/* ============================================================
   北京强琳科技中心 — 官网样式
   品牌视觉：深蓝渐变 + 白字（强哥品牌色规范）
   ============================================================ */
:root {
  --navy-deep: #1a1a2e;
  --navy-mid: #16213e;
  --brand-blue: #0f3460;
  --navy-dark: #10172a;
  --tag-bg: rgb(50, 75, 115);
  --text-deep-sub: #aabbcc;
  --bg-page: #f5f5f5;
  --bg-card: #f8f9fa;
  --line: #eeeeee;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  color: #333;
  background: var(--bg-page);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  background: var(--navy-deep);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 32px; height: 32px;
  background: var(--brand-blue);
  color: #fff;
  font-size: 18px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px;
}
.brand-name { color: #fff; font-size: 18px; font-weight: 700; letter-spacing: 1px; }
.site-nav { display: flex; gap: 28px; }
.site-nav a {
  color: var(--text-deep-sub);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.site-nav a:hover { color: #fff; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(180deg, var(--navy-deep) 0%, var(--brand-blue) 100%);
  color: #fff;
  padding: 96px 0 88px;
  text-align: center;
}
.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--text-deep-sub);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: 2px;
}
.hero-sub {
  max-width: 640px;
  margin: 24px auto 36px;
  color: var(--text-deep-sub);
  font-size: 16px;
}
.hero-cta {
  display: inline-block;
  background: #fff;
  color: var(--brand-blue);
  font-weight: 700;
  font-size: 15px;
  padding: 12px 36px;
  border-radius: 999px;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.25); }

/* ---------- Sections ---------- */
.section { padding: 80px 0; background: #fff; }
.section-alt { background: var(--bg-page); }
.section-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--navy-deep);
  padding-left: 14px;
  border-left: 4px solid var(--brand-blue);
  margin-bottom: 16px;
}
.section-desc { max-width: 720px; color: #666; font-size: 15px; }

/* ---------- Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}
.card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 32px 28px;
  border-top: 3px solid var(--brand-blue);
  transition: transform 0.2s;
}
.card:hover { transform: translateY(-4px); }
.card-num { color: var(--brand-blue); font-size: 14px; font-weight: 700; letter-spacing: 1px; }
.card h3 { font-size: 18px; color: var(--navy-deep); margin: 12px 0 10px; }
.card p { font-size: 14px; color: #666; }

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 40px;
  margin-top: 28px;
  max-width: 640px;
}
.contact-item { display: flex; gap: 12px; align-items: baseline; padding-bottom: 16px; border-bottom: 1px dashed var(--line); }
.contact-label { color: #999; font-size: 14px; flex-shrink: 0; width: 84px; }
.contact-value { color: #333; font-size: 15px; font-weight: 500; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-deep); color: #7c8aa5; font-size: 13px; }
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding-top: 28px;
  padding-bottom: 28px;
}
.icp a {
  color: #7c8aa5;
  text-decoration: none;
}
.icp a:hover { color: #fff; }
.copyright { color: #5a6a85; }

/* ---------- Mobile ---------- */
@media (max-width: 768px) {
  .hero { padding: 64px 0 56px; }
  .hero h1 { font-size: 30px; }
  .cards { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .site-nav { gap: 16px; }
  .footer-inner { flex-direction: column; gap: 8px; }
}