:root {
    --bg-color: #0f0f13;
    --text-color: #ffffff;
    --primary-color: #ff0000;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    background-image: radial-gradient(circle at top right, rgba(255,0,0,0.1), transparent 400px),
                      radial-gradient(circle at bottom left, rgba(0,100,255,0.1), transparent 400px);
}

.app-container {
    max-width: 100%;
    margin: 0;
    padding: 0;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 4px;
    background-color: #000;
}

.video-card {
    background: #111;
    border: none;
    border-radius: 0;
    overflow: hidden;
    position: relative;
    transition: transform 0.2s;
}

.video-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%; /* Tỉ lệ 16:9 */
    height: 0;
    overflow: hidden;
    background: #000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.card-footer {
    padding: 5px 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0,0,0,0.8);
    font-size: 0.8rem;
}

.channel-info {
    font-weight: 500;
    color: #e0e0e0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

.live-badge {
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    animation: pulse 2s infinite;
}

.remove-btn {
    background: #2a2a35;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #ff4444;
    cursor: pointer;
    font-size: 1rem;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.remove-btn:hover {
    background: #ff4444;
    color: white;
    transform: scale(1.1) rotate(90deg);
}

@keyframes pulse {
    0% { opacity: 1; box-shadow: 0 0 0 0 rgba(255, 0, 0, 0.4); }
    70% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(255, 0, 0, 0); }
    100% { opacity: 1; box-shadow: 0 0 0 0 rgba(255, 0, 0, 0); }
}

.loader, .no-live-message {
    grid-column: 1 / -1;
    text-align: center;
    padding: 5rem 2rem;
    color: #888;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.1);
    border-left-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@media (max-width: 768px) {
    .video-grid {
        grid-template-columns: 1fr;
    }
}