:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --accent: #0891b2;
  --accent-light: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #0891b2, #0d9488);
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --success: #059669;
  --success-bg: #ecfdf5;
  --warning: #d97706;
  --warning-bg: #fffbeb;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -5px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 40px -8px rgba(0,0,0,0.12);
  --max-width: 1120px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }

/* ===== Header ===== */
.site-header {
  background: rgba(15,23,42,0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  height: 60px;
  gap: 32px;
}

.site-logo {
  font-size: 0;
  font-weight: 700;
  color: white;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.3px;
}

.site-logo:hover { color: white; opacity: 0.9; text-decoration: none; }

.site-logo img {
  display: block;
}

.main-nav { display: flex; gap: 2px; margin-left: auto; }

.main-nav a {
  color: rgba(255,255,255,0.65);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--transition);
  letter-spacing: 0.2px;
}

.main-nav a:hover {
  color: white;
  background: rgba(255,255,255,0.08);
  text-decoration: none;
}

.main-nav a.active {
  color: white;
  background: rgba(255,255,255,0.12);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  background: linear-gradient(135deg, #0f172a 0%, #1a2744 50%, #0f2937 100%);
  padding: 80px 24px 72px;
  text-align: center;
  overflow: hidden;
}

.hero-bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(8,145,178,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 30%, rgba(13,148,136,0.06) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(6,182,212,0.04) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 100px;
  font-size: 13px;
  color: rgba(255,255,255,0.75);
  font-weight: 500;
  margin-bottom: 20px;
  letter-spacing: 0.3px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  color: white;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero-highlight {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
  max-width: 540px;
  margin: 0 auto;
}

/* Hero Responsive */
@media (max-width: 768px) {
  .hero { padding: 60px 20px 56px; }
  .hero h1 { font-size: 28px; }
  .hero p { font-size: 15px; }
}

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Region Cards ===== */
.region-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  padding: 56px 0 80px;
}

.region-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.region-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
  border-color: transparent;
}

.region-card-top {
  padding: 24px 24px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: linear-gradient(135deg, var(--card-color, #0891b2), color-mix(in srgb, var(--card-color, #0891b2) 70%, #000));
}

.region-flag {
  font-size: 36px;
  line-height: 1;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
}

.region-card-title-group {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.region-name {
  font-size: 20px;
  font-weight: 700;
  color: white;
  line-height: 1.2;
}

.region-name-en {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  font-weight: 400;
}

.region-card-body {
  padding: 20px 24px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.region-card-body p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1;
}

.region-card-meta {
  display: flex;
  gap: 12px;
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.region-card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.region-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: white;
  background: var(--accent-gradient);
  transition: all var(--transition);
  align-self: flex-start;
}

.region-card-link:hover {
  color: white;
  text-decoration: none;
  box-shadow: 0 4px 12px rgba(8,145,178,0.35);
  transform: translateX(2px);
}

.region-card-link svg {
  transition: transform var(--transition);
}

.region-card-link:hover svg {
  transform: translateX(3px);
}

/* ===== Region Page Header ===== */
.region-page-header {
  padding: 36px 0 28px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13.5px;
  color: var(--text-muted);
  margin-bottom: 16px;
  transition: color var(--transition);
}

.back-link:hover { color: var(--accent); text-decoration: none; }

.region-page-header h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.region-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.6;
}

.source-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.source-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  transition: all var(--transition);
}

.source-badge.official {
  background: #eff6ff;
  color: #1d4ed8;
  border: 1px solid #dbeafe;
}

.source-badge.official:hover {
  background: #dbeafe;
  border-color: #93c5fd;
}

/* ===== Update Info ===== */
.update-info {
  text-align: center;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 28px;
}

/* ===== Sidebar Layout ===== */
.region-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 28px;
  padding-bottom: 80px;
}

.sidebar-nav {
  position: sticky;
  top: 84px;
  align-self: start;
}

.sidebar-nav-list {
  list-style: none;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.sidebar-nav-item { border-bottom: 1px solid var(--border-light); }
.sidebar-nav-item:last-child { border-bottom: none; }

.sidebar-nav-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  font-size: 13.5px;
  color: var(--text);
  transition: all 0.15s;
}

.sidebar-nav-link:hover {
  background: #f8fafc;
  text-decoration: none;
}

.sidebar-nav-link.active {
  background: linear-gradient(90deg, rgba(8,145,178,0.06), transparent);
  color: var(--accent);
  font-weight: 600;
  border-right: 3px solid var(--accent);
}

.sidebar-nav-link .nav-icon { font-size: 16px; }

/* ===== Content Area ===== */
.content-area { min-height: 60vh; }

.panel-content { display: none; }
.panel-content.active { display: block; }

/* ===== Page Section ===== */
.page-section {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  margin-bottom: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.page-section:hover { box-shadow: var(--shadow-md); }

.page-section-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  user-select: none;
}

.page-section-header:hover { background: #fafafa; }

.page-section-header h3 {
  font-size: 17px;
  font-weight: 600;
  flex: 1;
}

.page-section-header .toggle-icon { color: var(--text-muted); }

/* ===== Sub-section ===== */
.sub-section {
  margin-bottom: 28px;
  padding: 20px;
  background: #fafbfc;
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
}

.sub-section:last-child { margin-bottom: 0; }

.sub-section-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
}

/* ===== Verification Banner ===== */
.verification-banner {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--success-bg);
  border: 1px solid #d1fae5;
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--success);
  margin-bottom: 16px;
}

/* ===== Table ===== */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13.5px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.data-table th {
  background: #f8fafc;
  font-weight: 600;
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-light);
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: #f8fafc; }

/* ===== Steps ===== */
.steps-list { counter-reset: step; }

.step-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
}

.step-item:last-child { border-bottom: none; }

.step-number {
  flex-shrink: 0;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--accent-gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(8,145,178,0.3);
}

.step-content { flex: 1; }

.step-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.step-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-meta {
  display: flex;
  gap: 16px;
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--text-muted);
}

.step-meta span { display: flex; align-items: center; gap: 4px; }

/* ===== Lists ===== */
.info-list {
  list-style: none;
  padding: 0;
}

.info-list li {
  padding: 7px 0 7px 22px;
  position: relative;
  font-size: 13.5px;
  line-height: 1.6;
}

.info-list li::before {
  content: "→";
  position: absolute;
  left: 2px;
  color: var(--accent);
  font-weight: 500;
}

/* ===== Note Block ===== */
.note-block {
  background: var(--warning-bg);
  border-left: 4px solid var(--warning);
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 13.5px;
  color: #92400e;
  margin: 12px 0;
}

/* ===== Source Link ===== */
.source-link {
  font-size: 12px;
  color: var(--text-muted);
  display: inline-block;
  margin-top: 2px;
}

.source-link:hover { color: var(--accent); }

/* ===== Footer ===== */
.site-footer {
  background: var(--primary);
  padding: 48px 0 32px;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
}

.footer-col h4 {
  color: white;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.3px;
}

.footer-col p, .footer-col a {
  font-size: 13px;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
}

.footer-col a:hover { color: white; }

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 24px 0;
  margin-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 12.5px;
  text-align: center;
  color: rgba(255,255,255,0.35);
}

/* ===== Loading ===== */
.loading {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
}

.loading-spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto 12px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .region-layout {
    grid-template-columns: 1fr;
  }
  .sidebar-nav {
    position: static;
  }
  .sidebar-nav-list {
    display: flex;
    overflow-x: auto;
    gap: 4px;
    border-radius: var(--radius);
  }
  .sidebar-nav-item {
    border-bottom: none;
    flex-shrink: 0;
  }
  .region-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .header-inner { height: auto; padding: 12px 20px; gap: 16px; }
  .main-nav { margin-left: 0; overflow-x: auto; }
  .region-page-header h1 { font-size: 24px; }
}

/* ===== Overview Table ===== */
.overview-table-wrap {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.overview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.overview-table th {
  background: #f8fafc;
  font-weight: 600;
  text-align: left;
  padding: 14px 16px;
  border-bottom: 2px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.overview-table td {
  padding: 16px;
  border-bottom: 1px solid var(--border-light);
  vertical-align: top;
  line-height: 1.6;
}

.overview-table tr:last-child td { border-bottom: none; }
.overview-table tr:hover td { background: #fafbfc; }

.overview-adv-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.overview-adv-list li {
  padding: 2px 0 2px 16px;
  position: relative;
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.overview-adv-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: 700;
}

.overview-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.overview-link:hover { text-decoration: underline; }

/* ===== Glossary ===== */
.glossary-item {
  padding: 16px;
  border-bottom: 1px solid var(--border-light);
  transition: background 0.15s;
}

.glossary-item:last-child { border-bottom: none; }
.glossary-item:hover { background: #fafafa; }

.glossary-term-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.glossary-term {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
}

.glossary-full {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 400;
}

.glossary-badges { display: flex; gap: 4px; margin-left: auto; }

.glossary-region {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: #f1f5f9;
  color: var(--text-secondary);
}

.glossary-def {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.glossary-related-tag {
  display: inline-block;
  font-size: 11.5px;
  padding: 2px 8px;
  border-radius: 4px;
  background: #eff6ff;
  color: #1d4ed8;
  margin: 2px;
}

.glossary-cats { display: flex; flex-direction: column; gap: 16px; }

/* ===== Updates ===== */
.updates-list { display: flex; flex-direction: column; gap: 16px; }

.update-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.update-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.update-card-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.update-category {
  font-size: 11.5px;
  padding: 3px 10px;
  border-radius: 100px;
  background: var(--accent-gradient);
  color: white;
  font-weight: 500;
}

.update-date {
  font-size: 12.5px;
  color: var(--text-muted);
}

.update-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text);
}

.update-summary {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
}

.update-source-link {
  font-size: 12.5px;
  color: var(--accent);
  font-weight: 500;
}

.update-source-link:hover { text-decoration: underline; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }