:root {
      --bg: #05060f;
      --fg: #eceff7;
      --muted: rgba(236,239,247,.7);
      --accent: #7fb2ff; --accent-strong:#5b93f5;
      --font-display:-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Noto Sans SC',system-ui,sans-serif;
      --font-mono:ui-monospace,'JetBrains Mono','SF Mono','Cascadia Code',Menlo,monospace;
      --container:1200px; --gutter:32px; --ease:cubic-bezier(.22,1,.36,1);
    }
    *,*::before,*::after{box-sizing:border-box;} html{-webkit-text-size-adjust:100%;background:#05060f;}
    body{margin:0;background:transparent;color:#eceff7;font-family:var(--font-display);line-height:1.5;-webkit-font-smoothing:antialiased;}
    img,svg{display:block;max-width:100%;} a{color:inherit;text-decoration:none;} :focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
    .container{max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter);}

    /* 三层固定底图：明确 z 层级（3D #stage 最底 z0 → 2D 白星 #stars2d 中层 z1 → 正文 .page 顶层 z2）。
       不用 translateZ/will-change 制造合成层，避免 Safari/WebKit 滚动时层合成错乱、遮住白星或闪空。 */
    #stage{position:fixed;inset:0;z-index:-2;width:100%;height:100%;pointer-events:none;}
    #stars2d{position:fixed;inset:0;z-index:-1;width:100%;height:100%;pointer-events:none;}
    .page{position:relative;z-index:1;}

    /* 导航：半透明纯色暗底（不用 backdrop-filter，避免与合成层打架） */
    .topnav{position:sticky;top:0;z-index:50;background:rgba(5,6,15,.86);border-bottom:1px solid rgba(255,255,255,.08);}
    .topnav .inner{display:flex;align-items:center;justify-content:space-between;padding-block:16px;}
    .logo{font-weight:700;letter-spacing:-.01em;font-size:19px;color:#fff;} .brand{display:inline-flex;align-items:center;gap:10px;} .logo-img{height:26px;width:auto;display:block;} .topnav nav{display:flex;gap:30px;} .topnav nav a{font-size:14px;color:rgba(236,239,247,.6);} .topnav nav a:hover{color:#fff;} .topnav nav a.on{color:#fff;font-weight:600;}
    @media(max-width:760px){.topnav nav{display:none;}}
    .eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:0 0 20px;}
    .meta{font-family:var(--font-mono);font-size:13px;color:rgba(236,239,247,.55);}

    .hero{position:relative;min-height:100svh;display:grid;align-items:center;}
    .hero .inner{position:relative;z-index:2;max-width:900px;}
    .hero .line{display:block;overflow:hidden;} .hero .line>span{display:inline-block;}
    .hero h1{font-size:clamp(46px,9vw,120px);line-height:1.02;letter-spacing:-.03em;font-weight:700;margin:0 0 26px;}
    .hero .lede{font-size:clamp(17px,1.9vw,21px);max-width:54ch;margin:0 0 38px;color:rgba(236,239,247,.74);}
    .hero .cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;}
    .hero-scroll{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:3;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:rgba(236,239,247,.5);text-transform:uppercase;animation:bob 2.4s ease-in-out infinite;}
    @keyframes bob{0%,100%{transform:translate(-50%,0);}50%{transform:translate(-50%,7px);}}

    .btn{display:inline-flex;align-items:center;gap:9px;padding:14px 26px;border-radius:999px;font-weight:600;font-size:15px;border:1px solid transparent;transition:transform .2s var(--ease),background .2s,border-color .2s,box-shadow .2s;}
    .btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 30px rgba(90,150,245,.4);} .btn-primary:hover{background:var(--accent-strong);transform:translateY(-2px);}
    .btn-secondary{color:#fff;border-color:rgba(255,255,255,.22);background:rgba(255,255,255,.04);} .btn-secondary:hover{border-color:#fff;transform:translateY(-2px);}
    .btn .arr{transition:transform .2s var(--ease);display:inline-block;} .btn:hover .arr{transform:translateX(4px);}

    .section{padding-block:clamp(80px,11vw,150px);background:transparent;} .section+.section{border-top:1px solid rgba(255,255,255,.08);}
    h2.sec{font-size:clamp(32px,4.6vw,56px);line-height:1.08;letter-spacing:-.025em;margin:0 0 18px;color:#fff;}
    .sub{font-size:17px;max-width:56ch;color:rgba(236,239,247,.7);}
    .grid-2{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;} .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
    @media(max-width:960px){.grid-2,.grid-3{grid-template-columns:1fr;}}
    /* about：编辑式声明 + 公司自身的「结构化数据表」(呼应“让 AI 读懂你”) */
    .about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(40px,6vw,80px);align-items:start;}
    @media(max-width:960px){.about-grid{grid-template-columns:1fr;}}
    .about-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px;}
    .about-tag{font-size:13px;color:rgba(236,239,247,.72);border:1px solid rgba(255,255,255,.14);padding:8px 16px;border-radius:999px;}
    .data-card{border:1px solid rgba(255,255,255,.12);border-radius:20px;background:rgba(8,10,26,.18);padding:30px;}
    .facts{display:grid;margin:0;}
    .fact{display:grid;grid-template-columns:96px 1fr;gap:16px;padding:14px 0;border-top:1px solid rgba(255,255,255,.1);align-items:baseline;}
    .fact:first-child{border-top:0;padding-top:0;}
    .fact dt{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:rgba(236,239,247,.45);}
    .fact dd{margin:0;font-size:16px;color:#fff;line-height:1.5;}
    .fact dd.mono{font-family:var(--font-mono);color:rgba(236,239,247,.85);}
    .lead{font-size:22px;line-height:1.5;max-width:50ch;color:rgba(236,239,247,.72);} .lead b{color:#fff;font-weight:600;}
    .big{font-size:clamp(36px,5.4vw,72px);line-height:1.06;letter-spacing:-.03em;font-weight:700;} .big .muted{color:rgba(236,239,247,.5);font-weight:300;}

    .svc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;} @media(max-width:760px){.svc-grid{grid-template-columns:1fr;}}
    .svc{position:relative;border-radius:20px;overflow:hidden;border:1px solid rgba(255,255,255,.12);background:rgba(8,10,26,.35);transition:transform .35s var(--ease),box-shadow .35s,border-color .35s;}
    /* 价值板块（首页，价值导向；黄金分割左右分栏：左大卡 sticky 固定，右小卡随页滚动） */
    /* 价值板块：滚动驱动 sticky 轮播（左大卡钉住，右列 3 张一窗随滚动推进，用完再继续往下） */
    .value-pin-track{position:relative;height:175vh;}
    @media(max-width:960px){.value-pin-track{height:auto;}}
    .value-pin{position:sticky;top:84px;display:flex;flex-direction:column;height:min(78vh,600px);}
    @media(max-width:960px){.value-pin{position:static;height:auto;}}
    .value-head{margin-bottom:18px;}
    @media(max-width:960px){.value-head{margin-bottom:24px;}}
    .value-body{flex:1;min-height:0;display:grid;grid-template-columns:1.618fr 1fr;gap:24px;align-items:stretch;}
    @media(max-width:960px){.value-body{grid-template-columns:1fr;}}
    .value-big{display:flex;flex-direction:column;justify-content:center;padding:24px 26px;border-radius:22px;border:1px solid rgba(255,255,255,.12);background:rgba(8,10,26,.23);box-shadow:0 24px 60px rgba(0,0,0,.4);}
    .value-big .idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.05em;color:var(--accent);}
    .value-big h3{font-size:clamp(24px,2.8vw,32px);color:#fff;letter-spacing:-.02em;margin:12px 0 14px;}
    .value-big p{color:rgba(236,239,247,.74);font-size:16px;line-height:1.66;margin:0;}
    .value-big .chips{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--accent);display:block;margin-top:18px;}
    .value-viewport{overflow:hidden;min-height:0;}
    .value-track{display:flex;flex-direction:column;gap:16px;width:100%;will-change:transform;}
    .value-small{display:flex;gap:16px;align-items:center;padding:26px 26px;border-radius:18px;border:1px solid rgba(255,255,255,.12);background:rgba(8,10,26,.18);transition:border-color .3s,box-shadow .3s;}
    .value-small:hover{border-color:color-mix(in oklch,var(--accent) 45%,rgba(255,255,255,.15));box-shadow:0 12px 32px rgba(0,0,0,.35);}
    .value-small .idx{font-family:var(--font-mono);font-size:13px;letter-spacing:.05em;color:var(--accent);flex:0 0 auto;}
    .value-small h3{font-size:20px;color:#fff;margin:0 0 6px;letter-spacing:-.01em;}
    .value-small p{font-size:15px;color:rgba(236,239,247,.68);margin:0;line-height:1.6;}
    .chips{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--accent);margin-top:auto;}
    /* differentiator：标题在上 + 3 个编号横排栏（编辑/结构化，区别于上面的卡片粘性区） */
    .diff-head{max-width:720px;margin-bottom:44px;}
    .diff-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px;}
    @media(max-width:880px){.diff-grid{grid-template-columns:1fr;gap:22px;}}
    .diff-item{border:1px solid rgba(255,255,255,.16);border-radius:20px;padding:24px 26px;display:flex;flex-direction:column;gap:8px;background:rgba(10,13,28,.5);backdrop-filter:blur(18px) saturate(150%);-webkit-backdrop-filter:blur(18px) saturate(150%);box-shadow:inset 0 1px 0 rgba(255,255,255,.22),inset 0 -1px 0 rgba(255,255,255,.05),0 8px 32px rgba(0,0,0,.35);}
    @media(max-width:880px){.diff-item{padding:22px 24px;}}
    .diff-item .num{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--accent);}
    .diff-item .meta{font-family:var(--font-mono);font-size:13px;color:var(--muted);}
    .diff-item h3{font-size:20px;color:#fff;margin:2px 0 4px;letter-spacing:-.01em;}
    .diff-item p{font-size:15px;color:rgba(236,239,247,.68);margin:0;max-width:26ch;line-height:1.6;}
    .svc:hover{transform:translateY(-4px);box-shadow:0 20px 50px rgba(0,0,0,.4);border-color:color-mix(in oklch,var(--accent) 45%,rgba(255,255,255,.15));}
    .svc .media{aspect-ratio:16/9;background:rgba(127,178,255,.08);overflow:hidden;} .svc .media img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease);} .svc:hover .media img{transform:scale(1.06);}
    .svc .body{padding:20px 22px 24px;color:#eef1f8;} .svc .idx{font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--accent);} .svc h3{font-size:21px;margin:8px 0 6px;letter-spacing:-.01em;} .svc p{margin:0;font-size:15px;color:rgba(236,239,247,.68);}
    .svc-cta{display:flex;flex-direction:column;justify-content:center;gap:14px;padding:28px;background:rgba(127,178,255,.05);border:1px dashed color-mix(in oklch,var(--accent) 32%,rgba(255,255,255,.2));border-radius:20px;color:#eef1f8;}
    .svc-cta h3{font-size:24px;margin:0 0 6px;letter-spacing:-.01em;} .svc-cta p{color:rgba(236,239,247,.68);font-size:15px;}

    .stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:0;}
    @media(max-width:880px){.stat-row{grid-template-columns:1fr;gap:28px;}}
    .stat{padding:0 34px;}
    .stat:first-child{padding-left:0;padding-right:38px;}
    .stat + .stat{border-left:1px solid rgba(255,255,255,.22);}
    @media(max-width:880px){.stat{padding:0;}.stat + .stat{border-left:0;border-top:1px solid rgba(255,255,255,.22);padding-top:26px;}}
    .stat .num{font-size:clamp(48px,6.5vw,96px);line-height:.95;letter-spacing:-.045em;font-weight:700;font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:#fff;position:relative;display:inline-block;}
    .stat .sub{font-size:17px;margin-top:16px;color:#fff;font-weight:600;letter-spacing:-.01em;}
    .stat .lbl{font-size:14px;margin-top:6px;max-width:30ch;color:rgba(236,239,247,.6);line-height:1.55;}
    .card{border:1px solid rgba(255,255,255,.12);border-radius:20px;background:rgba(8,10,26,.35);padding:30px;} .card .meta{display:block;margin-bottom:8px;} .card h4{margin:0 0 4px;font-size:18px;color:#fff;} .card p{margin:0;font-size:15px;color:rgba(236,239,247,.68);}

    .cta-strip{text-align:center;} .cta-strip h2{font-size:clamp(34px,5vw,64px);letter-spacing:-.03em;margin:0 0 14px;color:#fff;} .cta-strip p{font-size:18px;margin:0 0 34px;color:rgba(236,239,247,.68);}
    .foot{border-top:1px solid rgba(255,255,255,.08);padding-block:clamp(60px,8vw,100px) 40px;}
    .foot-brand{display:flex;align-items:center;gap:16px;margin-bottom:30px;}
    .foot-logo-img{height:34px;width:auto;}
    .foot-brand-name{font-size:23px;font-weight:700;letter-spacing:-.01em;color:#fff;}
    .foot-en{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:rgba(236,239,247,.45);align-self:flex-end;padding-bottom:3px;}
    .foot-statement{font-size:clamp(28px,4.4vw,52px);line-height:1.1;letter-spacing:-.03em;font-weight:700;margin:0 0 42px;color:#fff;max-width:22ch;} .foot-statement .accent{color:var(--accent);}
    .foot-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding-top:36px;border-top:1px solid rgba(255,255,255,.08);}
    @media(max-width:760px){.foot-grid{grid-template-columns:1fr;gap:26px;}}
    .foot-col h5{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:rgba(236,239,247,.4);margin:0 0 16px;}
    .foot-col a{display:block;font-size:15px;color:rgba(236,239,247,.72);margin-bottom:11px;transition:color .2s;} .foot-col a:hover{color:#fff;}
    .foot-col .muted{font-size:14px;color:rgba(236,239,247,.5);line-height:1.6;margin:0;}
    .foot-bar{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.08);font-size:13px;color:rgba(236,239,247,.45);} .foot-bar a{color:rgba(236,239,247,.6);} .foot-bar a:hover{color:#fff;}

    @media(prefers-reduced-motion:no-preference){
      .hero .line>span{transform:translateY(112%);animation:lineUp .85s var(--ease) forwards;} .hero .line:nth-child(2)>span{animation-delay:.18s;}
      .hero .eyebrow{animation:fadeUp .7s var(--ease) .05s both;} .hero .lede{animation:fadeUp .8s var(--ease) .5s both;} .hero .cta{animation:fadeUp .8s var(--ease) .68s both;}
      /* 关闭滚动 reveal 的 opacity/transform 入场（避免合成层与固定背景冲突），内容始终可见 */
      .js .reveal, .js .reveal.is-in, .js .reveal[data-stagger]>*, .js .reveal.is-in[data-stagger]>*{opacity:1;transform:none;}
    }
    @keyframes lineUp{to{transform:translateY(0);}} @keyframes fadeUp{from{opacity:0;transform:translateY(16px);}to{opacity:1;transform:none;}}

    /* ===== 产品与服务页新增 ===== */
    /* 家族色系：冰蓝 5 阶（深空/深色场景选用中间偏浅档，叠深底可读） */
    .ice-1{--ice:#C5D9F1;} .ice-2{--ice:#8ACCEB;} .ice-3{--ice:#5FC3E5;} .ice-4{--ice:#1688C5;} .ice-5{--ice:#0B5A96;}
    /* 产品页 hero 说明行（等宽字段标签，呼应"结构化数字身份"母题） */
    .spec{display:flex;flex-wrap:wrap;gap:0 34px;font-family:var(--font-mono);font-size:13px;color:rgba(236,239,247,.62);} .spec b{color:#fff;font-weight:600;} .spec i{font-style:normal;color:var(--accent);}
    /* 服务目录：左栏 sticky 编号索引 + 右栏滚动卡（C 布局） */
    .cat{display:grid;grid-template-columns:216px 1fr;gap:clamp(28px,4vw,64px);align-items:start;}
    .svc-index{position:sticky;top:96px;display:grid;gap:6px;}
    .svc-index a{display:flex;align-items:baseline;gap:12px;padding:9px 10px;border-radius:10px;color:rgba(236,239,247,.5);transition:color .2s,background .2s;}
    .svc-index a:hover{color:#fff;}
    .svc-index a .n{font-family:var(--font-mono);font-size:14px;letter-spacing:.05em;color:rgba(236,239,247,.4);}
    .svc-index a .t{font-size:15px;line-height:1.3;}
    .svc-index a.on{color:#fff;background:rgba(127,178,255,.09);}
    .svc-index a.on .n{color:var(--accent);font-weight:600;}
    .svc-list{display:grid;gap:20px;min-width:0;}
    .svc-card{position:relative;display:grid;grid-template-columns:330px 1fr;gap:0;border:1px solid rgba(255,255,255,.12);border-radius:22px;overflow:hidden;background:rgba(8,10,26,.2);transition:border-color .35s,box-shadow .35s,transform .35s var(--ease);}
    .svc-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--ice);opacity:.55;}
    .svc-card:hover{border-color:color-mix(in oklch,var(--ice) 55%,rgba(255,255,255,.15));box-shadow:0 24px 60px rgba(0,0,0,.45);transform:translateY(-3px);}
    .svc-media{position:relative;min-height:280px;height:100%;overflow:hidden;background:rgba(127,178,255,.06);}
    .svc-media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .7s var(--ease),filter .7s;}
    .svc-card:hover .svc-media img{transform:scale(1.06);filter:saturate(1.1);}
    .svc-media .num{position:absolute;top:14px;left:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;background:rgba(5,6,15,.72);border:1px solid color-mix(in oklch,var(--ice) 60%,rgba(255,255,255,.15));color:var(--ice);padding:5px 12px;border-radius:999px;backdrop-filter:blur(4px);}
    .svc-body{padding:30px 34px;display:flex;flex-direction:column;justify-content:center;}
    .svc-body .kicker{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ice);text-transform:uppercase;margin:0 0 14px;} .svc-body .kicker::before{content:"";width:22px;height:2px;background:var(--ice);border-radius:1px;}
    .svc-body h3{font-size:30px;letter-spacing:-.02em;margin:0 0 12px;color:#fff;}
    .svc-body p{font-size:16px;line-height:1.65;color:rgba(236,239,247,.74);margin:0;max-width:52ch;}
    .svc-body .tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px;font-size:13px;} .svc-body .tags span{color:rgba(236,239,247,.7);border:1px solid rgba(255,255,255,.14);padding:5px 12px;border-radius:999px;} .svc-body .tags span i{font-style:normal;color:var(--ice);margin-right:6px;}
    .svc-body .go{margin-top:22px;font-size:14px;color:var(--ice);display:inline-flex;align-items:center;gap:7px;font-weight:500;} .svc-body .go .arr{transition:transform .2s var(--ease);} .svc-body .go:hover .arr{transform:translateX(4px);}
    @media(max-width:980px){.cat{grid-template-columns:1fr;}.svc-index{position:static;grid-template-columns:repeat(3,1fr);gap:4px;margin-bottom:10px;} .svc-index a{flex-direction:column;gap:4px;padding:10px 8px;border:1px solid rgba(255,255,255,.1);border-radius:10px;} .svc-index a .n{font-size:12px;} .svc-index a .t{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;}}
    @media(max-width:880px){.svc-card{grid-template-columns:1fr;}.svc-media{aspect-ratio:16/9;}}
    /* 结构化备注卡片 */
    .note{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(36px,5vw,64px);align-items:center;}
    @media(max-width:880px){.note{grid-template-columns:1fr;}}

    /* ===== 外置化清理：从 inline style 迁移的语义类 ===== */
    .accent{color:var(--accent);}                       /* inline 高亮词 */
    .hl{color:#fff;font-weight:600;}                    /* 正文内强调 span */
    .lead-strong{color:#fff;font-weight:500;}           /* lead 强调态 */
    .stack{align-self:center;}                          /* 右侧栈垂直居中 */
    .sub-gap{margin-top:14px;}                          /* sub 距上一元素 */
    .sub-below{margin:24px 0 0;}                        /* 列表下方 sub */
    .sub-wide{max-width:62ch;}                          /* 更宽 sub */
    .sec-gap-top{margin-top:20px;}                      /* sec 距 spec 行 */
    .sec-flush{padding-top:0;}                          /* section 顶部去 padding */
    .cta-center{text-align:center;margin-top:32px;}     /* 居中 CTA 容器 */
    .eyebrow-center{text-align:center;}                 /* 居中 eyebrow */
    .eyebrow-slim{margin-bottom:16px;}                  /* 紧 bottom 的 eyebrow */
    .btn-sm{padding:10px 18px;font-size:14px;}          /* 导航用小按钮 */
    .btn-lg{padding:16px 32px;}                         /* CTA 大按钮 */
    .principle{display:flex;flex-direction:column;gap:10px;background:rgba(8,10,26,.18);border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:30px;}  /* 服务页原则卡 */
    .principle .meta{margin:0;}                         /* 原则卡 meta 去底距 */
    .principle .pr-desc{margin:0;font-size:15px;color:rgba(236,239,247,.68);}  /* 原则卡描述 */
    .pr-title{margin:0;font-size:18px;color:#fff;font-weight:600;}  /* 原则卡标题 */

    /* 深空磨砂玻璃：让卡片文字从星空背景中"浮"出来，更清晰 */
    .data-card, .value-big, .value-small, .svc-card, .principle {
      backdrop-filter: blur(18px) saturate(150%);
      -webkit-backdrop-filter: blur(18px) saturate(150%);
      background: rgba(10, 13, 28, .5);
      border: 1px solid rgba(255,255,255,.16);
      box-shadow:
        inset 0 1px 0 rgba(255,255,255,.22),   /* 顶部光线 */
        inset 0 -1px 0 rgba(255,255,255,.05),   /* 底部微反射 */
        0 8px 32px rgba(0,0,0,.35);             /* 外部悬浮阴影 */
    }