:root{--bg-main: #f8fafc;--bg-card: #ffffff;--bg-secondary: #f1f5f9;--bg-hover: #e2e8f0;--text-main: #0f172a;--text-muted: #475569;--text-light: #64748b;--primary: #2563eb;--primary-hover: #1d4ed8;--primary-light: #eff6ff;--danger: #dc2626;--danger-hover: #b91c1c;--danger-light: #fef2f2;--success: #16a34a;--success-light: #f0fdf4;--border: #e2e8f0;--border-focus: #2563eb;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--radius: 8px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .08), 0 2px 4px -2px rgba(0, 0, 0, .04)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-main);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.app-container{min-height:100vh;display:flex;flex-direction:column}.main-content{flex:1;padding:24px 16px;max-width:1200px;margin:0 auto;width:100%}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;font-size:14px;font-weight:500;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:background-color .15s ease,border-color .15s ease;font-family:inherit}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--primary-hover)}.btn-secondary{background-color:#fff;color:var(--text-main);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background-color:var(--bg-secondary)}.btn-danger{background-color:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background-color:var(--danger-hover)}.btn-icon{width:44px;height:44px;border-radius:50%;padding:0;display:flex;align-items:center;justify-content:center;background-color:#fff;border:1px solid var(--border);color:var(--text-main)}.btn-icon:hover{background-color:var(--bg-secondary)}.btn-icon.active{background-color:var(--primary);color:#fff;border-color:var(--primary)}.btn-icon.danger{background-color:var(--danger-light);color:var(--danger);border-color:#fca5a5}.btn:disabled{opacity:.6;cursor:not-allowed}.form-group{margin-bottom:18px}.form-label{display:block;font-size:13px;font-weight:600;color:var(--text-main);margin-bottom:6px}.form-input{width:100%;padding:10px 14px;font-size:14px;border:1px solid var(--border);border-radius:var(--radius);background-color:#fff;color:var(--text-main);font-family:inherit;outline:none;transition:border-color .15s ease,box-shadow .15s ease}.form-input:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px #2563eb26}.form-input::placeholder{color:var(--text-light)}.alert{padding:12px 16px;border-radius:var(--radius);font-size:14px;margin-bottom:16px;display:flex;align-items:center;gap:10px}.alert-danger{background-color:var(--danger-light);border:1px solid #fecaca;color:#991b1b}.alert-success{background-color:var(--success-light);border:1px solid #bbf7d0;color:#166534}.alert-info{background-color:var(--primary-light);border:1px solid #bfdbfe;color:#1e40af}.navbar{background-color:#fff;border-bottom:1px solid var(--border);padding:0 24px;height:64px;display:flex;align-items:center;justify-content:space-between}.navbar-brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;color:var(--text-main);text-decoration:none}.navbar-brand:hover{text-decoration:none}.navbar-logo{color:var(--primary)}.navbar-user{display:flex;align-items:center;gap:14px}.user-badge{font-size:14px;color:var(--text-muted)}.user-badge strong{color:var(--text-main)}.meeting-container{display:flex;flex-direction:column;height:calc(100vh - 64px);background-color:#0b1120;position:relative;overflow:hidden}.meeting-header{padding:12px 20px;background-color:#0f172a;border-bottom:1px solid #1e293b;display:flex;align-items:center;justify-content:space-between;color:#fff}.meeting-title-area{display:flex;align-items:center;gap:12px}.meeting-room-badge{background-color:#1e293b;border:1px solid #334155;color:#94a3b8;padding:4px 10px;border-radius:4px;font-size:13px;font-family:monospace;display:flex;align-items:center;gap:8px}.copy-btn{background:none;border:none;color:#60a5fa;cursor:pointer;padding:0;font-size:12px}.copy-btn:hover{text-decoration:underline}.meeting-main{flex:1;display:flex;overflow:hidden;position:relative}.video-grid-wrapper{flex:1;display:flex;align-items:center;justify-content:center;padding:16px;overflow-y:auto}.video-grid{display:grid;gap:16px;width:100%;height:100%;max-width:1200px;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));align-content:center}.video-card{position:relative;background-color:#1e293b;border-radius:var(--radius);overflow:hidden;aspect-ratio:16 / 9;box-shadow:0 4px 12px #0006;display:flex;align-items:center;justify-content:center;border:1px solid #334155}.video-element{width:100%;height:100%;object-fit:cover}.video-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;color:#94a3b8;gap:12px}.avatar-circle{width:68px;height:68px;border-radius:50%;background-color:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:26px;font-weight:600}.participant-overlay{position:absolute;bottom:12px;left:12px;background-color:#0f172ad9;color:#fff;padding:4px 10px;border-radius:4px;font-size:12px;font-weight:500;display:flex;align-items:center;gap:8px}.participant-status{position:absolute;top:12px;right:12px;display:flex;gap:6px}.status-badge{background-color:#0f172ad9;color:#f87171;padding:4px 6px;border-radius:4px;font-size:11px;display:flex;align-items:center}.meeting-controls-bar{background-color:#0f172a;border-top:1px solid #1e293b;padding:12px 20px;display:flex;align-items:center;justify-content:center;gap:16px;z-index:10}.side-panel{width:360px;background-color:#fff;border-left:1px solid var(--border);display:flex;flex-direction:column;height:100%;z-index:20}.panel-header{padding:16px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}.panel-title{font-size:15px;font-weight:600;color:var(--text-main);display:flex;align-items:center;gap:8px}.close-panel-btn{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:4px}.panel-body{flex:1;padding:16px;overflow-y:auto;display:flex;flex-direction:column}.whiteboard-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background-color:#0f172af2;z-index:50;display:flex;flex-direction:column}.whiteboard-header{background-color:#fff;padding:12px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.whiteboard-toolbar{display:flex;align-items:center;gap:12px}.color-option{width:24px;height:24px;border-radius:50%;border:2px solid transparent;cursor:pointer}.color-option.active{box-shadow:0 0 0 2px #fff,0 0 0 4px var(--primary)}.canvas-container{flex:1;position:relative;background-color:#fff;margin:16px;border-radius:var(--radius);overflow:hidden;box-shadow:0 4px 12px #0003}.whiteboard-canvas{width:100%;height:100%;display:block;cursor:crosshair;touch-action:none}.chat-messages{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;margin-bottom:16px}.chat-bubble{padding:8px 12px;border-radius:var(--radius);max-width:85%;font-size:13px;word-break:break-word}.chat-bubble.mine{align-self:flex-end;background-color:var(--primary-light);border:1px solid #bfdbfe;color:#1e3a8a}.chat-bubble.theirs{align-self:flex-start;background-color:var(--bg-secondary);border:1px solid var(--border);color:var(--text-main)}.chat-sender{font-size:11px;font-weight:600;margin-bottom:2px;color:var(--text-muted)}.file-list{display:flex;flex-direction:column;gap:10px}.file-item{padding:12px;border:1px solid var(--border);border-radius:var(--radius);display:flex;align-items:center;justify-content:space-between;background-color:var(--bg-card)}.file-info{display:flex;flex-direction:column;gap:2px;overflow:hidden}.file-name{font-size:13px;font-weight:600;color:var(--text-main);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-meta{font-size:11px;color:var(--text-light)}@media (max-width: 768px){.side-panel{position:absolute;top:0;right:0;bottom:0;width:100%}.video-grid{grid-template-columns:1fr}.meeting-controls-bar{gap:8px;padding:8px 12px}.btn-icon{width:38px;height:38px}}