/* ==========================================================================
   桐灼GEO · V3 视觉方向预览
   theme-a：深蓝科技（推荐） / theme-b：明亮产品
   ========================================================================== */

:root{
  --brand:#2b4bff;
  --brand-2:#00a6d6;
  --cyan:#6fe7ff;
  --navy:#0b1533;
  --navy-2:#070d24;
  --white:#ffffff;
  --soft:#f4f7ff;
  --line:#e3e7f2;
  --text:#0b1533;
  --muted:#5b6380;
  --radius:20px;
  --shadow-sm:0 8px 28px rgba(15,29,74,.07);
  --shadow-md:0 18px 50px rgba(15,29,74,.10);
  --shadow-lg:0 40px 100px rgba(7,13,36,.18);
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular","Cascadia Mono","Consolas",monospace;
}

body.theme-a{
  --hero-bg:linear-gradient(160deg,#050a1c 0%,#0a1740 46%,#0d2158 100%);
  --hero-text:#ffffff;
  --hero-muted:rgba(214,224,255,.72);
  --header-text:#ffffff;
  --header-bg:transparent;
  --card-bg:#ffffff;
  --card-line:var(--line);
  --footer-bg:#070d24;
  --footer-text:#ffffff;
  --footer-muted:rgba(226,234,255,.58);
}
body.theme-b{
  --hero-bg:linear-gradient(180deg,#eef4ff 0%,#f8fbff 70%,#ffffff 100%);
  --hero-text:#0b1533;
  --hero-muted:#5b6380;
  --header-text:#0b1533;
  --header-bg:rgba(255,255,255,.9);
  --card-bg:#ffffff;
  --card-line:var(--line);
  --footer-bg:#0b1533;
  --footer-text:#ffffff;
  --footer-muted:rgba(226,234,255,.58);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--text);font-family:var(--sans);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
body.theme-a{background:var(--navy-2)}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer}
::selection{background:rgba(43,75,255,.2)}
.v3-shell{width:min(1240px,calc(100% - 48px));margin:0 auto}

/* ---------- 导航 ---------- */
.v3-header{position:absolute;top:0;left:0;right:0;z-index:30;color:var(--header-text)}
body.theme-b .v3-header{position:relative;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}
.v3-nav{height:78px;display:flex;align-items:center;gap:44px}
.v3-brand{display:inline-flex;align-items:center;gap:11px;font-size:21px;font-weight:800;letter-spacing:-.01em;white-space:nowrap}
.v3-brand img{width:34px;height:34px}
body.theme-a .v3-brand img{filter:brightness(0) invert(1)}
.v3-links{display:flex;gap:30px;font-size:14px;font-weight:500;opacity:.8}
.v3-links a:hover{opacity:1;color:var(--cyan)}
body.theme-b .v3-links a:hover{color:var(--brand)}
.v3-nav-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.v3-cta{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 18px;border-radius:10px;background:var(--brand);color:#fff;font-size:14px;font-weight:700;box-shadow:0 10px 24px rgba(43,75,255,.28)}
.v3-cta:hover{background:#1e3be0}
.v3-burger{display:none;width:42px;height:42px;border-radius:10px;border:1px solid var(--line);background:transparent;color:inherit;font-size:18px}

/* ---------- 首屏 ---------- */
.v3-hero{position:relative;overflow:hidden;background:var(--hero-bg);color:var(--hero-text);padding:150px 0 96px}
.v3-hero-bg{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.v3-hero-bg::after{content:"";position:absolute;right:0;top:0;width:54%;height:100%;background:url(/assets/img/server.webp) center/cover no-repeat;opacity:.16;mix-blend-mode:screen;mask-image:linear-gradient(to left,#000 0%,transparent 92%)}
body.theme-b .v3-hero-bg::after{opacity:.07;mix-blend-mode:multiply;mask-image:linear-gradient(to left,#000 0%,transparent 85%)}
.v3-orb{position:absolute;border-radius:50%;filter:blur(90px);opacity:.55}
.v3-orb-1{width:620px;height:620px;right:-140px;top:-180px;background:radial-gradient(circle,#2b4bff 0%,rgba(43,75,255,0) 70%)}
.v3-orb-2{width:520px;height:520px;left:-180px;bottom:-220px;background:radial-gradient(circle,#00b4d8 0%,rgba(0,180,216,0) 70%);opacity:.35}
body.theme-b .v3-orb-1{opacity:.25}
body.theme-b .v3-orb-2{opacity:.18}
.v3-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:64px 64px;mask-image:linear-gradient(180deg,rgba(0,0,0,.8),transparent 78%)}
body.theme-b .v3-grid{background-image:linear-gradient(rgba(43,75,255,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(43,75,255,.06) 1px,transparent 1px)}
.v3-lines{position:absolute;left:0;right:0;bottom:0;width:100%;height:58%;color:var(--cyan);opacity:.5}
body.theme-b .v3-lines{color:var(--brand);opacity:.25}
.v3-hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(440px,.98fr);gap:62px;align-items:center}
.v3-eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--hero-muted)}
.v3-eyebrow i{width:22px;height:1px;background:currentColor;display:inline-block}
.v3-hero h1{margin:24px 0 0;font-size:clamp(42px,4.5vw,64px);line-height:1.12;letter-spacing:-.025em;font-weight:800}
.v3-hero h1 em{font-style:normal;background:linear-gradient(90deg,#ffffff 0%,#a9c0ff 46%,#6fe7ff 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
body.theme-b .v3-hero h1 em{background:linear-gradient(90deg,#2b4bff,#00a6d6);-webkit-background-clip:text;background-clip:text;color:transparent}
.v3-hero-lead{max-width:600px;margin:24px 0 0;font-size:16.5px;line-height:1.95;color:var(--hero-muted)}
.v3-hero-lead strong{color:var(--hero-text);font-weight:700}
.v3-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.v3-btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:52px;padding:0 22px;border-radius:12px;font-size:15px;font-weight:700;border:1px solid transparent;transition:transform .2s,box-shadow .2s,background .2s}
.v3-btn:hover{transform:translateY(-2px)}
.v3-btn-primary{background:var(--brand);color:#fff;box-shadow:0 16px 36px rgba(43,75,255,.32)}
.v3-btn-primary:hover{background:#1e3be0}
.v3-btn-ghost{border-color:rgba(255,255,255,.28);color:var(--hero-text);background:rgba(255,255,255,.04)}
body.theme-b .v3-btn-ghost{border-color:#c9d3ea;background:#fff;color:var(--text)}
.v3-btn-ghost:hover{background:rgba(255,255,255,.1)}
body.theme-b .v3-btn-ghost:hover{background:#f2f5ff}
.v3-btn-light{background:#fff;color:#0b1533}
.v3-btn-outline-light{border-color:rgba(255,255,255,.5);color:#fff}
.v3-btn-small{min-height:44px;padding:0 16px;font-size:13px}
.v3-trust{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:32px;font-size:12.5px;color:var(--hero-muted)}
.v3-trust span{display:inline-flex;align-items:center;gap:7px}
.v3-trust i{width:6px;height:6px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
body.theme-b .v3-trust i{background:var(--brand);box-shadow:none}

/* 回答卡 */
.v3-hero-visual{position:relative}
.v3-answer{position:relative;background:linear-gradient(180deg,rgba(18,33,74,.94),rgba(8,18,46,.94));border:1px solid rgba(255,255,255,.14);border-radius:22px;padding:26px 26px 22px;box-shadow:0 40px 100px rgba(0,0,0,.45),inset 0 1px 0 rgba(255,255,255,.08)}
body.theme-b .v3-answer{background:#fff;border-color:var(--line);box-shadow:var(--shadow-lg)}
.v3-answer-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.12);font-family:var(--mono);font-size:11px;color:rgba(214,224,255,.62)}
body.theme-b .v3-answer-head{border-color:var(--line);color:var(--muted)}
.v3-live{display:inline-flex;align-items:center;gap:7px;color:#fff;font-family:var(--sans);font-weight:600;font-size:12px}
body.theme-b .v3-live{color:var(--text)}
.v3-live i{width:7px;height:7px;border-radius:50%;background:#35e08a;box-shadow:0 0 10px #35e08a}
.v3-answer-q{margin-top:18px;display:flex;align-items:center;gap:9px;font-size:14px;font-weight:700;color:#fff}
body.theme-b .v3-answer-q{color:var(--text)}
.v3-answer-q b{display:grid;place-items:center;width:22px;height:22px;border-radius:6px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.15);font-family:var(--mono);font-size:10px;font-weight:500;color:var(--cyan)}
body.theme-b .v3-answer-q b{background:#f2f5ff;border-color:var(--line);color:var(--brand)}
.v3-answer-text{margin:13px 0 0;font-size:15.5px;line-height:1.95;color:rgba(230,238,255,.86)}
body.theme-b .v3-answer-text{color:#3b4566}
.v3-answer-text mark{background:linear-gradient(transparent 56%,rgba(43,75,255,.55) 56%);color:#fff;font-weight:700;padding:0 1px}
body.theme-b .v3-answer-text mark{background:linear-gradient(transparent 56%,rgba(43,75,255,.16) 56%);color:var(--text)}
.v3-answer-text a{display:inline-grid;place-items:center;width:16px;height:16px;margin-left:2px;border-radius:4px;background:var(--brand);color:#fff;font-family:var(--mono);font-size:9px;vertical-align:3px}
.v3-sources{margin-top:16px;padding-top:12px;border-top:1px dashed rgba(255,255,255,.16);display:grid;gap:7px}
body.theme-b .v3-sources{border-color:var(--line)}
.v3-sources div{display:flex;gap:8px;font-size:12.5px;color:rgba(214,224,255,.6)}
body.theme-b .v3-sources div{color:var(--muted)}
.v3-sources b{font-family:var(--mono);font-weight:500;color:var(--cyan);font-size:11px}
body.theme-b .v3-sources b{color:var(--brand)}
.v3-sources a{color:rgba(230,238,255,.86);text-decoration:underline;text-decoration-color:rgba(255,255,255,.25);text-underline-offset:3px}
body.theme-b .v3-sources a{color:var(--text)}
.v3-sources a:hover{color:var(--cyan)}
.v3-answer-foot{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.v3-badge{display:inline-flex;padding:4px 9px;border-radius:999px;border:1px solid rgba(255,255,255,.18);font-family:var(--mono);font-size:10px;color:rgba(214,224,255,.66)}
body.theme-b .v3-badge{border-color:var(--line);color:var(--muted)}
.v3-badge-hot{border-color:rgba(255,138,96,.5);background:rgba(255,92,40,.12);color:#ffab8c}
body.theme-b .v3-badge-hot{border-color:rgba(216,67,28,.3);background:rgba(216,67,28,.06);color:#c8401f}
.v3-float{position:absolute;padding:12px 15px;border-radius:14px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);box-shadow:0 18px 40px rgba(0,0,0,.28);display:flex;flex-direction:column;gap:1px}
body.theme-b .v3-float{background:#fff;border-color:var(--line);box-shadow:var(--shadow-md)}
.v3-float b{font-size:15px;color:#fff}
body.theme-b .v3-float b{color:var(--text)}
.v3-float span{font-size:11px;color:rgba(214,224,255,.6)}
body.theme-b .v3-float span{color:var(--muted)}
.v3-float-a{right:-18px;top:-22px;transform:rotate(3deg)}
.v3-float-b{left:-26px;bottom:74px;transform:rotate(-3deg)}
.v3-platforms{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px;justify-content:flex-end}
.v3-platforms span{padding:5px 10px;border-radius:8px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);font-size:11px;color:rgba(214,224,255,.66)}
body.theme-b .v3-platforms span{background:#fff;border-color:var(--line);color:var(--muted)}

/* ---------- 指标 ---------- */
.v3-metrics{background:#fff;padding:0 0 12px}
.v3-metrics-grid{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line)}
.v3-metrics-grid div{padding:34px 28px;border-right:1px solid var(--line)}
.v3-metrics-grid div:first-child{padding-left:0}
.v3-metrics-grid div:last-child{border-right:0}
.v3-metrics-grid b{display:block;font-size:clamp(36px,4vw,54px);line-height:1;font-weight:800;letter-spacing:-.03em;background:linear-gradient(90deg,#2b4bff,#00a6d6);-webkit-background-clip:text;background-clip:text;color:transparent}
.v3-metrics-grid b small{font-size:14px;font-weight:700;margin-left:4px}
.v3-metrics-grid span{display:block;margin-top:10px;font-size:13px;color:var(--muted)}
.v3-metrics-note{padding:14px 0 22px;font-size:11.5px;color:var(--muted);border-bottom:1px solid var(--line)}

/* ---------- 通用区块 ---------- */
.v3-section{padding:100px 0;background:#fff}
.v3-soft{background:var(--soft)}
.v3-head{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(320px,.75fr);gap:64px;align-items:end;margin-bottom:48px}
.v3-label{display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:11.5px;letter-spacing:.05em;color:var(--brand);font-weight:500}
.v3-label::before{content:"";width:18px;height:2px;background:currentColor;border-radius:2px}
.v3-label.light{color:#8fb2ff}
.v3-head h2,.v3-product h2,.v3-network-grid h2,.v3-cta h2{margin:14px 0 0;font-size:clamp(30px,3.4vw,44px);line-height:1.24;letter-spacing:-.02em;font-weight:800;color:var(--text)}
.v3-head p,.v3-network-copy{margin:0;font-size:14.5px;line-height:1.9;color:var(--muted)}
.v3-head h2{max-width:760px}

/* 公司 4 卡 + 照片 */
.v3-company-grid{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(300px,.55fr);gap:20px;align-items:stretch}
.v3-photo{margin:0;position:relative;border-radius:22px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-sm);min-height:260px}
.v3-photo img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.v3-photo figcaption{position:absolute;left:14px;bottom:12px;padding:4px 8px;border-radius:6px;background:rgba(7,13,36,.62);color:rgba(255,255,255,.8);font-size:10px}
.v3-feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.v3-feature{background:var(--card-bg);border:1px solid var(--card-line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s}
.v3-feature:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.v3-icon{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#2b4bff,#00a6d6);color:#fff;font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.02em;box-shadow:0 8px 18px rgba(43,75,255,.24)}
.v3-feature h3{margin:16px 0 0;font-size:18px;font-weight:700}
.v3-feature p{margin:8px 0 0;font-size:13px;line-height:1.8;color:var(--muted)}

/* 服务卡 */
.v3-card-media{position:relative;margin:-30px -30px 22px;border-radius:22px 22px 0 0;overflow:hidden;aspect-ratio:16/9;background:#eef2ff}
.v3-card-media img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.v3-media-note{position:absolute;left:10px;bottom:9px;padding:3px 7px;border-radius:5px;background:rgba(7,13,36,.55);color:rgba(255,255,255,.8);font-size:10px}
.v3-card:hover .v3-card-media img{transform:scale(1.04)}
.v3-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.v3-card{background:var(--card-bg);border:1px solid var(--card-line);border-radius:22px;padding:30px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;transition:transform .22s,box-shadow .22s}
.v3-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.v3-card-icon{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;font-size:20px;color:#fff;font-weight:700}
.v3-icon-blue{background:linear-gradient(135deg,#2b4bff,#5b7cff);box-shadow:0 10px 22px rgba(43,75,255,.26)}
.v3-icon-cyan{background:linear-gradient(135deg,#00a6d6,#6fe7ff);box-shadow:0 10px 22px rgba(0,166,214,.22)}
.v3-icon-violet{background:linear-gradient(135deg,#6b4bff,#b36bff);box-shadow:0 10px 22px rgba(107,75,255,.22)}
.v3-card-no{display:block;margin-top:18px;font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.06em}
.v3-card h3{margin:8px 0 0;font-size:23px;font-weight:800;letter-spacing:-.01em}
.v3-card p{margin:9px 0 0;font-size:13.5px;line-height:1.85;color:var(--muted)}
.v3-card ul{margin:16px 0 0;padding-left:1.1em;font-size:12.5px;line-height:2;color:#3b4566}
.v3-card a{margin-top:18px;display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--brand)}
.v3-card a:hover{text-decoration:underline;text-underline-offset:4px}

/* 四步 */
.v3-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.v3-step{position:relative;padding:28px 0 0;border-top:2px solid var(--line)}
.v3-step b{position:absolute;top:-17px;left:0;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:var(--brand);color:#fff;font-family:var(--mono);font-size:11px;font-weight:600;box-shadow:0 8px 18px rgba(43,75,255,.28)}
.v3-step h3{margin:10px 0 0;font-size:19px;font-weight:700}
.v3-step p{margin:8px 0 0;font-size:13px;line-height:1.85;color:var(--muted)}

/* ---------- 产品 ---------- */
.v3-product{position:relative;overflow:hidden;background:linear-gradient(160deg,#070d24 0%,#0b1a44 60%,#102866 100%);color:#fff;padding:100px 0}
.v3-product::before{content:"";position:absolute;width:700px;height:700px;right:-160px;top:-240px;border-radius:50%;background:radial-gradient(circle,rgba(43,75,255,.5),transparent 70%);filter:blur(60px)}
.v3-product-grid{position:relative;display:grid;grid-template-columns:minmax(0,.9fr) minmax(440px,1.1fr);gap:64px;align-items:center}
.v3-product h2{margin:14px 0 0;color:#fff;font-size:clamp(32px,3.6vw,48px)}
.v3-product-copy p{margin:18px 0 0;font-size:14.5px;line-height:1.9;color:rgba(220,230,255,.72)}
.v3-product-metrics{display:flex;gap:34px;margin:28px 0 0}
.v3-product-metrics b{display:block;font-size:30px;font-weight:800;letter-spacing:-.02em;color:#fff}
.v3-product-metrics span{display:block;font-size:11.5px;color:rgba(220,230,255,.58);margin-top:2px}
.v3-product-copy .v3-btn{margin-top:28px}
.v3-product-visual{position:relative}
.v3-browser{border-radius:18px;overflow:hidden;box-shadow:0 50px 120px rgba(0,0,0,.5);border:1px solid rgba(255,255,255,.14);background:#fff}
.v3-browser-top{height:34px;display:flex;align-items:center;gap:6px;padding:0 12px;background:#0e1733;border-bottom:1px solid rgba(255,255,255,.1)}
.v3-browser-top i{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.22)}
.v3-browser-top span{margin-left:10px;font-family:var(--mono);font-size:10px;color:rgba(255,255,255,.45)}
.v3-browser img{width:100%;height:auto;display:block}
.v3-product-badge{position:absolute;left:-22px;bottom:-18px;background:#fff;color:#0b1533;border-radius:14px;padding:13px 16px;box-shadow:0 20px 50px rgba(0,0,0,.3);display:flex;flex-direction:column;gap:2px}
.v3-product-badge b{font-size:14px}
.v3-product-badge span{font-size:11px;color:var(--muted)}

/* ---------- 城市网络 ---------- */
.v3-network-visual{position:relative;border-radius:26px;overflow:hidden;background:#0b1533;min-height:440px;border:1px solid rgba(255,255,255,.08);box-shadow:var(--shadow-md)}
.v3-network-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.38}
.v3-network-visual::after{content:"";position:absolute;inset:0;background:linear-gradient(160deg,rgba(7,13,36,.25),rgba(7,13,36,.82))}
.v3-network-visual svg{position:relative;z-index:2;display:block;width:100%;height:100%;padding:26px}
.v3-photo-credit{position:absolute;right:14px;bottom:12px;z-index:3;font-size:10px;color:rgba(255,255,255,.55);background:rgba(7,13,36,.6);padding:3px 7px;border-radius:6px}
.v3-network-visual .v3-net-labels text{fill:rgba(255,255,255,.75)}
.v3-network-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(420px,.9fr);gap:64px;align-items:center}
.v3-network-stats{display:grid;grid-template-columns:1fr 1fr;gap:16px 30px;margin:26px 0 0}
.v3-network-stats b{display:block;font-size:30px;font-weight:800;letter-spacing:-.02em;color:var(--brand)}
.v3-network-stats span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.v3-network-grid .v3-btn{margin-top:26px}
.v3-network-visual svg{width:100%;height:auto;overflow:visible}
.v3-net-labels text{font-family:var(--sans);font-size:12px;fill:var(--muted);font-weight:600}
.v3-net-dots circle{filter:drop-shadow(0 0 8px rgba(43,75,255,.55))}
.v3-net-lines path{stroke-dasharray:4 5}

/* ---------- 案例 ---------- */
.v3-case-media{margin:-30px -30px 20px;border-radius:22px 22px 0 0;overflow:hidden;aspect-ratio:16/9;background:#eef2ff;border-bottom:1px solid var(--line)}
.v3-case-media img{width:100%;height:100%;object-fit:cover;object-position:top center;display:block;transition:transform .5s ease}
.v3-case:hover .v3-case-media img{transform:scale(1.03)}
.v3-cases{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.v3-case{position:relative;overflow:hidden;background:var(--card-bg);border:1px solid var(--card-line);border-radius:22px;padding:30px;box-shadow:var(--shadow-sm);transition:transform .22s,box-shadow .22s}
.v3-case::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#2b4bff,#6fe7ff)}
.v3-case:hover{transform:translateY(-6px);box-shadow:var(--shadow-md)}
.v3-case-tag{display:inline-flex;padding:5px 9px;border-radius:7px;background:#f1f4ff;color:var(--brand);font-size:11px;font-weight:700}
.v3-case h3{margin:14px 0 0;font-size:24px;font-weight:800}
.v3-case p{margin:8px 0 0;font-size:13px;line-height:1.8;color:var(--muted)}
.v3-case-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0 0;padding-top:16px;border-top:1px solid var(--line)}
.v3-case-metrics b{display:block;font-size:20px;font-weight:800;color:var(--brand);letter-spacing:-.01em}
.v3-case-metrics span{display:block;font-size:10.5px;color:var(--muted);margin-top:2px}
.v3-case a{display:inline-flex;margin-top:18px;font-size:13px;font-weight:700;color:var(--brand)}

/* ---------- 资源 ---------- */
.v3-insights{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.v3-insight{background:var(--card-bg);border:1px solid var(--card-line);border-radius:20px;padding:26px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column}
.v3-insight:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.v3-insight time{font-family:var(--mono);font-size:10.5px;color:var(--brand)}
.v3-insight h3{margin:12px 0 0;font-size:18px;line-height:1.45;font-weight:700}
.v3-insight p{margin:8px 0 0;font-size:12.5px;line-height:1.8;color:var(--muted);flex:1}
.v3-insight span{margin-top:16px;font-size:12px;font-weight:700;color:var(--brand)}

/* ---------- CTA ---------- */
.v3-cta-band{position:relative;overflow:hidden;background:linear-gradient(120deg,rgba(43,75,255,.94),rgba(91,59,255,.9) 58%,rgba(0,166,214,.88)),url(/assets/img/city-night.webp) center/cover no-repeat;color:#fff;padding:86px 0}
.v3-cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(255,255,255,.18),transparent 45%)}
.v3-cta-grid{position:relative;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(300px,.8fr);gap:60px;align-items:center}
.v3-cta-band h2{color:#fff;font-size:clamp(32px,3.6vw,48px)}
.v3-cta-band p{margin:16px 0 0;max-width:640px;font-size:14.5px;line-height:1.9;color:rgba(255,255,255,.8)}
.v3-cta-actions{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.v3-cta-phone{font-family:var(--mono);font-size:12px;color:rgba(255,255,255,.72);margin-top:4px}

/* ---------- 页脚 ---------- */
.v3-footer{background:var(--footer-bg);color:var(--footer-text);padding:56px 0 24px}
.v3-footer-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:44px}
.v3-footer .v3-brand{font-size:20px}
.v3-footer .v3-brand img{filter:brightness(0) invert(1)}
.v3-footer-grid p{margin:14px 0 0;max-width:360px;font-size:12.5px;line-height:1.8;color:var(--footer-muted)}
.v3-footer-grid b{display:block;font-size:12.5px;margin-bottom:12px;color:#fff}
.v3-footer-grid div a{display:block;padding:4px 0;font-size:12.5px;color:var(--footer-muted)}
.v3-footer-grid div a:hover{color:#fff}
.v3-footer-bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:40px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);font-size:11px;color:var(--footer-muted)}

/* ---------- 主题切换 ---------- */
.v3-switcher{position:fixed;right:18px;bottom:18px;z-index:100;display:flex;gap:4px;padding:4px;border-radius:12px;background:rgba(11,21,51,.88);box-shadow:0 12px 30px rgba(0,0,0,.25)}
.v3-switcher button{border:0;background:transparent;color:rgba(255,255,255,.6);font-size:12px;padding:7px 12px;border-radius:8px;font-weight:600}
.v3-switcher button.on{background:#fff;color:#0b1533}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .v3-hero-grid,.v3-product-grid,.v3-network-grid{grid-template-columns:1fr;gap:44px}
  .v3-hero{padding-top:120px}
  .v3-hero-visual{max-width:640px}
  .v3-float-a{right:0}
  .v3-float-b{left:0}
  .v3-head,.v3-cta-grid{grid-template-columns:1fr;gap:24px}
  .v3-metrics-grid{grid-template-columns:1fr 1fr}
  .v3-metrics-grid div:nth-child(2){border-right:0}
  .v3-metrics-grid div:nth-child(3),.v3-metrics-grid div:nth-child(4){border-top:1px solid var(--line)}
  .v3-company-grid{grid-template-columns:1fr}
  .v3-feature-grid,.v3-cards,.v3-cases,.v3-insights{grid-template-columns:1fr 1fr}
  .v3-steps{grid-template-columns:1fr 1fr}
  .v3-footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .v3-shell{width:calc(100% - 36px)}
  .v3-links{display:none}
  .v3-burger{display:block}
  .v3-nav{height:68px}
  .v3-hero{padding:100px 0 64px}
  .v3-hero h1{font-size:clamp(38px,9vw,52px)}
  .v3-hero-lead{font-size:15px}
  .v3-hero-visual{max-width:100%}
  .v3-float{display:none}
  .v3-platforms{justify-content:flex-start}
  .v3-section{padding:68px 0}
  .v3-product{padding:68px 0}
  .v3-metrics-grid div{padding:24px 16px}
  .v3-metrics-grid div:first-child{padding-left:16px}
  .v3-company-grid,.v3-feature-grid,.v3-cards,.v3-cases,.v3-insights,.v3-steps{grid-template-columns:1fr}
  .v3-photo{min-height:220px}
  .v3-footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .v3-footer-grid>div:first-child{grid-column:1/-1}
  .v3-cta-band{padding:64px 0}
  .v3-switcher{right:12px;bottom:12px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none !important;animation:none !important}
}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}

/* ---------- 全站补充：导航态 / 移动菜单 / FAQ ---------- */
.v3-links a.active{opacity:1;color:var(--brand);font-weight:700;position:relative}
body.theme-a .v3-links a.active{color:#fff}
.v3-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-27px;height:2px;background:var(--brand);border-radius:2px}
body.theme-a .v3-links a.active::after{background:var(--cyan)}

@media (max-width:760px){
  .v3-burger{display:block}
  .v3-menu-open .v3-links{display:flex;position:fixed;left:0;right:0;top:68px;bottom:0;z-index:60;flex-direction:column;gap:0;padding:12px 18px 40px;background:#fff;overflow:auto;border-top:1px solid var(--line)}
  .v3-menu-open .v3-links a{padding:15px 0;border-bottom:1px solid var(--line);font-size:16px}
  .v3-menu-open .v3-links a.active::after{display:none}
  .v3-menu-open .v3-burger{background:#f2f5ff}
}

/* 首页 FAQ */
.v3-faq{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-items:start}
.v3-faq-item{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px 20px;box-shadow:var(--shadow-sm)}
.v3-faq-item summary{display:flex;justify-content:space-between;gap:16px;cursor:pointer;font-size:14.5px;font-weight:700;list-style:none}
.v3-faq-item summary::-webkit-details-marker{display:none}
.v3-faq-item summary::after{content:"+";font-family:var(--mono);color:var(--brand);font-weight:500}
.v3-faq-item[open] summary::after{content:"−"}
.v3-faq-item p{margin:10px 0 0;font-size:12.8px;line-height:1.85;color:var(--muted)}
@media (max-width:760px){.v3-faq{grid-template-columns:1fr}}
/* ---------- 2026-10-24 · 答案先行 / 引用出处 / 问题式标题 ---------- */
.v3-answer-first{max-width:940px}
.v3-answer-first h2{margin:14px 0 0;font-size:clamp(28px,3.2vw,42px);line-height:1.28;letter-spacing:-.02em;font-weight:800;color:var(--text)}
.v3-answer-first p{margin:18px 0 0;font-size:16.5px;line-height:1.95;color:var(--muted)}
.v3-answer-first p strong{color:var(--text)}
.v3-cites{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.v3-cite{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 22px 18px;box-shadow:var(--shadow-sm)}
.v3-cite blockquote{margin:0 0 12px;font-size:14.5px;line-height:1.8;color:var(--text)}
.v3-cite cite{font-style:normal;font-size:11.5px;line-height:1.7;color:var(--muted)}
.v3-cite cite a{color:var(--brand);font-weight:600}
.v3-faq-item summary h3{margin:0;font:inherit;line-height:inherit;flex:1}
@media (max-width:760px){.v3-cites{grid-template-columns:1fr}.v3-answer-first p{font-size:15.5px}}
/* ---------- 2026-10-24 · 导航居中 + 下拉子菜单 ---------- */
.v3-nav{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:20px}
.v3-brand{justify-self:start}
.v3-nav-actions{justify-self:end;margin-left:0}
.v3-links{justify-content:center;align-items:center;gap:24px;opacity:1}
.v3-links>a,.v3-menu>a{opacity:.8;transition:opacity .18s,color .18s}
.v3-links>a:hover,.v3-menu>a:hover,.v3-links>a.active,.v3-menu>a.active{opacity:1}
.v3-menu{position:relative;display:flex;align-items:center}
.v3-menu>a{display:inline-flex;align-items:center;gap:4px;white-space:nowrap}
.v3-caret{font-size:10px;opacity:.55;transform:translateY(-1px)}
.v3-sub{position:absolute;top:calc(100% + 14px);left:50%;transform:translate(-50%,6px);min-width:210px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;pointer-events:none;transition:opacity .18s,transform .18s,visibility .18s;z-index:80}
.v3-sub a{display:block;padding:9px 12px;border-radius:8px;font-size:13px;font-weight:500;color:var(--text);white-space:nowrap}
.v3-sub a:hover{background:var(--soft);color:var(--brand)}
.v3-menu:hover .v3-sub,.v3-menu:focus-within .v3-sub{opacity:1;visibility:visible;pointer-events:auto;transform:translate(-50%,0)}
@media (max-width:900px){
  .v3-nav{display:flex;height:68px;justify-content:space-between}
  .v3-links{display:none}
  .v3-burger{display:block}
}
@media (max-width:900px){
  .v3-menu-open .v3-links{display:flex;position:fixed;left:0;right:0;top:68px;bottom:0;z-index:60;flex-direction:column;align-items:stretch;gap:0;padding:12px 18px 40px;background:#fff;overflow:auto;border-top:1px solid var(--line);opacity:1}
  .v3-menu-open .v3-links>a,.v3-menu-open .v3-menu>a{padding:15px 0;border-bottom:1px solid var(--line);font-size:16px;opacity:1;display:flex;justify-content:space-between}
  .v3-menu-open .v3-menu{display:block;width:100%}
  .v3-menu-open .v3-sub{position:static;transform:none;opacity:1;visibility:visible;pointer-events:auto;min-width:0;padding:4px 0 10px;background:transparent;border:0;box-shadow:none;display:grid;grid-template-columns:1fr 1fr;gap:0 12px}
  .v3-menu-open .v3-sub a{padding:9px 0;font-size:13.5px;color:var(--muted);border-bottom:1px dashed var(--line);white-space:normal}
  .v3-menu-open .v3-caret{display:none}
}