:root {
  color-scheme: dark;
  --bg: #030407;
  --panel: rgba(255, 255, 255, 0.045);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f7f8fb;
  --soft: #b9bdc9;
  --dim: #858b99;
  --accent: #38bdf8;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(56, 189, 248, 0.15), transparent 32rem),
    radial-gradient(circle at 90% 80%, rgba(129, 140, 248, 0.1), transparent 30rem),
    var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #c7efff; }

.page {
  width: min(880px, calc(100% - 36px));
  margin: 0 auto;
  padding: 34px 0 72px;
}

.page-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 72px;
}

.brand {
  color: var(--text);
  font-weight: 650;
  letter-spacing: -0.02em;
}

.brand small {
  display: block;
  margin-top: 4px;
  color: var(--dim);
  font: 9px/1.5 Consolas, monospace;
  letter-spacing: 0.16em;
}

.back { color: var(--soft); font-size: 13px; }

.eyebrow {
  margin: 0;
  color: var(--accent);
  font: 10px/1.6 Consolas, monospace;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 12px 0 20px;
  font-size: clamp(42px, 8vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.06em;
}

h1 em { color: var(--accent); font-style: normal; }

.lede {
  max-width: 720px;
  margin: 0;
  color: var(--soft);
  font-size: 16px;
  line-height: 1.85;
}

.notice {
  margin: 38px 0 48px;
  padding: 20px 22px;
  border: 1px solid rgba(56, 189, 248, 0.22);
  border-radius: 18px;
  background: linear-gradient(120deg, rgba(56, 189, 248, 0.09), rgba(255, 255, 255, 0.015));
  color: var(--soft);
  line-height: 1.8;
}

.notice strong { color: var(--text); }
section { margin-top: 46px; }
h2 { margin: 0 0 14px; font-size: 21px; }
h3 { margin: 26px 0 8px; color: var(--text); font-size: 15px; }
p, li { color: var(--soft); font-size: 14px; line-height: 1.85; }
ul { margin: 12px 0 0; padding-left: 20px; }

.facts {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.fact {
  min-height: 124px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

.fact strong, .fact span { display: block; }
.fact strong { margin-bottom: 10px; font-size: 15px; }
.fact span { color: var(--dim); font-size: 12px; line-height: 1.7; }
code { color: #d9f5ff; font: 12px/1.6 Consolas, monospace; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 72px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 11px;
}

@media (max-width: 700px) {
  .page { width: min(100% - 24px, 880px); padding-top: 22px; }
  .page-head { margin-bottom: 46px; }
  .facts { grid-template-columns: 1fr; }
  footer { flex-direction: column; }
}