:root{--ink:#111;--mut:#6b6b6b;--dim:#a8a8a8;--bg:#fff;--soft:#f2f2f2;--hair:#e5e5e5;--ease:cubic-bezier(.2,.8,.2,1)}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.ln{fill:none;stroke:var(--ink);stroke-width:1.4;stroke-linejoin:round;stroke-linecap:round;transition:stroke .35s var(--ease),fill .35s var(--ease)}
.ln.thin{stroke-width:1}.ln.dash{stroke-dasharray:5 4}.ln.fill{fill:#fff}.ink{fill:var(--ink);transition:fill .35s}
/* header */
.top{position:sticky;top:0;z-index:20;height:52px;background:#111;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 20px}
.logo img{height:26px;display:block}
.top-r{display:flex;align-items:center;gap:14px}
.langsw{position:relative}.langsw button{background:none;border:0;color:#ddd;font:inherit;font-size:13px;display:flex;align-items:center;gap:6px;cursor:pointer}
.langsw svg{width:14px;height:14px}.langsw .ln{stroke:#ddd}
.langsw .menu{position:absolute;right:0;top:30px;background:#fff;border-radius:8px;box-shadow:0 8px 28px rgba(0,0,0,.2);padding:6px;min-width:120px;opacity:0;transform:translateY(-4px);pointer-events:none;transition:.2s var(--ease)}
.langsw .menu a{display:block;padding:8px 10px;color:#111;font-size:13px;border-radius:6px}.langsw .menu a:hover{background:var(--soft)}
.langsw.open .menu{opacity:1;transform:none;pointer-events:auto}
.tsearch{display:flex;align-items:center;background:#222;border:1px solid #333;border-radius:8px;padding:0 8px;height:30px;transition:border-color .2s}
.tsearch:focus-within{border-color:#777}
.tsearch input{background:none;border:0;outline:0;color:#fff;width:110px;font:inherit;font-size:13px}
kbd{font:11px/1 inherit;color:#888;border:1px solid #444;border-radius:4px;padding:2px 4px}
/* layout */
.wrap{display:flex;max-width:1240px;margin:0 auto}
.side{width:210px;flex:none;padding:28px 20px;position:sticky;top:52px;height:calc(100vh - 52px);display:flex;flex-direction:column;gap:4px}
.side a,.side span{font-size:13.5px;color:var(--mut);padding:6px 0;line-height:1.35;transition:color .2s}
.side a.on{color:var(--ink);font-weight:600}.side a:hover{color:var(--ink)}
.side .off{opacity:.55}.side em{font-style:normal;font-size:11px;margin-left:6px;border:1px dashed #aaa;border-radius:10px;padding:0 6px}
main{flex:1;min-width:0;padding:30px 36px 60px}
.hero{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:28px}
h1{font-weight:500;font-size:34px;line-height:1.2;margin:0;letter-spacing:-.01em;color:var(--mut)}
h1 .hi{color:var(--ink)}
.search{display:flex;align-items:center;gap:8px;border:1px solid var(--hair);border-radius:999px;padding:0 14px;height:40px;width:340px;max-width:100%;margin-top:10px;transition:border-color .2s,box-shadow .2s}
.search:focus-within{border-color:#111;box-shadow:0 0 0 4px rgba(0,0,0,.05)}
.search svg{width:16px;height:16px}.search input{flex:1;border:0;outline:0;font:inherit;font-size:14px;background:none}
.search kbd{color:#aaa;border-color:#ddd}

/* ---------------- bookshelf ---------------- */
.shelf{width:100%;height:auto;display:block;overflow:visible}
.shelf .wall{fill:#f3f3f3}
.shelf .draw{stroke-dasharray:1;stroke-dashoffset:1;animation:draw 1.2s var(--ease) .1s forwards}
@keyframes draw{to{stroke-dashoffset:0}}
.shelf .deco,.shelf .mono{opacity:0;animation:fade .6s var(--ease) .7s forwards}
@keyframes fade{to{opacity:1}}
.shelf .box{opacity:0;animation:rise .7s var(--ease) forwards;animation-delay:var(--d)}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.shelf .side{stroke-dasharray:4 4;stroke-width:1;transition:opacity .35s}
.shelf .front{fill:#f6f6f6}
.shelf .pp{fill:#fff;stroke:var(--ink);stroke-width:1.2;transition:stroke .35s}
.shelf .lbl{font-size:17px;fill:var(--ink);transition:fill .35s,font-weight .2s}
.shelf .soon{font-size:11px;fill:#999;letter-spacing:.06em}
.shelf .box.off .front{stroke-dasharray:5 4;fill:#fafafa}.shelf .box.off .lbl{fill:#999}
.shelf .box.off .pp,.shelf .box.off .ln{stroke:#b5b5b5}
/* moving parts */
.shelf .pull,.shelf .paper{transform-box:fill-box;transition:transform .55s var(--ease)}
.shelf .pull{transform-origin:50% 100%}
.shelf .paper{transform-origin:50% 100%}
.shelf a.box{cursor:pointer;outline:none}
/* hovered (or focused) box is pulled out towards you, contents fan out */
.shelf .box.is-on .pull{transform:translateY(12px) scale(1.07)}
.shelf .box.is-on .front{fill:#fff}
.shelf .box.is-on .lbl{fill:#000}
.shelf .box.is-on .side{opacity:.25}
.shelf .box.is-on .p1{transform:translate(-10px,-26px) rotate(-6deg);transition-delay:.04s}
.shelf .box.is-on .p2{transform:translate(12px,-34px) rotate(5deg);transition-delay:.08s}
.shelf .box.is-on .p3{transform:translate(0,-20px) rotate(-2deg);transition-delay:.12s}
.shelf .box.is-on .sig{stroke-dasharray:120;stroke-dashoffset:120;animation:sign .9s var(--ease) .25s forwards}
@keyframes sign{to{stroke-dashoffset:0}}
.shelf .box.is-on .chart{stroke-dasharray:120;stroke-dashoffset:120;animation:sign .8s var(--ease) .2s forwards}
.shelf .box.off.is-on .pull{transform:translateY(4px) scale(1.02)}
/* everything else steps back */
.shelf.has-on .box:not(.is-on) .front{fill:#f1f1f1;stroke:var(--dim)}
.shelf.has-on .box:not(.is-on) .lbl{fill:var(--dim)}
.shelf.has-on .box:not(.is-on) .pp,.shelf.has-on .box:not(.is-on) .ln{stroke:#c4c4c4}
.shelf.has-on .box:not(.is-on) .ink{fill:#c4c4c4}
.shelf .mono{transform:translate(796px,150px);transition:transform .6s var(--ease),opacity .6s}
.shelf.has-on .mono{transform:translate(796px,150px) rotate(-4deg)}
.shelf-m{display:none;list-style:none;padding:0;margin:0}
hr{border:0;border-top:1px solid var(--hair);margin:56px 0 44px}
h2{font-weight:500;font-size:30px;line-height:1.2;margin:0 0 30px}h2 span{color:var(--mut)}
/* scroll reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
/* collection rows */
.row{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:22px;margin-bottom:34px}
.card{background:var(--soft);display:flex;align-items:center;justify-content:space-between;padding:32px;min-height:200px;transition:background .35s var(--ease)}
.card:hover{background:#ebebeb}
.card h3{font-weight:500;font-size:18px;margin:0 0 4px}.card p{margin:0 0 16px;font-size:17px;color:var(--mut);line-height:1.35;max-width:270px}
.pill{display:inline-block;background:#111;color:#fff;border-radius:999px;font-size:12px;padding:5px 11px;transition:transform .25s var(--ease)}
.card:hover .pill{transform:translateX(4px)}
.art{width:180px;height:auto;flex:none;overflow:visible}
.art *{transform-box:fill-box;transform-origin:center;transition:transform .7s var(--ease)}
.card:hover .art-media .a1{transform:translate(-6px,-4px)}.card:hover .art-media .a2{transform:translate(6px,-8px) rotate(6deg)}
.card:hover .art-media .a3{transform:translate(-4px,6px)}.card:hover .art-media .a4{transform:translate(6px,4px)}
.art-priv .arms{transform-origin:100px 70px;transform-box:view-box}
.in .art-priv .arms{animation:spin 18s linear infinite}
.card:hover .art-priv .arms{animation-duration:4s}
@keyframes spin{to{transform:rotate(360deg)}}
.art-cen .bar{transform-origin:50% 100%;transform:scaleY(.2)}
.in .art-cen .bar{transform:none}.in .art-cen .b2{transition-delay:.1s}.in .art-cen .b3{transition-delay:.2s}.in .art-cen .b4{transition-delay:.3s}
.art-cen .line{stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 1.2s var(--ease) .4s}
.in .art-cen .line{stroke-dashoffset:0}
.card:hover .art-cen .b4{transform:scaleY(1.12)}
.list{list-style:none;margin:0;padding:0;align-self:center}
.list li a{display:flex;gap:12px;align-items:center;padding:13px 4px;border-bottom:1px solid var(--hair);font-size:14px;transition:padding .3s var(--ease)}
.list li:last-child a{border-bottom:0}
.list .n{color:#999;font-variant-numeric:tabular-nums}.list .t{flex:1}
.list .ar{opacity:0;transform:translateX(-6px);transition:.3s var(--ease)}
.list a:hover{padding-left:10px}.list a:hover .ar{opacity:1;transform:none}
/* more */
.more{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.mcard{border:1px solid var(--hair);padding:22px;display:flex;flex-direction:column;gap:8px;min-height:190px;transition:border-color .3s,transform .3s var(--ease),opacity .7s var(--ease)}
.mcard:hover{border-color:#111;transform:translateY(-3px)}
.mcard:nth-child(2){transition-delay:.06s}.mcard:nth-child(3){transition-delay:.12s}.mcard:nth-child(4){transition-delay:.18s}
.mcard .ic{width:22px;height:22px}.mcard h4{margin:6px 0 0;font-weight:600;font-size:15px}
.mcard p{margin:0;color:var(--mut);font-size:13px;line-height:1.5;flex:1}.mcard .cta{font-size:13px}
.mcard i{font-style:normal;display:inline-block;transition:transform .3s var(--ease)}.mcard:hover i{transform:translateX(4px)}
.tz{margin-top:40px;font-size:12px;color:#999}
footer{border-top:1px solid var(--hair);margin-top:20px}
.f-in{max-width:1240px;margin:0 auto;padding:22px 36px;display:flex;align-items:center;gap:16px;flex-wrap:wrap;font-size:12px;color:var(--mut)}
.flogo{height:16px}.f-in nav{margin-left:auto;display:flex;gap:18px}.f-in a:hover{color:var(--ink)}
@media (max-width:1000px){.more{grid-template-columns:repeat(2,1fr)}}
@media (max-width:820px){
  .side{display:none}main{padding:24px 16px 48px}
  .hero{flex-direction:column}h1{font-size:28px}.search{width:100%}.tsearch{display:none}
  .shelf{display:none}.shelf-m{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .shelf-m a,.shelf-m div{display:flex;flex-direction:column;gap:4px;border:1px solid var(--ink);padding:16px 14px;min-height:100px;background:var(--soft);transition:background .2s,transform .2s}
  .shelf-m a:active{transform:scale(.98);background:#e8e8e8}
  .shelf-m b{font-weight:500;font-size:15px}.shelf-m span{font-size:12px;color:var(--mut)}
  .shelf-m .off div{border-style:dashed;background:#fff;color:#999}
  .row{grid-template-columns:1fr}.card{padding:22px}.art{width:120px}
  h2{font-size:24px}.more{grid-template-columns:1fr}
  .f-in{padding:20px 16px}.f-in nav{margin-left:0}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}
  .shelf .draw{stroke-dashoffset:0}.shelf .box,.shelf .deco,.shelf .mono,.reveal{opacity:1;transform:none}}