/* 筑邦资质城市落地页共享样式（无 Google Fonts，系统字体栈，国内秒开） */
:root {
  --primary: #2d8b8b;
  --primary-dark: #1a2332;
  --primary-darker: #0f172a;
  --primary-light: #4a9d9d;
  --primary-lighter: #a8dadc;
  --primary-bg: #e8f4f5;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-600: #475569;
  --gray-900: #0f172a;
  --radius: 14px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --shadow: 0 8px 30px rgba(15, 35, 50, .08);
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  color: var(--gray-900);
  background: var(--gray-50);
  line-height: 1.75;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 顶部导航 */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--gray-200);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 20px; color: var(--primary-dark); }
.logo img { height: 34px; width: auto; }
.logo small { font-size: 12px; color: var(--gray-600); font-weight: 400; display: block; line-height: 1.2; }
.city-nav { display: flex; flex-wrap: wrap; gap: 6px; }
.city-nav a {
  font-size: 13px; padding: 5px 10px; border-radius: 999px;
  color: var(--gray-600); background: var(--gray-100); transition: .2s;
}
.city-nav a:hover, .city-nav a.active { color: #fff; background: var(--primary); }

/* 英雄区 */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff; padding: 64px 0 56px;
}
.hero h1 { font-size: 34px; line-height: 1.3; font-weight: 800; margin-bottom: 16px; }
.hero p.sub { font-size: 17px; opacity: .95; max-width: 720px; margin-bottom: 26px; }
.hero .hero-img { width: 100%; border-radius: var(--radius); margin-top: 28px; box-shadow: var(--shadow); }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-block; padding: 14px 26px; border-radius: 999px;
  font-weight: 600; font-size: 16px; transition: .2s;
}
.btn-primary { background: #fff; color: var(--primary-dark); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,.15); }
.btn-ghost { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.25); }

/* 通用区块 */
.section { padding: 56px 0; }
.section.alt { background: #fff; }
.section-title { text-align: center; font-size: 26px; font-weight: 800; color: var(--primary-dark); margin-bottom: 10px; }
.section-desc { text-align: center; color: var(--gray-600); max-width: 720px; margin: 0 auto 36px; }

/* 卡片网格 */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.card .ico { width: 46px; height: 46px; border-radius: 12px; background: var(--primary-bg); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 22px; margin-bottom: 14px; }
.card h3 { font-size: 18px; margin-bottom: 8px; color: var(--primary-dark); }
.card p { color: var(--gray-600); font-size: 15px; }

/* 服务列表 */
.svc-list { display: grid; gap: 16px; grid-template-columns: repeat(2, 1fr); }
.svc-item { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: var(--radius-sm); padding: 18px 20px; }
.svc-item h3 { color: var(--primary); font-size: 17px; margin-bottom: 6px; }
.svc-item ul { margin: 8px 0 0 18px; color: var(--gray-600); font-size: 14px; }
.svc-item ul li { margin: 3px 0; }

/* 本地网点 */
.branch { background: linear-gradient(135deg, var(--primary-bg), #dbeafe); border-radius: var(--radius); padding: 32px; }
.branch h3 { color: var(--primary-dark); font-size: 20px; margin-bottom: 12px; }
.branch p { color: var(--gray-600); }
.branch .stat { display: inline-block; margin-top: 14px; background: #fff; border-radius: 999px; padding: 8px 16px; color: var(--primary); font-weight: 600; font-size: 14px; }

/* FAQ */
.faq-item { background: #fff; border: 1px solid var(--gray-200); border-radius: var(--radius-sm); padding: 18px 22px; margin-bottom: 12px; }
.faq-item h3 { font-size: 16px; color: var(--primary-dark); margin-bottom: 8px; }
.faq-item p { color: var(--gray-600); font-size: 15px; }

/* 案例 */
.case-card { overflow: hidden; }
.case-card img { width: 100%; height: 200px; object-fit: cover; }
.case-card .body { padding: 18px; }
.case-card .body h3 { font-size: 17px; color: var(--primary-dark); margin-bottom: 6px; }
.case-card .body p { color: var(--gray-600); font-size: 14px; }
.tag { display: inline-block; background: var(--primary-bg); color: var(--primary); font-size: 12px; padding: 3px 10px; border-radius: 999px; margin-bottom: 10px; }

/* 底部 CTA */
.cta-final { background: linear-gradient(135deg, var(--primary-darker), var(--primary-dark)); color: #fff; text-align: center; padding: 56px 0; }
.cta-final h2 { font-size: 26px; margin-bottom: 12px; }
.cta-final p { opacity: .9; margin-bottom: 24px; }

/* 页脚 */
.site-footer { background: var(--gray-900); color: #cbd5e1; padding: 40px 0 28px; font-size: 14px; }
.site-footer .container { display: grid; gap: 24px; grid-template-columns: 1.4fr 1fr; }
.site-footer h4 { color: #fff; margin-bottom: 12px; font-size: 15px; }
.site-footer a { color: #cbd5e1; }
.site-footer a:hover { color: #fff; }
.footer-cities { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-cities a { background: rgba(255,255,255,.08); padding: 5px 12px; border-radius: 999px; }
.copyright { border-top: 1px solid rgba(255,255,255,.12); margin-top: 24px; padding-top: 16px; text-align: center; color: #94a3b8; font-size: 13px; }

/* 响应式 */
@media (max-width: 860px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .svc-list { grid-template-columns: 1fr; }
  .hero h1 { font-size: 27px; }
  .site-footer .container { grid-template-columns: 1fr; }
  .city-nav { display: none; }
}
@media (max-width: 520px) {
  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .hero { padding: 44px 0 40px; }
  .section { padding: 40px 0; }
}