:root{--bg:#fff;--ink:#0f172a;--mute:#5b6476;--line:#e3e8ef;--brand:#2f7cf6;--brand2:#1d5fd1;--soft:#f3f6fb;--ok:#0f8a5f;--err:#c2410c}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--brand2)}
.top{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px 24px;padding:12px 20px;border-bottom:1px solid var(--line);max-width:1180px;margin:0 auto}
.brand{display:flex;gap:8px;align-items:center;font-weight:700;color:var(--ink);text-decoration:none}
.tag{font-size:11px;font-weight:500;color:var(--mute);border:1px dashed var(--line);border-radius:6px;padding:0 6px}
.header-nav{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px}
.top nav{display:flex;align-items:center;gap:18px}
.top nav a{text-decoration:none;color:var(--mute);font-size:15px;padding:7px 0}
.top nav a:hover{color:var(--brand2)}
.top .language-switch{gap:8px;white-space:nowrap}
.language-switch span{color:var(--line)}
.top nav a[aria-current="page"]{color:var(--brand2);font-weight:650}
:focus-visible{outline:2px solid var(--brand);outline-offset:4px}
main{max-width:1180px;margin:0 auto;padding:0 20px}
.hero{text-align:center;padding:28px 0 8px}
.hero h1{font-size:clamp(28px,4.5vw,42px);line-height:1.15;margin:0 0 8px;letter-spacing:-.02em}
.sub{color:var(--mute);margin:0 0 14px}
.home-hero{max-width:820px;margin:auto;padding:64px 0 32px}
.home-hero h1{font-size:clamp(32px,5vw,52px);line-height:1.2;margin-bottom:18px}
.home-hero .sub{max-width:640px;margin:0 auto 22px;font-size:18px}
.home-actions{margin:26px 0 0}
a.primary{display:inline-block;text-decoration:none}
.home-note{color:var(--mute);font-size:14px;margin:12px 0 0}
.features{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;max-width:960px;margin:14px auto 40px}
.features section{border-top:2px solid var(--line);padding-top:12px}
.features h2{font-size:19px;margin:0 0 8px}
.features p{color:var(--mute);margin:0}
html[lang="zh-CN"] .content{line-height:1.85}
html[lang="zh-CN"] .hero h1{line-height:1.3;letter-spacing:0}
.privacy{display:inline-flex;gap:8px;align-items:center;background:#e9f8f1;color:#0b5e41;border:1px solid #bfe9d6;border-radius:999px;padding:7px 16px;margin:0;font-size:15px}
.tool{margin:20px 0}
.dropzone{border:2px dashed #b9c6da;border-radius:16px;background:var(--soft);padding:42px 20px;text-align:center;cursor:pointer;color:var(--mute);transition:.15s}
.dropzone:hover,.dropzone:focus,.dropzone.over{border-color:var(--brand);background:#eaf2ff;color:var(--brand2);outline:none}
.dropzone p{margin:6px 0}.dropzone strong{color:var(--ink)}.hint{font-size:13px}
.workspace{display:none;gap:18px;grid-template-columns:minmax(0,1fr) 320px}
.viewer-col,.panel{min-width:0}
.tool.loaded .workspace{display:grid}.tool.loaded .dropzone{display:none}
.viewer{height:min(62vh,560px);min-height:300px;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:#f3f5f9}
.viewer canvas{width:100%;height:100%;display:block;touch-action:none}
.viewer-hint{font-size:12px;color:var(--mute);margin:6px 2px 0}
.panel{display:flex;flex-direction:column;gap:14px}
.stats{margin:0;display:grid;gap:8px}
.stats div{background:var(--soft);border-radius:10px;padding:8px 12px}
.stats dt{font-size:12px;color:var(--mute)}.stats dd{margin:0;font-weight:650;font-variant-numeric:tabular-nums}
.obj-head{display:flex;align-items:center;gap:8px;justify-content:space-between;flex-wrap:wrap}
.obj-head h2{font-size:15px;margin:0}
.obj-head select{font:inherit;font-size:13px;padding:3px 6px;border-radius:8px;border:1px solid var(--line);max-width:100%}
.objects{list-style:none;margin:6px 0 0;padding:0;max-height:220px;overflow:auto;border:1px solid var(--line);border-radius:10px}
.objects li{display:grid;grid-template-columns:auto auto 1fr;gap:4px 8px;align-items:center;padding:7px 10px;border-bottom:1px solid var(--line)}
.objects li:last-child{border:0}
.objects label{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px;cursor:pointer}
.objects small{grid-column:3;color:var(--mute);font-size:12px;margin-top:-4px}
.swatch{width:12px;height:12px;border-radius:3px}
.actions{display:grid;gap:8px}
button{font:inherit;cursor:pointer}
.primary,.secondary{border-radius:10px;padding:11px 14px;font-weight:600;border:1px solid transparent}
.primary{background:var(--brand);color:#fff}.primary:hover{background:var(--brand2)}
.secondary{background:#fff;color:var(--brand2);border-color:#bcd2f8}
.primary:disabled,.secondary:disabled{opacity:.45;cursor:not-allowed}
.link{background:none;border:0;color:var(--brand2);padding:0;font-size:14px}
.warnings{margin:0;padding-left:18px;font-size:13px;color:#8a5a00;overflow-wrap:anywhere}
.status{min-height:1.4em;font-size:14px;color:var(--mute);margin:10px 0 0;overflow-wrap:anywhere}
.status.ok{color:var(--ok)}.status.error{color:var(--err)}.status.busy{color:var(--brand2)}
.content{max-width:760px;margin:0 auto 40px}
.content h2{font-size:24px;margin:34px 0 8px;letter-spacing:-.01em}
.content li{margin:4px 0}
details{border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin:8px 0}
summary{font-weight:600;cursor:pointer}details p{margin:8px 0 0}
.foot{border-top:1px solid var(--line);text-align:center;color:var(--mute);font-size:13px;padding:18px}
@media (max-width:820px){.tag{display:none}.privacy{display:block;border-radius:14px;text-align:center}.privacy svg{vertical-align:-3px}.tool.loaded .workspace{grid-template-columns:1fr}.viewer{height:44vh}.dropzone{padding:32px 14px}.home-hero{padding:38px 0 24px}.features{grid-template-columns:1fr;gap:20px}}
@media (max-width:560px){.top{padding:12px 16px;gap:4px}.header-nav{width:100%;justify-content:space-between;gap:4px 12px}.top nav{gap:12px}.top nav a{font-size:14px}main{padding:0 16px}.hero{padding-top:24px}}