* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.header {
    background: white;
    padding: 20px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.header h1 {
    font-size: 28px;
    color: #333;
    margin-bottom: 5px;
}

.subtitle {
    color: #666;
    font-size: 14px;
}

.main {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    min-height: 600px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}

.section-header h2 {
    font-size: 24px;
    color: #333;
}

.search-box {
    flex: 1;
    max-width: 400px;
}

.search-box input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
}

.room-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.room-card {
    background: #f8f9fa;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
    cursor: pointer;
}

.room-card:hover {
    border-color: #667eea;
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.2);
}

.room-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.room-id {
    font-size: 20px;
    font-weight: bold;
    color: #333;
}

.room-status {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: bold;
}

.room-status.active {
    background: #10b981;
    color: white;
}

.room-info {
    color: #666;
    font-size: 14px;
    margin-bottom: 5px;
}

.room-time {
    color: #999;
    font-size: 12px;
    margin-bottom: 15px;
}

.room-users {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #667eea;
    font-weight: bold;
    margin-bottom: 15px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #6c757d;
    color: white;
    width: auto;
}

.btn-secondary:hover {
    background: #5a6268;
}

.btn-danger {
    background: #dc3545;
    color: white;
}

.btn-danger:hover {
    background: #c82333;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
    min-height: 400px;
}

.video-card {
    background: #1a1a2e;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    aspect-ratio: 16/9;
}

.video-player {
    width: 100%;
    height: 100%;
    background: #2d2d44;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.video-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: #999;
}

.video-placeholder .avatar {
    width: 60px;
    height: 60px;
    background: #667eea;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.video-info {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    padding: 30px 15px 15px;
    color: white;
}

.video-info .user-id {
    font-weight: bold;
    margin-bottom: 5px;
}

.video-info .speaking {
    color: #10b981;
    font-size: 12px;
}

.no-video {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #999;
    min-height: 400px;
    background: #f8f9fa;
    border-radius: 12px;
}

.no-video .hint {
    font-size: 12px;
    color: #ccc;
    margin-top: 10px;
}

.controls {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.audio-control {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    min-width: 200px;
}

.audio-control label {
    font-weight: bold;
    color: #333;
}

.audio-control input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
}

.audio-control input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #667eea;
    cursor: pointer;
}

.audio-control span {
    min-width: 40px;
    text-align: center;
    font-weight: bold;
    color: #667eea;
}

.user-list {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px;
    background: white;
    border-radius: 8px;
}

.user-label {
    font-weight: bold;
    color: #333;
}

#userCount {
    font-weight: bold;
    color: #667eea;
    font-size: 18px;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.pagination button {
    padding: 8px 16px;
    border: 2px solid #667eea;
    background: white;
    color: #667eea;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.pagination button:hover:not(:disabled) {
    background: #667eea;
    color: white;
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination button.active {
    background: #667eea;
    color: white;
}

.loading {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    color: #999;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transform: translateX(400px);
    transition: transform 0.3s;
    z-index: 1000;
    max-width: 400px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid #10b981;
}

.toast.error {
    border-left: 4px solid #dc3545;
}

.toast.info {
    border-left: 4px solid #667eea;
}

.room-info {
    display: flex;
    gap: 20px;
    color: #666;
    font-size: 14px;
}

.room-info span {
    padding: 5px 15px;
    background: #f8f9fa;
    border-radius: 20px;
}

@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .room-grid {
        grid-template-columns: 1fr;
    }

    .video-grid {
        grid-template-columns: 1fr;
    }

    .controls {
        flex-direction: column;
    }

    .audio-control {
        width: 100%;
    }

    .section-header {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        max-width: 100%;
    }
}