:root{--bg:#000;--bg-card:#0a0a0a;--bg-card-hover:#111;--surface:#0f0f0f;--text:#d4d4d4;--text-dim:#555;--accent:#00ffd5;--accent-light:#33ffe0;--accent-dark:#0ca;--success:#0f8;--error:#f35;--warning:#fa0;--border:#1a1a1a;--radius:2px;--radius-sm:1px;--font-mono:"JetBrains Mono", "Fira Code", "Cascadia Code", monospace}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-mono);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;line-height:1.6}#root{min-height:100vh}code{background:var(--surface);border-radius:var(--radius);color:var(--accent);font-size:13px;font-family:var(--font-mono);padding:2px 6px}::selection{background:var(--accent);color:#000}.btn{border:1px solid var(--border);border-radius:var(--radius);cursor:pointer;font-size:13px;font-weight:500;font-family:var(--font-mono);text-transform:lowercase;letter-spacing:.5px;color:var(--text);background:0 0;align-items:center;gap:6px;padding:8px 16px;transition:all .1s;display:inline-flex}.btn:hover,.btn-primary{border-color:var(--accent);color:var(--accent)}.btn-primary:hover{background:var(--accent);color:#000}.btn-primary.active{background:var(--error);border-color:var(--error);color:#000}.btn-accent{border-color:var(--success);color:var(--success)}.btn-accent:hover{background:var(--success);color:#000}.btn-secondary{border-color:var(--border);color:var(--text)}.btn-secondary:hover{border-color:var(--accent);color:var(--accent)}.btn-secondary.active{background:var(--error);border-color:var(--error);color:#000}.btn-ghost{color:var(--text-dim);background:0 0;border:1px solid #0000}.btn-ghost:hover{color:var(--accent);border-color:#0000}.level-select{max-width:960px;margin:0 auto;padding:48px 24px}.level-select-header{text-align:left;margin-bottom:56px;padding-left:4px}.logo{letter-spacing:-3px;font-size:56px;font-weight:700;font-family:var(--font-mono);margin-bottom:4px}.logo-algo{color:var(--text)}.logo-rythm{color:var(--accent)}.tagline{color:var(--text-dim);font-size:14px;font-family:var(--font-mono)}.tagline-link{color:var(--accent);text-underline-offset:2px;text-decoration:underline}.chapters{flex-direction:column;gap:40px;display:flex}.chapter-card{border:none;border-top:1px solid var(--border);background:0 0;border-radius:0;padding:24px 0}.chapter-header{margin-bottom:16px}.chapter-header h2{font-size:16px;font-weight:500;font-family:var(--font-mono);align-items:baseline;gap:10px;display:flex}.chapter-number{color:var(--accent);text-transform:uppercase;letter-spacing:2px;font-size:11px;font-weight:400}.chapter-desc{color:var(--text-dim);margin-top:2px;font-size:12px}.chapter-progress{color:var(--accent);background:0 0;border-radius:0;margin-top:6px;padding:0;font-size:11px;display:inline-block}.level-grid{background:var(--border);border:1px solid var(--border);grid-template-columns:repeat(5,1fr);gap:1px;display:grid}.level-card{background:var(--bg);cursor:pointer;font-family:var(--font-mono);color:var(--text-dim);border:none;border-radius:0;flex-direction:column;align-items:flex-start;gap:4px;padding:14px;transition:all .1s;display:flex}.level-card:hover{background:var(--bg-card-hover);color:var(--accent)}.level-card.level-done{border-left:2px solid var(--success)}.level-card.level-done .level-title{color:var(--text)}.level-icon{opacity:.6;font-size:16px}.level-num{color:var(--text-dim);text-transform:uppercase;letter-spacing:1px;font-size:10px;font-weight:400}.level-title{text-align:left;font-size:12px;font-weight:400}.level-score{color:var(--success);font-size:10px;font-weight:400}.puzzle-view{flex-direction:column;height:100vh;display:flex}.puzzle-header{background:var(--bg);border-bottom:1px solid var(--border);flex-shrink:0;align-items:center;gap:16px;padding:8px 16px;display:flex}.puzzle-title-area{align-items:center;gap:10px;display:flex}.puzzle-title-area h2{font-size:14px;font-weight:500;font-family:var(--font-mono)}.puzzle-type-badge{text-transform:uppercase;letter-spacing:1.5px;color:var(--accent);border:1px solid var(--accent);border-radius:var(--radius);white-space:nowrap;opacity:.7;background:0 0;padding:2px 8px;font-size:10px;font-weight:400}.puzzle-body{flex:1;display:flex;overflow:hidden}.puzzle-instructions{border-right:1px solid var(--border);background:var(--bg);flex-direction:column;gap:16px;width:320px;min-width:280px;padding:20px;display:flex;overflow-y:auto}.puzzle-description{color:var(--text-dim);font-size:13px;line-height:1.8}.puzzle-description code{color:var(--accent)}.puzzle-description a{color:var(--accent);text-underline-offset:2px;text-decoration:underline}.target-controls{gap:8px;display:flex}.hints-area{flex-direction:column;gap:6px;display:flex}.hint{border:1px solid #fa03;border-left:2px solid var(--warning);color:var(--warning);background:0 0;border-radius:0;padding:8px 12px;font-size:12px}.hint-btn{font-size:12px}.result-card{border-radius:var(--radius);padding:14px;animation:.2s slideUp}@keyframes slideUp{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.result-pass{border:1px solid var(--success);border-left:3px solid var(--success);background:0 0}.result-fail{border:1px solid var(--error);border-left:3px solid var(--error);background:0 0}.result-feedback{font-size:13px;font-weight:500}.result-pass .result-feedback{color:var(--success)}.result-fail .result-feedback{color:var(--error)}.result-score{color:var(--success);opacity:.8;margin-top:4px;font-size:12px}.result-actions{margin-top:10px}.puzzle-editor-area{background:var(--bg);flex-direction:column;flex:1;display:flex;overflow:hidden}.editor-container{flex:1;overflow:hidden}.editor-container .cm-editor{height:100%}.cm-strudel-active{background:#00ffd540;border-radius:2px;outline:1px solid #00ffd566;box-shadow:0 0 4px #00ffd580,inset 0 0 2px #00ffd54d}.cm-inline-viz{width:100%;padding:2px 0}.cm-inline-viz-canvas{border-radius:3px;width:100%;height:60px;display:block}.editor-controls{background:var(--bg);border-top:1px solid var(--border);flex-wrap:wrap;flex-shrink:0;align-items:center;gap:8px;padding:8px 16px;display:flex}.editor-hint{color:var(--text-dim);opacity:.5;margin-left:auto;font-size:11px}.editor-hint kbd{font-size:10px;font-family:var(--font-mono);color:var(--text-dim);border:1px solid var(--border);border-radius:var(--radius);background:0 0;padding:1px 4px;display:inline-block}.jam-btn{margin-top:16px}.sandbox-view{flex-direction:column;height:100vh;display:flex}.sandbox-slots{gap:4px;display:flex}.sandbox-header-right{align-items:center;gap:12px;margin-left:auto;display:flex}.sample-picker{font-family:var(--font-mono);background:var(--bg);color:var(--text-dim);border:1px solid var(--border);cursor:pointer;outline:none;padding:4px 8px;font-size:11px}.sample-picker:hover,.sample-picker:focus{color:var(--accent);border-color:var(--accent)}.slot-btn{opacity:.5;padding:4px 10px;font-size:11px}.slot-btn.slot-active{opacity:1;color:var(--accent);border-color:var(--accent)}.sandbox-editor-area{background:var(--bg);flex-direction:column;flex:1;display:flex;overflow:hidden}.sandbox-error{color:var(--error);border-top:1px solid var(--error);background:#ff335514;padding:6px 16px;font-size:12px}.visualizer-panel{border-top:1px solid var(--border);background:#000;flex-shrink:0;height:140px}.visualizer-canvas{width:100%;height:100%;display:block}.viz-toggle{padding:4px 10px;font-size:11px}.piano-panel{border-top:1px solid var(--border);background:#000;flex-shrink:0;padding:8px 0 0}.piano-expression-row{align-items:center;gap:6px;padding:0 12px 6px;display:flex}.piano-expression{font-family:var(--font-mono);background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);outline:none;flex:1;padding:4px 8px;font-size:11px}.piano-expression:focus{border-color:var(--accent)}.piano-reset-btn{padding:2px 8px;font-size:10px}.piano-error{color:var(--error);padding:0 12px 4px;font-size:11px}.piano-octave-row{justify-content:center;align-items:center;gap:8px;padding:0 12px 4px;display:flex}.piano-octave-btn{min-width:28px;padding:1px 8px;font-size:11px}.piano-octave-btn:disabled{opacity:.25;cursor:default}.piano-octave-label{font-family:var(--font-mono);color:var(--text-dim);letter-spacing:.5px;font-size:10px}.piano-keys{-webkit-overflow-scrolling:touch;touch-action:none;-webkit-user-select:none;user-select:none;--piano-white-w:40px;--piano-black-w:28px;height:90px;display:flex;position:relative;overflow-x:auto}.piano-key{cursor:pointer;justify-content:center;align-items:flex-end;transition:background 50ms,box-shadow 50ms;display:flex}.piano-key-white{width:var(--piano-white-w);min-width:var(--piano-white-w);z-index:1;background:#181818;border-bottom:1px solid #000;border-right:1px solid #000;height:100%}.piano-key-white:hover{background:#222}.piano-key-white.piano-key-c{border-left:1px solid var(--accent)}.piano-key-black{width:var(--piano-black-w);z-index:2;background:#000;border:1px solid #222;border-top:none;border-radius:0 0 3px 3px;height:55%;position:absolute;top:0}.piano-key-black:hover{background:#111}.piano-key-active.piano-key-white{background:var(--accent);box-shadow:0 0 12px #00ffd580,inset 0 0 4px #00ffd54d}.piano-key-active.piano-key-white .piano-key-label{color:#000}.piano-key-active.piano-key-black{background:var(--accent);border-color:var(--accent);box-shadow:0 0 12px #00ffd580}.piano-key-active.piano-key-black .piano-key-label{color:#000}.piano-key-label{font-family:var(--font-mono);color:var(--text-dim);pointer-events:none;white-space:nowrap;padding-bottom:4px;font-size:9px}.piano-key-black .piano-key-label{color:#555;padding-bottom:3px;font-size:8px}.drum-panel{border-top:1px solid var(--border);background:#000;flex-shrink:0;padding:8px 12px}.drum-expression-row{align-items:center;gap:6px;padding-bottom:6px;display:flex}.drum-expression{font-family:var(--font-mono);background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:var(--radius);outline:none;flex:1;padding:4px 8px;font-size:11px}.drum-expression:focus{border-color:var(--accent)}.drum-reset-btn{padding:2px 8px;font-size:10px}.drum-error{color:var(--error);padding-bottom:4px;font-size:11px}.drum-pads-grid{touch-action:none;-webkit-user-select:none;user-select:none;grid-template-columns:repeat(5,1fr);gap:4px;display:grid}.drum-pad{border-radius:var(--radius);cursor:pointer;background:#111;border:1px solid #222;flex-direction:column;justify-content:center;align-items:center;gap:2px;padding:10px 4px;transition:background 50ms,box-shadow 50ms;display:flex}.drum-pad:hover{background:#1a1a1a;border-color:#333}.drum-pad-active{box-shadow:0 0 12px #00ffd580;background:var(--accent)!important;border-color:var(--accent)!important}.drum-pad-active .drum-pad-label,.drum-pad-active .drum-pad-desc{color:#000}.drum-pad-label{font-family:var(--font-mono);color:var(--text);pointer-events:none;font-size:13px;font-weight:500}.drum-pad-desc{font-family:var(--font-mono);color:var(--text-dim);pointer-events:none;font-size:9px}.drum-pad-unavailable{opacity:.2;cursor:default}.drum-pad-unavailable:hover{background:#111;border-color:#222}.share-controls{gap:4px;margin-left:auto;display:flex}.share-controls .btn{padding:4px 10px;font-size:11px}.toast{background:var(--accent);color:var(--bg);font-family:var(--font-mono);z-index:100;padding:8px 20px;font-size:12px;animation:.2s ease-out toast-in;position:fixed;bottom:24px;left:50%;transform:translate(-50%)}@keyframes toast-in{0%{opacity:0;transform:translate(-50%)translateY(8px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.viz-toggle.viz-active{color:var(--accent);border-color:var(--accent)}.about-section{border-top:1px solid var(--border);max-width:480px;margin-top:64px;padding-top:24px}.about-section h3{color:var(--text-dim);font-size:12px;font-weight:400;font-family:var(--font-mono);margin-bottom:12px}.about-section p{color:var(--text-dim);margin-bottom:10px;font-size:12px;line-height:1.7}.about-section a{color:var(--accent);text-underline-offset:2px;text-decoration:underline}@media (width<=768px){.puzzle-body{flex-direction:column}.puzzle-instructions{width:100%;min-width:unset;border-right:none;border-bottom:1px solid var(--border);max-height:40vh}.level-grid{grid-template-columns:repeat(3,1fr)}.logo{font-size:36px}.piano-key-white{width:34px;min-width:34px}.piano-key-black{width:24px}.piano-keys{--piano-white-w:34px;--piano-black-w:24px}.piano-key-label{font-size:8px}.piano-key-black .piano-key-label{font-size:7px}}