/* ============================================================
   星途云晖数智 · 官网样式（v2 视觉升级版）
   纯静态，无任何框架依赖，可直接部署到任意服务器
   ============================================================ */
:root {
  --navy-deep: #0b1f38;      /* 页脚 / 最深底色 */
  --navy: #123e63;           /* 标题深蓝 */
  --blue: #1b6bb0;           /* 主蓝 */
  --blue-mid: #1567a8;
  --blue-light: #eaf3fb;     /* 浅蓝区块底 */
  --blue-soft: #d7e9f7;
  --accent: #f28c1e;         /* 品牌橙 */
  --accent-light: #ffb54d;
  --accent-deep: #e07c0a;
  --text: #3a4a5c;
  --text-light: #6b7c8e;
  --white: #ffffff;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(13, 36, 64, 0.07);
  --shadow-hover: 0 18px 44px rgba(13, 36, 64, 0.16);
  --maxw: 1160px;
  --ease: cubic-bezier(0.22, 0.72, 0.28, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
::selection { background: rgba(242, 140, 30, 0.25); }

/* 细滚动条（桌面端） */
@media (min-width: 961px) {
  ::-webkit-scrollbar { width: 10px; }
  ::-webkit-scrollbar-track { background: #eef4fa; }
  ::-webkit-scrollbar-thumb { background: #b8cbdd; border-radius: 6px; border: 2px solid #eef4fa; }
  ::-webkit-scrollbar-thumb:hover { background: #93aec7; }
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ============ 顶部导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: box-shadow 0.3s;
}
.site-header.scrolled {
  box-shadow: 0 4px 24px rgba(13, 36, 64, 0.1);
}
.header-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 70px; display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 9px; overflow: hidden;
  box-shadow: 0 3px 10px rgba(13, 36, 64, 0.18);
}
.brand-name { font-size: 19px; font-weight: 700; color: var(--navy); letter-spacing: 1px; }
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  padding: 8px 13px; font-size: 15px; color: var(--text);
  border-radius: 8px; transition: color 0.2s, background 0.2s;
}
.main-nav a:hover { color: var(--blue); background: var(--blue-light); }
.main-nav a.active {
  color: var(--blue); font-weight: 600;
  box-shadow: inset 0 -2px 0 var(--blue);
}
.btn-nav-cta {
  margin-left: 14px;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  color: #fff !important;
  padding: 10px 22px !important; border-radius: 9px !important;
  font-weight: 600;
  box-shadow: 0 5px 16px rgba(242, 140, 30, 0.38);
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(242, 140, 30, 0.45);
}
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--navy); margin: 5px 0; border-radius: 2px; transition: 0.25s; }

/* ============ 内页页头横幅 ============ */
.page-hero {
  position: relative; color: #fff; text-align: center;
  padding: 100px 24px 110px; overflow: hidden;
  background:
    radial-gradient(900px 380px at 88% -30%, rgba(64, 156, 255, 0.35), transparent 60%),
    radial-gradient(700px 300px at 5% 130%, rgba(242, 140, 30, 0.18), transparent 60%),
    linear-gradient(130deg, #081f38 0%, #123e63 45%, #1b6bb0 100%);
}
.page-hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.page-hero h1 { font-size: 40px; font-weight: 800; letter-spacing: 3px; margin-bottom: 14px; text-shadow: 0 4px 24px rgba(8, 31, 56, 0.45); position: relative; }
.page-hero p { font-size: 16px; opacity: 0.88; letter-spacing: 1px; position: relative; }

/* ============ 首页 Hero ============ */
.hero {
  position: relative; color: #fff; text-align: center;
  padding: 140px 24px 160px; overflow: hidden;
  background: linear-gradient(135deg, #081f38 0%, #0d3a63 52%, #1b6bb0 100%);
}
/* 网格纹理 */
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 40%, #000 20%, transparent 72%);
  mask-image: radial-gradient(ellipse at 50% 40%, #000 20%, transparent 72%);
}
/* 漂浮光斑 */
.hero .orb { position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.5; pointer-events: none; animation: floaty 9s ease-in-out infinite alternate; }
.hero .orb.o1 { width: 420px; height: 420px; background: #2e8ce0; top: -140px; right: -80px; }
.hero .orb.o2 { width: 340px; height: 340px; background: rgba(242, 140, 30, 0.55); bottom: -160px; left: -90px; animation-delay: -4s; }
@keyframes floaty { from { transform: translate(0, 0) scale(1); } to { transform: translate(30px, -24px) scale(1.12); } }
/* 斜切光带 */
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(115deg, transparent 55%, rgba(255,255,255,0.06) 55.2%, rgba(255,255,255,0.06) 70%, transparent 70.2%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  background: rgba(255, 255, 255, 0.1); color: #ffd9a3;
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 8px 20px; border-radius: 999px;
  font-size: 13.5px; letter-spacing: 2px; margin-bottom: 26px;
  backdrop-filter: blur(4px);
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(242, 140, 30, 0.25); }
.hero h1 { font-size: 44px; font-weight: 800; line-height: 1.4; letter-spacing: 2px; text-shadow: 0 6px 30px rgba(8, 31, 56, 0.5); animation: fadeUp 0.9s var(--ease) both; position: relative; }
.hero h1 .plus { color: var(--accent-light); }
.hero p.sub { margin-top: 18px; font-size: 17px; opacity: 0.88; letter-spacing: 1px; animation: fadeUp 0.9s 0.12s var(--ease) both; position: relative; }
.hero-actions { margin-top: 40px; display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; animation: fadeUp 0.9s 0.24s var(--ease) both; position: relative; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: none; } }

/* ============ 通用按钮 ============ */
.btn {
  display: inline-block; padding: 13px 36px; border-radius: 10px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: none;
  transition: transform 0.22s var(--ease), box-shadow 0.22s, background 0.22s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent) 60%, var(--accent-deep) 100%);
  color: #fff;
  box-shadow: 0 8px 22px rgba(242, 140, 30, 0.42);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 32px rgba(242, 140, 30, 0.5); }
.btn-outline { background: rgba(255,255,255,0.06); color: #fff; border: 1.5px solid rgba(255,255,255,0.65); backdrop-filter: blur(3px); }
.btn-outline:hover { background: rgba(255,255,255,0.14); transform: translateY(-3px); }
.btn-outline-dark { background: transparent; color: var(--blue); border: 1.5px solid var(--blue); }
.btn-outline-dark:hover { background: var(--blue-light); transform: translateY(-3px); }

/* ============ 区块通用 ============ */
.section { padding: 92px 0; }
.section.alt { background: linear-gradient(180deg, #f2f7fc, #eaf3fb); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head h2 {
  font-size: 31px; color: var(--navy); font-weight: 800; letter-spacing: 3px;
  position: relative; display: inline-block; padding: 0 54px;
}
.section-head h2::before, .section-head h2::after {
  content: ""; position: absolute; top: 50%; width: 36px; height: 2px;
  background: linear-gradient(90deg, transparent, #c3d6e8);
}
.section-head h2::before { left: 0; }
.section-head h2::after { right: 0; transform: scaleX(-1); }
.section-head .line {
  width: 64px; height: 4px; border-radius: 3px; margin: 16px auto 14px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
}
.section-head p { color: var(--text-light); font-size: 15px; letter-spacing: 0.5px; }

/* ============ 滚动渐入动画 ============ */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero .orb, .hero h1, .hero p.sub, .hero-actions, .map-placeholder .pin { animation: none; }
}

/* ============ 核心服务卡片 ============ */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.service-card {
  position: relative; overflow: hidden;
  background: #fff; border-radius: var(--radius); padding: 36px 30px 30px;
  box-shadow: var(--shadow); border: 1px solid #ecf2f8;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
  display: flex; flex-direction: column;
}
/* 悬浮时顶部亮条 */
.service-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
  transform: scaleX(0); transform-origin: left; transition: transform 0.35s var(--ease);
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(135deg, #eaf3fb, #d7e9f7);
  color: var(--blue); font-size: 26px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 22px; transition: transform 0.3s var(--ease);
}
.service-card:hover .service-icon { transform: scale(1.08) rotate(-3deg); }
.service-card h3 { font-size: 18px; color: var(--navy); margin-bottom: 10px; }
.service-card p { font-size: 14px; color: var(--text-light); flex: 1; }
.service-card .more {
  margin-top: 18px; font-size: 14px; color: var(--accent); font-weight: 600;
  display: inline-flex; align-items: center; gap: 4px;
  transition: gap 0.2s, color 0.2s;
}
.service-card .more:hover { color: var(--accent-deep); gap: 8px; }

/* ============ 星途研数通板块 ============ */
.yht-section {
  background:
    radial-gradient(800px 340px at 8% 0%, rgba(27, 107, 176, 0.1), transparent 60%),
    linear-gradient(180deg, #f2f7fc, #eaf3fb);
}
.yht-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 56px; align-items: center; }
.yht-tag {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--navy); color: #fff; padding: 6px 18px;
  border-radius: 999px; font-size: 13px; letter-spacing: 2px; margin-bottom: 18px;
  box-shadow: 0 4px 14px rgba(13, 36, 64, 0.22);
}
.yht-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(242, 140, 30, 0.22); }
.yht-grid h2 { font-size: 28px; color: var(--navy); margin-bottom: 18px; letter-spacing: 1px; }
.yht-grid > div > p { color: var(--text-light); font-size: 15px; margin-bottom: 22px; }
.yht-list li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 15px; margin-bottom: 13px; color: var(--text);
  background: rgba(255,255,255,0.7); border: 1px solid #e3edf6;
  border-radius: 10px; padding: 10px 14px;
  transition: transform 0.25s var(--ease), border-color 0.25s;
}
.yht-list li:hover { transform: translateX(6px); border-color: var(--blue-soft); }
.yht-list .check {
  color: #fff; font-weight: 700; flex: none;
  width: 20px; height: 20px; border-radius: 50%; margin-top: 3px;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  display: inline-flex; align-items: center; justify-content: center; font-size: 12px;
}
.yht-grid .btn { margin-top: 26px; }
.qr-card {
  position: relative;
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-hover);
  padding: 36px; text-align: center; max-width: 330px; margin: 0 auto;
  border: 1px solid #ecf2f8;
}
.qr-card::before {
  content: ""; position: absolute; inset: -10px; border-radius: 20px;
  background: linear-gradient(135deg, rgba(27,107,176,0.14), rgba(242,140,30,0.14));
  z-index: -1; filter: blur(2px);
}
.qr-box {
  width: 190px; height: 190px; margin: 0 auto 18px;
  border: 1px dashed #c4d6e8; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: #9ab2c9; font-size: 13px; background: #f6fafd;
}
.qr-card h4 { color: var(--navy); font-size: 16px; }
.qr-card p { font-size: 13px; color: var(--text-light); margin-top: 6px; }

/* ============ 优势 ============ */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 30px; }
.adv-item { text-align: center; }
.adv-icon {
  width: 76px; height: 76px; margin: 0 auto 22px; border-radius: 22px;
  background: linear-gradient(135deg, #1b6bb0, #0d2440);
  color: #fff; font-size: 29px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 12px 26px rgba(18, 62, 99, 0.32);
  transition: transform 0.3s var(--ease);
  position: relative;
}
.adv-icon::after {
  content: ""; position: absolute; inset: 5px; border-radius: 17px;
  border: 1.5px dashed rgba(255, 255, 255, 0.35);
}
.adv-item:hover .adv-icon { transform: translateY(-6px) rotate(3deg); }
.adv-item h3 { font-size: 17px; color: var(--navy); margin-bottom: 10px; }
.adv-item p { font-size: 13.5px; color: var(--text-light); }

/* ============ CTA ============ */
.cta {
  position: relative; overflow: hidden;
  background: linear-gradient(120deg, #081f38, #123e63 55%, #1b6bb0);
  color: #fff; text-align: center; padding: 96px 24px;
}
.cta::before {
  content: ""; position: absolute; width: 460px; height: 460px; border-radius: 50%;
  background: rgba(46, 140, 224, 0.35); filter: blur(90px); top: -220px; right: -120px;
}
.cta::after {
  content: ""; position: absolute; width: 320px; height: 320px; border-radius: 50%;
  background: rgba(242, 140, 30, 0.25); filter: blur(80px); bottom: -160px; left: -80px;
}
.cta h2 { font-size: 30px; font-weight: 800; letter-spacing: 3px; position: relative; }
.cta p { margin: 14px 0 36px; opacity: 0.88; position: relative; }
.cta .btn { position: relative; }

/* ============ 服务详情页 ============ */
.service-block {
  position: relative; overflow: hidden;
  display: grid; grid-template-columns: 64px 1fr; gap: 24px;
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 42px 46px; margin-bottom: 34px; border: 1px solid #ecf2f8;
  transition: box-shadow 0.3s;
}
.service-block:hover { box-shadow: var(--shadow-hover); }
.service-block::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(180deg, var(--blue), var(--accent));
  opacity: 0; transition: opacity 0.3s;
}
.service-block:hover::before { opacity: 1; }
.service-block .service-icon { width: 64px; height: 64px; font-size: 28px; margin: 0; }
.service-block h2 { font-size: 22px; color: var(--navy); margin-bottom: 8px; }
.service-block .desc { font-size: 14.5px; color: var(--text-light); margin-bottom: 18px; }
.svc-detail h4 {
  font-size: 14px; color: var(--blue); letter-spacing: 2px;
  margin: 18px 0 10px; font-weight: 700;
  display: flex; align-items: center; gap: 10px;
}
.svc-detail h4::after { content: ""; flex: 1; height: 1px; background: #e3edf6; }
.svc-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 32px; }
.svc-cols li { display: flex; gap: 8px; font-size: 14.5px; align-items: flex-start; }
.svc-cols .check { color: var(--accent); font-weight: 700; flex: none; margin-top: 1px; }
.svc-note {
  margin-top: 16px; background: var(--blue-light); border-left: 4px solid var(--blue);
  padding: 12px 16px; border-radius: 0 8px 8px 0; font-size: 13.5px; color: var(--text);
}
.svc-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; }
.svc-tags span {
  background: linear-gradient(135deg, #123e63, #1b6bb0); color: #fff; font-size: 12.5px;
  padding: 5px 14px; border-radius: 999px;
}
.service-block .btn { margin-top: 22px; padding: 10px 28px; font-size: 14px; }

/* ============ 关于页 ============ */
.prose { max-width: 880px; margin: 0 auto; }
.prose p { margin-bottom: 18px; font-size: 15.5px; }
.concept-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.concept-card {
  background: #fff; border-radius: var(--radius); text-align: center;
  padding: 40px 24px; box-shadow: var(--shadow); border: 1px solid #ecf2f8;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.concept-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.concept-icon {
  width: 60px; height: 60px; margin: 0 auto 18px; border-radius: 50%;
  background: linear-gradient(135deg, #1b6bb0, #0d2440); color: #fff; font-size: 25px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 20px rgba(13, 36, 64, 0.25);
}
.concept-card h3 { color: var(--navy); font-size: 17px; margin-bottom: 10px; }
.concept-card p { font-size: 13.5px; color: var(--text-light); }
.team-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.team-card {
  background: #fff; border-radius: var(--radius); text-align: center;
  padding: 42px 30px; box-shadow: var(--shadow);
  border: 1px solid #ecf2f8; border-top: 4px solid transparent;
  transition: transform 0.3s var(--ease), box-shadow 0.3s, border-top-color 0.3s;
}
.team-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-top-color: var(--accent); }
.team-icon {
  width: 66px; height: 66px; margin: 0 auto 18px; border-radius: 50%;
  background: linear-gradient(135deg, #eaf3fb, #d7e9f7); color: var(--blue); font-size: 27px;
  display: flex; align-items: center; justify-content: center;
}
.team-card h3 { color: var(--navy); font-size: 17px; }
.team-card .tag { display: block; font-size: 12.5px; color: var(--accent); margin: 6px 0 12px; font-weight: 600; }
.team-card p { font-size: 13.5px; color: var(--text-light); }

/* ============ 案例页 ============ */
.filter-bar { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 38px; }
.filter-bar button {
  padding: 8px 22px; border-radius: 999px; border: 1px solid var(--blue-soft);
  background: #fff; color: var(--blue); font-size: 14px; cursor: pointer;
  transition: all 0.22s;
}
.filter-bar button:hover { border-color: var(--blue); background: var(--blue-light); }
.filter-bar button.active {
  background: linear-gradient(135deg, #123e63, #1b6bb0); color: #fff; border-color: transparent;
  box-shadow: 0 5px 14px rgba(18, 62, 99, 0.28);
}
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card {
  background: #fff; border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); border: 1px solid #ecf2f8;
  transition: transform 0.3s var(--ease), box-shadow 0.3s;
}
.case-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.case-cover {
  height: 150px; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 40px; overflow: hidden;
  background: linear-gradient(135deg, #1b6bb0, #0d2440);
}
.case-cover span { transition: transform 0.4s var(--ease); }
.case-card:hover .case-cover span { transform: scale(1.12); }
.case-body { padding: 24px; }
.case-body .cat {
  display: inline-block; font-size: 12px; color: var(--blue);
  background: var(--blue-light); padding: 3px 12px; border-radius: 999px; margin-bottom: 10px;
}
.case-body h3 { font-size: 16.5px; color: var(--navy); margin-bottom: 8px; }
.case-body .cat + .cat { margin-left: 6px; }
.case-body p { font-size: 13.5px; color: var(--text-light); }
.empty-tip {
  grid-column: 1 / -1; text-align: center; padding: 54px 20px;
  color: var(--text-light); background: rgba(255,255,255,0.7); border-radius: var(--radius);
  border: 1px dashed #c4d6e8; font-size: 14px;
}
.news-list li {
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  background: #fff; border-radius: 12px; padding: 20px 26px; margin-bottom: 14px;
  box-shadow: var(--shadow); border: 1px solid #ecf2f8;
  transition: transform 0.22s var(--ease), box-shadow 0.22s;
}
.news-list li:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.news-list h3 { font-size: 15.5px; color: var(--navy); font-weight: 600; transition: color 0.2s; }
.news-list li:hover h3 { color: var(--blue); }
.news-list time { font-size: 13px; color: var(--text-light); white-space: nowrap; }
.news-list li > a { display: flex; justify-content: space-between; align-items: center; gap: 20px; width: 100%; }

/* ============ 联系页 ============ */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; }
.contact-item {
  display: flex; gap: 18px; margin-bottom: 26px;
  background: #fff; border: 1px solid #ecf2f8; border-radius: 12px;
  padding: 20px 24px; box-shadow: var(--shadow);
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
}
.contact-item:hover { transform: translateX(6px); box-shadow: var(--shadow-hover); }
.contact-icon {
  width: 50px; height: 50px; flex: none; border-radius: 13px;
  background: linear-gradient(135deg, #eaf3fb, #d7e9f7); color: var(--blue); font-size: 20px;
  display: flex; align-items: center; justify-content: center;
}
.contact-item h3 { font-size: 16px; color: var(--navy); margin-bottom: 4px; }
.contact-item p { font-size: 14px; color: var(--text-light); }
.contact-item a { color: var(--blue); font-weight: 600; }
.contact-form {
  position: relative;
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow-hover);
  padding: 40px; border: 1px solid #ecf2f8; overflow: hidden;
}
.contact-form::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--accent));
}
.contact-form h2 { font-size: 20px; color: var(--navy); margin-bottom: 6px; }
.contact-form > p { font-size: 13.5px; color: var(--text-light); margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--navy); margin-bottom: 8px; font-weight: 600; }
.form-group input, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid #d6e2ee; border-radius: 9px;
  font-size: 14px; font-family: inherit; color: var(--text); background: #fbfdff;
  transition: border 0.2s, box-shadow 0.2s, background 0.2s;
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--blue); background: #fff;
  box-shadow: 0 0 0 4px rgba(27, 107, 176, 0.11);
}
.form-group textarea { min-height: 130px; resize: vertical; }
.contact-form .btn { width: 100%; }
.form-msg { margin-top: 14px; font-size: 14px; text-align: center; display: none; }
.form-msg.ok { display: block; color: #1a8f4d; }
.form-msg.err { display: block; color: #d2413a; }
.map-placeholder {
  margin-top: 70px; background: linear-gradient(180deg, #f2f7fc, #eaf3fb); border-radius: var(--radius);
  height: 300px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  color: #7d9cbc; gap: 8px; border: 1px dashed #c4d6e8;
}
.map-placeholder .pin { font-size: 40px; animation: bouncePin 2.4s ease-in-out infinite; }
@keyframes bouncePin { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-9px); } }
.map-placeholder p { font-size: 13px; }

/* ============ 文章详情页 ============ */
.article { max-width: 820px; margin: 0 auto; }
.article h1 { font-size: 30px; color: var(--navy); line-height: 1.5; margin-bottom: 14px; letter-spacing: 1px; }
.article .meta { font-size: 13.5px; color: var(--text-light); padding-bottom: 22px; border-bottom: 1px solid #e8eef5; margin-bottom: 30px; }
.article h3 { font-size: 19px; color: var(--navy); margin: 32px 0 12px; padding-left: 12px; border-left: 4px solid var(--accent); }
.article p { margin-bottom: 16px; font-size: 15.5px; }
.article ul.bullet { margin: 0 0 18px 0; }
.article ul.bullet li { position: relative; padding-left: 18px; margin-bottom: 10px; font-size: 15.5px; }
.article ul.bullet li::before { content: "•"; color: var(--accent); position: absolute; left: 2px; }
.article .callout { background: var(--blue-light); border-left: 4px solid var(--blue); padding: 16px 20px; border-radius: 0 8px 8px 0; margin: 20px 0; font-size: 14.5px; }
.article .back { display: inline-block; margin-top: 36px; font-size: 14px; color: var(--blue); }

/* ============ 页脚 ============ */
.site-footer {
  position: relative;
  background:
    radial-gradient(700px 260px at 90% 0%, rgba(27, 107, 176, 0.22), transparent 60%),
    var(--navy-deep);
  color: #b9c7d6; padding: 68px 0 0; font-size: 14px;
}
.site-footer::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--accent), var(--blue));
}
.footer-grid {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px 46px;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px;
}
.footer-brand .brand { margin-bottom: 16px; }
.footer-brand .brand-name { color: #fff; }
.footer-brand p { font-size: 13px; line-height: 1.8; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 18px; letter-spacing: 2px; }
.site-footer li { margin-bottom: 10px; transition: transform 0.2s; }
.site-footer li:hover { transform: translateX(4px); }
.site-footer a:hover { color: var(--accent-light); }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; }
.footer-contact li:hover { transform: none; }
.footer-contact .ico {
  flex: none; width: 26px; height: 26px; border-radius: 8px; margin-top: 2px;
  background: rgba(242, 140, 30, 0.16); color: var(--accent-light);
  display: inline-flex; align-items: center; justify-content: center; font-size: 13px;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center; padding: 20px 24px; font-size: 13px; color: #7f93a8;
}

/* ============ 返回顶部 ============ */
.back-top {
  position: fixed; right: 26px; bottom: 26px; width: 46px; height: 46px;
  border-radius: 13px; color: #fff; border: none;
  font-size: 18px; cursor: pointer;
  background: linear-gradient(135deg, var(--accent-light), var(--accent));
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: 0.3s; box-shadow: 0 10px 24px rgba(242, 140, 30, 0.4); z-index: 90;
}
.back-top.show { opacity: 0.95; pointer-events: auto; transform: none; }
.back-top:hover { transform: translateY(-4px); }

/* ============ 响应式 ============ */
@media (max-width: 960px) {
  .services-grid, .concept-grid, .team-grid, .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); gap: 40px 24px; }
  .yht-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 33px; }
  .page-hero h1 { font-size: 31px; }
  .section-head h2 { padding: 0 20px; font-size: 27px; }
  .service-block { grid-template-columns: 1fr; padding: 30px 26px; }
}
@media (max-width: 640px) {
  .services-grid, .concept-grid, .team-grid, .cases-grid, .adv-grid, .footer-grid { grid-template-columns: 1fr; }
  .svc-cols { grid-template-columns: 1fr; }
  .main-nav {
    position: absolute; top: 70px; left: 0; right: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 12px 20px 20px; gap: 2px;
    box-shadow: 0 16px 32px rgba(13, 36, 64, 0.14);
    display: none;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 10px; }
  .main-nav a.active { box-shadow: inset 2px 0 0 var(--blue); background: var(--blue-light); }
  .btn-nav-cta { margin: 10px 0 0; text-align: center; }
  .nav-toggle { display: block; }
  .hero { padding: 100px 20px 120px; }
  .hero h1 { font-size: 27px; }
  .hero-badge { font-size: 12px; padding: 6px 14px; }
  .section { padding: 64px 0; }
  .contact-form { padding: 28px 22px; }
}