:root{--primary: #4f46e5;--primary-dark: #4338ca;--primary-light: #e0e7ff;--danger: #ef4444;--danger-light: #fef2f2;--success: #22c55e;--success-light: #f0fdf4;--warning: #f59e0b;--bg: #f8fafc;--bg-card: #ffffff;--text: #1e293b;--text-secondary: #64748b;--border: #e2e8f0;--shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);--shadow-lg: 0 10px 25px rgba(0,0,0,.1);--radius: 12px;--radius-sm: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary:hover:not(:disabled){background:var(--primary-dark);transform:translateY(-1px)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-primary.btn-sm{padding:8px 16px;font-size:13px}.btn-outline{padding:8px 16px;background:transparent;color:var(--text-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;cursor:pointer;transition:all .2s}.btn-outline:hover{background:var(--bg);border-color:#cbd5e1}.btn-link{background:none;border:none;color:var(--primary);cursor:pointer;font-size:14px;text-decoration:underline}.btn-danger{padding:12px 24px;background:var(--danger);color:#fff;border:none;border-radius:var(--radius-sm);font-size:15px;font-weight:600;cursor:pointer}.form-group{margin-bottom:16px}.form-group label{display:block;font-size:14px;font-weight:500;color:var(--text);margin-bottom:6px}.form-group input{width:100%;padding:12px 16px;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:15px;transition:border-color .2s;outline:none}.form-group input:focus{border-color:var(--primary)}.form-group input::placeholder{color:#94a3b8}.error-text{background:var(--danger-light);color:var(--danger);padding:10px 16px;border-radius:var(--radius-sm);font-size:14px;margin-bottom:12px}.success-text{background:var(--success-light);color:#166534;padding:10px 16px;border-radius:var(--radius-sm);font-size:14px;margin-bottom:12px}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.login-card{width:100%;max-width:400px;background:#fff;border-radius:16px;padding:40px 32px;box-shadow:var(--shadow-lg);text-align:center}.login-icon{font-size:48px;margin-bottom:12px}.login-card h1{font-size:24px;margin-bottom:6px}.login-card .subtitle{color:var(--text-secondary);font-size:14px;margin-bottom:28px}.lobby-page{min-height:100vh}.lobby-header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;background:var(--bg-card);border-bottom:1px solid var(--border);box-shadow:var(--shadow)}.lobby-header h2{font-size:20px}.header-right{display:flex;align-items:center;gap:12px}.user-badge{font-size:14px;color:var(--text-secondary)}.header-right .btn-outline{padding:6px 14px}.lobby-content{max-width:640px;margin:0 auto;padding:24px 20px}.tabs{display:flex;gap:4px;background:var(--bg);padding:4px;border-radius:var(--radius-sm);margin-bottom:20px}.tab{flex:1;padding:10px 16px;border:none;background:transparent;border-radius:6px;font-size:14px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:all .2s}.tab.active{background:#fff;color:var(--primary);box-shadow:var(--shadow)}.room-list{display:flex;flex-direction:column;gap:10px}.room-card{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow);transition:box-shadow .2s}.room-card:hover{box-shadow:var(--shadow-lg)}.room-card-name{font-size:16px;font-weight:600;margin-bottom:4px}.room-card-meta{display:flex;gap:16px;font-size:13px;color:var(--text-secondary)}.empty-state{text-align:center;padding:48px 20px;color:var(--text-secondary)}.empty-icon{font-size:48px;margin-bottom:12px}.empty-state p{margin-bottom:12px;font-size:15px}.form-card{padding:24px;background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow)}.form-card h3{margin-bottom:16px;font-size:18px}.room-code-card{margin-top:20px;padding:16px;background:var(--primary-light);border-radius:var(--radius-sm);text-align:center}.code-label{font-size:14px;color:var(--text-secondary);margin-bottom:8px}.code-value{font-size:28px;font-weight:800;letter-spacing:6px;color:var(--primary);cursor:pointer;padding:8px;border-radius:6px;transition:background .2s;display:inline-block}.code-value:hover{background:#4f46e51a}.copy-hint{display:block;font-size:12px;font-weight:400;letter-spacing:0;color:var(--text-secondary);margin-top:4px}.meeting-page{min-height:100vh;display:flex;flex-direction:column;background:#1a1a2e}.meeting-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:#0000004d;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);color:#fff}.meeting-header-left{display:flex;align-items:center;gap:10px}.meeting-header h3{font-size:16px;font-weight:600;max-width:200px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.status-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.status-dot.connected{background:var(--success);animation:pulse 2s infinite}.status-dot.connecting{background:var(--warning);animation:pulse 1s infinite}.status-dot.disconnected{background:var(--danger)}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.status-text,.user-count{font-size:13px;color:#ffffffb3}.error-banner{padding:10px 16px;background:var(--danger);color:#fff;text-align:center;font-size:14px}.meeting-body{flex:1;padding:24px;overflow-y:auto}.participant-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:16px}.participant-card{background:#ffffff14;border-radius:var(--radius);padding:20px 16px;text-align:center;transition:all .3s;border:2px solid transparent}.participant-card.speaking{background:#22c55e26;border-color:var(--success);box-shadow:0 0 20px #22c55e33}.participant-card.local{background:#4f46e526}.participant-avatar{font-size:36px;margin-bottom:8px}.participant-name{color:#fff;font-size:14px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.participant-status{font-size:12px;color:#ffffff80;margin-top:4px}.participant-card.speaking .participant-status{color:var(--success)}.empty-participants{grid-column:1 / -1;text-align:center;padding:48px 20px;color:#fff6;font-size:15px}.empty-participants.error-state{color:#ef4444cc}.empty-participants.error-state p{margin-bottom:16px}.meeting-controls{display:flex;align-items:center;justify-content:center;gap:24px;padding:20px;background:#0006;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.control-btn{display:flex;flex-direction:column;align-items:center;gap:6px;width:72px;height:72px;border-radius:50%;border:2px solid rgba(255,255,255,.2);background:#ffffff14;color:#fff;cursor:pointer;transition:all .2s;padding:0}.control-btn:hover:not(:disabled){background:#ffffff26;transform:scale(1.05)}.control-btn:disabled{opacity:.4;cursor:not-allowed}.control-btn.danger{background:var(--danger);border-color:var(--danger)}.control-btn.danger:hover:not(:disabled){background:#dc2626}.control-btn.leave-btn{border-color:var(--danger)}.control-btn.leave-btn:hover:not(:disabled){background:#ef444433}.control-icon{font-size:24px}.control-label{font-size:11px;color:#ffffffb3}@media(max-width:480px){.login-card{padding:28px 20px}.code-value{font-size:22px;letter-spacing:4px}.participant-grid{grid-template-columns:repeat(2,1fr)}.meeting-controls{gap:16px}.control-btn{width:60px;height:60px}.control-icon{font-size:20px}.control-label{font-size:10px}}