:root {
  --bg: #f6f8fb;
  --card: rgba(255, 255, 255, 0.92);
  --text: #182033;
  --muted: #667085;
  --line: #e6eaf0;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-soft: #eaf1ff;
  --success-soft: #ecfdf3;
  --shadow: 0 20px 60px rgba(31, 41, 55, 0.10);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(37, 99, 235, 0.14), transparent 32%),
    radial-gradient(circle at 90% 0%, rgba(14, 165, 233, 0.16), transparent 28%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 48%, #eef3fb 100%);
  line-height: 1.75;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.site-header {
  max-width: 960px;
  margin: 0 auto;
  padding: 72px 22px 28px;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 999px;
  background: var(--primary-soft);
  color: #1e40af;
  font-size: 14px;
  font-weight: 600;
}

.site-header h1 {
  margin: 22px 0 12px;
  font-size: clamp(36px, 7vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.05em;
}

.subtitle {
  max-width: 680px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 18px;
}

.site-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid var(--line);
  color: var(--text);
  font-weight: 650;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.nav-button.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.nav-button:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.page {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto 48px;
}

.card {
  background: var(--card);
  border: 1px solid rgba(230, 234, 240, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 48px);
  backdrop-filter: blur(18px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.link-card {
  display: block;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #ffffff;
  color: var(--text);
  transition: 0.18s ease;
}

.link-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.10);
  text-decoration: none;
}

.link-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 20px;
}

.link-card span {
  color: var(--muted);
}

.section {
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

h2 {
  margin: 0 0 12px;
  font-size: 26px;
  letter-spacing: -0.03em;
}

h3 {
  margin: 22px 0 8px;
  font-size: 18px;
}

p {
  margin: 10px 0;
}

.muted {
  color: var(--muted);
}

.info-box {
  margin: 20px 0;
  padding: 18px 20px;
  border-radius: 18px;
  background: var(--success-soft);
  border: 1px solid #bbf7d0;
}

.contact-box {
  margin-top: 18px;
  padding: 22px;
  border-radius: 20px;
  background: #ffffff;
  border: 1px solid var(--line);
}

.email {
  display: inline-flex;
  margin-top: 8px;
  padding: 10px 14px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: #1e40af;
  font-weight: 700;
}

.back-link {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--muted);
  font-weight: 650;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 20px;
}

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 22px 46px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 720px) {
  .site-header {
    padding-top: 48px;
  }

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

  .card {
    border-radius: 20px;
  }
}