/* roulang page: index */
:root{
      --ink:#0b2b24;
      --ink-2:#123a31;
      --mint:#62f0c8;
      --mint-soft:#dffbf2;
      --fog:#f5f2ea;
      --warm:#fbfaf5;
      --muted:#66786f;
      --line:#cbd8cf;
      --amber:#f2b35d;
      --coral:#ef8d79;
      --radius-xl:32px;
      --radius-lg:24px;
      --radius-md:18px;
      --shadow-soft:0 18px 55px rgba(11,43,36,.10);
      --shadow-card:0 12px 30px rgba(11,43,36,.08);
      --shadow-deep:0 24px 70px rgba(11,43,36,.22);
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at 12% 6%, rgba(98,240,200,.16), transparent 32%),
        radial-gradient(circle at 88% 18%, rgba(242,179,93,.15), transparent 28%),
        linear-gradient(180deg,#fbfaf5 0%,#f5f2ea 48%,#fbfaf5 100%);
      line-height:1.75;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    a{color:inherit;text-decoration:none}
    img,svg{max-width:100%;display:block}
    button,input,textarea{font:inherit}
    button{cursor:pointer}
    ::selection{background:rgba(98,240,200,.45);color:var(--ink)}
    .site-container{width:min(1180px,calc(100% - 32px));margin-inline:auto}
    .section{padding:96px 0}
    .section-tight{padding:68px 0}
    .section-title{font-size:clamp(2rem,4vw,2.75rem);line-height:1.16;font-weight:800;letter-spacing:-.03em;color:var(--ink)}
    .section-kicker{
      display:inline-flex;align-items:center;gap:8px;
      padding:7px 12px;border:1px solid rgba(18,58,49,.12);
      background:rgba(223,251,242,.72);border-radius:999px;
      color:#1f5b4e;font-size:14px;font-weight:700;
    }
    .section-kicker:before{content:"";width:8px;height:8px;border-radius:999px;background:var(--mint);box-shadow:0 0 0 4px rgba(98,240,200,.18)}
    .lead{color:var(--muted);font-size:17px;line-height:1.85}
    .card{
      background:rgba(255,255,255,.70);
      border:1px solid rgba(203,216,207,.82);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow-card);
      transition:transform .24s ease,border-color .24s ease,box-shadow .24s ease,background .24s ease;
    }
    .card:hover{transform:translateY(-3px);border-color:rgba(98,240,200,.85);box-shadow:var(--shadow-soft);background:rgba(255,255,255,.88)}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:10px;
      min-height:48px;padding:0 20px;border-radius:999px;
      font-weight:800;border:1px solid transparent;
      transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
      white-space:nowrap;
    }
    .btn:focus-visible,.nav-link:focus-visible,.footer-link:focus-visible,input:focus-visible,textarea:focus-visible{
      outline:3px solid rgba(242,179,93,.55);outline-offset:3px;
    }
    .btn-primary{background:var(--mint);color:var(--ink);box-shadow:0 12px 26px rgba(98,240,200,.28)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 34px rgba(98,240,200,.38);background:#79f7d5}
    .btn-secondary{background:rgba(255,255,255,.64);border-color:rgba(18,58,49,.15);color:var(--ink)}
    .btn-secondary:hover{transform:translateY(-2px);background:var(--mint-soft);border-color:rgba(98,240,200,.65)}
    .btn-dark{background:var(--ink);color:var(--mint);box-shadow:0 16px 36px rgba(11,43,36,.2)}
    .btn-dark:hover{transform:translateY(-2px);background:#08231d}
    .badge{
      display:inline-flex;align-items:center;gap:7px;
      padding:7px 11px;border-radius:999px;
      background:rgba(255,255,255,.72);
      border:1px solid rgba(203,216,207,.78);
      color:#31564d;font-size:13px;font-weight:700;
    }
    .badge-dot{width:7px;height:7px;border-radius:999px;background:var(--mint)}
    .site-header{position:sticky;top:0;z-index:50;padding:16px 0 10px;backdrop-filter:blur(18px)}
    .nav-panel{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      background:rgba(251,250,245,.88);
      border:1px solid rgba(203,216,207,.86);
      border-radius:24px;padding:10px 12px;
      box-shadow:0 12px 40px rgba(11,43,36,.08);
    }
    .brand{display:flex;align-items:center;gap:10px;min-width:max-content;font-weight:900;letter-spacing:-.02em}
    .brand-mark{
      width:40px;height:40px;border-radius:15px;
      background:linear-gradient(145deg,var(--ink),#1b4c40);
      display:grid;place-items:center;box-shadow:inset 0 0 0 1px rgba(98,240,200,.28),0 10px 24px rgba(11,43,36,.18);
      position:relative;overflow:hidden;
    }
    .brand-mark:before{
      content:"";width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-left:13px solid var(--mint);margin-left:3px;
      filter:drop-shadow(0 0 8px rgba(98,240,200,.65));
    }
    .nav-menu{display:flex;align-items:center;gap:8px}
    .nav-link{
      display:inline-flex;align-items:center;gap:8px;
      min-height:42px;padding:0 13px;border-radius:16px;
      color:#31564d;font-weight:800;font-size:14px;border:1px solid transparent;
      transition:background .2s ease,border-color .2s ease,transform .2s ease,color .2s ease;
    }
    .nav-link .nav-icon{width:18px;height:18px;border-radius:8px;background:rgba(18,58,49,.08);position:relative;flex:none}
    .nav-link .nav-icon:after{content:"";position:absolute;inset:5px;border-radius:99px;background:rgba(98,240,200,.9)}
    .nav-link:hover{background:#fff;border-color:rgba(203,216,207,.86);transform:translateY(-1px);color:var(--ink)}
    .nav-link.active{background:var(--mint-soft);border-color:rgba(98,240,200,.78);color:var(--ink)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .mobile-toggle{
      display:none;width:46px;height:46px;border-radius:16px;border:1px solid rgba(203,216,207,.9);
      background:#fff;align-items:center;justify-content:center;color:var(--ink);
    }
    .mobile-toggle span,.mobile-toggle span:before,.mobile-toggle span:after{
      content:"";display:block;width:20px;height:2px;background:var(--ink);border-radius:2px;transition:.2s ease;
    }
    .mobile-toggle span:before{transform:translateY(-7px)}
    .mobile-toggle span:after{transform:translateY(5px)}
    .mobile-menu{display:none}
    .hero{padding:86px 0 44px;position:relative;overflow:hidden}
    .hero-grid{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(420px,.98fr);gap:48px;align-items:center}
    .hero h1{font-size:clamp(2.35rem,6vw,4.25rem);line-height:1.08;font-weight:900;letter-spacing:-.055em;color:var(--ink);max-width:720px}
    .hero-copy{max-width:640px;color:#526960;font-size:18px;line-height:1.9}
    .trust-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
    .console{
      border-radius:34px;background:linear-gradient(155deg,#071d18 0%,#0f332b 62%,#173f35 100%);
      padding:18px;box-shadow:var(--shadow-deep);border:1px solid rgba(98,240,200,.25);
      position:relative;overflow:hidden;
    }
    .console:before{
      content:"";position:absolute;inset:0;
      background:
        linear-gradient(rgba(98,240,200,.055) 1px,transparent 1px),
        linear-gradient(90deg,rgba(98,240,200,.045) 1px,transparent 1px);
      background-size:26px 26px;mask-image:linear-gradient(180deg,#000,transparent 80%);
    }
    .console-inner{position:relative;background:rgba(255,255,255,.05);border:1px solid rgba(223,251,242,.12);border-radius:26px;padding:18px}
    .screen{
      height:244px;border-radius:22px;background:
        radial-gradient(circle at 26% 25%,rgba(98,240,200,.42),transparent 27%),
        radial-gradient(circle at 74% 36%,rgba(242,179,93,.26),transparent 22%),
        linear-gradient(135deg,#122f29,#061813);
      border:1px solid rgba(98,240,200,.22);position:relative;overflow:hidden;
    }
    .play-button{
      position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
      width:74px;height:74px;border-radius:999px;background:rgba(223,251,242,.14);
      border:1px solid rgba(98,240,200,.55);display:grid;place-items:center;backdrop-filter:blur(6px);
    }
    .play-button:after{content:"";width:0;height:0;border-top:13px solid transparent;border-bottom:13px solid transparent;border-left:20px solid var(--mint);margin-left:5px}
    .quality-pills{position:absolute;right:16px;top:16px;display:flex;gap:8px}
    .quality-pills span{padding:6px 10px;border-radius:999px;background:rgba(11,43,36,.7);border:1px solid rgba(98,240,200,.35);color:#dffbf2;font-size:12px;font-weight:800}
    .quality-pills span.active{background:var(--mint);color:var(--ink)}
    .progress-wrap{margin-top:15px}
    .progress-line{height:8px;background:rgba(255,255,255,.10);border-radius:999px;overflow:hidden}
    .progress-line i{display:block;width:68%;height:100%;background:linear-gradient(90deg,var(--mint),#b7ffe8);border-radius:999px;animation:pulseLine 3.5s ease-in-out infinite}
    @keyframes pulseLine{0%,100%{width:58%}50%{width:76%}}
    .console-row{display:grid;grid-template-columns:1fr 142px;gap:14px;margin-top:14px}
    .playlist{display:grid;gap:10px}
    .playlist-item{display:grid;grid-template-columns:54px 1fr;gap:10px;align-items:center;background:rgba(255,255,255,.06);border:1px solid rgba(223,251,242,.10);border-radius:18px;padding:9px}
    .thumb{height:38px;border-radius:12px;background:linear-gradient(135deg,rgba(98,240,200,.36),rgba(255,255,255,.08))}
    .line{height:8px;border-radius:999px;background:rgba(223,251,242,.28);margin:6px 0}
    .line.small{width:60%}
    .device-stack{display:grid;gap:10px}
    .device{background:rgba(98,240,200,.10);border:1px solid rgba(98,240,200,.2);border-radius:17px;padding:12px;color:#dffbf2;font-size:13px;font-weight:800}
    .entry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:22px}
    .entry-card{padding:20px;min-height:148px;display:flex;flex-direction:column;justify-content:space-between}
    .entry-card strong{font-size:18px}
    .entry-card p{font-size:14px;color:var(--muted);line-height:1.7;margin-top:8px}
    .entry-arrow{width:34px;height:34px;border-radius:14px;background:var(--mint-soft);display:grid;place-items:center;color:var(--ink);font-weight:900}
    .timeline{position:relative;display:grid;gap:18px}
    .timeline:before{content:"";position:absolute;left:22px;top:16px;bottom:16px;width:2px;background:linear-gradient(var(--mint),rgba(203,216,207,.25))}
    .pain-item{position:relative;padding:22px 24px 22px 66px}
    .pain-index{position:absolute;left:0;top:22px;width:46px;height:46px;border-radius:17px;background:var(--ink);color:var(--mint);display:grid;place-items:center;font-weight:900;border:3px solid var(--fog)}
    .architecture{
      background:linear-gradient(155deg,#0b2b24,#071d18);
      border-radius:34px;padding:28px;border:1px solid rgba(98,240,200,.22);
      box-shadow:var(--shadow-deep);position:relative;overflow:hidden;
    }
    .architecture:after{content:"";position:absolute;right:-110px;top:-110px;width:260px;height:260px;border-radius:999px;background:rgba(98,240,200,.16);filter:blur(2px)}
    .node-grid{position:relative;display:grid;grid-template-columns:repeat(5,1fr);gap:14px;z-index:1}
    .node{padding:20px;border-radius:22px;background:rgba(255,255,255,.07);border:1px solid rgba(223,251,242,.12);color:#eafbf6}
    .node span{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:13px;background:var(--mint);color:var(--ink);font-weight:900;margin-bottom:14px}
    .node h3{font-size:18px;font-weight:850;margin-bottom:8px}
    .node p{font-size:14px;color:#b9d1c8;line-height:1.7}
    .metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .metric-card{padding:24px}
    .metric-number{font-size:clamp(2rem,4vw,3.1rem);line-height:1;font-weight:950;letter-spacing:-.06em;color:var(--ink)}
    .metric-number small{font-size:18px;color:var(--amber);letter-spacing:0}
    .metric-card p{color:var(--muted);font-size:15px;margin-top:10px}
    .topic-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
    .topic-card{padding:28px;min-height:260px;position:relative;overflow:hidden}
    .topic-card:after{content:"";position:absolute;right:-40px;bottom:-40px;width:150px;height:150px;border-radius:999px;background:rgba(98,240,200,.18)}
    .topic-list{display:grid;gap:14px}
    .topic-list article{padding:18px;display:flex;gap:14px;align-items:flex-start}
    .mini-icon{width:40px;height:40px;border-radius:15px;background:var(--mint-soft);display:grid;place-items:center;flex:none;color:var(--ink);font-weight:900}
    .quote-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .quote-card{padding:24px}
    .avatar{width:44px;height:44px;border-radius:17px;background:linear-gradient(135deg,var(--mint),#fff);border:1px solid rgba(18,58,49,.08)}
    .faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .faq-item{padding:22px}
    .faq-item h3{font-size:18px;font-weight:850;margin-bottom:8px}
    .faq-item p{color:var(--muted);font-size:15px;line-height:1.85}
    .cta-panel{
      border-radius:34px;background:
        radial-gradient(circle at 18% 20%,rgba(98,240,200,.24),transparent 24%),
        linear-gradient(135deg,#0b2b24,#071d18);
      color:#fff;padding:42px;border:1px solid rgba(98,240,200,.22);box-shadow:var(--shadow-deep);
      display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center;overflow:hidden;position:relative;
    }
    .cta-panel p{color:#bad4cc;max-width:620px}
    .contact-strip{
      display:grid;grid-template-columns:1fr 1fr;gap:18px;
    }
    .feedback-form{padding:26px}
    .form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .field{display:grid;gap:7px;margin-bottom:12px}
    .field label{font-size:14px;font-weight:800;color:#31564d}
    .field input,.field textarea{
      width:100%;border:1px solid rgba(203,216,207,.9);background:rgba(255,255,255,.78);
      border-radius:16px;padding:12px 14px;color:var(--ink);transition:border-color .2s ease,box-shadow .2s ease,background .2s ease;
    }
    .field input:focus,.field textarea:focus{border-color:rgba(98,240,200,.9);box-shadow:0 0 0 4px rgba(98,240,200,.16);outline:none;background:#fff}
    .site-footer{background:#071d18;color:#dce9e4;padding:48px 0 28px;margin-top:40px}
    .footer-grid{display:grid;grid-template-columns:1.35fr .8fr .8fr 1fr;gap:30px}
    .footer-brand{display:flex;align-items:center;gap:10px;font-weight:900;color:#fff}
    .footer-text{color:#aac0b8;font-size:14px;line-height:1.85;margin-top:14px;max-width:360px}
    .footer-title{font-weight:900;color:#fff;margin-bottom:14px}
    .footer-links{display:grid;gap:9px}
    .footer-link{color:#b8cbc4;font-size:14px;transition:color .2s ease,transform .2s ease}
    .footer-link:hover{color:var(--mint);transform:translateX(2px)}
    .copyright{border-top:1px solid rgba(223,251,242,.12);margin-top:32px;padding-top:20px;color:#91aaa1;font-size:13px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
    @media (max-width:1024px){
      .hero-grid{grid-template-columns:1fr;gap:34px}
      .console{max-width:680px}
      .entry-grid,.metric-grid{grid-template-columns:repeat(2,1fr)}
      .node-grid{grid-template-columns:repeat(2,1fr)}
      .topic-grid,.contact-strip{grid-template-columns:1fr}
      .quote-grid{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr 1fr}
      .nav-menu,.nav-actions{display:none}
      .mobile-toggle{display:flex}
      .mobile-menu.open{display:grid;gap:10px;margin-top:12px;padding:12px;background:rgba(251,250,245,.95);border:1px solid rgba(203,216,207,.86);border-radius:22px;box-shadow:var(--shadow-soft)}
      .mobile-menu .nav-link{justify-content:flex-start;background:#fff;border-color:rgba(203,216,207,.72)}
      .mobile-menu .btn{width:100%}
    }
    @media (max-width:768px){
      .site-container{width:min(100% - 24px,1180px)}
      .section{padding:64px 0}
      .section-tight{padding:46px 0}
      .hero{padding:54px 0 32px}
      .hero-actions{display:grid;grid-template-columns:1fr}
      .btn{width:100%;min-height:50px}
      .entry-grid,.metric-grid,.faq-grid{grid-template-columns:1fr}
      .node-grid{grid-template-columns:1fr}
      .console-row{grid-template-columns:1fr}
      .screen{height:206px}
      .cta-panel{grid-template-columns:1fr;padding:28px}
      .form-row{grid-template-columns:1fr}
      .footer-grid{grid-template-columns:1fr}
      .nav-panel{border-radius:20px}
      .brand span{font-size:14px}
    }
    @media (max-width:520px){
      .hero h1{font-size:2.35rem;letter-spacing:-.04em}
      .screen{height:176px}
      .quality-pills{left:12px;right:auto;top:12px}
      .quality-pills span{font-size:11px;padding:5px 8px}
      .entry-card,.pain-item,.metric-card,.quote-card,.faq-item{padding:18px}
      .pain-item{padding-left:58px}
      .pain-index{width:42px;height:42px}
      .timeline:before{left:20px}
    }
    @media (prefers-reduced-motion:reduce){
      *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}
    }

/* roulang page: category1 */
:root{
      --ink:#071f1a;
      --ink-2:#0d2d25;
      --mint:#65f0bf;
      --mint-2:#dffbf1;
      --amber:#f0b65a;
      --coral:#ff8f7a;
      --paper:#fbfaf4;
      --mist:#eef3eb;
      --card:#fffffb;
      --muted:#62746d;
      --line:rgba(35,76,65,.16);
      --line-strong:rgba(101,240,191,.44);
      --shadow:0 24px 70px rgba(7,31,26,.12);
      --shadow-soft:0 14px 36px rgba(7,31,26,.08);
      --radius:28px;
      --radius-sm:18px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at 18% 8%, rgba(101,240,191,.18), transparent 32%),
        radial-gradient(circle at 88% 22%, rgba(240,182,90,.13), transparent 30%),
        linear-gradient(180deg,#fbfaf4 0%,#f3f5ed 48%,#fbfaf4 100%);
      line-height:1.75;
      -webkit-font-smoothing:antialiased;
      text-rendering:optimizeLegibility;
    }
    a{color:inherit;text-decoration:none}
    img,svg{max-width:100%;display:block}
    button,input,textarea{font:inherit}
    button{border:0;cursor:pointer}
    ::selection{background:rgba(101,240,191,.35);color:var(--ink)}
    :focus-visible{outline:3px solid rgba(240,182,90,.85);outline-offset:4px;border-radius:14px}
    .site-container{width:min(calc(100% - 40px),var(--container));margin-inline:auto}
    .site-header{position:sticky;top:0;z-index:50;padding:16px 0;background:rgba(251,250,244,.76);backdrop-filter:blur(18px)}
    .nav-panel{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      padding:12px;border:1px solid var(--line);border-radius:24px;
      background:rgba(255,255,251,.82);box-shadow:0 16px 42px rgba(7,31,26,.08);
    }
    .brand,.footer-brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
    .brand{min-width:max-content;padding:8px 10px}
    .brand-mark{
      width:34px;height:34px;border-radius:13px;
      background:
        linear-gradient(135deg,rgba(101,240,191,.95),rgba(223,251,241,.72)),
        radial-gradient(circle at 70% 30%,#fff 0 12%,transparent 13%);
      position:relative;box-shadow:inset 0 0 0 1px rgba(7,31,26,.12),0 8px 22px rgba(101,240,191,.32);
      flex:0 0 auto;
    }
    .brand-mark:after{
      content:"";position:absolute;left:13px;top:10px;
      border-left:10px solid var(--ink);border-top:7px solid transparent;border-bottom:7px solid transparent;
      filter:drop-shadow(0 0 8px rgba(255,255,255,.35));
    }
    .nav-menu{display:flex;align-items:center;gap:8px;padding:4px;border-radius:18px;background:rgba(238,243,235,.7)}
    .nav-link{
      display:inline-flex;align-items:center;gap:8px;min-height:42px;padding:9px 13px;border-radius:16px;
      color:#285046;font-weight:700;font-size:14px;border:1px solid transparent;transition:.22s ease;
      white-space:nowrap;
    }
    .nav-link:hover{background:#fff;border-color:var(--line);transform:translateY(-1px);box-shadow:0 10px 22px rgba(7,31,26,.06)}
    .nav-link.active{background:var(--mint-2);border-color:var(--line-strong);color:var(--ink)}
    .nav-icon{width:10px;height:10px;border-radius:999px;background:currentColor;box-shadow:0 0 0 4px rgba(101,240,191,.18)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      min-height:46px;padding:12px 18px;border-radius:999px;font-weight:800;
      transition:transform .22s ease,box-shadow .22s ease,background .22s ease,border-color .22s ease;
      border:1px solid transparent;white-space:nowrap;
    }
    .btn:hover{transform:translateY(-2px)}
    .btn:active{transform:translateY(0)}
    .btn-primary{background:var(--mint);color:var(--ink);box-shadow:0 14px 30px rgba(101,240,191,.28)}
    .btn-primary:hover{background:#7cf5ca;box-shadow:0 18px 38px rgba(101,240,191,.36)}
    .btn-secondary{background:rgba(255,255,251,.75);border-color:var(--line);color:var(--ink)}
    .btn-secondary:hover{background:var(--mint-2);border-color:var(--line-strong)}
    .mobile-toggle{display:none;width:46px;height:46px;border-radius:16px;background:var(--ink);position:relative}
    .mobile-toggle span,.mobile-toggle span:before,.mobile-toggle span:after{
      position:absolute;left:13px;width:20px;height:2px;border-radius:99px;background:var(--mint);content:"";transition:.2s ease;
    }
    .mobile-toggle span{top:22px}
    .mobile-toggle span:before{top:-7px;left:0}
    .mobile-toggle span:after{top:7px;left:0}
    .mobile-toggle[aria-expanded="true"] span{background:transparent}
    .mobile-toggle[aria-expanded="true"] span:before{top:0;transform:rotate(45deg)}
    .mobile-toggle[aria-expanded="true"] span:after{top:0;transform:rotate(-45deg)}
    .mobile-menu{
      display:none;margin-top:12px;padding:12px;border:1px solid var(--line);border-radius:22px;background:rgba(255,255,251,.94);
      box-shadow:var(--shadow-soft);
    }
    .page-hero{padding:76px 0 54px}
    .hero-wrap{
      display:grid;grid-template-columns:minmax(0,1.03fr) minmax(380px,.97fr);gap:34px;align-items:center;
      padding:34px;border:1px solid var(--line);border-radius:36px;background:rgba(255,255,251,.62);box-shadow:var(--shadow);
      position:relative;overflow:hidden;
    }
    .hero-wrap:before{
      content:"";position:absolute;inset:0;
      background:linear-gradient(120deg,rgba(101,240,191,.15),transparent 38%,rgba(240,182,90,.12));
      pointer-events:none;
    }
    .hero-copy,.quality-panel{position:relative;z-index:1}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;
      color:#224b41;background:rgba(223,251,241,.8);border:1px solid var(--line-strong);
      font-size:13px;font-weight:800;
    }
    .eyebrow:before{content:"";width:8px;height:8px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 5px rgba(101,240,191,.18)}
    h1{
      margin:18px 0 18px;font-size:clamp(36px,5vw,62px);line-height:1.1;letter-spacing:-.045em;font-weight:850;
      max-width:10.5em;
    }
    .hero-lead{font-size:18px;color:var(--muted);max-width:42em;margin:0 0 24px}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}
    .tag-row{display:flex;flex-wrap:wrap;gap:10px}
    .tag{
      display:inline-flex;align-items:center;gap:7px;padding:8px 11px;border-radius:999px;background:rgba(255,255,251,.78);
      border:1px solid var(--line);font-size:13px;font-weight:800;color:#31584f;
    }
    .tag strong{color:var(--ink)}
    .quality-panel{
      background:linear-gradient(180deg,#09241f,#061612);border-radius:32px;padding:22px;border:1px solid rgba(101,240,191,.28);
      box-shadow:inset 0 0 0 1px rgba(255,255,255,.04),0 24px 60px rgba(7,31,26,.25);
      color:#ecfff8;
    }
    .panel-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
    .screen-dots{display:flex;gap:7px}
    .screen-dots span{width:9px;height:9px;border-radius:50%;background:rgba(255,255,255,.25)}
    .screen-dots span:nth-child(2){background:var(--amber)}
    .screen-dots span:nth-child(3){background:var(--mint)}
    .quality-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .quality-chip{
      border:1px solid rgba(223,251,241,.14);border-radius:22px;padding:16px;background:rgba(255,255,255,.06);
      transition:.22s ease;
    }
    .quality-chip:hover{transform:translateY(-3px);border-color:rgba(101,240,191,.56);background:rgba(101,240,191,.09)}
    .quality-chip.active{background:rgba(101,240,191,.14);border-color:rgba(101,240,191,.68)}
    .quality-chip b{font-size:24px;line-height:1;color:var(--mint)}
    .quality-chip span{display:block;margin-top:8px;color:#b8cec7;font-size:13px}
    .progress-wrap{margin-top:18px;padding:16px;border-radius:22px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08)}
    .progress-line{height:10px;border-radius:999px;background:rgba(255,255,255,.12);overflow:hidden}
    .progress-line span{display:block;width:68%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--mint),#f0d18b);animation:flow 3.5s ease-in-out infinite}
    @keyframes flow{0%,100%{width:62%}50%{width:78%}}
    .section{padding:74px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}
    .section-kicker{color:#37675c;font-weight:850;margin-bottom:8px}
    h2{font-size:clamp(28px,3.8vw,43px);line-height:1.16;letter-spacing:-.035em;font-weight:850;margin:0}
    .section-desc{color:var(--muted);max-width:42em;margin:10px 0 0;font-size:17px}
    .intro-grid{display:grid;grid-template-columns:.92fr 1.08fr;gap:22px;align-items:stretch}
    .dark-card{
      border-radius:32px;background:linear-gradient(145deg,#08211c,#0d3027);color:#f3fff9;padding:30px;border:1px solid rgba(101,240,191,.24);
      box-shadow:var(--shadow);position:relative;overflow:hidden;
    }
    .dark-card:after{content:"";position:absolute;right:-70px;top:-70px;width:180px;height:180px;border-radius:50%;background:rgba(101,240,191,.12)}
    .dark-card p{color:#c4d9d2;position:relative}
    .check-list{display:grid;gap:14px}
    .check-item{
      display:flex;gap:14px;align-items:flex-start;padding:18px;border-radius:24px;background:rgba(255,255,251,.78);
      border:1px solid var(--line);box-shadow:var(--shadow-soft);transition:.22s ease;
    }
    .check-item:hover{transform:translateY(-3px);border-color:var(--line-strong)}
    .check-icon{width:30px;height:30px;border-radius:12px;background:var(--mint-2);display:grid;place-items:center;flex:0 0 auto;color:var(--ink);font-weight:900}
    .compare-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .tier-card{
      padding:22px;border-radius:28px;background:rgba(255,255,251,.82);border:1px solid var(--line);
      box-shadow:var(--shadow-soft);transition:.24s ease;min-height:250px;
    }
    .tier-card:hover{transform:translateY(-4px);border-color:var(--line-strong);box-shadow:var(--shadow)}
    .tier-name{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:16px}
    .tier-name b{font-size:24px;letter-spacing:-.02em}
    .pill{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(240,182,90,.18);color:#6b4613;font-size:12px;font-weight:850}
    .tier-card p{color:var(--muted);margin:0 0 18px}
    .mini-list{display:grid;gap:9px;margin:0;padding:0;list-style:none;color:#345d53;font-size:14px}
    .mini-list li{display:flex;gap:8px}
    .mini-list li:before{content:"";width:7px;height:7px;border-radius:50%;background:var(--mint);margin-top:10px;flex:0 0 auto}
    .path-panel{
      display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;padding:18px;border-radius:32px;background:rgba(14,45,37,.08);
      border:1px solid var(--line);
    }
    .path-step{
      padding:22px;border-radius:24px;background:var(--card);border:1px solid var(--line);position:relative;overflow:hidden;transition:.22s ease;
    }
    .path-step:hover{transform:translateY(-3px);border-color:var(--line-strong)}
    .step-num{font-size:13px;font-weight:900;color:#2f6a5d;background:var(--mint-2);border-radius:999px;padding:5px 9px;display:inline-flex;margin-bottom:12px}
    .path-step h3,.scenario-card h3,.faq-card h3,.topic-card h3{margin:0 0 8px;font-size:21px;line-height:1.28;font-weight:850}
    .path-step p,.scenario-card p,.topic-card p,.faq-card p{margin:0;color:var(--muted)}
    .scenario-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px}
    .topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .topic-card{
      border-radius:28px;background:rgba(255,255,251,.82);border:1px solid var(--line);box-shadow:var(--shadow-soft);
      padding:22px;transition:.24s ease;display:flex;flex-direction:column;min-height:236px;
    }
    .topic-card:hover{transform:translateY(-4px);border-color:var(--line-strong);box-shadow:var(--shadow)}
    .topic-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px;color:#497065;font-size:13px;font-weight:800}
    .topic-label{padding:6px 10px;border-radius:999px;background:var(--mint-2);color:#1f5145}
    .topic-link{margin-top:auto;display:inline-flex;align-items:center;gap:8px;color:var(--ink);font-weight:850}
    .topic-link span{transition:.22s ease}
    .topic-card:hover .topic-link span{transform:translateX(4px)}
    .scenario-card{
      padding:26px;border-radius:30px;background:rgba(255,255,251,.8);border:1px solid var(--line);box-shadow:var(--shadow-soft);
    }
    .scenario-large{
      min-height:100%;background:
        linear-gradient(135deg,rgba(101,240,191,.16),rgba(255,255,251,.78) 48%,rgba(240,182,90,.12)),
        var(--card);
    }
    .hud-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .hud-item{padding:14px;border-radius:18px;background:rgba(7,31,26,.07);border:1px solid var(--line)}
    .hud-item b{display:block;font-size:24px;color:var(--ink);line-height:1.1}
    .hud-item span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
    .faq-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .faq-card{
      padding:24px;border-radius:28px;background:rgba(255,255,251,.8);border:1px solid var(--line);box-shadow:var(--shadow-soft);
      transition:.22s ease;
    }
    .faq-card:hover{border-color:var(--line-strong);transform:translateY(-2px)}
    .cta-band{
      display:flex;align-items:center;justify-content:space-between;gap:24px;
      padding:28px 30px;border-radius:32px;background:linear-gradient(135deg,#071f1a,#11392f);
      color:#f5fff9;border:1px solid rgba(101,240,191,.3);box-shadow:var(--shadow);overflow:hidden;position:relative;
    }
    .cta-band:before{
      content:"";position:absolute;inset:auto -80px -120px auto;width:260px;height:260px;border-radius:50%;
      background:rgba(101,240,191,.16);pointer-events:none;
    }
    .cta-band h2{font-size:clamp(25px,3vw,34px)}
    .cta-band p{color:#c8ddd6;margin:8px 0 0;max-width:48em}
    .site-footer{margin-top:72px;padding:58px 0 26px;background:#071f1a;color:#eafff7}
    .footer-grid{display:grid;grid-template-columns:1.4fr .75fr .75fr 1fr;gap:34px}
    .footer-brand{color:#f4fff9}
    .footer-text{color:#bfd4cd;margin:16px 0 0;max-width:36em}
    .footer-title{color:#ffffff;margin:0 0 14px;font-weight:850}
    .footer-links{display:grid;gap:10px}
    .footer-link{color:#bfd4cd;transition:.2s ease}
    .footer-link:hover{color:var(--mint);transform:translateX(2px)}
    .copyright{
      margin-top:34px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
      display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;color:#9fb9b1;font-size:14px;
    }
    @media (prefers-reduced-motion:reduce){
      *,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition:none!important}
    }
    @media (max-width:1024px){
      .nav-menu,.nav-actions{display:none}
      .mobile-toggle{display:block}
      .mobile-menu.is-open{display:grid;gap:10px}
      .mobile-menu .nav-link{width:100%;justify-content:flex-start}
      .hero-wrap{grid-template-columns:1fr;padding:26px}
      .quality-panel{max-width:680px}
      .intro-grid,.scenario-grid{grid-template-columns:1fr}
      .compare-grid,.path-panel{grid-template-columns:repeat(2,minmax(0,1fr))}
      .topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
      .footer-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width:768px){
      .site-container{width:min(calc(100% - 28px),var(--container))}
      .site-header{padding:10px 0}
      .brand span:last-child{font-size:15px}
      .page-hero{padding:46px 0 34px}
      .section{padding:54px 0}
      .section-head{display:block}
      .hero-wrap{border-radius:28px;padding:22px}
      .quality-grid,.compare-grid,.path-panel,.topic-grid,.faq-grid{grid-template-columns:1fr}
      .hud-row{grid-template-columns:1fr}
      .cta-band{display:block;padding:24px}
      .cta-band .btn{margin-top:18px;width:100%}
      .footer-grid{grid-template-columns:1fr}
      .copyright{display:grid}
    }
    @media (max-width:520px){
      h1{font-size:35px;max-width:100%}
      .hero-lead{font-size:16px}
      .hero-actions .btn{width:100%}
      .quality-panel{padding:16px;border-radius:24px}
      .tier-card,.topic-card,.faq-card,.scenario-card{border-radius:24px;padding:20px}
      .nav-panel{border-radius:20px}
    }

/* roulang page: category2 */
:root {
      --ink: #08211d;
      --ink-2: #10362f;
      --mint: #7cf4c8;
      --mint-2: #b9f7df;
      --amber: #f3b85b;
      --coral: #ff8f78;
      --paper: #f8f6ee;
      --paper-2: #eef4ec;
      --card: rgba(255, 253, 246, 0.88);
      --muted: #60756f;
      --line: rgba(17, 65, 55, 0.14);
      --line-strong: rgba(124, 244, 200, 0.55);
      --shadow: 0 24px 70px rgba(8, 33, 29, 0.12);
      --shadow-soft: 0 14px 36px rgba(8, 33, 29, 0.09);
      --radius-xl: 32px;
      --radius-lg: 24px;
      --radius-md: 18px;
      --ease: 220ms ease;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--ink);
      background:
        radial-gradient(circle at 10% 8%, rgba(124, 244, 200, 0.22), transparent 32%),
        radial-gradient(circle at 90% 16%, rgba(243, 184, 91, 0.16), transparent 28%),
        linear-gradient(180deg, #fbf9f0 0%, #eef4ec 45%, #f8f6ee 100%);
      line-height: 1.75;
      text-rendering: optimizeLegibility;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img, svg {
      display: block;
      max-width: 100%;
    }

    button, input, textarea {
      font: inherit;
    }

    button {
      cursor: pointer;
    }

    ::selection {
      background: rgba(124, 244, 200, 0.55);
      color: var(--ink);
    }

    .site-container {
      width: min(1180px, calc(100% - 32px));
      margin-inline: auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      padding: 16px 0 10px;
      backdrop-filter: blur(18px);
      background: linear-gradient(180deg, rgba(248, 246, 238, 0.92), rgba(248, 246, 238, 0.72));
    }

    .nav-panel {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 14px;
      padding: 10px;
      border: 1px solid var(--line);
      border-radius: 24px;
      background: rgba(255, 253, 246, 0.82);
      box-shadow: var(--shadow-soft);
    }

    .brand,
    .footer-brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      color: var(--ink);
      letter-spacing: -0.02em;
      white-space: nowrap;
    }

    .brand {
      padding: 10px 12px;
      border-radius: 18px;
    }

    .brand:hover {
      background: rgba(124, 244, 200, 0.13);
    }

    .brand-mark {
      width: 34px;
      height: 34px;
      border-radius: 12px;
      background:
        linear-gradient(135deg, rgba(124, 244, 200, 1), rgba(185, 247, 223, 0.55)),
        radial-gradient(circle at 70% 25%, #fff, transparent 26%);
      box-shadow: inset 0 0 0 1px rgba(8, 33, 29, 0.15), 0 10px 24px rgba(20, 185, 129, 0.18);
      position: relative;
      flex: 0 0 auto;
    }

    .brand-mark::after {
      content: "";
      position: absolute;
      left: 13px;
      top: 10px;
      width: 0;
      height: 0;
      border-left: 10px solid var(--ink);
      border-top: 7px solid transparent;
      border-bottom: 7px solid transparent;
      opacity: 0.86;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 4px;
      border: 1px solid rgba(17, 65, 55, 0.08);
      border-radius: 20px;
      background: rgba(238, 244, 236, 0.66);
    }

    .nav-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      min-height: 42px;
      padding: 9px 13px;
      border: 1px solid transparent;
      border-radius: 16px;
      color: #27463f;
      font-size: 15px;
      font-weight: 700;
      transition: transform var(--ease), background var(--ease), border-color var(--ease), color var(--ease), box-shadow var(--ease);
    }

    .nav-icon {
      width: 10px;
      height: 10px;
      border-radius: 99px;
      background: rgba(16, 54, 47, 0.25);
      box-shadow: 0 0 0 4px rgba(124, 244, 200, 0.07);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--ink);
      background: rgba(124, 244, 200, 0.18);
      border-color: rgba(124, 244, 200, 0.58);
      transform: translateY(-1px);
    }

    .nav-link.active .nav-icon {
      background: var(--mint);
      box-shadow: 0 0 0 5px rgba(124, 244, 200, 0.18);
    }

    .nav-actions {
      display: flex;
      align-items: center;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 46px;
      padding: 12px 18px;
      border-radius: 999px;
      border: 1px solid transparent;
      font-weight: 800;
      line-height: 1;
      transition: transform var(--ease), box-shadow var(--ease), background var(--ease), border-color var(--ease), color var(--ease);
      user-select: none;
    }

    .btn:focus-visible,
    .nav-link:focus-visible,
    .brand:focus-visible,
    .footer-link:focus-visible,
    .mobile-toggle:focus-visible {
      outline: 3px solid rgba(243, 184, 91, 0.55);
      outline-offset: 3px;
    }

    .btn-primary {
      background: var(--mint);
      color: var(--ink);
      box-shadow: 0 14px 28px rgba(34, 197, 139, 0.2);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      background: #8ffbd4;
      box-shadow: 0 18px 36px rgba(34, 197, 139, 0.28);
    }

    .btn-secondary {
      background: rgba(255, 253, 246, 0.72);
      color: var(--ink);
      border-color: var(--line);
    }

    .btn-secondary:hover {
      transform: translateY(-2px);
      background: rgba(185, 247, 223, 0.22);
      border-color: rgba(124, 244, 200, 0.5);
    }

    .mobile-toggle {
      display: none;
      width: 46px;
      height: 46px;
      border: 1px solid var(--line);
      border-radius: 16px;
      background: rgba(255, 253, 246, 0.9);
      position: relative;
    }

    .mobile-toggle span,
    .mobile-toggle span::before,
    .mobile-toggle span::after {
      position: absolute;
      left: 12px;
      right: 12px;
      height: 2px;
      border-radius: 2px;
      background: var(--ink);
      content: "";
      transition: transform var(--ease), opacity var(--ease);
    }

    .mobile-toggle span {
      top: 22px;
    }

    .mobile-toggle span::before {
      left: 0;
      right: 0;
      top: -7px;
    }

    .mobile-toggle span::after {
      left: 0;
      right: 0;
      top: 7px;
    }

    .mobile-toggle.is-open span {
      transform: rotate(45deg);
    }

    .mobile-toggle.is-open span::before {
      opacity: 0;
    }

    .mobile-toggle.is-open span::after {
      transform: translateY(-7px) rotate(-90deg);
    }

    .mobile-menu {
      display: none;
      margin-top: 10px;
      padding: 12px;
      border: 1px solid var(--line);
      border-radius: 22px;
      background: rgba(255, 253, 246, 0.94);
      box-shadow: var(--shadow-soft);
    }

    .section {
      padding: 88px 0;
    }

    .section-tight {
      padding: 64px 0;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      width: fit-content;
      padding: 7px 12px;
      border: 1px solid rgba(124, 244, 200, 0.48);
      border-radius: 999px;
      background: rgba(124, 244, 200, 0.14);
      color: #17483f;
      font-size: 14px;
      font-weight: 800;
    }

    .eyebrow::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--mint);
      box-shadow: 0 0 0 5px rgba(124, 244, 200, 0.18);
    }

    .hero {
      padding: 70px 0 72px;
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
      gap: 44px;
      align-items: center;
    }

    .hero h1 {
      margin: 18px 0 18px;
      max-width: 11em;
      font-size: clamp(2.25rem, 5.4vw, 4.35rem);
      line-height: 1.08;
      letter-spacing: -0.055em;
      font-weight: 850;
      color: var(--ink);
    }

    .hero-subtitle {
      max-width: 620px;
      color: var(--muted);
      font-size: 18px;
      line-height: 1.82;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 28px;
    }

    .hero-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 26px;
    }

    .tag {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 7px 11px;
      border-radius: 999px;
      border: 1px solid var(--line);
      background: rgba(255, 253, 246, 0.66);
      color: #45635d;
      font-size: 14px;
      font-weight: 700;
    }

    .tag::before {
      content: "";
      width: 7px;
      height: 7px;
      border-radius: 99px;
      background: var(--amber);
    }

    .device-stage {
      min-height: 520px;
      border-radius: var(--radius-xl);
      padding: 28px;
      background:
        linear-gradient(145deg, rgba(8, 33, 29, 0.98), rgba(16, 54, 47, 0.95)),
        radial-gradient(circle at 80% 10%, rgba(124, 244, 200, 0.18), transparent 38%);
      border: 1px solid rgba(124, 244, 200, 0.26);
      box-shadow: 0 28px 80px rgba(8, 33, 29, 0.22);
      position: relative;
      overflow: hidden;
    }

    .device-stage::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
      background-size: 34px 34px;
      mask-image: linear-gradient(180deg, rgba(0,0,0,0.95), transparent 92%);
      pointer-events: none;
    }

    .stage-top {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 22px;
      color: #d9fff0;
    }

    .status-dot {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      font-weight: 800;
      color: rgba(217, 255, 240, 0.84);
    }

    .status-dot::before {
      content: "";
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: var(--mint);
      box-shadow: 0 0 18px rgba(124, 244, 200, 0.9);
    }

    .screen-desktop,
    .screen-tablet,
    .screen-phone {
      position: absolute;
      border: 1px solid rgba(124, 244, 200, 0.28);
      background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0.035));
      box-shadow: 0 18px 45px rgba(0,0,0,0.26);
      overflow: hidden;
    }

    .screen-desktop {
      left: 34px;
      right: 72px;
      top: 94px;
      height: 260px;
      border-radius: 24px;
    }

    .screen-tablet {
      right: 28px;
      bottom: 56px;
      width: 250px;
      height: 178px;
      border-radius: 26px;
      transform: rotate(-2deg);
    }

    .screen-phone {
      left: 62px;
      bottom: 32px;
      width: 138px;
      height: 244px;
      border-radius: 28px;
      transform: rotate(4deg);
    }

    .screen-bar {
      height: 28px;
      background: rgba(255,255,255,0.08);
      border-bottom: 1px solid rgba(124, 244, 200, 0.16);
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 0 12px;
    }

    .screen-bar i {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: rgba(185, 247, 223, 0.55);
    }

    .screen-content {
      padding: 16px;
    }

    .video-frame {
      height: 112px;
      border-radius: 18px;
      background:
        linear-gradient(135deg, rgba(124,244,200,0.18), rgba(243,184,91,0.09)),
        radial-gradient(circle at 34% 34%, rgba(255,255,255,0.22), transparent 28%);
      position: relative;
    }

    .video-frame::after {
      content: "";
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-40%, -50%);
      width: 0;
      height: 0;
      border-left: 22px solid rgba(217, 255, 240, 0.9);
      border-top: 14px solid transparent;
      border-bottom: 14px solid transparent;
    }

    .hud-lines {
      display: grid;
      gap: 9px;
      margin-top: 14px;
    }

    .hud-lines span {
      display: block;
      height: 9px;
      border-radius: 999px;
      background: rgba(217, 255, 240, 0.16);
    }

    .hud-lines span:nth-child(1) {
      width: 78%;
    }

    .hud-lines span:nth-child(2) {
      width: 55%;
    }

    .progress {
      height: 7px;
      border-radius: 999px;
      margin-top: 16px;
      background: rgba(255,255,255,0.14);
      overflow: hidden;
    }

    .progress span {
      display: block;
      width: 68%;
      height: 100%;
      border-radius: inherit;
      background: linear-gradient(90deg, var(--mint), var(--amber));
      animation: pulseWidth 3.4s ease-in-out infinite;
    }

    .floating-note {
      position: absolute;
      right: 30px;
      top: 68px;
      z-index: 4;
      padding: 11px 14px;
      border-radius: 16px;
      background: rgba(248, 246, 238, 0.94);
      color: var(--ink);
      font-weight: 800;
      box-shadow: 0 18px 40px rgba(0,0,0,0.22);
    }

    @keyframes pulseWidth {
      0%, 100% { width: 58%; }
      50% { width: 76%; }
    }

    .section-heading {
      display: grid;
      gap: 14px;
      margin-bottom: 34px;
    }

    .section-heading.center {
      text-align: center;
      justify-items: center;
    }

    .section-heading h2 {
      margin: 0;
      max-width: 760px;
      font-size: clamp(1.8rem, 3.7vw, 2.75rem);
      line-height: 1.16;
      letter-spacing: -0.035em;
      font-weight: 850;
      color: var(--ink);
    }

    .section-heading p {
      margin: 0;
      max-width: 740px;
      color: var(--muted);
      font-size: 17px;
      line-height: 1.85;
    }

    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 16px;
    }

    .scenario-card,
    .compat-card,
    .topic-row,
    .faq-card,
    .step-card {
      border: 1px solid var(--line);
      background: var(--card);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-soft);
      transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease), background var(--ease);
    }

    .scenario-card:hover,
    .compat-card:hover,
    .topic-row:hover,
    .faq-card:hover,
    .step-card:hover {
      transform: translateY(-3px);
      border-color: rgba(124, 244, 200, 0.62);
      box-shadow: var(--shadow);
    }

    .scenario-card {
      padding: 22px;
      min-height: 230px;
      position: relative;
      overflow: hidden;
    }

    .scenario-card::after {
      content: "";
      position: absolute;
      right: -34px;
      top: -34px;
      width: 112px;
      height: 112px;
      border-radius: 50%;
      background: rgba(124, 244, 200, 0.16);
    }

    .scenario-icon {
      width: 46px;
      height: 46px;
      border-radius: 16px;
      display: grid;
      place-items: center;
      background: var(--ink);
      color: var(--mint);
      font-weight: 900;
      margin-bottom: 18px;
      box-shadow: 0 12px 24px rgba(8, 33, 29, 0.14);
    }

    .scenario-card h3,
    .step-card h3,
    .compat-card h3,
    .topic-row h3,
    .faq-card h3 {
      margin: 0;
      color: var(--ink);
      font-weight: 850;
      line-height: 1.32;
    }

    .scenario-card h3 {
      font-size: 21px;
      margin-bottom: 9px;
    }

    .scenario-card p,
    .step-card p,
    .compat-card p,
    .topic-row p,
    .faq-card p {
      margin: 0;
      color: var(--muted);
      line-height: 1.75;
    }

    .step-layout {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
      gap: 26px;
      align-items: start;
    }

    .dark-panel {
      border-radius: var(--radius-xl);
      padding: 30px;
      min-height: 100%;
      color: #eafff7;
      background:
        radial-gradient(circle at 85% 16%, rgba(124,244,200,0.18), transparent 34%),
        linear-gradient(145deg, var(--ink), #061815);
      border: 1px solid rgba(124, 244, 200, 0.24);
      box-shadow: 0 26px 70px rgba(8, 33, 29, 0.2);
    }

    .dark-panel h2 {
      margin: 16px 0 14px;
      font-size: clamp(1.7rem, 3.4vw, 2.55rem);
      line-height: 1.18;
      font-weight: 850;
    }

    .dark-panel p {
      color: rgba(234, 255, 247, 0.74);
      margin: 0;
    }

    .mini-metrics {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      margin-top: 26px;
    }

    .mini-metric {
      border: 1px solid rgba(124, 244, 200, 0.16);
      border-radius: 20px;
      padding: 16px;
      background: rgba(255,255,255,0.055);
    }

    .mini-metric strong {
      display: block;
      color: var(--mint);
      font-size: 24px;
      line-height: 1;
      margin-bottom: 8px;
    }

    .mini-metric span {
      color: rgba(234, 255, 247, 0.72);
      font-size: 14px;
    }

    .step-list {
      display: grid;
      gap: 14px;
      position: relative;
    }

    .step-card {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 16px;
      padding: 22px;
      align-items: start;
    }

    .step-number {
      width: 42px;
      height: 42px;
      border-radius: 15px;
      display: grid;
      place-items: center;
      background: rgba(124, 244, 200, 0.22);
      color: var(--ink);
      font-weight: 900;
      border: 1px solid rgba(124, 244, 200, 0.45);
    }

    .step-card h3 {
      font-size: 21px;
      margin-bottom: 6px;
    }

    .compat-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 16px;
    }

    .compat-card {
      padding: 20px;
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 14px;
      align-items: start;
    }

    .check-icon {
      width: 34px;
      height: 34px;
      border-radius: 13px;
      background: rgba(124, 244, 200, 0.2);
      border: 1px solid rgba(124, 244, 200, 0.4);
      position: relative;
    }

    .check-icon::after {
      content: "";
      position: absolute;
      left: 11px;
      top: 8px;
      width: 10px;
      height: 15px;
      border-right: 3px solid var(--ink);
      border-bottom: 3px solid var(--ink);
      transform: rotate(42deg);
    }

    .compat-card h3 {
      font-size: 18px;
      margin-bottom: 4px;
    }

    .topic-list {
      display: grid;
      gap: 16px;
    }

    .topic-row {
      display: grid;
      grid-template-columns: 190px minmax(0, 1fr) auto;
      gap: 20px;
      align-items: center;
      padding: 16px;
    }

    .topic-visual {
      min-height: 124px;
      border-radius: 22px;
      background:
        linear-gradient(135deg, rgba(8,33,29,0.94), rgba(16,54,47,0.88)),
        radial-gradient(circle at 28% 28%, rgba(124,244,200,0.24), transparent 36%);
      position: relative;
      overflow: hidden;
    }

    .topic-visual::before {
      content: "";
      position: absolute;
      left: 18px;
      right: 18px;
      bottom: 18px;
      height: 8px;
      border-radius: 999px;
      background: rgba(255,255,255,0.15);
    }

    .topic-visual::after {
      content: "";
      position: absolute;
      left: 18px;
      bottom: 18px;
      width: 54%;
      height: 8px;
      border-radius: 999px;
      background: var(--mint);
    }

    .topic-badge {
      display: inline-flex;
      width: fit-content;
      margin-bottom: 7px;
      padding: 5px 9px;
      border-radius: 999px;
      background: rgba(243, 184, 91, 0.16);
      color: #6b4b18;
      font-size: 13px;
      font-weight: 800;
    }

    .topic-row h3 {
      font-size: 22px;
      margin-bottom: 6px;
    }

    .topic-meta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 112px;
      padding: 9px 12px;
      border-radius: 999px;
      color: var(--ink);
      background: rgba(124, 244, 200, 0.16);
      border: 1px solid rgba(124, 244, 200, 0.4);
      font-size: 14px;
      font-weight: 800;
    }

    .compare-band {
      border-radius: var(--radius-xl);
      padding: 28px;
      background: linear-gradient(135deg, rgba(255,253,246,0.86), rgba(238,244,236,0.8));
      border: 1px solid var(--line);
      box-shadow: var(--shadow-soft);
    }

    .compare-grid {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 12px;
    }

    .compare-item {
      padding: 18px;
      border-radius: 22px;
      background: rgba(255,255,255,0.62);
      border: 1px solid rgba(17,65,55,0.11);
    }

    .compare-item strong {
      display: block;
      color: var(--ink);
      font-size: 18px;
      margin-bottom: 8px;
    }

    .compare-item span {
      color: var(--muted);
      font-size: 15px;
      line-height: 1.7;
    }

    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 16px;
    }

    .faq-card {
      padding: 24px;
    }

    .faq-card h3 {
      font-size: 20px;
      margin-bottom: 9px;
    }

    .cta-panel {
      position: relative;
      overflow: hidden;
      border-radius: var(--radius-xl);
      padding: 36px;
      color: #eafff7;
      background:
        radial-gradient(circle at 82% 10%, rgba(124,244,200,0.18), transparent 34%),
        linear-gradient(135deg, #071b18, #123b33);
      border: 1px solid rgba(124,244,200,0.28);
      box-shadow: 0 26px 72px rgba(8, 33, 29, 0.22);
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 24px;
      align-items: center;
    }

    .cta-panel::after {
      content: "";
      position: absolute;
      right: -80px;
      top: -80px;
      width: 240px;
      height: 240px;
      border-radius: 50%;
      background: rgba(124, 244, 200, 0.12);
    }

    .cta-panel h2 {
      margin: 0 0 10px;
      font-size: clamp(1.7rem, 3vw, 2.55rem);
      line-height: 1.18;
      font-weight: 850;
    }

    .cta-panel p {
      margin: 0;
      color: rgba(234,255,247,0.74);
      max-width: 700px;
    }

    .cta-panel .btn-secondary {
      background: rgba(255,255,255,0.08);
      color: #eafff7;
      border-color: rgba(234,255,247,0.2);
    }

    .site-footer {
      margin-top: 80px;
      padding: 62px 0 28px;
      color: rgba(234, 255, 247, 0.76);
      background:
        radial-gradient(circle at 14% 18%, rgba(124,244,200,0.12), transparent 32%),
        linear-gradient(180deg, #08211d, #061613);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.7fr 0.8fr 1fr;
      gap: 34px;
      align-items: start;
    }

    .footer-brand {
      color: #f5fff9;
      margin-bottom: 14px;
    }

    .footer-text {
      max-width: 420px;
      margin: 0;
      color: rgba(234,255,247,0.68);
      line-height: 1.8;
    }

    .footer-title {
      margin: 0 0 14px;
      color: #f5fff9;
      font-weight: 850;
    }

    .footer-links {
      display: grid;
      gap: 10px;
    }

    .footer-link {
      color: rgba(234,255,247,0.68);
      transition: color var(--ease), transform var(--ease);
    }

    .footer-link:hover {
      color: var(--mint);
      transform: translateX(2px);
    }

    .copyright {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      margin-top: 44px;
      padding-top: 22px;
      border-top: 1px solid rgba(234,255,247,0.12);
      color: rgba(234,255,247,0.56);
      font-size: 14px;
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation: none !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }

    @media (max-width: 1024px) {
      .nav-menu,
      .nav-actions {
        display: none;
      }

      .mobile-toggle {
        display: inline-flex;
      }

      .mobile-menu.is-open {
        display: grid;
        gap: 10px;
      }

      .mobile-menu .nav-link,
      .mobile-menu .btn {
        width: 100%;
        justify-content: flex-start;
      }

      .hero-grid,
      .step-layout {
        grid-template-columns: 1fr;
      }

      .device-stage {
        min-height: 470px;
      }

      .scenario-grid,
      .compat-grid,
      .compare-grid,
      .footer-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }

      .topic-row {
        grid-template-columns: 160px minmax(0, 1fr);
      }

      .topic-meta {
        grid-column: 2;
        justify-self: start;
      }
    }

    @media (max-width: 768px) {
      .site-container {
        width: min(100% - 24px, 1180px);
      }

      .site-header {
        padding-top: 10px;
      }

      .brand {
        font-size: 15px;
        padding-left: 8px;
      }

      .hero {
        padding: 42px 0 52px;
      }

      .hero h1 {
        max-width: 100%;
        letter-spacing: -0.04em;
      }

      .hero-subtitle {
        font-size: 16px;
      }

      .section {
        padding: 58px 0;
      }

      .section-tight {
        padding: 44px 0;
      }

      .scenario-grid,
      .compat-grid,
      .compare-grid,
      .faq-grid,
      .footer-grid,
      .mini-metrics {
        grid-template-columns: 1fr;
      }

      .device-stage {
        min-height: 390px;
        padding: 20px;
      }

      .screen-desktop {
        left: 18px;
        right: 18px;
        top: 86px;
        height: 210px;
      }

      .screen-tablet {
        display: none;
      }

      .screen-phone {
        left: auto;
        right: 28px;
        bottom: 24px;
        width: 112px;
        height: 190px;
      }

      .floating-note {
        right: 18px;
        top: 54px;
        font-size: 13px;
      }

      .topic-row {
        grid-template-columns: 1fr;
      }

      .topic-meta {
        grid-column: auto;
      }

      .cta-panel {
        grid-template-columns: 1fr;
        padding: 28px;
      }

      .copyright {
        flex-direction: column;
      }
    }

    @media (max-width: 520px) {
      .nav-panel {
        border-radius: 20px;
      }

      .brand-mark {
        width: 30px;
        height: 30px;
        border-radius: 11px;
      }

      .brand span:last-child {
        max-width: 11.5em;
        overflow: hidden;
        text-overflow: ellipsis;
      }

      .hero-actions,
      .cta-panel > div:last-child {
        display: grid;
        width: 100%;
      }

      .btn {
        width: 100%;
      }

      .scenario-card,
      .step-card,
      .faq-card,
      .compare-band,
      .dark-panel {
        padding: 20px;
      }
    }