:root {
  --color-primary: #ea2804;
  --color-primary-deep: #c01f00;
  --color-on-primary: #ffffff;
  --color-ink: #202020;
  --color-body: #3a3a3a;
  --color-charcoal: #575757;
  --color-mute: #646464;
  --color-ash: #8d8d8d;
  --color-stone: #bbbbbb;
  --color-on-dark: #fcfcfc;
  --color-on-dark-mute: rgba(252,252,252,0.72);
  --color-canvas: #f9f7f3;
  --color-surface-bone: #f3f0e8;
  --color-surface-card: #ffffff;
  --color-surface-dark: #202020;
  --color-surface-deep: #000000;
  --color-hairline: rgba(32,32,32,0.12);
  --color-hairline-strong: #202020;
  --color-divider-dark: rgba(255,255,255,0.2);
  --color-hero-warm: #ea2804;
  --color-hero-glow: #ff6a3d;
  --color-hero-pink: #f4a8a0;
  --color-badge-success: #2b9a66;
  --color-link: #ea2804;
  --color-ring-focus: rgba(59,130,246,0.5);
  --rounded-none: 0px;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 10px;
  --rounded-lg: 16px;
  --rounded-full: 9999px;
  --space-xxs: 2px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --space-xxxl: 48px;
  --space-section: 96px;
  --space-band: 160px;
  --font-display: "rb-freigeist-neue", "Bricolage Grotesque", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "basier-square", Geist, Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "jetbrains-mono", "JetBrains Mono", ui-monospace, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font-family: var(--font-body); color: var(--color-body); background: var(--color-canvas); font-size: 16px; line-height: 1.5; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1280px; margin: 0 auto; padding: 0 32px; }
.header { background: var(--color-canvas); border-bottom: 1px solid var(--color-hairline); }
.header-inner { display: flex; align-items: center; gap: 20px; min-height: 60px; flex-wrap: wrap; }
.logo { font-family: var(--font-display); font-weight: 700; color: var(--color-ink); font-size: 20px; letter-spacing: -0.4px; }
.logo:hover { text-decoration: none; color: var(--color-ink); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 18px; flex: 1; }
.nav a { color: var(--color-ink); font-size: 14px; font-weight: 600; }
.nav a.on { color: var(--color-primary); }
.back { margin-left: auto; font-size: 12px; color: var(--color-mute); }
.header-cta {
  background: var(--color-primary); color: #fff; border-radius: 9999px;
  padding: 12px 24px; height: 44px; display: inline-flex; align-items: center;
  font-size: 16px; font-weight: 600;
}
.header-cta:hover { background: var(--color-primary-deep); text-decoration: none; color: #fff; }

.hero {
  background:
    radial-gradient(ellipse at 30% 20%, var(--color-hero-glow) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, var(--color-hero-pink) 0%, transparent 45%),
    var(--color-hero-warm);
  color: #fff; padding: 96px 0;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: 72px; font-weight: 700; line-height: 1; letter-spacing: -1.8px;
  margin: 0 0 16px; color: #fff; max-width: 12ch;
}
.hero p { margin: 0; color: rgba(252,252,252,0.9); font-size: 18px; font-weight: 600; max-width: 34em; }
.hero-actions { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

.btn, form button {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-primary); color: #fff; border: 0; border-radius: 9999px;
  padding: 12px 24px; height: 44px;
  font-family: var(--font-body); font-size: 16px; font-weight: 600; cursor: pointer;
}
.btn:hover, form button:hover { background: var(--color-primary-deep); text-decoration: none; color: #fff; }
.btn-dark { background: #202020; color: #fcfcfc; }
.btn-dark:hover { color: #fcfcfc; }
.btn-outline { background: #fff; color: #202020; border: 1px solid #202020; padding: 11px 23px; }
.btn-outline:hover { color: #202020; }
.btn-on-orange { background: #fff; color: #ea2804; }
.btn-on-orange:hover { color: #ea2804; background: #fcfcfc; }

.section { padding: 96px 0; }
.section.bone { background: var(--color-surface-bone); }
.section.dark { background: var(--color-surface-dark); color: var(--color-on-dark); }
.section h2 {
  font-family: var(--font-display); font-size: 48px; font-weight: 700;
  line-height: 1; letter-spacing: -1px; margin: 0 0 24px; color: var(--color-ink);
}
.section.dark h2 { color: #fcfcfc; }
.muted { color: var(--color-mute); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: start; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  background: #fff; border: 1px solid var(--color-hairline);
  border-radius: 10px; padding: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 20px; font-weight: 600; letter-spacing: -0.3px; color: var(--color-ink); }
.card p { margin: 0; font-size: 14px; color: var(--color-charcoal); }
.badge {
  display: inline-block; background: var(--color-badge-success); color: #fff;
  border-radius: 9999px; padding: 4px 10px; font-size: 12px; margin-bottom: 8px;
}
.tag {
  display: inline-block; background: var(--color-canvas); border: 1px solid var(--color-hairline);
  border-radius: 9999px; padding: 4px 10px; font-size: 12px; color: var(--color-ink);
}

.code {
  background: #202020; color: #fcfcfc; border-radius: 10px; padding: 24px;
  font-family: var(--font-mono); font-size: 14px; line-height: 1.43;
}
.code-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.code-tab { background: #000; color: rgba(252,252,252,0.72); border-radius: 4px; padding: 6px 12px; font-size: 11px; font-family: var(--font-mono); }
.code-tab.on { color: #fcfcfc; box-shadow: inset 0 -2px 0 #ea2804; }
.code .kw { color: #f4a8a0; }
.code .str { color: #ff6a3d; }

.avatars { display: flex; gap: 8px; }
.avatar { width: 40px; height: 40px; border-radius: 50%; background: #fff; border: 1px solid var(--color-hairline); }

.ph {
  background: var(--color-surface-bone); color: var(--color-ash);
  height: 140px; display: flex; align-items: center; justify-content: center;
  font-size: 13px; margin-bottom: 12px; border-radius: 10px;
}
.list { list-style: none; margin: 0; padding: 0; }
.list li { border-bottom: 1px solid var(--color-hairline); padding: 14px 0; color: var(--color-ink); }
.list .date { color: var(--color-mute); font-size: 12px; margin-right: 12px; }

form label { display: block; margin: 0 0 4px; font-size: 14px; font-weight: 600; color: var(--color-ink); }
form input, form textarea {
  width: 100%; max-width: 480px; padding: 12px 20px; height: 44px;
  border: 1px solid var(--color-hairline); border-radius: 9999px;
  background: #fff; font: inherit; margin-bottom: 12px; color: var(--color-ink);
}
form textarea { height: auto; border-radius: 16px; }
form input:focus, form textarea:focus { outline: 3px solid var(--color-ring-focus); }

.footer { background: #000; color: #fcfcfc; padding: 64px 32px; font-size: 14px; }
.footer p { margin: 0 0 4px; color: rgba(252,252,252,0.72); }

@media (max-width: 900px) {
  .hero h1 { font-size: 48px; }
  .section h2 { font-size: 32px; }
  .grid, .grid-2, .grid-4 { grid-template-columns: 1fr; }
}

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