* {
  box-sizing: border-box;
}

:root {
  --primary: #1a73e8;
  --primary-dark: #0d47a1;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.8;
}

a {
  color: var(--primary);
}

.header {
  background: #1e293b;
  color: #fff;
}

.header-inner,
main,
footer .inner {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

.back {
  color: #bfdbfe;
  text-decoration: none;
  font-size: .92rem;
}

.hero {
  padding: 52px 16px;
  color: #fff;
  text-align: center;
  background: linear-gradient(135deg, #1a73e8 0%, #0d47a1 60%, #1565c0 100%);
}

.hero h1 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 5vw, 2.45rem);
  line-height: 1.35;
}

.hero p {
  margin: 0;
  color: rgba(255,255,255,.86);
}

main {
  margin-top: 32px;
  margin-bottom: 48px;
  padding: 34px 40px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

h2 {
  margin: 32px 0 10px;
  color: var(--primary-dark);
  font-size: 1.35rem;
}

h2:first-child {
  margin-top: 0;
}

p, li {
  font-size: .98rem;
}

.meta {
  color: var(--muted);
  font-size: .9rem;
}

.notice {
  padding: 14px 16px;
  border-left: 4px solid var(--primary);
  border-radius: 8px;
  background: #eff6ff;
}

footer {
  padding: 26px 0;
  color: #94a3b8;
  background: #0f172a;
  font-size: .88rem;
  text-align: center;
}

footer a {
  color: #93c5fd;
}

@media (max-width: 600px) {
  main {
    width: calc(100% - 24px);
    padding: 24px 18px;
  }
}