:root {
  --bg: #fafafa;
  --fg: #1a1a2e;
  --accent: #2563eb;
  --accent2: #3b82f6;
  --muted: #6b7280;
  --border: #e5e7eb;
  --card: #ffffff;
  --code-bg: #f3f4f6;
  --tag-bg: #e0e7ff;
  --tag-fg: #3730a3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #e2e8f0;
    --accent: #60a5fa;
    --accent2: #3b82f6;
    --muted: #94a3b8;
    --border: #1e293b;
    --card: #1e293b;
    --code-bg: #1e293b;
    --tag-bg: #1e3a5f;
    --tag-fg: #93c5fd;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
}

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

.container { max-width: 860px; margin: 0 auto; padding: 0 24px; }

/* nav */
nav {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

nav .logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.5px;
}

nav .logo:hover { text-decoration: none; }

nav .logo span { color: var(--accent); }

nav .links { display: flex; gap: 24px; }

nav .links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

nav .links a:hover {
  color: var(--fg);
  text-decoration: none;
}

nav .links a.active { color: var(--fg); }

/* hero */
.hero {
  padding: 80px 0 48px;
  text-align: center;
}

.hero h1 {
  font-size: 40px;
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.hero h1 span { color: var(--accent); }

.hero p {
  font-size: 18px;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero .badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  background: var(--tag-bg);
  color: var(--tag-fg);
}

/* sections */
section { padding: 48px 0; }

section h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 16px;
  transition: border-color 0.2s;
}

.card:hover { border-color: var(--accent2); }

.card h3 { font-size: 18px; margin-bottom: 8px; }

.card h3 a { color: var(--fg); }
.card h3 a:hover { color: var(--accent); }

.card p { font-size: 15px; color: var(--muted); line-height: 1.6; }

.card .meta {
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px;
}

.card .tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* wiki page */
.wiki-content {
  font-size: 16px;
  line-height: 1.8;
}

.wiki-content h2 {
  font-size: 22px;
  font-weight: 700;
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.wiki-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 8px;
}

.wiki-content p { margin-bottom: 16px; }
.wiki-content ul, .wiki-content ol { margin: 0 0 16px 24px; }
.wiki-content li { margin-bottom: 6px; }

.wiki-content code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
}

.wiki-content pre {
  background: var(--code-bg);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 16px;
  font-size: 14px;
}

.wiki-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 8px 16px;
  margin: 16px 0;
  background: var(--card);
  color: var(--muted);
}

.wiki-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
}

.wiki-content th, .wiki-content td {
  padding: 10px 12px;
  border: 1px solid var(--border);
  text-align: left;
  font-size: 15px;
}

.wiki-content th {
  background: var(--card);
  font-weight: 600;
}

/* toc */
.toc {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 32px;
}

.toc h3 { font-size: 15px; margin-bottom: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.5px; }
.toc ul { list-style: none; margin: 0; }
.toc li { margin-bottom: 6px; }
.toc a { font-size: 14px; }

/* footer */
footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-top: 48px;
}

/* page header */
.page-header {
  padding: 48px 0 24px;
}

.page-header h1 {
  font-size: 32px;
  font-weight: 800;
}

.page-header p {
  color: var(--muted);
  margin-top: 8px;
  font-size: 16px;
}

/* responsive */
@media (max-width: 600px) {
  .hero h1 { font-size: 28px; }
  nav .container { flex-direction: column; gap: 12px; }
  .hero { padding: 48px 0 32px; }
  section { padding: 32px 0; }
  .page-header { padding: 32px 0 16px; }
  .page-header h1 { font-size: 24px; }
}