:root{
  --navy-950:#071a2f;
  --navy-900:#081C33;
  --navy-800:#0A2540;
  --navy-700:#123561;
  --navy-600:#16437A;
  --navy-500:#2E6BB0;
  --navy-200:#B5D4F4;
  --navy-100:#E0EDFA;
  --navy-50:#F0F6FC;
  --cyan:#00A6C0;
  --cyan-soft:#EFFBFC;
  --green:#16A34A;
  --green-soft:#DCFCE7;
  --amber:#F59E0B;
  --amber-soft:#FEF3C7;
  --ink:#0F172A;
  --gray-600:#475569;
  --gray-500:#64748B;
  --gray-400:#94A3B8;
  --line:#E2E8F0;
  --bg:#F8FAFC;
  --white:#ffffff;
  --font-cn:"Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-en:"Chakra Petch","Source Han Sans SC",sans-serif;
  --maxw:1200px;
  --radius:14px;
  --shadow:0 20px 50px -20px rgba(7,26,47,.18);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font-cn);color:var(--ink);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
.container{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.en{font-family:var(--font-en);letter-spacing:.04em}
::selection{background:var(--cyan);color:#fff}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{line-height:1.3}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:18px 0;transition:background .35s,padding .35s,box-shadow .35s}
.nav.scrolled{background:rgba(7,26,47,.92);backdrop-filter:blur(14px);padding:12px 0;box-shadow:0 4px 30px rgba(0,0,0,.25)}
.nav .container{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none}
.logo-img{height:34px;width:auto;display:block}
.logo-name{color:#fff;font-size:21px;font-weight:700;letter-spacing:.05em;line-height:1.1}
.logo-name .en{display:block;font-size:10px;font-weight:500;color:var(--cyan);letter-spacing:.24em;margin-top:2px}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{color:rgba(255,255,255,.82);text-decoration:none;font-size:15px;position:relative;transition:color .25s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--cyan);transition:width .25s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{position:relative;overflow:hidden;display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#FBBF24,#F59E0B);color:var(--navy-900);font-weight:700;font-size:14px;padding:11px 22px;border-radius:9px;text-decoration:none;transition:transform .25s,box-shadow .25s;box-shadow:0 8px 20px -8px rgba(245,158,11,.6)}
.nav-cta::after{content:"";position:absolute;top:0;left:-80%;width:45%;height:100%;background:linear-gradient(120deg,transparent,rgba(255,255,255,.5),transparent);transform:skewX(-22deg);transition:left .6s ease;pointer-events:none}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 14px 30px -10px rgba(245,158,11,.75)}
.nav-cta:hover::after{left:125%}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.burger span{width:24px;height:2px;background:#fff;display:block;transition:.3s}

/* ===== 案例页头 ===== */
.page-hero{background:var(--navy-900);color:#fff;padding:148px 0 66px;position:relative;overflow:hidden}
.page-hero .grid-bg{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:46px 46px;mask-image:radial-gradient(ellipse 80% 80% at 50% 0%,#000 30%,transparent 75%)}
.page-hero .ring{position:absolute;right:-120px;top:-60px;width:420px;height:420px;opacity:.18}
.page-hero .container{position:relative;z-index:2}
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:13px;color:var(--cyan);letter-spacing:.22em;text-transform:uppercase;margin-bottom:20px}
.kicker::before{content:"";width:34px;height:1px;background:var(--cyan)}
.page-hero h1{font-size:46px;font-weight:700;letter-spacing:.01em;margin-bottom:16px}
.page-hero h1 .accent{color:var(--cyan)}
.page-hero p{font-size:16px;color:rgba(255,255,255,.7);max-width:660px}

/* ===== 数据中心页签 ===== */
.data-tabs{background:var(--white);border-bottom:1px solid var(--line);position:sticky;top:62px;z-index:40}
.data-tabs .container{display:flex;gap:6px}
.data-tabs .tab{padding:15px 24px;font-size:15px;font-weight:600;color:var(--gray-500);border-bottom:3px solid transparent;margin-bottom:-1px;transition:color .2s,border-color .2s;text-decoration:none;white-space:nowrap}
.data-tabs .tab:hover{color:var(--navy-700)}
.data-tabs .tab.active{color:var(--navy-900);border-bottom-color:var(--cyan)}

/* ===== 工具条 ===== */
.toolbar{display:flex;gap:16px;align-items:center;flex-wrap:wrap;margin:46px 0 30px}
.search{flex:1;min-width:230px;position:relative}
.search input{width:100%;padding:12px 16px 12px 44px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:var(--font-cn);background:var(--white);color:var(--ink);outline:none;transition:border-color .2s,box-shadow .2s}
.search input:focus{border-color:var(--cyan);box-shadow:0 0 0 3px var(--cyan-soft),0 8px 20px -12px rgba(0,166,192,.35)}
.search input::placeholder{color:var(--gray-400)}
.search svg{position:absolute;left:15px;top:50%;transform:translateY(-50%);width:18px;height:18px;stroke:var(--gray-400);fill:none;transition:stroke .2s}
.search:focus-within svg{stroke:var(--cyan)}
.filter{position:relative}
.filter select{padding:12px 40px 12px 16px;border:1px solid var(--line);border-radius:10px;font-size:14px;font-family:var(--font-cn);background:var(--white);color:var(--ink);cursor:pointer;outline:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' stroke='%2364748B' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}
.filter select:focus{border-color:var(--cyan)}
.count{margin-left:auto;font-size:14px;color:var(--gray-500);white-space:nowrap}

/* ===== 案例网格 ===== */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding-bottom:80px}
.case-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .3s,box-shadow .3s,border-color .3s;display:flex;flex-direction:column;position:relative}
.case-card:hover{transform:translateY(-6px);box-shadow:0 22px 46px -20px rgba(7,26,47,.22);border-color:var(--navy-200)}
.case-thumb{height:184px;overflow:hidden;background:var(--navy-50);position:relative}
.case-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.case-card:hover .case-thumb img{transform:scale(1.06)}
.case-thumb::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(7,26,47,.22),transparent 45%);opacity:0;transition:opacity .3s}
.case-card:hover .case-thumb::after{opacity:1}
.case-body{padding:22px;display:flex;flex-direction:column;flex:1}
.case-meta{font-size:12.5px;color:var(--gray-500);margin-bottom:10px;display:flex;gap:12px;flex-wrap:wrap}
.case-meta .src{color:var(--cyan);font-weight:600}
.case-body h3{font-size:17px;font-weight:700;color:var(--navy-900);line-height:1.45;margin-bottom:10px;transition:color .25s}
.case-card:hover .case-body h3{color:var(--navy-600)}
.case-excerpt{font-size:14px;color:var(--gray-600);line-height:1.7;flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.case-link{display:inline-flex;align-items:center;gap:6px;margin-top:18px;font-size:14px;color:var(--navy-600);font-weight:600}
.case-link .ar{transition:transform .2s}
.case-card:hover .case-link .ar{transform:translateX(4px)}
.case-card:hover .case-link{color:var(--cyan)}
.empty{grid-column:1/-1;text-align:center;color:var(--gray-500);padding:70px 0;font-size:15px}

/* ===== 详情页 ===== */
.article-hero{background:var(--navy-900);color:#fff;padding:138px 0 58px;position:relative;overflow:hidden}
.article-hero .grid-bg{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:46px 46px;mask-image:radial-gradient(ellipse 90% 70% at 20% 0%,#000 30%,transparent 75%)}
.article-hero .container{position:relative;z-index:2}
.back{display:inline-flex;align-items:center;gap:8px;color:rgba(255,255,255,.7);font-size:14px;margin-bottom:22px;transition:color .2s}
.back:hover{color:var(--cyan)}
.article-hero h1{font-size:40px;font-weight:700;max-width:860px;line-height:1.32;margin-bottom:18px}
.article-meta{display:flex;gap:26px;flex-wrap:wrap;font-size:14px;color:rgba(255,255,255,.65)}
.article-meta b{color:#fff;font-weight:600}
.article-cover{max-width:var(--maxw);margin:-46px auto 0;padding:0 32px;position:relative;z-index:3}
.article-cover img{width:100%;max-height:440px;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow);background:var(--navy-50)}
.article-body{max-width:820px;margin:0 auto;padding:50px 32px 70px}
.article-body p{font-size:16px;color:var(--ink);margin-bottom:22px;line-height:1.95}
.article-body h3.sub{font-size:20px;font-weight:700;color:var(--navy-900);margin:38px 0 14px;padding-left:14px;border-left:3px solid var(--cyan);line-height:1.5}
.article-gallery{margin:34px 0}
.article-gallery img{width:100%;border-radius:12px;margin-bottom:16px;border:1px solid var(--line)}
.article-foot{max-width:820px;margin:0 auto;padding:0 32px 90px}
.src-note{font-size:13px;color:var(--gray-500);border-top:1px solid var(--line);padding-top:22px;line-height:1.8}
.related{background:var(--bg);padding:70px 0}
.related h2{font-size:28px;font-weight:700;color:var(--navy-900);margin-bottom:32px}

/* ===== 页脚 ===== */
.footer{background:var(--navy-950);color:rgba(255,255,255,.72);padding:70px 0 36px}
.footer .container{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:40px}
.footer-brand .logo{margin-bottom:18px}
.footer-brand p{font-size:14px;color:rgba(255,255,255,.55);max-width:300px;line-height:1.9}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:18px;font-weight:600}
.footer-col a{display:block;color:rgba(255,255,255,.6);font-size:14px;margin-bottom:12px;transition:color .2s}
.footer-col a:hover{color:var(--cyan)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:50px;padding-top:24px;display:flex;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.45);flex-wrap:wrap;gap:10px}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .case-grid{grid-template-columns:repeat(2,1fr)}
  .footer .container{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav-links{position:fixed;top:62px;right:0;background:var(--navy-900);flex-direction:column;padding:24px;gap:18px;width:210px;transform:translateX(120%);transition:transform .3s;border-radius:0 0 0 12px;box-shadow:-10px 20px 40px rgba(0,0,0,.3)}
  .nav-links.open{transform:translateX(0)}
  .burger{display:flex}
  .case-grid{grid-template-columns:1fr}
  .page-hero h1{font-size:34px}
  .article-hero h1{font-size:27px}
  .footer .container{grid-template-columns:1fr}
  .count{margin-left:0}
}