:root {
  --color-primary: #0007cd;
  --color-primary-active: #0005a3;
  --color-primary-glow: #1a26ff;
  --color-ink: #ffffff;
  --color-body: #a8a8a8;
  --color-body-strong: #ffffff;
  --color-muted: #888888;
  --color-muted-soft: #666666;
  --color-hairline: #222222;
  --color-hairline-soft: #1a1a1a;
  --color-hairline-strong: #333333;
  --color-canvas: #0f0f0f;
  --color-canvas-deep: #000000;
  --color-surface-card: #181818;
  --color-surface-card-elevated: #222222;
  --color-surface-strong: #2a2a2a;
  --color-on-primary: #ffffff;
  --color-on-dark: #ffffff;
  --color-accent-cyan: #00d4ff;
  --color-accent-violet: #7b3aed;
  --color-semantic-error: #ff4d4d;
  --color-semantic-success: #33d17a;
  --rounded-none: 0px;
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-pill: 9999px;
  --rounded-full: 9999px;
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-base: 16px;
  --space-md: 20px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-section: 96px;
  --font-display: "abcDiatype", Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "abcDiatype", Inter, system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, "Segoe UI", "PingFang SC", "Microsoft YaHei", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-canvas);
  font-size: 16px;
  line-height: 1.5;
}
a { color: var(--color-body); text-decoration: none; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 48px; }

.site-header {
  height: 64px;
  background: var(--color-canvas);
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--color-hairline-soft);
}
.header-inner { height: 64px; display: flex; align-items: center; gap: 28px; }
.logo {
  font-weight: 500;
  font-size: 18px;
  letter-spacing: -0.4px;
  color: var(--color-ink);
}
.logo span { color: var(--color-primary-glow); }
.nav { display: flex; gap: 22px; flex: 1; }
.nav a { color: var(--color-body); font-size: 14px; font-weight: 500; }
.nav a.on { color: var(--color-ink); }
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.back { font-size: 13px; color: var(--color-muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  border: 0;
  cursor: pointer;
  border-radius: var(--rounded-md);
  padding: 10px 18px;
  height: 40px;
}
.btn-primary { background: var(--color-primary); color: var(--color-on-primary); }
.btn-primary:active { background: var(--color-primary-active); }
.btn-secondary { background: var(--color-surface-card-elevated); color: var(--color-ink); }
.btn-outline {
  background: transparent;
  color: var(--color-ink);
  box-shadow: inset 0 0 0 1px var(--color-hairline-strong);
  padding: 9px 17px;
}

.hero {
  padding: 96px 0 72px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 42%;
  width: 720px;
  height: 720px;
  transform: translate(-50%, -40%);
  background: radial-gradient(circle, rgba(26, 38, 255, 0.38) 0%, rgba(0, 7, 205, 0.12) 38%, transparent 68%);
  pointer-events: none;
}
.hero-inner { position: relative; text-align: center; }
.eyebrow {
  display: inline-flex;
  background: var(--color-surface-card-elevated);
  color: var(--color-ink);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.88px;
  text-transform: uppercase;
  border-radius: var(--rounded-pill);
  padding: 4px 10px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 64px;
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -2px;
  margin: 0 auto 18px;
  max-width: 16ch;
}
.hero p {
  margin: 0 auto 28px;
  color: var(--color-body);
  max-width: 40em;
}
.hero-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }

.term-grid {
  background: var(--color-canvas-deep);
  border-radius: var(--rounded-xl);
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  text-align: left;
  max-width: 880px;
  margin: 0 auto;
  border: 1px solid var(--color-hairline);
}
.pane {
  background: var(--color-surface-card);
  border-radius: var(--rounded-lg);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-body);
  min-height: 140px;
}
.pane strong { display: block; color: var(--color-ink); font-weight: 500; margin-bottom: 8px; font-family: var(--font-body); font-size: 12px; letter-spacing: 0.6px; text-transform: uppercase; }
.pane .ok { color: var(--color-semantic-success); }
.pane .cyan { color: var(--color-accent-cyan); }

.page-hero { padding: 72px 0 40px; }
.page-hero h1 {
  font-size: 44px;
  font-weight: 500;
  letter-spacing: -1.32px;
  line-height: 1.1;
  margin: 0 0 12px;
}
.page-hero p { margin: 0; color: var(--color-body); max-width: 40em; }

.band { padding: 96px 0; }
.band h2 {
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.96px;
  margin: 0 0 12px;
}
.lead { color: var(--color-body); margin: 0 0 36px; max-width: 40em; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.stat {
  background: var(--color-surface-card);
  border-radius: var(--rounded-xl);
  padding: 28px;
}
.stat h3 { margin: 0 0 6px; font-size: 32px; font-weight: 500; letter-spacing: -0.8px; }
.stat p { margin: 0; color: var(--color-body); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.card {
  background: var(--color-surface-card);
  border-radius: var(--rounded-xl);
  padding: 28px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; font-weight: 600; }
.card p { margin: 0; color: var(--color-body); }
.ph {
  background: #1c1c1c;
  color: var(--color-muted);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  margin: -28px -28px 20px;
  border-radius: var(--rounded-xl) var(--rounded-xl) 0 0;
}

.toolkit {
  background: var(--color-surface-card);
  border-radius: var(--rounded-lg);
  padding: 20px;
}
.tk-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--rounded-md);
  background: var(--color-surface-card-elevated);
  margin-bottom: 12px;
}
.toolkit h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.toolkit p { margin: 0; color: var(--color-body); font-size: 14px; }

.spotlight {
  background: var(--color-surface-card);
  border-radius: var(--rounded-xl);
  padding: 48px;
  position: relative;
  overflow: hidden;
}
.spotlight::before {
  content: "";
  position: absolute;
  inset: auto auto -40% -10%;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(26, 38, 255, 0.45), transparent 70%);
  pointer-events: none;
}
.spotlight h3 { position: relative; font-size: 32px; font-weight: 500; letter-spacing: -0.96px; margin: 0 0 12px; }
.spotlight p { position: relative; color: var(--color-body); margin: 0; }

.code {
  background: var(--color-canvas-deep);
  border-radius: var(--rounded-lg);
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-body);
  overflow: auto;
}

.list { list-style: none; margin: 0; padding: 0; }
.list li {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-hairline);
}
.list .date { color: var(--color-muted); font-family: var(--font-mono); font-size: 13px; min-width: 108px; }

.cta-band {
  padding: 96px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-band::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 560px;
  height: 560px;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(26, 38, 255, 0.32), transparent 70%);
  pointer-events: none;
}
.cta-band h2 { position: relative; font-size: 44px; font-weight: 500; letter-spacing: -1.32px; margin: 0 0 16px; }
.cta-band p { position: relative; color: var(--color-body); margin: 0 0 24px; }
.cta-band .btn { position: relative; }

form label { display: block; margin: 0 0 8px; font-size: 14px; font-weight: 600; }
form input, form textarea {
  width: 100%;
  max-width: 480px;
  padding: 12px 16px;
  height: 44px;
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--rounded-md);
  font: inherit;
  margin-bottom: 16px;
  background: var(--color-surface-card);
  color: var(--color-ink);
}
form textarea { height: auto; }

.site-footer {
  padding: 64px 0 32px;
  color: var(--color-body);
  font-size: 14px;
  border-top: 1px solid var(--color-hairline);
}
.footer-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; margin-bottom: 40px; }
.footer-grid h4 { margin: 0 0 10px; color: var(--color-ink); font-size: 12px; font-weight: 600; letter-spacing: 0.6px; text-transform: uppercase; }
.footer-grid a { display: block; padding: 4px 0; color: var(--color-body); }
.legal { color: var(--color-muted); font-size: 13px; }
.legal p { margin: 0 0 4px; }

@media (max-width: 900px) {
  .wrap { padding: 0 20px; }
  .hero h1 { font-size: 36px; }
  .term-grid, .grid-3, .grid-2, .grid-4, .stats, .footer-grid { grid-template-columns: 1fr; }
  .nav { display: none; }
  .band, .cta-band { padding: 64px 0; }
}

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