/* ==========================================================================
   WINRAAZ — Stylesheet
   Design language: "field notebook / herbarium specimen" — paper surfaces,
   chlorophyll green + ochre ink accents, stitched-line borders, specimen
   tag numbering on chapter cards.
   ========================================================================== */

:root {
  /* Color tokens — light (paper) mode */
  --bg: #FAFAF6;
  --bg-alt: #F1EFE6;
  --surface: #FFFFFE;
  --ink: #1C2B22;
  --ink-soft: #4B5B4F;
  --line: #D9D2BF;
  --line-soft: #E7E2D2;
  --green: #2F6844;
  --green-deep: #1F4A30;
  --green-tint: #E4EEE3;
  --ochre: #C1791F;
  --ochre-tint: #F6E8D2;
  --rust: #A13D2B;
  --rust-tint: #F4E1DA;
  --surface-strong: color-mix(in srgb, var(--surface) 88%, var(--ink) 8%);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --radius: 10px;
  --radius-lg: 18px;
  --shadow-card: 0 1px 2px rgba(28,43,34,0.06), 0 8px 24px -12px rgba(28,43,34,0.18);
  --transition: 180ms cubic-bezier(.4,0,.2,1);

  --font-scale: 1;
  --reading-width: 720px;
}

[data-theme="dark"] {
  --bg: #10160F;
  --bg-alt: #161D14;
  --surface: #1A2318;
  --ink: #EAE8DD;
  --ink-soft: #B7C0B0;
  --line: #33402F;
  --line-soft: #2A3527;
  --green: #6FBF8B;
  --green-deep: #8FD4A6;
  --green-tint: #1D2E22;
  --ochre: #E5A857;
  --ochre-tint: #2E2617;
  --rust: #E38A73;
  --rust-tint: #2E1C17;
  --shadow-card: 0 1px 2px rgba(0,0,0,0.3), 0 12px 28px -14px rgba(0,0,0,0.6);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  font-size: calc(16px * var(--font-scale));
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition), color var(--transition);
}

img { max-width: 100%; display: block; }

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

button { font-family: inherit; cursor: pointer; }

::selection { background: var(--ochre-tint); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==========================================================================
   Top bar
   ========================================================================== */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  max-width: 1100px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
  white-space: nowrap;
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.topbar-search {
  flex: 1;
  max-width: 420px;
  position: relative;
}

.topbar-search input {
  width: 100%;
  padding: 9px 14px 9px 36px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.92rem;
  transition: border var(--transition), box-shadow var(--transition);
}

.topbar-search input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px var(--green-tint);
  outline: none;
}

.topbar-search svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--ink-soft);
  pointer-events: none;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.icon-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), transform var(--transition);
}

.icon-btn:hover { background: var(--green-tint); }
.icon-btn svg { width: 18px; height: 18px; }

/* ==========================================================================
   Hero (homepage)
   ========================================================================== */

.hero {
  padding: 64px 20px 40px;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  position: relative;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ochre);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px dashed var(--ochre);
  border-radius: 999px;
  margin-bottom: 22px;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  line-height: 1.08;
  margin: 0 0 18px;
  max-width: 15ch;
  letter-spacing: -0.01em;
}

.hero h1 em {
  font-style: italic;
  color: var(--green);
}

.hero p {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 0 0 32px;
}

.hero-stats {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-stat .num {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--green);
}

.hero-stat .label {
  font-size: 0.78rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-poster-col {
  display: block;
  position: relative;
  width: 215px;
  aspect-ratio: 16 / 9;
  max-width: 68vw;
  margin: 28px auto 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.hero-poster-col {
  background: var(--ink);
}

.hero-poster-col img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center center;
  display: block;
}

.hero-poster-overlay {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 14px 14px;
  background: linear-gradient(to top, rgba(0,0,0,0.72) 0%, rgba(0,0,0,0.4) 55%, rgba(0,0,0,0) 100%);
}

.hero-poster-overlay p {
  margin: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.84rem;
  line-height: 1.4;
  color: #fff;
  text-align: center;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

@media (min-width: 900px) {
  .hero-poster-col {
    position: absolute;
    right: 0;
    top: 4px;
    width: 260px;
    aspect-ratio: 16 / 9;
    max-width: none;
    margin: 0;
  }
  .hero-inner { padding-right: 290px; }
}

/* Primary full-width CTA button */
.cta-primary-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: calc(100% - 40px);
  max-width: 640px;
  margin: 28px auto 40px;
  padding: 16px 24px;
  background: var(--green);
  color: #fff;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.02rem;
  border: none;
  border-radius: 14px;
  box-shadow: 0 4px 14px -2px rgba(47,104,68,0.45), 0 2px 4px -1px rgba(47,104,68,0.3);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.cta-primary-btn:hover {
  background: var(--green-deep);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px -2px rgba(47,104,68,0.5), 0 3px 6px -1px rgba(47,104,68,0.35);
}
.cta-primary-btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 6px -1px rgba(47,104,68,0.4);
}

/* Subtle homepage enhancements — same palette/tokens, no new colors */
.hero {
  background: radial-gradient(circle at 15% 20%, var(--green-tint) 0%, transparent 55%),
              radial-gradient(circle at 85% 75%, var(--ochre-tint) 0%, transparent 50%);
}

.home-feature-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: 640px;
  margin: 0 auto 8px;
  padding: 0 20px;
}

.home-feature-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--green-deep);
  background: var(--green-tint);
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 999px;
}
[data-theme="dark"] .home-feature-chip { color: var(--green); }

.home-divider {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 480px;
  margin: 36px auto 20px;
  padding: 0 20px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.home-divider::before, .home-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.home-subject-strip {
  display: flex;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
  max-width: 560px;
  margin: 0 auto 8px;
  padding: 0 20px;
}

.home-subject-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 600;
}

.home-subject-icon .badge {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--green);
  transition: transform var(--transition), border-color var(--transition);
}
.home-subject-icon:hover .badge {
  transform: translateY(-2px);
  border-color: var(--green);
}
.home-subject-icon .badge svg { width: 20px; height: 20px; }

/* ==========================================================================
   Chapter grid
   ========================================================================== */

.section-label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 56px 0 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.section-label h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.5rem;
  margin: 0;
}

.section-label span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 18px;
  padding-bottom: 20px;
}

.chapter-card {
  position: relative;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 20px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.chapter-card::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  pointer-events: none;
  opacity: 0.6;
}

.chapter-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
  border-color: var(--green);
}

.chapter-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
}

.chapter-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--ochre);
  background: var(--ochre-tint);
  border-radius: 6px;
  padding: 3px 8px;
}

.chapter-icon {
  width: 34px;
  height: 34px;
  color: var(--green);
}

.chapter-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.3;
}

.chapter-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0;
  flex-grow: 1;
}

.chapter-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.chapter-card-meta .arrow {
  color: var(--green);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: gap var(--transition);
}

.chapter-card:hover .arrow { gap: 8px; }

.progress-ring-mini {
  width: 22px;
  height: 22px;
}

/* ==========================================================================
   Search results overlay
   ========================================================================== */

.search-panel {
  position: fixed;
  inset: 0;
  background: rgba(16, 22, 15, 0.45);
  backdrop-filter: blur(2px);
  z-index: 100;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 16px 16px;
}

.search-panel.open { display: flex; }

.search-panel-inner {
  background: var(--surface);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  max-height: 70vh;
  overflow-y: auto;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.search-panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
  position: sticky;
  top: 0;
  background: var(--surface);
}

.search-panel-header input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 1rem;
  color: var(--ink);
  font-family: var(--font-body);
}
.search-panel-header input:focus { outline: none; }

.search-result {
  padding: 12px 18px;
  border-bottom: 1px solid var(--line-soft);
  display: block;
  cursor: pointer;
}
.search-result:hover { background: var(--green-tint); }

.search-result .chip {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.search-result .snippet {
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin-top: 4px;
}

.search-result mark {
  background: var(--ochre-tint);
  color: var(--ink);
  border-radius: 3px;
  padding: 0 2px;
}

.search-empty {
  padding: 30px 18px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

/* ==========================================================================
   Chapter page
   ========================================================================== */

.chapter-hero {
  padding: 26px 20px 20px;
  border-bottom: 1px solid var(--line-soft);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.breadcrumb a:hover { color: var(--green); }
.breadcrumb .sep { opacity: 0.5; }
.breadcrumb .current { color: var(--ink); font-weight: 600; }

.chapter-hero-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.chapter-hero-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ochre);
  letter-spacing: 0.08em;
}

.chapter-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.3rem);
  font-weight: 600;
  margin: 6px 0 8px;
  max-width: 24ch;
}

.chapter-hero .tagline {
  color: var(--ink-soft);
  font-size: 1rem;
  max-width: 55ch;
}

.chapter-hero-tools {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  min-height: 44px;
  box-sizing: border-box;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--ink);
  font-size: 0.84rem;
  transition: border var(--transition), background var(--transition);
}
.pill-btn:hover { border-color: var(--green); background: var(--green-tint); }
.pill-btn svg { width: 15px; height: 15px; }
.pill-btn.active { background: var(--green); border-color: var(--green); color: #fff; }

.reading-progress-track {
  position: sticky;
  top: 65px;
  z-index: 40;
  height: 3px;
  background: var(--line-soft);
}
.reading-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--ochre));
  width: 0%;
  transition: width 80ms linear;
}

/* Tabs */
.tab-bar {
  position: sticky;
  top: 68px;
  z-index: 39;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 10px 20px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
  scrollbar-width: none;
}
.tab-bar::-webkit-scrollbar { display: none; }

.tab-btn {
  white-space: nowrap;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tab-btn.active {
  background: var(--green);
  color: #fff;
}
.tab-btn:not(.active):hover {
  background: var(--green-tint);
  color: var(--ink);
}

.chapter-body {
  max-width: var(--reading-width);
  margin: 0 auto;
  padding: 32px 20px 100px;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 220ms ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Summary notes */
.summary-section {
  margin-bottom: 30px;
  padding-bottom: 28px;
  border-bottom: 1px dashed var(--line);
}
.summary-section:last-child { border-bottom: none; }

.summary-section h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.summary-section h3::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
}

.summary-section ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.summary-section li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 12px;
  font-size: 0.98rem;
  line-height: 1.65;
}

.summary-section li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--ochre);
  border-radius: 1px;
  transform: rotate(45deg);
}

.summary-section b { color: var(--green-deep); font-weight: 600; }
[data-theme="dark"] .summary-section b { color: var(--green); }

mark.hit {
  background: var(--ochre-tint);
  color: var(--ink);
  border-radius: 3px;
  padding: 0 2px;
}

/* Revision notes */
.revision-box {
  background: var(--green-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px;
  margin-bottom: 22px;
}

.revision-box h3 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green-deep);
  margin: 0 0 14px;
}

[data-theme="dark"] .revision-box h3 { color: var(--green); }

.fact-list { margin: 0; padding: 0; list-style: none; }
.fact-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.95rem;
  display: flex;
  gap: 10px;
}
.fact-list li:last-child { border-bottom: none; }
.fact-list li .n {
  font-family: var(--font-mono);
  color: var(--ochre);
  flex-shrink: 0;
  font-size: 0.82rem;
  padding-top: 2px;
}

.highlight-box {
  background: var(--ochre-tint);
  border-left: 3px solid var(--ochre);
  border-radius: 8px;
  padding: 16px 18px;
  font-size: 0.92rem;
}
.highlight-box h4 {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--rust);
}
.highlight-box ul { margin: 0; padding-left: 18px; }
.highlight-box li { margin-bottom: 6px; }

/* Questions */
.q-subnav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}
.q-subnav button {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-weight: 600;
}
.q-subnav button.active {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
[data-theme="dark"] .q-subnav button.active { background: var(--green); color: var(--bg); border-color: var(--green); }

.q-group { display: none; }
.q-group.active { display: block; }

.q-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  background: var(--surface-strong);
}

.q-item summary {
  padding: 14px 16px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  list-style: none;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.q-item summary::-webkit-details-marker { display: none; }
.q-item summary .qnum {
  font-family: var(--font-mono);
  color: var(--ochre);
  flex-shrink: 0;
}
.q-item summary::after {
  content: "+";
  margin-left: auto;
  color: var(--ink-soft);
  font-size: 1.1rem;
}
.q-item[open] summary::after { content: "–"; }
.q-item .q-answer {
  padding: 0 16px 16px 42px;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.6;
}

.mcq-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  background: var(--surface);
}
.mcq-card .q-text { font-weight: 600; margin-bottom: 10px; font-size: 0.95rem; }
.mcq-options { display: grid; gap: 8px; }
.mcq-option {
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  min-height: 44px;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  font-size: 0.9rem;
  transition: border var(--transition), background var(--transition);
}
.mcq-option:hover { border-color: var(--green); }
.mcq-option.correct { border-color: var(--green); background: var(--green-tint); font-weight: 600; }
.mcq-option.wrong { border-color: var(--rust); background: var(--rust-tint); }
.mcq-reveal {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--green-deep);
  font-family: var(--font-mono);
}
[data-theme="dark"] .mcq-reveal { color: var(--green); }

.ar-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  background: var(--surface);
}
.ar-card .ar-line { font-size: 0.92rem; margin-bottom: 6px; }
.ar-card .ar-line b { color: var(--ochre); }

.case-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  background: var(--surface);
}
.case-passage {
  background: var(--bg-alt);
  border-radius: 8px;
  padding: 14px;
  font-size: 0.92rem;
  font-style: italic;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

/* Key points */
.kp-grid { display: grid; gap: 16px; }
.kp-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 18px;
  background: var(--surface);
}
.kp-card h4 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.kp-card ul { margin: 0; padding-left: 18px; }
.kp-card li { margin-bottom: 8px; font-size: 0.92rem; }

.kp-card.must h4 { color: var(--green-deep); }
[data-theme="dark"] .kp-card.must h4 { color: var(--green); }
.kp-card.mistake h4 { color: var(--rust); }
.kp-card.tips h4 { color: var(--ochre); }

.keyword-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.keyword-chip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--green-tint);
  color: var(--green-deep);
  padding: 5px 10px;
  border-radius: 6px;
}
[data-theme="dark"] .keyword-chip { color: var(--green); }

/* Nav footer */
.chapter-nav-footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line-soft);
}
.nav-link-card {
  flex: 1;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: 0.85rem;
  transition: border var(--transition), background var(--transition);
}
.nav-link-card:hover { border-color: var(--green); background: var(--green-tint); }
.nav-link-card .dir { color: var(--ink-soft); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
.nav-link-card .title { font-weight: 600; margin-top: 3px; }
.nav-link-card.next { text-align: right; }
.nav-link-card.home { flex: 0 0 auto; display: flex; align-items: center; justify-content: center; }

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease, transform 200ms ease;
  z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* Font size control */
.font-size-control {
  display: flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
}
.font-size-control button {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--ink);
  font-size: 0.9rem;
}
.font-size-control button:hover { background: var(--green-tint); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line-soft);
  padding: 30px 20px 50px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin-top: 10px;
  font-size: 0.8rem;
}
.footer-links a { color: var(--ink-soft); text-decoration: underline; text-underline-offset: 2px; }
.footer-links a:hover { color: var(--green); }
.footer-links .sep { color: var(--line); }

/* Print styles */
@media print {
  .topbar, .tab-bar, .chapter-hero-tools, .reading-progress-track,
  .chapter-nav-footer, .q-subnav, .site-footer { display: none !important; }
  .tab-panel { display: block !important; }
  body { background: #fff; color: #000; }
  .chapter-body { max-width: 100%; }
}

/* Responsive */
@media (max-width: 640px) {
  .topbar-inner { flex-wrap: wrap; }
  .topbar-search { order: 3; max-width: 100%; flex: 1 0 100%; }
  .hero { padding: 44px 16px 30px; }
  .chapter-hero-top { flex-direction: column; }
  .chapter-nav-footer { flex-wrap: wrap; }
  .nav-link-card.home { order: -1; flex: 1 0 100%; }
}

/* Empty / utility states */
.empty-state {
  text-align: center;
  padding: 50px 20px;
  color: var(--ink-soft);
}
.empty-state svg { width: 46px; height: 46px; margin: 0 auto 14px; color: var(--line); }

.badge-progress {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--green-deep);
  background: var(--green-tint);
  padding: 3px 8px;
  border-radius: 6px;
}
[data-theme="dark"] .badge-progress { color: var(--green); }

/* ==========================================================================
   Added components: summary tables, flowchart placeholders, NCERT statement
   box, and match-the-following — styled to match the existing notebook theme
   ========================================================================== */

.summary-table-wrap {
  overflow-x: auto;
  margin: 6px 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 420px;
}
.summary-table th, .summary-table td {
  padding: 9px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}
.summary-table th {
  background: var(--green-tint);
  color: var(--green-deep);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
[data-theme="dark"] .summary-table th { color: var(--green); }
.summary-table tr:last-child td { border-bottom: none; }
.summary-table tr:hover td { background: var(--bg-alt); }

.flowchart-box {
  border: 1px dashed var(--ochre);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 6px 0 18px;
  background: var(--ochre-tint);
  font-size: 0.88rem;
  color: var(--ink);
}
.flowchart-box .fc-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ochre);
  margin-bottom: 8px;
  display: block;
}
.flowchart-steps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.flowchart-steps .fc-step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 12px;
  font-weight: 600;
  font-size: 0.84rem;
}
.flowchart-steps .fc-arrow {
  color: var(--ochre);
  font-weight: 700;
}

.diagram-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 16px 14px;
  margin: 6px 0 18px;
  background: var(--surface);
}
.diagram-box .diagram-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--green-deep);
  margin-bottom: 10px;
  display: block;
}
[data-theme="dark"] .diagram-box .diagram-label { color: var(--green); }
.diagram-box svg {
  width: 100%;
  height: auto;
  display: block;
  max-width: 480px;
  margin: 0 auto;
}
.diagram-box .diagram-caption {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-align: center;
  line-height: 1.5;
}
[data-theme="dark"] .diagram-box svg text { fill: var(--ink); }

.ncert-box {
  background: var(--rust-tint);
  border-left: 3px solid var(--rust);
  border-radius: 8px;
  padding: 16px 18px;
  margin-bottom: 22px;
  font-size: 0.92rem;
}
.ncert-box h4 {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--rust);
}
.ncert-box ul { margin: 0; padding-left: 18px; }
.ncert-box li { margin-bottom: 8px; font-style: italic; }

.match-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  background: var(--surface);
}
.match-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 10px 0;
}
.match-columns h5 {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}
.match-columns ol { margin: 0; padding-left: 18px; font-size: 0.88rem; }
.match-columns li { margin-bottom: 8px; }

.about-btn-lg {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 11px 22px;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid var(--green);
  background: var(--green);
  color: #fff;
  margin-top: 10px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.about-btn-lg:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}


/* --- Responsive safety net (added): prevent long unbroken tokens from
   causing horizontal page overflow on narrow screens. Additive only —
   does not alter existing rules or visible spacing for normal text. --- */
.chapter-body,
.keyword-chip,
.chapter-tag,
.badge-progress,
.home-feature-chip,
.search-result .chip {
  overflow-wrap: break-word;
  word-break: break-word;
}

/* --- Mobile reading-space fix (added): on chapter pages, three stacked
   sticky bars (topbar + progress + tab-bar) ate ~120px of small-screen
   viewport permanently while reading. Below 768px, only the tab-bar
   (the actual in-page navigation) stays pinned; the topbar and progress
   track scroll away naturally but remain reachable by scrolling up.
   Scoped to chapter pages only (:has(.tab-bar) — tab-bar exists only on
   chapter pages) so homepage/subject/listing pages are unaffected.
   No navigation is removed — only made non-sticky. Additive, CSS-only,
   no animation, desktop (≥769px) layout is untouched. --- */
@media (max-width: 768px) {
  body:has(.tab-bar) .topbar { position: static; }
  .reading-progress-track { position: static; top: auto; }
  .tab-bar { top: 0; }
}