:root{
    --blue:#2E7BE8; --blue-2:#19C3FF; --blue-deep:#5AA0FF; --blue-ink:#0f1a45;
    --orange:#FF7A1A; --orange-2:#FF9A4D; --orange-deep:#E85D00;
    --ink:#E8EEF8; --gray:#9FB0CC; --line:rgba(255,255,255,.12);
    --bg:#0a1030; --bg-soft:#0f1a45; --bg-deep:#0a1030;
    --glass:rgba(255,255,255,.05);
    --radius:20px; --shadow:0 18px 50px rgba(0,0,0,.45);
    --maxw:1140px;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;cursor:pointer;font-size:16px;font-weight:700;padding:14px 28px;border-radius:999px;transition:.2s;font-family:inherit}
  .btn-primary{background:linear-gradient(135deg,var(--orange),var(--orange-2));color:#fff;box-shadow:0 8px 20px rgba(255,122,26,.35)}
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,122,26,.45)}
  .btn-ghost{background:transparent;border:1.5px solid rgba(255,255,255,.7);color:#fff}
  .btn-ghost:hover{background:rgba(255,255,255,.12)}
  .btn-blue{background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;box-shadow:0 8px 20px rgba(27,91,255,.30)}
  .btn-blue:hover{transform:translateY(-2px)}
  .eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:2px;color:var(--blue);background:var(--bg-soft);padding:6px 14px;border-radius:999px;margin-bottom:14px}
  .sec{padding:84px 0}
  .sec-title{font-size:32px;font-weight:800;text-align:center;margin-bottom:12px;line-height:1.3}
  .sec-sub{text-align:center;color:var(--gray);max-width:680px;selection;margin:0 auto 48px;font-size:16px}
  .grad-text{background:linear-gradient(135deg,var(--blue),var(--orange));-webkit-background-clip:text;background-clip:text;color:transparent}

  /* NAV */
  .nav{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
  .brand{display:flex;align-items:center;gap:10px;font-weight:800}
  .brand .logo-box{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--blue),var(--orange));display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px}
  .brand small{display:block;font-size:11px;color:var(--gray);font-weight:600}
  .nav-cta{font-size:14px;padding:9px 20px}
  .nav-links{display:flex;gap:18px;font-size:14px;color:var(--gray);font-weight:600}
  .nav-links a:hover{color:var(--blue)}
  .nav-links a.active{color:var(--blue-deep)}

  /* HERO */
  .hero{position:relative;min-height:100vh;display:flex;align-items:center;color:#fff;overflow:hidden;background:radial-gradient(1200px 700px at 80% -10%,rgba(46,123,255,.55),transparent),radial-gradient(900px 600px at 10% 110%,rgba(255,122,26,.35),transparent),linear-gradient(135deg,var(--blue-ink),#0b1740)}
  .hero .net{position:absolute;inset:0;opacity:.5;pointer-events:none}
  .hero-bg{position:absolute;inset:0;z-index:1}
  .hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.45;mix-blend-mode:luminosity}
  .hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding-top:90px;padding-bottom:60px}
  .hero h1{font-size:46px;line-height:1.22;font-weight:900;margin-bottom:18px}
  .hero h2{font-size:18px;font-weight:600;color:#cfe0ff;margin-bottom:26px}
  .tags{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:30px}
  .tag{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);padding:9px 16px;border-radius:999px;font-size:14px;font-weight:600}
  .hero-cta{display:flex;gap:16px;flex-wrap:wrap}
  .hero-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:20px;padding:0;backdrop-filter:blur(6px);overflow:hidden}
  .hero-card img{width:100%;height:auto;display:block;border-radius:20px}

  .facts{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px}
  .fact{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);border-radius:12px;padding:12px}
  .fact b{display:block;font-size:15px;color:#fff;margin-bottom:3px}
  .fact span{font-size:12.5px;color:#bcd2ff}
  .dissoc{margin-top:22px;background:rgba(255,122,26,.15);border:1px solid rgba(255,154,77,.5);color:#ffd9b0;font-size:13.5px;padding:11px 16px;border-radius:12px}
  .dissoc b{color:#fff}

  .pain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  .pain{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:.2s}
  .pain:hover{transform:translateY(-4px)}
  .pain .ico{width:58px;height:58px;border-radius:14px;background:linear-gradient(135deg,rgba(255,122,26,.12),#ffd9b0);display:flex;align-items:center;justify-content:center;font-size:28px;margin-bottom:16px}
  .pain h3{font-size:20px;margin-bottom:10px}
  .pain p{color:var(--gray);font-size:15px}
  .quote{margin-top:40px;text-align:center;font-size:19px;font-weight:700;color:var(--blue-deep);background:var(--bg-soft);padding:20px;border-radius:14px}

  .hl{background:var(--bg-soft)}
  .steps{position:relative;max-width:860px;margin:0 auto;padding-left:10px}
  .step{display:grid;grid-template-columns:54px 1fr;gap:22px;padding:18px 0;position:relative}
  .step:not(:last-child)::before{content:"";position:absolute;left:26px;top:60px;bottom:-18px;width:2px;background:linear-gradient(var(--blue),var(--orange))}
  .step .num{width:54px;height:54px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 6px 16px rgba(27,91,255,.35);z-index:2}
  .step h3{font-size:19px;margin-bottom:6px}
  .step p{color:var(--gray);font-size:15px}
  .step .hl-tag{color:var(--orange-deep);font-weight:700}
  .step .auth-note{display:block;margin-top:8px;font-size:12.5px;color:var(--blue);font-weight:600}

  .courses{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:48px}
  .course{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
  .course h3{font-size:20px;margin-bottom:8px}
  .course .meta{font-size:13px;color:var(--blue);font-weight:700;margin-bottom:12px}
  .course p{color:var(--gray);font-size:15px}
  .qa2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
  .qa2 .box{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
  .qa2 .box h4{font-size:18px;margin-bottom:12px;color:var(--blue-deep)}
  .qa2 .box p{color:#C7D4EC;font-size:15px}
  .qa2 .box .mini{display:block;margin-top:10px;color:var(--gray);font-size:13px}
  .badge{display:inline-block;background:linear-gradient(135deg,var(--blue),var(--orange));color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px;margin-bottom:14px}

  .tech{background:var(--bg-deep);color:#fff}
  .tech .sec-title{color:#fff}
  .tech-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
  .tech-list li{list-style:none;display:flex;gap:14px;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.12)}
  .tech-list .k{color:var(--orange-2);font-weight:800;min-width:74px}
  .tech-list .v{color:#dbe6ff}
  .demo{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);border-radius:18px;overflow:hidden}
  .demo .bar{display:flex;gap:6px;padding:12px 16px;background:rgba(255,255,255,.08)}
  .demo .bar i{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.3);display:inline-block}
  .demo .screen{height:230px;overflow:hidden;display:flex;align-items:center;justify-content:center}
  .demo .screen img{width:100%;height:100%;object-fit:cover;border-radius:0 0 18px 18px}
  .tech-foot{margin-top:24px;text-align:center;font-size:13px;color:#8fa8d8}

  .infogrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:960px;margin:0 auto}
  .infogrid .cell{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:22px 18px;text-align:center}
  .infogrid .k{font-size:13px;color:var(--gray);margin-bottom:8px}
  .infogrid .v{font-size:18px;font-weight:800;color:var(--blue-deep)}
  .sched-note{text-align:center;font-size:13px;color:var(--gray);margin-top:18px}

  .ins-grid{display:grid;grid-template-columns:300px 1fr;gap:40px;align-items:center;max-width:900px;margin:0 auto}
  .ins-ph{width:280px;aspect-ratio:3/4;border-radius:20px;overflow:hidden;background:rgba(255,255,255,.05);border:1px solid var(--line)}
  .ins-ph img{width:100%;height:100%;display:block;object-fit:cover}
  .ins h3{font-size:26px;margin-bottom:6px}
  .ins .role{color:var(--blue);font-weight:700;margin-bottom:16px}
  .ins ul{list-style:none;display:grid;gap:10px}
  .ins ul li{padding-left:26px;position:relative;color:#C7D4EC}
  .ins ul li::before{content:"★";position:absolute;left:0;color:var(--orange)}
  .ins .idea{margin-top:18px;font-style:italic;color:var(--blue-deep);font-weight:700;border-left:4px solid var(--orange);padding-left:14px}

  .proof{background:var(--bg-soft)}
  .cards3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-bottom:46px}
  .tcard{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
  .tcard .quote-txt{font-size:15px;color:#C7D4EC;margin-bottom:14px}
  .tcard .who{font-weight:700;color:var(--blue-deep)}
  .tcard .who small{display:block;color:var(--gray);font-weight:500;font-size:13px}
  .stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;text-align:center}
  .stat .n{font-size:40px;font-weight:900;background:linear-gradient(135deg,var(--blue),var(--orange));-webkit-background-clip:text;background-clip:text;color:transparent}
  .stat .l{color:var(--gray);font-size:14px;margin-top:4px}
  .verify-note{text-align:center;font-size:12.5px;color:var(--gray);margin-top:18px;max-width:760px;margin-left:auto;margin-right:auto}

  /* FAQ */
  .faq{max-width:820px;margin:0 auto}
  .faq details{border:1px solid var(--line);border-radius:12px;margin-bottom:14px;background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);overflow:hidden}
  .faq summary{cursor:pointer;padding:18px 22px;font-weight:700;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center}
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"+";color:var(--blue);font-size:22px;font-weight:800}
  .faq details[open] summary::after{content:"−"}
  .faq .ans{padding:0 22px 18px;color:var(--gray);font-size:15px}

  /* SIGNUP (QR from v1 + form button) */
  .signup{background:var(--bg-soft)}
  .signup-box{display:grid;grid-template-columns:340px 1fr;gap:36px;align-items:center;max-width:760px;margin:0 auto;background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
  .qr-img{width:200px;height:200px;border-radius:16px;object-fit:cover;display:block;margin:0 auto}
  .qr-group{display:flex;gap:14px;align-items:flex-start;justify-content:center;flex-wrap:wrap}
  .qr-group>div{text-align:center}
  .qr-group img{width:150px;height:150px;border-radius:12px;display:block;margin:0 auto 6px;object-fit:cover}
  .signup-box h3{font-size:22px;margin-bottom:10px}
  .signup-box p{color:var(--gray);font-size:15px;margin-bottom:16px}
  .signup-actions{display:flex;gap:12px;flex-wrap:wrap}

  /* FOOTER CTA */
  .fcta{background:linear-gradient(135deg,var(--orange-deep),var(--orange));color:#fff;text-align:center}
  .fcta h2{font-size:34px;font-weight:900;margin-bottom:24px}
  .footer{background:var(--blue-ink);color:#cfe0ff;padding:40px 0;font-size:14px}
  .footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;align-items:center}
  .footer .logos{display:flex;gap:10px;align-items:center}
  .footer .logo-ph{width:96px;height:34px;border-radius:8px;overflow:hidden;background:rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center}
  .footer .logo-ph img{max-width:100%;max-height:100%;object-fit:contain}
  .footer .small{margin-top:14px;line-height:1.7;color:#9fc0ff;font-size:12.5px}

  /* ABOUT · 尧章科技 */
  .about{background:var(--bg-soft)}
  .manifesto{max-width:880px;margin:0 auto;font-size:16.5px;line-height:1.95;color:#C7D4EC}
  .manifesto p{margin-bottom:18px}
  .manifesto b{color:var(--blue-deep);font-weight:700}
  .loop{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:10px;margin:30px auto 0;max-width:880px}
  .loop span{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:999px;padding:9px 18px;font-size:14.5px;font-weight:700;color:var(--blue-deep);box-shadow:0 4px 12px rgba(20,50,120,.06)}
  .loop i{color:var(--orange);font-weight:800;font-style:normal;font-size:15px}
  .about-quote{background:linear-gradient(135deg,var(--blue-ink),#0b1740);color:#fff;border-radius:20px;padding:38px 40px;margin:46px auto 0;max-width:900px;font-size:19px;font-weight:700;line-height:1.7;text-align:center}
  .about-tenets{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:760px;margin:26px auto 0}
  .tenet{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:14px;padding:22px;text-align:center;font-size:17px;font-weight:600;color:#C7D4EC;box-shadow:var(--shadow)}
  .tenet-mark{background:linear-gradient(135deg,var(--blue),var(--orange));-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:900;font-size:20px}
  .about-foot{text-align:center;color:var(--gray);font-size:15px;max-width:760px;margin:36px auto 0;line-height:1.8}

  /* MODAL */
  .mask{position:fixed;inset:0;background:rgba(6,18,50,.6);display:none;align-items:center;justify-content:center;z-index:100;padding:20px}
  .mask.show{display:flex}
  .modal{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-radius:18px;max-width:440px;width:100%;padding:30px;position:relative;max-height:92vh;overflow:auto}
  .modal h3{font-size:22px;margin-bottom:6px}
  .modal p.sub{color:var(--gray);font-size:14px;margin-bottom:20px}
  .field{margin-bottom:14px}
  .field label{display:block;font-size:13px;font-weight:700;margin-bottom:6px;color:#C7D4EC}
  .field input,.field select{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:15px;font-family:inherit;background:rgba(255,255,255,.06)}
  .field input:focus,.field select:focus{outline:none;border-color:var(--blue)}
  .close{position:absolute;top:14px;right:18px;font-size:24px;color:#8fa8d8;cursor:pointer;background:none;border:none}
  .ok{text-align:center;padding:20px 0}
  .ok .big{font-size:44px;margin-bottom:10px}
  .ok h3{margin-bottom:8px}

  /* KEPu · 科普专栏 */
  .kepu-hero{background:radial-gradient(1100px 600px at 85% -10%,rgba(46,123,255,.55),transparent),radial-gradient(800px 500px at 10% 110%,rgba(255,122,26,.32),transparent),linear-gradient(135deg,var(--blue-ink),#0b1740);color:#fff;padding:130px 0 70px}
  .kepu-hero h1{font-size:44px;line-height:1.22;font-weight:900;margin-bottom:16px;max-width:880px}
  .kepu-hero .sub{font-size:18px;color:#cfe0ff;max-width:720px;margin-bottom:0}
  .kepu-hero .tags{margin-top:26px}

  /* 三档内容入口 */
  .tier-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  .tier{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
  .tier:hover{transform:translateY(-4px)}
  .tier .tier-no{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--blue),var(--orange));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:18px;margin-bottom:14px}
  .tier h3{font-size:21px;margin-bottom:8px}
  .tier p{color:var(--gray);font-size:15px;margin-bottom:16px;flex:1}
  .tier .tier-link{color:var(--blue-deep);font-weight:700;font-size:15px}

  /* 文章列表 */
  .post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
  .post{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
  .post:hover{transform:translateY(-4px)}
  .post .post-top{height:8px;background:linear-gradient(135deg,var(--blue),var(--orange))}
  .post .post-body{padding:26px 24px 28px;display:flex;flex-direction:column;flex:1}
  .post .tier-badge{display:inline-block;background:var(--bg-soft);color:var(--blue);font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px;margin-bottom:12px;align-self:flex-start}
  .post h3{font-size:19px;line-height:1.4;margin-bottom:10px}
  .post p{color:var(--gray);font-size:14.5px;margin-bottom:18px;flex:1}
  .post .read{color:var(--blue-deep);font-weight:700;font-size:14.5px}

  /* 合规闸门说明 */
  .compliance-note{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:0 14px 14px 0;padding:18px 22px;max-width:820px;margin:0 auto;font-size:14.5px;color:#C7D4EC;box-shadow:var(--shadow)}
  .compliance-note b{color:var(--blue-deep)}

  /* ARTICLE · 科普文章页 */
  .article-hero{background:radial-gradient(1100px 600px at 85% -10%,rgba(46,123,255,.5),transparent),linear-gradient(135deg,var(--blue-ink),#0b1740);color:#fff;padding:120px 0 60px}
  .article-hero .eyebrow{background:rgba(255,255,255,.12);color:#cfe0ff}
  .article-hero h1{font-size:36px;font-weight:900;line-height:1.3;margin-bottom:14px;max-width:840px}
  .article-hero .meta{color:#bcd2ff;font-size:15px}
  .article-body{max-width:820px;margin:0 auto;padding:54px 20px 20px}
  .article-body h2{font-size:24px;margin:34px 0 14px;color:var(--blue-deep);line-height:1.4}
  .article-body h3{font-size:19px;margin:24px 0 10px;color:var(--ink)}
  .article-body p{font-size:16.5px;color:#C7D4EC;margin-bottom:16px;line-height:1.9}
  .article-body ul{list-style:none;display:grid;gap:10px;margin:0 0 18px}
  .article-body li{padding-left:24px;position:relative;font-size:16px;color:#C7D4EC;line-height:1.8}
  .article-body li::before{content:"•";position:absolute;left:6px;color:var(--orange);font-weight:800}
  .article-body .key{background:var(--bg-soft);border-left:4px solid var(--orange);padding:14px 18px;border-radius:0 12px 12px 0;margin:18px 0;font-weight:600;color:var(--blue-deep)}
  .article-body .key b{color:var(--orange-deep)}
  .article-cta{background:var(--bg-soft);padding:50px 0}
  .article-back{display:inline-block;margin-top:10px;color:var(--blue);font-weight:700}
  .tier-badge{display:inline-block;background:linear-gradient(135deg,var(--blue),var(--orange));color:#fff;font-size:12px;font-weight:700;padding:5px 14px;border-radius:999px;margin-bottom:14px}

  /* responsive */
  @media(max-width:880px){
    .hero .wrap{grid-template-columns:1fr;padding-top:100px}
    .hero h1{font-size:32px}
    .hero-card{display:none}
    .facts{grid-template-columns:repeat(2,1fr)}
    .pain-grid,.courses,.qa2,.cards3,.stats,.infogrid{grid-template-columns:1fr}
    .tech-grid,.ins-grid,.signup-box{grid-template-columns:1fr;gap:26px}
    .ins-ph{max-width:220px;margin:0 auto}
    .qr-img{width:180px;height:180px}
    .qr-group{flex-direction:column;align-items:center;gap:22px}
    .qr-group img{width:170px!important;height:170px!important;margin-bottom:8px}
    .sec{padding:60px 0}
    .sec-title{font-size:25px}
    .fcta h2{font-size:26px}
    .nav-links{display:none}
    .nav .brand small{display:none}
    .about-tenets{grid-template-columns:1fr}
    .loop span{font-size:13px;padding:7px 13px}
    .loop i{display:none}
    .about-quote{font-size:16px;padding:28px 22px}
    .tier-grid,.post-grid{grid-template-columns:1fr}
    .kepu-hero h1{font-size:30px}
    .article-hero h1{font-size:26px}
  }
  /* PAID COURSES · 课程中心 */
  .pc-center{background:var(--bg-soft)}
  .pc-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:8px}
  .pc-card{background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 20px;box-shadow:var(--shadow);display:flex;flex-direction:column}
  .pc-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}
  .pc-badge{display:inline-flex;align-items:center;justify-content:center;min-width:46px;height:30px;padding:0 10px;background:linear-gradient(135deg,var(--orange),var(--orange-2));color:#fff;font-weight:800;font-size:15px;border-radius:8px}
  .pc-stage{font-size:12.5px;font-weight:700;color:var(--blue);background:rgba(255,255,255,.05);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);padding:5px 12px;border-radius:999px;border:1px solid var(--line)}
  .pc-name{font-size:19px;margin-bottom:8px;line-height:1.35}
  .pc-lead{color:var(--gray);font-size:14.5px;margin-bottom:12px}
  .pc-detail{border:1px solid var(--line);border-radius:12px;margin-bottom:14px;background:rgba(255,255,255,.06);overflow:hidden}
  .pc-detail summary{cursor:pointer;padding:12px 16px;font-weight:700;font-size:14.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;color:var(--blue-deep)}
  .pc-detail summary::-webkit-details-marker{display:none}
  .pc-detail summary::after{content:"+";color:var(--blue);font-size:20px;font-weight:800}
  .pc-detail[open] summary::after{content:"-"}
  .pc-body{padding:0 16px 14px;font-size:14px;color:#C7D4EC}
  .pc-label{font-weight:800;color:var(--blue-deep);margin:12px 0 6px;font-size:13.5px}
  .pc-body ul{list-style:none;display:grid;gap:6px}
  .pc-body li{padding-left:18px;position:relative;line-height:1.55}
  .pc-body li::before{content:"·";position:absolute;left:4px;color:var(--orange);font-weight:800}
  .pc-btn{width:100%;margin-top:auto}
  @media(max-width:880px){.pc-grid{grid-template-columns:1fr}}

  /* ===== 深蓝墨沉浸式科技风（升级自原站视觉体系，品牌蓝橙保留） ===== */
  body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(1100px 720px at 82% -10%,rgba(46,123,255,.22),transparent 60%),radial-gradient(900px 620px at 6% 110%,rgba(255,122,26,.12),transparent 60%),linear-gradient(180deg,#0a1030,#0b1238)}
  body::after{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;background-image:radial-gradient(rgba(130,170,255,.10) 1px,transparent 1px);background-size:30px 30px;-webkit-mask:radial-gradient(ellipse at 50% 26%,#000 22%,transparent 78%);mask:radial-gradient(ellipse at 50% 26%,#000 22%,transparent 78%)}
  .nav{background:rgba(10,16,48,.72)!important;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,.08)!important}
  .eyebrow{background:rgba(46,123,255,.12)!important}
  @keyframes glowPulse{0%,100%{box-shadow:0 8px 20px rgba(255,122,26,.35)}50%{box-shadow:0 8px 34px rgba(255,122,26,.62)}}
  @keyframes glowPulseB{0%,100%{box-shadow:0 8px 20px rgba(27,91,255,.30)}50%{box-shadow:0 8px 34px rgba(27,91,255,.55)}}
  .btn-primary{animation:glowPulse 3.4s ease-in-out infinite}
  .btn-blue{animation:glowPulseB 3.4s ease-in-out infinite}
  .pain:hover,.tier:hover,.post:hover,.course:hover,.tcard:hover,.pc-card:hover{transform:translateY(-6px);border-color:rgba(46,123,255,.45);box-shadow:0 22px 52px rgba(0,0,0,.5)}
  @keyframes pulseRed{0%{box-shadow:0 0 0 0 rgba(255,77,79,.6)}70%{box-shadow:0 0 0 10px rgba(255,77,79,0)}100%{box-shadow:0 0 0 0 rgba(255,77,79,0)}}
  .signup-box h3::before{content:"";display:inline-block;width:9px;height:9px;border-radius:50%;background:#ff4d4f;margin-right:9px;vertical-align:middle;animation:pulseRed 1.8s infinite}