/* ===== v6 兴龙升弱电 — 高端专业版 ===== */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Inter:wght@400;600;700;900&display=swap');

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans SC', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  background: #faf8f4;
  color: #1a2332;
  margin: 0;
  line-height: 1.7;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

:root {
  --navy: #1a3a6e;
  --navy-dark: #0c2247;
  --navy-light: #2a5298;
  --beige: #f5ecdc;
  --beige-dark: #e8d9b8;
  --gold: #c89b3c;
  --text: #1a2332;
  --text-dim: #6b7280;
  --line: #e3d9c4;
}
a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--navy-light); }

/* === Nav === */
.v6-nav {
  position: fixed; top: 0; left: 0; right: 0;
  background: rgba(12, 34, 71, 0.95);
  backdrop-filter: blur(12px);
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.v6-nav-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 72px; padding: 0 32px;
}
.v6-logo { display: flex; align-items: center; gap: 12px; color: white; }
.v6-logo-mark {
  width: 44px; height: 44px;
  background: white; color: var(--navy);
  display: flex; align-items: center; justify-content: center;
  font-weight: 900; font-size: 24px;
  font-family: 'Inter', sans-serif;
}
.v6-logo-text { font-size: 17px; font-weight: 700; line-height: 1.2; }
.v6-logo-text small { display: block; font-size: 11px; font-weight: 400; opacity: 0.7; }
.v6-nav-links { display: flex; gap: 32px; }
.v6-nav-links a { color: rgba(255, 255, 255, 0.85); font-size: 14px; padding: 8px 0; transition: color 0.2s; }
.v6-nav-links a:hover, .v6-nav-links a.active { color: var(--gold); }
.v6-nav-phone { color: white; font-weight: 700; font-size: 16px; padding: 8px 16px; border: 1px solid var(--gold); border-radius: 2px; }

/* === Hero (太空夜景 - 高端感爆表) === */
.v6-hero {
  position: relative;
  height: 100vh; min-height: 700px;
  background: url('img/space-tech.jpg') center/cover no-repeat;
  display: flex; align-items: flex-end;
  color: white;
  margin-top: 72px;
}
.v6-hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.1) 30%, rgba(12,34,71,0.95) 100%);
}
.v6-hero-content {
  position: relative; max-width: 1280px; margin: 0 auto; width: 100%;
  padding: 80px 32px 100px;
  z-index: 2;
}
.v6-hero-tag {
  display: inline-block; padding: 6px 14px;
  background: var(--gold); color: var(--navy-dark);
  font-size: 13px; font-weight: 700; letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.v6-hero h1 {
  font-size: 72px; font-weight: 900; line-height: 1.05;
  margin: 0 0 24px; max-width: 980px;
  letter-spacing: -0.02em;
  text-shadow: 0 2px 24px rgba(0,0,0,0.5);
}
.v6-hero h1 span { color: var(--gold); }
.v6-hero-sub {
  font-size: 18px; max-width: 720px;
  line-height: 1.7; opacity: 0.95;
  margin-bottom: 32px;
  text-shadow: 0 1px 8px rgba(0,0,0,0.3);
}
.v6-hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.v6-btn {
  display: inline-block; padding: 14px 28px;
  font-weight: 700; font-size: 15px;
  border-radius: 0;
  text-transform: uppercase; letter-spacing: 0.04em;
  text-decoration: none; transition: all 0.2s;
  border: none;
}
.v6-btn-primary { background: var(--gold); color: var(--navy-dark); }
.v6-btn-primary:hover { background: #d4a93e; color: var(--navy-dark); text-decoration: none; }
.v6-btn-outline { background: transparent; color: white; border: 2px solid white; }
.v6-btn-outline:hover { background: white; color: var(--navy-dark); text-decoration: none; }

/* === Strip === */
.v6-strip {
  background: var(--navy-dark); color: rgba(255,255,255,0.9);
  padding: 24px 32px;
  display: flex; justify-content: space-around;
  flex-wrap: wrap; gap: 32px;
  font-size: 13px; border-bottom: 1px solid rgba(255,255,255,0.08);
}
.v6-strip-item { text-align: center; }
.v6-strip-item strong { color: var(--gold); font-size: 26px; font-weight: 900; display: block; font-family: 'Inter', sans-serif; }

/* === Section === */
.v6-container { max-width: 1280px; margin: 0 auto; }
.v6-section-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 56px; padding-bottom: 24px;
  border-bottom: 2px solid currentColor;
}
.v6-section-head h2 { font-size: 48px; font-weight: 900; letter-spacing: -0.02em; margin: 0; }
.v6-section-head h2 small { display: block; font-size: 14px; font-weight: 400; color: var(--gold); letter-spacing: 0.1em; margin-bottom: 8px; }
.v6-section-head .v6-aside { text-align: right; font-size: 14px; max-width: 360px; color: var(--text-dim); }

/* === 8 大业务(4 列 × 2 行网格) === */
.v6-service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.v6-service-card {
  background: white;
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.3s;
  display: block;
}
.v6-service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 36px rgba(26, 58, 110, 0.18);
}
.v6-service-img {
  position: relative;
  background-size: cover;
  background-position: center;
  aspect-ratio: 4/3;
}
.v6-service-num {
  position: absolute; top: 12px; left: 12px;
  background: var(--gold); color: var(--navy-dark);
  padding: 4px 10px; font-weight: 700; font-size: 11px;
  font-family: 'Inter', sans-serif;
  letter-spacing: 0.05em;
}
.v6-service-info { padding: 18px 20px 22px; }
.v6-service-info h3 { font-size: 18px; margin: 0 0 6px; color: var(--navy-dark); font-weight: 700; }
.v6-service-info p { font-size: 13px; color: var(--text-dim); margin: 0; }

/* === 案例网格 === */
.v6-case-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.v6-case {
  background: white;
  border: 1px solid var(--line);
  overflow: hidden;
  transition: transform 0.3s;
}
.v6-case:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(26, 58, 110, 0.15);
}
.v6-case-img {
  position: relative;
  background-size: cover; background-position: center;
  aspect-ratio: 4/3;
}
.v6-case-tag {
  position: absolute; top: 12px; right: 12px;
  background: var(--gold); color: var(--navy-dark);
  padding: 3px 10px; font-size: 11px; font-weight: 700;
  font-family: 'Inter', sans-serif;
}
.v6-case-body { padding: 18px 20px 22px; }
.v6-case-body h4 { font-size: 16px; margin: 0 0 6px; color: var(--navy-dark); font-weight: 700; }
.v6-case-body p { font-size: 12px; color: var(--text-dim); margin: 0; line-height: 1.55; }

/* === 客户墙 === */
.v6-client-tags {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-top: 24px;
}
.v6-client-tag {
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid rgba(200, 155, 60, 0.3);
}
.v6-client-tag:hover {
  background: rgba(200, 155, 60, 0.2);
  color: var(--gold);
}

/* === Promises === */
.v6-promises {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.v6-promise {
  border-top: 3px solid var(--gold);
  padding-top: 24px;
}
.v6-promise-num {
  font-size: 48px; font-weight: 900;
  font-family: 'Inter', sans-serif;
  color: var(--gold);
  line-height: 1;
  margin-bottom: 16px;
}
.v6-promise h5 { font-size: 18px; margin: 0 0 8px; color: var(--navy-dark); }
.v6-promise p { font-size: 14px; color: var(--text-dim); margin: 0; line-height: 1.65; }

/* === About === */
.v6-about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.v6-about-text h2 { font-size: 48px; line-height: 1.15; margin: 0 0 16px; }
.v6-about-text h2 span { color: var(--gold); }
.v6-about-text p { font-size: 15px; color: var(--text-dim); margin-bottom: 16px; line-height: 1.85; }
.v6-about-img {
  background: linear-gradient(rgba(12,34,71,0.15), rgba(12,34,71,0.15)), url('img/dc-tech.jpg') center/cover;
  aspect-ratio: 4/5;
  border-radius: 0;
  box-shadow: 12px 12px 0 var(--gold);
}
.v6-cta {
  display: inline-block;
  color: var(--navy);
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === Footer === */
.v6-footer { background: var(--navy-dark); color: rgba(255,255,255,0.75); padding: 60px 32px 24px; font-size: 13px; }
.v6-footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.v6-footer h5 { color: var(--gold); font-size: 13px; letter-spacing: 0.1em; margin: 0 0 14px; }
.v6-footer p { margin: 4px 0; line-height: 1.7; }
.v6-footer-bottom { padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.1); text-align: center; color: rgba(255,255,255,0.5); }

/* === Responsive === */
@media (max-width: 1024px) {
  .v6-hero h1 { font-size: 48px; }
  .v6-service-grid { grid-template-columns: repeat(2, 1fr); }
  .v6-case-grid { grid-template-columns: repeat(2, 1fr); }
  .v6-promises { grid-template-columns: repeat(2, 1fr); }
  .v6-about { grid-template-columns: 1fr; gap: 32px; }
  .v6-section-head { flex-direction: column; align-items: flex-start; gap: 16px; }
  .v6-footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .v6-nav-links { display: none; }
  .v6-hero h1 { font-size: 32px; }
  .v6-service-grid { grid-template-columns: 1fr; }
  .v6-case-grid { grid-template-columns: 1fr; }
  .v6-promises { grid-template-columns: 1fr; }
  .v6-strip { padding: 16px 20px; }
  .v6-strip-item strong { font-size: 20px; }
  .v6-footer-grid { grid-template-columns: 1fr; }
}