/* ===================== 设计令牌（同源系统） ===================== */
:root {
  --blue: #2C4A7C;
  --blue-deep: #1E3A66;
  --blue-footer: #142A4A;
  --blue-overlay: #23426F;
  --border: #5C7BA8;
  --gold: #E8943A;
  --gold-soft: #F4C888;
  --cream: #F4EFE4;
  --white: #FFFFFF;
  --ink: #15212E;
  --muted: #5B6B7E;
  --radius-card: 12px;
  --radius-btn: 8px;
  --shadow-sm: 0 4px 16px rgba(21, 33, 46, 0.08);
  --shadow-md: 0 12px 32px rgba(21, 33, 46, 0.12);
  --container: 1200px;
  --pad-y: 96px;
  --pad-x: 80px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ===================== 顶部导航 ===================== */
.site-header {
  color: #18242f;
  line-height: normal;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--white); font-weight: 700; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--gold); color: var(--blue-footer);
  display: grid; place-items: center; font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; font-size: 18px;
}
.brand-text { font-size: 18px; letter-spacing: 1px; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { color: rgba(255,255,255,0.82); font-size: 15px; transition: color .2s; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-links a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -22px; height: 3px; background: var(--gold);
}
.nav-cta { padding: 9px 18px; font-size: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-btn); font-weight: 500; cursor: pointer;
  border: none; font-family: inherit; transition: all .2s; white-space: nowrap;
}
.btn-gold { background: var(--gold); color: var(--blue-footer); }
.btn-gold:hover { background: var(--gold-soft); }
.btn-primary { background: var(--blue-deep); color: var(--white); padding: 12px 26px; font-size: 15px; }
.btn-primary:hover { background: var(--blue-footer); }
.btn-outline { background: transparent; color: var(--white); border: 1px solid rgba(255,255,255,0.6); padding: 12px 22px; font-size: 15px; }
.btn-outline:hover { background: rgba(255,255,255,0.12); }
/* ===================== 标题区 ===================== */
.page-hero { background: var(--blue); color: var(--white); padding: var(--pad-y) 0 72px; }
.breadcrumb { font-size: 14px; color: rgba(255,255,255,0.7); margin-bottom: 18px; }
.breadcrumb a { color: rgba(255,255,255,0.85); }
.breadcrumb span { margin: 0 8px; }
.kicker { font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; letter-spacing: 3px; color: var(--gold); font-size: 15px; margin-bottom: 12px; }
.page-title { font-size: 42px; font-weight: 700; line-height: 1.25; margin-bottom: 18px; }
.page-sub { max-width: 720px; font-size: 16px; color: rgba(255,255,255,0.86); }

/* ===================== 通用版块 ===================== */
.section { padding: var(--pad-y) 0; }
.section-title { font-size: 30px; font-weight: 700; color: var(--blue-footer); margin-bottom: 14px; }
.section-title.center { text-align: center; margin-bottom: 44px; }

/* ===================== 公司概况 ===================== */
.overview { background: var(--cream); }
.overview-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.overview-text .lead { font-size: 17px; color: var(--ink); margin: 6px 0 16px; }
.overview-text p { color: var(--muted); margin-bottom: 14px; }
.check-list { list-style: none; margin: 8px 0 26px; display: grid; gap: 10px; }
.check-list li { position: relative; padding-left: 28px; color: var(--ink); font-size: 15px; }
.check-list li::before {
  content: '✓'; position: absolute; left: 0; top: 2px;
  width: 19px; height: 19px; border-radius: 50%; background: var(--gold); color: var(--blue-footer);
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
}
.overview-media { position: relative; }
.media-frame {
  width: 100%; aspect-ratio: 4/3; border-radius: var(--radius-card);
  box-shadow: var(--shadow-md); background: linear-gradient(135deg, #23426F 0%, #10203A 100%);
}
.media-badge {
  position: absolute; right: -16px; bottom: -22px;
  background: var(--gold); color: var(--blue-footer); border-radius: var(--radius-card);
  padding: 16px 22px; box-shadow: var(--shadow-md); text-align: center;
}
.badge-num { display: block; font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; font-size: 34px; font-weight: 700; line-height: 1; }
.badge-num span { font-size: 16px; }
.badge-label { font-size: 13px; }

/* ===================== 数据指标条 ===================== */
.stats-band { background: var(--blue-overlay); color: var(--white); padding: 56px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-num { display: block; font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; font-size: 48px; font-weight: 700; color: var(--gold); line-height: 1; }
.stat-label { font-size: 15px; color: rgba(255,255,255,0.85); margin-top: 8px; display: block; }

/* ===================== 发展历程 ===================== */
.timeline-section { background: var(--white); }
.timeline { list-style: none; position: relative; max-width: 860px; margin: 0 auto; padding-left: 0; }
.timeline::before {
  content: ''; position: absolute; left: 90px; top: 8px; bottom: 8px; width: 2px; background: rgba(92,123,168,0.35);
}
.tl-item { position: relative; display: grid; grid-template-columns: 90px 1fr; gap: 28px; padding: 14px 0; }
.tl-year { font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; font-size: 26px; font-weight: 700; color: var(--blue-deep); text-align: right; }
.tl-item::after {
  content: ''; position: absolute; left: 84px; top: 24px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--gold); border: 3px solid var(--white); box-shadow: 0 0 0 2px var(--gold);
}
.tl-card { background: var(--cream); border-radius: var(--radius-card); padding: 18px 22px; box-shadow: var(--shadow-sm); }
.tl-card h3 { font-size: 18px; color: var(--blue-footer); margin-bottom: 6px; }
.tl-card p { color: var(--muted); font-size: 15px; }

/* ===================== 资质荣誉 ===================== */
.honors-section { background: var(--cream); }
.honor-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.honor-card {
  background: var(--white); border-radius: var(--radius-card); padding: 30px 26px;
  box-shadow: var(--shadow-sm); border: 1px solid rgba(92,123,168,0.18); transition: transform .2s, box-shadow .2s;
}
.honor-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.honor-icon { font-size: 30px; display: block; margin-bottom: 14px; }
.honor-card h3 { font-size: 18px; color: var(--blue-footer); margin-bottom: 6px; }
.honor-card p { color: var(--muted); font-size: 14px; }

/* ===================== 业务板块 ===================== */
.business-section { background: var(--white); }
.biz-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.biz-card {
  background: var(--blue); color: var(--white); border-radius: var(--radius-card);
  padding: 30px 24px; text-align: center; transition: transform .2s, background .2s;
}
.biz-card:hover { transform: translateY(-4px); background: var(--blue-deep); }
.biz-icon { font-size: 34px; margin-bottom: 14px; }
.biz-card h3 { font-size: 19px; margin-bottom: 10px; }
.biz-card p { font-size: 14px; color: rgba(255,255,255,0.85); }
.biz-icon { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 22px; color: var(--gold); letter-spacing: 1px; }

/* ===================== 项目展示 ===================== */
.projects-section { background: var(--white); }
.project-media-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 44px; }
.project-media-grid figure { margin: 0; }
.project-media-grid img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: var(--radius-card); box-shadow: var(--shadow-md); }
.project-media-grid figcaption { margin-top: 12px; font-size: 16px; font-weight: 600; color: var(--blue-footer); }
.project-table-wrap { overflow-x: auto; border: 1px solid rgba(92,123,168,0.2); border-radius: var(--radius-card); }
.project-table-wrap table { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 14px; }
.project-table-wrap th, .project-table-wrap td { padding: 14px 18px; text-align: left; border-bottom: 1px solid rgba(92,123,168,0.16); }
.project-table-wrap th { background: var(--blue-deep); color: var(--white); font-weight: 500; }
.project-table-wrap tr:last-child td { border-bottom: 0; }
.project-table-wrap tbody tr:nth-child(even) { background: var(--cream); }
.project-table-wrap td:nth-child(2), .project-table-wrap td:nth-child(3) { white-space: nowrap; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }

/* ===================== 企业文化 ===================== */
.culture-section { background: var(--cream); }
.culture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.culture-card {
  background: var(--white); border-top: 3px solid var(--gold); border-radius: var(--radius-card);
  padding: 30px 26px; box-shadow: var(--shadow-sm);
}
.culture-card h3 { font-size: 22px; color: var(--blue-footer); margin-bottom: 12px; font-family: system-ui, -apple-system, 'Segoe UI', 'Microsoft YaHei', sans-serif; }
.culture-card p { color: var(--muted); font-size: 15px; }

/* ===================== 合作伙伴 ===================== */
.partners-section { background: var(--white); }
.partner-wall { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.partner-logo {
  aspect-ratio: 16/9; border-radius: var(--radius-card); border: 1px solid rgba(92,123,168,0.25);
  display: grid; place-items: center; font-size: 14px; color: var(--muted);
  background: linear-gradient(135deg, rgba(44,74,124,0.08), rgba(232,148,58,0.10));
}

/* ===================== 底部 CTA ===================== */
.cta-band { background: var(--blue-deep); color: var(--white); padding: 64px 0; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-inner h2 { font-size: 26px; margin-bottom: 8px; }
.cta-inner p { color: rgba(255,255,255,0.85); }
.cta-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; }
.footer-col h4 { color: var(--white); font-size: 16px; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14px; color: rgba(255,255,255,0.72); padding: 5px 0; transition: color .2s; }
.footer-col a:hover { color: var(--gold); }
.footer-desc { font-size: 14px; margin-top: 14px; max-width: 280px; }
.footer-mini { font-size: 13px; margin-bottom: 10px; }
.footer-qr { width: 96px; height: 96px; border-radius: 8px; background: linear-gradient(135deg, #23426F, #10203A); }
/* ===================== 返回顶部 ===================== */
.back-top {
  position: fixed; right: 24px; bottom: 24px; width: 46px; height: 46px; border-radius: 50%;
  background: var(--gold); color: var(--blue-footer); border: none; font-size: 20px; cursor: pointer;
  box-shadow: var(--shadow-md); opacity: 0; pointer-events: none; transition: opacity .3s, transform .3s; z-index: 40;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { transform: translateY(-3px); }

/* ===================== 响应式 ===================== */
@media (max-width: 1024px) {
  .overview-grid { grid-template-columns: 1fr; gap: 40px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 36px 24px; }
  .honor-grid, .culture-grid { grid-template-columns: repeat(2, 1fr); }
  .biz-grid { grid-template-columns: repeat(2, 1fr); }
  .partner-wall { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --pad-y: 64px; --pad-x: 24px; }
  .nav-links {
    position: absolute; top: 72px; left: 0; right: 0; background: var(--blue-deep);
    flex-direction: column; gap: 0; padding: 8px 24px 16px; display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 0; border-bottom: 1px solid rgba(255,255,255,0.1); }
  .nav-links a.active::after { display: none; }
  .nav-cta { display: none; }
  .page-title { font-size: 30px; }
  .section-title { font-size: 24px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .honor-grid, .culture-grid, .biz-grid { grid-template-columns: 1fr; }
  .partner-wall { grid-template-columns: repeat(2, 1fr); }
  .project-media-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .timeline::before { left: 60px; }
  .tl-item { grid-template-columns: 60px 1fr; gap: 18px; }
  .tl-item::after { left: 54px; }
  .tl-year { font-size: 20px; }
  .media-badge { right: 8px; }
}