:root{--bg:#100e27;--panel:#1a1638;--line:#e3d9ff1b;--muted:#a8a0c4;--white:#eeeafa;--gold:#e8cb99;--blue:#9acee0;--lilac:#c6b0eb}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--white);font-family:system-ui,-apple-system,"PingFang SC",sans-serif}button,input,select{font:inherit}button{cursor:pointer;color:inherit;background:transparent;border:1px solid var(--line);border-radius:4px}button:hover{border-color:#e8cb9970;background:#e8cb990c}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--gold);outline-offset:3px}button:disabled{opacity:.5;cursor:default}a{color:var(--gold);text-decoration:none}a:hover{text-decoration:underline}.sr-only{position:absolute;clip:rect(0,0,0,0);width:1px;height:1px;overflow:hidden;white-space:nowrap}#app{height:100dvh;min-height:680px;display:flex;flex-direction:column;overflow:hidden}header{height:66px;flex-shrink:0;display:flex;align-items:center;gap:28px;padding:0 24px;border-bottom:1px solid var(--line);background:#120e29}.brand{border:0;padding:0;display:flex;align-items:center;gap:13px;font-family:"Songti SC",serif;font-size:23px;letter-spacing:2px}.brand:hover{background:transparent}.seal{width:33px;height:37px;display:grid;place-items:center;border:1px solid #e8cb9973;color:var(--gold);font-size:25px;position:relative}.seal:after{content:'';position:absolute;inset:3px;border:1px solid #e8cb9923}.brand-sub{font-family:system-ui;font-size:10px;letter-spacing:3px;margin-left:12px;color:var(--muted)}.header-note{border-left:1px 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span{width:35px;height:35px;border:1px solid #bba8e367;border-radius:50%;background:#21193bed;display:grid;place-items:center;font-family:serif;font-size:16px;box-shadow:0 0 0 5px #9b80bb0d;transition:all .3s}.world-nav button em{font-size:10px;letter-spacing:1px;font-style:normal;color:#d2c3e1;background:#1b143dc9;padding:3px 5px;border-radius:2px;white-space:nowrap}.world-nav button:hover span,.world-nav button.active span{border-color:var(--gold);color:var(--gold);background:#45334c;box-shadow:0 0 18px #e8cb9930,0 0 0 5px #e8cb9909}.world-nav button.done span{color:var(--gold);border-color:#e8cb9990}.world-nav button.done em:after{content:' · 已学';font-size:8px;color:var(--gold)}.is-demo .world-nav button{opacity:.33}.is-demo .world-nav button.active{opacity:1}.legend{position:absolute;left:24px;bottom:64px;display:flex;gap:18px;font-size:9px;color:#b8aecf;pointer-events:none}.legend 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var(--line);font-size:13px;line-height:1.8;z-index:9}#webgl-fallback[hidden]{display:none}@media(min-width:1500px){.sidebar{width:450px}.panel-scroll{padding:30px}.world-heading{top:30px;left:35px}h1{font-size:29px}}@media(max-width:1150px){.sidebar{width:350px}.panel-scroll{padding:21px}.brand-sub,.header-note{display:none}.step-caption{min-width:180px}.step-caption div>span{max-width:135px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}footer{gap:15px;padding:0 18px}.loop-label{display:none}.course-card{gap:7px;padding:12px 8px}.course-card strong{font-size:11px}.course-card small{font-size:8px}h1{font-size:22px}.world-heading{left:20px}.drag-hint{display:none}.player-settings{gap:8px}.speed-label{font-size:0}.speed-label select{font-size:10px}}@media(max-height:760px) and (min-width:761px){.panel-scroll{padding-top:20px}.panel-scroll h2{font-size:25px}.course-grid{gap:7px;margin-bottom:15px}.course-card{min-height:66px;padding:10px}.home-actions{margin:12px 0 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button em{font-size:8px;padding:2px 4px}.world-nav button.done em:after{display:none}.legend{left:19px;bottom:61px;font-size:8px;gap:12px}.world-bottom{left:18px;right:18px;bottom:17px;padding-top:13px}.view-options label{font-size:9px}.view-options{gap:13px}.scene-callout{bottom:90px;padding:10px 11px;max-width:93%}.scene-callout strong{font-size:11px;letter-spacing:0}.scene-callout small{font-size:7px}#callout-number{font-size:18px}.sidebar{width:100%;min-height:480px;border-left:0;border-top:1px solid var(--line)}.tabs{height:51px}.panel-scroll{overflow:visible;padding:23px}.panel-footer{height:38px}.panel-scroll h2{font-size:27px}.course-card{min-height:77px}.course-card strong{font-size:12px}.course-card small{font-size:9px}footer{height:auto;position:sticky;bottom:0;display:grid;grid-template-columns:1fr auto;gap:10px 12px;padding:13px 15px;box-shadow:0 -6px 30px #0b061dcc}.step-caption{min-width:0;gap:8px}.step-caption>span{font-size:12px}.step-caption strong{font-size:10px;max-width:135px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.step-caption div>span{display:none}.playback{grid-column:2;grid-row:1;gap:4px}.playback button{width:25px;height:30px}.playback .play-button{width:91px;font-size:10px}#restart{width:24px}.seek-wrap{grid-column:1;grid-row:2}.player-settings{grid-column:2;grid-row:2;justify-self:end}.speed-label select{padding:3px;font-size:9px;width:48px}.timeline button{font-size:6px}#export{font-size:8px;padding:5px 8px}.loop-label{display:flex;font-size:8px;align-items:center}.loop-label input{width:9px;height:9px;margin-right:3px}}

.music-controls{display:flex;align-items:center;position:relative;border:1px solid var(--line);border-radius:4px;background:#ffffff02}.header-actions .music-controls button{margin:0;border:0;padding:8px 10px;display:flex;gap:6px;align-items:center;min-width:69px;white-space:nowrap;color:var(--muted)}.music-controls button.playing{color:var(--gold)}.music-icon{font-size:13px}.music-controls details{border-left:1px solid var(--line)}.music-controls summary{padding:7px 7px;list-style:none;cursor:pointer;font-size:12px;color:var(--muted)}.music-controls summary::-webkit-details-marker{display:none}.music-controls summary:focus-visible{outline:2px solid var(--gold);outline-offset:3px}.music-popover{position:absolute;right:0;top:calc(100% + 12px);width:250px;padding:18px;background:#211735;border:1px solid #e8cb9949;box-shadow:0 10px 40px #05021488;z-index:30;border-radius:4px;backdrop-filter:blur(12px)}.music-popover strong{font-family:serif;font-size:20px;font-weight:400;letter-spacing:2px;color:var(--gold)}.music-popover p{font-size:9px;line-height:1.8;color:var(--muted);margin:7px 0 17px}.music-popover label{font-size:10px;color:#c3b0d2;display:flex;justify-content:space-between;align-items:center}.music-popover output{font-size:9px;color:var(--gold)}#music-volume{display:block;width:100%;height:3px;margin:16px 0 21px;accent-color:var(--gold);cursor:pointer}.music-popover .music-auto{justify-content:flex-start;gap:6px}.music-auto input{accent-color:var(--gold);width:11px;height:11px;margin:0}.music-controls:has(details[open]){border-color:#e8cb9960}@media(max-width:760px){#course-progress{display:none}header{gap:12px}.header-actions{gap:6px}.header-actions .music-controls button{min-width:60px;font-size:9px;padding:7px}.music-controls summary{padding:6px}.music-popover{width:237px;right:-25px;top:calc(100% + 15px)}.header-actions #source-shortcut{margin-left:2px}.music-icon{font-size:12px}}