/* ===== CSS Variables ===== */
:root {
  --bg: #0f0f1a;
  --bg2: #1a1a2e;
  --surface: #16213e;
  --ink: #e8e8f0;
  --muted: #a0a0b8;
  --rule: #2d2d44;
  --accent: #ff0050;
  --accent2: #00f2ea;
  --accent3: #ff6b9d;
  --gold: #ffd700;
  --success: #00d26a;
  --warning: #ffaa00;
}
/* ===== Fonts ===== */
@font-face {
  font-family: 'InstrumentSans';
  src: url('./_shared/fonts/InstrumentSans-Regular.ttf') format('truetype');
  font-weight: 400;
}
@font-face {
  font-family: 'InstrumentSans';
  src: url('./_shared/fonts/InstrumentSans-Bold.ttf') format('truetype');
  font-weight: 700;
}
@font-face {
  font-family: 'Bricolage';
  src: url('./_shared/fonts/BricolageGrotesque-Regular.ttf') format('truetype');
  font-weight: 400;
}
@font-face {
  font-family: 'Bricolage';
  src: url('./_shared/fonts/BricolageGrotesque-Bold.ttf') format('truetype');
  font-weight: 700;
}
@font-face {
  font-family: 'Mono';
  src: url('./_shared/fonts/IBMPlexMono-Regular.ttf') format('truetype');
  font-weight: 400;
}
@font-face {
  font-family: 'WorkSans';
  src: url('./_shared/fonts/WorkSans-Regular.ttf') format('truetype');
  font-weight: 400;
}
@font-face {
  font-family: 'WorkSans';
  src: url('./_shared/fonts/WorkSans-Bold.ttf') format('truetype');
  font-weight: 700;
}
@font-face {
  font-family: 'YoungSerif';
  src: url('./_shared/fonts/YoungSerif-Regular.ttf') format('truetype');
  font-weight: 400;
}
@font-face {
  font-family: 'Outfit';
  src: url('./_shared/fonts/Outfit-Regular.ttf') format('truetype');
  font-weight: 400;
}
@font-face {
  font-family: 'Outfit';
  src: url('./_shared/fonts/Outfit-Bold.ttf') format('truetype');
  font-weight: 700;
}
/* ===== Base ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'WorkSans', 'InstrumentSans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 15px;
}
/* ===== Layout ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}
/* ===== Hero Cover ===== */
.hero {
  position: relative;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: linear-gradient(135deg, #1a0a2e 0%, #2d1b4e 50%, #1a1a2e 100%);
}
.hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url('assets/cover_1280x720.jpg') center/cover no-repeat;
  opacity: 0.25;
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 60px 24px;
}
.hero h1 {
  font-family: 'Bricolage', sans-serif;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  margin-bottom: 12px;
  background: linear-gradient(90deg, var(--accent), var(--accent2), var(--accent3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero .subtitle {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 8px;
}
.hero .tagline {
  font-family: 'Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent2);
  letter-spacing: 2px;
  text-transform: uppercase;
}
.hero .date-badge {
  display: inline-block;
  margin-top: 20px;
  padding: 6px 18px;
  background: rgba(255,0,80,0.15);
  border: 1px solid var(--accent);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--accent);
}
/* ===== Page Layout ===== */
.page-layout {
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
}
/* ===== Sidebar TOC ===== */
.sidebar {
  width: 220px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 24px 16px;
  border-right: 1px solid var(--rule);
  flex-shrink: 0;
  background: var(--bg2);
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 2px; }
.toc-title {
  font-family: 'Bricolage', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}
.toc-sidebar a {
  display: block;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  padding: 8px 10px;
  border-radius: 6px;
  transition: all 0.2s;
  margin-bottom: 2px;
  line-height: 1.5;
}
.toc-sidebar a:hover,
.toc-sidebar a.active {
  color: var(--accent2);
  background: rgba(0,242,234,0.06);
}
.toc-sidebar a::before {
  content: '#';
  color: var(--accent);
  font-family: 'Mono', monospace;
  font-size: 0.7rem;
  margin-right: 6px;
}
/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 16px 24px;
  font-size: 0.85rem;
  color: var(--muted);
  border-bottom: 1px solid var(--rule);
  background: var(--bg2);
}
.breadcrumb a {
  color: var(--accent2);
  text-decoration: none;
  transition: color 0.2s;
}
.breadcrumb a:hover {
  text-decoration: underline;
  color: var(--accent);
}
.breadcrumb .sep {
  margin: 0 8px;
  color: var(--rule);
}
.breadcrumb .current {
  color: var(--ink);
}
/* ===== Main Content ===== */
.main-content {
  flex: 1;
  min-width: 0;
}
.main-content .container {
  max-width: none;
  padding: 0 32px;
}
/* ===== Section Headers ===== */
.section-header {
  text-align: center;
  padding: 60px 0 30px;
}
.section-header h2 {
  font-family: 'Bricolage', sans-serif;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 8px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.section-header h2 .icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.section-header p {
  color: var(--muted);
  font-size: 0.95rem;
}
.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  margin: 16px auto 0;
  border-radius: 2px;
}
/* ===== Cards ===== */
.card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 20px;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.card-title {
  font-family: 'Bricolage', sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent2);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
/* ===== Script Pairs (CN/EN) ===== */
.script-pair {
  background: rgba(0,242,234,0.03);
  border-left: 3px solid var(--accent2);
  padding: 14px 18px;
  margin-bottom: 12px;
  border-radius: 0 8px 8px 0;
}
.script-pair .cn {
  font-size: 0.95rem;
  color: var(--ink);
  margin-bottom: 6px;
  line-height: 1.6;
}
.script-pair .en {
  font-size: 0.88rem;
  color: var(--muted);
  font-style: italic;
  line-height: 1.5;
}
.script-pair .tag {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
  font-family: 'Mono', monospace;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tag-welcome { background: rgba(0,242,234,0.15); color: var(--accent2); }
.tag-interact { background: rgba(255,0,80,0.15); color: var(--accent); }
.tag-sell { background: rgba(255,215,0,0.15); color: var(--gold); }
.tag-urgency { background: rgba(255,107,157,0.15); color: var(--accent3); }
.tag-trust { background: rgba(0,210,106,0.15); color: var(--success); }
.tag-avoid { background: rgba(255,170,0,0.15); color: var(--warning); }
/* ===== Tables ===== */
.table-wrap {
  overflow-x: auto;
  overflow-y: auto;
  max-height: 600px;
  margin: 20px 0;
  border-radius: 8px;
  border: 1px solid var(--rule);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 600px;
}
th {
  background: var(--bg2);
  color: var(--accent2);
  font-weight: 600;
  text-align: left;
  padding: 12px 14px;
  border-bottom: 2px solid var(--rule);
  font-family: 'Bricolage', sans-serif;
}
td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  vertical-align: top;
}
tr:hover td { background: rgba(255,0,80,0.03); }
/* ===== Tips / Callouts ===== */
.tip {
  background: linear-gradient(135deg, rgba(255,0,80,0.08), rgba(0,242,234,0.05));
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 18px 22px;
  margin: 20px 0;
}
.tip-title {
  font-family: 'Bricolage', sans-serif;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
/* ===== Category Grid ===== */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.cat-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 20px;
  transition: all 0.2s;
}
.cat-card:hover {
  border-color: var(--accent2);
  box-shadow: 0 4px 20px rgba(0,242,234,0.08);
}
.cat-card h4 {
  font-family: 'Bricolage', sans-serif;
  color: var(--accent2);
  margin-bottom: 10px;
  font-size: 1rem;
}
.cat-card ul {
  list-style: none;
  padding: 0;
}
.cat-card li {
  padding: 4px 0;
  color: var(--muted);
  font-size: 0.85rem;
  border-bottom: 1px dashed var(--rule);
}
.cat-card li:last-child { border-bottom: none; }
/* ===== Formula Box ===== */
.formula-box {
  background: var(--bg2);
  border: 1px dashed var(--accent);
  border-radius: 10px;
  padding: 20px;
  margin: 20px 0;
  text-align: center;
}
.formula-box .formula {
  font-family: 'Bricolage', sans-serif;
  font-size: 1.1rem;
  color: var(--accent);
  letter-spacing: 1px;
}
.formula-box .desc {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 8px;
}
/* ===== Progress Steps ===== */
.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0;
}
.step {
  flex: 1;
  min-width: 140px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 14px;
  text-align: center;
}
.step-num {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent3));
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}
.step-desc {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 4px;
}
/* ===== Footer / Sources ===== */
footer {
  background: var(--bg2);
  border-top: 1px solid var(--rule);
  padding: 40px 0;
  margin-top: 60px;
}
footer .sources h2 {
  font-family: 'Bricolage', sans-serif;
  font-size: 1.2rem;
  margin-bottom: 16px;
  color: var(--accent2);
}
footer .sources ol {
  padding-left: 1.2rem;
  font-size: 0.85rem;
  color: var(--muted);
}
footer .sources li {
  margin-bottom: 0.5rem;
  overflow-wrap: break-word;
  word-break: break-all;
}
footer .sources .src-title {
  color: var(--ink);
  word-break: normal;
}
footer .sources .src-url {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.82rem;
  color: var(--accent);
  word-break: break-all;
}
/* ===== Scroll to top ===== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px; height: 44px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 200;
}
.back-to-top.visible { opacity: 1; }
/* ===== Responsive ===== */
@media (max-width: 768px) {
  .page-layout { flex-direction: column; }
  .sidebar { display: none; }
  .main-content .container { padding: 0 16px; }
  .container { padding: 0 16px; }
  .hero { min-height: 300px; }
  .hero-content { padding: 40px 16px; }
  .card { padding: 16px; }
  .cat-grid { grid-template-columns: 1fr; }
  .steps { flex-direction: column; }
  .script-pair { padding: 12px 14px; }
  .breadcrumb { padding: 12px 16px; }
}
/* ===== Print ===== */
@media print {
  .sidebar, .back-to-top, .breadcrumb { display: none; }
  body { background: #fff; color: #000; }
  .card { break-inside: avoid; }
}
/* ===== Inline citations ===== */
sup a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.75em;
  font-weight: 600;
}
sup a:hover { text-decoration: underline; }
/* ===== Highlight key text ===== */
mark.key {
  background: none;
  color: var(--accent2);
  font-weight: 600;
}
/* ===== Section spacing ===== */
section { padding-bottom: 20px; }