:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-elevated: #334155;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #6366f1;--accent-light: #818cf8;--accent-glow: rgba(99, 102, 241, .2);--success: #10b981;--warning: #f59e0b;--error: #ef4444;--border: #334155;--radius: 12px;--radius-sm: 8px;--radius-xs: 4px;--transition: .2s ease;--font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;background:var(--bg-primary);color:var(--text-primary);font-family:var(--font);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#root{min-height:100%}.app{min-height:100vh;display:flex;flex-direction:column}.player-container{flex:1;display:flex;flex-direction:column;max-width:1200px;margin:0 auto;padding:20px 24px;width:100%}.player-header{display:flex;align-items:center;justify-content:space-between;padding:8px 0 16px}.player-header-left{display:flex;align-items:center;gap:12px}.player-logo{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--text-primary);cursor:pointer;background:none;border:none;font:inherit}.player-logo svg{flex-shrink:0}.player-logo-text{font-size:16px;font-weight:600;letter-spacing:-.02em}.player-topic-badge{font-size:13px;color:var(--text-secondary);background:var(--bg-secondary);padding:4px 12px;border-radius:20px;border:1px solid var(--border)}.canvas-wrapper{position:relative;background:var(--bg-secondary);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;aspect-ratio:16 / 9;width:100%}.canvas-wrapper svg{display:block;width:100%;height:100%}.canvas-transition-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:var(--bg-primary);pointer-events:none;transition:opacity .4s ease}.player-controls{padding:12px 0 4px}.progress-bar{position:relative;height:20px;cursor:pointer;display:flex;align-items:center;padding:6px 0}.progress-track{position:relative;width:100%;height:4px;background:var(--bg-elevated);border-radius:2px;overflow:visible}.progress-bar:hover .progress-track{height:6px}.progress-fill{height:100%;background:var(--accent);border-radius:2px;transition:width 50ms linear}.progress-thumb{position:absolute;top:50%;width:14px;height:14px;background:var(--accent-light);border:2px solid var(--bg-primary);border-radius:50%;transform:translate(-50%,-50%);opacity:0;transition:opacity var(--transition);pointer-events:none}.progress-bar:hover .progress-thumb{opacity:1}.controls-row{display:flex;align-items:center;justify-content:space-between;padding:6px 0;gap:12px}.controls-left,.controls-center,.controls-right{display:flex;align-items:center;gap:10px}.controls-center{flex:1;justify-content:center;min-width:0}.control-btn{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;border-radius:50%;background:transparent;color:var(--text-primary);cursor:pointer;transition:background var(--transition)}.control-btn:hover{background:var(--bg-elevated)}.play-btn{width:42px;height:42px;background:var(--accent);color:#fff}.play-btn:hover{background:var(--accent-light)}.time-display{font-size:13px;color:var(--text-secondary);font-variant-numeric:tabular-nums;white-space:nowrap}.node-title{font-size:13px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.step-indicator{display:flex;gap:5px;align-items:center}.step-dot{width:8px;height:8px;border-radius:50%;background:var(--bg-elevated);border:1.5px solid var(--text-muted);transition:all var(--transition)}.step-dot.active{background:var(--accent);border-color:var(--accent);transform:scale(1.3)}.step-dot.completed{background:var(--success);border-color:var(--success)}.narration-panel{padding:14px 18px;margin-top:8px;background:var(--bg-secondary);border-radius:var(--radius-sm);border:1px solid var(--border);border-left:3px solid var(--border);transition:border-color var(--transition);min-height:60px}.narration-panel.active{border-left-color:var(--accent)}.narration-header{display:flex;align-items:center;gap:8px;margin-bottom:6px}.narration-indicator{width:6px;height:6px;border-radius:50%;background:var(--text-muted)}.narration-panel.active .narration-indicator{background:var(--accent);animation:pulse-dot 2s ease infinite}@keyframes pulse-dot{0%,to{opacity:1}50%{opacity:.4}}.narration-node-title{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.narration-text{font-size:15px;line-height:1.6;color:var(--text-primary)}.topic-input-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.topic-input-hero{max-width:640px;width:100%;display:flex;flex-direction:column;align-items:center;gap:24px}.logo{display:flex;align-items:center;gap:14px}.logo-text{font-size:28px;font-weight:700;letter-spacing:-.03em;background:linear-gradient(135deg,var(--accent-light),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-subtitle{font-size:18px;color:var(--text-secondary);text-align:center;margin-top:-8px}.hero-subtitle em{color:var(--accent-light);font-style:normal;font-weight:500}.topic-form{width:100%}.topic-input-wrapper{display:flex;align-items:center;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:6px 8px 6px 16px;transition:border-color var(--transition),box-shadow var(--transition);gap:8px}.topic-input-wrapper:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow)}.topic-input-icon{flex-shrink:0;color:var(--text-muted)}.topic-input{flex:1;background:transparent;border:none;outline:none;font-size:16px;color:var(--text-primary);font-family:var(--font);padding:8px 0}.topic-input::placeholder{color:var(--text-muted)}.topic-submit-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border:none;border-radius:var(--radius-sm);background:var(--accent);color:#fff;cursor:pointer;transition:background var(--transition);flex-shrink:0}.topic-submit-btn:hover:not(:disabled){background:var(--accent-light)}.topic-submit-btn:disabled{opacity:.4;cursor:not-allowed}.topic-suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;align-items:center}.suggestions-label{font-size:13px;color:var(--text-muted)}.suggestion-chip{font-size:13px;padding:5px 12px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:20px;color:var(--text-secondary);cursor:pointer;font-family:var(--font);transition:all var(--transition)}.suggestion-chip:hover:not(:disabled){border-color:var(--accent);color:var(--accent-light);background:#6366f114}.suggestion-chip:disabled{opacity:.4;cursor:not-allowed}.demo-btn{display:flex;align-items:center;gap:8px;padding:10px 20px;background:transparent;border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:14px;font-family:var(--font);cursor:pointer;transition:all var(--transition);margin-top:8px}.demo-btn:hover:not(:disabled){border-color:var(--accent);color:var(--accent-light)}.demo-btn:disabled{opacity:.4;cursor:not-allowed}.spinner{width:18px;height:18px;border:2px solid transparent;border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px}.loading-spinner{width:40px;height:40px;border:3px solid var(--bg-elevated);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}.loading-text{font-size:15px;color:var(--text-secondary)}.error-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:24px}.error-icon{width:48px;height:48px;border-radius:50%;background:#ef44441a;display:flex;align-items:center;justify-content:center;color:var(--error);font-size:24px}.error-title{font-size:18px;font-weight:600}.error-message{font-size:14px;color:var(--text-secondary);text-align:center;max-width:400px}.error-btn{padding:8px 20px;background:var(--accent);border:none;border-radius:var(--radius-sm);color:#fff;font-size:14px;font-family:var(--font);cursor:pointer;transition:background var(--transition);margin-top:8px}.error-btn:hover{background:var(--accent-light)}.debug-panel{margin-top:12px;padding:12px 16px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:12px;color:var(--text-muted);font-variant-numeric:tabular-nums}.debug-panel-title{font-weight:600;color:var(--text-secondary);margin-bottom:6px;font-size:11px;text-transform:uppercase;letter-spacing:.05em}.debug-row{display:flex;justify-content:space-between;padding:2px 0}.debug-label{color:var(--text-muted)}.debug-value{color:var(--text-secondary)}@media (max-width: 768px){.player-container{padding:12px 16px}.player-header{flex-direction:column;align-items:flex-start;gap:8px}.controls-center{display:none}.topic-input-hero{gap:20px}.logo-text{font-size:22px}.hero-subtitle{font-size:15px}.topic-suggestions{gap:6px}.suggestion-chip{font-size:12px;padding:4px 10px}}