/* ============================================================
   北京远望地热技术 企业官网
   style.css — 全站样式
   ============================================================ */
:root {
  --primary: #0f3b66;
  --primary-dark: #0a2743;
  --primary-light: #1c5a94;
  --accent: #d92b2b;
  --gold: #e8a33d;
  --text: #333a45;
  --text-light: #6b7686;
  --bg-light: #f5f7fa;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 10px 40px rgba(15, 59, 102, 0.10);
  --shadow-hover: 0 20px 60px rgba(15, 59, 102, 0.18);
  --transition: all 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
  --header-h: 76px;
}

* { 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: 1.7;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }

.container { width: min(1200px, 92%); margin: 0 auto; }

/* ============ 页面加载动画 ============ */
#page-loader {
  position: fixed; inset: 0; z-index: 9999;
  background: var(--primary-dark);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 18px;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
#page-loader.hide { opacity: 0; visibility: hidden; }
.loader-logo {
  height: 52px; width: auto; max-width: 220px; object-fit: contain; border-radius: 8px;
  animation: loaderPulse 1.2s ease-in-out infinite;
}
.loader-text { color: rgba(255,255,255,0.85); letter-spacing: 6px; font-size: 14px; }
.loader-bar { width: 160px; height: 3px; background: rgba(255,255,255,0.15); border-radius: 2px; overflow: hidden; }
.loader-bar::after {
  content: ""; display: block; height: 100%; width: 40%;
  background: var(--gold); border-radius: 2px;
  animation: loaderSlide 1.1s ease-in-out infinite;
}
@keyframes loaderPulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.08); } }
@keyframes loaderSlide { 0% { transform: translateX(-120%); } 100% { transform: translateX(320%); } }

/* ============ 顶部导航 ============ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 2px 20px rgba(10, 39, 67, 0.08);
}
/* 移动端菜单展开时，头部强制白底，避免透明头部与菜单同色导致内容不可见 */
.site-header.nav-open {
  background: #fff;
  box-shadow: 0 2px 20px rgba(10, 39, 67, 0.12);
}
.site-header.nav-open .brand-name { color: var(--primary); }
.site-header.nav-open .brand-name span { color: var(--text-light); }
.site-header.nav-open .nav-toggle span { background: var(--primary); }
.site-header.scrolled { box-shadow: 0 4px 24px rgba(10, 39, 67, 0.14); }
.site-header.transparent {
  background: transparent;
  box-shadow: none;
}
.header-inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 12px; }
/* LOGO 原图 300×80（宽高比 3.75:1）：按高度定尺寸、宽度自适应，禁止拉伸变形 */
.brand img { height: 38px; width: auto; max-width: 190px; object-fit: contain; border-radius: 4px; }
img.brand-logo { display: block; flex: none; }
.brand-name { font-size: 20px; font-weight: 700; color: var(--primary); letter-spacing: 1px; line-height: 1.2; }
.brand-name span { display: block; font-size: 11px; font-weight: 400; color: var(--text-light); letter-spacing: 2px; }
.site-header.transparent .brand-name { color: #fff; }
.site-header.transparent .brand-name span { color: rgba(255,255,255,0.75); }

.main-nav > ul { display: flex; gap: 6px; }
.main-nav a.nav-link {
  display: block; padding: 10px 18px; font-size: 16px; font-weight: 500;
  color: var(--primary); position: relative; cursor: pointer;
}
.main-nav a.nav-link::after {
  content: ""; position: absolute; left: 18px; right: 18px; bottom: 4px;
  height: 2px; background: var(--accent); transform: scaleX(0);
  transform-origin: center; transition: transform 0.3s ease;
}
.main-nav a.nav-link:hover::after,
.main-nav a.nav-link.active::after { transform: scaleX(1); }
.site-header.transparent a.nav-link { color: rgba(255,255,255,0.92); }

/* 下拉菜单 */
.has-dropdown { position: relative; }
.dropdown {
  position: absolute; top: calc(100% + 14px); left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--white); border-radius: var(--radius);
  box-shadow: var(--shadow-hover); padding: 8px 0;
  min-width: 168px; opacity: 0; visibility: hidden;
  transition: var(--transition);
}
.dropdown::before {
  content: ""; position: absolute; top: -14px; left: 0; right: 0; height: 14px;
}
.has-dropdown:hover .dropdown,
.has-dropdown.open .dropdown {
  opacity: 1; visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown a {
  display: block; padding: 10px 22px; font-size: 15px;
  color: var(--text); white-space: nowrap;
}
.dropdown a:hover { background: var(--bg-light); color: var(--accent); padding-left: 28px; }

.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 8px; position: relative; z-index: 1300; width: 44px; height: 44px;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px; background: var(--primary);
  margin: 5px auto; transition: var(--transition); border-radius: 2px;
}
.site-header.transparent .nav-toggle span { background: #fff; }
/* 展开态：三条线变叉号 */
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端菜单遮罩 */
.nav-mask {
  position: fixed; inset: 0; z-index: 1100;
  background: rgba(10, 39, 67, 0.45);
  opacity: 0; visibility: hidden; transition: var(--transition);
}
.nav-mask.show { opacity: 1; visibility: visible; }

/* ============ 首页轮播 ============ */
.hero {
  position: relative; height: 100vh; min-height: 640px;
  overflow: hidden; background: var(--primary-dark);
}
.hero-slide {
  position: absolute; inset: 0; opacity: 0;
  transition: opacity 1.2s ease; pointer-events: none;
}
.hero-slide.active { opacity: 1; pointer-events: auto; }
.hero-slide .bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  animation: kenburns 14s ease-out forwards;
}
@keyframes kenburns {
  from { transform: scale(1.12); }
  to { transform: scale(1); }
}
.hero-slide::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(10,39,67,0.55) 0%, rgba(10,39,67,0.25) 45%, rgba(10,39,67,0.75) 100%);
}
.hero-content {
  position: relative; z-index: 2; height: 100%;
  display: flex; flex-direction: column; justify-content: center; align-items: center;
  text-align: center; color: #fff; padding: 0 20px;
}
.hero-tag {
  font-size: 15px; letter-spacing: 8px; color: var(--gold);
  margin-bottom: 22px; text-transform: uppercase;
  opacity: 0; transform: translateY(24px);
  animation: fadeUp 0.9s ease 0.3s forwards;
}
.hero-title {
  font-size: clamp(34px, 5.4vw, 64px); font-weight: 700; letter-spacing: 4px;
  text-shadow: 0 4px 30px rgba(0,0,0,0.35);
  opacity: 0; transform: translateY(30px);
  animation: fadeUp 0.9s ease 0.55s forwards;
}
.hero-sub {
  margin-top: 18px; font-size: clamp(15px, 1.6vw, 20px); letter-spacing: 3px;
  color: rgba(255,255,255,0.88); max-width: 780px;
  opacity: 0; transform: translateY(30px);
  animation: fadeUp 0.9s ease 0.8s forwards;
}
.hero-btns {
  margin-top: 40px; display: flex; gap: 18px; flex-wrap: wrap; justify-content: center;
  opacity: 0; transform: translateY(30px);
  animation: fadeUp 0.9s ease 1.05s forwards;
}
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 34px; border-radius: 40px; font-size: 16px; font-weight: 500;
  transition: var(--transition); border: none; cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 24px rgba(217,43,43,0.35); }
.btn-primary:hover { background: #b71f1f; transform: translateY(-3px); box-shadow: 0 14px 32px rgba(217,43,43,0.45); }
.btn-ghost { background: rgba(255,255,255,0.12); color: #fff; border: 1px solid rgba(255,255,255,0.6); backdrop-filter: blur(4px); }
.btn-ghost:hover { background: rgba(255,255,255,0.25); transform: translateY(-3px); }
.btn-outline { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }

.hero-dots {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  display: flex; gap: 12px; z-index: 3;
}
.hero-dots button {
  width: 34px; height: 4px; border-radius: 2px; border: none; cursor: pointer;
  background: rgba(255,255,255,0.35); transition: var(--transition);
}
.hero-dots button.active { background: var(--gold); width: 52px; }
.hero-scroll {
  position: absolute; bottom: 30px; right: 44px; z-index: 3;
  color: rgba(255,255,255,0.75); font-size: 12px; letter-spacing: 3px;
  writing-mode: vertical-rl; display: flex; align-items: center; gap: 8px;
}
.hero-scroll::after {
  content: ""; width: 1px; height: 44px; background: rgba(255,255,255,0.5);
  animation: scrollHint 1.8s ease-in-out infinite;
}
@keyframes scrollHint { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 56% { transform-origin: bottom; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ============ 通用版块 ============ */
.section { padding: 96px 0; }
.section.gray { background: var(--bg-light); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .en {
  font-size: 13px; letter-spacing: 5px; color: var(--accent);
  text-transform: uppercase; font-weight: 600; margin-bottom: 10px;
}
.section-head h2 {
  font-size: clamp(26px, 3.2vw, 38px); color: var(--primary); font-weight: 700; letter-spacing: 2px;
}
.section-head .line {
  width: 56px; height: 3px; background: linear-gradient(90deg, var(--accent), var(--gold));
  margin: 18px auto 0; border-radius: 2px;
}
.section-head p.desc { margin-top: 16px; color: var(--text-light); max-width: 760px; margin-left: auto; margin-right: auto; }

/* ============ 首页-数据 ============ */
.stats-band {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #14508a 100%);
  padding: 64px 0; position: relative; overflow: hidden;
}
.stats-band::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 85% 20%, rgba(232,163,61,0.16), transparent 45%),
              radial-gradient(circle at 10% 85%, rgba(28,90,148,0.5), transparent 50%);
}
.stats-grid {
  position: relative; display: grid;
  grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center;
}
.stat-item .num {
  font-size: clamp(36px, 4.5vw, 54px); font-weight: 700; color: #fff;
  font-family: Georgia, "Times New Roman", serif;
}
.stat-item .num em { font-style: normal; color: var(--gold); font-size: 0.55em; margin-left: 4px; }
.stat-item .label { margin-top: 6px; color: rgba(255,255,255,0.75); font-size: 15px; letter-spacing: 2px; }

/* ============ 首页-简介 ============ */
.about-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 60px; align-items: center; }
.about-media { position: relative; }
.about-media .main-img { border-radius: var(--radius); box-shadow: var(--shadow-hover); width: 100%; object-fit: cover; aspect-ratio: 4/3; }
.about-media .sub-img {
  position: absolute; right: -26px; bottom: -34px; width: 46%;
  border-radius: var(--radius); box-shadow: var(--shadow-hover);
  border: 6px solid #fff; object-fit: cover; aspect-ratio: 4/3;
}
.about-media .exp-badge {
  position: absolute; left: -22px; top: -22px;
  background: var(--accent); color: #fff; border-radius: 14px;
  padding: 16px 20px; text-align: center; box-shadow: 0 12px 30px rgba(217,43,43,0.4);
}
.about-media .exp-badge b { display: block; font-size: 30px; line-height: 1.1; }
.about-media .exp-badge span { font-size: 12px; letter-spacing: 2px; }
.about-copy h2 { font-size: clamp(24px, 3vw, 34px); color: var(--primary); margin-bottom: 8px; }
.about-copy .en-sub { color: var(--text-light); letter-spacing: 3px; font-size: 13px; margin-bottom: 22px; }
.about-copy p { color: var(--text-light); margin-bottom: 14px; text-align: justify; }
.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; margin: 22px 0 30px; }
.about-points li { display: flex; align-items: center; gap: 10px; font-size: 15px; color: var(--text); }
.about-points li::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--gold)); flex-shrink: 0;
}

/* ============ 首页-核心技术卡片 ============ */
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.tech-card {
  background: var(--white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition);
  display: flex; flex-direction: column;
}
.tech-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-hover); }
.tech-card .thumb { position: relative; overflow: hidden; aspect-ratio: 16/10; background: #eef2f6; }
.tech-card .thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.tech-card:hover .thumb img { transform: scale(1.07); }
.tech-card .thumb .idx {
  position: absolute; top: 14px; left: 14px; z-index: 2;
  background: rgba(15,59,102,0.85); color: #fff; backdrop-filter: blur(4px);
  font-size: 13px; padding: 4px 12px; border-radius: 20px; letter-spacing: 1px;
}
.tech-card .body { padding: 24px 24px 26px; flex: 1; display: flex; flex-direction: column; }
.tech-card h3 { font-size: 19px; color: var(--primary); margin-bottom: 10px; }
.tech-card p { color: var(--text-light); font-size: 14.5px; flex: 1; }
.tech-card .more {
  margin-top: 16px; font-size: 14px; color: var(--accent); font-weight: 500;
  display: inline-flex; align-items: center; gap: 6px;
}
.tech-card .more::after { content: "→"; transition: transform 0.3s; }
.tech-card:hover .more::after { transform: translateX(5px); }

/* ============ 首页-案例 ============ */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.case-card {
  position: relative; border-radius: var(--radius); overflow: hidden;
  aspect-ratio: 4/3; box-shadow: var(--shadow);
}
.case-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.7s ease; }
.case-card:hover img { transform: scale(1.09); }
.case-card .overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(10,39,67,0.88) 100%);
  display: flex; flex-direction: column; justify-content: flex-end; padding: 24px;
  color: #fff;
}
.case-card .cat {
  font-size: 12px; letter-spacing: 2px; color: var(--gold); margin-bottom: 6px;
}
.case-card h3 { font-size: 18px; line-height: 1.45; }
.case-card .desc {
  max-height: 0; overflow: hidden; opacity: 0; transition: var(--transition);
  font-size: 13.5px; color: rgba(255,255,255,0.85); margin-top: 0;
}
.case-card:hover .desc { max-height: 120px; opacity: 1; margin-top: 10px; }

/* ============ 首页-新闻 ============ */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.news-card {
  background: var(--white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition); display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.news-card .body { padding: 26px 24px; flex: 1; display: flex; flex-direction: column; }
.news-card .date { font-size: 13px; color: var(--accent); letter-spacing: 1px; margin-bottom: 10px; }
.news-card h3 { font-size: 17.5px; color: var(--primary); line-height: 1.5; margin-bottom: 12px; }
.news-card p { font-size: 14px; color: var(--text-light); flex: 1; }
.news-card .more { margin-top: 16px; font-size: 13.5px; color: var(--primary-light); font-weight: 500; }

/* ============ 内页 Banner ============ */
.page-banner {
  position: relative; padding: calc(var(--header-h) + 74px) 0 74px;
  background: linear-gradient(135deg, var(--primary-dark), var(--primary) 55%, #175793);
  color: #fff; overflow: hidden;
}
.page-banner::before {
  content: ""; position: absolute; right: -60px; top: -80px;
  width: 380px; height: 380px; border-radius: 50%;
  border: 44px solid rgba(255,255,255,0.05);
}
.page-banner::after {
  content: ""; position: absolute; left: 8%; bottom: -130px;
  width: 300px; height: 300px; border-radius: 50%;
  border: 34px solid rgba(232,163,61,0.08);
}
.page-banner .en { font-size: 13px; letter-spacing: 5px; color: var(--gold); margin-bottom: 12px; text-transform: uppercase; }
.page-banner h1 { font-size: clamp(28px, 3.6vw, 42px); letter-spacing: 3px; font-weight: 700; }
.page-banner p { margin-top: 12px; color: rgba(255,255,255,0.78); max-width: 720px; }
.breadcrumb { position: absolute; right: 0; bottom: 18px; font-size: 13px; color: rgba(255,255,255,0.6); }
.breadcrumb a:hover { color: var(--gold); }

/* ============ 公司简介 ============ */
.intro-block { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; align-items: center; }
.intro-block + .intro-block { margin-top: 90px; }
.intro-block .media img { border-radius: var(--radius); box-shadow: var(--shadow-hover); width: 100%; object-fit: cover; }
.intro-block h3 { font-size: 24px; color: var(--primary); margin-bottom: 16px; }
.intro-block p { color: var(--text-light); text-align: justify; margin-bottom: 12px; }
.timeline { position: relative; margin-top: 70px; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(180deg, var(--accent), var(--gold)); border-radius: 1px; }
.timeline-item { position: relative; padding: 0 0 34px 26px; }
.timeline-item::before {
  content: ""; position: absolute; left: -30px; top: 6px; width: 14px; height: 14px;
  border-radius: 50%; background: #fff; border: 3px solid var(--accent); box-shadow: 0 0 0 4px rgba(217,43,43,0.12);
}
.timeline-item .year { font-size: 20px; font-weight: 700; color: var(--accent); }
.timeline-item h4 { color: var(--primary); margin: 4px 0 6px; font-size: 17px; }
.timeline-item p { color: var(--text-light); font-size: 14.5px; }

/* 服务范围 */
.scope-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.scope-card {
  background: var(--white); border-radius: var(--radius); padding: 34px 26px;
  box-shadow: var(--shadow); text-align: center; transition: var(--transition);
  border-top: 3px solid transparent;
}
.scope-card:hover { transform: translateY(-8px); border-top-color: var(--accent); box-shadow: var(--shadow-hover); }
.scope-card .icon {
  width: 66px; height: 66px; margin: 0 auto 18px; border-radius: 18px;
  background: linear-gradient(135deg, rgba(15,59,102,0.08), rgba(217,43,43,0.08));
  display: flex; align-items: center; justify-content: center; font-size: 30px;
}
.scope-card h4 { color: var(--primary); font-size: 17px; margin-bottom: 8px; }
.scope-card p { font-size: 13.5px; color: var(--text-light); }

/* 团队 */
.team-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.team-card {
  background: var(--white); border-radius: var(--radius); text-align: center;
  padding: 34px 18px 28px; box-shadow: var(--shadow); transition: var(--transition);
}
.team-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.team-card .avatar {
  width: 84px; height: 84px; margin: 0 auto 16px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 30px; font-weight: 600;
}
.team-card:nth-child(even) .avatar { background: linear-gradient(135deg, var(--accent), var(--gold)); }
.team-card h4 { color: var(--primary); font-size: 17px; }
.team-card span { display: block; font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* ============ 企业资质 ============ */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.cert-grid.three { grid-template-columns: repeat(3, 1fr); }
.cert-card {
  background: var(--white); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: var(--transition); cursor: zoom-in;
}
.cert-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.cert-card .ph { aspect-ratio: 3/4; overflow: hidden; background: #eef2f6; display: flex; align-items: center; justify-content: center; }
.cert-card .ph img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.cert-card:hover .ph img { transform: scale(1.05); }
.cert-card .cap { padding: 16px 18px; text-align: center; }
.cert-card .cap h4 { font-size: 15.5px; color: var(--primary); }
.cert-card .cap span { font-size: 12.5px; color: var(--text-light); }
.patent-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 30px; margin-top: 34px; }
.patent-list li {
  display: flex; align-items: center; gap: 12px; padding: 14px 20px;
  background: var(--white); border-radius: 8px; box-shadow: var(--shadow);
  font-size: 15px; color: var(--text); transition: var(--transition);
}
.patent-list li:hover { transform: translateX(6px); box-shadow: var(--shadow-hover); }
.patent-list li i {
  font-style: normal; width: 26px; height: 26px; border-radius: 50%; flex-shrink: 0;
  background: var(--primary); color: #fff; font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}

/* ============ 技术应用 ============ */
.tech-nav { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 54px; }
.tech-nav button {
  padding: 10px 22px; border-radius: 30px; border: 1px solid #dbe3ec;
  background: var(--white); color: var(--text); font-size: 15px; cursor: pointer;
  transition: var(--transition);
}
.tech-nav button:hover { border-color: var(--primary-light); color: var(--primary); }
.tech-nav button.active { background: var(--primary); border-color: var(--primary); color: #fff; box-shadow: 0 8px 20px rgba(15,59,102,0.25); }
.tech-panel { display: none; animation: panelIn 0.55s ease; }
.tech-panel.active { display: block; }
@keyframes panelIn { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
.tech-detail { display: grid; grid-template-columns: 1.05fr 1fr; gap: 52px; align-items: start; }
.tech-detail .media img { border-radius: var(--radius); box-shadow: var(--shadow-hover); width: 100%; }
.tech-detail .media .sub { margin-top: 16px; }
.tech-detail h3 { font-size: 25px; color: var(--primary); margin-bottom: 6px; }
.tech-detail .en-sub { color: var(--accent); font-size: 12.5px; letter-spacing: 3px; margin-bottom: 18px; text-transform: uppercase; }
.tech-detail p { color: var(--text-light); margin-bottom: 12px; text-align: justify; font-size: 15px; }
.tech-detail h4 { color: var(--primary); font-size: 17px; margin: 20px 0 10px; padding-left: 12px; border-left: 3px solid var(--accent); }
.tech-detail ul.dots li { position: relative; padding: 6px 0 6px 22px; color: var(--text-light); font-size: 15px; }
.tech-detail ul.dots li::before {
  content: ""; position: absolute; left: 0; top: 15px; width: 8px; height: 8px;
  border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--gold));
}
.data-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; background: #fff; border-radius: 8px; overflow: hidden; box-shadow: var(--shadow); }
.data-table th { background: var(--primary); color: #fff; padding: 11px 14px; font-weight: 500; text-align: left; }
.data-table td { padding: 10px 14px; border-bottom: 1px solid #eef1f5; color: var(--text-light); }
.data-table tr:hover td { background: #f7fafd; }
.highlight-num { color: var(--accent); font-weight: 700; }

/* ============ 项目案例 ============ */
.case-filter { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 50px; }
.case-filter button {
  padding: 10px 24px; border-radius: 30px; border: 1px solid #dbe3ec; background: #fff;
  color: var(--text); font-size: 15px; cursor: pointer; transition: var(--transition);
}
.case-filter button.active { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 8px 20px rgba(217,43,43,0.3); }
.case-detail { display: grid; grid-template-columns: 1fr 1.05fr; gap: 46px; align-items: center; margin-bottom: 70px; }
/* 图文左右互换的版式（图片在左） */
.case-detail.alt { grid-template-columns: 1.05fr 1fr; }
.case-detail.alt .media { order: -1; }
.case-detail .media img { border-radius: var(--radius); box-shadow: var(--shadow-hover); width: 100%; object-fit: cover; }
.case-detail h3 { font-size: 23px; color: var(--primary); margin-bottom: 14px; }
.case-detail p { color: var(--text-light); text-align: justify; margin-bottom: 10px; font-size: 15px; }
.case-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.case-tags span {
  font-size: 12.5px; padding: 5px 14px; border-radius: 20px;
  background: rgba(15,59,102,0.07); color: var(--primary);
}
.case-group { margin-bottom: 56px; }
.case-group > h3 {
  font-size: 21px; color: var(--primary); margin-bottom: 22px; padding-left: 14px;
  border-left: 4px solid var(--accent);
}
.case-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px 26px; }
.case-list li {
  padding: 13px 18px; background: var(--white); border-radius: 8px;
  box-shadow: var(--shadow); font-size: 14.5px; color: var(--text);
  transition: var(--transition); display: flex; gap: 10px; align-items: baseline;
}
.case-list li:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); color: var(--primary); }
.case-list li i { font-style: normal; color: var(--accent); font-weight: 600; font-size: 12.5px; }

/* ============ 新闻资讯 ============ */
.news-page-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.news-item {
  display: flex; gap: 24px; background: var(--white); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 26px; transition: var(--transition);
}
.news-item:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.news-item .date-box {
  flex-shrink: 0; width: 82px; height: 92px; border-radius: 10px;
  background: linear-gradient(160deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.news-item .date-box b { font-size: 30px; line-height: 1.1; }
.news-item .date-box span { font-size: 13px; opacity: 0.85; }
.news-item h3 { font-size: 17.5px; color: var(--primary); line-height: 1.5; margin-bottom: 10px; }
.news-item p { font-size: 14px; color: var(--text-light); }

/* ============ 联系我们 ============ */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; margin-bottom: 60px; }
.contact-card {
  background: var(--white); border-radius: var(--radius); padding: 36px 30px;
  box-shadow: var(--shadow); text-align: center; transition: var(--transition);
}
.contact-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-hover); }
.contact-card .icon {
  width: 68px; height: 68px; margin: 0 auto 18px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--gold));
  color: #fff; display: flex; align-items: center; justify-content: center; font-size: 28px;
}
.contact-card:nth-child(2) .icon { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
.contact-card h4 { color: var(--primary); font-size: 18px; margin-bottom: 10px; }
.contact-card p { color: var(--text-light); font-size: 15px; }
.contact-card p b { color: var(--text); font-weight: 600; }
.office-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.office-card {
  background: var(--white); border-radius: var(--radius); padding: 28px 26px;
  box-shadow: var(--shadow); border-left: 4px solid var(--primary); transition: var(--transition);
}
.office-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-left-color: var(--accent); }
.office-card h4 { color: var(--primary); font-size: 17px; margin-bottom: 10px; }
.office-card p { font-size: 14px; color: var(--text-light); }
.map-box {
  margin-top: 60px; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  background: linear-gradient(135deg, #0d2f52, #14508a); color: #fff; padding: 54px 40px;
  position: relative; overflow: hidden;
}
.map-box::before {
  content: ""; position: absolute; inset: 0; opacity: 0.14;
  background-image: radial-gradient(rgba(255,255,255,0.9) 1px, transparent 1px);
  background-size: 26px 26px;
}
.map-box h3 { position: relative; font-size: 22px; margin-bottom: 12px; }
.map-box p { position: relative; color: rgba(255,255,255,0.82); max-width: 720px; }

/* ============ CTA ============ */
.cta-band {
  background: linear-gradient(120deg, var(--primary-dark), var(--primary));
  color: #fff; padding: 74px 0; text-align: center; position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; width: 460px; height: 460px; border-radius: 50%;
  border: 2px dashed rgba(255,255,255,0.12); right: -140px; top: -160px;
  animation: spin 26s linear infinite;
}
.cta-band::after {
  content: ""; position: absolute; width: 300px; height: 300px; border-radius: 50%;
  border: 2px dashed rgba(232,163,61,0.2); left: -100px; bottom: -130px;
  animation: spin 20s linear infinite reverse;
}
@keyframes spin { to { transform: rotate(360deg); } }
.cta-band h2 { position: relative; font-size: clamp(24px, 3vw, 34px); letter-spacing: 2px; }
.cta-band p { position: relative; margin: 14px 0 30px; color: rgba(255,255,255,0.78); }

/* ============ 页脚 ============ */
.site-footer { background: var(--primary-dark); color: rgba(255,255,255,0.72); padding: 70px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 44px; padding-bottom: 50px; }
.footer-grid h4 { color: #fff; font-size: 17px; margin-bottom: 20px; letter-spacing: 1px; }
.footer-grid .brand-line { display: flex; align-items: center; flex-wrap: wrap; gap: 10px 14px; margin-bottom: 18px; }
.footer-grid .brand-line img { height: 34px; width: auto; max-width: 170px; object-fit: contain; border-radius: 4px; flex: none; }
.footer-grid .brand-line b { color: #fff; font-size: 17px; letter-spacing: 1px; line-height: 1.4; }
.footer-grid p { font-size: 14px; line-height: 1.9; }
.footer-links li { margin-bottom: 10px; font-size: 14px; }
.footer-links a:hover { color: var(--gold); padding-left: 4px; }
.footer-contact li { display: flex; gap: 10px; font-size: 14px; margin-bottom: 12px; line-height: 1.7; }
.footer-contact li i { font-style: normal; color: var(--gold); }
/* 备案号：静默链接，前台只显示「京ICP备10015194号」文字，悬停变蓝，点击新窗口跳转工信部 */
.copyright {
  border-top: 1px solid rgba(255,255,255,0.08); padding: 20px 0; text-align: center;
  font-size: 13px; color: rgba(255,255,255,0.45); line-height: 1.9;
}
.icp-link {
  display: inline-block; margin-left: 10px;
  color: rgba(255,255,255,0.5); text-decoration: none;
  transition: color 0.25s ease;
}
.icp-link:hover, .icp-link:focus { color: #4da3ff; }
@media (max-width: 760px) {
  .icp-link { display: block; margin-left: 0; }
}

/* ============ 返回顶部 ============ */
#back-top {
  position: fixed; right: 30px; bottom: 34px; z-index: 900;
  width: 48px; height: 48px; border-radius: 50%; border: none; cursor: pointer;
  background: var(--accent); color: #fff; font-size: 20px;
  box-shadow: 0 10px 26px rgba(217,43,43,0.4);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: var(--transition);
}
#back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
#back-top:hover { background: var(--primary); transform: translateY(-4px); }

/* ============ 灯箱 ============ */
.lightbox {
  position: fixed; inset: 0; z-index: 2000; background: rgba(8, 24, 42, 0.92);
  display: flex; align-items: center; justify-content: center; padding: 40px;
  opacity: 0; visibility: hidden; transition: var(--transition);
}
.lightbox.show { opacity: 1; visibility: visible; }
.lightbox img { max-width: min(880px, 92vw); max-height: 86vh; border-radius: 8px; box-shadow: 0 30px 80px rgba(0,0,0,0.5); }
.lightbox .close {
  position: absolute; top: 26px; right: 34px; font-size: 38px; color: #fff;
  background: none; border: none; cursor: pointer; line-height: 1;
}
.lightbox .cap { position: absolute; bottom: 26px; left: 50%; transform: translateX(-50%); color: rgba(255,255,255,0.85); font-size: 15px; letter-spacing: 1px; }

/* ============ 滚动显现 ============ */
.reveal { opacity: 0; transform: translateY(38px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal.d1 { transition-delay: 0.1s; } .reveal.d2 { transition-delay: 0.2s; }
.reveal.d3 { transition-delay: 0.3s; } .reveal.d4 { transition-delay: 0.4s; }

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .tech-grid, .case-grid, .news-grid, .contact-grid, .office-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid, .team-grid { grid-template-columns: repeat(3, 1fr); }
  .scope-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .intro-block, .tech-detail, .case-detail, .case-detail.alt { grid-template-columns: 1fr; gap: 40px; }
  .about-media .sub-img { right: 0; }
  .case-list { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  :root { --header-h: 60px; }
  /* 移动端菜单：整屏抽屉，层级高于页面内容，header 不使用 filter/transform，
     以保证 fixed 定位相对视口生效（否则菜单会被限制在 header 内被遮挡） */
  .main-nav {
    position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
    background: #fff; padding: 18px 6% 40px; overflow-y: auto; -webkit-overflow-scrolling: touch;
    transform: translateX(100%); transition: transform 0.36s ease;
    z-index: 1200; box-shadow: -8px 0 30px rgba(10, 39, 67, 0.15);
  }
  .main-nav.open { transform: translateX(0); }
  .main-nav > ul { flex-direction: column; gap: 0; }
  .main-nav a.nav-link {
    font-size: 17px; padding: 15px 4px; border-bottom: 1px solid #f0f3f7;
    color: var(--primary) !important;
  }
  .main-nav a.nav-link::after { display: none; }
  .main-nav a.nav-link.active { color: var(--accent) !important; }
  .site-header.transparent .brand-name { color: var(--primary); }
  .site-header.transparent .brand-name span { color: var(--text-light); }
  .site-header.transparent .nav-toggle span { background: var(--primary); }
  .dropdown {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; padding: 0 0 6px 16px; min-width: 0; display: none;
    background: #fafbfd;
  }
  .has-dropdown.open .dropdown { display: block; }
  .dropdown a { color: var(--text); font-size: 15.5px; padding: 11px 14px; }
  .dropdown a::after { display: none; }
  .nav-toggle { display: block; }
  .brand-name { font-size: 16px; }
  .brand-name span { font-size: 10px; letter-spacing: 1px; }
  .brand img { height: 30px; width: auto; max-width: 150px; }
  .footer-grid .brand-line img { height: 30px; max-width: 150px; }
  .footer-grid .brand-line b { font-size: 16px; }
  body.nav-lock { overflow: hidden; }
  .hero { min-height: 520px; }
  .tech-grid, .case-grid, .news-grid, .contact-grid, .office-grid,
  .cert-grid, .cert-grid.three, .team-grid, .scope-grid, .news-page-grid { grid-template-columns: 1fr; }
  .case-detail, .case-detail.alt { grid-template-columns: 1fr; gap: 26px; }
  /* 移动端表格横向滚动，避免溢出屏幕 */
  .data-table { display: block; overflow-x: auto; white-space: nowrap; font-size: 13px; }
  .case-list { grid-template-columns: 1fr; }
  .patent-list { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 34px 12px; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding: 58px 0; }
  .news-item { flex-direction: column; }
  .hero-scroll { display: none; }
  .about-media .exp-badge { left: 8px; top: -18px; padding: 12px 16px; }
  .about-media .exp-badge b { font-size: 24px; }
  .breadcrumb { display: none; }
  .page-banner { padding: calc(var(--header-h) + 46px) 0 46px; }
  .page-banner h1 { font-size: 26px; letter-spacing: 2px; }
  .tech-detail, .case-detail { gap: 26px; }
  .tech-nav button, .case-filter button { font-size: 14px; padding: 9px 16px; }
  #back-top { right: 16px; bottom: 20px; width: 42px; height: 42px; }
  .lightbox { padding: 16px; }
  .lightbox .close { top: 14px; right: 18px; font-size: 32px; }
  .copyright { font-size: 12.5px; line-height: 1.9; }
}