/* INTOINT 官网样式 —— 简约科技风，主色深蓝 */
:root {
  --blue: #0A3D8F;
  --blue-2: #1E6FD9;
  --navy: #0A1F44;
  --navy-2: #0F2A5A;
  --green: #3AAA35;
  --green-light: #4CC13F;
  --ink: #1A2233;
  --ink-2: #4A5568;
  --ink-3: #7A8699;
  --line: #E3E8EF;
  --bg: #FFFFFF;
  --bg-soft: #F4F7FB;
  --radius: 6px;
  --max: 1440px;
  --header-h: 80px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg); line-height: 1.7; font-size: 16px; }
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-2); }
h1, h2, h3, h4 { line-height: 1.3; margin: 0 0 .6em; font-weight: 700; color: var(--ink); }
p { margin: 0 0 1em; }
ul { margin: 0; padding: 0; list-style: none; }

/* 中英文切换 */
html[lang="en"] .zh { display: none !important; }
html:not([lang="en"]) .en { display: none !important; }

.container { max-width: var(--max); margin: 0 auto; padding-left: max(40px, env(safe-area-inset-left, 0px)); padding-right: max(40px, env(safe-area-inset-right, 0px)); }
.section { padding: 128px 0; }
.section.soft { background: var(--bg-soft); }
.section.dark { background: var(--navy); color: #C9D4E5; }
.section.dark h2, .section.dark h3 { color: #fff; }

.eyebrow { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--blue-2); margin-bottom: 14px; }
.eyebrow::before { content: ""; width: 4px; height: 16px; background: var(--green); }
.dark .eyebrow { color: #7FB0F5; }
.section-head { max-width: 860px; margin-bottom: 64px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-head.center .eyebrow { justify-content: center; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 48px); letter-spacing: .01em; }
.section-head p { color: var(--ink-2); font-size: 18px; }
.dark .section-head p { color: #A9B7CC; }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 13px 28px; border-radius: var(--radius); font-weight: 600; font-size: 15px; border: 1px solid transparent; transition: background .2s, color .2s, border-color .2s; cursor: pointer; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-2); color: #fff; }
.btn-ghost { border-color: rgba(255,255,255,.55); color: #fff; }
.btn-ghost:hover { background: #fff; color: var(--blue); }
.btn-outline { border-color: var(--blue); color: var(--blue); }
.btn-outline:hover { background: var(--blue); color: #fff; }
.arrow::after { content: "→"; transition: transform .2s; }
a:hover .arrow::after, .btn:hover.arrow::after { transform: translateX(3px); }

/* 顶部导航 */
.site-header { position: fixed; inset: 0 0 auto 0; height: var(--header-h); z-index: 100; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); backdrop-filter: saturate(1.4) blur(8px); transition: background .35s, border-color .35s, box-shadow .35s, height .35s; }
body.scrolled .site-header { box-shadow: 0 6px 24px rgba(10,31,68,.08); }
/* 首页顶部透明导航 */
body.home:not(.scrolled):not(.menu-open) .site-header { background: transparent; border-color: rgba(255,255,255,.12); backdrop-filter: none; }
body.home:not(.scrolled):not(.menu-open) .brand .logo-dark { display: none; }
body.home:not(.scrolled):not(.menu-open) .brand .logo-light { display: block; }
body.home:not(.scrolled):not(.menu-open) .nav a { color: rgba(255,255,255,.88); }
body.home:not(.scrolled):not(.menu-open) .nav a:hover, body.home:not(.scrolled):not(.menu-open) .nav a.active { color: #fff; }
body.home:not(.scrolled):not(.menu-open) .nav a.active::after { background: var(--green-light); }
body.home:not(.scrolled):not(.menu-open) .lang-toggle { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
body.home:not(.scrolled):not(.menu-open) .menu-btn span { background: #fff; }
body.home main { padding-top: 0; }
.site-header .container { height: 100%; display: flex; align-items: center; gap: 32px; }
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand img { height: 32px; width: auto; }
.brand .logo-light { display: none; }
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a { color: var(--ink); font-size: 15.5px; font-weight: 500; padding: 8px 18px; transition: color .2s; border-radius: 4px; position: relative; }
.nav a:hover { color: var(--blue); }
.nav a.active { color: var(--blue); }
.nav a::after { content: ""; position: absolute; left: 18px; right: 18px; bottom: -18px; height: 3px; background: var(--blue); transform: scaleX(0); transition: transform .25s; }
.nav a.active::after, .nav a:hover::after { transform: scaleX(1); }
.header-tools { display: flex; align-items: center; gap: 12px; }
.lang-toggle { border: 1px solid var(--line); background: #fff; border-radius: 4px; padding: 6px 10px; font-size: 13px; font-weight: 600; color: var(--ink-2); cursor: pointer; font-family: inherit; }
.lang-toggle:hover { border-color: var(--blue); color: var(--blue); }
.header-phone { font-size: 14px; font-weight: 600; color: var(--blue); white-space: nowrap; }
.menu-btn { display: none; background: none; border: 0; width: 40px; height: 40px; cursor: pointer; padding: 8px; }
.menu-btn span { display: block; height: 2px; background: var(--ink); margin: 6px 0; transition: transform .2s, opacity .2s; }
body.menu-open .menu-btn span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
body.menu-open .menu-btn span:nth-child(2) { opacity: 0; }
body.menu-open .menu-btn span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

main { padding-top: var(--header-h); }

/* 首页大图 */
.hero { position: relative; min-height: 100vh; min-height: 100svh; display: flex; align-items: center; color: #fff; overflow: hidden; background: var(--navy); }
.hero-bg { position: absolute; inset: 0; background-size: cover; background-position: center; }
.hero > .hero-bg { animation: kenburns 24s ease-out both; }
@keyframes kenburns { from { transform: scale(1.12); } to { transform: scale(1); } }
.hero-bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(10,31,68,.94) 0%, rgba(10,31,68,.78) 45%, rgba(10,61,143,.35) 100%); }
.hero .container { position: relative; z-index: 1; width: 100%; padding-top: calc(var(--header-h) + 60px); padding-bottom: 120px; }
.hero h1 { color: #fff; font-size: clamp(38px, 6.2vw, 92px); max-width: 1100px; line-height: 1.15; margin-bottom: 24px; letter-spacing: .01em; }
.hero h1 em { font-style: normal; color: var(--green-light); }
.hero p.lead { font-size: clamp(16px, 1.5vw, 22px); color: #C9D4E5; max-width: 760px; margin-bottom: 40px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 16px; }
.hero-chain { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 64px; font-size: 14px; color: #A9B7CC; align-items: center; }
.hero-chain b { color: #fff; font-weight: 600; padding: 6px 14px; border: 1px solid rgba(255,255,255,.25); border-radius: 3px; background: rgba(255,255,255,.05); }
.hero-chain i { font-style: normal; color: var(--green-light); }

/* 子页标题 */
.page-hero { position: relative; padding: 150px 0 120px; color: #fff; background: var(--navy); overflow: hidden; }
.page-hero .hero-bg::after { background: linear-gradient(90deg, rgba(10,31,68,.95) 0%, rgba(10,31,68,.8) 55%, rgba(10,61,143,.5) 100%); }
.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { color: #fff; font-size: clamp(32px, 4.6vw, 64px); max-width: 1000px; margin-bottom: 16px; }
.page-hero p { color: #C9D4E5; font-size: 19px; max-width: 760px; margin: 0; }
.subnav { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: var(--header-h); z-index: 50; }
.subnav .container { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
.subnav .container::-webkit-scrollbar { display: none; }
.subnav a { padding: 18px 20px; color: var(--ink-2); font-size: 15px; white-space: nowrap; border-bottom: 2px solid transparent; transition: color .2s, border-color .2s; }
.subnav a.on { color: var(--blue); border-color: var(--blue); font-weight: 600; }
.subnav a:hover { color: var(--blue); border-color: var(--blue); }

/* 价值链 */
.chain { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; position: relative; }
.chain-step { padding: 52px 44px; background: #fff; border: 1px solid var(--line); position: relative; }
.chain-step + .chain-step { border-left: 0; }
.chain-step .num { font-size: 13px; font-weight: 700; color: var(--blue-2); letter-spacing: .1em; margin-bottom: 18px; display: block; }
.chain-step h3 { font-size: 22px; margin-bottom: 4px; }
.chain-step .sub { color: var(--ink-3); font-size: 14px; margin-bottom: 18px; display: block; }
.chain-step p { color: var(--ink-2); font-size: 15px; margin: 0; }
.chain-step:not(:last-child)::after { content: ""; position: absolute; right: -14px; top: 50%; width: 26px; height: 26px; margin-top: -13px; background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2.5'%3E%3Cpath d='M9 6l6 6-6 6'/%3E%3C/svg%3E") center/14px no-repeat; border-radius: 50%; z-index: 2; }
.chain-step.hl { background: var(--blue); border-color: var(--blue); }
.chain-step.hl h3, .chain-step.hl .num { color: #fff; }
.chain-step.hl .sub, .chain-step.hl p { color: #C9D8F0; }
.chain-step.hl::after { background-color: var(--green); }
.chain-base { margin-top: 16px; padding: 20px 36px; border: 1px dashed #B8C4D6; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; color: var(--ink-2); font-size: 15px; background: #fff; }
.chain-base b { color: var(--ink); font-size: 16px; }

/* 业务卡片 */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; transition: box-shadow .25s, transform .25s; color: inherit; }
a.card:hover { box-shadow: 0 16px 40px rgba(10,31,68,.12); transform: translateY(-4px); color: inherit; }
.card-img { aspect-ratio: 4/3; background-size: cover; background-position: center; background-color: var(--bg-soft); }
.card-body { padding: 24px 24px 28px; display: flex; flex-direction: column; flex: 1; }
.card-body h3 { font-size: 19px; margin-bottom: 10px; }
.card-body p { color: var(--ink-2); font-size: 14.5px; flex: 1; }
.card-body .more { color: var(--blue); font-weight: 600; font-size: 14px; }
.tag { display: inline-block; font-size: 12px; font-weight: 600; color: var(--blue); background: #EAF1FC; padding: 3px 10px; border-radius: 3px; margin: 0 6px 10px 0; }
.tag.green { color: #23801F; background: #E8F6E7; }

/* 图文分栏 */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 96px; align-items: center; }
.split.rev .split-media { order: 2; }
.split-media img { width: 100%; border-radius: var(--radius); aspect-ratio: 4/3; object-fit: cover; }
.split-text h2 { font-size: clamp(26px, 3vw, 42px); }
.split-text h3 { font-size: 24px; }
.split-text > p { color: var(--ink-2); }
.dark .split-text > p { color: #A9B7CC; }
.checklist li { position: relative; padding-left: 28px; margin-bottom: 12px; color: var(--ink-2); }
.checklist li::before { content: ""; position: absolute; left: 0; top: 9px; width: 14px; height: 8px; border-left: 2px solid var(--green); border-bottom: 2px solid var(--green); transform: rotate(-45deg); }
.dark .checklist li { color: #C9D4E5; }
.checklist li b { color: var(--ink); }
.dark .checklist li b { color: #fff; }

/* 数字孪生看板示意 */
.twin-board { background: #071733; border: 1px solid #1D3A6B; border-radius: 8px; padding: 18px; font-size: 12px; color: #8FA6C8; box-shadow: 0 30px 60px rgba(0,0,0,.35); }
.twin-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; gap: 10px; flex-wrap: wrap; }
.twin-top .title { color: #fff; font-weight: 600; font-size: 13px; }
.twin-tabs { display: flex; gap: 4px; }
.twin-tabs span { padding: 3px 10px; border: 1px solid #1D3A6B; border-radius: 3px; }
.twin-tabs span.on { background: var(--blue-2); border-color: var(--blue-2); color: #fff; }
.twin-grid { display: grid; grid-template-columns: 1fr 2fr 1fr; gap: 10px; }
.twin-panel { background: #0B2149; border: 1px solid #16325F; border-radius: 4px; padding: 10px; }
.twin-panel .lbl { color: #6F89B0; font-size: 11px; margin-bottom: 6px; }
.kv { display: flex; justify-content: space-between; padding: 4px 0; border-bottom: 1px dashed #16325F; }
.kv:last-child { border: 0; }
.kv b { color: #E6EEFA; font-weight: 600; }
.kv b.ok { color: var(--green-light); }
.twin-flow { display: flex; align-items: center; justify-content: space-between; gap: 4px; margin: 8px 0 12px; }
.twin-flow span { flex: 1; text-align: center; padding: 8px 2px; background: #10305F; border: 1px solid #1E4A8A; border-radius: 3px; color: #CFE0F7; font-size: 11px; }
.twin-flow span.a { background: #12417F; }
.twin-flow i { color: var(--green-light); font-style: normal; }
.twin-board svg { width: 100%; height: auto; display: block; }

/* 行业 */
.industries { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.industry { position: relative; border-radius: var(--radius); overflow: hidden; min-height: 460px; display: flex; align-items: flex-end; color: #fff; }
.industry .bg { position: absolute; inset: 0; background-size: cover; background-position: center; transition: transform .5s; }
.industry::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(10,31,68,.05) 20%, rgba(10,31,68,.92) 100%); }
.industry:hover .bg { transform: scale(1.05); }
.industry .txt { position: relative; z-index: 1; padding: 28px; }
.industry h3 { color: #fff; font-size: 22px; margin-bottom: 8px; }
.industry p { color: #C9D4E5; font-size: 14.5px; margin: 0; }
.industry .cat { font-size: 12px; color: var(--green-light); letter-spacing: .1em; font-weight: 600; display: block; margin-bottom: 6px; }

/* 优势 */
.features { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature { padding: 36px 30px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.feature .ic { width: 44px; height: 44px; border-radius: 8px; background: #EAF1FC; display: grid; place-items: center; margin-bottom: 20px; }
.feature .ic svg { width: 24px; height: 24px; stroke: var(--blue); }
.feature h3 { font-size: 18px; }
.feature p { color: var(--ink-2); font-size: 14.5px; margin: 0; }

/* 案例 */
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 40px; }
.filters button { font-family: inherit; font-size: 14px; padding: 8px 18px; border: 1px solid var(--line); background: #fff; border-radius: 20px; cursor: pointer; color: var(--ink-2); }
.filters button:hover { border-color: var(--blue); color: var(--blue); }
.filters button.on { background: var(--blue); border-color: var(--blue); color: #fff; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.case { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; display: flex; flex-direction: column; }
.case[hidden] { display: none; }
.case .card-img { aspect-ratio: 16/10; }
.case-body { padding: 22px 24px 26px; }
.case-body h3 { font-size: 18px; margin-bottom: 10px; }
.case-body p { color: var(--ink-2); font-size: 14.5px; margin-bottom: 14px; }
.case-body ul li { font-size: 13.5px; color: var(--ink-3); padding-left: 14px; position: relative; margin-bottom: 4px; }
.case-body ul li::before { content: ""; position: absolute; left: 0; top: 10px; width: 5px; height: 5px; background: var(--blue-2); }
.case-thumbs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; }
.case-thumbs div { aspect-ratio: 4/3; background-size: cover; background-position: center; }
.case-art { aspect-ratio: 16/10; background: var(--navy); display: grid; place-items: center; padding: 18px; }
.case-art .twin-board { box-shadow: none; padding: 10px; transform: scale(.98); width: 100%; }

/* 流程 */
.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; counter-reset: s; }
.step { padding: 24px 20px; border-top: 3px solid var(--blue); background: #fff; }
.step::before { counter-increment: s; content: "0" counter(s); display: block; font-size: 28px; font-weight: 700; color: #D4DEEC; margin-bottom: 8px; }
.step h4 { font-size: 16px; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--ink-2); margin: 0; }

/* 架构图 */
.layers { display: grid; gap: 8px; }
.layer { display: grid; grid-template-columns: 140px 1fr; align-items: stretch; border: 1px solid #1D3A6B; border-radius: 4px; overflow: hidden; }
.layer .ln { background: #12346B; color: #fff; font-weight: 600; font-size: 14px; padding: 14px; display: flex; align-items: center; }
.layer .lc { padding: 14px 18px; font-size: 14px; color: #C9D4E5; background: #0B2149; display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; }
.layer.core .ln { background: var(--green); }
.layer.core { border-color: var(--green); }

/* CTA */
.cta { background: linear-gradient(120deg, var(--blue) 0%, var(--navy) 100%); color: #fff; padding: 96px 0; }
.cta .container { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; }
.cta h2 { color: #fff; font-size: clamp(22px, 2.6vw, 32px); margin-bottom: 8px; }
.cta p { color: #C9D8F0; margin: 0; }
.cta .phone-big { font-size: clamp(24px, 3vw, 34px); font-weight: 700; color: #fff; letter-spacing: .03em; display: block; margin-bottom: 10px; }

/* 联系 */
.contact-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; }
.contact-item { display: flex; gap: 18px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.contact-item .ic { width: 48px; height: 48px; border-radius: 50%; background: #EAF1FC; display: grid; place-items: center; flex-shrink: 0; }
.contact-item .ic svg { width: 22px; height: 22px; stroke: var(--blue); }
.contact-item .k { font-size: 13px; color: var(--ink-3); margin-bottom: 2px; }
.contact-item .v { font-size: 20px; font-weight: 600; color: var(--ink); }
.contact-panel { background: var(--bg-soft); border-radius: var(--radius); padding: 36px; }
.contact-panel h3 { font-size: 20px; }
.social-list { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.social-list a { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: #fff; padding: 10px 16px; border-radius: 4px; color: var(--ink); font-size: 14px; }
.social-list a:hover { border-color: var(--blue); color: var(--blue); }
.qr-list { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 18px; }
.qr-list figure { margin: 0; text-align: center; font-size: 13px; color: var(--ink-2); }
.qr-list img { width: 120px; height: 120px; border: 1px solid var(--line); padding: 6px; background: #fff; margin-bottom: 6px; }

/* 关于 */
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 40px; }
.stat { border-left: 3px solid var(--blue); padding: 6px 0 6px 18px; }
.stat b { display: block; font-size: 20px; color: var(--ink); margin-bottom: 4px; }
.stat span { font-size: 14px; color: var(--ink-2); }

/* 页脚 */
.site-footer { background: #071733; color: #8FA6C8; font-size: 14px; padding: 64px 0 0; }
.footer-top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 48px; }
.footer-brand img { height: 30px; width: auto; margin-bottom: 18px; }
.footer-brand p { color: #8FA6C8; max-width: 320px; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; font-weight: 600; }
.site-footer li { margin-bottom: 10px; }
.site-footer a { color: #8FA6C8; }
.site-footer a:hover { color: #fff; }
.footer-phone { font-size: 22px; font-weight: 700; color: #fff !important; display: block; margin-bottom: 6px; }
.footer-social { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.footer-social a { border: 1px solid #1D3A6B; padding: 6px 12px; border-radius: 3px; font-size: 13px; }
.footer-bottom { border-top: 1px solid #13284F; padding: 22px 0; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; font-size: 13px; color: #5F769A; }
.footer-bottom a { color: #5F769A; }

/* 响应式 */
@media (max-width: 1080px) {
  .split { gap: 56px; }
  .container { padding-left: max(24px, env(safe-area-inset-left, 0px)); padding-right: max(24px, env(safe-area-inset-right, 0px)); }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .features { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .header-phone { display: none; }
}
@media (max-width: 900px) {
  :root { --header-h: 64px; }
  .menu-btn { display: block; }
  .nav { position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0; background: #fff; flex-direction: column; padding: 16px 24px; gap: 0; transform: translateX(100%); transition: transform .25s; overflow-y: auto; }
  body.menu-open .nav { transform: none; }
  .nav a { padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 17px; }
  .nav a::after { display: none; }
  .header-tools { margin-left: auto; }
  .nav + .header-tools { margin-left: 0; }
  .section { padding: 72px 0; }
  .industry { min-height: 340px; }
  .page-hero { padding: 110px 0 80px; }
  .chain { grid-template-columns: 1fr; }
  .chain-step + .chain-step { border-left: 1px solid var(--line); border-top: 0; }
  .chain-step.hl + .chain-step { border-top: 0; }
  .chain-step:not(:last-child)::after { right: 50%; top: auto; bottom: -14px; margin: 0 -13px 0 0; transform: rotate(90deg); }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split.rev .split-media { order: 0; }
  .industries, .case-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .twin-grid { grid-template-columns: 1fr 1fr; }
  .twin-grid .twin-panel.mid { grid-column: 1 / -1; order: -1; }
  .layer { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .container { padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
  .cards, .features, .industries, .case-grid, .footer-top { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .hero-chain { margin-top: 40px; }
  .chain-step, .chain-base { padding: 28px 22px; }
  .page-hero { padding: 80px 0 56px; }
  .hero .container { padding-bottom: 72px; }
  .brand img { height: 26px; }
  .industry { min-height: 260px; }
}

/* 数字孪生演示页 */
.demo-stage { background: var(--navy); border-radius: var(--radius); padding: 24px; }
.demo-stage iframe { width: 100%; border: 0; display: block; background: #fff; border-radius: 4px; }
.demo-note { margin-top: 18px; font-size: 14px; color: var(--ink-3); }
.case-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.case-actions .btn { padding: 9px 18px; font-size: 14px; }
.case-art .twin-grid { grid-template-columns: 1fr; }
.case-art .twin-panel:not(.mid) { display: none; }
.case-art .twin-grid .twin-panel.mid { order: 0; }

/* 交互动效 */
.hero .eyebrow, .hero h1, .hero p.lead, .hero .actions, .hero-chain { animation: rise .9s cubic-bezier(.2,.7,.2,1) both; }
.hero h1 { animation-delay: .12s; }
.hero p.lead { animation-delay: .24s; }
.hero .actions { animation-delay: .36s; }
.hero-chain { animation-delay: .5s; }
@keyframes rise { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: none; } }
.scroll-cue { position: absolute; left: 50%; bottom: 28px; z-index: 1; width: 26px; height: 42px; margin-left: -13px; border: 2px solid rgba(255,255,255,.5); border-radius: 14px; }
.scroll-cue::after { content: ""; position: absolute; left: 50%; top: 8px; width: 4px; height: 8px; margin-left: -2px; border-radius: 2px; background: #fff; animation: cue 1.8s ease-in-out infinite; }
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 30% { opacity: 1; } 100% { opacity: 0; transform: translateY(14px); } }

html.reveal-on .rv { opacity: 0; transform: translateY(36px); transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1); transition-delay: var(--d, 0s); }
html.reveal-on .rv.in { opacity: 1; transform: none; }

.card-img, .case .card-img, .case-thumbs div, .split-media img { transition: transform .6s cubic-bezier(.2,.7,.2,1); }
.card, .case, .split-media { overflow: hidden; }
a.card:hover .card-img, .case:hover .card-img, .case:hover .case-thumbs div { transform: scale(1.06); }
.split-media { border-radius: var(--radius); }
.split-media:hover img { transform: scale(1.04); }
.case { transition: box-shadow .25s, transform .25s; }
.case:hover { box-shadow: 0 16px 40px rgba(10,31,68,.12); transform: translateY(-4px); }
.feature { transition: background .25s; }
.feature:hover { background: #F7FAFF; }
.feature .ic { transition: background .25s, transform .25s; }
.feature:hover .ic { background: var(--blue); transform: translateY(-3px); }
.feature:hover .ic svg { stroke: #fff; }
.btn { transition: background .2s, color .2s, border-color .2s, transform .2s, box-shadow .2s; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(10,61,143,.3); }

.twin-board polyline.fc { stroke-dashoffset: 0; animation: dash 1.2s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -18; } }
.twin-board circle.now { animation: pulse 2s ease-in-out infinite; transform-origin: 180px 48px; }
@keyframes pulse { 50% { r: 6; opacity: .6; } }
.twin-tabs span { cursor: pointer; transition: background .2s, border-color .2s, color .2s; }
.twin-board .kv b { transition: color .3s; }
.twin-board .kv b.flash { color: #fff; }

.to-top { position: fixed; right: max(24px, env(safe-area-inset-right, 0px)); bottom: max(24px, env(safe-area-inset-bottom, 0px)); width: 46px; height: 46px; border-radius: 50%; border: 0; background: var(--blue); color: #fff; cursor: pointer; z-index: 90; display: grid; place-items: center; opacity: 0; transform: translateY(16px); pointer-events: none; transition: opacity .3s, transform .3s, background .2s; box-shadow: 0 8px 20px rgba(10,31,68,.25); }
.to-top svg { width: 22px; height: 22px; }
.to-top:hover { background: var(--blue-2); }
body.scrolled-far .to-top { opacity: 1; transform: none; pointer-events: auto; }
.scroll-progress { position: fixed; left: 0; top: 0; height: 3px; width: 100%; background: var(--green); transform-origin: 0 50%; transform: scaleX(0); z-index: 101; }

:focus-visible { outline: 2px solid var(--blue-2); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-on .rv { opacity: 1; transform: none; }
}

/* 智能客服 */
.chat { position: fixed; right: max(24px, env(safe-area-inset-right, 0px)); bottom: max(24px, env(safe-area-inset-bottom, 0px)); z-index: 120; display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
.chat-fab { display: inline-flex; align-items: center; gap: 8px; height: 52px; padding: 0 22px 0 18px; border: 0; border-radius: 26px; background: var(--blue); color: #fff; font: 600 15px var(--font); cursor: pointer; box-shadow: 0 10px 28px rgba(10,61,143,.35); transition: background .2s, transform .2s; }
.chat-fab:hover { background: var(--blue-2); transform: translateY(-2px); }
.chat-fab svg { width: 22px; height: 22px; }
.chat.open .chat-fab { background: var(--navy); }
.chat-panel { width: min(380px, calc(100vw - 32px)); height: min(560px, calc(100vh - 140px)); background: #fff; border-radius: 10px; box-shadow: 0 24px 60px rgba(10,31,68,.28); display: flex; flex-direction: column; overflow: hidden; order: -1; animation: rise .3s cubic-bezier(.2,.7,.2,1); }
.chat-head { background: var(--navy); color: #fff; padding: 16px 18px; display: flex; justify-content: space-between; align-items: center; }
.chat-head b { display: block; font-size: 15px; }
.chat-head small { color: #8FA6C8; font-size: 12px; }
.chat-close { background: none; border: 0; color: #fff; font-size: 26px; line-height: 1; cursor: pointer; padding: 0 4px; }
.chat-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; background: var(--bg-soft); }
.chat-msg { max-width: 86%; padding: 10px 14px; border-radius: 10px; font-size: 14px; line-height: 1.6; }
.chat-msg.bot { background: #fff; border: 1px solid var(--line); align-self: flex-start; border-top-left-radius: 2px; }
.chat-msg.me { background: var(--blue); color: #fff; align-self: flex-end; border-top-right-radius: 2px; }
.chat-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chat-chips button { font: 14px var(--font); padding: 7px 14px; border-radius: 16px; border: 1px solid var(--blue); background: #fff; color: var(--blue); cursor: pointer; }
.chat-chips button:hover { background: var(--blue); color: #fff; }
.chat-form { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 14px; display: grid; gap: 6px; }
.chat-form label { font-size: 12px; color: var(--ink-3); }
.chat-form input, .chat-form textarea { font: 14px var(--font); padding: 8px 10px; border: 1px solid var(--line); border-radius: 4px; width: 100%; }
.chat-form input:focus, .chat-form textarea:focus { outline: none; border-color: var(--blue-2); }
.chat-form .btn { margin-top: 6px; justify-content: center; }
.chat-embed .chat-body { padding: 0; }
.chat-embed iframe { width: 100%; height: 100%; border: 0; }
.to-top { bottom: calc(max(24px, env(safe-area-inset-bottom, 0px)) + 68px); }
@media (max-width: 600px) {
  .chat-fab-label { display: none; }
  .chat-fab { width: 52px; padding: 0; justify-content: center; }
  .chat-panel { height: calc(100vh - 120px); }
}

/* 导航报价按钮 */
.header-cta { padding: 9px 20px; font-size: 14px; }
body.home:not(.scrolled):not(.menu-open) .header-cta { background: var(--green); }
body.home:not(.scrolled):not(.menu-open) .header-cta:hover { background: var(--green-light); }
@media (max-width: 1180px) { .header-cta { display: none; } }

/* 询价向导 */
.quote-wrap { display: grid; grid-template-columns: 1.6fr 1fr; gap: 64px; align-items: start; }
.quote { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 40px; box-shadow: 0 20px 50px rgba(10,31,68,.06); min-width: 0; }
.q-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; list-style: none; padding: 0; margin: 0 0 36px; counter-reset: q; }
.q-steps li { font-size: 13px; color: var(--ink-3); padding-top: 12px; border-top: 3px solid var(--line); transition: border-color .3s, color .3s; }
.q-steps li::before { counter-increment: q; content: counter(q) ". "; }
.q-steps li.on { border-color: var(--blue); color: var(--blue); font-weight: 600; }
.q-step { border: 0; padding: 0; margin: 0; animation: rise .4s cubic-bezier(.2,.7,.2,1); }
.q-step legend { font-size: 22px; font-weight: 700; margin-bottom: 22px; padding: 0; }
.opts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.opt { position: relative; cursor: pointer; }
.opt input { position: absolute; opacity: 0; }
.opt > span { display: block; padding: 16px 18px 16px 46px; border: 1px solid var(--line); border-radius: 6px; font-size: 15px; transition: border-color .2s, background .2s; position: relative; }
.opt > span::before { content: ""; position: absolute; left: 16px; top: 50%; width: 18px; height: 18px; margin-top: -9px; border: 2px solid #C3CEDD; border-radius: 50%; transition: all .2s; }
.opt input[type=checkbox] + span::before { border-radius: 4px; }
.opt:hover > span { border-color: var(--blue-2); }
.opt input:checked + span { border-color: var(--blue); background: #F2F7FF; color: var(--blue); font-weight: 600; }
.opt input:checked + span::before { border-color: var(--blue); background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3.5'%3E%3Cpath d='M5 12l5 5 9-10'/%3E%3C/svg%3E") center/12px no-repeat; }
.opt input:focus-visible + span { outline: 2px solid var(--blue-2); outline-offset: 2px; }
.quote input:not([type=radio]):not([type=checkbox]), .quote select, .quote textarea { width: 100%; font: 15px var(--font); padding: 12px 14px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); }
.quote input:focus, .quote select:focus, .quote textarea:focus { outline: none; border-color: var(--blue-2); box-shadow: 0 0 0 3px rgba(30,111,217,.12); }
.fl { display: block; font-size: 14px; color: var(--ink-2); margin: 18px 0 8px; }
.q-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.q-grid .full { grid-column: 1 / -1; }
.consent { display: flex; gap: 8px; align-items: flex-start; font-size: 13.5px; color: var(--ink-2); margin-top: 20px; line-height: 1.5; }
.consent input { margin-top: 3px; }
.q-nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 32px; }
.q-nav [data-q="next"], .q-nav [type=submit] { margin-left: auto; }
.q-error { color: #C62828; font-size: 14px; margin: 16px 0 0; }
.q-done { animation: rise .4s; }
.q-done.ok .q-fail, .q-done.fail .q-ok { display: none; }
.q-done h3 { font-size: 24px; }
.q-summary { white-space: pre-wrap; background: var(--bg-soft); padding: 18px; border-radius: 6px; font: 14px/1.7 var(--font); overflow-x: auto; }
.quote-side { position: sticky; top: calc(var(--header-h) + 32px); }
.quote-side h3 { font-size: 20px; margin-bottom: 20px; }
.q-flow { list-style: none; padding: 0; margin: 0 0 32px; counter-reset: f; }
.q-flow li { position: relative; padding: 0 0 24px 48px; color: var(--ink-2); font-size: 14.5px; }
.q-flow li::before { counter-increment: f; content: counter(f); position: absolute; left: 0; top: 0; width: 32px; height: 32px; border-radius: 50%; background: #EAF1FC; color: var(--blue); font-weight: 700; display: grid; place-items: center; }
.q-flow li:not(:last-child)::after { content: ""; position: absolute; left: 15px; top: 36px; bottom: 4px; width: 2px; background: var(--line); }
.q-flow b { display: block; color: var(--ink); font-size: 16px; margin-bottom: 2px; }
.side-contact { background: var(--navy); color: #A9B7CC; border-radius: 8px; padding: 26px; font-size: 14px; }
.side-contact a { color: #fff; display: block; }
.side-contact a[data-site="phone"] { font-size: 24px; font-weight: 700; margin: 6px 0; }
.hp { position: absolute !important; left: -9999px; width: 1px; height: 1px; opacity: 0; }

/* 隐私政策正文 */
.prose { max-width: 820px; }
.prose h3 { font-size: 19px; margin-top: 36px; }
.prose p { color: var(--ink-2); }

/* 智能客服增强 */
.chat-id { display: flex; align-items: center; gap: 12px; }
.chat-avatar { width: 36px; height: 36px; border-radius: 50%; background: #fff; display: grid; place-items: center; flex-shrink: 0; position: relative; }
.chat-avatar img { width: 22px; height: 22px; }
.chat-avatar::after { content: ""; position: absolute; right: 0; bottom: 0; width: 9px; height: 9px; border-radius: 50%; background: var(--green-light); border: 2px solid var(--navy); }
.chat-input { display: flex; gap: 8px; padding: 12px; border-top: 1px solid var(--line); background: #fff; }
.chat-input input { flex: 1; min-width: 0; font: 14px var(--font); padding: 10px 12px; border: 1px solid var(--line); border-radius: 20px; }
.chat-input input:focus { outline: none; border-color: var(--blue-2); }
.chat-input button { width: 40px; height: 40px; border-radius: 50%; border: 0; background: var(--blue); color: #fff; cursor: pointer; display: grid; place-items: center; flex-shrink: 0; }
.chat-input button svg { width: 18px; height: 18px; }
.chat-msg a { color: inherit; text-decoration: underline; }
.chat-msg.bot a { color: var(--blue); font-weight: 600; }
.chat-form .consent { margin-top: 6px; font-size: 12px; }
.dots { display: inline-flex; gap: 4px; padding: 4px 0; }
.dots i { width: 6px; height: 6px; border-radius: 50%; background: var(--ink-3); animation: blink 1.2s infinite; }
.dots i:nth-child(2) { animation-delay: .2s; }
.dots i:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }

/* 手机底部快捷栏 */
.mobile-bar { display: none; }
@media (max-width: 600px) {
  .mobile-bar { display: grid; grid-template-columns: 1fr 1fr 1.2fr; position: fixed; left: 0; right: 0; bottom: 0; z-index: 110; background: #fff; border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom, 0px); box-shadow: 0 -6px 20px rgba(10,31,68,.08); }
  .mobile-bar a, .mobile-bar button { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; height: 58px; font: 12px var(--font); color: var(--ink-2); background: none; border: 0; cursor: pointer; }
  .mobile-bar svg { width: 22px; height: 22px; }
  .mobile-bar .hl { background: var(--blue); color: #fff; }
  body { padding-bottom: 58px; }
  .chat-fab { display: none; }
  .chat { bottom: calc(70px + env(safe-area-inset-bottom, 0px)); right: 8px; }
  .chat-panel { height: calc(100vh - 150px); width: calc(100vw - 16px); }
  .to-top { bottom: calc(74px + env(safe-area-inset-bottom, 0px)); right: 12px; width: 40px; height: 40px; }
  .quote { padding: 24px 18px; }
  .quote-wrap { grid-template-columns: 1fr; gap: 40px; }
  .opts, .q-grid { grid-template-columns: 1fr; }
  .quote-side { position: static; }
}
@media (max-width: 900px) and (min-width: 601px) {
  .quote-wrap { grid-template-columns: 1fr; }
  .quote-side { position: static; }
}