@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --color-bg: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #f1f5f9;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-accent: #06b6d4;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
  --header-height: 64px;
  --transition: all 0.2s ease;
}
[data-theme="dark"] {
  --color-bg: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a25;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #27273a;
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-light: rgba(59, 130, 246, 0.15);
  --color-accent: #22d3ee;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans); background-color: var(--color-bg); color: var(--color-text);
  line-height: 1.7; font-size: 15px;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }

.header {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-height);
  background: rgba(255,255,255,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border); z-index: 1000;
  display: flex; align-items: center; justify-content: space-between; padding: 0 24px;
}
[data-theme="dark"] .header { background: rgba(10,10,15,0.85); }
.header-left, .header-right { display: flex; align-items: center; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--color-text); text-decoration: none; }
.logo:hover { text-decoration: none; color: var(--color-text); }
.logo-icon {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
  color: white; font-size: 14px; font-weight: 700;
}
.header-btn {
  display: flex; align-items: center; gap: 6px; padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; color: var(--color-text-secondary); background: transparent;
  border: 1px solid transparent; cursor: pointer; transition: var(--transition); text-decoration: none;
}
.header-btn:hover { background: var(--color-bg-tertiary); color: var(--color-text); text-decoration: none; }
.theme-toggle { width: 40px; height: 40px; padding: 0; display: flex; align-items: center; justify-content: center; }

.main { margin-top: var(--header-height); }

.category-page { max-width: 900px; margin: 0 auto; padding: 48px 24px 64px; }
.category-page-header { margin-bottom: 40px; }
.back-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; color: var(--color-text-muted); margin-bottom: 20px; text-decoration: none;
}
.back-link:hover { color: var(--color-primary); text-decoration: none; }
.category-page-title { font-size: 36px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.category-page-desc { font-size: 16px; color: var(--color-text-secondary); line-height: 1.7; }

.doc-list { display: flex; flex-direction: column; gap: 12px; }
.doc-list-item {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 16px 20px; border-radius: var(--radius-md);
  background: var(--color-bg-secondary); border: 1px solid var(--color-border);
  text-decoration: none; color: var(--color-text); transition: var(--transition);
}
.doc-list-item:hover {
  border-color: var(--color-primary); transform: translateY(-1px);
  box-shadow: var(--shadow-md); text-decoration: none; color: var(--color-text);
}
.doc-list-item-left { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.doc-list-item-title { font-size: 15px; font-weight: 600; }
.doc-list-item-desc { font-size: 13px; color: var(--color-text-muted); }
.doc-list-item-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.doc-list-item-arrow { color: var(--color-text-muted); width: 18px; height: 18px; transition: var(--transition); }
.doc-list-item:hover .doc-list-item-arrow { color: var(--color-primary); transform: translateX(2px); }

.doc-tag {
  display: inline-flex; font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.03em; padding: 2px 8px; border-radius: 999px;
}
.doc-tag-new { background: rgba(16,185,129,0.1); color: var(--color-success); }
.doc-tag-wip { background: rgba(245,158,11,0.1); color: var(--color-warning); }
.doc-tag-popular { background: rgba(37,99,235,0.1); color: var(--color-primary); }

.footer {
  border-top: 1px solid var(--color-border); padding: 32px 24px;
  text-align: center; font-size: 13px; color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .header { padding: 0 16px; }
  .category-page { padding: 32px 16px 48px; }
  .category-page-title { font-size: 28px; }
  .doc-list-item { padding: 14px 16px; flex-direction: column; align-items: flex-start; }
  .doc-list-item-right { align-self: flex-end; }
}
::selection { background: var(--color-primary-light); color: var(--color-text); }
[data-theme="dark"] ::selection { background: rgba(59, 130, 246, 0.3); color: #f1f5f9; }