:root {
  --primary: #0b3d91;
  --primary-soft: #2b6cb0;
  --accent: #00a3c4;
  --deep: #062a5c;
  --surface: #f3f7fb;
  --text: #1a2b4a;
  --muted: #5b6b86;
  --line: #d7e4f2;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 420px at 8% -10%, rgba(0, 163, 196, 0.18), transparent 55%),
    radial-gradient(800px 380px at 96% 0%, rgba(11, 61, 145, 0.22), transparent 50%),
    linear-gradient(180deg, #062a5c 0%, #0b3d91 38%, var(--surface) 38%);
}
a { color: var(--primary-soft); }
.wrap { max-width: 880px; margin: 0 auto; padding: 28px 20px 48px; }
header.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
}
.brand img {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18);
}
.brand strong { display: block; font-size: 18px; letter-spacing: 0.4px; }
.brand span { display: block; font-size: 12px; opacity: 0.85; }
nav a {
  color: #e8f4ff;
  text-decoration: none;
  margin-left: 14px;
  font-size: 14px;
  border-bottom: 1px dotted rgba(232, 244, 255, 0.45);
}
.hero, .card, .legal {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 12px 32px rgba(6, 42, 92, 0.1);
}
.hero { padding: 32px 28px; text-align: center; }
.hero h1 { margin: 0; font-size: clamp(24px, 4vw, 34px); color: var(--deep); }
.hero p { margin: 14px auto 0; max-width: 640px; color: var(--muted); line-height: 1.75; font-size: 15px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.card { padding: 18px 16px; }
.card h3 { margin: 0; color: var(--primary); font-size: 16px; }
.card p { margin: 8px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.legal { padding: 28px 26px 36px; margin-top: 8px; }
.legal h1 { margin: 0 0 8px; font-size: 24px; color: var(--deep); }
.meta { color: var(--muted); font-size: 13px; margin: 0 0 18px; }
.legal .body {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.75;
  font-size: 15px;
}
.support-list { margin: 0; padding-left: 18px; line-height: 1.8; }
.lang { font-size: 14px; margin-bottom: 12px; }
footer {
  text-align: center;
  margin-top: 28px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.85;
}
footer a { color: var(--primary); text-decoration: none; }
@media (max-width: 640px) {
  header.top { flex-direction: column; align-items: flex-start; }
  nav a { margin: 0 12px 0 0; }
  .hero, .legal { padding: 22px 16px; }
}