:root {
    --panel-bg: #141419;
    --border-color: #2a2a35;
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --bg-color: #0d0d12;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

.sidebar {
    width: 320px;
    height: 100%;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 10;
    background: var(--panel-bg);
    border-right: 1px solid var(--border-color);
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.sidebar-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
    margin-bottom: 16px;
}

.grid-controls {
    display: flex;
    gap: 8px;
}

.grid-controls button {
    flex: 1;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 0;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.grid-controls button:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.grid-controls button.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.search-box {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.search-box input {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: 8px;
    outline: none;
    transition: border-color 0.2s;
}

.search-box input:focus {
    border-color: var(--accent);
}

.camera-list {
    list-style: none;
    overflow-y: auto;
    flex: 1;
    padding: 0 12px 12px 12px;
}

.group-header {
    padding: 12px 10px;
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: sticky;
    top: 0;
    background-color: var(--panel-bg);
    z-index: 10;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.group-header:hover {
    background-color: #1a1a24;
}

.group-items {
    padding-top: 8px;
    padding-bottom: 8px;
}

.camera-list::-webkit-scrollbar {
    width: 6px;
}
.camera-list::-webkit-scrollbar-thumb {
    background: #2a2a35;
    border-radius: 3px;
}

.cctv-item {
    padding: 12px 16px;
    margin-bottom: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    background: transparent;
    border: 1px solid transparent;
}

.cctv-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--border-color);
}

.cctv-item.playing {
    border-color: var(--accent);
    background: rgba(59, 130, 246, 0.1);
}

.cctv-name {
    font-size: 0.95rem;
    font-weight: 500;
}

.cctv-status {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #10b981;
}

.grid-container {
    flex: 1;
    padding: 16px;
    display: grid;
    gap: 16px;
    overflow: hidden;
    height: 100%;
    transition: all 0.3s ease;
}

.grid-container[data-layout="1"] {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
}

.grid-container[data-layout="4"] {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
}

.grid-container[data-layout="9"] {
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 1fr);
}

.video-slot {
    position: relative;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.video-slot.empty {
    background: #0d0d12;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.empty-text {
    color: var(--text-secondary);
    font-weight: 500;
    user-select: none;
}

.video-wrapper {
    flex: 1;
    position: relative;
    width: 100%;
    height: 100%;
}

video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    padding: 12px 16px;
    background: linear-gradient(to bottom, rgba(0,0,0,0.8) 0%, transparent 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    pointer-events: none;
    z-index: 5;
}

.video-title {
    font-weight: 600;
    font-size: 0.9rem;
}

.close-btn {
    pointer-events: auto;
    background: #2a2a35;
    border: none;
    color: #fff;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 14px;
}

.close-btn:hover {
    background: rgba(239, 68, 68, 0.8);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 4;
    pointer-events: none;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.custom-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px 16px;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 5;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.video-slot:hover .custom-controls {
    opacity: 1;
}

.control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #fff;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.2s;
    font-size: 14px;
}

.control-btn:hover {
    background: var(--accent);
}

.live-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #f87171;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.live-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #ef4444;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.buffer-health {
    font-size: 0.8rem;
    font-weight: 500;
    font-family: monospace;
    background: rgba(0,0,0,0.5);
    padding: 4px 8px;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    .grid-controls {
        display: none;
    }

    .sidebar {
        width: 100%;
        flex: 1;
        border-right: none;
        border-top: 1px solid var(--border-color);
        order: 2;
    }

    .grid-container {
        height: auto;
        flex: none;
        overflow-y: hidden;
        order: 1;
        padding: 8px;
        gap: 8px;
    }

    .grid-container[data-layout="1"],
    .grid-container[data-layout="4"],
    .grid-container[data-layout="9"] {
        grid-template-columns: 1fr;
        grid-auto-rows: min-content; 
    }

    .video-slot {
        aspect-ratio: 4 / 3;
    }
    
    .video-title {
        font-size: 0.7rem;
    }
}