@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--bg-app:#0f172a;--bg-sidebar:#1e293b;--bg-panel:#1e293b;--text-main:#f1f5f9;--text-muted:#94a3b8;--border-color:#334155;--primary:#3b82f6;--primary-hover:#2563eb;--success:#10b981;--success-hover:#059669;--danger:#ef4444;--danger-hover:#dc2626;--purple:#8b5cf6;--purple-hover:#7c3aed;--glass-bg:#1e293bb3;--glass-border:#ffffff1a;--glass-shadow:0 8px 32px 0 #0000004d}body{background-color:var(--bg-app);color:var(--text-main);width:100vw;height:100vh;margin:0;padding:0;font-family:Inter,sans-serif;overflow:hidden}*{box-sizing:border-box}#app{width:100vw;height:100vh;display:flex}#main-area{flex-direction:column;flex:1;display:flex;position:relative}#whiteboard-container{box-shadow:var(--glass-shadow);background:#fff;border-radius:16px;flex:1;justify-content:center;align-items:center;margin:16px 16px 0;display:flex;position:relative;overflow:hidden}#whiteboard-canvas,#overlay-canvas{width:100%;height:100%;position:absolute;top:0;left:0}#whiteboard-canvas{z-index:1;cursor:crosshair;touch-action:none}#overlay-canvas{z-index:2;pointer-events:none}#bottom-bar{justify-content:center;align-items:center;gap:16px;height:80px;margin-bottom:16px;padding:0 16px;display:flex}.glass-panel{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow);border-radius:40px;align-items:center;gap:12px;padding:12px 24px;display:flex}#status-indicator{border-right:1px solid var(--border-color);align-items:center;gap:8px;padding-right:16px;font-size:14px;font-weight:500;display:flex}.status-dot{background:var(--danger);border-radius:50%;width:10px;height:10px}.status-dot.online{background:var(--success);box-shadow:0 0 8px var(--success)}#sidebar{background-color:var(--bg-sidebar);border-left:1px solid var(--border-color);flex-direction:column;width:360px;height:100vh;min-height:0;display:flex;overflow:hidden}#sidebar-tabs{flex-shrink:0}#video-section{border-bottom:1px solid var(--border-color);flex:1;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));align-content:flex-start;gap:12px;min-height:0;padding:16px;display:grid;overflow-y:auto}.video-item{aspect-ratio:16/9;background:#000;border-radius:12px;width:100%;position:relative;overflow:hidden;box-shadow:0 4px 6px #0000004d}.video-item video{object-fit:cover;width:100%;height:100%}.video-label{color:#fff;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:10;text-overflow:ellipsis;white-space:nowrap;background:#0009;border-radius:4px;max-width:calc(100% - 16px);padding:4px 8px;font-size:12px;font-weight:500;position:absolute;bottom:8px;left:8px;overflow:hidden}#chat-section{background:var(--bg-panel);flex-direction:column;flex:1;min-height:0;display:flex;overflow:hidden}.chat-header{border-bottom:1px solid var(--border-color);flex-shrink:0;align-items:center;gap:8px;padding:12px 16px;font-size:14px;font-weight:600;display:flex}#chat-messages{flex-direction:column;flex:1;gap:12px;min-height:0;padding:16px;font-size:13.5px;display:flex;overflow-y:auto}.chat-input-area{border-top:1px solid var(--border-color);background:var(--bg-panel);flex-shrink:0;align-items:center;gap:8px;padding:12px;display:flex;position:relative}.btn{cursor:pointer;color:#fff;border:none;border-radius:20px;align-items:center;gap:6px;padding:8px 16px;font-family:Inter,sans-serif;font-size:14px;font-weight:500;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.btn:active:not(:disabled){transform:scale(.95)}.btn-primary{background:var(--primary)}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-danger{background:var(--danger)}.btn-danger:hover:not(:disabled){background:var(--danger-hover)}.btn-success{background:var(--success)}.btn-success:hover:not(:disabled){background:var(--success-hover)}.btn-purple{background:var(--purple)}.btn-purple:hover:not(:disabled){background:var(--purple-hover)}.btn-secondary{background:#64748b}.btn-secondary:hover:not(:disabled){background:#475569}.btn-warning{color:#000;background:#f59e0b;font-weight:600}.btn-warning:hover:not(:disabled){background:#d97706}.btn-icon{background:var(--border-color);width:36px;height:36px;color:var(--text-main);border-radius:50%;justify-content:center;align-items:center;padding:0;font-size:20px;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.btn-icon:hover:not(:disabled){background:#475569;transform:translateY(-2px);box-shadow:0 4px 12px #0003}.color-btn{cursor:pointer;border:2px solid #0000;border-radius:50%;width:24px;height:24px;padding:0;transition:transform .2s,border-color .2s}.color-btn:hover{transform:scale(1.1)}.color-btn.active{box-shadow:0 0 0 2px var(--bg-panel);border-color:#fff}.btn-icon.active{background:var(--primary);color:#fff}.input-field{background:var(--bg-app);border:1px solid var(--border-color);color:var(--text-main);border-radius:20px;outline:none;flex:1;padding:10px 16px;font-family:Inter,sans-serif;font-size:14px;transition:border-color .2s}.input-field:focus{border-color:var(--primary)}.input-field:disabled{opacity:.5}.upload-btn-wrapper{display:inline-block;position:relative;overflow:hidden}.upload-btn-wrapper input[type=file]{opacity:0;cursor:pointer;font-size:100px;position:absolute;top:0;left:0}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#475569;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#64748b}#emoji-picker{color:#fff;background:var(--bg-sidebar)!important;border-color:var(--border-color)!important}.emoji-item:hover{background:#ffffff1a;border-radius:4px}#page-indicator::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}#page-indicator::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}#page-indicator{-moz-appearance:textfield}