/* ═══════════════════════════════════════════════════════
   MIN-0  ·  Language Reference  ·  Shared Stylesheet
   Aesthetic: Deep-space codex / alien terminal
═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=Oxanium:wght@300;400;600;700;800&family=IBM+Plex+Mono:wght@400;600&display=swap');

/* ── Tokens ─────────────────────────────────────────── */
:root {
  --bg:        #060b14;
  --bg2:       #0b1422;
  --bg3:       #101c2e;
  --surface:   #0f1f35;
  --surface2:  #152843;
  --border:    #1e3a58;
  --border2:   #2a4f75;

  --teal:      #00d4ff;
  --teal-dim:  #0096cc;
  --gold:      #e8b84b;
  --gold-dim:  #a07820;
  --green:     #00e5a0;
  --red:       #ff4d6d;
  --purple:    #a78bfa;

  --text:      #c8dff0;
  --text-dim:  #6a8fad;
  --text-mute: #3a5570;

  --font-body: 'Oxanium', sans-serif;
  --font-mono: 'IBM Plex Mono', 'Share Tech Mono', monospace;

  --glow-teal: 0 0 20px rgba(0,212,255,0.25), 0 0 60px rgba(0,212,255,0.1);
  --glow-gold: 0 0 20px rgba(232,184,75,0.3);
}

/* ── Reset ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Scrollbar ──────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }

/* ── Background grid ────────────────────────────────── */
body::before {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.18;
  pointer-events: none;
}
body::after {
  content: '';
  position: fixed; inset: 0; z-index: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(0,212,255,0.07) 0%, transparent 60%);
  pointer-events: none;
}

/* ── Navigation ─────────────────────────────────────── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(6,11,20,0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  display: flex; align-items: center; gap: 0;
}
.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--teal);
  text-decoration: none;
  padding: 14px 28px 14px 0;
  letter-spacing: 0.12em;
  text-shadow: var(--glow-teal);
  border-right: 1px solid var(--border);
  margin-right: 12px;
  white-space: nowrap;
}
.nav-brand span { color: var(--gold); }
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  padding: 8px 16px;
  border-radius: 4px;
  transition: all 0.2s;
  text-transform: uppercase;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--teal);
  background: rgba(0,212,255,0.08);
}
.nav-spacer { flex: 1; }
.nav-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-mute);
  letter-spacing: 0.05em;
}

/* ── Page wrapper ───────────────────────────────────── */
.page { position: relative; z-index: 1; }

/* ── Hero (index) ───────────────────────────────────── */
.hero {
  min-height: calc(100vh - 53px);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 80px 24px;
  text-align: center;
  position: relative;
}
.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--teal-dim);
  text-transform: uppercase;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeUp 0.8s 0.1s forwards;
}
.hero-title {
  font-size: clamp(5rem, 18vw, 11rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, var(--teal) 50%, var(--gold) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeUp 0.8s 0.25s forwards;
}
.hero-sub {
  font-size: clamp(0.9rem, 2.5vw, 1.2rem);
  color: var(--text-dim);
  max-width: 540px;
  margin: 0 auto 48px;
  font-weight: 300;
  opacity: 0;
  animation: fadeUp 0.8s 0.4s forwards;
}
.hero-stats {
  display: flex; gap: 40px; justify-content: center;
  margin-bottom: 56px;
  opacity: 0;
  animation: fadeUp 0.8s 0.55s forwards;
}
.stat { text-align: center; }
.stat-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--teal);
  text-shadow: var(--glow-teal);
  display: block;
}
.stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-mute);
}
.hero-ctas {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.7s forwards;
}
.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--teal);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 14px 28px;
  border-radius: 4px;
  text-decoration: none;
  text-transform: uppercase;
  transition: all 0.2s;
  box-shadow: var(--glow-teal);
}
.btn-primary:hover {
  background: #fff;
  box-shadow: 0 0 40px rgba(0,212,255,0.5);
  transform: translateY(-2px);
}
.btn-secondary {
  display: inline-flex; align-items: center; gap: 10px;
  background: transparent;
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 13px 28px;
  border-radius: 4px;
  border: 1px solid var(--gold-dim);
  text-decoration: none;
  text-transform: uppercase;
  transition: all 0.2s;
}
.btn-secondary:hover {
  background: rgba(232,184,75,0.1);
  border-color: var(--gold);
  box-shadow: var(--glow-gold);
  transform: translateY(-2px);
}

/* ── Info cards (index) ─────────────────────────────── */
.cards-section {
  padding: 80px 24px;
  max-width: 1100px;
  margin: 0 auto;
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: var(--teal-dim);
  text-transform: uppercase;
  margin-bottom: 40px;
  text-align: center;
}
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--teal), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover { border-color: var(--border2); transform: translateY(-4px); }
.card:hover::before { opacity: 1; }
.card-icon { font-size: 1.8rem; margin-bottom: 16px; }
.card-title {
  font-size: 1rem; font-weight: 700;
  color: #fff; margin-bottom: 10px;
  letter-spacing: 0.03em;
}
.card-text { font-size: 0.87rem; color: var(--text-dim); line-height: 1.7; }

/* ── Lore section ───────────────────────────────────── */
.lore-section {
  padding: 80px 24px;
  max-width: 760px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
}
.lore-section h2 {
  font-size: 1.6rem; font-weight: 700;
  color: var(--gold);
  text-shadow: var(--glow-gold);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.lore-section p {
  color: var(--text-dim);
  line-height: 1.85;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

/* ── Textbook layout ────────────────────────────────── */
.textbook-wrap {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: calc(100vh - 53px);
  max-width: 1300px;
  margin: 0 auto;
}
.tb-sidebar {
  position: sticky; top: 53px;
  height: calc(100vh - 53px);
  overflow-y: auto;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 24px 0;
}
.tb-sidebar::-webkit-scrollbar { width: 4px; }
.tb-sidebar::-webkit-scrollbar-thumb { background: var(--border); }
.tb-sidebar-title {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-mute);
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}
.tb-sidebar a {
  display: block;
  padding: 7px 20px;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
  transition: all 0.15s;
  border-left: 2px solid transparent;
  line-height: 1.4;
}
.tb-sidebar a:hover { color: var(--teal); background: rgba(0,212,255,0.04); }
.tb-sidebar a.active { color: var(--teal); border-left-color: var(--teal); background: rgba(0,212,255,0.06); }
.tb-sidebar a.ch-heading {
  font-weight: 600; color: var(--text);
  font-size: 0.78rem; margin-top: 4px;
}
.tb-sidebar a.sub-heading {
  padding-left: 32px;
  font-size: 0.76rem;
  color: var(--text-mute);
}

/* ── Textbook content ───────────────────────────────── */
.tb-content {
  padding: 48px 56px 80px;
  max-width: 860px;
}

/* Chapter headings */
.chapter-block { margin-bottom: 64px; }
.chapter-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--teal-dim);
  margin-bottom: 8px;
}
h1.chapter-title {
  font-size: 2rem; font-weight: 800;
  color: #fff;
  border-bottom: 2px solid var(--teal);
  padding-bottom: 12px;
  margin-bottom: 28px;
  letter-spacing: 0.02em;
  text-shadow: 0 0 40px rgba(0,212,255,0.2);
}
h2.section-title {
  font-size: 1.2rem; font-weight: 700;
  color: var(--gold);
  margin: 36px 0 14px;
  letter-spacing: 0.03em;
}
h3.subsection-title {
  font-size: 1rem; font-weight: 600;
  color: var(--teal);
  margin: 24px 0 10px;
}

/* Body text */
.tb-content p {
  color: var(--text-dim);
  margin-bottom: 14px;
  line-height: 1.8;
  font-size: 0.93rem;
}

/* Code */
code, .code {
  font-family: var(--font-mono);
  background: rgba(0,212,255,0.06);
  color: var(--teal);
  padding: 1px 7px;
  border-radius: 3px;
  font-size: 0.88em;
  border: 1px solid rgba(0,212,255,0.12);
}
.code-block {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-left: 3px solid var(--teal);
  border-radius: 4px;
  padding: 14px 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--teal);
  margin: 12px 0;
  overflow-x: auto;
  white-space: pre;
}

/* Example */
.example {
  background: rgba(0,229,160,0.04);
  border: 1px solid rgba(0,229,160,0.15);
  border-radius: 4px;
  padding: 10px 16px;
  margin: 8px 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  display: flex; gap: 12px; align-items: baseline;
}
.ex-label { color: var(--green); font-weight: 600; flex-shrink: 0; min-width: 80px; }
.ex-content { color: #a8d8c0; }

/* Note */
.note {
  background: rgba(232,184,75,0.05);
  border: 1px solid rgba(232,184,75,0.2);
  border-left: 3px solid var(--gold);
  border-radius: 4px;
  padding: 12px 18px;
  margin: 14px 0;
  font-size: 0.86rem;
  color: #c8a860;
}
.note-icon { color: var(--gold); margin-right: 8px; }

/* Tables */
.tb-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 0.85rem;
}
.tb-table th {
  background: var(--surface2);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--border);
}
.tb-table td {
  padding: 8px 14px;
  border: 1px solid var(--border);
  color: var(--text-dim);
  vertical-align: top;
}
.tb-table tr:nth-child(odd) td { background: var(--bg3); }
.tb-table tr:nth-child(even) td { background: var(--bg2); }
.tb-table tr:hover td { background: rgba(0,212,255,0.04); }
.tb-table td code { background: transparent; padding: 0; border: none; }
.tb-table td:last-child { font-family: var(--font-mono); color: var(--teal); }

/* Bullet list */
.tb-content ul {
  margin: 10px 0 16px 20px;
  color: var(--text-dim);
  font-size: 0.92rem;
}
.tb-content ul li { margin-bottom: 5px; padding-left: 4px; }
.tb-content ul li::marker { color: var(--teal); }

/* ── Dictionary layout ──────────────────────────────── */
.dict-wrap {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0;
}
.dict-header {
  padding: 40px 48px 0;
  border-bottom: 1px solid var(--border);
}
.dict-header h1 {
  font-size: 2rem; font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}
.dict-header p { color: var(--text-mute); font-size: 0.85rem; margin-bottom: 20px; }

.dict-controls {
  display: flex; gap: 16px; align-items: center;
  padding: 16px 0;
  flex-wrap: wrap;
}
.search-wrap {
  position: relative; flex: 1; min-width: 240px; max-width: 400px;
}
.search-wrap input {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 9px 14px 9px 38px;
  outline: none;
  transition: border-color 0.2s;
}
.search-wrap input:focus { border-color: var(--teal); }
.search-wrap input::placeholder { color: var(--text-mute); }
.search-icon {
  position: absolute; left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-mute); font-size: 0.85rem;
  pointer-events: none;
}
.tab-group { display: flex; gap: 4px; }
.tab-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  padding: 8px 18px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
}
.tab-btn:hover { color: var(--teal); border-color: var(--border2); }
.tab-btn.active {
  background: rgba(0,212,255,0.1);
  border-color: var(--teal);
  color: var(--teal);
}
.dict-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-mute);
  margin-left: auto;
}

/* Alpha jump nav */
.alpha-nav {
  padding: 12px 48px;
  border-bottom: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 4px;
  background: var(--bg2);
  position: sticky; top: 53px; z-index: 10;
}
.alpha-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  width: 32px; height: 28px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.15s;
}
.alpha-btn:hover, .alpha-btn.has-entries:hover {
  background: rgba(0,212,255,0.08);
  border-color: var(--teal);
  color: var(--teal);
}
.alpha-btn.has-entries { color: var(--text-dim); border-color: var(--border2); }
.alpha-btn.no-entries { opacity: 0.3; cursor: default; }

/* Dictionary entries */
.dict-body { padding: 24px 48px 80px; }
.letter-section { margin-bottom: 32px; }
.letter-header {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--teal);
  text-shadow: var(--glow-teal);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.dict-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 6px;
}
.dict-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 7px 12px;
  transition: all 0.15s;
  gap: 8px;
}
.dict-entry:hover {
  border-color: var(--border2);
  background: var(--surface);
}
.entry-word {
  font-size: 0.84rem;
  color: var(--text);
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.entry-code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--teal);
  flex-shrink: 0;
  letter-spacing: 0.04em;
}
.dict-entry.hidden { display: none; }

/* No results */
.no-results {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  display: none;
}

/* ── Footer ─────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 48px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
  background: var(--bg2);
  position: relative; z-index: 1;
}
.footer-brand {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--teal);
  letter-spacing: 0.1em;
}
.footer-note {
  font-size: 0.78rem;
  color: var(--text-mute);
}

/* ── Animations ─────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}
.blink { animation: pulse 1.4s ease-in-out infinite; }

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 900px) {
  .textbook-wrap { grid-template-columns: 1fr; }

  /* Sidebar becomes a horizontal scrollable chapter strip */
  .tb-sidebar {
    position: sticky;
    top: 53px;
    z-index: 10;
    height: auto;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
    background: var(--bg2);
    /* smooth momentum scroll on iOS */
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .tb-sidebar::-webkit-scrollbar { display: none; }

  /* Hide the "Contents" title label in strip mode */
  .tb-sidebar-title { display: none; }

  /* All links become horizontal tabs */
  .tb-sidebar a,
  .tb-sidebar a.ch-heading,
  .tb-sidebar a.sub-heading {
    display: inline-block;
    flex-shrink: 0;
    padding: 10px 16px;
    font-size: 0.75rem;
    white-space: nowrap;
    border-left: none;
    border-bottom: 2px solid transparent;
    line-height: 1.2;
  }
  /* Hide sub-headings in the strip — too many items */
  .tb-sidebar a.sub-heading { display: none; }

  .tb-sidebar a.active {
    color: var(--teal);
    border-left-color: transparent;
    border-bottom-color: var(--teal);
    background: rgba(0,212,255,0.06);
  }

  .tb-content { padding: 28px 20px 60px; }
  .dict-header, .alpha-nav, .dict-body { padding-left: 20px; padding-right: 20px; }
  .dict-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}
@media (max-width: 600px) {
  nav { padding: 0 16px; }
  .nav-brand { font-size: 1rem; padding: 12px 16px 12px 0; }
  .hero-stats { gap: 24px; }
  .dict-controls { flex-direction: column; align-items: flex-start; }
}

/* ── Translator button (hero) ────────────────────── */
.btn-translator {
  display: inline-flex; align-items: center; gap: 10px;
  background: transparent;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 13px 28px;
  border-radius: 4px;
  border: 1px solid rgba(0,229,160,0.35);
  text-decoration: none;
  text-transform: uppercase;
  transition: all 0.2s;
}
.btn-translator:hover {
  background: rgba(0,229,160,0.08);
  border-color: var(--green);
  box-shadow: 0 0 20px rgba(0,229,160,0.2);
  transform: translateY(-2px);
}

/* ── Translator card on homepage ────────────────── */
.card-translator {
  border-color: rgba(0,229,160,0.2);
  background: linear-gradient(135deg, var(--surface) 0%, rgba(0,229,160,0.04) 100%);
}
.card-translator::before {
  background: linear-gradient(90deg, transparent, var(--green), transparent);
}
.card-cta {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--green);
  text-decoration: none;
  letter-spacing: 0.06em;
  border-bottom: 1px solid rgba(0,229,160,0.3);
  padding-bottom: 2px;
  transition: all 0.2s;
}
.card-cta:hover {
  color: #fff;
  border-bottom-color: var(--green);
}