:root {
  color-scheme: dark;
  --bg: #050811;
  --panel: rgba(255, 255, 255, 0.055);
  --stroke: rgba(255, 255, 255, 0.12);
  --text: #f7f9ff;
  --muted: #b4bdd2;
  --dim: #8b95ad;
  --blue: #75a2ff;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.72;
  background:
    radial-gradient(ellipse 70% 45% at 85% 5%, rgba(91, 140, 255, 0.16), transparent 58%),
    radial-gradient(ellipse 55% 45% at 10% 45%, rgba(168, 121, 255, 0.11), transparent 60%),
    linear-gradient(165deg, #050811 0%, #091327 52%, #17152f 100%);
}
a { color: var(--blue); }
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 12px max(24px, calc((100vw - 920px) / 2));
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(5, 8, 17, 0.78);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.back { color: var(--muted); text-decoration: none; font-size: 14px; }
.back:hover { color: var(--text); }
main { width: min(920px, calc(100% - 36px)); margin: 0 auto; padding: 54px 0 80px; }
.card {
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--stroke);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(12px);
}
h1 { margin: 0 0 8px; font-size: clamp(34px, 6vw, 48px); line-height: 1.14; letter-spacing: -0.025em; }
h2 { margin: 34px 0 8px; font-size: 22px; line-height: 1.3; }
h3 { margin: 24px 0 6px; font-size: 18px; }
p, li { color: var(--muted); }
li + li { margin-top: 8px; }
.lede { font-size: 17px; color: #d9e0f2; }
.muted { margin-top: 0; color: var(--dim); font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.button {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 17px;
  border: 1px solid rgba(117, 162, 255, 0.28);
  border-radius: 999px;
  color: var(--text);
  background: rgba(91, 140, 255, 0.12);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}
.divider { height: 1px; margin: 42px 0; background: var(--stroke); }
footer { padding: 0 18px 40px; color: var(--dim); text-align: center; font-size: 13px; }
code { padding: 2px 6px; border-radius: 6px; color: #dfe8ff; background: rgba(255, 255, 255, 0.09); }
@media (max-width: 560px) {
  .nav { padding-inline: 18px; }
  .back { font-size: 0; }
  .back::after { content: "首页"; font-size: 14px; }
  main { padding-top: 28px; }
}