:root{--paper:#eff0ed;--ink:#303431;--muted:#686e69;--line:#cdd2cc;--accent:#b93632;--accent-ink:#b93632;--font:Arial,'Microsoft YaHei',sans-serif;--mono:'Courier New',monospace}
*{box-sizing:border-box}
body{margin:0;min-height:100svh;display:flex;flex-direction:column;background:var(--paper);color:var(--ink);font:14px var(--font);-webkit-font-smoothing:antialiased}
button,a{-webkit-tap-highlight-color:transparent}
button{font:inherit;cursor:pointer;color:inherit}
a{color:inherit;text-decoration:none}
button:focus-visible,a:focus-visible,.panel:focus-visible{outline:2px solid var(--accent);outline-offset:6px}
::selection{background:var(--accent);color:var(--paper)}
main{width:calc(100% - 80px);max-width:1440px;margin:auto;flex:1}
.panel{padding:30px 0 60px}.panel[hidden]{display:none}



#panel-home{padding:0;min-height:calc(100svh - 160px);display:grid;place-items:center}
#panel-home[hidden]{display:none}
.pelican-scene{width:min(100%,960px);margin:0 auto;padding:8px 0 24px}
#pelican-canvas{display:block;width:100%;height:auto;aspect-ratio:1000/620}
.ride-caption{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:16px;max-width:720px;margin:0 auto;padding:0 28px}
.ride-caption p{grid-column:2;margin:0;text-align:center;font-size:16px;letter-spacing:.12em;color:var(--ink)}
.ride-toggle{grid-column:3;justify-self:end;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:8px 0 8px 12px;background:none;border:0;color:var(--muted);font-size:12px}
.ride-toggle:hover{color:var(--accent)}
.ride-toggle svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.ride-toggle .play-icon{display:none}
.ride-toggle[aria-pressed="true"] .pause-icon{display:none}
.ride-toggle[aria-pressed="true"] .play-icon{display:block}
.empty-panel{min-height:450px}
.lab-panel{padding-top:30px}
.lab-intro{display:flex;align-items:baseline;gap:22px;border-bottom:1px solid var(--line);padding-bottom:22px}
.lab-intro .eyebrow{font:10px var(--mono);color:var(--accent);margin:0}
.lab-intro h1{font:400 clamp(42px,6vw,82px)/1 Georgia,'Times New Roman',serif;margin:0;letter-spacing:-3px}
.lab-description{margin:0 0 0 auto;color:var(--muted);font-size:12px}
.lab-workspace{display:grid;grid-template-columns:220px 1fr;gap:28px;padding-top:28px}
.lab-controls{display:flex;flex-direction:column;gap:22px;padding-right:22px;border-right:1px solid var(--line)}
.lab-controls label{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:center;font-size:12px}
.lab-controls output{font:11px var(--mono);color:var(--accent)}
.lab-controls input{grid-column:1 / -1;width:100%;accent-color:var(--accent)}
.lab-action{border:1px solid var(--line);background:transparent;text-align:left;padding:12px 14px;font-size:12px;margin-top:auto}
.lab-action:hover{border-color:var(--accent);color:var(--accent)}
.lab-canvas{min-height:330px;background:#e4e7e2;padding:26px 24px;display:flex;flex-direction:column;justify-content:center}
.lab-bars{height:230px;display:flex;align-items:center;gap:clamp(4px,1vw,12px);border-bottom:1px solid #c2c8c1}
.lab-bars i{display:block;flex:1;height:var(--bar-height);background:var(--accent);animation:lab-wave var(--lab-speed) ease-in-out var(--bar-delay) infinite alternate;transform-origin:center}
.lab-scale{display:flex;justify-content:space-between;padding-top:12px;font:10px var(--mono);color:var(--muted)}
@keyframes lab-wave{from{transform:scaleY(.48)}to{transform:scaleY(1)}}
footer{width:calc(100% - 80px);max-width:1440px;margin:auto;padding:18px 0;display:flex;justify-content:flex-end;align-items:center;color:var(--muted);font:10px var(--mono)}
@media(min-width:1600px){.panel{padding-top:40px}}
@media(max-width:900px){main,footer{width:calc(100% - 48px)}}
@media(max-width:600px){main,footer{width:calc(100% - 36px)}.panel{padding-top:24px;padding-bottom:35px}.empty-panel{min-height:60svh}#panel-home{min-height:calc(100svh - 145px)}.pelican-scene{width:calc(100% + 28px);margin-left:-14px;padding:0 0 28px}.ride-caption{padding:12px 24px 0}.ride-caption p{font-size:14px}.lab-intro{display:block}.lab-intro h1{font-size:54px;margin:12px 0}.lab-description{margin:0}.lab-workspace{grid-template-columns:1fr;gap:24px}.lab-controls{border-right:0;border-bottom:1px solid var(--line);padding:0 0 22px;display:grid;grid-template-columns:1fr 1fr;gap:16px}.lab-action{margin-top:0}.lab-canvas{min-height:240px;padding:18px 14px}.lab-bars{height:150px}}
@media(max-width:600px){.ride-caption{grid-template-columns:minmax(0,1fr);gap:0}.ride-caption p,.ride-toggle{grid-column:1}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}