/* ============================================================
   智衡科技 Zhiheng Tech — 全站样式表
   ============================================================ */

/* ---------- 字体本地化 ---------- */
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 400;
  src: url('../fonts/SpaceGrotesk-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 500;
  src: url('../fonts/SpaceGrotesk-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 700;
  src: url('../fonts/SpaceGrotesk-700.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  src: url('../fonts/Inter-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  src: url('../fonts/Inter-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  src: url('../fonts/Inter-600.woff2') format('woff2');
}

/* ---------- 设计令牌 ---------- */
:root {
  --navy-950: #071527;
  --navy-900: #0A1A2F;
  --navy-800: #0E2440;
  --navy-700: #16304F;
  --navy-600: #1F3D63;
  --blue-600: #2E6BFF;
  --blue-500: #4D84FF;
  --blue-300: #8FB0FF;
  --blue-100: #E4EEFF;
  --cyan-400: #38BDF8;
  --cyan-200: #A5E4FB;
  --ink-900: #122036;
  --ink-700: #3D5874;
  --ink-500: #6C86A0;
  --ink-400: #8CA3BA;
  --bg: #F5F8FC;
  --bg-2: #EDF3FA;
  --white: #FFFFFF;
  --line: #E1EAF4;
  --grad: linear-gradient(120deg, #2E6BFF 0%, #38BDF8 100%);
  --grad-soft: linear-gradient(135deg, rgba(46,107,255,.10), rgba(56,189,248,.10));
  --shadow-sm: 0 2px 10px rgba(13, 33, 60, .06);
  --shadow-md: 0 14px 38px rgba(13, 33, 60, .10);
  --shadow-lg: 0 24px 60px rgba(7, 21, 39, .28);
  --r-sm: 10px;
  --r: 14px;
  --r-lg: 20px;
  --font-display: 'Space Grotesk', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --container: 1200px;
  --header-h: 76px;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { font-family: inherit; border: none; background: none; cursor: pointer; }
::selection { background: rgba(46,107,255,.18); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink-900);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: .01em;
}
h1 { font-size: clamp(32px, 4.4vw, 56px); }
h2 { font-size: clamp(26px, 3vw, 38px); }
h3 { font-size: 21px; }
h4 { font-size: 17px; }

.container { width: min(var(--container), 100% - 48px); margin-inline: auto; }
.section { padding: 96px 0; }
.section--tight { padding: 72px 0; }
.section--alt { background: var(--bg); }
.section--dark { background: var(--navy-900); color: #B8C9DE; }

/* ---------- 章节标题 ---------- */
.section-head { max-width: 720px; margin-bottom: 52px; }
.section-head--center { margin-inline: auto; text-align: center; }
.kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 600; color: var(--blue-600);
  letter-spacing: .12em; margin-bottom: 14px;
}
.kicker::before { content: ""; width: 26px; height: 2px; background: var(--grad); border-radius: 2px; }
.section-head--center .kicker::after { content: ""; width: 26px; height: 2px; background: var(--grad); border-radius: 2px; }
.section-head p { margin-top: 14px; font-size: 16.5px; color: var(--ink-500); }
.section-head--center p { margin-inline: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 30px; border-radius: 999px;
  font-size: 15.5px; font-weight: 600; font-family: var(--font-body);
  line-height: 1.2; white-space: nowrap;
  transition: transform .22s ease, box-shadow .22s ease, background .22s ease, color .22s ease, border-color .22s ease;
}
.btn svg { width: 17px; height: 17px; flex: none; }
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px rgba(46,107,255,.35); }
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 16px 32px rgba(46,107,255,.42); }
.btn--ghost-light { border: 1.5px solid rgba(255,255,255,.5); color: #fff; }
.btn--ghost-light:hover { background: rgba(255,255,255,.12); border-color: #fff; transform: translateY(-2px); }
.btn--ghost-dark { border: 1.5px solid var(--blue-600); color: var(--blue-600); background: #fff; }
.btn--ghost-dark:hover { background: var(--blue-100); transform: translateY(-2px); }
.btn--sm { padding: 9px 20px; font-size: 14px; }

/* ---------- 徽标 ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  font-size: 13px; font-weight: 500; color: var(--blue-600);
  background: var(--blue-100);
}
.badge--dark { background: rgba(255,255,255,.12); color: var(--cyan-200); }

/* ============================================================
   顶栏导航
   ============================================================ */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header__inner { display: flex; align-items: center; gap: 40px; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; }
.brand img { height: 44px; width: auto; }
.brand .logo-dark { display: none; }

.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  padding: 8px 15px; border-radius: 999px;
  font-size: 15px; font-weight: 500; color: rgba(255,255,255,.82);
  transition: color .2s ease, background .2s ease;
}
.nav a:hover { color: #fff; background: rgba(255,255,255,.10); }
.nav a.is-active { color: #fff; background: rgba(255,255,255,.14); font-weight: 600; }
.header-cta { display: inline-flex; }

/* 滚动后的实心状态 */
.site-header.is-scrolled { background: rgba(255,255,255,.96); box-shadow: var(--shadow-sm); backdrop-filter: blur(10px); }
.site-header.is-scrolled .nav a { color: var(--ink-700); }
.site-header.is-scrolled .nav a:hover { color: var(--blue-600); background: var(--blue-100); }
.site-header.is-scrolled .nav a.is-active { color: var(--blue-600); background: var(--blue-100); font-weight: 600; }
.site-header.is-scrolled .brand .logo-light { display: none; }
.site-header.is-scrolled .brand .logo-dark { display: block; }

.nav-toggle {
  display: none; width: 44px; height: 44px; border-radius: 10px;
  align-items: center; justify-content: center;
  color: #fff; transition: background .2s;
}
.nav-toggle:hover { background: rgba(255,255,255,.12); }
.site-header.is-scrolled .nav-toggle { color: var(--ink-900); }
.nav-toggle svg { width: 24px; height: 24px; }

/* 移动端菜单 */
.mobile-nav {
  position: fixed; top: var(--header-h); left: 0; right: 0; z-index: 99;
  background: var(--navy-900);
  padding: 18px 24px 28px;
  display: none; flex-direction: column; gap: 4px;
  box-shadow: var(--shadow-lg);
}
.mobile-nav.is-open { display: flex; }
.mobile-nav a {
  padding: 12px 16px; border-radius: var(--r-sm);
  font-size: 16px; font-weight: 500; color: rgba(255,255,255,.85);
}
.mobile-nav a:hover, .mobile-nav a.is-active { background: rgba(255,255,255,.10); color: #fff; }
.mobile-nav .btn { margin-top: 14px; justify-content: center; }

/* ============================================================
   首页 Hero
   ============================================================ */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: calc(var(--header-h) + 40px) 0 90px;
  background:
    linear-gradient(180deg, rgba(7,21,39,.86) 0%, rgba(10,26,47,.62) 45%, rgba(7,21,39,.92) 100%),
    url('../img/hero-main.jpg') center 42% / cover no-repeat;
  color: #fff;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(56,189,248,.6), transparent);
}
.hero__content { max-width: 760px; position: relative; z-index: 1; }
.hero__title {
  color: #fff; font-size: clamp(34px, 4.8vw, 60px);
  margin: 20px 0 22px;
}
.hero__title .grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__sub { font-size: 18px; color: rgba(255,255,255,.78); max-width: 560px; margin-bottom: 36px; }
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 42px; }
.hero__trust {
  display: flex; flex-wrap: wrap; gap: 12px 26px; align-items: center;
  color: rgba(255,255,255,.72); font-size: 14.5px;
}
.hero__trust li { display: inline-flex; align-items: center; gap: 8px; }
.hero__trust svg { width: 16px; height: 16px; color: var(--cyan-400); flex: none; }

/* ---------- 数据条 ---------- */
.stats {
  background: var(--navy-900);
  color: #fff;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.stats__grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 32px; padding: 56px 0;
}
.stat { text-align: center; position: relative; }
.stat + .stat::before {
  content: ""; position: absolute; left: -16px; top: 50%; transform: translateY(-50%);
  width: 1px; height: 52px; background: rgba(255,255,255,.12);
}
.stat__num {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(34px, 3.4vw, 48px); line-height: 1.1;
  color: #fff;
}
.stat__num em { font-style: normal; color: var(--cyan-400); font-size: .62em; margin-left: 2px; }
.stat__label { margin-top: 8px; font-size: 14.5px; color: rgba(255,255,255,.66); }

/* ============================================================
   卡片
   ============================================================ */
.grid { display: grid; gap: 26px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 30px 28px;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(46,107,255,.35); }

/* 服务卡片 */
.service-card__icon {
  width: 56px; height: 56px; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--grad-soft); color: var(--blue-600);
  margin-bottom: 22px;
}
.service-card__icon svg { width: 28px; height: 28px; }
.service-card h3 { margin-bottom: 10px; }
.service-card p { font-size: 14.5px; color: var(--ink-500); }
.service-card .service-card__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.service-card .service-card__tags span {
  font-size: 12.5px; color: var(--ink-500);
  padding: 4px 10px; border-radius: 999px; background: var(--bg-2);
}

/* 图片卡片（案例 / 新闻） */
.media-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .25s ease, box-shadow .25s ease;
}
.media-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.media-card__img { position: relative; aspect-ratio: 3 / 2; overflow: hidden; }
.media-card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.media-card:hover .media-card__img img { transform: scale(1.05); }
.media-card__img .badge { position: absolute; top: 14px; left: 14px; }
.media-card__body { padding: 22px 24px 26px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.media-card__body h3 { font-size: 18px; line-height: 1.45; }
.media-card__body p { font-size: 14.5px; color: var(--ink-500); flex: 1; }
.media-card__meta { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--ink-400); }
.media-card__meta svg { width: 14px; height: 14px; }

/* 行业方案卡片 */
.solution-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 30px 28px; position: relative; overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.solution-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); border-color: rgba(46,107,255,.35); }
.solution-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--grad); opacity: 0; transition: opacity .25s ease;
}
.solution-card:hover::before { opacity: 1; }
.solution-card__icon {
  width: 52px; height: 52px; border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--navy-900); color: var(--cyan-400); margin-bottom: 20px;
}
.solution-card__icon svg { width: 26px; height: 26px; }
.solution-card h3 { margin-bottom: 10px; }
.solution-card p { font-size: 14.5px; color: var(--ink-500); margin-bottom: 16px; }
.solution-card ul { display: flex; flex-direction: column; gap: 8px; }
.solution-card ul li {
  font-size: 14px; color: var(--ink-700);
  display: flex; align-items: flex-start; gap: 8px;
}
.solution-card ul li::before {
  content: ""; flex: none; width: 6px; height: 6px; border-radius: 50%;
  background: var(--blue-500); margin-top: 8px;
}

/* ---------- 特性行（图文交替） ---------- */
.feature-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
  padding: 44px 0;
}
.feature-row + .feature-row { border-top: 1px solid var(--line); }
.feature-row--rev .feature-row__media { order: 2; }
.feature-row__media { border-radius: var(--r-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.feature-row__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4 / 3; }
.feature-row__body h3 { margin-bottom: 14px; font-size: 24px; }
.feature-row__body p { font-size: 15.5px; color: var(--ink-500); margin-bottom: 18px; }
.feature-points { display: flex; flex-direction: column; gap: 12px; }
.feature-points li { display: flex; gap: 12px; font-size: 15px; color: var(--ink-700); }
.feature-points li svg { width: 20px; height: 20px; color: var(--blue-500); flex: none; margin-top: 2px; }
.feature-points li strong { color: var(--ink-900); font-weight: 600; }

/* ---------- 技术能力（深色带） ---------- */
.tech-band { position: relative; overflow: hidden; }
.tech-band::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(600px 300px at 85% 10%, rgba(56,189,248,.16), transparent 60%),
    radial-gradient(500px 260px at 10% 90%, rgba(46,107,255,.20), transparent 60%);
}
.tech-band .container { position: relative; z-index: 1; }
.tech-band h2, .tech-band h3 { color: #fff; }
.tech-band .kicker { color: var(--cyan-400); }
.tech-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.tech-item {
  border: 1px solid rgba(255,255,255,.14); border-radius: var(--r-lg);
  padding: 30px 26px; background: rgba(255,255,255,.05);
  transition: background .25s ease, transform .25s ease, border-color .25s ease;
}
.tech-item:hover { background: rgba(255,255,255,.10); transform: translateY(-4px); border-color: rgba(56,189,248,.5); }
.tech-item svg { width: 30px; height: 30px; color: var(--cyan-400); margin-bottom: 18px; }
.tech-item h3 { font-size: 18px; margin-bottom: 8px; }
.tech-item p { font-size: 14px; color: rgba(255,255,255,.62); }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden; color: #fff;
  background:
    linear-gradient(120deg, rgba(46,107,255,.92), rgba(56,189,248,.88)),
    var(--navy-800);
}
.cta-band::after {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(420px 220px at 88% 50%, rgba(255,255,255,.22), transparent 65%);
}
.cta-band .container { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { color: #fff; font-size: clamp(24px, 2.6vw, 34px); margin-bottom: 10px; }
.cta-band p { color: rgba(255,255,255,.86); font-size: 16px; }
.cta-band .btn--white { background: #fff; color: var(--blue-600); }
.cta-band .btn--white:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(7,21,39,.3); }
.cta-band .btn--ghost-light { border-color: rgba(255,255,255,.65); }

/* ============================================================
   内页 Hero
   ============================================================ */
.page-hero {
  position: relative; padding: calc(var(--header-h) + 88px) 0 84px; color: #fff;
  background-size: cover; background-position: center;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(7,21,39,.82) 0%, rgba(10,26,47,.68) 60%, rgba(7,21,39,.86) 100%);
}
.page-hero .container { position: relative; z-index: 1; }
.page-hero--services { background-image: url('../img/hero-services.jpg'); }
.page-hero--solutions { background-image: url('../img/hero-solutions.jpg'); }
.page-hero--cases { background-image: url('../img/hero-cases.jpg'); }
.page-hero--about { background-image: url('../img/hero-about.jpg'); }
.page-hero--news { background-image: url('../img/hero-news.jpg'); }
.page-hero--contact { background-image: url('../img/contact-office.jpg'); }
.crumbs { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255,255,255,.66); margin-bottom: 20px; }
.crumbs a:hover { color: #fff; }
.crumbs svg { width: 14px; height: 14px; }
.page-hero h1 { color: #fff; margin-bottom: 18px; }
.page-hero__sub { font-size: 17.5px; color: rgba(255,255,255,.78); max-width: 640px; }

/* ============================================================
   关于页：时间轴
   ============================================================ */
.timeline { display: grid; gap: 0; max-width: 860px; }
.tl-row {
  display: grid; grid-template-columns: 132px 64px 1fr;
  padding: 26px 0;
}
.tl-row + .tl-row { border-top: 1px solid var(--line); }
.tl-year {
  font-family: var(--font-display); font-weight: 700; font-size: 20px; color: var(--blue-600);
  padding-top: 4px;
}
.tl-axis { position: relative; display: flex; justify-content: center; }
.tl-axis::before {
  content: ""; position: absolute; top: 0; bottom: 0; left: 50%;
  width: 2px; background: linear-gradient(180deg, var(--blue-600), var(--cyan-400));
  transform: translateX(-50%);
}
.tl-dot {
  position: relative; z-index: 1; align-self: center;
  width: 13px; height: 13px; border-radius: 50%;
  background: #fff; border: 3px solid var(--blue-600);
  box-shadow: 0 0 0 4px rgba(46,107,255,.18);
}
.tl-row:first-child .tl-axis::before { top: 50%; }
.tl-row:last-child .tl-axis::before { bottom: 50%; }
.tl-content h4 { font-size: 17px; margin-bottom: 6px; }
.tl-content p { font-size: 14.5px; color: var(--ink-500); }

/* ---------- 资质证书 ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.cert-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 28px 24px; text-align: center;
  transition: transform .25s ease, box-shadow .25s ease;
}
.cert-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.cert-card__icon {
  width: 60px; height: 60px; margin: 0 auto 16px; border-radius: 50%;
  background: var(--grad-soft); color: var(--blue-600);
  display: flex; align-items: center; justify-content: center;
}
.cert-card__icon svg { width: 30px; height: 30px; }
.cert-card h4 { font-size: 16px; margin-bottom: 6px; }
.cert-card p { font-size: 13.5px; color: var(--ink-400); }

/* ---------- 团队 ---------- */
.team-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 30px 28px; display: flex; gap: 22px; align-items: center;
}
.team-avatar {
  flex: none; width: 74px; height: 74px; border-radius: 50%;
  background: var(--navy-900); color: var(--cyan-400);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 700; font-size: 24px;
  border: 3px solid var(--blue-100);
}
.team-card h4 { font-size: 17px; margin-bottom: 4px; }
.team-card .role { font-size: 13.5px; color: var(--blue-600); font-weight: 600; margin-bottom: 8px; }
.team-card p { font-size: 14px; color: var(--ink-500); }

/* ---------- 价值观 ---------- */
.value-card { text-align: center; padding: 38px 26px; }
.value-card svg { width: 34px; height: 34px; color: var(--blue-600); margin: 0 auto 18px; }
.value-card h3 { font-size: 18px; margin-bottom: 10px; }
.value-card p { font-size: 14.5px; color: var(--ink-500); }

/* ---------- 客户 Logo 墙 ---------- */
.logo-wall { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.logo-wall__item {
  display: flex; align-items: center; justify-content: center;
  height: 84px; border: 1px solid var(--line); border-radius: var(--r-sm);
  background: #fff; color: var(--ink-400);
  font-family: var(--font-display); font-weight: 700; font-size: 19px; letter-spacing: .06em;
  transition: color .25s ease, border-color .25s ease, transform .25s ease;
}
.logo-wall__item:hover { color: var(--navy-800); border-color: var(--blue-300); transform: translateY(-3px); }
.logo-wall__item small { font-size: 11px; font-weight: 500; letter-spacing: .18em; display: block; margin-top: 2px; color: var(--ink-400); }

/* ============================================================
   案例页
   ============================================================ */
.case-study {
  display: grid; grid-template-columns: 460px 1fr; gap: 52px; align-items: center;
  padding: 52px 0;
}
.case-study + .case-study { border-top: 1px solid var(--line); }
.case-study__media { border-radius: var(--r-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.case-study__media img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.case-study__body .kicker { margin-bottom: 10px; }
.case-study__body h3 { font-size: 25px; margin-bottom: 14px; }
.case-study__body > p { font-size: 15.5px; color: var(--ink-500); margin-bottom: 22px; }
.cs-block { margin-bottom: 16px; }
.cs-block h4 { font-size: 15px; color: var(--blue-600); margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.cs-block h4::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--grad); }
.cs-block p { font-size: 14.5px; color: var(--ink-700); }
.cs-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 24px; }
.cs-metric {
  background: var(--bg-2); border-radius: var(--r-sm); padding: 16px 14px; text-align: center;
}
.cs-metric strong {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 24px; color: var(--navy-800); line-height: 1.2;
}
.cs-metric span { font-size: 12.5px; color: var(--ink-500); }

/* ============================================================
   新闻页
   ============================================================ */
.featured-article {
  display: grid; grid-template-columns: 1.15fr 1fr; gap: 48px; align-items: center;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.featured-article__media img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 10; }
.featured-article__body { padding: 40px 44px 40px 0; }
.featured-article__body h3 { font-size: 27px; line-height: 1.4; margin: 16px 0 14px; }
.featured-article__body p { font-size: 15.5px; color: var(--ink-500); margin-bottom: 22px; }
.news-list .media-card h3 { font-size: 16.5px; }

/* ---------- 文章正文（头条详情） ---------- */
.article-body { max-width: 860px; }
.article-body h3 { font-size: 22px; margin: 34px 0 12px; }
.article-body p { font-size: 16px; color: var(--ink-700); margin-bottom: 16px; }
.article-body ul { list-style: none; margin-bottom: 18px; }
.article-body ul li { font-size: 15.5px; color: var(--ink-700); padding-left: 22px; position: relative; margin-bottom: 8px; }
.article-body ul li::before { content: ""; position: absolute; left: 4px; top: 11px; width: 7px; height: 7px; border-radius: 50%; background: var(--blue-500); }

/* ============================================================
   联系页
   ============================================================ */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.contact-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 30px 26px; text-align: center;
  transition: transform .25s ease, box-shadow .25s ease;
}
.contact-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.contact-card__icon {
  width: 58px; height: 58px; margin: 0 auto 18px; border-radius: 16px;
  background: var(--grad-soft); color: var(--blue-600);
  display: flex; align-items: center; justify-content: center;
}
.contact-card__icon svg { width: 28px; height: 28px; }
.contact-card h3 { font-size: 17px; margin-bottom: 6px; }
.contact-card p { font-size: 14.5px; color: var(--ink-500); }
.contact-card a.value {
  display: inline-block; margin-top: 10px;
  font-family: var(--font-display); font-weight: 700; font-size: 19px; color: var(--navy-800);
}
.contact-card a.value:hover { color: var(--blue-600); }

.office-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.office-card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 28px 24px;
}
.office-card h3 { font-size: 17px; margin-bottom: 4px; display: flex; align-items: center; gap: 8px; }
.office-card h3 svg { width: 18px; height: 18px; color: var(--blue-500); }
.office-card .city-en { font-size: 12.5px; color: var(--ink-400); letter-spacing: .14em; margin-bottom: 14px; }
.office-card ul { display: flex; flex-direction: column; gap: 8px; }
.office-card ul li { font-size: 14px; color: var(--ink-700); display: flex; gap: 8px; }
.office-card ul li svg { width: 15px; height: 15px; color: var(--blue-500); flex: none; margin-top: 4px; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 820px; }
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  margin-bottom: 14px; overflow: hidden;
}
.faq-item.is-open { border-color: rgba(46,107,255,.4); box-shadow: var(--shadow-sm); }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 20px 24px; text-align: left;
  font-size: 16px; font-weight: 600; color: var(--ink-900); font-family: var(--font-body);
}
.faq-q svg { width: 20px; height: 20px; color: var(--blue-500); flex: none; transition: transform .25s ease; }
.faq-item.is-open .faq-q svg { transform: rotate(45deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 24px 22px; font-size: 15px; color: var(--ink-500); }

/* ============================================================
   页脚
   ============================================================ */
.site-footer { background: var(--navy-950); color: #93A9C2; font-size: 14.5px; }
.footer-main {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 48px;
  padding: 72px 0 56px;
}
.footer-brand img { height: 42px; width: auto; margin-bottom: 20px; }
.footer-brand p { max-width: 300px; color: #7D93AC; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 15.5px; margin-bottom: 20px; }
.footer-col ul { display: flex; flex-direction: column; gap: 11px; }
.footer-col ul a { color: #93A9C2; transition: color .2s; }
.footer-col ul a:hover { color: var(--cyan-400); }
.footer-contact li { display: flex; gap: 10px; margin-bottom: 12px; align-items: flex-start; }
.footer-contact svg { width: 17px; height: 17px; color: var(--blue-500); flex: none; margin-top: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding: 22px 0;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 13.5px; color: #6C84A0;
}
.footer-bottom a { color: #8BA3BE; }
.footer-bottom a:hover { color: var(--cyan-400); }
.footer-links { display: flex; gap: 22px; }

/* ============================================================
   返回顶部 & 通用
   ============================================================ */
.back-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 90;
  width: 46px; height: 46px; border-radius: 50%;
  background: var(--navy-900); color: #fff;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s;
  box-shadow: var(--shadow-md);
}
.back-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.back-top:hover { background: var(--blue-600); }
.back-top svg { width: 20px; height: 20px; }

.divider { height: 1px; background: var(--line); border: none; }

/* 滚动显现动画 */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .media-card:hover .media-card__img img { transform: none; }
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
  .office-grid { grid-template-columns: repeat(2, 1fr); }
  .logo-wall { grid-template-columns: repeat(3, 1fr); }
  .feature-row { gap: 40px; }
  .case-study { grid-template-columns: 1fr; gap: 32px; }
  .footer-main { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 880px) {
  .nav, .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .section { padding: 72px 0; }
  .stats__grid { grid-template-columns: repeat(2, 1fr); gap: 36px 20px; }
  .stat + .stat::before { display: none; }
  .feature-row { grid-template-columns: 1fr; gap: 28px; }
  .feature-row--rev .feature-row__media { order: 0; }
  .featured-article { grid-template-columns: 1fr; }
  .featured-article__body { padding: 8px 28px 34px; }
  .tl-row { grid-template-columns: 92px 44px 1fr; }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4, .tech-grid, .cert-grid, .contact-grid, .office-grid { grid-template-columns: 1fr; }
  .logo-wall { grid-template-columns: repeat(2, 1fr); }
  .stats__grid { grid-template-columns: 1fr 1fr; }
  .hero { padding-bottom: 64px; }
  .hero__actions .btn { width: 100%; }
  .footer-main { grid-template-columns: 1fr; gap: 34px; }
  .cs-metrics { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .cs-metric { padding: 14px 8px; }
  .cs-metric strong { font-size: 20px; }
  .tl-row { grid-template-columns: 72px 36px 1fr; padding: 20px 0; }
  .tl-year { font-size: 17px; }
  .section-head { margin-bottom: 38px; }
}