/* ============================================================
   大谦智擎官网 · 公开层样式
   与蓝蜂 OPC 平台（ai3399.top）同一套设计令牌，保证两个站是一家人：
     深色科技底 070B14 + 蓝 2E6BFF + 青 22D3EE + 金 FFC43D
   大谦智擎品牌本身是「蓝 + 橙」双色（无限环 Logo），
   所以本站把橙 FF9F43 也提出来当第四色，用在金色旁边做呼应。
   ============================================================ */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#070B14;--panel:#0D1526;--panel2:#111C33;--panel3:#16233F;
  --line:rgba(46,107,255,.18);--line2:rgba(46,107,255,.34);
  --tx:#E8EEF9;--tx2:#93A4C0;--tx3:#7C8DA8;
  --blue:#2E6BFF;--cyan:#22D3EE;--gold:#FFC43D;--orange:#FF9F43;
  --green:#22C55E;--r:16px;
  --toph:70px;
}
html{scroll-behavior:smooth;scroll-padding-top:var(--toph)}
html,body{background:var(--bg);overflow-x:hidden}
body{color:var(--tx);font:14px/1.7 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;min-height:100vh;padding-top:var(--toph);
  background-image:
    radial-gradient(1100px 640px at 12% -8%,rgba(46,107,255,.20),transparent 62%),
    radial-gradient(900px 540px at 90% 2%,rgba(34,211,238,.11),transparent 60%),
    radial-gradient(760px 460px at 50% 110%,rgba(255,196,61,.06),transparent 62%);
  background-attachment:fixed}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}
.mono{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
a{color:var(--cyan)}
img{max-width:100%}
.only-pc{display:initial}
@media(max-width:760px){.only-pc{display:none}}

/* ---------- 顶栏 ---------- */
.top{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(7,11,20,.86);backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(46,107,255,.14)}
.top-in{max-width:1300px;margin:0 auto;padding:11px 22px;display:flex;align-items:center;gap:14px}
/* 品牌标：logo 图标 + 「大谦智擎」四个字横排等高（和课程长图一致），不加副标题。
   下同页脚 .ft-logo，两处共用同一套比例。 */
.brand{display:flex;align-items:center;gap:11px;margin-inline-end:auto;flex:0 0 auto;
  text-decoration:none;color:inherit}
.brand img{height:26px;width:auto;flex:none;display:block;object-fit:contain}
.brand b{font-size:29px;font-weight:600;letter-spacing:.05em;line-height:1;color:var(--tx);white-space:nowrap}
.nav{display:flex;gap:1px;align-items:center;flex:none}
.nav a{position:relative;text-decoration:none;color:var(--tx2);font-size:13px;padding:8px 9px;border-radius:9px;
  white-space:nowrap;transition:color .2s,background .2s}
.nav a:hover{color:var(--tx);background:rgba(46,107,255,.10)}
.nav a.on{color:var(--cyan)}
.nav a.ext::after{content:"";display:inline-block;width:5px;height:5px;margin-left:4px;vertical-align:1px;
  border-right:1.5px solid var(--tx3);border-top:1.5px solid var(--tx3);transform:rotate(45deg)}

/* ---------- 顶栏「主营业务」下拉（三个业务合并成一个入口） ---------- */
.nav .hasul{position:relative;display:flex;align-items:center}
.nav .navlbl{display:inline-flex;align-items:center;gap:5px;cursor:pointer;color:var(--tx2);
  font-size:13px;padding:8px 9px;border-radius:9px;white-space:nowrap;transition:color .2s,background .2s}
.nav .hasul:hover .navlbl,.nav .hasul:focus-within .navlbl{color:var(--tx);background:rgba(46,107,255,.10)}
.nav .hasul.on .navlbl{color:var(--cyan)}
.nav .car{width:5px;height:5px;flex:none;margin-top:-3px;border-right:1.5px solid currentColor;
  border-bottom:1.5px solid currentColor;transform:rotate(45deg);transition:transform .2s}
.nav .hasul:hover .car,.nav .hasul:focus-within .car{transform:rotate(225deg);margin-top:3px}
.nav .ul{position:absolute;top:100%;left:50%;transform:translateX(-50%);padding-top:11px;
  opacity:0;visibility:hidden;transition:opacity .18s,visibility .18s;z-index:70}
.nav .ul>div{min-width:194px;display:flex;flex-direction:column;gap:1px;padding:7px;border-radius:14px;
  background:rgba(10,16,29,.98);backdrop-filter:blur(18px);border:1px solid var(--line2);
  box-shadow:0 20px 48px rgba(0,0,0,.55)}
.nav .ul a{display:block;padding:9px 12px;border-radius:10px;font-size:13.5px;color:var(--tx2);
  white-space:nowrap;transition:background .15s,color .15s}
.nav .ul a:hover,.nav .ul a.on{background:rgba(46,107,255,.14);color:var(--tx)}
.nav .hasul:hover .ul,.nav .hasul:focus-within .ul{opacity:1;visibility:visible}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;text-decoration:none;cursor:pointer;
  border:none;font:inherit;font-size:13px;font-weight:500;padding:10px 18px;border-radius:11px;
  transition:transform .2s,box-shadow .2s,border-color .2s,background .2s;white-space:nowrap}
.btn-pri{color:#fff;background:linear-gradient(135deg,var(--blue),#1F4FD8);box-shadow:0 6px 22px rgba(46,107,255,.36)}
.btn-pri:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(46,107,255,.5)}
.btn-gold{color:#141414;background:linear-gradient(135deg,var(--gold),#F0A819);box-shadow:0 6px 22px rgba(255,196,61,.28)}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(255,196,61,.4)}
.btn-ghost{color:var(--tx);background:rgba(46,107,255,.08);border:1px solid var(--line2)}
.btn-ghost:hover{border-color:rgba(34,211,238,.55);background:rgba(34,211,238,.08);transform:translateY(-2px)}
.btn:active{transform:translateY(0) scale(.985)}
.btn-sm{padding:8px 14px;font-size:12.5px;border-radius:10px}
.btn-row{display:flex;gap:12px;flex-wrap:wrap}

/* 顶栏自适应：挤不下就收导航进汉堡 */
@media(max-width:1399px){
  .nav{display:none}
}
.navsw{display:none;position:relative;flex:none}
.navsw>summary{list-style:none;cursor:pointer;width:38px;height:38px;border-radius:10px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  border:1px solid var(--line);background:rgba(46,107,255,.06);transition:border-color .2s,background .2s}
.navsw>summary::-webkit-details-marker{display:none}
.navsw>summary i{display:block;width:17px;height:2px;border-radius:2px;background:var(--tx2);
  transition:transform .2s,opacity .2s,background .2s}
.navsw>summary:hover{border-color:var(--line2)}
.navsw[open]>summary{border-color:var(--line2);background:rgba(46,107,255,.13)}
.navsw[open]>summary i{background:var(--cyan)}
.navsw[open]>summary i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.navsw[open]>summary i:nth-child(2){opacity:0}
.navsw[open]>summary i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.navsw-p{position:absolute;top:calc(100% + 12px);inset-inline-end:0;z-index:60;min-width:228px;
  display:flex;flex-direction:column;gap:1px;padding:7px;border-radius:14px;
  background:rgba(10,16,29,.98);backdrop-filter:blur(18px);
  border:1px solid var(--line2);box-shadow:0 20px 48px rgba(0,0,0,.55)}
.navsw-p a{display:block;padding:10px 13px;border-radius:10px;text-decoration:none;
  font-size:14px;color:var(--tx2);white-space:nowrap;transition:background .15s,color .15s}
.navsw-p a:hover{background:rgba(46,107,255,.14);color:var(--tx)}
.navsw-p a.on{color:var(--cyan);background:rgba(34,211,238,.1)}
.navsw-p .mgrp{display:block;padding:11px 13px 4px;font-size:11.5px;letter-spacing:.8px;color:var(--tx3)}
.navsw-p a.leaf{padding-inline-start:22px}
.navsw-p .sep{height:1px;background:var(--line);margin:6px 8px}
@media(max-width:1399px){.navsw{display:block}}
@media(max-width:820px){
  .top-in{gap:10px;padding:9px 14px}
  .brand{gap:9px}
  .brand img{height:22px}
  .brand b{font-size:24px}
  .top .btn{padding:9px 12px;font-size:12px}
  .top .btn .btxt{display:none}
}
@media(max-width:420px){
  .brand img{height:19px}
  .brand b{font-size:21px}
}
/* 顶栏按钮的长短文案：宽屏用全称，窄屏换成短标，免得把顶栏挤爆 */
.only-m{display:none}
@media(max-width:820px){.only-m{display:inline}}

/* ---------- 滚动渐入 ---------- */
.rv{opacity:0;transform:translateY(22px);transition:opacity .8s cubic-bezier(.22,.61,.36,1),transform .8s cubic-bezier(.22,.61,.36,1)}
.rv.on{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* ---------- 区块标题 ---------- */
.sec{padding:62px 0 8px}
.sec-t{display:flex;align-items:baseline;gap:12px;margin-bottom:26px;flex-wrap:wrap}
.sec-t h2{font-size:26px;font-weight:600;display:flex;align-items:center;gap:12px;letter-spacing:.5px}
.sec-t h2::before{content:"";width:4px;height:20px;background:linear-gradient(180deg,var(--gold),var(--orange));border-radius:2px}
.sec-t span{font-size:13px;color:var(--tx3)}
.sec-lead{font-size:14px;color:var(--tx2);line-height:1.95;max-width:860px;margin:-8px 0 24px}

/* ---------- 卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.cards.two{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
.card{position:relative;background:linear-gradient(180deg,rgba(17,28,51,.72),rgba(13,21,38,.9));
  border:1px solid var(--line);border-radius:18px;padding:26px 24px;overflow:hidden;
  transition:transform .3s cubic-bezier(.22,.61,.36,1),border-color .3s,box-shadow .3s}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--c,var(--blue)),transparent 70%);opacity:.9}
.card::after{content:"";position:absolute;top:0;left:-80%;width:55%;height:100%;transform:skewX(-18deg);
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.055),transparent);transition:left .6s ease}
.card:hover{transform:translateY(-5px);border-color:var(--line2);box-shadow:0 18px 44px rgba(0,0,0,.4)}
.card:hover::after{left:130%}
.card .ic{width:46px;height:46px;border-radius:13px;display:flex;align-items:center;justify-content:center;margin-bottom:16px;
  background:color-mix(in srgb,var(--c,var(--blue)) 15%,transparent);border:1px solid color-mix(in srgb,var(--c,var(--blue)) 32%,transparent)}
.card .ic svg{width:22px;height:22px;stroke:var(--c,var(--blue));fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:17.5px;font-weight:600;margin-bottom:10px;letter-spacing:.3px}
.card p{font-size:13.5px;color:var(--tx2);line-height:1.85}
.card ul{margin-top:14px;list-style:none}
.card ul li{font-size:12.5px;color:var(--tx2);padding:5px 0 5px 18px;position:relative}
.card ul li::before{content:"";position:absolute;left:0;top:12px;width:7px;height:7px;border-radius:50%;
  background:var(--c,var(--blue));opacity:.8;box-shadow:0 0 8px var(--c,var(--blue))}
.card .tagline{display:inline-block;font-size:11.5px;letter-spacing:.6px;padding:3px 10px;border-radius:12px;
  color:var(--c,var(--blue));border:1px solid color-mix(in srgb,var(--c,var(--blue)) 34%,transparent);
  background:color-mix(in srgb,var(--c,var(--blue)) 10%,transparent);margin-bottom:12px}

/* ---------- 首页通栏：武汉夜景实拍 + 三个业务入口 ---------- */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0}
.nband{position:relative;isolation:isolate;overflow:hidden;display:flex;flex-direction:column;
  min-height:clamp(500px,calc(100vh - var(--toph)),920px);
  padding:clamp(30px,6vh,70px) 0 clamp(56px,11vh,132px);
  background:#070B14 url("/assets/wuhan-night.webp") center 50%/cover no-repeat}
.nband::before{content:"";position:absolute;inset:0;z-index:-1;
  background:
    linear-gradient(180deg,rgba(7,11,20,.92) 0%,rgba(7,11,20,.28) 30%,rgba(7,11,20,.34) 58%,rgba(7,11,20,.92) 100%),
    radial-gradient(1100px 520px at 50% 108%,rgba(7,11,20,.6),transparent 72%)}
.nb-in{position:relative;z-index:1;width:100%;max-width:1180px;margin:0 auto;padding:0 22px;
  flex:1;display:flex;flex-direction:column;gap:26px}
.nb-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.nb-head h2{font-size:clamp(26px,4vw,40px);font-weight:600;letter-spacing:.04em;color:#fff;
  display:flex;align-items:center;gap:12px;text-shadow:0 2px 22px rgba(0,0,0,.66)}
.nb-head h2::before{content:"";width:4px;height:.76em;border-radius:2px;flex:none;
  background:linear-gradient(180deg,var(--gold),var(--orange))}
.nb-head span{font-size:clamp(13px,1.6vw,15.5px);color:rgba(232,238,249,.88);letter-spacing:.05em;
  text-shadow:0 1px 16px rgba(0,0,0,.75)}
.nb-cards{margin-top:auto;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.nb-card{position:relative;display:flex;flex-direction:column;text-decoration:none;color:inherit;
  padding:21px 21px 18px;border-radius:16px;
  background:rgba(10,17,32,.42);border:1px solid rgba(255,255,255,.17);
  -webkit-backdrop-filter:blur(16px) saturate(1.25);backdrop-filter:blur(16px) saturate(1.25);
  box-shadow:0 14px 36px rgba(0,0,0,.34);
  transition:background .28s,border-color .28s,transform .28s,box-shadow .28s}
.nb-card::before{content:"";position:absolute;inset:0 0 auto 0;height:2.5px;border-radius:16px 16px 0 0;
  background:linear-gradient(90deg,var(--c,var(--gold)),transparent 74%)}
.nb-card:hover{background:rgba(13,23,44,.66);border-color:rgba(34,211,238,.46);transform:translateY(-4px);
  box-shadow:0 22px 48px rgba(0,0,0,.46)}
.nb-card h3{font-size:18px;font-weight:600;color:#fff;letter-spacing:.3px;margin-bottom:9px;
  display:flex;align-items:center;gap:9px}
.nb-card h3 svg{width:19px;height:19px;flex:none;stroke:var(--c,var(--gold));fill:none;
  stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.nb-card p{font-size:12.7px;color:rgba(232,238,249,.8);line-height:1.8}
.nb-card .go{margin-top:auto;padding-top:14px;font-size:12.5px;color:var(--cyan);
  display:flex;align-items:center;gap:6px}
.nb-card .go svg{width:15px;height:15px;flex:none;stroke:currentColor;fill:none;
  stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;transition:transform .28s}
.nb-card:hover .go svg{transform:translateX(4px)}
.nband .nb-head,.nband .nb-cards{animation:nbin .8s cubic-bezier(.22,.61,.36,1) both}
.nband .nb-cards{animation-delay:.13s}
@keyframes nbin{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
/* CTA 横幅里还在用这份按钮排布 */
.hero-cta{position:relative;z-index:1;margin-top:36px;display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero-cta .btn{padding:13px 30px;font-size:14.5px;border-radius:13px}
@media(max-width:820px){
  .nband{min-height:0;padding:34px 0 42px;background-position:center 52%}
  .nb-in{gap:20px}
  .nb-cards{grid-template-columns:1fr;gap:12px}
  .nb-card{padding:16px 17px 15px}
  .nb-card h3{font-size:16.5px}
  .nb-card .go{padding-top:11px}
}
@media(prefers-reduced-motion:reduce){
  .nband .nb-head,.nband .nb-cards{animation:none}
}

/* ---------- 步骤 / 流程 ---------- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(228px,1fr));gap:16px;counter-reset:st}
.step{position:relative;background:linear-gradient(180deg,rgba(17,28,51,.62),rgba(13,21,38,.86));
  border:1px solid var(--line);border-radius:16px;padding:24px 22px 22px}
.step::before{counter-increment:st;content:"0" counter(st);position:absolute;right:18px;top:12px;
  font-size:30px;font-weight:700;color:rgba(46,107,255,.20);font-variant-numeric:tabular-nums}
.step h4{font-size:15.5px;font-weight:600;margin-bottom:9px;color:var(--tx)}
.step p{font-size:13px;color:var(--tx2);line-height:1.85}

/* ---------- CTA 横幅 ---------- */
.band{margin-top:66px;border-radius:22px;position:relative;overflow:hidden;
  padding:42px 46px;text-align:left;
  display:flex;align-items:center;justify-content:space-between;gap:40px;
  background:linear-gradient(120deg,rgba(46,107,255,.16),rgba(34,211,238,.08) 55%,rgba(255,196,61,.08));
  border:1px solid rgba(46,107,255,.36)}
.band::after{content:"";position:absolute;inset:auto -80px -160px auto;width:320px;height:320px;border-radius:50%;
  background:radial-gradient(circle,rgba(34,211,238,.16),transparent 70%)}
.band-tx{position:relative;z-index:1;flex:1 1 auto;min-width:0}
.band h2{font-size:clamp(20px,3vw,28px);font-weight:600;letter-spacing:1.5px;margin-bottom:12px}
.band p{color:var(--tx2);font-size:13.5px}
.band .hero-cta{margin-top:0;position:relative;z-index:1;flex:0 0 auto;gap:14px;flex-wrap:nowrap}
.band .hero-cta .btn{width:158px;padding:13px 0}
@media(max-width:980px){
  .band{padding:30px 22px;flex-direction:column;align-items:stretch;gap:22px;text-align:center}
  .band .hero-cta{justify-content:center}
  .band .hero-cta .btn{width:calc(50% - 7px);min-width:0;flex:0 0 auto}
}

/* ---------- 页脚 ---------- */
.ft{margin-top:76px;border-top:1px solid rgba(46,107,255,.14);background:rgba(9,14,26,.6)}
.ft-in{max-width:1180px;margin:0 auto;padding:30px 22px 26px;display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:26px}
.ft h4{font-size:13.5px;font-weight:600;margin-bottom:12px;color:var(--tx)}
.ft p,.ft a{font-size:12.5px;color:var(--tx3);text-decoration:none;line-height:2}
.ft a{display:block}
.ft a:hover{color:var(--cyan)}
.ft .ft-logo{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.ft .ft-logo img{height:24px;width:auto;flex:none;display:block;object-fit:contain}
.ft .ft-logo b{font-size:27px;font-weight:600;letter-spacing:.05em;line-height:1;color:var(--tx)}
.ft-base{border-top:1px solid rgba(46,107,255,.1);text-align:center;padding:14px 22px;font-size:11.5px;
  color:var(--tx3);line-height:2}
.ft-base a{font-size:inherit;color:inherit;transition:color .18s;display:inline}
.ft-base a:hover{color:var(--cyan)}
@media(max-width:860px){.ft-in{grid-template-columns:1fr 1fr;gap:22px}}
@media(max-width:520px){.ft-in{grid-template-columns:1fr}}

/* ---------- 内页页头 ---------- */
.phead{position:relative;overflow:hidden;padding:52px 0 8px}
.phead h1{font-size:clamp(26px,4.5vw,40px);font-weight:700;letter-spacing:.04em;line-height:1.3;
  background:linear-gradient(100deg,var(--tx) 10%,var(--cyan) 60%,var(--blue) 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.phead p{margin-top:14px;font-size:14px;color:var(--tx2);line-height:1.95;max-width:820px}
.phead .crumb{font-size:12px;color:var(--tx3);margin-bottom:16px;letter-spacing:.5px}
.phead .crumb a{color:var(--tx3);text-decoration:none}
.phead .crumb a:hover{color:var(--cyan)}

/* ---------- 图 + 文 双栏 ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}
.split.wide-l{grid-template-columns:1.25fr 1fr}
.split.wide-r{grid-template-columns:1fr 1.25fr}
@media(max-width:900px){.split,.split.wide-l,.split.wide-r{grid-template-columns:1fr;gap:22px}}
.figure{border-radius:18px;overflow:hidden;border:1px solid var(--line2);background:var(--panel2);
  box-shadow:0 14px 38px rgba(0,0,0,.42)}
.figure img{display:block;width:100%;height:auto}
.figure figcaption{font-size:12px;color:var(--tx3);padding:11px 15px;border-top:1px solid var(--line);
  background:rgba(7,11,20,.5);line-height:1.7}
.figure.round{border-radius:22px}
.figure.pad{padding:14px;background:rgba(13,21,38,.9)}

/* ---------- 团队 ---------- */
.team-card{display:grid;grid-template-columns:250px 1fr;gap:28px;align-items:center;max-width:920px}
.team-photo{border-radius:14px;overflow:hidden;border:1px solid var(--line2);
  background:var(--panel3);box-shadow:0 10px 28px rgba(0,0,0,.34)}
.team-photo img{display:block;width:100%;height:auto}
.card .team-info h3{font-size:22px;font-weight:600;margin-bottom:12px;letter-spacing:.4px}
.team-role{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:16px}
.team-role span{font-size:12.5px;padding:4px 12px;border-radius:14px;
  border:1px solid rgba(46,107,255,.3);background:rgba(46,107,255,.1);color:var(--tx)}
.card .team-info p{margin-bottom:12px}
.card .team-info p:last-child{margin-bottom:0}
@media(max-width:760px){.team-card{grid-template-columns:1fr;gap:20px}.team-photo{max-width:225px}}

/* ---------- 名单条（团队构成 / 能力） ---------- */
.roster{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}
.roster .rc{background:linear-gradient(180deg,rgba(17,28,51,.6),rgba(13,21,38,.85));
  border:1px solid var(--line);border-radius:14px;padding:18px 18px 16px}
.roster .rc b{display:block;font-size:14px;font-weight:600;margin-bottom:7px}
.roster .rc span{font-size:12.5px;color:var(--tx2);line-height:1.8}

/* ---------- 下载列表 ---------- */
.dl-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px}
.dl-card{position:relative;background:linear-gradient(180deg,rgba(17,28,51,.74),rgba(13,21,38,.92));
  border:1px solid var(--line);border-radius:18px;padding:24px 22px;overflow:hidden;
  transition:transform .3s,border-color .3s,box-shadow .3s}
.dl-card:hover{transform:translateY(-5px);border-color:var(--line2);box-shadow:0 18px 44px rgba(0,0,0,.42)}
.dl-card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--c,var(--blue)),transparent 70%)}
.dl-top{display:flex;align-items:center;gap:14px;margin-bottom:16px}
.dl-icon{width:52px;height:52px;flex:none;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:color-mix(in srgb,var(--c,var(--blue)) 14%,transparent);
  border:1px solid color-mix(in srgb,var(--c,var(--blue)) 32%,transparent)}
.dl-icon svg{width:25px;height:25px;stroke:var(--c,var(--blue));fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.dl-top h3{font-size:17px;font-weight:600;line-height:1.4}
.dl-top .ver{font-size:11.5px;color:var(--tx3);letter-spacing:.4px;margin-top:3px}
.dl-card>p{font-size:13.2px;color:var(--tx2);line-height:1.85;min-height:62px}
.dl-meta{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 18px}
.dl-meta span{font-size:11.5px;color:var(--tx3);padding:4px 10px;border-radius:10px;
  border:1px solid var(--line);background:rgba(7,11,20,.5)}
.dl-act{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.dl-act .btn{flex:1 1 60%}
.dl-note{font-size:11.5px;color:var(--tx3);margin-top:12px;line-height:1.8}
.dl-empty{font-size:13px;color:var(--tx3);padding:18px 0}
.dl-changelog{margin-top:10px}
.dl-changelog li{font-size:12.5px;color:var(--tx2);padding:7px 0 7px 18px;position:relative;list-style:none;
  border-bottom:1px dashed rgba(46,107,255,.14)}
.dl-changelog li:last-child{border-bottom:none}
.dl-changelog li::before{content:"";position:absolute;left:0;top:14px;width:6px;height:6px;border-radius:50%;
  background:var(--cyan);opacity:.8}
.dl-changelog b{color:var(--tx);font-weight:600}

/* ---------- 案例 ---------- */
.case{background:linear-gradient(180deg,rgba(17,28,51,.72),rgba(13,21,38,.9));
  border:1px solid var(--line);border-radius:18px;padding:24px 22px;position:relative;overflow:hidden}
.case::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--c,var(--blue)),transparent 70%)}
.case .cs-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.case .cs-head h3{font-size:16.5px;font-weight:600;display:flex;align-items:center;gap:8px}
/* 标题里内联的图标：SVG 不写宽高会被撑成 300×150，必须显式锁死 */
.case .cs-head h3 svg{width:18px;height:18px;flex:none;stroke:var(--c,var(--blue));
  fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.case .cs-ind{font-size:11.5px;color:var(--c,var(--blue));border:1px solid color-mix(in srgb,var(--c,var(--blue)) 34%,transparent);
  background:color-mix(in srgb,var(--c,var(--blue)) 10%,transparent);padding:3px 10px;border-radius:12px}
.case dl{margin-top:14px;display:grid;gap:12px}
.case dt{font-size:12px;letter-spacing:.5px;color:var(--tx3);margin-bottom:3px}
.case dd{font-size:13.2px;color:var(--tx2);line-height:1.85}
.case dd.result{color:var(--tx)}
.case dd.result b{color:var(--gold);font-weight:600}

/* ---------- 联系方式 ---------- */
.qr-block{display:flex;align-items:center;gap:18px}
.qr-box{width:158px;flex:none;padding:9px;border-radius:14px;background:#fff;
  box-shadow:0 8px 22px rgba(0,0,0,.38)}
.qr-box img{display:block;width:100%;height:auto;border-radius:6px}
.qr-tip b{display:block;font-size:14px;margin-bottom:6px}
.qr-tip span{font-size:12.5px;color:var(--tx3);line-height:1.8}
@media(max-width:760px){.qr-block{flex-direction:column;align-items:flex-start;gap:14px}.qr-box{width:176px}}
.cta-list{list-style:none}
.cta-list li{display:flex;align-items:center;gap:14px;padding:13px 0;border-bottom:1px solid rgba(46,107,255,.12)}
.cta-list li:last-child{border-bottom:none}
.cta-list .ic2{width:40px;height:40px;border-radius:11px;flex:none;display:flex;align-items:center;justify-content:center;
  background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.3)}
.cta-list .ic2 svg{width:19px;height:19px;stroke:var(--cyan);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.cta-list b{display:block;font-size:14px}
.cta-list span{font-size:12.5px;color:var(--tx3);line-height:1.8}

/* ---------- 关键句 / 使命 ---------- */
.card .mission{margin:0 0 16px;padding:13px 16px;border-left:3px solid var(--gold);border-radius:0 12px 12px 0;
  background:linear-gradient(90deg,rgba(255,196,61,.10),rgba(255,196,61,0) 92%);
  font-size:14.5px;line-height:1.95;color:var(--tx);letter-spacing:.2px}
.kv{display:grid;grid-template-columns:112px 1fr;gap:8px 16px;font-size:13.5px;margin-top:6px}
.kv dt{color:var(--tx3)}
.kv dd{color:var(--tx)}

/* ---------- 时间轴 ---------- */
.tl{position:relative;padding-left:26px;margin-top:6px}
.tl::before{content:"";position:absolute;left:6px;top:6px;bottom:6px;width:2px;
  background:linear-gradient(180deg,var(--gold),var(--blue) 60%,transparent)}
.tl .ti{position:relative;padding:0 0 24px}
.tl .ti:last-child{padding-bottom:0}
.tl .ti::before{content:"";position:absolute;left:-26px;top:6px;width:10px;height:10px;border-radius:50%;
  background:var(--gold);box-shadow:0 0 0 3px rgba(255,196,61,.16)}
.tl .ti b{display:block;font-size:14.5px;font-weight:600;margin-bottom:5px}
.tl .ti em{font-style:normal;font-size:11.5px;color:var(--gold);letter-spacing:.6px;margin-right:9px}
.tl .ti p{font-size:13.2px;color:var(--tx2);line-height:1.85}

/* ---------- 说明/提示块 ---------- */
.note{background:rgba(255,196,61,.07);border:1px solid rgba(255,196,61,.28);border-radius:14px;
  padding:15px 18px;font-size:12.8px;color:var(--tx2);line-height:1.9}
.note b{color:var(--gold);font-weight:600}
.note.blue{background:rgba(46,107,255,.08);border-color:rgba(46,107,255,.3)}
.note.blue b{color:var(--cyan)}

/* ---------- 表格 ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:13px;
  background:linear-gradient(180deg,rgba(17,28,51,.6),rgba(13,21,38,.85));
  border:1px solid var(--line);border-radius:14px;overflow:hidden}
.tbl th,.tbl td{padding:12px 15px;text-align:left;border-bottom:1px solid rgba(46,107,255,.12)}
.tbl thead th{font-size:12.5px;color:var(--tx3);font-weight:500;letter-spacing:.4px;background:rgba(7,11,20,.45)}
.tbl tbody tr:last-child td{border-bottom:none}
.tbl td{color:var(--tx2)}
.tbl td:first-child{color:var(--tx)}
.tbl .gold{color:var(--gold);font-weight:600}
.tbl-wrap{overflow-x:auto}

/* ---------- 占位页 ---------- */
.stub{text-align:center;padding:70px 22px 40px}
.stub .sicon{width:88px;height:88px;margin:0 auto 24px;border-radius:22px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(150deg,rgba(34,211,238,.14),rgba(46,107,255,.10));border:1px solid rgba(34,211,238,.3)}
.stub .sicon svg{width:40px;height:40px;stroke:var(--cyan);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.stub h1{font-size:clamp(24px,4vw,34px);font-weight:700;letter-spacing:.05em;margin-bottom:16px}
.stub h1 em{font-style:normal;background:linear-gradient(100deg,var(--cyan),var(--gold));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stub p{font-size:14px;color:var(--tx2);line-height:2;max-width:660px;margin:0 auto 26px}
.badge{display:inline-block;font-size:12px;letter-spacing:1px;color:var(--gold);padding:5px 14px;border-radius:14px;
  border:1px solid rgba(255,196,61,.35);background:rgba(255,196,61,.1);margin-bottom:22px}