: 12px;
}

.progress-topic-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 22px;
  border-radius: 6px;
  background: #fff;
  border: 1px solid rgba(116,198,157,0.2);
  box-shadow: 0 8px 22px rgba(45,106,79,0.04);
}

.progress-topic-label {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: var(--green-dark);
}

.progress-topic-label strong {
  font-size: 14px;
}

.progress-topic-icon {
  font-size: 18px;
  line-height: 1;
}

.progress-rag-toggle {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  background: transparent;
  border: 0;
  padding: 0;
}

.progress-rag-toggle button {
  min-width: 126px;
  min-height: 46px;
  border-radius: 999px !important;
  padding-inline: 20px;
}

.progress-topic-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.progress-inline-button {
  min-height: 40px;
  padding: 10px 18px;
}

.question-shell,
.flashcard-shell {
  display: grid;
  gap: 14px;
}

.flashcard-session {
  display: grid;
  gap: 18px;
}

.flashcard-session-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.flashcard-session-chip {
  min-height: 38px;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid rgba(116,198,157,0.2);
  background: #f4fbf6;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

button.flashcard-session-chip {
  cursor: pointer;
}

.flashcard-session-stage {
  display: grid;
  place-items: center;
}

.flashcard-stage-card {
  width: min(760px, 100%);
  min-height: 380px;
  padding: 44px 42px;
  border-radius: 6px;
  display: grid;
  align-items: center;
  justify-items: center;
  gap: 18px;
  background: linear-gradient(140deg, #4a946b, #2f6f4d);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.18);
  box-shadow: 0 20px 44px rgba(45,106,79,0.14);
  text-align: center;
  cursor: pointer;
}

.flashcard-stage-card.is-revealed {
  background: linear-gradient(180deg, #ffffff, #f6faf3);
  color: var(--text-mid);
  border: 1px solid rgba(116,198,157,0.22);
  cursor: default;
}

.flashcard-stage-eyebrow {
  margin: 0;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 14px;
  font-weight: 800;
  opacity: 0.82;
}

.flashcard-stage-body {
  display: grid;
  gap: 14px;
  max-width: 620px;
}

.flashcard-stage-body h3 {
  margin: 0;
  font-size: clamp(28px, 3.2vw, 40px);
  line-height: 1.2;
  font-weight: 900;
}

.flashcard-stage-body p {
  margin: 0;
  font-size: 17px;
  line-height: 1.65;
}

.flashcard-session-footer {
  display: grid;
  justify-items: center;
  gap: 12px;
}

.flashcard-session-counter {
  margin: 0;
  color: var(--text-soft);
  font-size: 15px;
  font-weight: 700;
}

.flashcard-session-actions {
  justify-content: center;
}

.flashcard-session-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: center;
  padding: 18px 24px;
  border-radius: 6px;
  border: 1px solid rgba(116,198,157,0.18);
  background: linear-gradient(180deg, #f6faf3, #eef3ec);
}

.flashcard-stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-mid);
  font-size: 16px;
  font-weight: 700;
}

.flashcard-stat-chip.is-correct {
  color: var(--green-dark);
}

.flashcard-stat-chip.is-retry {
  color: #b45555;
}

.flashcard-prompt-card {
  padding: 24px 26px;
}

.flashcard-prompt-card h4 {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 900;
}

.flashcard-prompt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.flashcard-prompt-chip {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid rgba(116,198,157,0.22);
  background: #fbfefb;
  color: var(--green-dark);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.4;
}

/* ── Flashcard colour fixes ──────────────────────────────────────────────────
   The generic .card:hover rule sets background: var(--green-mist) which
   overwrites the question card's dark-green gradient, leaving white text
   invisible on a light mint background.  Override it here for both states.
   ─────────────────────────────────────────────────────────────────────────── */

/* Question card — keep dark gradient on hover; text stays white */
.flashcard-stage-card:not(.is-revealed):hover {
  background: linear-gradient(140deg, #559b74, #386b4a);
  color: #fff;
}

/* Muted / hint text inside the question card must be light not dark-green */
.flashcard-stage-card .muted,
.flashcard-stage-card .flashcard-hint {
  color: rgba(255, 255, 255, 0.72) !important;
}

/* Hint paragraph styling (shown before the card is flipped) */
.flashcard-hint {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  font-style: italic;
  color: rgba(255, 255, 255, 0.72);
}

/* Revealed / answer card — keep white background on hover; no lift (cursor:default) */
.flashcard-stage-card.is-revealed:hover {
  background: linear-gradient(180deg, #ffffff, #f6faf3);
  transform: none;
  box-shadow: 0 20px 44px rgba(45, 106, 79, 0.14);
}

/* Eyebrow label on the revealed card — use brand green rather than opaque grey */
.flashcard-stage-card.is-revealed .flashcard-stage-eyebrow {
  color: var(--green-mid);
  opacity: 1;
}

.esp-hero-card {
  position: relative;
  display: grid;
  gap: 24px;
  align-items: center;
  padding: 46px 48px;
  border-radius: 6px;
  color: #fff;
  /* Photo-backed hero (drop assets/img/rack_network_switch_dimitri_karastelev.jpg).
     The dark-green overlay keeps text AA-readable; the solid gradient is the
     graceful fallback shown until the photo file exists. */
  background:
    linear-gradient(115deg, rgba(20,42,31,0.93) 0%, rgba(31,66,49,0.82) 52%, rgba(34,72,54,0.55) 100%),
    url('../img/rack_network_switch_dimitri_karastelev.jpg') center / cover no-repeat,
    linear-gradient(135deg, #2f5941, #365e48);
  box-shadow: 0 18px 40px rgba(45,106,79,0.16);
}

.esp-hero-eyebrow {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
}

.esp-hero-card h2 {
  margin: 0 0 14px;
  font-size: 34px;
  font-weight: 900;
  color: #fff;
}

.esp-hero-card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: rgba(255,255,255,0.92);
}

.esp-hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 22px;
}

.esp-metric-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.28);
  background: rgba(255,255,255,0.08);
  font-weight: 700;
}


.shell-alert {
  padding: 18px 26px;
  border-radius: 6px;
  border: 2px solid rgba(244,162,97,0.7);
  background: linear-gradient(180deg, #fffaf0, #fff7e8);
  color: #9a6736;
  font-size: 16px;
  line-height: 1.55;
}

.warning-alert strong {
  color: #a1601f;
}

.info-card {
  display: grid;
  gap: 16px;
}

.info-card h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 900;
}

.info-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-soft);
}

.esp-flow-card {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  padding: 18px;
  border-radius: 6px;
  background: linear-gradient(180deg, #f7faf3, #eef8f0);
  border: 1px solid rgba(116,198,157,0.2);
}

.esp-flow-card span {
  display: grid;
  place-items: center;
  min-height: 40px;
  border-radius: 6px;
  background: #ffffff;
  color: var(--text-mid);
  font-weight: 800;
  font-size: 13px;
}

/* ── ESP real-world context band (photo figures) ──────────────────────────── */
.esp-context-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}
.esp-context-figure {
  margin: 0;
  display: grid;
  gap: 0;
  background: var(--white);
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: var(--shadow, 0 6px 22px rgba(33,52,38,0.06));
}
.esp-context-photo {
  min-height: 150px;
  background:
    linear-gradient(160deg, rgba(35,92,67,0.12), transparent 60%),
    linear-gradient(135deg, #d7e7dc, #c2e2cd);
  background-size: cover;
  background-position: center;
}
.esp-context-photo[data-esp-photo="cables"] {
  background:
    linear-gradient(160deg, rgba(20,42,31,0.18), transparent 62%),
    url('../img/network_cable_switch_jonathan.jpg') center / cover no-repeat,
    linear-gradient(135deg, #d7e7dc, #c2e2cd);
}
.esp-context-photo[data-esp-photo="terminal"] {
  background:
    linear-gradient(160deg, rgba(20,42,31,0.18), transparent 62%),
    url('../img/debian_terminal_lukas.jpg') center / cover no-repeat,
    linear-gradient(135deg, #d7e7dc, #c2e2cd);
}
.esp-context-figure figcaption {
  padding: 13px 16px 15px;
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--text-mid);
}

/* Open Source story banner (human collaboration photo). Gradient fallback until
   assets/img/laptop_collaboration_hands_john.jpg exists. */
.open-source-photo {
  min-height: 150px;
  margin-bottom: 18px;
  border-radius: 6px;
  background:
    linear-gradient(160deg, rgba(20,42,31,0.10), transparent 60%),
    url('../img/laptop_collaboration_hands_john.jpg') center / cover no-repeat,
    linear-gradient(135deg, #7cc49a, #2f8a5b);
}

/* ── Per-topic "Watch & revise" videos (click-to-load YouTube) ─────────────── */
.topic-videos {
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--green-pale);
}
.topic-videos-title {
  margin: 0 0 4px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-dark);
}
.topic-videos-note {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--text-soft);
}
.tv-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.tv-play,
.tv-link {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 0;
  text-align: left;
  background: var(--white);
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}
.tv-play:hover,
.tv-link:hover {
  transform: translateY(-2px);
  border-color: var(--green-mid);
  box-shadow: 0 8px 20px rgba(33, 52, 38, 0.10);
}
.tv-thumb {
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(120% 120% at 80% 10%, rgba(124,196,154,0.30), transparent 60%),
    linear-gradient(135deg, #2f5941, #235c43);
}
.tv-play-icon,
.tv-ext-icon {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  display: grid;
  place-items: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
  transition: transform 0.18s;
}
.tv-play:hover .tv-play-icon,
.tv-link:hover .tv-ext-icon { transform: scale(1.08); }
.tv-play-icon::after {
  content: "";
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 9px 0 9px 15px;
  border-color: transparent transparent transparent var(--green-dark);
  margin-left: 4px;
}
.tv-ext-icon::after {
  content: "\2197";
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  color: var(--green-dark);
}
.tv-meta {
  display: grid;
  gap: 3px;
  padding: 12px 14px 14px;
}
.tv-title {
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-dark);
}
.tv-channel {
  font-size: 12.5px;
  color: var(--text-soft);
}
/* A playing card expands to the full block width so the player + its native
   controls (incl. pause) are a usable size. */
.tv-card-playing {
  grid-column: 1 / -1;
}
.tv-embed-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}
.tv-embed-title {
  font-weight: 700;
  font-size: 14.5px;
  line-height: 1.3;
  color: var(--text-dark);
}
.tv-embed-close {
  flex-shrink: 0;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--green-pale);
  border-radius: 5px;
  background: var(--white);
  color: var(--text-mid);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.18s, color 0.18s;
}
.tv-embed-close:hover {
  border-color: var(--green-mid);
  color: var(--green-dark);
}
.tv-embed {
  aspect-ratio: 16 / 9;
  border-radius: 6px;
  overflow: hidden;
  background: #000;
}
.tv-embed iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ── ESP "zone": a distinct canvas so the section reads as its own space ───── */
body.esp-zone.app-shell {
  background-color: #edf1ea;
  background-image:
    radial-gradient(circle at 10% 0%, rgba(47,138,91,0.08), transparent 42%),
    radial-gradient(circle at 92% 6%, rgba(45,86,90,0.06), transparent 44%),
    radial-gradient(rgba(47,138,91,0.11) 1px, transparent 1px);
  background-size: auto, auto, 22px 22px;
  background-attachment: fixed;
}
body.esp-zone.theme-dark.app-shell {
  background-color: #151d18;
  background-image:
    radial-gradient(circle at 10% 0%, rgba(80,185,138,0.12), transparent 44%),
    radial-gradient(rgba(80,185,138,0.07) 1px, transparent 1px);
  background-size: auto, 22px 22px;
}
@media (max-width: 680px) {
  .esp-context-band { grid-template-columns: 1fr; }
}

.settings-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.settings-grid-wide {
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.95fr);
  align-items: start;
}

/* ── Settings: professional cards ── */
.settings-grid-cards {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: start;
}
.settings-pagehead { display: block; margin-bottom: 4px; }
.settings-pagehead h2 { margin: 2px 0 4px; }
.settings-card { display: flex; flex-direction: column; gap: 14px; }
.settings-card-head { display: flex; align-items: center; gap: 10px; }
.settings-card-head h3 { margin: 0; font-size: 16px; }
.settings-card-icon {
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 5px;
  background: var(--green-mist);
  color: var(--green-dark);
  flex: 0 0 auto;
}
.settings-card-icon svg { width: 17px; height: 17px; }
.settings-row {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 12px 14px;
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  cursor: pointer;
}
.settings-row:hover { border-color: var(--green-light); }
.settings-row-copy { display: flex; flex-direction: column; gap: 2px; }
.settings-row-copy strong { color: var(--text-dark); }
.settings-row-sub { font-size: 12px; color: var(--text-soft); }
/* toggle switch */
.settings-switch { position: relative; display: inline-flex; flex: 0 0 auto; }
.settings-switch input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: pointer; }
.settings-switch-track {
  width: 44px; height: 24px; border-radius: 999px;
  background: var(--green-pale);
  position: relative; transition: background 0.18s ease;
}
.settings-switch-track::after {
  content: ""; position: absolute; top: 2px; left: 2px;
  width: 20px; height: 20px; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,0.25);
  transition: transform 0.18s ease;
}
.settings-switch input:checked + .settings-switch-track { background: var(--green-mid); }
.settings-switch input:checked + .settings-switch-track::after { transform: translateX(20px); }
.settings-danger-button { color: var(--red); border-color: rgba(217,83,79,0.4); }
.settings-danger-button:hover { background: var(--red-light); border-color: var(--red); }

/* Reduce-motion: ONLY when the user turns it on. Fully disables animation +
   transitions (a clean stop, not a 0.001ms stutter). Default = animations on. */
body.reduce-motion *,
body.reduce-motion *::before,
body.reduce-motion *::after {
  animation: none !important;
  transition: none !important;
  scroll-behavior: auto !important;
}

.settings-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 28px 30px;
  background:
    radial-gradient(circle at top right, rgba(255,255,255,0.12), transparent 32%),
    linear-gradient(135deg, #f8fdf9, #eef8f0);
  border: 1px solid rgba(116,198,157,0.22);
}

.settings-hero-copy {
  display: grid;
  gap: 8px;
}

.settings-kicker {
  margin: 0;
  color: var(--green-mid);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.settings-hero-copy h3 {
  margin: 0;
  font-size: 28px;
  line-height: 1.1;
}

.settings-hero-copy .muted {
  margin: 0;
  max-width: 760px;
}

.settings-hero-graphic {
  display: grid;
  gap: 8px;
  justify-items: end;
  color: rgba(64,145,108,0.86);
  line-height: 1;
}

.settings-hero-graphic span:first-child {
  font-size: 54px;
}

.settings-hero-graphic span:last-child {
  margin-right: 10px;
  font-size: 38px;
}

.settings-profile-card,
.settings-shortcuts-card {
  display: grid;
  gap: 18px;
  min-height: 100%;
}

.settings-profile-card {
  padding: 24px;
}

.settings-profile-top {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 20px;
  align-items: center;
}

.settings-profile-copy {
  display: grid;
  gap: 8px;
}

.settings-profile-copy h3,
.settings-shortcuts-card h3 {
  margin: 0;
  font-size: 24px;
}

.settings-profile-copy .muted,
.settings-shortcuts-card .muted {
  margin: 0;
}

.settings-action-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

/* GDPR: "your account is scheduled for deletion" banner (Settings) */
.settings-deletion-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  padding: 12px 14px;
  border-radius: 6px;
  background: #fdf2e0;
  border: 1px solid #e0c98a;
  color: #8a5e16;
  font-size: 13px;
  font-weight: 600;
}
.settings-deletion-status[hidden] { display: none; }
.settings-deletion-status .action-button { margin-left: auto; min-height: 0; padding: 7px 14px; }
body.theme-dark .settings-deletion-status {
  background: rgba(224,162,60,0.16);
  border-color: rgba(224,162,60,0.40);
  color: #e4bd7d;
}

/* Subtle Privacy / Terms / Contact links at the foot of Settings */
.settings-legal-links {
  margin: 18px 0 0;
  text-align: center;
  font-size: 12px;
  color: var(--text-soft);
}
.settings-legal-links a { color: var(--text-soft); text-decoration: none; margin: 0 4px; }
.settings-legal-links a:hover { color: var(--green-mid); text-decoration: underline; }
.settings-legal-links span { opacity: 0.5; }

.settings-ref-code {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--text-mid);
}
.settings-ref-code strong {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  letter-spacing: 0.03em;
  color: var(--green-dark);
}
body.theme-dark .settings-ref-code strong { color: var(--green-light); }

.settings-utility-button {
  justify-content: center;
  min-height: 48px;
  border-radius: 6px;
  background: #f2f8f3;
  border: 1px solid rgba(116,198,157,0.22);
  color: var(--green-dark);
}

.settings-utility-button:hover {
  background: #e8f4ea;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 12px 14px;
  margin: 0 0 10px;
  border: 1px solid rgba(116,198,157,0.24);
  border-radius: 6px;
  background: #f2f8f3;
  cursor: pointer;
}

.theme-toggle-copy {
  display: grid;
  gap: 2px;
  color: var(--text-dark);
}

.theme-toggle-copy strong {
  font-family: var(--font-heading);
  font-size: 15px;
}

.theme-toggle-label {
  color: var(--text-soft);
  font-size: 13px;
  font-weight: 700;
}

.theme-toggle-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.theme-toggle-track {
  position: relative;
  width: 54px;
  height: 30px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: #c9dfd0;
  box-shadow: inset 0 0 0 1px rgba(45,106,79,0.12);
  transition: background 0.2s ease;
}

.theme-toggle-track::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--white);
  box-shadow: 0 2px 8px rgba(27,58,45,0.18);
  transition: transform 0.2s ease, background 0.2s ease;
}

.theme-toggle-input:checked + .theme-toggle-track {
  background: var(--green-dark);
}

.theme-toggle-input:checked + .theme-toggle-track::after {
  transform: translateX(24px);
}

.topic-controls-panel {
  display: grid;
  gap: 16px;
  padding: 24px 26px;
  background: linear-gradient(180deg, #ffffff, #f8fdf9);
  border: 1px solid rgba(116,198,157,0.22);
  box-shadow: 0 8px 24px rgba(45,106,79,0.06);
}

.topic-controls-panel #topic-summary {
  margin: 0;
  max-width: 820px;
  font-size: 16px;
  line-height: 1.65;
}

.modal-overlay,
.bug-modal {
  position: fixed;
  inset: 0;
  display: none;
  background: rgba(27,58,45,0.45);
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 80;
}

.modal-overlay.is-open,
.bug-modal.is-open {
  display: flex;
}

.bug-panel {
  width: min(680px, 100%);
  background: var(--white);
  border-radius: 6px;
  padding: 22px;
  box-shadow: var(--shadow-hover);
}

.profile-preview {
  width: 96px;
  height: 96px;
  border-radius: 999px;
  overflow: hidden;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--green-light), var(--green-mid));
  color: var(--white);
  font-size: 28px;
  font-weight: 800;
}

.profile-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.crop-shell {
  background: linear-gradient(180deg, #f6faf3, #f3f6f0);
  border: 1px dashed var(--green-light);
  border-radius: 6px;
  padding: 18px;
  display: grid;
  gap: 12px;
}

.field {
  display: grid;
  gap: 6px;
  margin-bottom: 12px;
}

.bug-form-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.field input,
.field textarea,
.field select {
  width: 100%;
  border: 1px solid rgba(116,198,157,0.45);
  border-radius: 6px;
  padding: 12px 14px;
  background: linear-gradient(180deg, #ffffff, #fbfefc);
}

.card:hover,
.topic-card:hover,
.topic-grid-card:hover,
.download-card:hover,
.audio-card:hover,
.quiz-card:hover,
.practice-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(45,106,79,0.12);
  border-color: rgba(116,198,157,0.28);
}

/* ─── Practice Question Cards ─────────────────────────────────────── */
#practice-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.pq-card {
  background: var(--white);
  border: 1px solid rgba(116,198,157,0.2);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.pq-card-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--green-mist);
}

.pq-card-title-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.pq-card-title {
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 800;
  color: var(--text-dark);
  margin: 0;
}

.pq-total-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--green-mid);
  background: var(--green-snow);
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  padding: 3px 10px;
  white-space: nowrap;
}

.pq-scenario {
  font-size: 13px;
  font-style: italic;
  color: var(--text-mid);
  background: var(--green-snow);
  border-left: 3px solid var(--green-light);
  border-radius: 0 8px 8px 0;
  padding: 10px 14px;
  margin-bottom: 14px;
  line-height: 1.6;
}

.pq-card-controls {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pq-expand-btn {
  font-size: 12px !important;
  padding: 5px 12px !important;
  min-height: 44px;
}

.pq-parts {
  padding: 0 20px 20px;
}

.pq-part {
  padding: 16px 0;
  border-bottom: 1px solid var(--green-mist);
}

.pq-part:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.pq-part-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.pq-cw-badge {
  display: inline-block;
  color: #fff;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
  border-radius: 5px;
  padding: 3px 7px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.pq-ref {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dark);
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.pq-question {
  font-size: 14px;
  color: var(--text-dark);
  line-height: 1.55;
  flex: 1;
}

.pq-marks {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-soft);
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.pq-ms-btn {
  font-size: 12px !important;
  padding: 5px 12px !important;
  margin-bottom: 0;
  min-height: 44px;
}

.pq-ms {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.28s ease, opacity 0.2s ease, margin-top 0.2s ease;
  opacity: 0;
  margin-top: 0;
}

.pq-ms.is-open {
  max-height: 800px;
  opacity: 1;
  margin-top: 10px;
}

.pq-ms-inner {
  background: #f9fef9;
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 13px;
  color: var(--text-mid);
  line-height: 1.65;
}

.pq-ms-inner strong {
  color: var(--green-dark);
  font-weight: 800;
}

@media (max-width: 600px) {
  .pq-part-header {
    flex-wrap: wrap;
  }
  .pq-marks {
    margin-left: auto;
  }
  .pq-card-header {
    padding: 16px 16px 12px;
  }
  .pq-parts {
    padding: 0 16px 16px;
  }
}

.action-button:hover,
.download-button:hover,
.rag-toggle button:hover {
  transform: translateY(-2px);
}

#qotd-shell .card,
#live-users-list,
#leaderboard-list,
#glossary-list,
#practice-grid,
#quiz-shell,
#flashcard-shell,
#topic-content-shell,
#study-content-shell {
  border-radius: 6px;
}

.footer-note {
  color: var(--text-soft);
  font-size: 13px;
}

@media (max-width: 900px) {
  .home-top-shell {
    grid-template-columns: 1fr;
  }

  .home-profile-dock {
    order: -1;
    justify-content: flex-end;
    padding-top: 0;
    margin-bottom: -6px;
  }

  .card-grid.cols-2 {
    grid-template-columns: 1fr;
  }

  .esp-hero-card {
    grid-template-columns: 1fr;
    padding: 30px 28px;
  }

  .esp-flow-card {
    grid-template-columns: 1fr;
  }

  .bug-form-grid {
    grid-template-columns: 1fr;
  }

  .topic-document-shell {
    padding: 26px 24px 30px;
    gap: 24px;
  }

  .topic-document-diagram {
    grid-template-columns: 1fr;
  }

  .topic-document-section-head,
  .topic-navigation-summary {
    grid-template-columns: 1fr;
  }

  .topic-document-section-head {
    display: grid;
  }

  .download-provider-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .settings-grid-wide,
  .settings-profile-top {
    grid-template-columns: 1fr;
  }

  .settings-hero {
    grid-template-columns: 1fr;
    padding: 24px;
  }

  .settings-hero-graphic {
    display: none;
  }

  .progress-topic-row,
  .progress-overview-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .flashcard-stage-card {
    min-height: 320px;
    padding: 32px 26px;
  }

  .flashcard-session-footer,
  .flashcard-session-actions {
    width: 100%;
  }

  .flashcard-session-actions {
    justify-content: stretch;
  }

  .flashcard-session-actions .action-button {
    flex: 1 1 180px;
    justify-content: center;
  }

  .progress-topic-actions,
  .progress-rag-toggle {
    width: 100%;
  }

  .topic-diagram-placeholder {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  #sidebar,
  #sidebar-restore-tab {
    display: none;
  }

  .app-main,
  .app-shell.sidebar-collapsed .app-main {
    width: 100%;
    margin-left: 0;
    padding: calc(var(--header-h) + 14px) 14px calc(var(--tabbar-h) + 26px);
  }

  .mobile-header {
    position: fixed;
    inset: 0 0 auto;
    height: var(--header-h);
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--white);
    border-bottom: 1px solid var(--green-pale);
    box-shadow: 0 2px 10px rgba(35,92,67,0.05);
    z-index: 50;
  }

  .mobile-header strong {
    font-family: var(--font-display);
    font-size: 20px;
    color: var(--green-dark);
  }

  .tab-bar {
    position: fixed;
    inset: auto 0 0;
    height: auto;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    padding: 8px 10px calc(8px + env(safe-area-inset-bottom, 0px));
    background: var(--white);
    border-top: 1px solid var(--green-pale);
    box-shadow: 0 -4px 16px rgba(35,92,67,0.06);
    z-index: 50;
  }

  .tab-bar button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    padding: 6px 4px;
    border: 0;
    background: transparent;
    border-radius: 6px;
    color: var(--text-soft);
    font-size: 10.5px;
    font-weight: 600;
  }

  .tab-bar button.is-active {
    background: var(--green-mist);
    color: var(--green-dark);
  }

  /* Dashboard top section stacks cleanly on small screens */
  .dash-topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .dash-hello { font-size: 19px; }

  .dash-topbar-right {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .dash-continue {
    flex-direction: column;
    align-items: flex-start;
  }

  .progress-topic-row {
    padding: 14px 16px;
  }

  .progress-rag-legend,
  .progress-overview-card {
    padding: 14px 16px;
  }

  .progress-rag-toggle button,
  .progress-inline-button {
    width: 100%;
  }

  .glossary-alpha-chip {
    min-width: 44px;
    padding-inline: 10px;
  }

  .glossary-shell-item {
    grid-template-columns: 1fr;
    padding: 14px 16px;
  }

  .flashcard-browser-head,
  .flashcard-browser-row {
    grid-template-columns: 1fr;
    align-items: flex-start;
  }

  .flashcard-browser-open {
    width: 100%;
  }

  .topic-learning-hero,
  .topic-learning-section,
  .topic-checklist-card,
  .topic-navigation-panel,
  .topic-diagram-placeholder {
    padding: 18px;
  }

  .topic-navigation-row {
    width: 100%;
  }

  .topic-navigation-row .action-button {
    width: 100%;
    justify-content: center;
  }
}

/* ═══════════════════════════════════════════════════════════════════════════
   TOPIC PAGE REDESIGN — chapter-based textbook reading layout
   All new classes are prefixed topic-chapter-, topic-section-, diagram-slot-,
   topic-toc-, or topic-nav- to avoid collision with existing shell classes.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Layout wrapper ── */

/* Core-content pages use the full width of a wider container than other pages
   (dashboard etc. stay at the default 1120px .page-inner). */
.page-inner.topic-page-inner {
  max-width: 1320px;
}

.topic-page-layout {
  width: 100%;
}

.topic-page-main {
  /* wider, more textbook-like reading measure (was 780px) — fills the grid track */
  max-width: 1000px;
  width: 100%;
}

/* Override inherited grid gap from old .topic-document-shell */
.topic-page-layout .topic-document-shell {
  display: block;
  gap: 0;
}

/* ── Chapter wrapper ── */

.topic-chapter {
  padding-bottom: 48px;
}

.topic-chapter-sep {
  border: none;
  border-top: 2px dashed rgba(116, 198, 157, 0.35);
  margin: 48px 0;
}

/* ── Chapter header: ref label + centred title + breadcrumb ── */

.topic-chapter-head {
  text-align: center;
  padding: 48px 0 36px;
  display: grid;
  gap: 14px;
  justify-items: center;
}

.topic-chapter-ref {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  /* inherits --topic-mid from #page-topic[data-topic]; falls back to green */
  color: var(--topic-mid, var(--green-mid));
  background: color-mix(in srgb, var(--topic-mid, #2f8a5b) 12%, #ffffff);
  padding: 4px 12px;
  border-radius: 999px;
}

.topic-chapter-title {
  font-family: var(--font-heading);
  font-size: 2.15rem;
  font-weight: 900;
  color: var(--green-dark);
  margin: 0;
  line-height: 1.15;
  text-align: center;
}

.topic-chapter-breadcrumb {
  font-size: 0.85rem;
  color: var(--text-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
  line-height: 1.5;
}

.topic-bc-sep {
  color: var(--green-light);
  padding: 0 7px;
  font-size: 1rem;
}

/* ── Introduction block ── */

.topic-chapter-intro {
  background: var(--green-snow);
  border-left: 3px solid var(--green-light);
  padding: 22px 26px;
  border-radius: 0 14px 14px 0;
  margin-bottom: 36px;
}

.topic-chapter-intro p {
  font-size: 1.04rem;
  line-height: 1.82;
  color: var(--text-mid);
  margin: 0 0 14px;
}

.topic-chapter-intro p:last-child {
  margin-bottom: 0;
}

/* ── Sections grid ── */

.topic-chapter-sections {
  display: grid;
  gap: 40px;
}

/* ── Individual section: ## heading + content ── */

.topic-section {
  display: grid;
  gap: 18px;
  scroll-margin-top: 80px;
}

/* h2 within sections — centred with decorative underline */
.topic-section-heading {
  font-family: var(--font-heading);
  font-size: 1.22rem;
  font-weight: 800;
  color: var(--green-dark);
  text-align: center;
  margin: 0;
  padding-bottom: 14px;
  position: relative;
}

.topic-section-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 44px;
  height: 2px;
  background: var(--topic-mid, var(--green-light));
  border-radius: 2px;
}

.topic-section-body {
  display: grid;
  /* minmax(0,1fr) stops a wide child (big table or full-width diagram) from
     expanding this grid track to its max-content and overflowing the section. */
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.topic-section-body p {
  margin: 0;
  color: var(--text-mid);
  line-height: 1.8;
  font-size: 1.02rem;
}

.topic-section-body li {
  font-size: 1.02rem;
}

.topic-section-body strong {
  color: var(--topic-dark, var(--green-dark));
}

.topic-section-body code {
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--green-mist);
  font-size: 0.88em;
  color: var(--green-dark);
}

/* h3 subsection headings — left-aligned */
.topic-section-h3 {
  font-family: var(--font-heading);
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--green-dark);
  margin: 6px 0 0;
  line-height: 1.35;
}

/* h4 sub-subsection headings — left-aligned, lighter */
.topic-section-h4 {
  font-family: var(--font-heading);
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--green-mid);
  margin: 4px 0 0;
  line-height: 1.35;
}

/* ── Diagram placeholder slots ── */

.diagram-slot {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border: 1.5px dashed rgba(116, 198, 157, 0.5);
  border-radius: 6px;
  background: var(--green-snow);
  color: var(--text-soft);
}

.diagram-slot-icon {
  font-size: 24px;
  opacity: 0.38;
  flex-shrink: 0;
  line-height: 1;
}

.diagram-slot-label {
  font-size: 13px;
  font-style: italic;
  line-height: 1.45;
  color: var(--text-soft);
}

/* ── Content tables (full-width, alternating rows, no heavy borders) ── */

.topic-table-wrap {
  overflow-x: auto;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.2);
  background: var(--white);
}

.topic-content-table,
.topic-spec-ref-table {
  width: 100%;
  border-collapse: collapse;
  /* Fit the content column and wrap text rather than clipping at the right
     edge; .topic-table-wrap keeps overflow-x:auto as a safety net for any
     genuinely wide table. */
  table-layout: fixed;
}

.topic-content-table th,
.topic-spec-ref-table th {
  padding: 11px 14px;
  background: var(--green-snow);
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: left;
  border-bottom: 1px solid rgba(116, 198, 157, 0.22);
  vertical-align: top;
}

.topic-content-table td,
.topic-spec-ref-table td {
  padding: 11px 14px;
  color: var(--text-mid);
  line-height: 1.68;
  vertical-align: top;
  border-bottom: 1px solid rgba(116, 198, 157, 0.1);
  overflow-wrap: break-word;
  word-break: break-word;
}

.topic-content-table th,
.topic-spec-ref-table th {
  overflow-wrap: break-word;
  word-break: break-word;
}

/* Alternating row shading */
.topic-content-table .topic-table-alt td {
  background: rgba(240, 250, 242, 0.55);
}

.topic-spec-ref-table tbody tr:nth-child(even) td {
  background: rgba(240, 250, 242, 0.55);
}

.topic-content-table tbody tr:last-child td,
.topic-spec-ref-table tbody tr:last-child td {
  border-bottom: 0;
}

/* Ref column in spec table — narrow, bold, non-wrapping */
.topic-spec-ref-cell {
  font-weight: 700;
  color: var(--green-dark);
  white-space: nowrap;
  width: 74px;
  font-size: 13px;
}

/* ── Content lists ── */

.topic-content-list {
  margin: 0;
  padding-left: 22px;
  display: grid;
  gap: 8px;
}

.topic-content-list li {
  color: var(--text-mid);
  line-height: 1.72;
}

.topic-content-list-ol {
  padding-left: 24px;
}

/* ── Spec reference section ── */

.topic-spec-table-section {
  padding-top: 8px;
}

/* ── Sources section ── */

.topic-sources-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  counter-reset: src;
}

/* Each source is a tidy citation card rather than a raw row. */
.topic-sources-item {
  counter-increment: src;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  padding: 12px 16px 12px 44px;
  position: relative;
  border: 1px solid rgba(116, 198, 157, 0.22);
  border-left: 3px solid var(--green-mid);
  border-radius: 6px;
  background: var(--green-snow);
}

/* Numbered marker, like a reference list */
.topic-sources-item::before {
  content: counter(src);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  min-width: 20px;
  height: 20px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--green-mist);
  color: var(--green-dark);
  font-size: 11px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.topic-sources-link {
  flex: 1 1 55%;
  color: var(--green-dark);
  font-weight: 700;
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
  word-break: break-word;
}

/* external-link cue */
.topic-sources-link::after {
  content: " \2197";
  font-size: 0.85em;
  color: var(--green-mid);
}

.topic-sources-link:hover,
.topic-sources-link:focus-visible {
  text-decoration: underline;
  outline: none;
}

.topic-source-domain {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--green-mist);
  padding: 2px 8px;
  border-radius: 999px;
}

.topic-source-refs {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-soft);
  line-height: 1.4;
  white-space: nowrap;
}

/* ── Collapsible Sources toggle (compact line-by-line when open) ── */
.topic-sources-summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  width: fit-content;
  padding: 7px 14px;
  border: 1px solid var(--green-pale);
  border-radius: 999px;
  background: var(--green-snow);
  font-size: 13px;
  font-weight: 700;
  color: var(--green-dark);
  user-select: none;
}
.topic-sources-summary::-webkit-details-marker { display: none; }
.topic-sources-summary::before {
  content: "\25B8"; /* ▸ */
  font-size: 11px;
  transition: transform 140ms ease;
  color: var(--green-mid);
}
.topic-sources-details[open] .topic-sources-summary::before { transform: rotate(90deg); }
.topic-sources-count {
  min-width: 20px;
  height: 19px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--green-mist);
  color: var(--green-dark);
  font-size: 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
/* the list's display:grid overrides the native closed-<details> hide, so hide it explicitly */
.topic-sources-details:not([open]) > .topic-sources-list { display: none; }
/* compact list once expanded: one tidy row per source, not big cards */
.topic-sources-details .topic-sources-list {
  margin-top: 12px;
  gap: 1px;
}
.topic-sources-details .topic-sources-item {
  flex-wrap: nowrap;
  align-items: baseline;
  gap: 10px;
  padding: 6px 10px 6px 34px;
  border: none;
  border-left: none;
  border-radius: 6px;
  background: transparent;
}
.topic-sources-details .topic-sources-item:hover { background: var(--green-snow); }
.topic-sources-details .topic-sources-item::before {
  left: 8px;
  background: transparent;
  color: var(--text-soft);
  font-weight: 700;
  min-width: 18px;
}
.topic-sources-details .topic-sources-link {
  flex: 1 1 auto;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topic-sources-details .topic-source-domain {
  flex: 0 0 auto;
  background: transparent;
  padding: 0;
}

/* ── Clickable glossary terms inside content + definition popover ── */

.topic-term {
  display: inline;
  margin: 0;
  padding: 0;
  border: none;
  background: none;
  font: inherit;
  color: var(--green-mid);
  font-weight: 600;
  cursor: pointer;
  border-bottom: 1px dotted var(--green-light);
}

.topic-term:hover,
.topic-term:focus-visible {
  color: var(--green-dark);
  border-bottom-color: var(--green-mid);
  outline: none;
}

.topic-term-pop {
  position: absolute;
  z-index: 1200;
  max-width: 320px;
  background: var(--white);
  border: 1px solid rgba(116, 198, 157, 0.4);
  border-radius: 6px;
  box-shadow: 0 14px 40px rgba(35, 76, 57, 0.18);
  padding: 14px 16px;
  font-size: 13.5px;
}

.topic-term-pop-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.topic-term-pop-head strong {
  color: var(--green-dark);
  font-size: 14.5px;
}

.topic-term-pop-topic {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--green-dark);
  background: var(--green-mist);
  padding: 2px 8px;
  border-radius: 999px;
}

.topic-term-pop-def {
  margin: 0 0 10px;
  color: var(--text-mid);
  line-height: 1.6;
}

.topic-term-pop-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.topic-term-pop-link {
  border: none;
  background: none;
  padding: 0;
  font: inherit;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--green-mid);
  cursor: pointer;
}

.topic-term-pop-link:hover,
.topic-term-pop-link:focus-visible {
  color: var(--green-dark);
  text-decoration: underline;
  outline: none;
}

body.theme-dark .topic-term-pop {
  background: #2a2c31;
  border-color: rgba(255,255,255,0.1);
}

body.theme-dark .topic-term {
  color: #5fc89a;
  border-bottom-color: rgba(134, 239, 172, 0.4);
}

/* ── On-this-page TOC sidebar ── */

/* Hidden by default; shown as sticky sidebar on wide viewports */
.topic-toc {
  display: none;
}

.topic-toc-inner {
  padding: 16px 14px;
  background: var(--white);
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.22);
  box-shadow: 0 4px 16px rgba(45, 106, 79, 0.06);
}

.topic-toc-heading {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin: 0 0 12px;
}

.topic-toc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.topic-toc-chapter {
  margin-bottom: 10px;
}

.topic-toc-chapter-link {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--green-dark);
  padding: 4px 0;
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.15s ease;
}

.topic-toc-chapter-link:hover,
.topic-toc-chapter-link:focus-visible {
  color: var(--green-mid);
  outline: none;
}

.topic-toc-sublist {
  margin: 4px 0 0 10px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border-left: 2px solid var(--green-mist);
  padding-left: 10px;
}

.topic-toc-link {
  display: block;
  font-size: 11px;
  color: var(--text-soft);
  padding: 3px 0;
  text-decoration: none;
  line-height: 1.45;
  transition: color 0.15s ease;
}

.topic-toc-link:hover,
.topic-toc-link:focus-visible {
  color: var(--green-mid);
  outline: none;
}

/* current-section highlight (scroll-spy) */
.topic-toc-link.is-current {
  color: var(--topic-mid, var(--green-dark));
  font-weight: 700;
  background: color-mix(in srgb, var(--topic-mid, #2f8a5b) 9%, transparent);
  border-radius: 7px;
  padding-left: 7px;
  margin-left: -7px;
}

/* progress bar */
.topic-toc-progress {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
}
.topic-toc-progress-track {
  flex: 1 1 auto;
  height: 6px;
  border-radius: 999px;
  background: var(--green-mist);
  overflow: hidden;
}
.topic-toc-progress-track > span {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--topic-mid, var(--green-mid));
  transition: width 220ms ease;
}
.topic-toc-progress-label {
  font-size: 11px;
  font-weight: 800;
  color: var(--topic-mid, var(--green-dark));
  min-width: 30px;
  text-align: right;
}

/* "Next section" button */
.topic-toc-next {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1px;
  width: 100%;
  margin-top: 14px;
  padding: 9px 12px;
  border: 1px solid var(--green-pale);
  border-radius: 6px;
  background: var(--green-snow);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.topic-toc-next:hover { border-color: var(--green-light); background: var(--green-mist); }
.topic-toc-next-hint {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-soft);
}
.topic-toc-next-name { font-size: 12px; font-weight: 700; color: var(--green-dark); line-height: 1.3; }

/* ── Navigation footer ── */

.topic-nav-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  padding: 28px 0 0;
  margin-top: 16px;
  border-top: 1px solid rgba(116, 198, 157, 0.2);
  align-items: start;
}

.topic-nav-prev {
  display: flex;
  justify-content: flex-start;
}

.topic-nav-centre {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 2px;
}

.topic-nav-next {
  display: flex;
  justify-content: flex-end;
}

.topic-nav-button {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-radius: 6px;
  border: 1px solid rgba(116, 198, 157, 0.28);
  background: var(--white);
  color: var(--green-dark);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
  text-align: left;
  max-width: 200px;
}

.topic-nav-button:hover {
  background: var(--green-snow);
  border-color: rgba(64, 145, 108, 0.38);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(45, 106, 79, 0.1);
}

.topic-nav-button.is-disabled {
  opacity: 0.35;
  pointer-events: none;
  cursor: default;
}

.topic-nav-button-fwd {
  text-align: right;
  flex-direction: row-reverse;
}

.topic-nav-overview {
  background: var(--green-snow);
  border-color: rgba(116, 198, 157, 0.35);
  font-size: 12px;
  padding: 10px 14px;
  max-width: none;
  white-space: nowrap;
}

.topic-nav-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.topic-nav-hint {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-soft);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.topic-nav-name {
  font-size: 12px;
  font-weight: 700;
  color: var(--green-dark);
  line-height: 1.35;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.topic-nav-arrow {
  font-size: 17px;
  color: var(--green-mid);
  flex-shrink: 0;
}

.open-source-story-card,
.open-source-section {
  margin-top: 22px;
}

.open-source-story-card h3,
.open-source-section-head h3 {
  margin: 0 0 10px;
  color: var(--green-dark);
}

.open-source-story-card p,
.open-source-section-head p {
  max-width: 940px;
}

.open-source-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.open-source-facts span {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  border: 1px solid rgba(45, 106, 79, 0.12);
  border-radius: 6px;
  background: rgba(244, 250, 247, 0.86);
  color: var(--text-mid);
  font-size: 13px;
  font-weight: 700;
}

.open-source-facts strong {
  color: var(--green-dark);
  font-size: 24px;
  line-height: 1;
}

.open-source-section-head {
  margin-bottom: 14px;
}

.open-source-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.open-source-grid.is-compact {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.open-source-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 100%;
}

.open-source-card h4 {
  margin: 0;
  color: var(--green-dark);
  font-size: 18px;
}

.open-source-card p,
.open-source-card li {
  font-size: 14px;
  line-height: 1.55;
}

.open-source-card ul {
  margin: 0 0 4px 18px;
  padding: 0;
  color: var(--text-mid);
}

.open-source-card .download-button {
  margin-top: auto;
  align-self: flex-start;
}

.open-source-type {
  align-self: flex-start;
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(45, 122, 122, 0.1);
  color: var(--green-dark);
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

/* ── Wide viewport: two-column layout with sticky TOC ── */

@media (min-width: 1160px) {
  .topic-page-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 232px;
    align-items: start;
    gap: 48px;
  }

  .topic-page-main {
    grid-column: 1;
  }

  .topic-toc {
    display: block;
    grid-column: 2;
    position: sticky;
    top: 28px;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
  }
}

/* ── Narrow viewport adjustments ── */

@media (max-width: 640px) {
  .topic-chapter-head {
    padding: 32px 0 24px;
  }

  .topic-chapter-title {
    font-size: 1.65rem;
  }

  .topic-chapter-intro {
    padding: 16px 18px;
  }

  .topic-nav-footer {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }

  .topic-nav-prev,
  .topic-nav-centre,
  .topic-nav-next {
    justify-content: stretch;
  }

  .topic-nav-button,
  .topic-nav-overview {
    width: 100%;
    max-width: none;
    justify-content: center;
  }

  .topic-nav-button-fwd {
    flex-direction: row;
  }

  .file-browser-head,
  .file-row {
    grid-template-columns: 1fr;
  }

  .file-browser-head {
    align-items: flex-start;
  }

  .file-kind {
    justify-self: flex-start;
  }

  .file-row-actions {
    width: 100%;
  }

  .file-action {
    flex: 1;
  }
}

body.theme-dark {
  /* Soft neutral dark (Discord-inspired): grey surfaces, muted green accent,
     low-contrast text. No near-black, no neon green. */
  --green-dark: #7ed3a6;   /* accent text / headings — soft light green */
  --green-mid: #50b98a;    /* primary buttons — muted green */
  --green-light: #8ad9b2;
  --green-pale: #3a3d44;   /* borders (neutral, not green) */
  --green-mist: #2e3035;   /* pill / track backgrounds (elevated neutral) */
  --green-snow: #1f2024;   /* inset / track bg */
  --white: #26282c;        /* card + nav surface */
  --text-dark: #dbdee1;    /* primary text */
  --text-mid: #b3b8c0;     /* secondary */
  --text-soft: #969ca6;    /* muted */
  --red: #e0696b;
  --red-light: #3a2426;
  --amber: #d2a45a;
  --amber-light: #352e1f;
  --shadow: 0 6px 22px rgba(0,0,0,0.30);
  --shadow-hover: 0 14px 36px rgba(0,0,0,0.42);
  background: #1b1c1f;     /* app canvas */
  color: var(--text-dark);
}

body.theme-dark #sidebar,
body.theme-dark .lite-sidebar,
body.theme-dark .tab-bar,
body.theme-dark .lite-tabbar,
body.theme-dark .card,
body.theme-dark .shell-notice-bar,
body.theme-dark .bug-panel,
body.theme-dark .avatar-panel,
body.theme-dark .settings-profile-card,
body.theme-dark .settings-shortcuts-card,
body.theme-dark .download-card,
body.theme-dark .topic-card,
body.theme-dark .topic-grid-card,
body.theme-dark .quiz-card,
body.theme-dark .live-shell-card,
body.theme-dark .file-browser-section,
body.theme-dark .file-row,
body.theme-dark .leaderboard-item,
body.theme-dark .live-users-item,
body.theme-dark .topic-document-shell,
body.theme-dark .topic-controls-panel,
body.theme-dark .practice-question-card,
body.theme-dark .flashcard-card,
body.theme-dark .quiz-session-card,
body.theme-dark .quiz-results-card {
  background: #26282c;
  border-color: rgba(255,255,255,0.08);
  color: var(--text-dark);
  box-shadow: var(--shadow);
}

/* ── Dark-mode fixes for newer components ── */
/* Hand-authored SVG diagrams are designed for a light surface. In dark mode we
   keep a LIGHT plate (so the SVGs stay legible) but dim it well below pure white
   so it doesn't glare against the dark page, and darken the two text-only grey
   fills so secondary labels stay readable on the dimmer plate. */
body.theme-dark .topic-diagram {
  background: #dfe4dc;
  border-color: rgba(255, 255, 255, 0.10);
}
body.theme-dark .topic-diagram svg [fill="#7a8178"] { fill: #565d57; }
body.theme-dark .topic-diagram svg [fill="#4c574f"] { fill: #3a413b; }
body.theme-dark .topic-diagram figcaption {
  color: #3f473f;
  border-top-color: #c3ccbe;
}
/* Dim the vivid illustrated topic-card covers so they don't glare in dark mode */
body.theme-dark .topic-card-cover { filter: brightness(0.82) saturate(0.92); }
/* Topic-page RAG control: the #page-topic light rules carry ID specificity and
   were beating the theme-dark class rules → white bar + light (invisible) text.
   Re-assert a dark surface at matching specificity. */
body.theme-dark #page-topic .rag-toggle {
  background: #2e3035;
  border-color: rgba(255, 255, 255, 0.10);
}
body.theme-dark #page-topic .rag-toggle button {
  background: transparent;
  border-right-color: rgba(255, 255, 255, 0.08);
}
body.theme-dark #page-topic .rag-toggle button[data-value="red"]:not(.is-active)   { color: #f0a0a2; }
body.theme-dark #page-topic .rag-toggle button[data-value="amber"]:not(.is-active) { color: #e4bd7d; }
body.theme-dark #page-topic .rag-toggle button[data-value="green"]:not(.is-active) { color: #8ad9b2; }
body.theme-dark #page-topic .rag-toggle button:not(.is-active):hover {
  background: rgba(255, 255, 255, 0.06);
}
body.theme-dark #page-topic .rag-toggle button.is-active[data-value="red"]   { background: #bf3d38; color: #fff; }
body.theme-dark #page-topic .rag-toggle button.is-active[data-value="amber"] { background: #b9853a; color: #241b04; }
body.theme-dark #page-topic .rag-toggle button.is-active[data-value="green"] { background: #2b7e52; color: #fff; }
/* Brighter focus ring on the dark canvas (green-mid is a touch dim on near-black) */
body.theme-dark a:focus-visible,
body.theme-dark button:focus-visible,
body.theme-dark input:focus-visible,
body.theme-dark select:focus-visible,
body.theme-dark textarea:focus-visible,
body.theme-dark summary:focus-visible,
body.theme-dark [tabindex]:focus-visible,
body.theme-dark [role="button"]:focus-visible,
body.theme-dark [role="tab"]:focus-visible {
  outline-color: #7ed3a6;
}
/* A-08 quiz pass/fail badge — dark surfaces with readable tinted text */
body.theme-dark .quiz-result-status.is-pass {
  background: rgba(80,185,138,0.16);
  color: #7ed3a6;
  border-color: rgba(80,185,138,0.4);
}
body.theme-dark .quiz-result-status.is-fail {
  background: rgba(217,83,79,0.16);
  color: #f0a0a2;
  border-color: rgba(217,83,79,0.4);
}
/* per-topic bold text uses --topic-dark (a DARK colour) → dark-on-dark in dark
   mode; force a light accent so it stays readable */
body.theme-dark .topic-section-body strong { color: var(--green-light); }
/* per-topic hero stays its slate gradient (fine on dark); keep the faint wash subtle */
body.theme-dark #page-topic[data-topic] { background: none; }
body.theme-dark .topic-sources-summary { background: var(--green-mist); }
/* chapter ref pill + section underline: use the brand light-green in dark mode
   (the color-mix-with-white pill would otherwise be a bright light chip) */
body.theme-dark .topic-chapter-ref { color: var(--green-light); background: rgba(134,239,172,0.12); }
body.theme-dark .topic-section-heading::after { background: var(--green-light); }
/* learning-block accent kickers readable on dark */
body.theme-dark .lb-exam .lb-kicker { color: #8fb0e6; }
body.theme-dark .lb-mistake .lb-kicker { color: #e0b265; }
body.theme-dark .lb-quickcheck .lb-kicker,
body.theme-dark .lb-quickcheck summary::after { color: #b99cf0; }
body.theme-dark .lb-quickcheck { border-left-color: #8a6fc0; }
/* compare-card tag chips: keep readable on dark */
body.theme-dark .compare-tag-good { background: #2e3035; color: var(--green-light); }
body.theme-dark .compare-tag-bad { background: #412e14; color: #e0b265; }
body.theme-dark .compare-tag-exam { background: #18233a; color: #8fb0e6; }
body.theme-dark .topic-toc-next { background: var(--green-mist); }

body.theme-dark .lu-count-bar {
  border-bottom-color: rgba(134,239,172,0.15);
}

body.theme-dark .lu-count-label {
  color: rgba(255,255,255,0.6);
}

body.theme-dark .lu-name {
  color: #e0f2e9;
}

body.theme-dark .lu-pts {
  color: rgba(255,255,255,0.5);
}

body.theme-dark .lu-empty {
  color: rgba(255,255,255,0.45);
}

body.theme-dark .sidebar-logo-lockup,
body.theme-dark .settings-hero,
body.theme-dark .lite-hero-banner,
body.theme-dark .progress-overview-card,
body.theme-dark .theme-toggle {
  background: linear-gradient(135deg, #0f261d, #06110d);
  border-color: rgba(134,239,172,0.2);
  color: var(--text-dark);
}

body.theme-dark .sidebar-logo,
body.theme-dark #sidebar,
body.theme-dark .lite-sidebar,
body.theme-dark .tab-bar,
body.theme-dark .lite-tabbar {
  border-color: rgba(134,239,172,0.18);
}

body.theme-dark .nav-item,
body.theme-dark .lite-sidebar-nav button,
body.theme-dark .tab-bar button,
body.theme-dark .lite-tabbar button,
body.theme-dark .muted,
body.theme-dark .footer-note,
body.theme-dark .page-intro,
body.theme-dark .shell-small-copy,
body.theme-dark .topic-source-domain,
body.theme-dark .topic-source-refs,
body.theme-dark .file-row-main span,
body.theme-dark .theme-toggle-label {
  color: var(--text-soft);
}

body.theme-dark .nav-item:hover,
body.theme-dark .nav-item.is-active,
body.theme-dark .nav-item.active,
body.theme-dark .lite-sidebar-nav button:hover,
body.theme-dark .lite-sidebar-nav button.is-active,
body.theme-dark .tab-bar button.is-active,
body.theme-dark .lite-tabbar button.is-active,
body.theme-dark .settings-utility-button,
body.theme-dark .action-button {
  background: #2e3035;
  color: var(--text-dark);
  border-color: rgba(255,255,255,0.10);
}

body.theme-dark .action-button.is-primary,
body.theme-dark .download-button,
body.theme-dark .quiz-launch-button {
  background: #50b98a;
  color: #0f1f17;
}

body.theme-dark .topic-sources-item {
  background: #2a2c31;
  border-color: rgba(255,255,255,0.08);
  border-left-color: #50b98a;
}

body.theme-dark .topic-sources-item::before {
  background: #34373d;
  color: var(--green-light);
}

body.theme-dark input,
body.theme-dark select,
body.theme-dark textarea,
body.theme-dark .input-wrap input,
body.theme-dark .rag-toggle,
body.theme-dark .progress-rag-toggle,
body.theme-dark .content-placeholder,
body.theme-dark .empty-state,
body.theme-dark .topic-table-wrap,
body.theme-dark .topic-content-table,
body.theme-dark .topic-spec-ref-table {
  background: #1f2024;
  border-color: rgba(255,255,255,0.08);
  color: var(--text-dark);
}

body.theme-dark .topic-content-table th,
body.theme-dark .topic-spec-ref-table th,
body.theme-dark .topic-table-alt,
body.theme-dark .progress-topic-row,
body.theme-dark .open-source-fact,
body.theme-dark .open-source-download-card,
body.theme-dark .esp-task-panel,
body.theme-dark .esp-guide-panel {
  background: #2e3035;
  border-color: rgba(255,255,255,0.08);
  color: var(--text-dark);
}

body.theme-dark a,
body.theme-dark .settings-kicker,
body.theme-dark .lite-hero-kicker,
body.theme-dark .section-title,
body.theme-dark .page-header h2,
body.theme-dark .page-header h3,
body.theme-dark .logo-wordmark,
body.theme-dark .topic-section-heading,
body.theme-dark .topic-section-h3,
body.theme-dark .topic-source-domain,
body.theme-dark .file-kind {
  color: var(--green-dark);
}

/* ── Dark-mode contrast fixes: QOTD options, RAG toggles, legend, tables ── */
/* Question-of-the-Day answer options hardcode a white background → blinding
   white boxes on the dark dashboard. Flip them to the elevated dark surface. */
body.theme-dark .qotd-option-button {
  background: #2e3035;
  border-color: rgba(255,255,255,0.10);
  color: var(--text-dark);
}
body.theme-dark .qotd-option-button:hover:not(:disabled) {
  background: #34373d;
  border-color: var(--green-mid);
}
body.theme-dark .qotd-opt-correct {
  background: rgba(80,185,138,0.18) !important;
  border-color: var(--green-mid) !important;
  color: var(--green-light) !important;
}
body.theme-dark .qotd-opt-disabled {
  background: #24262a;
  border-color: rgba(255,255,255,0.06);
  color: var(--text-soft);
}

/* RAG toggle buttons (Progress page + topic page) hardcode white backgrounds.
   Give them dark surfaces with readable tinted labels in dark mode. */
body.theme-dark .rag-toggle button[data-value="red"],
body.theme-dark .progress-rag-toggle button[data-value="red"] {
  background: #2e3035;
  color: #f0a0a2;
  border-color: rgba(224,105,107,0.35);
}
body.theme-dark .rag-toggle button[data-value="amber"],
body.theme-dark .progress-rag-toggle button[data-value="amber"] {
  background: #2e3035;
  color: #e4bd7d;
  border-color: rgba(210,164,90,0.35);
}
body.theme-dark .rag-toggle button[data-value="green"],
body.theme-dark .progress-rag-toggle button[data-value="green"] {
  background: #2e3035;
  color: #8ad9b2;
  border-color: rgba(80,185,138,0.35);
}
/* keep the saturated "active" RAG colour fills readable */
body.theme-dark .rag-toggle button[data-value="red"].is-active,
body.theme-dark .progress-rag-toggle button[data-value="red"].is-active   { background: #c2504d; color: #fff; }
body.theme-dark .rag-toggle button[data-value="amber"].is-active,
body.theme-dark .progress-rag-toggle button[data-value="amber"].is-active { background: #b9853a; color: #fff; }
body.theme-dark .rag-toggle button[data-value="green"].is-active,
body.theme-dark .progress-rag-toggle button[data-value="green"].is-active { background: #3f9d74; color: #fff; }

/* Progress RAG legend bar + the legend / status pills */
body.theme-dark .progress-rag-legend {
  background: #26282c;
  border-color: rgba(255,255,255,0.08);
}
body.theme-dark .progress-legend-chip.is-red,
body.theme-dark .progress-status-pill.is-red    { background: rgba(224,105,107,0.16); color: #f0a0a2; }
body.theme-dark .progress-legend-chip.is-amber,
body.theme-dark .progress-status-pill.is-amber  { background: rgba(210,164,90,0.16); color: #e4bd7d; }
body.theme-dark .progress-legend-chip.is-green,
body.theme-dark .progress-status-pill.is-green  { background: rgba(80,185,138,0.18); color: #8ad9b2; }
body.theme-dark .progress-status-pill           { background: #2e3035; color: var(--text-soft); }
body.theme-dark .progress-status-pill.is-complete { background: rgba(80,185,138,0.18); color: #8ad9b2; }

/* Progress view tabs (RAG Ratings / Topic Completion) */
body.theme-dark .progress-tab-row { background: #1f2024; }
body.theme-dark .progress-tab-chip.is-active {
  background: #2e3035;
  color: var(--green-dark);
  box-shadow: none;
}

/* Topic content tables: the alt-row shading is a light green wash that turns
   into a washed-out low-contrast band in dark mode. Use a subtle dark
   elevation and keep the text light. */
body.theme-dark .topic-content-table td,
body.theme-dark .topic-spec-ref-table td {
  color: var(--text-mid);
  border-bottom-color: rgba(255,255,255,0.07);
}
body.theme-dark .topic-content-table .topic-table-alt td,
body.theme-dark .topic-spec-ref-table tbody tr:nth-child(even) td {
  background: rgba(255,255,255,0.035);
}
body.theme-dark .topic-content-table th,
body.theme-dark .topic-spec-ref-table th {
  background: #26282c;
  color: var(--green-light);
  border-bottom-color: rgba(255,255,255,0.10);
}

/* Mobile: the topic-page RAG control fits all three states on ONE horizontal row
   (equal thirds, no wrap) and closes the Green segment with a green line.
   Placed at end-of-file so it beats the dark-mode divider-colour rule on the cascade. */
@media (max-width: 520px) {
  #page-topic .rag-toggle {
    width: 100%;
    flex-wrap: nowrap;
  }
  #page-topic .rag-toggle button {
    min-width: 0;
    flex: 1 1 0;
    padding: 12px 8px;
  }
  /* Green closing line mirrors the Red opening line (1px, same low opacity). */
  #page-topic .rag-toggle button[data-value="green"] {
    border-right: 1px solid rgba(47, 138, 91, 0.35);
  }
  body.theme-dark #page-topic .rag-toggle button[data-value="green"] {
    border-right: 1px solid rgba(80, 185, 138, 0.35);
  }
}