*{box-sizing:border-box}
html,body{margin:0;background:var(--bg,#fff);color:var(--text,#1c2733);font-family:"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.65}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--accent,#2aabee);text-decoration:none}
a:hover{color:var(--accent-hover,#1a8fd0)}
a:focus{outline:2px solid var(--accent,#2aabee);outline-offset:2px}
:root{
  --page:1120px;
  --bg:#fff;
  --text:#1c2733;
  --muted:#5b6f7e;
  --line:#e6eef4;
  --surface:#fff;
  --band:#f5f9fc;
  --accent:#2aabee;
  --accent-hover:#1a8fd0;
  --shadow:0 12px 32px rgba(28,39,51,.06);
  --radius:16px;
  --sec-y:3.2rem;
}
.wrap{max-width:var(--page);margin:0 auto;padding:0 1.5rem;min-width:0}
.stage{min-width:0}
section[id],.article-page{scroll-margin-top:5.5rem}
.kicker{margin:0 0 .55rem;color:var(--accent);font-size:.8rem;font-weight:700;letter-spacing:.08em}
h1,h2,h3,.brand-name{overflow-wrap:break-word}
h1{margin:0 0 .85rem;font-size:clamp(2rem,4vw,3.15rem);line-height:1.18;font-weight:750;letter-spacing:-.03em;color:#0f1b24}
h2{margin:0 0 .7rem;font-size:clamp(1.35rem,2.2vw,1.85rem);line-height:1.28;font-weight:700;color:#0f1b24}
h3{margin:0 0 .4rem;font-size:1.08rem;font-weight:700}
.lead,.dek,.sec-desc{margin:0;color:var(--muted);font-size:1.08rem;max-width:38rem}
.sec-head{margin-bottom:1.6rem;max-width:40rem}
.sec-desc{margin-top:.45rem}
.empty-note{color:var(--muted)}

.btn-cta,.nav-cta{display:inline-flex;align-items:center;justify-content:center;background:var(--accent);color:#fff;border-radius:10px;padding:.58rem 1.05rem;font-weight:700}
.btn-cta:hover,.nav-cta:hover{color:#fff;background:var(--accent-hover)}
.btn-ghost{display:inline-flex;align-items:center;padding:.56rem 1rem;border-radius:10px;color:var(--text);font-weight:700;background:var(--surface);border:1px solid var(--line)}
.btn-ghost:hover{color:var(--text);background:var(--band)}
.hero-actions{display:flex;flex-wrap:wrap;gap:.55rem;margin:1.15rem 0 0}

.site-header{position:sticky;top:0;z-index:30;background:var(--surface,#fff);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:1rem;padding:.42rem 0;min-height:54px;min-width:0;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--text);font-weight:750;min-width:0}
.brand-mark{width:34px;height:34px;flex:0 0 auto}
.brand-name{color:var(--text);font-size:1.02rem}
.nav-desk{display:flex;flex-wrap:wrap;gap:.2rem .15rem;margin-left:auto}
.nav-desk a{color:var(--text);padding:.35rem .7rem;border-radius:var(--radius);font-weight:600}
.nav-desk a:hover{background:var(--band);color:var(--text)}
.nav-cta{margin-left:.4rem}
.nav-menu{display:none;margin-left:auto}
.nav-menu summary{cursor:pointer;list-style:none;padding:.4rem .8rem;border:1px solid var(--line);border-radius:999px;font-weight:650}
.nav-menu nav{display:flex;flex-direction:column;gap:.55rem;padding:.9rem 0}

.sec-hero{background:linear-gradient(180deg,var(--band) 0%,var(--surface) 55%,var(--bg) 100%);padding:calc(var(--sec-y) + .8rem) 0 var(--sec-y)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:2.4rem;align-items:center}
.hero-copy h1{max-width:none;font-size:clamp(1.85rem,3.3vw,2.55rem)}
.plat-row .plat-grid{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);gap:0;overflow:hidden}
.plat-row .plat-card{flex-direction:row;align-items:flex-start;gap:.85rem;background:transparent;border-radius:0;padding:1.15rem 1.1rem;box-shadow:none;border-right:1px solid var(--line)}
.plat-row .plat-grid li:last-child .plat-card{border-right:0}
.sec-tutorials.is-empty,.sec-latest.is-empty{padding:1.4rem 0}
.hero-scene{position:relative}
.vis-hero{width:100%;max-width:34rem;margin-left:auto;filter:drop-shadow(var(--shadow))}
.chip{position:absolute;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:.35rem .7rem;font-size:.8rem;font-weight:700;color:#1c2733;box-shadow:var(--shadow)}
.chip-msg{left:8%;bottom:14%}
.chip-file{right:6%;top:18%}
.chip-group{right:14%;bottom:8%}

.sec-platforms{padding:1.2rem 0 var(--sec-y)}
.plat-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem;list-style:none;margin:0;padding:0}
.plat-card{display:flex;flex-direction:column;gap:.85rem;height:100%;padding:1.15rem 1.1rem 1.2rem;border-radius:var(--radius);background:var(--band);color:var(--text)}
.plat-row .plat-card{min-height:0}
.plat-card em{display:block;color:var(--muted);font-style:normal;margin-top:.35rem;font-size:.92rem}
.plat-ico{width:2.5rem;height:2.5rem}

.sec-features{padding:var(--sec-y) 0;background:var(--band)}
.feat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.4rem 2.2rem;list-style:none;margin:0;padding:0}
.feat-card{padding:0;background:transparent;border:0;box-shadow:none}
.feat-ico{width:2.3rem;height:2.3rem;margin-bottom:.7rem}
.feat-card p{margin:0;color:var(--muted)}

.sec-tutorials{padding:var(--sec-y) 0}
.tut-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.1rem;list-style:none;margin:0;padding:0}
.tut-cards a{display:flex;flex-direction:column;gap:.5rem;height:100%;padding:1.25rem 1.2rem;border-radius:var(--radius);background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);color:var(--text)}
.tut-cards span{color:var(--muted)}
.tut-list,.tut-rest,.article-rows,.article-compact,.related-list{list-style:none;margin:0;padding:0}
.tut-lead{display:grid;grid-template-columns:140px 1fr;gap:1rem;align-items:center;padding:1.1rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--text);margin-bottom:1rem}

.split-story{padding:0 0 1rem}
.split-story .sec-head{padding-top:var(--sec-y)}
.story-row{padding:1.2rem 0 2.4rem}
.story-row.is-flip{background:var(--band)}
.story-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:2.4rem;align-items:center}
.story-row.is-flip .story-grid{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr)}
.story-row.is-flip figure{order:2}
.story-vis{width:100%;max-width:22rem;border-radius:var(--radius);box-shadow:var(--shadow);background:var(--surface);padding:.8rem}
.story-copy h3{font-size:1.45rem;line-height:1.3}
.story-copy p{margin:.2rem 0 0;color:var(--muted);font-size:1.05rem}

.sec-faq{padding:var(--sec-y) 0;background:var(--band)}
.faq-list{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.faq-list details{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.15rem;margin:0}
.faq-list summary{cursor:pointer;font-weight:700}
.faq-list details p{margin:.6rem 0 0;color:var(--muted)}

.sec-latest{padding:var(--sec-y) 0}
.article-rows li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:1rem;padding:1.05rem 0;border-bottom:1px solid var(--line);align-items:start}
.article-rows a{display:flex;flex-direction:column;gap:.3rem;color:var(--text);min-width:0}
.article-rows span,.article-rows time,.meta{color:var(--muted)}
.article-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem;list-style:none;margin:0;padding:0}
.article-cards a,.topic-card a,.quick-grid a,.files-grid li,.priv-cards li,.cta-box,.split-col{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem;color:var(--text)}

.site-footer{background:var(--band);border-top:1px solid var(--line);padding:2.4rem 0 1.4rem;color:var(--muted)}
.footer-name{margin:0 0 .4rem;color:var(--text);font-weight:750}
.footer-label{margin:0 0 .55rem;font-weight:700;color:var(--text)}
.footer-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr 1.2fr;gap:1.5rem}
.footer-grid ul{list-style:none;margin:0;padding:0}
.footer-grid a,.footer-nav a{color:var(--text)}
.footer-copy{margin-top:1.4rem;padding-top:1rem;border-top:1px solid var(--line)}
.footer-nav,.footer-compact,.editorial-foot nav{display:flex;flex-wrap:wrap;gap:.8rem 1.1rem}
.editorial-foot{display:flex;justify-content:space-between;gap:1rem}

.article-page{padding:2.2rem 0 3.2rem}
.reading{max-width:40.5rem}
.reading-narrow,.help-article{max-width:40.5rem;margin:0 auto}
.title-block{margin:0 0 1.5rem}
.crumb{margin:0 0 .75rem}
.crumb a{color:var(--muted)}
.article-body{font-size:1.0625rem;line-height:1.92}
.article-body p{margin:0 0 1.05rem}
.article-body h2{margin:1.7rem 0 .65rem;font-size:1.28rem;line-height:1.4}
.article-body h3{margin:1.35rem 0 .5rem;font-size:1.08rem}
.article-body ul,.article-body ol{padding-left:1.25rem;margin:0 0 1.1rem}
.article-body li{margin:0 0 .4rem}
.article-body a{text-decoration:underline;text-underline-offset:3px}
.article-body code{font-family:Consolas,"Sarasa Mono SC",ui-monospace,monospace;font-size:.9em;background:var(--band);padding:.05em .35em;border-radius:4px}
.article-body pre{font-family:Consolas,"Sarasa Mono SC",ui-monospace,monospace;font-size:.9rem;line-height:1.6;background:var(--band);padding:1rem 1.1rem;border-radius:8px;overflow:auto;margin:0 0 1.2rem}
.article-body pre code{background:transparent;padding:0}
.dek{max-width:36rem;line-height:1.7}
.toc-grid,.rail-grid{display:grid;grid-template-columns:15rem minmax(0,1fr);gap:2rem;align-items:start}
.toc,.side-rail{background:var(--band);border:1px solid var(--line);border-radius:var(--radius);padding:1rem;position:sticky;top:5.2rem}
.related{margin-top:2.4rem}
.related-list li,.side-rail li,.help-steps li,.article-compact li,.tut-list li{padding:.75rem 0;border-bottom:1px solid var(--line)}
.related a,.help-steps a,.side-rail a,.tut-list a{color:var(--text)}
.related-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem}
.related-cards li{border:0;padding:0}
.related-cards a{display:block;padding:.85rem .95rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--text)}
.mag-band{padding:2.2rem 0 1rem;background:var(--band);margin-bottom:1.6rem}
.step-list,.install-steps,.priv-check,.desk-points,.mobile-points,.group-list{list-style:none;margin:0;padding:0}
.step-list li,.install-steps li,.priv-check li{display:grid;grid-template-columns:2.4rem 1fr;gap:.9rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.step-num,.install-steps b,.priv-check span{display:flex;align-items:center;justify-content:center;width:2.4rem;height:2.4rem;border-radius:999px;background:var(--accent);color:#fff;font-weight:700}
.quick-grid,.topic-grid,.files-grid,.priv-cards,.related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;list-style:none;margin:0;padding:0}
.split-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.4rem}
.sec-intro,.sec-install,.sec-desktop,.sec-mobile,.sec-groups,.sec-featured{padding:var(--sec-y) 0}
.intro-grid,.install-grid,.desk-grid,.mobile-grid,.groups-grid,.featured-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:2rem;align-items:center}
.priv-band{display:grid;grid-template-columns:180px 1fr;gap:1.5rem;align-items:center}
figcaption{color:var(--muted);font-size:.9rem;margin-top:.6rem}

@media (max-width:1100px){
  .plat-grid,.tut-cards,.article-cards,.faq-list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .plat-row .plat-grid li:nth-child(2) .plat-card{border-right:0}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:800px){
  .plat-row .plat-grid{border:0;background:transparent;overflow:visible}
  .plat-row .plat-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--band);margin:0 0 .7rem}
  .nav-desk,.hdr-product .nav-cta{display:none}
  .nav-menu{display:block}
  .hero-grid,.feat-grid,.plat-grid,.tut-cards,.article-cards,.story-grid,.split-grid,.toc-grid,.rail-grid,.intro-grid,.install-grid,.desk-grid,.mobile-grid,.groups-grid,.featured-grid,.quick-grid,.topic-grid,.files-grid,.priv-band,.cta-box,.tut-lead,.faq-list,.related-cards{grid-template-columns:1fr}
  .story-row.is-flip .story-grid,.story-row.is-flip figure{order:0}
  .header-inner{align-items:center}
  .sec-hero{padding:2.4rem 0 2rem}
  .chip-file,.chip-group{display:none}
  .article-rows li{grid-template-columns:1fr}
}