/* =============================================================
   海泰钢管集团 · 江苏片区  门户视觉系统（大气 / 工业 / 克制）
   - 深色钢蓝为"大气"底色，集团红 #C62828 为唯一强调色（占位待官网复核）
   - 动效：滚动渐显、数字计数、地图连线、卡片悬浮；均尊重 reduced-motion
   - 零框架依赖，纯 CSS + 原生 JS
   ============================================================= */

:root {
  /* 品牌与底色 */
  --brand: #C62828;          /* 集团品牌红（占位值，上线前以集团官网 CSS 复核） */
  --brand-dark: #9E1B1B;
  --brand-soft: #FBE9E9;
  --ink: #0C1622;           /* 深钢蓝（Hero / 深色区） */
  --ink-2: #122231;
  --ink-3: #1B3145;
  --navy: #16293B;
  --paper: #FFFFFF;
  --bg: #F4F6F8;             /* 浅灰内容底 */
  --bg-2: #EAF0F4;
  --text: #16222F;
  --text-2: #56636F;
  --text-3: #8A97A3;
  --line: #DEE5EC;
  --line-dark: rgba(255,255,255,.14);

  /* 尺度 */
  --maxw: 1240px;
  --header-h: 76px;
  --radius: 14px;
  --radius-lg: 24px;
  --shadow: 0 12px 34px rgba(12,22,34,.09);
  --shadow-lg: 0 30px 70px rgba(12,22,34,.18);
  --ease: cubic-bezier(.22,.61,.36,1);

  --font: "Microsoft YaHei","PingFang SC","Source Han Sans SC","Noto Sans SC",
          "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--paper);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1,h2,h3,h4 { margin: 0; line-height: 1.2; font-weight: 800; letter-spacing: .5px; }
p { margin: 0 0 1em; }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 3px; border-radius: 4px; }

/* ---------- 布局容器 ---------- */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; position: relative; }
.section--tight { padding: 72px 0; }
.section--dark { background: var(--ink); color: #EAF0F6; }
.section--soft { background: var(--bg); }
.section--paper { background: var(--paper); }

/* 区块小标题（大连字 + 红短线，大气工业感） */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 14px; font-weight: 700; letter-spacing: 2px;
  color: var(--brand); text-transform: uppercase; margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 30px; height: 3px; background: var(--brand); border-radius: 2px; }
.section--dark .eyebrow { color: #FF8A8A; }
.section--dark .eyebrow::before { background: #FF8A8A; }

.section-title {
  font-size: clamp(28px, 4vw, 44px);
  color: var(--ink);
  margin-bottom: 14px;
  letter-spacing: 1px;
}
.section--dark .section-title { color: #fff; }
.section-sub {
  font-size: 17px; color: var(--text-2); max-width: 720px;
  margin: 0 auto 48px; line-height: 1.8;
}
.section--dark .section-sub { color: #B9C6D3; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-head .section-sub { margin-left: auto; margin-right: auto; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 15px 30px; border-radius: 999px; font-size: 16px; font-weight: 700;
  cursor: pointer; border: 2px solid transparent; transition: all .3s var(--ease);
  letter-spacing: 1px; white-space: nowrap;
}
.btn--primary { background: var(--brand); color: #fff; box-shadow: 0 10px 26px rgba(198,40,40,.32); }
.btn--primary:hover { background: var(--brand-dark); transform: translateY(-3px); box-shadow: 0 16px 34px rgba(198,40,40,.42); }
.btn--ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.55); }
.btn--ghost:hover { background: #fff; color: var(--ink); transform: translateY(-3px); }
.btn--line { background: transparent; color: var(--brand); border-color: var(--brand); }
.btn--line:hover { background: var(--brand); color: #fff; transform: translateY(-3px); }
.btn--dark { background: var(--ink); color: #fff; }
.btn--dark:hover { background: var(--ink-3); transform: translateY(-3px); }
.btn .arrow { transition: transform .3s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; height: var(--header-h);
  z-index: 1000; display: flex; align-items: center;
  background: transparent; transition: background .35s var(--ease), box-shadow .35s var(--ease), height .35s var(--ease);
}
.site-header.scrolled {
  background: rgba(255,255,255,.96); backdrop-filter: saturate(160%) blur(10px);
  box-shadow: 0 6px 24px rgba(12,22,34,.10); height: 64px;
}
.nav { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; transition: color .35s var(--ease); }
.site-header.scrolled .brand { color: var(--ink); }
.brand__mark {
  width: 38px; height: 38px; border-radius: 9px; flex: none;
  background: var(--brand); color: #fff; display: grid; place-items: center;
  font-weight: 900; font-size: 20px; box-shadow: 0 6px 16px rgba(198,40,40,.4);
}
.brand__txt { display: flex; align-items: baseline; gap: 6px; white-space: nowrap; }
.brand__name { font-size: 17px; font-weight: 800; letter-spacing: 1px; }
.brand__sub { font-size: 11px; letter-spacing: 1px; opacity .8; }
.nav__links { display: flex; align-items: center; gap: 2px; }
.nav__links a {
  position: relative; padding: 10px 12px; font-size: 15px; font-weight: 600;
  color: rgba(255,255,255,.9); transition: color .3s var(--ease); border-radius: 8px;
}
.site-header.scrolled .nav__links a { color: var(--text); }
.nav__links a::after {
  content: ""; position: absolute; left: 16px; right: 16px; bottom: 4px; height: 2px;
  background: var(--brand); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease);
}
.nav__links a:hover::after, .nav__links a.active::after { transform: scaleX(1); }
.nav__links a:hover { color: #fff; }
.site-header.scrolled .nav__links a:hover { color: var(--brand); }
.nav__cta { display: flex; align-items: center; gap: 8px; }
.nav__cta .btn { padding: 10px 20px; font-size: 14px; }
.nav__phone { display: inline-flex; align-items: center; gap: 6px; color: #fff; font-weight: 700; font-size: 14px; }
.site-header.scrolled .nav__phone { color: var(--brand); }
.nav__toggle { display: none; width: 44px; height: 44px; border: none; background: transparent; cursor: pointer; padding: 10px; }
.nav__toggle span { display: block; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px; transition: .3s; }
.site-header.scrolled .nav__toggle span { background: var(--ink); }

/* ---------- HERO ---------- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  color: #fff; overflow: hidden; isolation: isolate;
}
/* Hero 媒体层：图片始终兜底；视频由 JS 在播放成功后加 .has-video 才显示 */
.hero__media {
  position: absolute; inset: 0; z-index: -3;
}
.hero__video {
  width: 100%; height: 100%; object-fit: cover;
  display: none; /* 默认隐藏，JS 注入源并成功播放后才显示 */
}
.hero__media.has-video .hero__video { display: block; }
.hero__media.has-video .hero__bg { display: none; }
.hero__bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center center;
  /* 无真实照片时的深色渐变占位底：被 inline style 覆盖后失效 */
  background:
    radial-gradient(120% 90% at 80% 10%, rgba(198,40,40,.28), transparent 55%),
    linear-gradient(160deg, #0C1622 0%, #122A3E 48%, #0A141F 100%);
}
/* 工业质感叠层（管道/网格抽象，无照片时也有"大气"底纹） */
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 80% at 50% 30%, #000 30%, transparent 80%);
}
.hero__overlay {
  position: absolute; inset: 0; z-index: -2;
  background: linear-gradient(90deg, rgba(8,16,26,.86) 0%, rgba(8,16,26,.55) 50%, rgba(8,16,26,.25) 100%);
}
.hero__inner { padding: 120px 0 90px; width: 100%; }
.hero__eyebrow {
  display: inline-flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 700;
  letter-spacing: 3px; color: #FF8A8A; margin-bottom: 22px;
  opacity: 0; animation: fadeUp .9s var(--ease) .15s forwards;
}
.hero__eyebrow::before { content: ""; width: 36px; height: 3px; background: var(--brand); border-radius: 2px; }
.hero h1 {
  font-size: clamp(36px, 6.4vw, 76px); line-height: 1.08; letter-spacing: 2px;
  max-width: 16ch; margin-bottom: 24px; text-shadow: 0 4px 30px rgba(0,0,0,.4);
  opacity: 0; animation: fadeUp 1s var(--ease) .3s forwards;
}
.hero h1 .accent { color: #FF6B6B; }
.hero__sub {
  font-size: clamp(16px, 1.6vw, 20px); color: #D7E0E9; max-width: 60ch; line-height: 1.85;
  margin-bottom: 38px; opacity: 0; animation: fadeUp 1s var(--ease) .5s forwards;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 54px;
  opacity: 0; animation: fadeUp 1s var(--ease) .7s forwards; }
.hero__scroll {
  position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: rgba(255,255,255,.7); font-size: 12px; letter-spacing: 2px; z-index: 2;
}
.hero__scroll .mouse { width: 24px; height: 40px; border: 2px solid rgba(255,255,255,.6); border-radius: 14px; position: relative; }
.hero__scroll .mouse::after { content: ""; position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; background: #fff; border-radius: 2px; transform: translateX(-50%); animation: scrollDot 1.6s var(--ease) infinite; }
@keyframes scrollDot { 0%{opacity:0;transform:translate(-50%,0)} 40%{opacity:1} 80%{opacity:0;transform:translate(-50%,14px)} 100%{opacity:0} }

/* HERO 底部业务识别条 */
.hero-strip {
  position: relative; z-index: 2; background: rgba(10,18,28,.7); backdrop-filter: blur(6px);
  border-top: 1px solid rgba(255,255,255,.08);
}
.hero-strip__row { display: flex; flex-wrap: wrap; }
.hero-strip__item {
  flex: 1 1 0; min-width: 150px; padding: 20px 18px; text-align: center;
  border-right: 1px solid rgba(255,255,255,.08); color: #E7EDF3;
  font-weight: 700; font-size: 16px; letter-spacing: 1px;
  transition: background .3s var(--ease), color .3s var(--ease);
}
.hero-strip__item:last-child { border-right: none; }
.hero-strip__item:hover { background: var(--brand); color: #fff; }

/* ---------- 滚动渐显 ---------- */
.reveal { opacity: 0; transform: translateY(34px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in-view { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .1s; }
.reveal[data-delay="2"] { transition-delay: .2s; }
.reveal[data-delay="3"] { transition-delay: .3s; }
.reveal[data-delay="4"] { transition-delay: .4s; }
.reveal[data-delay="5"] { transition-delay: .5s; }

/* ---------- 集团实力数字带 ---------- */
.stats-band { background: var(--ink); color: #fff; }
.stats-band__grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; background: rgba(255,255,255,.1); }
.stat {
  background: var(--ink); padding: 36px 14px; text-align: center;
  position: relative; overflow: hidden;
}
.stat::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 3px; background: var(--brand); transform: scaleX(0); transform-origin: left; transition: transform .6s var(--ease) .2s; }
.stat.in-view::before { transform: scaleX(1); }
.stat__num { font-size: clamp(30px, 3.6vw, 48px); font-weight: 900; color: #fff; line-height: 1; letter-spacing: 1px; }
.stat__num .u { font-size: .5em; color: #FF8A8A; margin-left: 4px; font-weight: 800; }
.stat__num--text { font-size: clamp(14px, 1.6vw, 18px); font-weight: 700; color: #fff; line-height: 1.35; letter-spacing: .3px; }
.stat__label { margin-top: 10px; font-size: 13px; color: #AEBCCB; letter-spacing: .5px; }
.stats-band__note { text-align: center; margin-top: 26px; font-size: 13px; color: #7E90A2; }

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

.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 34px 30px; transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
  position: relative; overflow: hidden;
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card__no { font-size: 14px; font-weight: 800; color: var(--brand); letter-spacing: 2px; }
.card h3 { font-size: 21px; margin: 10px 0 12px; color: var(--ink); }
.card p { color: var(--text-2); font-size: 15px; }

/* 行业大卡（带图，悬浮放大） */
.ind-card {
  position: relative; border-radius: var(--radius-lg); overflow: hidden; min-height: 340px;
  display: flex; align-items: flex-end; color: #fff; box-shadow: var(--shadow);
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.ind-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-lg); }
.ind-card__media { position: absolute; inset: 0; background: linear-gradient(160deg,#1a2b3d,#0c1622); transition: transform .8s var(--ease); }
.ind-card:hover .ind-card__media { transform: scale(1.08); }
.ind-card__media::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(8,16,26,.15) 0%, rgba(8,16,26,.82) 100%); }
.ind-card__body { position: relative; padding: 30px 28px; z-index: 2; }
.ind-card__tag { display: inline-block; font-size: 12px; letter-spacing: 2px; color: #FFB3B3; margin-bottom: 8px; }
.ind-card h3 { font-size: 24px; margin-bottom: 8px; }
.ind-card p { font-size: 14.5px; color: #D2DCE6; margin: 0; }
.ind-card .link-more { display: inline-flex; align-items: center; gap: 6px; margin-top: 14px; font-weight: 700; color: #fff; font-size: 14px; }
.ind-card .link-more .arrow { transition: transform .3s var(--ease); }
.ind-card:hover .link-more .arrow { transform: translateX(5px); }

/* 产品卡 */
.prod-card { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.prod-card__head { padding: 26px 26px 18px; border-bottom: 1px solid var(--line); }
.prod-card__icon { width: 46px; height: 46px; border-radius: 12px; background: var(--brand-soft); color: var(--brand); display: grid; place-items: center; font-size: 22px; font-weight: 900; margin-bottom: 14px; }
.prod-card h3 { font-size: 19px; color: var(--ink); }
.prod-card__body { padding: 20px 26px 26px; flex: 1; }
.prod-card__body dl { margin: 0; font-size: 14px; }
.prod-card__body dt { color: var(--text-3); font-size: 12px; letter-spacing: 1px; margin-top: 12px; }
.prod-card__body dd { margin: 2px 0 0; color: var(--text); }
.prod-card__foot { padding: 16px 26px; border-top: 1px solid var(--line); display: flex; gap: 12px; }
.prod-note { font-size: 12px; color: var(--text-3); padding: 0 26px 22px; }

/* 案例卡 */
.case-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case-card__media { height: 190px; background: linear-gradient(135deg,#1a2b3d,#0c1622); position: relative; display: grid; place-items: center; color: #5d7286; font-size: 13px; letter-spacing: 1px; }
.case-card__cat { position: absolute; top: 14px; left: 14px; background: rgba(198,40,40,.92); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 12px; border-radius: 999px; }
.case-card__body { padding: 24px 26px 28px; }
.case-card h3 { font-size: 19px; color: var(--ink); margin-bottom: 10px; }
.case-card p { font-size: 14.5px; color: var(--text-2); }
.case-card .link-more { margin-top: 14px; display: inline-flex; gap: 6px; color: var(--brand); font-weight: 700; font-size: 14px; }

/* ---------- 服务流程 ---------- */
.flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
.flow__item { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px 22px; position: relative; }
.flow__item::before { counter-increment: step; content: "0" counter(step); position: absolute; top: 18px; right: 22px; font-size: 30px; font-weight: 900; color: var(--brand-soft); }
.flow__item .ico { width: 50px; height: 50px; border-radius: 12px; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 22px; margin-bottom: 16px; }
.flow__item h4 { font-size: 17px; color: var(--ink); margin-bottom: 8px; }
.flow__item p { font-size: 13.5px; color: var(--text-2); margin: 0; }

/* ---------- 江苏三地协同地图 ---------- */
.region { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items: center; }
.map-wrap { position: relative; background: var(--ink-2); border-radius: var(--radius-lg); padding: 30px; overflow: hidden; }
.map-wrap::before { content:""; position:absolute; inset:0; background-image: radial-gradient(rgba(255,255,255,.05) 1px, transparent 1px); background-size: 22px 22px; }
.map-svg { width: 100%; height: auto; display: block; position: relative; }
.map-line { stroke: var(--brand); stroke-width: 2; fill: none; stroke-dasharray: 600; stroke-dashoffset: 600; opacity: .85; }
.map-line.draw { animation: drawLine 1.6s var(--ease) forwards; }
@keyframes drawLine { to { stroke-dashoffset: 0; } }
.map-node { fill: var(--brand); }
.map-node--pulse { animation: pulse 2.4s var(--ease) infinite; transform-origin: center; transform-box: fill-box; }
@keyframes pulse { 0%{ r: 7; opacity: 1 } 70%{ r: 18; opacity: 0 } 100%{ r: 18; opacity: 0 } }
.map-label { fill: #EAF0F6; font-size: 14px; font-weight: 700; font-family: var(--font); }
.map-label--sub { fill: #8FA3B5; font-size: 11px; font-weight: 400; }
.region__cities { display: grid; gap: 16px; }
.city-card { background: var(--paper); border: 1px solid var(--line); border-left: 4px solid var(--brand); border-radius: 12px; padding: 20px 22px; transition: transform .3s var(--ease), box-shadow .3s var(--ease); }
.city-card:hover { transform: translateX(6px); box-shadow: var(--shadow); }
.city-card h4 { font-size: 18px; color: var(--ink); margin-bottom: 6px; }
.city-card p { font-size: 14px; color: var(--text-2); margin: 0; }

/* ---------- 为什么选我们 ---------- */
.why { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.why__item { text-align: center; padding: 30px 18px; border-radius: var(--radius); background: var(--bg); }
.why__ico { width: 58px; height: 58px; border-radius: 50%; background: var(--brand-soft); color: var(--brand); display: grid; place-items: center; font-size: 26px; margin: 0 auto 16px; }
.why__item h4 { font-size: 17px; color: var(--ink); margin-bottom: 8px; }
.why__item p { font-size: 13.5px; color: var(--text-2); margin: 0; }

/* ---------- CTA 区 ---------- */
.cta-band { background: linear-gradient(120deg, var(--brand-dark), var(--brand)); color: #fff; border-radius: var(--radius-lg); padding: 56px 48px; text-align: center; position: relative; overflow: hidden; }
.cta-band::after { content:""; position:absolute; right:-60px; top:-60px; width:260px; height:260px; border-radius:50%; background: rgba(255,255,255,.12); }
.cta-band h2 { font-size: clamp(26px,3.4vw,38px); margin-bottom: 14px; }
.cta-band p { color: rgba(255,255,255,.9); max-width: 620px; margin: 0 auto 28px; }
.cta-band .btn--ghost { border-color: rgba(255,255,255,.8); }
.cta-band .btn--ghost:hover { background: #fff; color: var(--brand); }

/* ---------- 联系区 ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.contact-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 30px; }
.contact-card h3 { font-size: 20px; color: var(--ink); margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.contact-card h3 .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--brand); }
.contact-list { list-style: none; margin: 0; padding: 0; }
.contact-list li { padding: 12px 0; border-bottom: 1px dashed var(--line); display: flex; gap: 12px; font-size: 15px; }
.contact-list li:last-child { border-bottom: none; }
.contact-list .k { color: var(--text-3); min-width: 76px; }
.contact-list .v { color: var(--text); font-weight: 600; }
.contact-list a.v:hover { color: var(--brand); }

/* 表单 */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: 13px; color: var(--text-2); font-weight: 600; }
.field label .req { color: var(--brand); }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 15px; padding: 12px 14px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--paper); color: var(--text); transition: border-color .25s, box-shadow .25s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.field textarea { resize: vertical; min-height: 96px; }
.form-note { font-size: 13px; color: var(--text-3); }
.form-result { margin-top: 14px; padding: 14px 16px; border-radius: 10px; font-size: 14px; display: none; }
.form-result.ok { display: block; background: #E7F6EC; color: #1E7A43; border: 1px solid #BFE6CB; }
.form-result.err { display: block; background: #FDECEC; color: #B3261E; border: 1px solid #F5C4C0; }

/* ---------- 关于页时间线/关系 ---------- */
.relation { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
.relation__item { text-align: center; padding: 28px 20px; border-radius: var(--radius); background: var(--bg); }
.relation__item .badge { width: 64px; height: 64px; border-radius: 16px; margin: 0 auto 16px; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 26px; }
.relation__item h4 { font-size: 17px; color: var(--ink); margin-bottom: 6px; }
.relation__item p { font-size: 13.5px; color: var(--text-2); margin: 0; }

/* 集团关系徽章 */
.group-badge { display: inline-flex; align-items: center; gap: 12px; background: rgba(255,255,255,.06); border: 1px solid var(--line-dark); border-radius: 999px; padding: 10px 20px; color: #EAF0F6; font-size: 14px; }
.group-badge .shield { width: 26px; height: 26px; border-radius: 50%; background: var(--brand); display: grid; place-items: center; color: #fff; font-size: 13px; font-weight: 900; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--ink); color: #C6D2DE; padding: 64px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 44px; }
.footer-brand .brand { color: #fff; margin-bottom: 18px; }
.footer-brand p { font-size: 14px; color: #93A4B5; line-height: 1.8; max-width: 36ch; }
.footer-col h5 { color: #fff; font-size: 15px; margin: 0 0 18px; letter-spacing: 1px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 11px; }
.footer-col a { color: #A9B8C7; font-size: 14px; transition: color .25s; }
.footer-col a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; color: #A9B8C7; font-size: 14px; }
.footer-contact .ico { color: var(--brand); flex: none; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 22px 0; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; font-size: 13px; color: #7E90A2; }
.footer-bottom a { color: #9FB0C0; }
.footer-bottom a:hover { color: #fff; }
.footer-extra { padding: 0 0 30px; font-size: 12.5px; color: #6E8094; line-height: 1.8; }

/* ---------- 面包屑 / 内页头 ---------- */
.page-hero { background: var(--ink); color: #fff; padding: 130px 0 70px; position: relative; overflow: hidden; background-size: cover; background-position: center center; }
.page-hero::before { content:""; position:absolute; inset:0; background: radial-gradient(120% 90% at 85% 0%, rgba(198,40,40,.22), transparent 55%); }
.page-hero__overlay { position:absolute; inset:0; background: linear-gradient(135deg, rgba(8,16,26,.82) 0%, rgba(8,16,26,.50) 60%, rgba(8,16,26,.30) 100%); }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(30px,4.4vw,52px); letter-spacing: 2px; }
.page-hero p { color: #C2CFDB; max-width: 64ch; margin: 16px 0 0; font-size: 17px; }

/* ---------- 照片网格（关于页实景展示） ---------- */
.photo-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.photo-card { border-radius: var(--radius); overflow: hidden; background: var(--bg-2); box-shadow: var(--shadow); transition: transform .4s var(--ease), box-shadow .4s var(--ease); }
.photo-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.photo-card img { width: 100%; height: 260px; object-fit: cover; display: block; }
.photo-card figcaption { padding: 14px 18px; font-size: 14px; color: var(--text-2); font-weight: 600; text-align: center; }

/* ---------- 证书网格（资质荣誉） ---------- */
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.cert-card { border-radius: var(--radius); overflow: hidden; background: #fff; box-shadow: var(--shadow); transition: transform .4s var(--ease), box-shadow .4s var(--ease); border: 1px solid var(--line); }
.cert-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.cert-card img { width: 100%; height: 200px; object-fit: contain; background: #FFFBF0; display: block; padding: 12px; }
.cert-card figcaption { padding: 12px 14px; font-size: 13px; color: var(--text-2); text-align: center; line-height: 1.5; }
.breadcrumb { font-size: 13px; color: #8FA3B5; margin-bottom: 18px; letter-spacing: 1px; }
.breadcrumb a { color: #8FA3B5; }
.breadcrumb a:hover { color: #fff; }

/* 占位标签 */
.tag-ph { display: inline-block; font-size: 11px; padding: 2px 9px; border-radius: 999px; background: #FFF3CD; color: #8A6D1B; border: 1px solid #F0DCA0; letter-spacing: 1px; }

/* 回到顶部 */
.to-top { position: fixed; right: 22px; bottom: 22px; width: 48px; height: 48px; border-radius: 50%; background: var(--brand); color: #fff; border: none; cursor: pointer; display: grid; place-items: center; font-size: 20px; box-shadow: 0 10px 24px rgba(198,40,40,.4); opacity: 0; pointer-events: none; transform: translateY(12px); transition: .35s var(--ease); z-index: 900; }
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }
.to-top:hover { background: var(--brand-dark); }

/* 移动导航面板 */
.mobile-nav { position: fixed; inset: 0; background: var(--ink); z-index: 1100; padding: 100px 28px 40px; transform: translateX(100%); transition: transform .4s var(--ease); display: flex; flex-direction: column; gap: 6px; }
.mobile-nav.open { transform: none; }
.mobile-nav a { color: #E7EDF3; font-size: 20px; font-weight: 700; padding: 16px 4px; border-bottom: 1px solid rgba(255,255,255,.08); }
.mobile-nav a.active { color: #FF8A8A; }
.mobile-nav .btn { margin-top: 24px; }
.mobile-nav__close { position: absolute; top: 26px; right: 24px; width: 44px; height: 44px; border: none; background: transparent; color: #fff; font-size: 30px; cursor: pointer; }

/* ============ 动效关键帧 ============ */
@keyframes fadeUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: none; } }
@keyframes heroZoom { from { transform: scale(1.12); } to { transform: scale(1); } }

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .stats-band__grid { grid-template-columns: repeat(3, 1fr); }
  .grid--3, .grid--4, .why { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .region { grid-template-columns: 1fr; gap: 36px; }
  .relation { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 38px; }
  .nav__links, .nav__cta .btn, .nav__phone { display: none; }
  .nav__toggle { display: block; }
  .grid--2, .grid--3, .grid--4, .why, .flow, .contact-grid, .form-grid, .stats-band__grid, .footer-grid, .photo-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: clamp(30px, 9vw, 46px); }
  .hero__inner { padding: 110px 0 80px; }
  .hero-strip__item { border-right: none; border-bottom: 1px solid rgba(255,255,255,.08); }
  .cta-band { padding: 40px 24px; }
  .page-hero { padding: 110px 0 50px; }
}

/* ---------- 内页通用组件 ---------- */
.meta-list { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 11px; }
.meta-list li { position: relative; padding-left: 20px; font-size: 15px; color: var(--text-2); line-height: 1.65; }
.meta-list li::before { content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; border-radius: 50%; background: var(--brand); }
.meta-list b { color: var(--text); }

.ind-block { display: grid; grid-template-columns: 320px 1fr; gap: 40px; align-items: center; padding: 44px 0; border-bottom: 1px solid var(--line); }
.ind-block:last-of-type { border-bottom: none; }
.ind-block__media { height: 230px; border-radius: var(--radius-lg); background: linear-gradient(160deg,#1a2b3d,#0c1622); display: grid; place-items: center; color: #5d7286; font-size: 52px; box-shadow: var(--shadow); }
.ind-block h3 { font-size: 26px; color: var(--ink); margin: 8px 0 12px; }
.ind-block p { color: var(--text-2); font-size: 15.5px; line-height: 1.8; }

.contact-info { display: grid; gap: 13px; margin-top: 14px; }
.ci-item { display: flex; gap: 13px; font-size: 15px; align-items: flex-start; }
.ci-ic { color: var(--brand); font-size: 17px; line-height: 1.4; }
.ci-item b { display: block; color: var(--text-3); font-size: 12px; font-weight: 600; letter-spacing: .5px; margin-bottom: 2px; }
.ci-item span { color: var(--text); font-weight: 600; }

.placeholder-note { background: #FFF8E6; border: 1px solid #F0DCA0; color: #8A6D1B; padding: 15px 20px; border-radius: 12px; font-size: 14.5px; line-height: 1.7; }
.ph-box { background: var(--bg-2); border: 1px dashed var(--line); border-radius: var(--radius); display: grid; place-items: center; color: var(--text-3); min-height: 170px; font-size: 14px; letter-spacing: 1px; }
.note-soft { font-size: 13.5px; color: var(--text-3); line-height: 1.7; }
.section-head + .placeholder-note { max-width: 820px; margin: 0 auto; }

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 860px) {
  .ind-block { grid-template-columns: 1fr; gap: 20px; padding: 32px 0; }
  .ind-block__media { height: 170px; font-size: 40px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ============ 尊重"减少动态效果"系统设置 ============ */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .hero__bg { animation: none; }
  .map-line { stroke-dashoffset: 0 !important; }
  .hero__eyebrow, .hero h1, .hero__sub, .hero__actions { opacity: 1 !important; animation: none !important; }
}