:root {
  color-scheme: light;
  --blue: #1677ff;
  --blue-dark: #0b4fc2;
  --ink: #172033;
  --muted: #667085;
  --line: #e7ebf2;
  --surface: #ffffff;
  --background: #f4f7fb;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue-dark); }

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.hero {
  padding: 32px;
  color: #fff;
  border-radius: 24px;
  background: linear-gradient(135deg, #115ce5, #29adf5);
  box-shadow: 0 18px 50px rgba(17, 92, 229, .18);
}

.hero h1 { margin: 0 0 8px; font-size: clamp(28px, 6vw, 42px); line-height: 1.25; }
.hero p { margin: 0; opacity: .9; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0;
}

.nav a {
  padding: 8px 13px;
  color: var(--blue-dark);
  background: #eaf2ff;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.card {
  margin-top: 18px;
  padding: 24px 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 10px 32px rgba(30, 55, 90, .05);
}

.card h2 { margin: 0 0 10px; font-size: 21px; line-height: 1.4; }
.card h3 { margin: 20px 0 6px; font-size: 17px; }
.card p { margin: 8px 0; }
.card ul, .card ol { margin: 8px 0; padding-left: 24px; }
.card li { margin: 5px 0; }

.meta { color: var(--muted); font-size: 14px; }
.notice { padding: 13px 15px; background: #eef6ff; border-left: 4px solid var(--blue); border-radius: 10px; }

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 18px;
}

.grid a {
  display: block;
  min-height: 132px;
  padding: 20px;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  text-decoration: none;
}

.grid strong { display: block; margin-bottom: 6px; font-size: 18px; }
.grid span { color: var(--muted); font-size: 14px; }

table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14px; }
th, td { padding: 10px; text-align: left; vertical-align: top; border: 1px solid var(--line); }
th { background: #f7f9fc; }

footer { padding: 24px 4px 0; text-align: center; color: var(--muted); font-size: 13px; }

@media (max-width: 680px) {
  .shell { width: min(100% - 22px, 920px); padding-top: 12px; }
  .hero { padding: 25px 22px; border-radius: 19px; }
  .card { padding: 20px 18px; border-radius: 17px; }
  .grid { grid-template-columns: 1fr; }
  table { display: block; overflow-x: auto; white-space: nowrap; }
}