* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: #1f2937;
  background:
    radial-gradient(circle at 12% 10%, rgba(99, 102, 241, 0.16), transparent 32rem),
    linear-gradient(180deg, #f8fafc 0%, #eef2ff 100%);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

a {
  color: #4f46e5;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 56px;
}

.hero {
  margin-bottom: 24px;
  padding: 30px;
  color: white;
  background: linear-gradient(135deg, #1f2937, #4f46e5);
  border-radius: 28px;
  box-shadow: 0 22px 50px rgba(79, 70, 229, 0.22);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mark {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: #4f46e5;
  background: white;
  border-radius: 10px;
}

h1 {
  margin: 18px 0 8px;
  font-size: clamp(30px, 6vw, 48px);
  line-height: 1.12;
}

.subtitle {
  max-width: 720px;
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 16px;
}

.updated {
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.66);
  font-size: 14px;
}

.card {
  margin-top: 18px;
  padding: 28px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.24);
  border-radius: 24px;
  box-shadow: 0 18px 46px rgba(15, 23, 42, 0.08);
}

h2 {
  margin: 30px 0 12px;
  color: #111827;
  font-size: 22px;
  line-height: 1.35;
}

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

h3 {
  margin: 20px 0 8px;
  color: #374151;
  font-size: 17px;
}

p {
  margin: 0 0 12px;
}

ul {
  margin: 0 0 12px;
  padding-left: 22px;
}

li {
  margin-bottom: 7px;
}

.notice {
  margin: 18px 0;
  padding: 16px 18px;
  background: #eef2ff;
  border: 1px solid #c7d2fe;
  border-radius: 16px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.mini-card {
  padding: 18px;
  background: #f8fafc;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
}

.mini-card strong {
  display: block;
  margin-bottom: 6px;
  color: #111827;
}

.footer {
  margin-top: 24px;
  color: #64748b;
  font-size: 14px;
  text-align: center;
}

@media (max-width: 720px) {
  .page {
    width: min(100% - 24px, 920px);
    padding-top: 24px;
  }

  .hero,
  .card {
    padding: 22px;
    border-radius: 22px;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}