:root {
  --color-primary: #faff69;
  --color-primary-active: #e6eb52;
  --color-primary-disabled: #3a3a1f;
  --color-ink: #ffffff;
  --color-body: #cccccc;
  --color-body-strong: #e6e6e6;
  --color-muted: #888888;
  --color-muted-soft: #5a5a5a;
  --color-hairline: #2a2a2a;
  --color-hairline-strong: #3a3a3a;
  --color-canvas: #0a0a0a;
  --color-surface-soft: #121212;
  --color-surface-card: #1a1a1a;
  --color-surface-elevated: #242424;
  --color-surface-yellow-band: #faff69;
  --color-on-primary: #0a0a0a;
  --color-on-dark: #ffffff;
  --color-on-yellow: #0a0a0a;
  --color-accent-emerald: #22c55e;
  --color-accent-rose: #ef4444;
  --color-accent-blue: #3b82f6;
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-pill: 9999px;
  --rounded-full: 9999px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;
  --font-display: Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Consolas, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", monospace;
}

* { box-sizing: border-box; }
html { background: var(--color-canvas); }
body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-body);
  background: var(--color-canvas);
  font-size: 16px;
  line-height: 1.55;
}
a { color: var(--color-primary); text-decoration: underline; }
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

.header {
  background: var(--color-canvas);
  height: 64px;
  border-bottom: 1px solid var(--color-hairline);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 64px;
}
.logo {
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--color-on-dark);
  font-size: 18px;
  text-decoration: none;
}
.logo i {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  vertical-align: middle;
}
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; flex: 1; }
.nav a { color: var(--color-on-dark); font-size: 14px; font-weight: 500; text-decoration: none; }
.nav a.on { color: var(--color-primary); }
.back { margin-left: auto; font-size: 13px; color: var(--color-muted); text-decoration: none; }

.hero { padding: var(--space-section) 0; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero h1 {
  font-size: 72px;
  font-weight: 700;
  letter-spacing: -2.5px;
  line-height: 1.05;
  color: var(--color-ink);
  margin: 0 0 16px;
}
.hero p { margin: 0 0 24px; max-width: 36em; font-size: 18px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 12px 20px;
  border-radius: var(--rounded-md);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 14px;
  font-weight: 600;
  border: 0;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--color-primary-active); color: var(--color-on-primary); text-decoration: none; }
.btn-line {
  background: var(--color-surface-card);
  color: var(--color-on-dark);
}
.btn-line:hover { background: var(--color-surface-card); color: var(--color-on-dark); }
.btn-black {
  background: var(--color-canvas);
  color: var(--color-primary);
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--rounded-pill);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.code {
  background: var(--color-surface-card);
  border: 1px solid var(--color-hairline);
  border-radius: var(--rounded-lg);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--color-on-dark);
  overflow: auto;
}
.code .kw { color: var(--color-primary); }
.code .fn { color: var(--color-accent-blue); }
.code .cmt { color: var(--color-muted); }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 32px 0;
}
.stat strong {
  display: block;
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1;
  color: var(--color-primary);
}
.stat span { color: var(--color-muted); font-size: 13px; }

.section { padding: var(--space-section) 0; }
.section h2 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--color-ink);
  margin: 0 0 32px;
}
.kicker {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin: 0 0 8px;
}

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.card {
  background: var(--color-surface-card);
  border-radius: var(--rounded-lg);
  padding: 32px;
  border: 1px solid var(--color-hairline);
}
.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
}
.card p { margin: 0; font-size: 14px; color: var(--color-body); }
.card.yellow {
  background: var(--color-primary);
  color: var(--color-on-yellow);
  border: 0;
}
.card.yellow h3, .card.yellow p { color: var(--color-on-yellow); }

.list { list-style: none; margin: 0; padding: 0; }
.list li { border-bottom: 1px solid var(--color-hairline); padding: 16px 0; color: var(--color-ink); }
.list .date { color: var(--color-muted); font-size: 13px; margin-right: 12px; }

.ph {
  background: var(--color-surface-elevated);
  color: var(--color-muted);
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin-bottom: 12px;
  border-radius: 12px;
}

.cta-yellow {
  background: var(--color-primary);
  color: var(--color-on-yellow);
  border-radius: var(--rounded-lg);
  padding: 64px;
  text-align: center;
}
.cta-yellow h2 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -1.5px;
  color: var(--color-on-yellow);
  margin: 0 0 12px;
}

.page-hero { padding: 64px 0 24px; }
.page-hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -2px;
  color: var(--color-ink);
  margin: 0 0 8px;
}

.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tabs a {
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--color-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}
.tabs a.on { background: var(--color-surface-card); color: var(--color-on-dark); }

form label { display: block; margin: 0 0 4px; font-size: 14px; color: var(--color-on-dark); }
form input, form textarea {
  width: 100%;
  max-width: 480px;
  padding: 10px 14px;
  border: 1px solid var(--color-hairline);
  border-radius: 8px;
  background: var(--color-surface-card);
  color: var(--color-on-dark);
  font: inherit;
  margin-bottom: 12px;
}
form input:focus, form textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.footer {
  background: var(--color-canvas);
  color: var(--color-muted);
  padding: 64px 0;
  border-top: 1px solid var(--color-hairline);
  font-size: 14px;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer h3 { color: var(--color-on-dark); font-size: 14px; margin: 0 0 12px; }
.footer a { display: block; color: var(--color-muted); margin: 8px 0; text-decoration: none; }
.footer p { margin: 0 0 4px; }

@media (max-width: 900px) {
  .hero h1 { font-size: 36px; letter-spacing: -1px; }
  .hero-grid, .grid, .grid-2, .stats, .footer-grid { grid-template-columns: 1fr; }
}

.ph { overflow: hidden; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; }