:root {
  --text-xs: .62rem;
  --text-sm: .75rem;
  --text-base: .88rem;
  --text-lg: 1rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.6rem;
}
/* ══════════════════════════════════════════════════════════════════
   Word Play — Shared Stylesheet
   ══════════════════════════════════════════════════════════════════ */

/* ─── RESET ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: 'Charter', 'Georgia', 'Cambria', serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* ─── CSS VARIABLES ────────────────────────────────────────────── */
:root {
  --ink: #1A1A1A;
  --paper: #FAFAFA;
  --navy: #1A1A1A;
  --navy-light: #6B6B6B;
  --muted: #9A9A9A;
  --hairline: #E5E5E5;
  --amber: #B8860B;
  --teal: #1A7A8A;
  --accent: #B8860B;
  --accent-dark: #8A6208;
  --cream: #FAFAFA;
  --cream-deep: #F0EDE8;
  --muted-deep: #6B6B6B;
  --border-soft: rgba(26,26,26,0.12);
  --navy-deep: #0D0D0D;
  --navy-mid: #3A3A3A;
  --offwhite: #F5F3EF;
  --green: #2E7D52;
  --red: #C0392B;
  --border: #E5E5E5;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;
}

body.dark {
  --ink: #F0F0F0;
  --paper: #0E0E0E;
  --navy: #F0F0F0;
  --navy-light: #B8B8B8;
  --muted: #9A9A9A;
  --hairline: #2A2A2A;
  --amber: #C9A050;
  --teal: #4AABB8;
  --accent: #C9A050;
  --accent-dark: #A07830;
  --cream-deep: #1A2230;
  --muted-deep: #A8B4C6;
  --border-soft: rgba(255,255,255,0.1);
  --navy-deep: #070C12;
  --navy-mid: #2A3A50;
  --offwhite: #141E2A;
  --green: #4CAF82;
  --red: #E05A4A;
  --cream: #0E0E0E;
}

button { font-family: inherit; -webkit-tap-highlight-color: transparent; border: none; background: none; cursor: pointer; }
input, select, textarea { font-family: inherit; -webkit-tap-highlight-color: transparent; }
a { color: inherit; }

/* ─── GLOBAL HEADER / NAV ──────────────────────────────────────── */
.site-header {
  background: var(--navy);
  color: white;
  padding: 14px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--accent);
}
.site-header-inner {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.site-header a.brand {
  color: white;
  text-decoration: none;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}
.site-header a.brand span {
  color: var(--accent);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-family: var(--font-sans);
  font-weight: 700;
  margin-left: 8px;
  vertical-align: 2px;
}
.site-header .back {
  color: #A8B4C6;
  text-decoration: none;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 4px;
  transition: background 0.15s;
}
.site-header .back:active { background: rgba(255,255,255,0.1); }
.site-header .back.back-link::before { content: '←'; font-size: 1.1rem; }
.site-header .forward-link::after { content: ''; }

/* ─── CONTAINER ─────────────────────────────────────────────────── */
.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 20px 80px;
}
.container.wide { max-width: 920px; }

/* ─── TYPOGRAPHY ───────────────────────────────────────────────── */
h1 {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 4px;
  color: var(--navy);
  line-height: 1.1;
}
h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--navy);
}
h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--navy);
}
.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 6px;
}
.subtitle {
  font-size: 0.95rem;
  color: var(--muted);
  font-style: italic;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--accent);
  margin-bottom: 28px;
}

/* ─── FOOTER ───────────────────────────────────────────────────── */
.site-footer {
  margin-top: 60px;
  padding: 24px 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--font-sans);
  letter-spacing: 1px;
}

@media (min-width: 640px) {
  .container { padding: 44px 40px 80px; }
  h1 { font-size: 3rem; }
}

/* ══════════════════════════════════════════════════════════════════
   DARK MODE — applied via /* Header stays navy-deep */
/* Worksheet container / page backgrounds */
/* Exercise sections */
/* Question items */
/* Inputs */
/* Choice buttons */
/* Submit/results */
/* Slide deck */
/* Headings */
/* Dark toggle — sits on the always-dark site-header; white/translucent in both modes */
.dark-toggle {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.28);
  color: rgba(255,255,255,0.82);
  font-family: var(--font-sans);
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .5px;
  padding: 5px 12px;
  border-radius: 3px;
  cursor: pointer;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.dark-toggle:hover {
  background: rgba(255,255,255,0.10);
  color: white;
}

/* ══════════════════════════════════════════════════════════════
   CHAPTER CARD — canonical design used on all section list pages
   ══════════════════════════════════════════════════════════════ */

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}
.chapter-card {
  background: white;
  border: 1px solid rgba(26,26,26,0.12);
  border-radius: 8px;
  padding: 18px 20px 14px;
  cursor: pointer;
  transition: border-color .2s, box-shadow .2s, transform .15s;
  position: relative;
}
.chapter-card:not(.locked):hover {
  border-color: var(--amber);
  box-shadow: 0 4px 16px rgba(184,134,11,0.12);
  transform: translateY(-1px);
}
.chapter-card.locked {
  background: var(--cream);
  cursor: default;
  opacity: 0.62;
}
.card-num {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 5px;
}
.chapter-card h2 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy);
  margin: 0 0 6px;
  line-height: 1.3;
}
.chapter-card .desc {
  font-size: 0.82rem;
  color: var(--navy-light, var(--muted));
  line-height: 1.5;
  margin-bottom: 12px;
}
.card-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.card-actions a {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 10px;
  border: 1.5px solid var(--hairline);
  border-radius: 3px;
  transition: background .15s, color .15s, border-color .15s;
}
.card-actions a:hover {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.locked-pill {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--navy-light, var(--muted));
  padding: 3px 8px;
  background: rgba(26,26,26,0.06);
  border-radius: 3px;
}
/* Section page layout */
.section-page { max-width: 960px; margin: 0 auto; padding: 24px 20px 48px; }
.section-title {
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--amber);
  margin: 32px 0 14px;
}
.progress-strip {
  background: white;
  border: 1px solid rgba(26,26,26,0.12);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 28px;
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}
.prog-item { text-align: center; }
.prog-val {
  font-family: var(--font-sans);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1;
}
.prog-label {
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--navy-light, var(--muted));
  margin-top: 3px;
}

/* Breadcrumb */
.breadcrumb {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--navy-light, var(--muted));
  margin: 0 auto 20px;
  max-width: 800px;
  padding: 8px 20px 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { opacity: 0.5; }

/* Dark mode for cards */
/* ══════════════════════════════════════════════════════════════
   CHAPTER PAGE LAYOUT — consistent max-width and spacing
   ══════════════════════════════════════════════════════════════ */

/* All chapter content containers */
.container,
.slide-container,
.worksheet-container,
.game-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

/* Chapter page h1 — consistent sizing */
.chapter-h1,
.container > h1,
.slide-container > h1,
.worksheet-container > h1 {
  font-size: 2rem;
  line-height: 1.15;
  color: var(--navy);
  margin: 16px 0 6px;
}

/* Chapter-num pill — the "Ch 1" / "V3" label */
.chapter-num {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: 4px;
}

/* Subtitle line below H1 */
.chapter-subtitle {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--navy-light, var(--muted));
  margin: 0 0 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(26,26,26,0.1);
}

/* ── Dark mode updates ── */
/* ══════════════════════════════════════════════════════════════
   PRINT — hide chrome, show content
   ══════════════════════════════════════════════════════════════ */
@media print {
  .site-header,
  .chapter-nav,
  .breadcrumb,
  .dark-toggle,
  .check-bar,
  .site-footer,
  .no-print {
    display: none !important;
  }
  body {
    background: white !important;
    color: #000 !important;
    font-size: 11pt;
  }
  .container,
  .exercise,
  .slide-card {
    max-width: 100% !important;
    margin: 0 !important;
    padding: 0 !important;
  }
  .slide { page-break-inside: avoid; }
  .q { page-break-inside: avoid; }
  a { color: inherit !important; text-decoration: none !important; }
}

/* ── Dark mode extras ── */
/* ── Worksheet corrective feedback ── */
.q.correct { background: rgba(39,174,96,0.04); border-radius: 6px; }
.q.wrong { background: rgba(192,57,43,0.04); border-radius: 6px; }
.correct-answer { border-color: #27ae60 !important; background: rgba(39,174,96,0.06) !important; }
.wrong-answer   { border-color: #c0392b !important; background: rgba(192,57,43,0.06) !important; }
.ws-feedback { display: block; margin-top: 4px; }

/* ── A1 vocabulary card ── */
.vocab-card {
  border: 1px solid var(--hairline);
  border-radius: 8px;
  padding: 18px 20px;
  background: var(--paper);
  cursor: pointer;
  transition: border-color .15s;
}
.vocab-card:hover { border-color: var(--ink); }
.vocab-card .card-num { color: var(--amber); }

/* ── Chapter card complete state ── */
.chapter-card.complete {
  border-color: var(--amber);
  background: rgba(184,134,11,0.04);
}
/* ── Worksheet corrective feedback (if not already present) ── */
.q.correct { background: rgba(39,174,96,0.04); border-radius: 6px; }
.q.wrong   { background: rgba(192,57,43,0.04); border-radius: 6px; }

/* ── Additional mobile breakpoints ── */
@media (max-width: 480px) {
  .breadcrumb { font-size: .72rem; }
  h1 { font-size: 2rem; }
  .container { padding: 28px 16px 60px; }
}
@media (max-width: 380px) {
  }



/* ── Section jump — card style ──────────────────────────────── */
.section-jump {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.section-jump a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: var(--paper);
  border: 1.5px solid var(--hairline);
  border-radius: 6px;
  font-family: var(--font-sans);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  transition: border-color .15s, background .15s;
}
.section-jump a:hover {
  border-color: var(--amber);
  background: rgba(184,134,11,0.05);
}
.section-jump a.fce-jump {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.section-jump a.fce-jump:hover {
  opacity: .85;
}

/* ── Writing Grader Feedback Panel ─────────────────────────────── */
.writing-feedback {
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 0;
  margin-top: 16px;
  overflow: hidden;
  font-family: var(--font-sans);
  font-size: .82rem;
}
.wg-header {
  background: var(--cream-deep);
  padding: 10px 14px;
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--hairline);
}
.wg-section {
  padding: 10px 14px;
  border-bottom: 1px solid var(--hairline);
}
.wg-section:last-child { border-bottom: 0; }
.wg-section-head {
  font-weight: 700;
  font-size: .72rem;
  letter-spacing: .5px;
  margin-bottom: 6px;
  color: var(--ink);
}
.wg-pos .wg-section-head { color: var(--green); }
.wg-issues .wg-section-head { color: var(--red); }
.wg-tips .wg-section-head { color: var(--amber); }
.wg-item {
  padding: 4px 0 4px 12px;
  border-left: 2px solid var(--hairline);
  margin-bottom: 5px;
  color: var(--ink);
  line-height: 1.5;
  font-size: .82rem;
}
.wg-pos .wg-item { border-left-color: var(--green); }
.wg-warn { border-left-color: var(--amber) !important; }
.wg-error { border-left-color: var(--red) !important; color: var(--red); }
.wg-tips .wg-item { border-left-color: var(--amber); }

/* Word counter pill */
.wc-pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-family: var(--font-sans);
  font-size: .72rem;
  font-weight: 700;
  background: var(--hairline);
  color: var(--muted);
  transition: background .3s, color .3s;
}
.wc-pill.good  { background: rgba(46,125,82,.15); color: var(--green); }
.wc-pill.warn  { background: rgba(184,134,11,.15); color: var(--amber); }
.wc-pill.short { background: rgba(192,57,43,.12); color: var(--red); }

/* ── Card actions: first link = primary button, others = text links ──── */
.card-actions a:first-child {
  background: transparent;
  border-color: var(--hairline);
  color: var(--ink);
}
.card-actions a:not(:first-child) {
  border-color: transparent;
  color: var(--muted);
  padding: 4px 6px;
}
.card-actions a:not(:first-child):hover {
  background: transparent;
  border-color: transparent;
  color: var(--ink);
}

/* ── Context reading block (worksheets) ─────────────── */
.reading-context {
  background: var(--cream-deep);
  border-left: 3px solid var(--amber);
  border-radius: 4px;
  padding: 14px 18px;
  margin-bottom: 18px;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--ink);
  font-family: Georgia, serif;
}

/* ─── WRITING RUBRIC ─────────────────────────────────────────── */
.wg-rubric {
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline);
  background: var(--cream-deep);
}
.wg-rubric-title {
  font-family: var(--font-sans);
  font-size: .65rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 10px;
}
.wg-rubric-grid { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.wg-rubric-row  { display: flex; align-items: center; gap: 10px; }
.wg-rubric-label {
  font-family: var(--font-sans);
  font-size: .72rem;
  font-weight: 700;
  color: var(--ink);
  min-width: 90px;
}
.wg-rubric-bar {
  flex: 1;
  height: 6px;
  background: var(--hairline);
  border-radius: 3px;
  overflow: hidden;
}
.wg-rubric-fill {
  height: 100%;
  border-radius: 3px;
  transition: width .5s ease;
}
.wg-rubric-score {
  font-family: var(--font-sans);
  font-size: .72rem;
  font-weight: 800;
  min-width: 30px;
  text-align: right;
}
.wg-rubric-total {
  font-family: var(--font-sans);
  font-size: .75rem;
  color: var(--muted);
  text-align: right;
}
/* ── Dark mode: additional text legibility fixes ── */
/* Preserve dark text on amber/navy buttons sitewide */


/* ══════════════════════════════════════════════════════════════════
   DARK MODE — Header, footer, common elements (Batch 21)
   ══════════════════════════════════════════════════════════════════ */

body.dark .site-header {
  background: #000000 !important;
  border-bottom-color: rgba(255,255,255,.1) !important;
}
body.dark .site-header .brand,
body.dark .site-header .brand * { color: #FFFFFF !important; }
body.dark .site-header .back,
body.dark .site-header .back-link { color: var(--teal) !important; }
body.dark .dark-toggle {
  background: rgba(255,255,255,.08) !important;
  color: #F0F0F0 !important;
  border-color: rgba(255,255,255,.2) !important;
}

body.dark h1 { color: #FFFFFF !important; }
body.dark p  { color: #E0E8F0 !important; }
body.dark .chapter-num      { color: var(--amber) !important; }
body.dark .chapter-subtitle { color: #B8C8D8 !important; }
body.dark .chapter-nav { background: rgba(255,255,255,.04) !important; }
body.dark .chapter-nav-btn {
  color: #C8D4E0 !important;
  background: transparent !important;
}
body.dark .chapter-nav-btn.active {
  color: var(--amber) !important;
  border-bottom-color: var(--amber) !important;
}
body.dark .chapter-nav-btn:hover { color: #FFFFFF !important; }

body.dark .breadcrumb { color: #98A8B8 !important; }
body.dark .breadcrumb a { color: var(--teal) !important; }
body.dark .breadcrumb strong { color: #FFFFFF !important; }
body.dark .breadcrumb span { color: #98A8B8 !important; }

body.dark .site-footer { color: #98A8B8 !important; }

/* Preserve amber/navy CTA buttons */
body.dark a[style*="background:var(--amber)"],
body.dark a[style*="background: var(--amber)"],
body.dark button[style*="background:var(--amber)"] {
  color: #1A1A1A !important;
  background: var(--amber) !important;
}
body.dark a[style*="background:var(--navy)"],
body.dark button[style*="background:var(--navy)"] {
  color: #FFFFFF !important;
}

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* ══ BACK TO TOP BUTTON ═══════════════════════════════════════════ */
#back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--amber);
  color: #1A1A1A;
  border: none;
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,.25);
  z-index: 9999;
  transition: opacity .2s;
  font-family: system-ui;
}
#back-to-top:hover { background: #D4B060; transform: translateY(-2px); }
#back-to-top.visible { display: flex; }
body.dark #back-to-top { background: var(--amber); color: #1A1A1A; }
@media (max-width: 480px) {
  #back-to-top { width: 40px; height: 40px; bottom: 16px; right: 16px; }
}