:root {
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'Plus Jakarta Sans', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --bg-primary: #fefdfb;
  --bg-secondary: #f8f6f3;
  --bg-tertiary: #f0ede8;
  --bg-card: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #7a7a7a;
  --border-color: #e8e4de;
  --accent-primary: #0066cc;
  --accent-secondary: #00994d;
  --accent-warning: #cc7700;
  --accent-danger: #cc3333;
  --accent-gold: #b8860b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
}
[data-theme="dark"] {
  --bg-primary: #0d0d0d;
  --bg-secondary: #141414;
  --bg-tertiary: #1a1a1a;
  --bg-card: #1c1c1c;
  --text-primary: #f5f5f5;
  --text-secondary: #c0c0c0;
  --text-muted: #808080;
  --border-color: #2a2a2a;
  --accent-primary: #4da3ff;
  --accent-secondary: #4dcc80;
  --accent-warning: #ffaa33;
  --accent-danger: #ff6666;
  --accent-gold: #d4a017;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 400; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
a { color: var(--accent-primary); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.8; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(254, 253, 251, 0.95);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
}
[data-theme="dark"] .nav { background: rgba(13, 13, 13, 0.95); }
.nav-inner {
  display: flex; align-items: center; gap: 16px;
  padding: 14px 24px; max-width: 1400px; margin: 0 auto;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-display); font-size: 1.5rem;
  color: var(--text-primary); white-space: nowrap;
}
.nav-logo span { color: var(--accent-secondary); }
.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-link {
  padding: 8px 14px; color: var(--text-secondary); font-size: 0.85rem;
  font-weight: 500; border-radius: 8px; transition: all 0.2s; white-space: nowrap;
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-tertiary); opacity: 1; }
.nav-link.active { color: var(--accent-primary); font-weight: 600; }
.nav-dropdown { position: relative; }
.nav-dropdown-trigger {
  display: flex; align-items: center; gap: 4px; padding: 8px 12px;
  color: var(--text-secondary); font-size: 0.85rem; font-weight: 500;
  border-radius: 8px; transition: all 0.2s; white-space: nowrap;
  background: none; border: none; cursor: pointer; font-family: inherit;
}
.nav-dropdown-trigger:hover, .nav-dropdown-trigger.active {
  color: var(--text-primary); background: var(--bg-tertiary);
}
.dropdown-arrow { font-size: 0.7rem; transition: transform 0.2s; }
.nav-dropdown:hover .dropdown-arrow { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.15);
  padding: 8px; opacity: 0; visibility: hidden;
  transform: translateY(10px); transition: all 0.2s; z-index: 1000;
}
.nav-dropdown-menu.open, .nav-dropdown:hover .nav-dropdown-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.nav-dropdown-item {
  display: block; padding: 10px 14px; color: var(--text-secondary);
  font-size: 0.9rem; border-radius: 8px; transition: all 0.15s;
}
.nav-dropdown-item:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.mobile-menu-btn {
  display: none; width: 40px; height: 40px; border: 1px solid var(--border-color);
  border-radius: 8px; background: var(--bg-card); cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 4px;
}
.mobile-menu-btn span {
  display: block; width: 18px; height: 2px; background: var(--text-primary); border-radius: 1px;
}
.theme-toggle {
  width: 40px; height: 40px; border: 1px solid var(--border-color);
  border-radius: 10px; background: var(--bg-card); cursor: pointer;
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
}
.theme-toggle:hover { background: var(--bg-tertiary); }
.card {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: 16px; padding: 32px; transition: all 0.3s;
}
.stat-card {
  text-align: center; padding: 20px;
  background: var(--bg-card); border: 1px solid var(--border-color); border-radius: 12px;
}
.stat-value { font-family: var(--font-display); font-size: 2rem; color: var(--accent-primary); }
.stat-label { color: var(--text-muted); font-size: 0.85rem; margin-top: 4px; }
.data-table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.data-table th, .data-table td {
  padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border-color);
}
.data-table th {
  background: var(--bg-secondary); font-weight: 600; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted);
}
.data-table tr:hover { background: var(--bg-secondary); }
.table-responsive { overflow-x: auto; }
.highlight-box {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  border-radius: 12px; padding: 24px; margin: 24px 0;
}
.highlight-box.success { border-left-color: var(--accent-secondary); }
.highlight-box.warning { border-left-color: var(--accent-warning); }
.faq-item {
  border: 1px solid var(--border-color); border-radius: 12px;
  margin-bottom: 12px; overflow: hidden;
}
.faq-question {
  width: 100%; padding: 18px 24px; background: var(--bg-card); border: none;
  text-align: left; font-size: 1rem; font-weight: 600; font-family: var(--font-body);
  cursor: pointer; display: flex; justify-content: space-between; align-items: center;
  color: var(--text-primary); transition: background 0.2s;
}
.faq-question:hover { background: var(--bg-secondary); }
.faq-question::after { content: '+'; font-size: 1.5rem; color: var(--text-muted); }
.faq-item.open .faq-question::after { content: '\2212'; }
.faq-answer {
  padding: 0 24px; max-height: 0; overflow: hidden; transition: all 0.3s;
  color: var(--text-secondary);
}
.faq-item.open .faq-answer { padding: 0 24px 20px; max-height: 500px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px;
  border-radius: 12px; font-weight: 600; font-size: 0.95rem; transition: all 0.2s;
  border: none; cursor: pointer;
}
.btn-primary {
  background: var(--text-primary); color: var(--bg-primary);
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); }
.btn-secondary {
  background: var(--bg-card); color: var(--text-primary); border: 1px solid var(--border-color);
}
.btn-secondary:hover { background: var(--bg-tertiary); }
.footer {
  background: var(--bg-secondary); padding: 40px 0 20px; margin-top: 60px;
}
.footer-bottom {
  text-align: center; padding-top: 20px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted); font-size: 0.85rem;
}
.breadcrumb {
  display: flex; align-items: center; gap: 8px; font-size: 0.85rem;
  color: var(--text-muted); padding: 16px 0;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent-primary); }
@media (max-width: 1100px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute;
    top: 100%; left: 0; right: 0; background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color); padding: 16px;
    gap: 8px; max-height: 80vh; overflow-y: auto;
  }
  .mobile-menu-btn { display: flex; }
  .nav-dropdown-menu {
    position: static; box-shadow: none; border: none;
    background: var(--bg-secondary); margin-top: 8px;
    opacity: 1; visibility: visible; transform: none; display: none;
  }
  .nav-dropdown-menu.open { display: block; }
  .nav-dropdown-trigger { width: 100%; justify-content: space-between; }
}
@media (max-width: 768px) {
  .data-table { font-size: 0.85rem; }
  .data-table th, .data-table td { padding: 8px 10px; }
  .stat-card { padding: 14px; }
  .stat-value { font-size: 1.4rem !important; }
  .card { padding: 20px; }
}