/* ==========================================================
   广捷云讯 企业门户 · 设计系统 v3
   深色沉浸式 · 电影级基础设施视觉 · 克制蓝青光效
   ========================================================== */
:root {
  --bg: #060B14;            /* 主背景：近黑深海军蓝 */
  --bg-2: #0A1220;          /* 面板 */
  --bg-3: #0E1A2E;
  --line: rgba(148,180,210,.14);
  --line-soft: rgba(148,180,210,.08);
  --tx: #E8EEF6;
  --tx2: #9AAABF;           /* 次级文字 */
  --tx3: #5F7086;           /* 弱化文字 */
  --cy: #3AC8DC;            /* 蓝青强调 */
  --cy-deep: #1E93A6;
  --ff: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --w: 1240px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--ff);
  color: var(--tx);
  background: var(--bg);
  font-size: 15.5px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
.container { max-width: var(--w); margin: 0 auto; padding: 0 28px; }
.placeholder { color: var(--tx3); font-style: normal; }

/* ---------- 字体层级 ---------- */
h1, h2, h3, h4, h5 { font-weight: 700; line-height: 1.28; letter-spacing: .01em; }
.eyebrow {
  display: flex; align-items: center; gap: 12px;
  font-size: 12.5px; font-weight: 600; letter-spacing: .32em;
  color: var(--cy); text-transform: uppercase;
  margin-bottom: 18px;
}
.eyebrow::before { content: ""; width: 28px; height: 1px; background: var(--cy); }
.sec-title { font-size: clamp(27px, 3.1vw, 38px); color: var(--tx); }
.sec-desc { color: var(--tx2); margin-top: 14px; max-width: 760px; font-size: 15.5px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 13px 30px; border-radius: 3px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: 1px solid transparent;
  transition: all .22s ease; white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--cy); color: #04121C; }
.btn-primary:hover { background: #5BD6E6; }
.btn-ghost { border-color: rgba(255,255,255,.4); color: #fff; }
.btn-ghost:hover { border-color: var(--cy); color: var(--cy); }
.btn-lg { padding: 16px 40px; font-size: 15.5px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 22px 0; transition: background .35s, box-shadow .35s, padding .35s;
}
.nav.scrolled {
  background: rgba(6,11,20,.82); backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--line-soft); padding: 12px 0;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 11px; color: #fff; }
.logo-mark { display: flex; color: var(--cy); }
.logo-text { font-size: 20px; font-weight: 800; letter-spacing: .06em; display: flex; flex-direction: column; line-height: 1.05; }
.logo-text small { font-size: 9.5px; font-weight: 500; letter-spacing: .3em; opacity: .6; }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links > a, .nav-item > a { color: rgba(255,255,255,.78); font-size: 15px; font-weight: 500; position: relative; transition: color .25s; }
.nav-links > a:not(.nav-cta)::after, .nav-item > a::after {
  content: ""; position: absolute; left: 0; bottom: -7px; width: 0; height: 2px;
  background: var(--cy); transition: width .25s;
}
.nav-links > a:not(.nav-cta):hover::after, .nav-item > a:hover::after { width: 100%; }
.nav-links a.active:not(.nav-cta) { color: var(--cy); }
.nav-links a.active::after { width: 100%; }
.nav-cta { padding: 10px 24px !important; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: #fff; border-radius: 2px; transition: all .3s; }
/* 下拉 */
.nav-item { position: relative; }
.dropdown-menu {
  position: absolute; top: calc(100% + 14px); left: 50%; transform: translateX(-50%) translateY(8px);
  background: rgba(10,18,32,.97); backdrop-filter: blur(16px);
  border: 1px solid var(--line); border-top: 2px solid var(--cy);
  border-radius: 4px; box-shadow: 0 24px 60px rgba(0,0,0,.5);
  padding: 8px; min-width: 280px; opacity: 0; visibility: hidden;
  transition: all .25s ease; z-index: 110;
}
.nav-item:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.dropdown-menu a { display: block; padding: 11px 16px; border-radius: 3px; color: var(--tx) !important; transition: background .2s; }
.dropdown-menu a::after { display: none !important; }
.dropdown-menu a:hover { background: rgba(58,200,220,.08); }
.dropdown-menu a b { display: block; font-size: 14px; font-weight: 600; }
.dropdown-menu a small { display: block; color: var(--tx3); font-size: 12px; }

/* ---------- 首屏：电影级主视觉（居中式） ---------- */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; justify-content: center; text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: -12% 0;
  background: url("assets/img/hero-chip.jpg") center/cover no-repeat;
  will-change: transform;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background:
    radial-gradient(ellipse 70% 55% at 50% 30%, rgba(6,11,20,.5), transparent 70%),
    linear-gradient(180deg, rgba(6,11,20,.72) 0%, rgba(6,11,20,.24) 34%, rgba(6,11,20,.34) 62%, var(--bg) 100%);
}
.hero-content { position: relative; z-index: 2; padding: 120px 28px 0; max-width: 940px; }
.hero-brand {
  display: inline-flex; align-items: center; gap: 14px;
  color: #fff; font-size: 22px; font-weight: 800; letter-spacing: .1em;
  margin-bottom: 38px;
}
.hero-brand .logo-mark { color: var(--cy); }
.hero-brand small { display: block; font-size: 10px; letter-spacing: .4em; opacity: .55; font-weight: 500; }
.hero h1 {
  color: #fff; font-size: clamp(34px, 5.2vw, 62px); font-weight: 800;
  line-height: 1.22; letter-spacing: .02em;
}
.hero h1 em { font-style: normal; color: var(--cy); }
.hero-sub {
  color: rgba(255,255,255,.68); font-size: clamp(15px, 1.6vw, 17.5px);
  margin: 26px auto 44px; max-width: 640px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-scroll {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 10px;
  color: rgba(255,255,255,.45); font-size: 11px; letter-spacing: .3em;
}
.hero-scroll i {
  width: 1px; height: 44px; background: linear-gradient(rgba(255,255,255,.5), transparent);
  display: block; animation: drip 2.2s ease infinite;
}
@keyframes drip { 0% { transform: scaleY(0); transform-origin: top; } 55% { transform: scaleY(1); transform-origin: top; } 100% { transform: scaleY(0); transform-origin: bottom; } }

/* ---------- 数据条 ---------- */
.strip { border-top: 1px solid var(--line-soft); background: var(--bg); }
.strip-inner { display: flex; }
.strip .strip-item { flex: 1; padding: 34px 8px 34px 30px; border-left: 1px solid var(--line-soft); }
.strip .strip-item:first-child { border-left: none; padding-left: 0; }
.strip-item b { font-size: 32px; font-weight: 800; color: #fff; font-variant-numeric: tabular-nums; }
.strip-item b i { font-style: normal; color: var(--cy); font-size: 17px; margin-left: 3px; font-weight: 600; }
.strip-item span { display: block; color: var(--tx3); font-size: 13px; margin-top: 2px; }

/* ---------- 通用分区 ---------- */
.section { padding: 110px 0; position: relative; }
.sec-head { max-width: 780px; margin-bottom: 56px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-head.center .eyebrow { justify-content: center; }
.sec-head.center .sec-desc { margin-left: auto; margin-right: auto; }
.sec-head.center .eyebrow::before { display: none; }

/* ---------- 业务磁贴（横向延展深色平台布局） ---------- */
.tile-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.tile {
  position: relative; height: 300px; border-radius: 6px; overflow: hidden;
  border: 1px solid var(--line-soft); display: flex; align-items: flex-end;
  transition: border-color .25s, transform .25s;
}
.tile img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform .6s cubic-bezier(.2,.6,.2,1); filter: saturate(.9);
}
.tile::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(185deg, rgba(6,11,20,.1) 30%, rgba(6,11,20,.88) 86%);
}
.tile:hover { border-color: rgba(58,200,220,.45); transform: translateY(-4px); }
.tile:hover img { transform: scale(1.07); }
.tile-body { position: relative; z-index: 2; padding: 24px 26px; width: 100%; }
.tile-no { font-size: 12px; font-weight: 700; letter-spacing: .24em; color: var(--cy); display: block; margin-bottom: 8px; }
.tile-body b { display: block; color: #fff; font-size: 18.5px; font-weight: 650; margin-bottom: 5px; }
.tile-body span { display: block; color: var(--tx2); font-size: 13.5px; line-height: 1.6; }
.tile-go {
  position: absolute; top: 18px; right: 18px; z-index: 2;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,.25); display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,.7); transition: all .25s;
}
.tile-go svg { width: 15px; height: 15px; }
.tile:hover .tile-go { background: var(--cy); border-color: var(--cy); color: #04121C; }

/* ---------- 一体化能力：大视觉 + 协同点 ---------- */
.fusion-visual {
  position: relative; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--line-soft);
}
.fusion-visual img { width: 100%; display: block; }
.fusion-visual figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 20px 26px;
  background: linear-gradient(transparent, rgba(6,11,20,.9));
  color: var(--tx2); font-size: 12.5px; letter-spacing: .08em;
}
.fusion-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); border-radius: 6px; overflow: hidden; margin-top: -1px; }
.fusion-item { background: var(--bg-2); padding: 30px 26px; transition: background .22s; }
.fusion-item:hover { background: var(--bg-3); }
.fusion-item b { display: block; color: #fff; font-size: 16.5px; margin-bottom: 7px; }
.fusion-item b i { font-style: normal; color: var(--cy); font-size: 13px; margin-right: 9px; font-variant-numeric: tabular-nums; }
.fusion-item p { color: var(--tx2); font-size: 13.5px; line-height: 1.7; }

/* ---------- 沉浸式业务展示（全幅视差行） ---------- */
.imm {
  position: relative; min-height: 82vh; display: flex; align-items: center;
  overflow: hidden; border-top: 1px solid var(--line-soft);
}
.imm-bg { position: absolute; inset: -10% 0; background-size: cover; background-position: center; will-change: transform; }
.imm::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(78deg, rgba(6,11,20,.9) 6%, rgba(6,11,20,.55) 48%, rgba(6,11,20,.18) 85%);
}
.imm.alt::before { background: linear-gradient(282deg, rgba(6,11,20,.9) 6%, rgba(6,11,20,.55) 48%, rgba(6,11,20,.18) 85%); }
.imm-content { position: relative; z-index: 2; max-width: 560px; padding: 90px 0; }
.imm.alt .imm-content { margin-left: auto; }
.imm-no { font-size: 13px; font-weight: 700; letter-spacing: .3em; color: var(--cy); margin-bottom: 16px; }
.imm-content h3 { color: #fff; font-size: clamp(24px, 2.8vw, 34px); margin-bottom: 16px; }
.imm-content p { color: var(--tx2); font-size: 15px; margin-bottom: 12px; }
.imm-points { display: flex; flex-wrap: wrap; gap: 9px; margin: 18px 0 26px; }
.imm-points i {
  font-style: normal; font-size: 12.5px; padding: 6px 14px;
  border: 1px solid var(--line); border-radius: 2px; color: var(--tx2);
  background: rgba(6,11,20,.4);
}
.imm-link { display: inline-flex; align-items: center; gap: 8px; color: var(--cy); font-weight: 600; font-size: 15px; }
.imm-link svg { width: 16px; height: 16px; transition: transform .22s; }
.imm-link:hover svg { transform: translateX(5px); }

/* ---------- 技术平台 ---------- */
.plat-row { display: grid; grid-template-columns: 1fr 1.25fr; gap: 64px; align-items: center; padding: 56px 0; }
.plat-row + .plat-row { border-top: 1px solid var(--line-soft); }
.plat-row:nth-child(even) .plat-shot { order: -1; }
.plat-no { font-size: 12.5px; font-weight: 700; letter-spacing: .26em; color: var(--tx3); margin-bottom: 12px; }
.plat-info h3 { font-size: 23px; color: #fff; margin-bottom: 12px; }
.plat-info p { color: var(--tx2); font-size: 15px; margin-bottom: 16px; }
.plat-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.plat-chips i { font-style: normal; font-size: 12.5px; padding: 5px 13px; border: 1px solid var(--line); border-radius: 2px; color: var(--tx2); }
.plat-link { display: inline-flex; align-items: center; gap: 7px; color: var(--cy); font-weight: 600; font-size: 14.5px; }
.plat-link svg { width: 15px; height: 15px; transition: transform .22s; }
.plat-link:hover svg { transform: translateX(4px); }
.plat-shot {
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
  background: var(--bg-2); box-shadow: 0 34px 90px rgba(0,0,0,.55);
}
.plat-shot .bar { display: flex; gap: 6px; padding: 11px 15px; background: rgba(255,255,255,.04); border-bottom: 1px solid var(--line-soft); }
.plat-shot .bar i { width: 9px; height: 9px; border-radius: 50%; background: rgba(148,180,210,.25); }
.plat-shot img { width: 100%; }
.plat-shot figcaption { padding: 11px 17px; font-size: 12px; color: var(--tx3); border-top: 1px solid var(--line-soft); }

/* ---------- 解决方案行 ---------- */
.sol-rows { border-top: 1px solid var(--line-soft); }
.sol-row {
  display: grid; grid-template-columns: 90px 1fr auto; gap: 26px; align-items: center;
  padding: 30px 12px; border-bottom: 1px solid var(--line-soft);
  transition: background .22s, padding .22s;
}
.sol-row:hover { background: rgba(58,200,220,.05); padding-left: 24px; }
.sol-row .no { font-size: 14px; font-weight: 750; color: var(--tx3); font-variant-numeric: tabular-nums; }
.sol-row b { display: block; color: #fff; font-size: 18.5px; font-weight: 650; margin-bottom: 4px; }
.sol-row p { color: var(--tx2); font-size: 14px; max-width: 720px; }
.sol-row .go { width: 20px; height: 20px; color: var(--tx3); transition: all .22s; }
.sol-row:hover .go { color: var(--cy); transform: translateX(5px); }

/* ---------- 案例行 ---------- */
.case-row {
  display: grid; grid-template-columns: 240px 1fr auto; gap: 40px; align-items: center;
  padding: 42px 12px; border-bottom: 1px solid var(--line-soft); transition: background .22s;
}
.case-row:first-child { border-top: 1px solid var(--line-soft); }
.case-row:hover { background: rgba(58,200,220,.04); }
.case-row .metric b { display: block; font-size: 42px; font-weight: 800; color: #fff; line-height: 1; font-variant-numeric: tabular-nums; }
.case-row .metric b i { font-style: normal; font-size: 20px; color: var(--cy); }
.case-row .metric span { font-size: 13px; color: var(--tx3); display: block; margin-top: 6px; }
.case-row .tag { display: inline-block; font-size: 12px; letter-spacing: .14em; padding: 4px 13px; border: 1px solid var(--line); border-radius: 2px; color: var(--tx2); margin-bottom: 10px; }
.case-row h4 { font-size: 19px; color: #fff; margin-bottom: 8px; }
.case-row .case-desc { color: var(--tx2); font-size: 14px; max-width: 640px; }
.case-row .go { width: 20px; height: 20px; color: var(--tx3); transition: all .22s; }
.case-row:hover .go { color: var(--cy); transform: translateX(5px); }

/* ---------- 内页 Hero ---------- */
.page-hero {
  position: relative; min-height: 62vh; display: flex; align-items: flex-end;
  background: var(--bg) center/cover no-repeat;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(6,11,20,.7), rgba(6,11,20,.42) 45%, var(--bg) 100%);
}
.page-hero .container { position: relative; z-index: 2; padding-bottom: 56px; }
.breadcrumb { color: rgba(255,255,255,.5); font-size: 13px; }
.breadcrumb a { color: rgba(255,255,255,.75); }
.breadcrumb a:hover { color: var(--cy); }
.breadcrumb i { font-style: normal; margin: 0 9px; opacity: .45; }
.page-hero h1 { color: #fff; font-size: clamp(28px, 3.9vw, 46px); font-weight: 800; margin-top: 14px; }
.page-hero .page-sub { color: rgba(255,255,255,.66); margin-top: 16px; max-width: 740px; font-size: 15.5px; }

/* ---------- 图文分栏 ---------- */
.split { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: center; }
.split-reverse .split-text { order: 2; }
.kicker { font-size: 12.5px; font-weight: 600; letter-spacing: .3em; color: var(--cy); text-transform: uppercase; margin-bottom: 14px; }
.split-text h3 { font-size: clamp(22px, 2.4vw, 28px); color: #fff; margin-bottom: 16px; }
.split-text p { color: var(--tx2); font-size: 15px; margin-bottom: 13px; }
.frame { border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--bg-2); box-shadow: 0 28px 70px rgba(0,0,0,.5); }
.frame img { width: 100%; }
.frame figcaption { padding: 11px 18px; font-size: 12px; color: var(--tx3); border-top: 1px solid var(--line-soft); background: rgba(255,255,255,.03); }
.photo { border-radius: 6px; overflow: hidden; border: 1px solid var(--line-soft); }
.photo img { width: 100%; height: 100%; object-fit: cover; }
.photo-cap { font-size: 12.5px; color: var(--tx3); margin-top: 10px; letter-spacing: .06em; }

/* ---------- 流程步骤 ---------- */
.flow-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; counter-reset: flow; }
.flow-step { padding: 28px 22px; background: var(--bg-2); border: 1px solid var(--line-soft); border-top: 2px solid var(--tx3); transition: all .22s; }
.flow-step:hover { border-top-color: var(--cy); transform: translateY(-3px); }
.flow-step::before { counter-increment: flow; content: counter(flow, decimal-leading-zero); font-size: 22px; font-weight: 800; color: var(--tx3); display: block; margin-bottom: 10px; }
.flow-step h5 { font-size: 15.5px; color: #fff; margin-bottom: 5px; }
.flow-step p { font-size: 13px; color: var(--tx2); line-height: 1.65; }

/* ---------- 能力卡 ---------- */
.cap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); }
.cap-card { background: var(--bg-2); padding: 32px 28px; transition: background .22s; }
.cap-card:hover { background: var(--bg-3); }
.cap-card h5 { font-size: 16px; color: #fff; margin-bottom: 8px; padding-left: 14px; position: relative; }
.cap-card h5::before { content: ""; position: absolute; left: 0; top: 6px; bottom: 6px; width: 3px; background: var(--cy); }
.cap-card p { font-size: 13.5px; color: var(--tx2); line-height: 1.75; }

/* ---------- CTA ---------- */
.cta { position: relative; overflow: hidden; }
.cta-bg { position: absolute; inset: -10% 0; background: url("assets/img/cta-hall.jpg") center/cover no-repeat; will-change: transform; }
.cta::before { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, rgba(6,11,20,.94) 10%, rgba(6,11,20,.72) 55%, rgba(6,11,20,.5)); }
.cta-inner { position: relative; z-index: 2; padding: 110px 0; display: flex; align-items: center; justify-content: space-between; gap: 44px; flex-wrap: wrap; }
.cta h2 { font-size: clamp(25px, 2.9vw, 36px); color: #fff; }
.cta p { color: var(--tx2); margin-top: 12px; max-width: 560px; font-size: 15px; }
.cta .cta-list { margin-top: 22px; display: flex; flex-wrap: wrap; gap: 10px 26px; }
.cta .cta-list span { font-size: 13.5px; color: var(--tx2); display: inline-flex; align-items: center; gap: 8px; }
.cta .cta-list span::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--cy); }

/* ---------- 页脚 ---------- */
.footer { background: #04080F; border-top: 1px solid var(--line-soft); color: var(--tx2); }
.footer-top {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.1fr; gap: 48px;
  padding: 68px 0 52px;
}
.footer .logo-text { color: #fff; }
.footer-brand p { font-size: 13.5px; margin-top: 14px; max-width: 300px; line-height: 1.85; color: var(--tx2); }
.footer h6 { color: rgba(255,255,255,.85); font-size: 14px; letter-spacing: .08em; margin-bottom: 16px; font-weight: 650; }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col a { font-size: 13.5px; transition: color .2s; }
.footer-col a:hover { color: var(--cy); }
.footer-col p { font-size: 13.5px; line-height: 1.8; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 24px 0; font-size: 12.5px; color: var(--tx3); border-top: 1px solid var(--line-soft); }
.icp-link { color: var(--tx3); text-decoration: none; transition: color .2s; }
.icp-link:hover { color: var(--cy); text-decoration: underline; }

/* ---------- 解决方案页分区 ---------- */
.sol-section { padding: 56px; border: 1px solid var(--line-soft); background: var(--bg-2); border-radius: 8px; scroll-margin-top: 96px; }
.sol-section + .sol-section { margin-top: 28px; }
.sol-section-head { display: flex; align-items: baseline; gap: 18px; margin-bottom: 32px; flex-wrap: wrap; }
.sol-section-head .sol-no { font-size: 13px; font-weight: 750; color: var(--cy); letter-spacing: .2em; }
.sol-section-head h3 { font-size: clamp(20px, 2.2vw, 26px); color: #fff; }
.sol-section-head .sol-en { color: var(--tx3); font-size: 12px; letter-spacing: .28em; margin-left: auto; }

/* ---------- 案例详情页 ---------- */
.case-detail {
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center;
  padding: 56px; border: 1px solid var(--line-soft); background: var(--bg-2); border-radius: 8px;
}
.case-detail + .case-detail { margin-top: 28px; }
.case-detail:nth-child(even) .case-info { order: 2; }
.case-detail .case-photo { border-radius: 6px; overflow: hidden; border: 1px solid var(--line-soft); }
.case-detail .case-photo img { width: 100%; height: 100%; object-fit: cover; }
.case-tag { display: inline-block; font-size: 12px; letter-spacing: .14em; padding: 5px 14px; border: 1px solid var(--line); color: var(--tx2); border-radius: 2px; margin-bottom: 14px; }
.case-info h3 { font-size: clamp(19px, 2.1vw, 24px); color: #fff; margin-bottom: 14px; }
.case-info h6 { font-size: 13px; color: var(--cy); letter-spacing: .12em; margin: 16px 0 6px; }
.case-info p { font-size: 14px; color: var(--tx2); }
.case-figures { display: flex; gap: 12px; margin-top: 22px; flex-wrap: wrap; }
.case-figures .fig { flex: 1; min-width: 110px; border: 1px solid var(--line-soft); border-top: 2px solid var(--cy); padding: 15px 12px; text-align: center; }
.case-figures .fig b { display: block; font-size: 23px; color: #fff; font-weight: 800; font-variant-numeric: tabular-nums; }
.case-figures .fig b i { font-style: normal; font-size: 13px; color: var(--cy); }
.case-figures .fig span { font-size: 12px; color: var(--tx2); }

/* ---------- 关于页时间线 ---------- */
.timeline { border-top: 1px solid var(--line-soft); margin-top: 8px; }
.timeline-item { display: grid; grid-template-columns: 160px 1fr; gap: 30px; padding: 30px 6px; border-bottom: 1px solid var(--line-soft); }
.timeline-item h5 { font-size: 17px; color: #fff; }
.timeline-item .t-no { font-size: 12.5px; font-weight: 750; color: var(--cy); letter-spacing: .2em; margin-bottom: 4px; }
.timeline-item p { font-size: 14.5px; color: var(--tx2); max-width: 760px; }

/* ---------- 联系页 ---------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.1fr; gap: 64px; align-items: start; }
.contact-info h3 { font-size: 22px; color: #fff; margin-bottom: 20px; }
.contact-line { display: grid; grid-template-columns: 92px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line-soft); font-size: 14.5px; }
.contact-line b { color: var(--tx3); font-weight: 600; font-size: 13px; letter-spacing: .1em; padding-top: 2px; }
.form-card { border: 1px solid var(--line-soft); padding: 40px; background: var(--bg-2); border-radius: 8px; }
.form-card h4 { font-size: 19px; color: #fff; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--tx); margin-bottom: 7px; }
.form-field input, .form-field textarea, .form-field select {
  width: 100%; padding: 12px 15px; border: 1px solid var(--line); border-radius: 3px;
  font-size: 14px; font-family: inherit; background: rgba(255,255,255,.04); color: var(--tx);
  outline: none; transition: border .2s, background .2s;
}
.form-field input::placeholder, .form-field textarea::placeholder { color: var(--tx3); }
.form-field input:focus, .form-field textarea:focus, .form-field select:focus { border-color: var(--cy); background: rgba(58,200,220,.05); }
.form-field .err { color: #E0705C; font-size: 12.5px; margin-top: 5px; display: none; }
.form-field.invalid input, .form-field.invalid textarea { border-color: #E0705C; }
.form-field.invalid .err { display: block; }
.form-ok { display: none; margin-top: 16px; padding: 13px 16px; border: 1px solid rgba(58,200,220,.4); background: rgba(58,200,220,.08); color: var(--cy); font-size: 13.5px; border-radius: 3px; }
.form-note { font-size: 12.5px; color: var(--tx3); margin-top: 14px; }

/* ---------- 滚动显现 ---------- */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity .75s ease, transform .75s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-bg, .imm-bg, .cta-bg { transform: none !important; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .tile-grid { grid-template-columns: 1fr 1fr; }
  .fusion-grid { grid-template-columns: 1fr 1fr; }
  .plat-row, .split, .case-detail, .contact-wrap { grid-template-columns: 1fr; gap: 36px; }
  .plat-row:nth-child(even) .plat-shot, .split-reverse .split-text { order: 0; }
  .cap-grid { grid-template-columns: 1fr 1fr; }
  .flow-grid { grid-template-columns: repeat(2, 1fr); }
  .case-row { grid-template-columns: 150px 1fr; }
  .case-row .go { display: none; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .sol-section, .case-detail { padding: 36px 26px; }
}
@media (max-width: 720px) {
  .section { padding: 76px 0; }
  .nav-links {
    position: fixed; top: 0; right: -100%; height: 100vh; width: min(78vw, 320px);
    flex-direction: column; align-items: flex-start; justify-content: center; gap: 22px;
    padding: 0 34px; background: rgba(6,11,20,.97); backdrop-filter: blur(16px);
    transition: right .35s ease; overflow-y: auto;
  }
  .nav.open .nav-links { right: 0; }
  .nav-links > a, .nav-item > a { color: var(--tx); }
  .nav-toggle { display: flex; z-index: 101; }
  .nav.open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.open .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav.open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .nav-links .nav-item { width: 100%; }
  .dropdown-menu {
    position: static; transform: none; opacity: 1; visibility: visible;
    box-shadow: none; background: transparent; border: none;
    padding: 2px 0 0 16px; display: none; min-width: 0;
  }
  .nav-item.expanded .dropdown-menu { display: block; }
  .dropdown-menu a { color: var(--tx2) !important; padding: 8px 10px; }
  .tile-grid { grid-template-columns: 1fr; }
  .tile { height: 220px; }
  .fusion-grid { grid-template-columns: 1fr; }
  .hero { min-height: 100svh; }
  .imm { min-height: 72vh; }
  .imm::before, .imm.alt::before { background: linear-gradient(180deg, rgba(6,11,20,.55), rgba(6,11,20,.92) 78%); }
  .imm-content { padding: 70px 0; }
  .strip-inner { flex-wrap: wrap; }
  .strip .strip-item { flex: 1 1 46%; padding: 20px 16px; }
  .strip .strip-item:nth-child(odd) { border-left: none; padding-left: 0; }
  .strip .strip-item:nth-child(n+3) { border-top: 1px solid var(--line-soft); }
  .flow-grid, .cap-grid, .form-row { grid-template-columns: 1fr; }
  .case-row { grid-template-columns: 1fr; gap: 14px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .sol-row { grid-template-columns: 44px 1fr; }
  .sol-row .go { display: none; }
  .timeline-item { grid-template-columns: 1fr; gap: 8px; }
  .cta-inner { padding: 76px 0; }
  .plat-row { gap: 30px; }
}

/* ==========================================================
   v3.1 修订：品牌 logo / 全称 / 导航直达 / 渐变提亮 / 字号加大
   ========================================================== */

/* ---------- 品牌 logo 与全称 ---------- */
.logo-img { height: 46px; width: auto; display: block; }
.logo-text { font-size: 16.5px; font-weight: 700; letter-spacing: .04em; }
.logo-text small { font-size: 8.5px; letter-spacing: .22em; }
.nav-links { gap: 26px; }
.footer-logo { height: 56px; }
.footer-brand-row { display: flex; align-items: center; gap: 14px; margin-bottom: 6px; }

/* ---------- 下拉菜单：更丰富的直达入口 ---------- */
.dropdown-menu { min-width: 320px; }
.dropdown-menu .dd-sep { display: block; height: 1px; background: var(--line-soft); margin: 6px 10px; }
.dropdown-menu a b { font-size: 14px; }
.dropdown-menu a small { font-size: 12px; color: var(--tx3); }
.dropdown-menu a:hover b { color: var(--cy); }

/* ---------- 首屏：更大更居中的文字 ---------- */
.hero-content { padding-top: 40px; }
.hero-brand { margin-bottom: 30px; }
.hero-brand img { height: 62px; }
.hero-brand span { font-size: 21px; font-weight: 700; letter-spacing: .12em; }
.hero-brand small { font-size: 10px; letter-spacing: .34em; }
.hero-sub {
  font-size: clamp(17px, 1.8vw, 21px); color: rgba(255,255,255,.88);
  font-weight: 500; letter-spacing: .28em; margin: 24px 0 6px;
}
.hero-tags {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap;
  gap: 12px 0; margin: 0 auto 40px; max-width: 760px;
}
.hero-tags span { color: rgba(255,255,255,.75); font-size: 14.5px; }
.hero-tags i { width: 4px; height: 4px; border-radius: 50%; background: var(--cy); margin: 0 14px; display: inline-block; opacity: .8; }
.hero-actions { padding-bottom: 76px; }

/* ---------- 渐变提亮：分区光晕 ---------- */
#tiles {
  background:
    radial-gradient(52% 42% at 12% 0%, rgba(58,200,220,.10), transparent 70%),
    radial-gradient(45% 40% at 92% 8%, rgba(90,120,255,.08), transparent 70%),
    var(--bg);
}
#fusion {
  background:
    radial-gradient(48% 40% at 85% 6%, rgba(58,200,220,.09), transparent 72%),
    radial-gradient(40% 36% at 8% 90%, rgba(90,120,255,.07), transparent 70%),
    var(--bg);
}
#platform {
  background:
    linear-gradient(180deg, var(--bg) 0%, #0A1526 50%, var(--bg) 100%);
}
.sec-title {
  background: linear-gradient(95deg, #FFFFFF 30%, #9BDDE7 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tile-no { letter-spacing: .3em; }

/* ---------- 介绍文字加大 ---------- */
.tile-body b { font-size: 19.5px; }
.tile-body span { font-size: 14.5px; color: var(--tx2); }
.tile-body { padding: 26px 28px; }
.fusion-item { padding: 34px 30px; cursor: pointer; }
.fusion-item b { font-size: 17.5px; }
.fusion-item p { font-size: 14.5px; line-height: 1.8; }
.fusion-item u {
  text-decoration: none; color: var(--cy); font-size: 13.5px; font-weight: 600;
  display: inline-block; margin-top: 8px; transition: transform .22s;
}
.fusion-item:hover u { transform: translateX(4px); }
.fusion-item { position: relative; }
.fusion-item::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: linear-gradient(90deg, var(--cy), transparent);
  transform: scaleX(0); transform-origin: left; transition: transform .3s;
}
.fusion-item:hover::after { transform: scaleX(1); }
.imm-points i { font-size: 13.5px; padding: 7px 16px; color: var(--tx); border-color: rgba(148,180,210,.22); }
.imm-content p { font-size: 15.5px; }
.imm-kicker { color: var(--cy) !important; font-size: 15px !important; letter-spacing: .04em; }
.sol-row p { font-size: 14.5px; }
.case-row .case-desc { font-size: 14.5px; }
.cap-card p { font-size: 14.5px; line-height: 1.8; }
.strip-item span { font-size: 13.5px; color: var(--tx2); }
.sec-desc { font-size: 16px; color: var(--tx2); }
.plat-info p { font-size: 15.5px; }

/* ---------- 沉浸式分区渐变提亮 ---------- */
.imm::before { z-index: 1; }
.imm .container { position: relative; z-index: 2; }
.imm-no { letter-spacing: .34em; }

@media (max-width: 720px) {
  .logo-img { height: 38px; }
  .logo-text { font-size: 14px; }
  .logo-text small { font-size: 7.5px; }
  .hero-brand img { height: 52px; }
  .hero-brand span { font-size: 17px; }
  .hero-sub { letter-spacing: .18em; }
  .hero-tags span { font-size: 13px; }
  .hero-tags i { margin: 0 9px; }
  .fusion-item { padding: 28px 24px; }
}

/* ==========================================================
   v3.2：核心业务下拉改为顶部横向大面板（mega menu）
   ========================================================== */
@media (min-width: 1001px) {
  .dropdown-menu.mega {
    position: fixed; left: 0; right: 0; top: 90px;
    width: auto; min-width: 0; transform: none;
    display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px 10px; padding: 20px max(24px, calc((100% - 1240px) / 2)) 24px;
    border-radius: 0; border-left: none; border-right: none;
    background: rgba(8, 14, 26, .97);
  }
  .nav-item:hover .dropdown-menu.mega { transform: none; }
  /* 悬停桥：面板上方的隐形过渡区，防止鼠标移过去时面板消失 */
  .dropdown-menu.mega::before {
    content: ""; position: absolute; left: 0; right: 0;
    top: -46px; height: 46px;
  }
  .dropdown-menu.mega .mega-head {
    grid-column: 1 / -1;
    font-size: 12px; font-weight: 600; letter-spacing: .2em;
    color: var(--cy); padding: 4px 8px 12px;
    border-bottom: 1px solid var(--line-soft); margin-bottom: 8px;
  }
  .dropdown-menu.mega a {
    padding: 15px 16px; border: 1px solid transparent;
    border-radius: 4px; background: rgba(255,255,255,.015);
  }
  .dropdown-menu.mega a:hover {
    background: rgba(58,200,220,.09); border-color: var(--line-soft);
  }
  .dropdown-menu.mega a b { font-size: 15px; }
  .dropdown-menu.mega a small { font-size: 12.5px; margin-top: 4px; line-height: 1.55; }
}

/* ==========================================================
   v3.3：核心业务 6 大业务平铺进顶部导航一排（宽屏）
   ========================================================== */
.biz-flat { display: none; }
@media (min-width: 1300px) {
  .nav-inner.container { max-width: 1480px; }
  .nav-links { gap: 18px; }
  .biz-flat { display: contents; }
  .nav-biz-drop { display: none; }
  .biz-flat a {
    color: rgba(255,255,255,.78); font-size: 15px; font-weight: 500;
    position: relative; transition: color .25s; white-space: nowrap;
  }
  .biz-flat a::after {
    content: ""; position: absolute; left: 0; bottom: -7px;
    width: 0; height: 2px; background: var(--cy); transition: width .25s;
  }
  .biz-flat a:hover { color: #fff; }
  .biz-flat a:hover::after { width: 100%; }
  .biz-flat a.active { color: var(--cy); }
  .biz-flat a.active::after { width: 100%; }
}