:root{
  --bg:#f4f4f4;
  --bg-2:#ffffff;
  --bg-3:#f1f1f1;
  --ink:#111111;
  --ink-2:#222222;
  --muted:#7a7a7a;
  --muted-2:#9c9c9c;
  --accent:#c9892f;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}

.side-nav{position:fixed;left:0;top:0;bottom:0;width:240px;background:var(--bg-2);border-right:1px solid #e5e5e5;display:flex;flex-direction:column;justify-content:space-between;padding:24px 18px;z-index:10}
.side-nav__brand{display:flex;align-items:center;gap:10px;font-weight:700}
.side-nav__brand img{height:28px}
.side-nav__menu{display:grid;gap:10px;margin-top:20px}
.side-nav__menu a{color:var(--ink-2);padding:6px 8px;border-radius:8px;transition:.2s}
.side-nav__menu a.active{background:var(--bg-3);color:var(--ink)}
.side-nav__footer{display:grid;gap:10px}
.side-nav__cta{background:var(--ink);color:#fff;border:0;border-radius:8px;padding:8px 12px;cursor:pointer}
.side-nav__tag{font-size:12px;color:var(--muted)}

.side-toggle{display:none;position:fixed;left:14px;top:14px;z-index:20;border:1px solid #ddd;background:#fff;border-radius:8px;padding:6px 10px}

.canvas{margin-left:240px;min-height:100vh}
.canvas section{padding:120px 6%}
.section-head h2{font-size:26px}
.section-head p{color:var(--muted);margin-top:8px}

.cover{background:var(--bg-2);padding-top:80px;padding-bottom:120px}
.cover__media img{height:420px;object-fit:cover;border-radius:18px}
.cover__text{margin-top:28px;max-width:720px}
.cover__badge{font-size:12px;color:var(--muted);letter-spacing:1px}
.cover h1{font-size:38px;margin-top:8px}
.cover__sub{font-size:20px;color:var(--ink-2);margin-top:6px}
.cover p{color:var(--muted);margin-top:10px}
.cover__actions{display:flex;gap:10px;margin-top:18px}
.btn-main{background:#111;color:#fff;padding:12px 26px;border-radius:8px;border:0;transition:all .25s}
.btn-main:hover{background:#333}
.btn-light{border:1px solid #ddd;padding:12px 24px;border-radius:8px;background:transparent}

.about{background:var(--bg-3);display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center}
.about__media{position:relative}
.about__media img{border-radius:18px;height:360px;object-fit:cover}
.about__stamp{position:absolute;right:-12px;bottom:-12px;width:60px;height:60px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700}
.eyebrow{font-size:12px;color:var(--muted-2)}

.versions{background:var(--bg-2)}
.versions__rail{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;margin-top:18px}
.rail-track{display:grid;grid-auto-flow:column;grid-auto-columns:200px;gap:12px;overflow:hidden}
.rail-item{background:var(--bg-2);border-radius:16px;border:1px solid #eee;padding:16px;display:grid;gap:10px;place-items:center;cursor:pointer;transition:all .3s ease}
.rail-item:hover{transform:translateY(-6px);box-shadow:0 12px 30px rgba(0,0,0,0.08)}
.rail-item img{width:26px;height:26px;object-fit:contain}
.card{background:#ffffff;border-radius:16px;border:1px solid #eee;transition:all .3s ease}
.card:hover{transform:translateY(-6px);box-shadow:0 12px 30px rgba(0,0,0,0.08)}
.rail-btn{width:36px;height:36px;border-radius:50%;border:1px solid #ddd;background:#fff}
.versions__action{margin-top:14px}

.steps{background:var(--bg-3)}
.steps__grid{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;margin-top:18px}
.step{display:grid;gap:8px;text-align:center}
.step-icon{width:60px;height:60px;border-radius:50%;background:#eef0f2;border:1px solid #d7dbe0;display:flex;align-items:center;justify-content:center;margin:auto}
.step-icon img{width:28px;height:28px;object-fit:contain;filter:drop-shadow(0 1px 1px rgba(0,0,0,.25))}
.step p{color:var(--muted);font-size:13px}


.gallery{background:var(--bg-3)}
.gallery__rail{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;margin-top:18px}
.rail-track img{height:420px;object-fit:cover;border-radius:14px;cursor:zoom-in}
.img-card{transition:all .3s}
.img-card:hover{transform:translateY(-8px)}

.news{background:var(--bg-2)}
.news__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:18px}
.news-card{border-radius:14px;overflow:hidden;border:1px solid #eee;transition:all .3s}
.news-card:hover{transform:translateY(-6px);box-shadow:0 12px 25px rgba(0,0,0,.08)}
.news__card{background:#fff}
.news__card img{height:180px;object-fit:cover}
.news__date{padding:10px 16px 0;color:var(--muted);font-size:12px}
.news__card h3{padding:0 16px}
.news__card p{padding:0 16px 8px;color:var(--muted)}
.news__card button{margin:0 16px 16px}

.materials{background:var(--bg-3)}
.tabs{margin-top:18px}
.tabs__nav{display:flex;gap:10px}
.tab{border:1px solid #ddd;background:#fff;border-radius:999px;padding:6px 12px;cursor:pointer}
.tab.active{background:var(--ink);color:#fff;border-color:transparent}
.tabs__content{margin-top:14px}
.tab-pane{display:none}
.tab-pane.active{display:grid;gap:10px}
.doc{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:center;background:#fff;border:1px solid #eee;border-radius:10px;padding:10px 12px}
.doc span{color:var(--muted);font-size:12px}
.doc button{background:var(--accent);color:#fff;border:0;border-radius:8px;padding:6px 10px}
.faq-inline{margin-top:18px;background:#fff;border:1px solid #eee;border-radius:12px;padding:12px}
.faq-inline p{color:var(--muted);font-size:13px;margin-top:6px}

.contact{background:var(--bg-2);display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center}
.contact__form{display:grid;gap:10px}
.contact__form input,.contact__form textarea{border:1px solid #ddd;border-radius:8px;padding:10px;background:#fff}

.footer{background:#fff;border-top:1px solid #e6e6e6}
.footer__grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.footer h3{font-size:14px}
.footer a,.footer span,.footer p{display:block;color:var(--muted);font-size:12px;margin-top:6px}

.modal{position:fixed;inset:0;background:rgba(0,0,0,0.55);display:none;align-items:center;justify-content:center;z-index:9999;padding:20px}
.modal.open{display:flex}
.modal__card{background:#fff;border-radius:16px;padding:18px;max-width:520px;width:100%;display:grid;gap:10px;position:relative}
.modal__close{position:absolute;right:10px;top:8px;border:0;background:transparent;font-size:22px;cursor:pointer}
.modal__video video{width:100%;border-radius:12px}

.backtop{position:fixed;right:18px;bottom:18px;width:40px;height:40px;border-radius:50%;border:1px solid #ddd;background:#fff;display:none}

.icon-box{width:56px;height:56px;background:#eef0f2;border-radius:14px;border:1px solid #d7dbe0;display:flex;align-items:center;justify-content:center;margin:auto}
.icon-box img{width:26px;height:26px;object-fit:contain;filter:drop-shadow(0 1px 1px rgba(0,0,0,.25))}
.icon-box svg{width:26px;height:26px;fill:#111}

.fade-up{opacity:0;transform:translateY(40px);transition:all .6s}
.fade-up.show{opacity:1;transform:none}

@media (max-width:1200px){
  .cover__media img{height:360px}
  .about__media img{height:300px}
}

@media (max-width:980px){
  .side-nav{position:fixed;left:0;top:0;bottom:0;width:260px;transform:translateX(-100%);transition:.2s;background:var(--bg-2);padding:16px 12px;z-index:11}
  .side-nav.open{transform:translateX(0);box-shadow:4px 0 16px rgba(0,0,0,0.1)}
  .side-toggle{display:block;z-index:21}
  .canvas{margin-left:0}
  .canvas section{padding:80px 5%}
  .about,.contact{grid-template-columns:1fr}
  .about__media{margin-top:20px;order:2}
  .about__text{order:1}
  .about__stamp{right:-8px;bottom:-8px;width:50px;height:50px;font-size:12px}
  .news__grid{grid-template-columns:1fr 1fr}
  .steps__grid{grid-template-columns:repeat(2,1fr)}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer{padding:40px 20px}
  .cover h1{font-size:28px}
  .cover__media img{height:280px}
  .section-head h2{font-size:22px}
  .rail-item{min-width:0;width:100%;max-width:160px}
}

@media (max-width:768px){
  .canvas section{padding:48px 3.5%;margin-bottom:12px}
  .side-nav{width:100%;bottom:auto;max-height:65vh;overflow-y:auto;border-right:none;border-bottom:none;background:#f9f9f9}
  .side-nav__menu{gap:2px;margin-top:14px}
  .side-nav__menu a{font-size:14px;padding:10px 12px;border-radius:6px;color:#555}
  .side-nav__menu a.active{background:#e8e8e8;color:#111;font-weight:500}
  .side-nav__brand{gap:8px;padding-bottom:10px;border-bottom:1px solid #eee;margin-bottom:10px}
  .side-nav__brand img{height:22px}
  .side-nav__cta{padding:12px 16px;font-size:13px;font-weight:500}
  .side-nav__footer{position:sticky;bottom:0;background:#f9f9f9;padding-top:14px;padding-bottom:8px;border-top:1px solid #eee}
  .side-nav__tag{font-size:11px}
  .side-toggle{left:8px;top:8px;font-size:20px;padding:8px 12px}

  .cover{padding-top:48px;padding-bottom:60px;background:linear-gradient(135deg,#ffffff 0%,#fafafa 100%)}
  .cover__media{display:none}
  .cover__badge{font-size:11px;font-weight:500;color:#888;letter-spacing:0.5px;margin-bottom:8px}
  .cover h1{font-size:26px;line-height:1.4;font-weight:700;margin-top:6px;color:#111}
  .cover__sub{font-size:15px;margin-top:8px;color:#555;font-weight:500}
  .cover p{font-size:14px;line-height:1.7;color:#666;margin-top:14px}
  .cover__actions{flex-direction:column;gap:10px;margin-top:24px}
  .cover__actions a{width:100%;text-align:center;padding:14px;font-weight:500;border-radius:8px}
  .btn-main{width:100%;padding:14px;font-size:15px;font-weight:500}
  .btn-light{width:100%;padding:14px;font-size:15px;font-weight:500}

  .about{gap:24px;padding:48px 3.5%;background:#fafafa}
  .about__text{order:1}
  .about__media{margin-top:0;margin-bottom:0;order:2}
  .about__media img{height:260px;border-radius:12px;box-shadow:0 8px 20px rgba(0,0,0,0.08)}
  .about__stamp{display:none}
  .about__text h2{font-size:22px;line-height:1.4;color:#111}
  .about__text p{font-size:14px;line-height:1.8;color:#555;margin-top:12px}
  .about__text a{margin-top:16px;display:inline-block;padding:12px 24px}

  .mpdl-download-bar{padding:48px 3.5%;background:linear-gradient(135deg,#1a1a2e 0%,#16213e 100%)}
  .mpdl-security-badges{gap:10px;margin-bottom:28px;flex-wrap:wrap;justify-content:center}
  .mpdl-badge{padding:8px 12px;font-size:12px;gap:6px}
  .mpdl-title{font-size:22px;font-weight:700;margin-bottom:8px}
  .mpdl-subtitle{font-size:13px;margin-bottom:20px;font-weight:500}
  .mpdl-cards{gap:14px;flex-direction:column}
  .mpdl-card{padding:24px 16px;border-radius:12px;min-width:0;width:100%;max-width:100%;flex:none;box-shadow:0 4px 16px rgba(0,0,0,0.15)}
  .mpdl-card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(0,0,0,0.2)}
  .mpdl-icon{font-size:32px;margin-bottom:8px}
  .mpdl-card-title{font-size:16px;font-weight:600}
  .mpdl-card-version{font-size:12px;color:rgba(255,255,255,.6);margin-top:4px}
  .mpdl-card-security{display:flex;flex-direction:column;gap:8px;width:100%;text-align:left;padding-top:10px;border-top:1px solid rgba(255,255,255,.15)}
  .mpdl-check{font-size:12px;gap:8px}
  .mpdl-disclaimer{padding:14px 12px;font-size:12px;gap:12px;line-height:1.6}

  .versions,.steps{padding:48px 3.5%}
  .section-head{margin-bottom:16px}
  .section-head h2{font-size:22px;line-height:1.4;color:#111;font-weight:700}
  .section-head p{font-size:13px;color:#666;margin-top:8px}
  .versions__rail,.gallery__rail{margin-top:20px}
  .rail-btn{display:none}
  .rail-track{overflow-x:auto;scroll-snap-type:x mandatory;gap:12px;grid-auto-columns:calc(100vw - 80px);padding-bottom:10px;padding-left:0}
  .rail-item{scroll-snap-align:start;border-radius:12px;padding:16px 12px;text-align:center;background:#fff;border:1px solid #efefef;box-shadow:0 2px 8px rgba(0,0,0,0.06);flex-direction:column;gap:12px}
  .rail-item:hover{box-shadow:0 4px 12px rgba(0,0,0,0.1)}
  .rail-item span{font-size:13px;line-height:1.5;color:#333;font-weight:500}
  .icon-box{width:50px;height:50px;border-radius:10px}
  .icon-box img{width:26px;height:26px}
  .card{border-radius:12px;box-shadow:0 2px 8px rgba(0,0,0,0.06)}

  .step{gap:12px;padding:16px 0;text-align:center}
  .step h3{font-size:14px;font-weight:600;color:#111}
  .step p{font-size:12px;line-height:1.6;color:#666}
  .step-icon{width:52px;height:52px;box-shadow:0 2px 8px rgba(0,0,0,0.08)}
  .step-icon img{width:26px;height:26px}

  .gallery__rail{margin-top:20px}
  .rail-track img{height:280px;border-radius:10px;box-shadow:0 4px 12px rgba(0,0,0,0.1)}

  .news__grid{grid-template-columns:1fr;gap:14px;margin-top:20px}
  .news-card{border-radius:12px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,0.08);background:#fff;border:none}
  .news-card:active{transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,0.12)}
  .news__card img{height:180px;object-fit:cover}
  .news__date{padding:12px 14px 0;color:#888;font-size:12px;font-weight:500}
  .news__card h3{font-size:15px;padding:8px 14px;line-height:1.5;color:#111;font-weight:600}
  .news__card p{font-size:13px;padding:0 14px 8px;line-height:1.7;color:#666}
  .news__card button{margin:0 14px 14px;padding:10px 16px;font-size:12px;font-weight:500;border-radius:6px}

  .materials{padding:48px 3.5%}
  .tabs__nav{gap:10px;flex-wrap:wrap;margin-bottom:20px}
  .tab{padding:10px 16px;font-size:13px;border-radius:20px;font-weight:500;border:1px solid #ddd;color:#555}
  .tab.active{background:#111;color:#fff;border-color:#111}
  .tabs__content{margin-top:16px}
  .doc{gap:12px;padding:14px;flex-direction:column;align-items:stretch;background:#fff;border:1px solid #efefef;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,0.05)}
  .doc span{width:100%;color:#888;font-size:12px;margin-top:4px}
  .doc button{align-self:flex-start;font-size:12px;padding:8px 14px;font-weight:500;border-radius:6px;margin-top:6px}
  .faq-inline{padding:16px;margin-top:20px;background:#fff;border:1px solid #efefef;border-radius:10px;box-shadow:0 2px 8px rgba(0,0,0,0.05)}
  .faq-inline h3{font-size:15px;font-weight:600;color:#111;margin-bottom:12px}
  .faq-inline p{font-size:13px;line-height:1.8;color:#666;margin-top:10px}
  .faq-inline p strong{color:#333;font-weight:600}

  .contact{gap:28px;padding:48px 3.5%;flex-direction:column}
  .contact__info{order:1}
  .contact__form{order:2}
  .contact__info h2{font-size:22px;line-height:1.4;color:#111;font-weight:700;margin-bottom:14px}
  .contact__info p{font-size:13px;color:#666;margin-top:10px;word-break:break-all}
  .contact__form{gap:12px}
  .contact__form input,.contact__form textarea{font-size:14px;padding:14px;border:1px solid #ddd;background:#fff;color:#333}
  .contact__form input::placeholder,.contact__form textarea::placeholder{color:#999}
  .contact__form button{margin-top:8px}

  .footer{border-top:1px solid #eee;padding:40px 3.5%;background:#f9f9f9}
  .footer__grid{grid-template-columns:1fr;gap:28px}
  .footer h3{font-size:14px;font-weight:600;color:#111;margin-bottom:10px}
  .footer a,.footer span,.footer p{font-size:12px;color:#666;margin-top:6px;line-height:1.8}
  .footer a:hover{color:#111}

  .modal__card{padding:20px;border-radius:14px;margin:16px;box-shadow:0 10px 40px rgba(0,0,0,0.2)}
  .modal__close{right:12px;top:10px;font-size:26px}
  .modal__meta{font-size:12px;color:#666;margin:10px 0}
  .modal__note{font-size:12px;color:#ff6b6b;margin-top:12px}

  .backtop{width:40px;height:40px;font-size:18px;right:16px;bottom:16px}
}

@media (max-width:480px){
  .canvas section{padding:40px 3%}
  .side-nav{width:100%;bottom:auto;max-height:70vh}
  .side-nav__menu a{font-size:13px;padding:9px 10px}
  .side-nav__brand{gap:6px;font-size:15px}
  .side-nav__cta{padding:10px 14px;font-size:12px}

  .cover{padding-top:40px;padding-bottom:48px}
  .cover__badge{font-size:10px;margin-bottom:6px}
  .cover h1{font-size:24px;line-height:1.35}
  .cover__sub{font-size:14px;margin-top:6px}
  .cover p{font-size:13px;line-height:1.7;margin-top:12px}
  .cover__actions{gap:10px;margin-top:20px}
  .cover__actions a{padding:13px;font-size:14px}

  .about{gap:20px;padding:40px 3%}
  .about__text h2{font-size:20px}
  .about__text p{font-size:13px;line-height:1.7}
  .about__media img{height:220px}

  .mpdl-download-bar{padding:40px 3%}
  .mpdl-security-badges{gap:8px;margin-bottom:24px}
  .mpdl-badge{padding:6px 10px;font-size:11px;gap:5px}
  .mpdl-title{font-size:20px;margin-bottom:6px}
  .mpdl-subtitle{font-size:12px;margin-bottom:16px}
  .mpdl-cards{gap:12px}
  .mpdl-card{padding:20px 14px;border-radius:10px}
  .mpdl-card-title{font-size:15px}
  .mpdl-card-version{font-size:11px}
  .mpdl-icon{font-size:28px}
  .mpdl-disclaimer{padding:12px 10px;font-size:11px;gap:10px}

  .versions,.steps{padding:40px 3%}
  .section-head h2{font-size:20px;line-height:1.35;margin-bottom:8px}
  .section-head p{font-size:12px;margin-top:6px}
  .rail-track{grid-auto-columns:calc(100vw - 60px)}
  .rail-item{padding:14px 10px;gap:10px}
  .rail-item span{font-size:12px}
  .icon-box{width:44px;height:44px}
  .icon-box img{width:22px;height:22px}

  .step{gap:10px;padding:12px 0}
  .step h3{font-size:13px}
  .step p{font-size:11px}
  .step-icon{width:48px;height:48px}

  .gallery__rail{margin-top:16px}
  .rail-track img{height:240px}

  .news__grid{gap:12px;margin-top:16px}
  .news__card img{height:160px}
  .news__date{padding:10px 12px 0;font-size:11px}
  .news__card h3{font-size:14px;padding:8px 12px;line-height:1.4}
  .news__card p{font-size:12px;padding:0 12px 6px;line-height:1.6}
  .news__card button{margin:0 12px 12px;padding:9px 12px;font-size:11px}

  .materials{padding:40px 3%}
  .tabs__nav{gap:8px}
  .tab{padding:9px 12px;font-size:12px}
  .doc{padding:12px;gap:10px}
  .doc span{font-size:11px}
  .doc button{padding:7px 12px;font-size:11px}
  .faq-inline{padding:14px;margin-top:16px}
  .faq-inline h3{font-size:14px;margin-bottom:10px}
  .faq-inline p{font-size:12px;line-height:1.7;margin-top:8px}

  .contact{gap:20px;padding:40px 3%}
  .contact__info h2{font-size:20px}
  .contact__info p{font-size:12px}
  .contact__form input,.contact__form textarea{padding:12px;font-size:13px}

  .footer{padding:32px 3%}
  .footer h3{font-size:13px}
  .footer a,.footer span,.footer p{font-size:11px;margin-top:5px}

  .modal__card{padding:18px;margin:12px;border-radius:12px}
  .icon-box{width:44px;height:44px}
}