:root{--ink:#f4f3ef;--muted:#a8a9af;--accent:#f0be91;--line:#ffffff18;--panel:#181b20ed;--ui:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;--mono:'SFMono-Regular',Consolas,monospace;color-scheme:dark}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#17191c;color:var(--ink);font-family:var(--ui);-webkit-font-smoothing:antialiased}button,select,input{font:inherit}button{color:inherit;background:none;border:0;cursor:pointer}button,select,a,summary{touch-action:manipulation}button:disabled{opacity:.35;cursor:default}button:hover:not(:disabled){background:#ffffff12}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible,canvas:focus-visible{outline:2px solid var(--accent);outline-offset:2px}a{color:inherit;text-decoration:none}[hidden]{display:none!important}#app{position:relative;width:100%;height:100dvh}#stage{position:absolute;inset:0}#stage canvas{display:block;width:100%;height:100%;touch-action:none;cursor:grab}#stage canvas.dragging{cursor:grabbing}#app:after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(#12141840,transparent 22%,transparent 78%,#12141830)}
.header{position:absolute;z-index:5;top:16px;left:20px;right:20px;height:60px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 14px;border:1px solid var(--line);border-radius:14px;background:var(--panel);backdrop-filter:blur(20px)}.identity{display:flex;align-items:center;gap:9px}.mark{width:28px;height:32px;fill:var(--accent)}.identity-type{display:flex;flex-direction:column;gap:5px}.identity-type strong{font-size:22px;letter-spacing:-1px;line-height:1}.brand-dot{color:var(--accent)}.identity-type>span{font:8px var(--mono);letter-spacing:1.5px;color:var(--muted)}.header-actions{display:flex;align-items:center;gap:6px}.mode-switch{display:flex;gap:2px;padding:3px;border:1px solid var(--line);border-radius:10px;background:#101216}.mode-switch button{height:44px;padding:0 22px;border-radius:7px;font-size:12px;color:var(--muted)}.mode-switch button.selected{background:#f1eee8;color:#202126}.quiet-button{height:44px;padding:0 12px;font-size:11px;border:1px solid var(--line);border-radius:8px;white-space:nowrap}.quiet-button[aria-pressed=true]:before{content:'';display:inline-block;background:var(--accent);width:5px;height:5px;border-radius:50%;margin-right:7px}.icon-button{width:44px;height:44px;display:grid;place-items:center;flex-shrink:0;border-radius:8px;color:var(--muted);font-size:20px}.icon-button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.eyebrow{font:9px var(--mono);letter-spacing:1.2px;color:var(--muted)}.intro-copy{position:absolute;z-index:2;top:104px;left:36px;pointer-events:none;text-shadow:0 2px 18px #0008}.intro-copy h1{font-size:clamp(25px,3vw,42px);font-weight:500;letter-spacing:-1.5px;line-height:1.13;margin:12px 0}.intro-description{font-size:12px;color:#ece3d7}
.transport{position:absolute;z-index:5;left:50%;transform:translateX(-50%);width:min(780px,calc(100% - 40px));bottom:max(16px,env(safe-area-inset-bottom));padding:10px 14px;border:1px solid var(--line);border-radius:14px;background:var(--panel);backdrop-filter:blur(24px);user-select:none}.transport-top{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px}.current-step{display:flex;align-items:center;gap:10px;min-width:0}.current-step>span{display:grid;place-items:center;flex-shrink:0;width:36px;height:36px;border:1px solid #efbe9130;border-radius:8px;color:var(--accent);font:13px var(--mono)}.current-step>div{min-width:0}.current-step p{font-size:12px;line-height:1.3;margin:4px 0 0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.current-step .eyebrow{font-size:8px}.transport-tools{display:flex;gap:6px;align-items:center;flex-shrink:0}select{color:var(--ink);background:#24272d;border:1px solid var(--line);border-radius:7px;height:44px;padding:0 8px;cursor:pointer;font:11px var(--mono)}#clock{white-space:nowrap;font:10px var(--mono);color:var(--muted)}#clock b{font-weight:400;margin:0 3px}.transport-bottom{display:flex;gap:12px;align-items:center}.playback-buttons{display:flex;align-items:center;gap:2px}.skip-button{height:44px;width:44px;border-radius:8px;font-size:26px;color:var(--muted)}.play-button{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:#29221d;flex-shrink:0}.play-button:hover:not(:disabled){background:#ffcea2}.play-button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.progress-wrap{position:relative;flex:1;min-width:0}input[type=range]{appearance:none;display:block;position:relative;z-index:2;width:100%;height:44px;margin:0;background:transparent;cursor:pointer}input[type=range]::-webkit-slider-runnable-track{height:3px;background:linear-gradient(to right,var(--accent) var(--progress,0%),#ffffff24 var(--progress,0%));border-radius:4px}input[type=range]::-webkit-slider-thumb{appearance:none;width:13px;height:13px;margin-top:-5px;border-radius:50%;background:#f8d0ad}input[type=range]::-moz-range-track{height:3px;background:#ffffff24}input[type=range]::-moz-range-progress{height:3px;background:var(--accent)}input[type=range]::-moz-range-thumb{width:13px;height:13px;border:0;border-radius:50%;background:var(--accent)}.progress-segments{position:absolute;top:18px;width:100%;height:9px;pointer-events:none}.progress-segments span{position:absolute;width:1px;height:9px;background:#ffffff28}.chapter-labels{display:none}.footer-line{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);margin-top:6px;font-size:10px;color:var(--muted);gap:8px}.view-tools{display:flex;gap:2px}.view-tools button{height:44px;min-width:44px;padding:0 10px;font-size:11px;border-radius:6px}.view-tools button:last-child{color:var(--accent)}
.teaching-panel,.about-panel{position:absolute;z-index:10;right:20px;top:92px;bottom:16px;width:300px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--panel);backdrop-filter:blur(24px)}.teaching-panel{display:flex;flex-direction:column;overflow:hidden}.panel-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:4px}.chapter-heading{display:flex;justify-content:space-between;align-items:center;gap:8px;font:10px var(--mono);color:var(--accent);margin-bottom:10px}.status-pill{font:10px var(--ui);color:#d4d6dc;border:1px solid var(--line);border-radius:20px;padding:4px 8px}.status-pill.complete{color:#a9dfce;border-color:#a9dfce80}.teaching-panel h2,.about-panel h2{font-size:22px;letter-spacing:-.5px;line-height:1.2;font-weight:550;margin:0 0 12px}.lesson-meta{font:10px var(--mono);color:var(--muted);margin-bottom:8px}.lesson-meter{height:3px;flex-shrink:0;background:#ffffff18;border-radius:4px;overflow:hidden;margin-bottom:12px}.lesson-meter i{display:block;height:100%;background:var(--accent)}.step-buttons{display:flex;gap:6px}.step-buttons button{flex:1;height:44px;border:1px solid var(--line);border-radius:8px;font-size:12px}.step-buttons #next{background:#efbe9115;color:var(--accent);border-color:#efbe9130}.step-buttons #replay{flex:0 0 48px;background:var(--accent);color:#24201c;font-size:20px}.lesson-options{display:flex;align-items:center;justify-content:flex-end;margin:6px 0}.lesson-options button{height:44px;padding:0 10px;border-radius:7px;font-size:11px;color:var(--muted)}.lesson-options button span{color:var(--accent);margin-left:5px}summary{cursor:pointer;list-style:none;min-height:44px;display:flex;align-items:center;font-size:11px}summary::-webkit-details-marker{display:none}summary:before{content:'›';font-size:17px;margin-right:8px}details[open]>summary:before{transform:rotate(90deg)}#lesson-help{order:6;border-top:1px solid var(--line);flex-shrink:0}#lesson-help p{font-size:12px;line-height:1.6;color:var(--muted);margin:0 0 8px}#lesson-ref{font:10px var(--mono);color:var(--muted)}#step-list{min-height:0;flex:1;overflow:auto;border-top:1px solid var(--line);scrollbar-width:thin}#step-list summary{position:sticky;top:0;background:#1b1e23;z-index:1}#step-count{margin-left:auto;font:10px var(--mono);color:var(--muted)}.step-library{padding:0 0 6px}#step-search{width:100%;height:44px;background:#0e101480;color:var(--ink);border:1px solid var(--line);border-radius:7px;padding:0 10px;font-size:12px;margin-bottom:8px}.step-group h3{font:9px var(--mono);text-transform:uppercase;letter-spacing:1px;color:#a0a5ae;margin:15px 0 7px}.steps button{display:flex;width:100%;min-height:58px;align-items:center;text-align:left;gap:8px;padding:6px;border:1px solid transparent;border-radius:8px;font-size:11px;line-height:1.4;color:#c5c8d0;margin:3px 0}.steps button>span{min-width:18px;font:10px var(--mono);color:#a0a5ae}.steps button small{margin-left:auto;white-space:nowrap;font:9px var(--mono);color:#a0a5ae}.steps button.active{background:#efbe9114;border-color:#efbe9160;color:var(--accent)}.step-thumbnail{width:52px;height:44px;flex-shrink:0;background:#353832;border-radius:5px}#no-steps{font-size:12px;color:var(--muted)}
.teaching-active .transport{left:calc((100% - 330px)/2);width:min(780px,calc(100% - 370px));display:flex;justify-content:space-between;align-items:center;gap:6px;padding:6px 10px}.teaching-active .transport-top{margin:0}.teaching-active .current-step,.teaching-active #clock,.teaching-active .transport-bottom,.teaching-active #view-hint{display:none}.teaching-active .footer-line{border:0;margin:0}.resume{height:44px;border-radius:8px;background:var(--accent);color:#24201c;display:flex;align-items:center;justify-content:center;gap:8px;padding:0 12px;font-size:12px}.transport:has(.resume:not([hidden])){flex-wrap:wrap}.transport:has(.resume:not([hidden])) .resume{flex:1}body:not(.teaching-active) .transport .resume{width:100%;margin-top:6px}
.about-panel{width:350px;overflow:auto}.about-panel>p,.status-note p{font-size:12px;line-height:1.6;color:var(--muted)}.about-panel dl{margin:20px 0;font-size:11px}.about-panel dl>div{display:flex;justify-content:space-between;gap:10px;padding:12px 0;border-bottom:1px solid var(--line)}dt{color:var(--muted)}dd{margin:0}.swatch{display:inline-block;width:8px;height:8px;border-radius:50%;margin-left:5px}.red{background:#b62620}.ivory{background:#f1e6cb}.status-note{border:1px solid #efbe9122;background:#efbe9108;border-radius:9px;padding:12px;margin-bottom:16px;font-size:12px}.debug-options{display:grid;grid-template-columns:1fr 1fr;gap:6px}.debug-options button{border:1px solid var(--line);border-radius:6px;min-height:44px;padding:8px;font-size:11px}.debug-options button[aria-pressed=true]{color:var(--accent);border-color:#efbe9160}#debug-stats{font:10px/1.7 var(--mono);white-space:pre-wrap;color:var(--muted)}.keyboard{display:grid;gap:8px;margin-top:18px;border-top:1px solid var(--line);padding-top:16px;font-size:11px;color:var(--muted)}kbd{padding:2px 5px;border:1px solid #ffffff30;border-radius:4px;font:10px var(--mono);margin-right:4px}#hands-toggle{margin-bottom:16px}
#fold-guides{position:absolute;inset:0;width:100%;height:100%;z-index:2;pointer-events:none;overflow:hidden}#motion-trail{fill:none;stroke:#244c48;stroke-width:3;stroke-dasharray:7 6;filter:drop-shadow(0 1px 1px #fff9)}#fold-arrow path{fill:none;stroke:#244c48;stroke-width:2}.grip{position:absolute;z-index:3;display:grid;place-items:center;width:44px;height:44px;transform:translate(-50%,-50%);border-radius:50%;background:#181b2040;touch-action:none}.grip i{width:28px;height:28px;border:2px solid #fff;border-radius:50%;box-shadow:0 0 0 4px #0003}.grip i:after{content:'';display:block;width:6px;height:6px;margin:9px;background:var(--accent);border-radius:50%}#toast{position:absolute;z-index:20;left:50%;top:90px;transform:translateX(-50%);opacity:0;pointer-events:none;max-width:90%;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:12px 18px;font-size:12px;line-height:1.5}#toast.show{opacity:1}#loading{position:absolute;inset:0;z-index:4;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:20px;background:#17191c}#loading p{font-size:12px;color:var(--muted);max-width:340px;line-height:1.7;text-align:center}.loading-paper{width:28px;height:28px;border:1px solid var(--accent);transform:rotate(45deg)}.loading-paper:after{content:'';display:block;width:100%;height:100%;clip-path:polygon(0 0,100% 0,0 100%);background:var(--accent)}
@media(max-width:700px){.header{top:8px;left:10px;right:10px;height:56px;padding:0 8px;gap:4px}.identity{gap:5px}.mark{width:20px}.identity-type strong{font-size:17px}.identity-type>span{display:none}.mode-switch button{padding:0 12px;font-size:11px}#quality{display:none}.intro-copy{top:85px;left:24px}.intro-copy .eyebrow{display:none}.transport{width:calc(100% - 20px);bottom:max(8px,env(safe-area-inset-bottom));padding:6px 8px}.current-step>span{display:none}.current-step p{font-size:11px;white-space:normal}.current-step .eyebrow{display:none}#clock{display:none}.transport-top{gap:4px;margin:0}.transport-tools{gap:2px}.footer-line{margin:0;justify-content:flex-end}#view-hint{display:none}.transport-bottom{gap:8px}.view-tools button{padding:0 8px}.teaching-active .transport{left:50%;width:calc(100% - 20px);padding:4px 6px}.teaching-panel{left:10px;right:10px;top:auto;bottom:calc(var(--dock-height,56px) + 18px);width:auto;padding:10px 12px;overflow:visible;display:grid;grid-template-columns:1fr auto;gap:0 8px}.teaching-panel .panel-heading,.chapter-heading #chapter-name,.lesson-meta,.lesson-meter,#lesson-help{display:none}.chapter-heading{grid-column:2;grid-row:1;margin:0}.teaching-panel h2{font-size:16px;grid-row:1;grid-column:1;margin:0;align-self:center}.step-buttons{grid-row:2;grid-column:1/3;margin-top:10px}.lesson-options{grid-row:3;grid-column:1;margin:0;justify-content:flex-start}#step-list{grid-row:3;grid-column:2;overflow:visible;border:0}#step-list summary{position:static;background:none;gap:6px}#step-list[open] .step-library{position:absolute;z-index:11;right:0;bottom:44px;width:calc(100vw - 20px);max-height:min(50dvh,420px);overflow:auto;padding:12px;background:#1b1e23;border:1px solid #ffffff30;border-radius:12px;box-shadow:0 8px 50px #0008}.about-panel{top:72px;bottom:8px;left:10px;right:10px;width:auto}.status-pill{font-size:9px}.resume{padding:0 8px}#toast{top:74px}}
@media(max-height:500px) and (min-width:701px){.header{top:8px;height:54px}.identity-type>span{display:none}.teaching-panel{top:72px;bottom:8px;width:260px;right:10px;padding:10px}.panel-heading,.chapter-heading #chapter-name,#lesson-help{display:none}.chapter-heading{position:absolute;right:10px;top:10px}.teaching-panel h2{font-size:16px;max-width:175px;margin:0 0 8px}.lesson-meta{font-size:9px}.lesson-meter{margin-bottom:8px}.lesson-options{margin:0}.teaching-active .transport{left:calc((100% - 280px)/2);width:calc(100% - 310px);bottom:8px}.transport{bottom:8px;padding:4px 10px}.transport-top .current-step{display:none}.transport-top{position:absolute;right:10px;top:4px}.transport-bottom{padding-right:115px}.transport-tools #clock{display:none}.footer-line{border:0;margin:0}.teaching-active .transport-top{position:static}.intro-copy{top:78px}.about-panel{top:72px;bottom:8px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}

@media(max-width:700px){.teaching-panel{grid-template-columns:1fr 44px auto}.chapter-heading{grid-column:3}.teaching-panel h2{grid-column:1/3}.step-buttons{grid-column:1/4}#step-list{grid-column:3}#lesson-help{display:block;grid-row:3;grid-column:2;border:0}#lesson-help summary{font-size:0;justify-content:center}#lesson-help summary:before{content:'?';font-size:16px;transform:none;margin:0}#lesson-help[open]{position:relative}#lesson-help[open] p,#lesson-help[open] #lesson-ref{position:fixed;left:10px;right:10px;bottom:calc(var(--dock-height,56px) + 176px);padding:16px;background:#1b1e23;border:1px solid #ffffff30;border-radius:12px;box-shadow:0 8px 50px #0008;z-index:12}#lesson-help[open] #lesson-ref{display:none}}