/* ============ 主题变量（后续改配色只需改这里） ============ */
:root {
  --primary: #00549d;
  --primary-dark: #003f76;
  --primary-light: #e8f1fa;
  --accent: #009688;
  --accent-dark: #00796b;
  --bg: #ffffff;
  --bg-alt: #f5f8fb;
  --text: #2b2f36;
  --text-light: #5c6670;
  --border: #e5ecf2;
  --shadow: 0 8px 30px rgba(0, 42, 84, 0.10);
  --shadow-sm: 0 3px 14px rgba(0, 42, 84, 0.08);
  --radius: 14px;
  --nav-h: 74px;
  --font: "Microsoft YaHei", "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", sans-serif;
}

/* ============ 基础 ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ============ 顶部导航 ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid transparent;
  transition: box-shadow .3s, border-color .3s;
}
.site-header.scrolled {
  box-shadow: var(--shadow-sm);
  border-color: var(--border);
}
.header-inner {
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { height: 46px; width: auto; }
.brand-name { font-size: 19px; font-weight: 800; color: var(--primary-dark); line-height: 1.2; }
.brand-name small { display: block; font-size: 11px; font-weight: 600; color: var(--text-light); letter-spacing: .4px; }
.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav a {
  padding: 8px 14px; font-size: 15px; font-weight: 600; color: var(--text);
  border-radius: 8px; transition: color .2s, background .2s;
}
.main-nav a:hover, .main-nav a.active { color: var(--primary); background: var(--primary-light); }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch {
  border: 1.5px solid var(--primary); color: var(--primary); background: #fff;
  padding: 6px 14px; border-radius: 999px; font-size: 14px; font-weight: 700;
  cursor: pointer; transition: all .2s;
}
.lang-switch:hover { background: var(--primary); color: #fff; }
.nav-toggle { display: none; border: 0; background: none; font-size: 26px; color: var(--primary-dark); cursor: pointer; }

/* ============ 首页 Hero 轮播 ============ */
.hero { position: relative; margin-top: var(--nav-h); height: 620px; overflow: hidden; }
.hero-slide {
  position: absolute; inset: 0; opacity: 0; visibility: hidden;
  background-size: cover; background-position: center;
  transition: opacity 1s ease, visibility 1s;
}
.hero-slide.active { opacity: 1; visibility: visible; }
.hero-slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(0, 26, 54, 0.72) 0%, rgba(0, 26, 54, 0.45) 55%, rgba(0, 26, 54, 0.10) 100%);
}
.hero-content {
  position: relative; z-index: 2; height: 100%;
  display: flex; flex-direction: column; justify-content: center; max-width: 1200px; margin: 0 auto; padding: 0 24px;
  color: #fff;
}
.hero-kicker {
  display: inline-block; align-self: flex-start; font-size: 13px; letter-spacing: 2px;
  color: var(--accent); font-weight: 700; margin-bottom: 14px;
  padding: 5px 14px; border: 1px solid rgba(255, 255, 255, 0.35); border-radius: 999px;
  background: rgba(0, 0, 0, 0.18);
}
.hero-title { font-size: 44px; font-weight: 800; line-height: 1.25; margin-bottom: 16px; max-width: 760px; }
.hero-text { font-size: 17px; color: rgba(255, 255, 255, 0.92); max-width: 620px; margin-bottom: 30px; }
.hero-cta {
  align-self: flex-start; display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; font-size: 16px; font-weight: 700;
  padding: 13px 30px; border-radius: 999px; transition: background .2s, transform .2s;
}
.hero-cta:hover { background: var(--accent-dark); transform: translateY(-2px); }
.hero-dots {
  position: absolute; bottom: 26px; left: 0; right: 0; z-index: 3;
  display: flex; justify-content: center; gap: 10px;
}
.hero-dots button {
  width: 12px; height: 12px; border-radius: 50%; border: 0; cursor: pointer;
  background: rgba(255, 255, 255, 0.45); transition: all .25s;
}
.hero-dots button.active { background: var(--accent); transform: scale(1.25); }
.hero-case-link {
  position: absolute; left: 24px; bottom: 26px; z-index: 3;
  color: #fff; font-size: 15px; font-weight: 600; padding: 9px 20px;
  border: 1px solid rgba(255, 255, 255, 0.45); border-radius: 999px;
  background: rgba(0, 0, 0, 0.18); transition: background .2s, border-color .2s;
}
.hero-case-link:hover { background: var(--accent); border-color: var(--accent); }

/* ============ 通用区块 ============ */
.section { padding: 88px 0; }
.section.alt { background: var(--bg-alt); }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
.sec-kicker { color: var(--primary); font-size: 14px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; }
.sec-title { font-size: 34px; font-weight: 800; color: var(--primary-dark); margin: 10px 0 14px; }
.sec-desc { color: var(--text-light); font-size: 16px; }
.sec-line { width: 56px; height: 4px; background: var(--accent); border-radius: 2px; margin: 18px auto 0; }

/* ============ 数据指标 ============ */
.stats { background: linear-gradient(120deg, var(--primary-dark), var(--primary)); color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.stat .num { font-size: 48px; font-weight: 800; color: var(--accent); line-height: 1.1; }
.stat .label { margin-top: 8px; font-size: 15px; color: rgba(255, 255, 255, 0.88); }

/* ============ 核心服务三大入口 ============ */
.core-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.core-card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 36px 30px; box-shadow: var(--shadow-sm); transition: transform .25s, box-shadow .25s;
  position: relative; overflow: hidden;
}
.core-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.core-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.core-num {
  width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
  background: var(--primary-light); color: var(--primary); font-size: 22px; font-weight: 800; margin-bottom: 20px;
}
.core-card h3 { font-size: 20px; color: var(--primary-dark); margin-bottom: 12px; }
.core-card p { color: var(--text-light); font-size: 15px; }

/* ============ 服务板块预览 ============ */
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.svc-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s;
}
.svc-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.svc-card img { height: 190px; width: 100%; object-fit: cover; }
.svc-card-body { padding: 24px 24px 28px; }
.svc-card-body h3 { font-size: 18px; color: var(--primary-dark); margin-bottom: 10px; }
.svc-card-body p { font-size: 14.5px; color: var(--text-light); }
.svc-card .more { display: inline-flex; align-items: center; gap: 6px; margin-top: 16px; color: var(--primary); font-weight: 700; font-size: 14px; }
.svc-card .more::after { content: "→"; transition: transform .2s; }
.svc-card:hover .more::after { transform: translateX(4px); }

/* ============ 案例 ============ */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card { position: relative; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.case-card img { height: 260px; width: 100%; object-fit: cover; transition: transform .5s; }
.case-card:hover img { transform: scale(1.06); }
.case-overlay {
  position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end;
  padding: 22px; color: #fff; background: linear-gradient(0deg, rgba(0, 20, 44, 0.82) 0%, rgba(0, 20, 44, 0) 60%);
}
.case-overlay h3 { font-size: 19px; margin-bottom: 6px; }
.case-overlay p { font-size: 13.5px; color: rgba(255, 255, 255, 0.85); }

/* ============ CTA 横幅 ============ */
.cta-band { background: linear-gradient(120deg, var(--accent), #4fc3a7); color: #fff; }
.cta-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cta-inner h2 { font-size: 28px; font-weight: 800; }
.cta-inner p { font-size: 16px; opacity: .95; margin-top: 6px; }
.cta-phone {
  display: inline-block; background: #fff; color: var(--accent-dark);
  font-size: 20px; font-weight: 800; padding: 10px 36px; border-radius: 999px;
  transition: transform .2s;
}
.cta-phone:hover { transform: translateY(-2px); }

/* ============ 页脚 ============ */
.site-footer { background: #0d2a47; color: rgba(255, 255, 255, 0.82); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr; gap: 48px; padding: 64px 0 44px; }
.footer h4 { color: #fff; font-size: 16px; margin-bottom: 18px; letter-spacing: 1px; }
.footer-about p { font-size: 14px; line-height: 1.9; color: rgba(255, 255, 255, 0.72); }
.footer-links a { display: block; padding: 5px 0; font-size: 14.5px; color: rgba(255, 255, 255, 0.78); transition: color .2s; }
.footer-links a:hover { color: var(--accent); }
.footer-contact li { font-size: 14.5px; padding: 6px 0; color: rgba(255, 255, 255, 0.85); }
.footer-contact .val { color: #fff; font-weight: 600; }
.qr-row { display: flex; gap: 18px; margin-top: 16px; }
.qr-item { text-align: center; }
.qr-item img { width: 104px; height: 104px; object-fit: contain; background: #fff; border-radius: 10px; padding: 6px; }
.qr-item span { display: block; font-size: 12.5px; margin-top: 8px; color: rgba(255, 255, 255, 0.7); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14); padding: 18px 0;
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  font-size: 13px; color: rgba(255, 255, 255, 0.6);
}

/* ============ 内页 Hero ============ */
.page-hero {
  margin-top: var(--nav-h); padding: 84px 0 70px; text-align: center; color: #fff;
  background: linear-gradient(120deg, var(--primary-dark), var(--primary) 60%, #0072c6);
  position: relative; overflow: hidden;
}
.page-hero::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 300px; height: 300px;
  border-radius: 50%; background: rgba(255, 255, 255, 0.07);
}
.page-hero h1 { font-size: 40px; font-weight: 800; }
.page-hero p { margin: 14px auto 0; max-width: 720px; color: rgba(255, 255, 255, 0.9); font-size: 16px; }

/* ============ 服务页 ============ */
.svc-subnav {
  position: sticky; top: var(--nav-h); z-index: 90;
  background: #fff; border-bottom: 1px solid var(--border);
  display: flex; gap: 4px; overflow-x: auto; padding: 10px 0;
}
.svc-subnav a {
  flex: 0 0 auto; padding: 8px 18px; font-size: 14.5px; font-weight: 600;
  color: var(--text-light); border-radius: 999px; transition: all .2s;
}
.svc-subnav a:hover, .svc-subnav a.active { background: var(--primary); color: #fff; }
.svc-block { padding: 84px 0; border-bottom: 1px solid var(--border); scroll-margin-top: 150px; }
.svc-block:last-child { border-bottom: 0; }
.svc-block-inner { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; }
.svc-block:nth-child(even) .svc-block-inner { direction: rtl; }
.svc-block:nth-child(even) .svc-block-inner > * { direction: ltr; }
.svc-img { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.svc-img img { height: 360px; width: 100%; object-fit: cover; }
.svc-info h2 { font-size: 28px; color: var(--primary-dark); }
.svc-info .en { font-size: 14px; color: var(--accent); font-weight: 700; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 14px; }
.svc-info .desc { color: var(--text-light); margin: 14px 0 22px; }
.svc-items { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; }
.svc-items li { position: relative; padding-left: 22px; font-size: 14.5px; color: var(--text); }
.svc-items li::before {
  content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px;
  border-radius: 50%; background: var(--accent);
}

/* ============ 内页通用 ============ */
.page-section { padding: 72px 0; }
.page-section.alt { background: var(--bg-alt); }
.sec-head.left { text-align: left; margin: 0 0 36px; }
.sec-head.left .sec-line { margin: 14px 0 0; }

/* 关于我们 */
.about-layout { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.about-layout img { border-radius: var(--radius); box-shadow: var(--shadow); }
.profile-text p { margin-bottom: 16px; font-size: 15.5px; }
.timeline { position: relative; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: var(--border); }
.tl-item { position: relative; padding: 0 0 34px 22px; }
.tl-item::before {
  content: ""; position: absolute; left: -27px; top: 6px; width: 12px; height: 12px;
  border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px var(--primary-light);
}
.tl-year { font-size: 22px; font-weight: 800; color: var(--primary); }
.tl-text { color: var(--text-light); font-size: 15px; margin-top: 4px; }
.honor-list li, .strength-list li { padding: 8px 0 8px 26px; position: relative; font-size: 15px; }
.honor-list li::before, .strength-list li::before { content: "✔"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.strength-list { max-width: 900px; }
.video-wrap { max-width: 960px; margin: 0 auto; border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); background: #000; }
.video-wrap video { width: 100%; display: block; aspect-ratio: 16 / 9; }
.ports-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.ports-block { background: #fff; border: 1px solid var(--border); border-radius: 12px; padding: 20px 22px; }
.ports-block h4 { color: var(--primary-dark); margin-bottom: 8px; font-size: 15.5px; }
.ports-block p { font-size: 13.5px; color: var(--text-light); line-height: 1.8; }

/* 案例 */
.case-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 22px; }
.case-item { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 26px; box-shadow: var(--shadow-sm); }
.case-item .tag {
  display: inline-block; font-size: 12px; color: var(--accent-dark); background: var(--primary-light);
  padding: 3px 12px; border-radius: 999px; font-weight: 700; margin-bottom: 12px;
}
.case-item h3 { font-size: 18px; color: var(--primary-dark); }
.case-note { text-align: center; color: var(--text-light); margin-top: 36px; font-size: 14px; }
.section-link {
  display: inline-flex; align-items: center; gap: 6px; margin-top: 30px;
  color: var(--primary); font-weight: 700; font-size: 15px;
  border-bottom: 2px solid var(--accent); padding-bottom: 2px;
}
.section-link::after { content: "→"; transition: transform .2s; }
.section-link:hover::after { transform: translateX(4px); }
.drill-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.drill-card img { height: 220px; width: 100%; object-fit: cover; border-radius: 12px; }
.drill-card figcaption { text-align: center; font-size: 14px; color: var(--text-light); margin-top: 10px; }

/* 设备与资质 */
.eq-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.eq-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-sm); transition: transform .25s, box-shadow .25s; }
.eq-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.eq-card img { height: 160px; width: 100%; object-fit: cover; }
.eq-card figcaption { text-align: center; padding: 14px 10px; font-size: 15px; font-weight: 600; color: var(--primary-dark); }
.cert-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.cert-grid img {
  width: 100%; height: 420px; object-fit: contain; border-radius: 12px;
  box-shadow: var(--shadow-sm); background: #fff; padding: 12px;
}

/* 联系 */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.contact-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 26px; box-shadow: var(--shadow-sm); }
.contact-card h3 { color: var(--primary-dark); font-size: 17px; margin-bottom: 14px; }
.contact-card .big { font-size: 21px; font-weight: 800; color: var(--primary); word-break: break-all; }
.contact-card p { color: var(--text-light); margin-top: 6px; font-size: 14px; }
.contact-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 0; }
.contact-row .big { font-size: 18px; }
.copy-btn {
  flex: 0 0 auto; font-size: 12px; padding: 4px 12px; cursor: pointer;
  border: 1px solid var(--border); border-radius: 999px; background: #fff;
  color: var(--primary); transition: all .2s;
}
.copy-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.contact-detail { display: flex; gap: 56px; align-items: flex-start; }
.contact-text { flex: 1; min-width: 0; }
.contact-text h3 { font-size: 24px; color: var(--primary-dark); margin-bottom: 16px; }
.contact-text p { margin: 10px 0; font-size: 15px; }
.contact-text .contact-row { padding: 4px 0; }
.contact-img { flex: 0 0 400px; }
.contact-img img { width: 100%; border-radius: 14px; box-shadow: var(--shadow); }
.map-wrap { position: relative; width: 100%; max-width: 640px; margin: 0 auto; padding-top: 75%; border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); background: #eef2f5; }
.map-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.location-card {
  display: flex; gap: 32px; align-items: stretch;
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  padding: 28px; box-shadow: var(--shadow-sm);
}
.location-map { flex: 1.25; min-width: 0; border-radius: 12px; overflow: hidden; box-shadow: var(--shadow-sm); background: #eef2f5; }
.location-map iframe { width: 100%; height: 100%; min-height: 380px; border: 0; display: block; }
.location-info { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 10px; padding: 10px 6px; }
.location-info h3 { font-size: 22px; color: var(--primary-dark); }
.location-info p { font-size: 14.5px; color: var(--text-light); line-height: 1.8; }
.location-info .map-hint { margin-top: 8px; font-size: 13px; padding-top: 14px; border-top: 1px dashed var(--border); }
.qr-cards { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; padding: 8px 0; }
.qr-card {
  background: #fff; border: 1px solid var(--border); border-radius: 16px;
  padding: 26px 30px 22px; box-shadow: var(--shadow-sm); text-align: center;
  transition: transform .25s, box-shadow .25s;
}
.qr-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.qr-card img { width: 150px; height: 150px; object-fit: contain; background: #fff; }
.qr-card span { display: block; margin-top: 14px; color: var(--text); font-size: 15px; font-weight: 600; }
.qr-card small { display: block; margin-top: 4px; color: var(--text-light); font-size: 12.5px; }

/* ============ 滚动渐入 ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 992px) {
  .core-grid, .svc-grid, .case-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .svc-block-inner { grid-template-columns: 1fr; gap: 28px; }
  .svc-block:nth-child(even) .svc-block-inner { direction: ltr; }
  .about-layout, .contact-grid { grid-template-columns: 1fr; }
  .contact-detail { flex-direction: column; }
  .contact-img { flex: 1 1 auto; }
  .location-card { flex-direction: column; }
  .location-map iframe { min-height: 280px; }
  .eq-grid { grid-template-columns: 1fr 1fr; }
  .drill-grid { grid-template-columns: 1fr 1fr; }
  .ports-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
  .hero { height: 540px; }
  .hero-title { font-size: 32px; }
}
@media (max-width: 640px) {
  .main-nav {
    position: fixed; top: var(--nav-h); right: 0; bottom: 0; width: 260px;
    background: #fff; flex-direction: column; align-items: flex-start; padding: 24px;
    box-shadow: -6px 0 30px rgba(0, 0, 0, 0.12);
    transform: translateX(100%); transition: transform .3s;
  }
  .main-nav.open { transform: none; }
  .main-nav a { width: 100%; padding: 12px 10px; }
  .nav-toggle { display: block; }
  .core-grid, .svc-grid, .case-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .stat .num { font-size: 36px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .svc-items { grid-template-columns: 1fr; }
  .eq-grid, .drill-grid, .cert-grid, .case-list { grid-template-columns: 1fr; }
}