:root{--bg-color: #0f172a;--panel-bg: #1e293b;--text-primary: #f8fafc;--text-secondary: #94a3b8;--accent-color: #38bdf8;--border-color: #334155;--canvas-bg: #020617}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background-color:var(--bg-color);color:var(--text-primary);display:flex;justify-content:center;align-items:center;min-height:100vh;padding:1rem}#app{display:flex;flex-direction:column;align-items:center;gap:.75rem;max-width:900px;width:100%}.app-header{text-align:center;width:100%;max-width:820px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:.5rem}.header-main{text-align:left}.app-header h1{font-size:1.5rem;letter-spacing:.05em;color:var(--text-primary)}.app-header 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h2{font-size:1.25rem;color:#38bdf8;margin:0}.badge-paused{background-color:#f59e0b33;color:#fbbf24;border:1px solid #f59e0b;font-size:.75rem;padding:.15rem .5rem;border-radius:9999px}.preset-group{display:flex;align-items:center;gap:.5rem;margin:.75rem 0;flex-wrap:wrap}.preset-label{font-size:.8rem;color:var(--text-secondary)}.btn-preset{background-color:var(--panel-bg);border:1px solid var(--border-color);color:var(--text-secondary);font-size:.75rem;padding:.3rem .6rem;border-radius:4px;cursor:pointer;margin-top:0;transition:all .15s}.btn-preset:hover,.btn-preset:focus-visible{background-color:#334155;color:#f8fafc;border-color:var(--accent-color)}.editor-toolbar{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.4rem}.btn-editor-tool{background-color:var(--panel-bg);border:1px solid var(--border-color);color:var(--text-secondary);font-size:.8rem;padding:.3rem .7rem;border-radius:4px;cursor:pointer;margin-top:0;white-space:nowrap;transition:all .15s}.btn-editor-tool:hover,.btn-editor-tool:focus-visible{background-color:#334155;color:#f8fafc;border-color:var(--accent-color)}@media(pointer:coarse){.btn-editor-tool{min-height:44px;min-width:44px;font-size:.9rem}}.editor-container{margin:.5rem 0}.code-textarea{width:100%;box-sizing:border-box;background-color:#050b14;color:#38bdf8;font-family:Consolas,Monaco,Courier New,Courier,monospace;font-size:.85rem;line-height:1.4;padding:.75rem;border-radius:6px;border:1px solid #334155;resize:vertical;min-height:180px;tab-size:4}.editor-hint{margin-top:.35rem;font-size:.72rem;color:var(--text-secondary)}.code-textarea:focus{outline:2px solid var(--accent-color);border-color:transparent}.error-banner{background-color:#ef444426;border:1px solid #ef4444;border-radius:6px;padding:.6rem .75rem;margin:.5rem 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#3b82f6;color:#93c5fd;font-size:.75rem;padding:.2rem .5rem;border-radius:4px;cursor:pointer;transition:all .15s}.chip-tag:hover{background-color:#2563eb;color:#fff}.chip-learning-goal{font-size:.75rem;color:#38bdf8;background-color:#38bdf81a;padding:.2rem .4rem;border-radius:3px;margin-top:.25rem;display:block}.chip-code-preview{font-family:Consolas,Monaco,Courier New,Courier,monospace;font-size:.7rem;color:#a7f3d0;background-color:#050b14;padding:.3rem .5rem;border-radius:3px;margin-top:.3rem;white-space:pre-wrap;display:block}@media(orientation:landscape)and (max-height:500px){body{padding:0;min-height:0;height:100dvh;align-items:stretch}#app{height:100dvh;max-width:none;gap:.25rem;padding:0 env(safe-area-inset-right) 0 env(safe-area-inset-left)}.app-header{max-width:none;flex-wrap:nowrap;gap:.5rem;padding:.15rem .5rem 0}.app-header h1{font-size:.95rem}.app-header .subtitle{display:none}.header-actions{flex-wrap:nowrap}.header-btn{font-size:.75rem;padding:.2rem 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