:root{--bg: #fbfbfc;--bg-elev: #f1f2f4;--bg-stage: #fcfcfd;--border: #e3e5ea;--border-strong: #d4d7de;--text: #1a1c20;--text-dim: #4b515b;--text-faint: #6b7280;--accent: #2f6bff;--accent-soft: rgba(47, 107, 255, .1);--coral: #ff6a3d;--radius: 12px;--sidebar-w: 296px;font-synthesis:none;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;font-size:15.5px;line-height:1.55}#app{display:grid;grid-template-columns:var(--sidebar-w) 1fr;height:100vh;overflow:hidden}#sidebar{background:var(--bg-elev);border-right:1px solid var(--border);overflow-y:auto;padding:18px 0 48px}.sidebar-title{padding:8px 22px 16px;font-size:16px;font-weight:650;letter-spacing:-.01em;color:var(--text)}.sidebar-title small{display:block;margin-top:3px;font-size:13px;font-weight:400;color:var(--text-faint)}.cat-group{margin-top:10px}.cat-head{display:flex;align-items:center;gap:8px;width:100%;border:0;background:none;text-align:left;padding:10px 22px 7px;font-size:16.5px;font-weight:700;letter-spacing:-.01em;color:var(--text);cursor:pointer;transition:color .12s}.cat-head:hover{color:var(--accent)}.cat-chevron{flex:none;width:0;height:0;border-left:5px solid currentColor;border-top:4px solid transparent;border-bottom:4px solid transparent;margin-right:1px;transform:rotate(90deg);transform-origin:30% 50%;transition:transform .18s ease;opacity:.55}.cat-group.collapsed .cat-chevron{transform:rotate(0)}.cat-name{flex:1}.cat-items{display:grid;grid-template-rows:1fr;transition:grid-template-rows .22s ease}.cat-group.collapsed .cat-items{grid-template-rows:0fr}.cat-items-inner{overflow:hidden;min-height:0}@media(prefers-reduced-motion:reduce){.cat-items,.cat-chevron{transition:none}}.effect-link{display:block;width:100%;text-align:left;border:0;background:none;color:var(--text-dim);padding:7px 22px 7px 26px;font-size:15px;cursor:pointer;border-left:2px solid transparent;transition:color .12s,background .12s,border-color .12s}.effect-link:hover{color:var(--text);background:#00000009}.effect-link.active{color:var(--accent);background:var(--accent-soft);border-left-color:var(--accent);font-weight:550}#stage-panel{position:relative;display:flex;flex-direction:column;min-width:0;overflow:hidden}#stage-header{padding:24px 32px 20px;border-bottom:1px solid var(--border);flex:none}.sh-cat{font-size:12.5px;font-weight:600;letter-spacing:.01em;color:var(--text-faint);margin-bottom:8px}.sh-title{font-size:26px;font-weight:680;letter-spacing:-.015em;margin:0;color:var(--text);text-wrap:balance}.sh-title .sh-en{font-size:17px;font-weight:400;color:var(--text-faint);letter-spacing:0}.sh-def{margin:10px 0 0;max-width:70ch;color:var(--text-dim);font-size:15px}.sh-note{margin:13px 0 0;max-width:72ch;padding:11px 15px;background:var(--accent-soft);border:1px solid rgba(47,107,255,.18);border-radius:10px;color:var(--text);font-size:14px}.sh-note b{color:var(--accent);font-weight:600}.lang-toggle{position:absolute;top:20px;right:28px;z-index:20;display:inline-flex;padding:3px;gap:2px;background:var(--bg-elev);border:1px solid var(--border-strong);border-radius:10px}.lang-toggle button{border:0;background:none;color:var(--text-dim);font-size:13.5px;font-weight:550;padding:5px 13px;border-radius:7px;cursor:pointer;transition:color .12s,background .12s}.lang-toggle button:hover{color:var(--text)}.lang-toggle button.active{background:var(--bg);color:var(--accent);box-shadow:0 1px 3px #00000014}.made-by{display:inline-block;margin-top:8px;font-size:12px;font-weight:400;color:var(--text-faint);text-decoration:none}.made-by:hover{color:var(--accent)}.credit-corner{position:absolute;bottom:14px;right:20px;z-index:6;font-size:12px}.credit-corner a{color:var(--text-faint);text-decoration:none}.credit-corner a:hover{color:var(--accent)}#nav-toggle,#backdrop{display:none}@media(max-width:720px){#app{grid-template-columns:1fr}#sidebar{position:fixed;top:0;left:0;bottom:0;width:84%;max-width:320px;max-height:none;transform:translate(-100%);transition:transform .25s ease;z-index:60;box-shadow:0 0 40px #0000002e}#sidebar.open{transform:none}#backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;opacity:0;pointer-events:none;transition:opacity .25s ease;z-index:55}#backdrop.open{opacity:1;pointer-events:auto}#nav-toggle{display:inline-flex;align-items:center;justify-content:center;position:absolute;top:10px;left:12px;z-index:30;width:38px;height:34px;border:1px solid var(--border-strong);background:var(--bg);border-radius:9px;font-size:17px;color:var(--text);cursor:pointer}.lang-toggle{top:11px;right:12px}#stage-header{padding:54px 16px 14px}.sh-title{font-size:21px}.sh-title .sh-en,.sh-def{font-size:14px}.stage-canvas,.stage-split{transform:scale(.78)}.credit-corner{right:12px;bottom:10px}}@media(max-width:460px){.stage-canvas,.stage-split{transform:scale(.6)}}#stage{position:relative;flex:1;min-height:0;overflow:hidden;background:var(--bg-stage);background-image:radial-gradient(circle at 1px 1px,rgba(0,0,0,.045) 1px,transparent 0);background-size:26px 26px}.stage-canvas{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;padding:40px}.stage-split{display:flex;gap:32px;align-items:center;justify-content:center;flex-wrap:wrap;width:100%;height:100%;padding:40px}.split-cell{display:flex;flex-direction:column;align-items:center;gap:12px}.split-label{font-size:13px;color:var(--text-faint)}.split-label.good{color:#0e9f6e}.split-label.bad{color:#e5484d}.demo-box{width:96px;height:96px;border-radius:18px;background:var(--coral);box-shadow:0 10px 28px #ff6a3d47,inset 0 1px #ffffff40}.stage-controls{position:absolute;left:0;right:0;bottom:0;display:flex;align-items:center;gap:14px;padding:14px 22px;background:linear-gradient(transparent,#fbfbfce6);z-index:5}.ctrl-btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--border-strong);background:var(--bg);color:var(--text);padding:8px 16px;border-radius:9px;font-size:14px;font-weight:500;cursor:pointer;box-shadow:0 1px 2px #0000000d;transition:border-color .12s,background .12s}.ctrl-btn:hover{border-color:var(--accent);color:var(--accent)}.ctrl-hint{font-size:13px;color:var(--text-faint)}.ctrl-slider{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--text-dim)}.ctrl-slider input[type=range]{accent-color:var(--accent)}.fps-meter{position:absolute;top:14px;right:16px;font-variant-numeric:tabular-nums;font-size:13px;color:var(--text-dim);background:var(--bg);border:1px solid var(--border-strong);border-radius:9px;padding:5px 11px;z-index:5}.stage-empty{margin:auto;color:var(--text-faint);font-size:15px}