:root{--primary: #667eea;--primary-dark: #5568d3;--primary-light: #7c8ef0;--secondary: #764ba2;--accent: #f59e0b;--success: #22c55e;--warning: #f59e0b;--error: #ef4444;--info: #3b82f6;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-750: #2d3748;--gray-800: #1f2937;--gray-900: #111827;--spacing-xs: 4px;--spacing-sm: 8px;--spacing-md: 16px;--spacing-lg: 24px;--spacing-xl: 32px;--spacing-2xl: 48px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);--shadow-xl: 0 20px 25px rgba(0, 0, 0, .15);--transition-fast: .15s ease;--transition-base: .2s ease;--transition-slow: .3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica 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var(--transition-base)}.mixer-toggle-btn:hover{background:var(--gray-700);color:#fff}.mixer-master{padding:var(--spacing-lg);border-bottom:1px solid var(--gray-700);background:var(--gray-800)}.master-label{font-size:12px;font-weight:700;color:var(--gray-400);text-transform:uppercase;letter-spacing:.5px;margin-bottom:var(--spacing-md)}.master-fader{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--gray-700);border-radius:var(--radius-md)}.master-fader-label{font-size:14px;color:var(--gray-300);white-space:nowrap}.master-fader-value{min-width:45px;text-align:right;font-weight:700;color:var(--primary);font-size:14px}.mixer-content{flex:1;overflow-y:auto;background:var(--gray-900)}.video-area{flex:1;display:flex;flex-direction:column;background:var(--gray-900);position:relative;overflow:hidden}.video-grid{flex:1;display:grid;gap:var(--spacing-sm);padding:var(--spacing-md);overflow-y:auto}.video-grid[data-count="1"]{grid-template-columns:1fr}.video-grid[data-count="2"],.video-grid[data-count="3"],.video-grid[data-count="4"]{grid-template-columns:repeat(2,1fr)}.video-grid[data-count="5"],.video-grid[data-count="6"],.video-grid[data-count="7"],.video-grid[data-count="8"],.video-grid[data-count="9"]{grid-template-columns:repeat(3,1fr)}.participant-tile{background:var(--gray-800);border-radius:var(--radius-md);position:relative;overflow:hidden;aspect-ratio:16 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var(--transition-base);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-icon{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;background:var(--gray-700);color:#fff;border:none;cursor:pointer;transition:all 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(max-width: 768px){.top-nav{padding:var(--spacing-sm) var(--spacing-md)}.nav-room-info{display:none}.side-panel{position:fixed;right:0;top:64px;bottom:80px;width:100%;max-width:360px;z-index:200;box-shadow:var(--shadow-xl)}.mixer-panel{position:fixed;left:0;top:64px;bottom:80px;width:100%;max-width:320px;z-index:200;box-shadow:var(--shadow-xl)}.video-grid{grid-template-columns:1fr!important}.control-bar{padding:var(--spacing-sm) var(--spacing-md);height:70px}.btn-icon{width:44px;height:44px;font-size:18px}}.spinner{width:40px;height:40px;border:4px solid var(--gray-600);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes 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var(--transition-base)}.mixer-channel:hover{border-color:var(--primary);background:var(--gray-750);transform:translate(2px)}.mixer-channel:last-child{margin-bottom:0}.mixer-channel-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.mixer-channel-icon{width:32px;height:32px;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;box-shadow:0 2px 4px 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#667eea66}.mixer-toggle-control.hidden{display:none}.metronome-panel{padding:var(--spacing-md)}.metronome-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md)}.metronome-icon{font-size:1.5rem}.metronome-title{font-size:1rem;font-weight:600;color:var(--gray-200)}.metronome-controls{display:flex;flex-direction:column;gap:var(--spacing-md)}.btn-metronome{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);padding:var(--spacing-md);background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow-md)}.btn-metronome:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-metronome:active{transform:translateY(0)}.btn-metronome.active{background:linear-gradient(135deg,var(--error),#dc2626)}.btn-metronome .icon{font-size:1.2rem}.metronome-settings{display:flex;flex-direction:column;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--gray-800);border-radius:var(--radius-md)}.metronome-label{display:flex;flex-direction:column;gap:var(--spacing-xs);color:var(--gray-300);font-size:.875rem}.metronome-label span:first-child{font-weight:600;color:var(--gray-200)}.metronome-label .value{display:inline-block;min-width:50px;text-align:right;font-weight:600;color:var(--primary-light)}.metronome-label .select{padding:var(--spacing-sm);background:var(--gray-700);color:var(--gray-200);border:1px solid var(--gray-600);border-radius:var(--radius-sm);font-size:.875rem;cursor:pointer;transition:all .2s ease}.metronome-label .select:hover{border-color:var(--primary)}.metronome-label .select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #667eea1a}.metronome-visual{margin-top:var(--spacing-md);padding:var(--spacing-md);background:var(--gray-800);border-radius:var(--radius-md)}.beat-indicators{display:flex;gap:var(--spacing-sm);justify-content:center}.beat-indicator{width:40px;height:40px;border-radius:var(--radius-full);background:var(--gray-700);border:2px solid var(--gray-600);transition:all .1s ease;display:flex;align-items:center;justify-content:center}.beat-indicator.active{background:var(--primary);border-color:var(--primary-light);box-shadow:0 0 20px #667eea99;transform:scale(1.2)}.beat-indicator.accent{background:var(--accent);border-color:#fbbf24;box-shadow:0 0 20px #f59e0b99}.metronome-indicator{padding:var(--spacing-md);text-align:center}.metronome-status{display:inline-block;padding:var(--spacing-sm) var(--spacing-md);background:var(--gray-800);color:var(--gray-400);border-radius:var(--radius-md);font-size:.875rem;transition:all .3s ease}.metronome-status.active{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-weight:600;box-shadow:var(--shadow-md)}@media (max-width: 768px){.beat-indicator{width:32px;height:32px}.metronome-settings{padding:var(--spacing-sm)}}.audio-device-selector{background:var(--gray-800);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-bottom:var(--spacing-md)}.device-selector-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-md);padding-bottom:var(--spacing-md);border-bottom:1px solid var(--gray-700)}.device-icon{font-size:24px}.device-title{font-size:16px;font-weight:700;color:#fff}.device-selector-controls{display:flex;flex-direction:column;gap:var(--spacing-md)}.device-label{display:flex;flex-direction:column;gap:var(--spacing-sm);font-size:14px;color:var(--gray-300)}.device-label>span{font-weight:600;color:var(--gray-200)}.device-select-wrapper{display:flex;gap:var(--spacing-sm);align-items:center}.device-select{flex:1;padding:var(--spacing-sm) var(--spacing-md);background:var(--gray-700);border:1px solid var(--gray-600);border-radius:var(--radius-sm);color:#fff;font-size:14px;cursor:pointer;transition:all var(--transition-base)}.device-select:hover{background:var(--gray-600);border-color:var(--gray-500)}.device-select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #667eea1a}.btn-refresh{width:36px;height:36px;padding:0;background:var(--gray-700);border:1px solid var(--gray-600);border-radius:var(--radius-sm);color:var(--gray-300);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-base)}.btn-refresh:hover{background:var(--gray-600);color:#fff;transform:rotate(90deg)}.btn-refresh:disabled{opacity:.5;cursor:not-allowed;transform:none}.audio-level-meter{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:var(--gray-700);border-radius:var(--radius-sm);transition:all var(--transition-base)}.audio-level-meter.clipping-warning{background:#ef44441a;border:1px solid var(--error)}.level-label{font-size:13px;color:var(--gray-300);white-space:nowrap;min-width:100px}.level-bar-container{flex:1;height:8px;background:var(--gray-600);border-radius:var(--radius-full);overflow:hidden;position:relative}.level-bar{height:100%;border-radius:var(--radius-full);transition:width 50ms linear,background-color var(--transition-base);position:relative}.level-bar.level-low{background:linear-gradient(90deg,var(--success),var(--success))}.level-bar.level-medium{background:linear-gradient(90deg,var(--success),var(--warning))}.level-bar.level-high{background:linear-gradient(90deg,var(--warning),var(--error))}.level-bar.level-clipping{background:var(--error);animation:pulse-error .5s infinite}@keyframes pulse-error{0%,to{opacity:1}50%{opacity:.7}}.level-value{min-width:45px;text-align:right;font-weight:700;font-size:13px;color:var(--gray-200)}.audio-level-meter.clipping-warning .level-value{color:var(--error)}.device-info{padding:var(--spacing-md);background:var(--gray-750);border-radius:var(--radius-sm);border-left:3px solid var(--info)}.info-text{font-size:13px;color:var(--gray-300);line-height:1.6;margin-bottom:var(--spacing-sm)}.info-text:last-child{margin-bottom:0}.info-text strong{color:var(--gray-100);font-weight:600}@media (max-width: 768px){.audio-device-selector{padding:var(--spacing-md)}.device-select-wrapper{flex-direction:column}.btn-refresh{width:100%}.audio-level-meter{flex-direction:column;align-items:stretch}.level-label{min-width:auto}}.btn-add-instrument{width:100%;padding:var(--spacing-md);background:var(--gray-700);border:2px dashed var(--gray-600);border-radius:var(--radius-md);color:var(--gray-300);font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);transition:all var(--transition-base);margin-top:var(--spacing-md)}.btn-add-instrument:hover{background:var(--gray-600);border-color:var(--primary);color:#fff;transform:translateY(-2px)}.btn-add-instrument .btn-icon{font-size:20px;font-weight:700}.instrument-item{background:var(--gray-750);border-radius:var(--radius-md);padding:var(--spacing-md);margin-bottom:var(--spacing-sm);border:1px solid var(--gray-700)}.instrument-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-md)}.instrument-name-input{flex:1;padding:var(--spacing-sm);background:var(--gray-700);border:1px solid var(--gray-600);border-radius:var(--radius-sm);color:#fff;font-size:14px;font-weight:600}.instrument-name-input:focus{outline:none;border-color:var(--primary)}.btn-remove-instrument{width:32px;height:32px;padding:0;background:transparent;border:1px solid var(--gray-600);border-radius:var(--radius-sm);color:var(--error);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-base)}.btn-remove-instrument:hover{background:var(--error);color:#fff;border-color:var(--error)}.btn-confirm-device{width:100%;padding:var(--spacing-md);background:var(--primary);border:none;border-radius:var(--radius-md);color:#fff;font-size:14px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);transition:all var(--transition-base);margin-top:var(--spacing-md)}.btn-confirm-device:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow-md)}.btn-confirm-device:active{transform:translateY(0)}.instrument-compact{background:var(--gray-750);border-radius:var(--radius-md);padding:var(--spacing-md);margin-bottom:var(--spacing-sm);border:1px solid var(--gray-700)}.instrument-compact-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--spacing-sm)}.instrument-compact-name{font-size:14px;font-weight:600;color:#fff;flex:1}.instrument-compact-actions{display:flex;gap:var(--spacing-xs)}.btn-edit-instrument,.btn-remove-instrument-compact{width:28px;height:28px;padding:0;background:transparent;border:1px solid var(--gray-600);border-radius:var(--radius-sm);color:var(--gray-400);font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--transition-base)}.btn-edit-instrument:hover{background:var(--gray-600);color:#fff;border-color:var(--primary)}.btn-remove-instrument-compact:hover{background:var(--error);color:#fff;border-color:var(--error)}.instrument-volume-control{display:flex;align-items:center;gap:var(--spacing-md)}.instrument-volume-label{font-size:13px;color:var(--gray-400);min-width:60px}.instrument-volume-slider{flex:1}.instrument-volume-value{min-width:45px;text-align:right;font-weight:600;font-size:13px;color:var(--primary)}.audio-banner{position:fixed;top:80px;left:50%;transform:translate(-50%);z-index:9999;background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:var(--radius-lg);padding:var(--spacing-lg) var(--spacing-xl);box-shadow:var(--shadow-xl);cursor:pointer;transition:all var(--transition-base);animation:slideDown .3s ease}.audio-banner:hover{transform:translate(-50%) translateY(-2px);box-shadow:0 25px 35px #0003}.audio-banner.hidden{display:none}.audio-banner-content{display:flex;align-items:center;gap:var(--spacing-md)}.audio-banner-icon{font-size:32px;animation:pulse 2s infinite}.audio-banner-text{display:flex;flex-direction:column;gap:4px}.audio-banner-title{font-size:16px;font-weight:700;color:#fff}.audio-banner-subtitle{font-size:13px;color:#ffffffe6}@keyframes slideDown{0%{opacity:0;transform:translate(-50%) translateY(-20px)}to{opacity:1;transform:translate(-50%) translateY(0)}}