:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #637083;
  --line: #e5e8ee;
  --accent: #3b82f6;
  --accent-dark: #1d4ed8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.72;
}

.page {
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 20px 72px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.06);
  overflow: hidden;
}

.hero {
  padding: 42px 42px 26px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.10), rgba(255, 255, 255, 0));
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  color: var(--accent-dark);
  background: rgba(59, 130, 246, 0.10);
  border: 1px solid rgba(59, 130, 246, 0.18);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
}

h1 {
  margin: 22px 0 10px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.meta {
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}

.content {
  padding: 34px 42px 46px;
}

h2 {
  margin: 32px 0 12px;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

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

p {
  margin: 0 0 14px;
}

ul {
  margin: 8px 0 18px 20px;
  padding: 0;
}

li {
  margin: 6px 0;
}

.notice {
  margin: 24px 0;
  padding: 16px 18px;
  border: 1px solid rgba(59, 130, 246, 0.20);
  border-radius: 16px;
  background: rgba(59, 130, 246, 0.08);
  color: #24466f;
}

.lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.lang-switch a,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 16px;
  color: #fff;
  background: var(--accent);
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.15s ease, background 0.15s ease;
}

.lang-switch a.secondary,
.btn.secondary {
  color: var(--accent-dark);
  background: rgba(59, 130, 246, 0.10);
}

.lang-switch a:hover,
.btn:hover {
  transform: translateY(-1px);
  background: var(--accent-dark);
}

.lang-switch a.secondary:hover,
.btn.secondary:hover {
  color: #fff;
}

.footer {
  padding: 22px 42px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
  background: #fafbfc;
}

.index-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.index-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.index-card h2 {
  margin: 0 0 8px;
}

.index-card p {
  color: var(--muted);
}

@media (max-width: 680px) {
  .page {
    padding: 24px 12px 44px;
  }
  .hero,
  .content,
  .footer {
    padding-left: 22px;
    padding-right: 22px;
  }
  .index-grid {
    grid-template-columns: 1fr;
  }
}