:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary: #86868b;
  --border: #d2d2d7;
  --action: #0071e3;
  --action-bright: #2997ff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #0a0a0c;
    --text: #f5f5f7;
    --text-secondary: #a1a1a6;
    --text-tertiary: #86868b;
    --border: #424245;
    --action: #2997ff;
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  padding: 80px 24px 60px;
}
.container { max-width: 720px; margin: 0 auto; }
.nav {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; color: var(--text-secondary);
  text-decoration: none; margin-bottom: 32px;
}
.nav:hover { color: var(--text); }
h1 {
  font-size: clamp(32px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: 16px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: 999px;
  background: var(--bg-alt); border: 1px solid var(--border);
  font-size: 13px; color: var(--text-secondary);
}
.chip strong { color: var(--text); font-weight: 600; }
.narrative {
  font-size: 18px; line-height: 1.7;
  color: var(--text);
  margin: 24px 0 32px;
}
.narrative p { margin-bottom: 16px; }
.cta {
  display: inline-block;
  padding: 14px 28px; border-radius: 999px;
  background: var(--action); color: #fff;
  font-size: 17px; font-weight: 600;
  text-decoration: none;
  transition: opacity 0.15s, transform 0.1s;
}
.cta:hover { opacity: 0.85; transform: translateY(-1px); }
.fallback {
  margin-top: 24px; font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.6;
}
footer {
  margin-top: 64px; padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px; color: var(--text-tertiary);
  display: flex; gap: 24px; flex-wrap: wrap;
}
footer a { color: var(--text-secondary); text-decoration: none; }
footer a:hover { color: var(--text); }