:root {
  --bg: #fafaf8;
  --card: #fff;
  --text: #1b1b26;
  --muted: #696978;
  --blue: #3b82f6;
  --purple: #7c5cf0;
  --green: #10b981;
  --line: rgba(20,20,40,.1);
  --shadow: 0 1px 2px rgba(20,20,40,.04), 0 16px 46px rgba(20,20,40,.07);
}
* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% -8%, rgba(59,130,246,.13), transparent 31rem),
    radial-gradient(circle at 96% 18%, rgba(124,92,240,.10), transparent 26rem),
    var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang TC", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
.shell { width: min(820px, calc(100% - 40px)); margin: 0 auto; }
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}
.brand { color: var(--text); font-weight: 760; font-size: 18px; letter-spacing: -.02em; }
.back { color: var(--muted); font-size: 14px; }
main { padding: 66px 0 90px; }
.eyebrow {
  color: var(--blue);
  font-size: 12px;
  font-weight: 720;
  letter-spacing: .12em;
  text-transform: uppercase;
}
h1 {
  max-width: 690px;
  margin: 10px 0 14px;
  font-size: clamp(36px, 7vw, 62px);
  line-height: 1.06;
  letter-spacing: -.045em;
}
.lead { max-width: 650px; color: var(--muted); font-size: 17px; }
.meta { margin-top: 18px; color: var(--muted); font-size: 13px; }
.document {
  margin-top: 44px;
  padding: clamp(26px, 5vw, 50px);
  background: rgba(255,255,255,.9);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.document h2 { margin: 34px 0 8px; font-size: 20px; letter-spacing: -.02em; }
.document h2:first-child { margin-top: 0; }
.document p, .document li { color: #4f4f5e; }
.document ul { padding-left: 22px; }
.notice {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 3px solid var(--green);
  border-radius: 0 10px 10px 0;
  background: rgba(16,185,129,.07);
  color: #315b4b;
}
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  font-weight: 650;
  font-size: 14px;
  box-shadow: var(--shadow);
}
.button.primary { background: var(--text); color: #fff; }
.button:hover { text-decoration: none; transform: translateY(-1px); }
footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
@media (max-width: 560px) {
  main { padding-top: 42px; }
  .document { border-radius: 16px; }
}