/* 与主站保持相同的 CSS 变量 */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --accent: #06b6d4;
  --dark: #0f172a;
  --gray: #64748b;
  --light: #f8fafc;
  --white: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.8;
  font-size: 16px;
}

/* ── Nav（与主站一致：白色玻璃效果） ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  height: 64px; display: flex; align-items: center;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; width: 100%;
  padding: 0 32px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-size: 20px; font-weight: 700; color: var(--primary);
  letter-spacing: 1px; text-decoration: none;
}
.nav-logo span { color: var(--accent); }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
  text-decoration: none; color: var(--gray); font-size: 15px;
  font-weight: 500; transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* ── Page header（子页面深色 banner） ── */
.page-header {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0e7490 100%);
  color: white; padding: 110px 32px 60px; text-align: center;
  margin-top: 64px; position: relative; overflow: hidden;
}
.page-header::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 50%, rgba(6,182,212,0.15) 0%, transparent 60%);
}
.page-header h1 { font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin-bottom: 12px; position: relative; }
.page-header p  { font-size: 16px; opacity: .75; max-width: 600px; margin: 0 auto; position: relative; }

/* ── Container ── */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 72px 32px 96px;
}

/* ── Prose 文章正文 ── */
.prose h2 {
  font-size: 22px; font-weight: 700; color: var(--dark);
  margin: 44px 0 14px; padding-left: 14px;
  border-left: 4px solid var(--primary);
}
.prose h3 { font-size: 18px; font-weight: 600; color: var(--dark); margin: 28px 0 10px; }
.prose p  { margin-bottom: 16px; color: #334155; }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 16px; }
.prose li { margin-bottom: 8px; color: #334155; }
.prose strong { color: var(--dark); }
.prose a { color: var(--primary); text-decoration: underline; }
.prose table {
  width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 15px;
}
.prose th {
  background: var(--dark); color: white; padding: 10px 16px; text-align: left; font-weight: 600;
}
.prose td { padding: 10px 16px; border-bottom: 1px solid #e2e8f0; }
.prose tr:nth-child(even) td { background: var(--light); }
.prose .tip {
  background: #eff6ff; border-left: 4px solid var(--primary);
  padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 24px 0; color: #1e40af;
}

/* ── Blog card grid ── */
.blog-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px;
  margin-top: 48px;
}
.blog-card {
  border: 1px solid #e2e8f0; border-radius: 16px; padding: 28px 24px;
  text-decoration: none; color: inherit;
  transition: box-shadow .25s, transform .25s; display: block;
}
.blog-card:hover { box-shadow: 0 12px 32px rgba(37,99,235,0.12); transform: translateY(-4px); }
.blog-card .tag {
  font-size: 12px; background: #dbeafe; color: var(--primary);
  border-radius: 100px; padding: 3px 10px; display: inline-block; margin-bottom: 12px;
  font-weight: 500;
}
.blog-card h3 { font-size: 16px; color: var(--dark); margin-bottom: 10px; line-height: 1.5; font-weight: 700; }
.blog-card p  { font-size: 14px; color: var(--gray); line-height: 1.7; }

/* ── Contact grid ── */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; margin-top: 48px;
}
.info-item { margin-bottom: 20px; }
.info-item .label { font-size: 13px; color: var(--gray); margin-bottom: 4px; font-weight: 500; }
.info-item .value { font-size: 16px; color: var(--dark); font-weight: 700; }
.faq-item { margin-bottom: 28px; padding-bottom: 28px; border-bottom: 1px solid #e2e8f0; }
.faq-item:last-child { border-bottom: none; }
.faq-item h4 { color: var(--dark); margin-bottom: 8px; font-size: 16px; }
.faq-item p  { color: var(--gray); font-size: 15px; line-height: 1.7; }

/* ── Footer（与主站一致） ── */
footer { background: var(--dark); color: white; padding: 48px 32px 0; }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-text { font-size: 22px; font-weight: 700; color: var(--primary); margin-bottom: 16px; display: block; }
.footer-brand .logo-text span { color: var(--accent); }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,0.5); line-height: 1.8; }
.footer-links-col h4 { font-size: 15px; font-weight: 600; margin-bottom: 16px; }
.footer-links-col a {
  display: block; color: rgba(255,255,255,0.5); text-decoration: none;
  font-size: 14px; margin-bottom: 10px; transition: color .2s;
}
.footer-links-col a:hover { color: white; }
.copyright {
  max-width: 1200px; margin: 0 auto;
  padding: 20px 0; text-align: center;
  font-size: 13px; color: rgba(255,255,255,0.3);
}
.copyright a { color: rgba(255,255,255,0.3); text-decoration: none; }
.copyright a:hover { color: rgba(255,255,255,0.6); }

@media (max-width: 768px) {
  .contact-grid, .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .nav-links { gap: 18px; }
  .nav-links a { font-size: 14px; }
  .container { padding: 48px 20px 64px; }
}