:root {
            --bg-color: #121212;
            --container-bg: #1e1e1e;
            --text-color: #e0e0e0;
            --accent-color: #bb86fc;
            --accent-hover: #9a67d3;
            --border-color: #333;
            --input-bg: #2c2c2c;
            --scrollbar-track: #2c2c2c;
            --scrollbar-thumb: #555;
            --scrollbar-hover: #777;
        }

        body {
            font-family: sans-serif;
            margin: 0;
            background-color: var(--bg-color);
            color: var(--text-color);
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
        }

        .container {
            width: 95%;
            max-width: 1600px;
            margin: 0px auto;
            padding: 20px;
            background-color: var(--container-bg);
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
            display: flex;
            flex-direction: column;
            height: calc(100vh - 40px);
            max-height: 100vh;
            /* 确保 container 可以触发 hover */
            position: relative;
            overflow: hidden;
        }

        header { 
            text-align: center;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-color);
            flex-shrink: 0;
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            transition: transform 0.3s ease;
            background-color: var(--container-bg);
            /* 防止透明背景导致文字看不清 */
        }

        .container:hover header {
            transform: translateY(0);
        }

        .container:not(:hover) header {
            transform: translateY(-100%);
        }

        header h1 {
            margin: 0 0 10px 0;
            color: var(--accent-color);
        }

        .controls {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .controls label {
            font-size: 0.9em;
        }

        .controls input[type="number"] {
            width: 50px;
            padding: 8px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            background-color: var(--input-bg);
            color: var(--text-color);
        }

        .controls button {
            padding: 8px 12px;
            border: none;
            border-radius: 4px;
            background-color: var(--accent-color);
            color: var(--bg-color);
            cursor: pointer;
            transition: background-color 0.3s ease;
            font-size: 0.9em;
        }

        .controls button:hover {
            background-color: var(--accent-hover);
        }

        .view-area {
            flex-grow: 1;
            overflow: hidden;
        }

        .hidden {
            display: none !important;
        }

        /* Grid View Specific */
        #video-grid {
            display: grid;
            gap: 10px;
            height: calc(100vh - 40px);
        }

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

        .grid-2 {
            grid-template-columns: repeat(2, 1fr);
            grid-template-rows: 1fr;
        }

        .grid-3 {
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: 1fr;
        }

        .grid-4 {
            grid-template-columns: repeat(2, 1fr);
            grid-template-rows: repeat(2, 1fr);
        }

        .grid-5,
        .grid-6 {
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(2, 1fr);
        }

        .grid-7,
        .grid-8,
        .grid-9 {
            grid-template-columns: repeat(3, 1fr);
            grid-template-rows: repeat(3, 1fr);
        }

        /* Main/Sub View Specific */
        #main-sub-view-area {
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        #main-video-player-container {
            flex-grow: 1;
            min-height: 0;
            margin-bottom: 10px;
            position: relative;
            background-color: #000;
            border: 1px solid var(--border-color);
            border-radius: 4px;
        }

        #sub-video-players-container {
            flex-shrink: 0;
            height: 25%;
            display: flex;
            overflow-x: auto;
            overflow-y: hidden;
            gap: 10px;
            padding-bottom: 5px;
            border-top: 1px solid var(--border-color);
            padding-top: 10px;
        }

        #sub-video-players-container .video-player-container {
            min-width: 200px;
            width: 25%;
            height: 100%;
            padding-top: 0;
            position: relative;
        }

        #main-video-player-container .video-player-container,
        #sub-video-players-container .video-player-container {
            height: 100%;
            width: 100%;
            padding-top: 0;
        }

        .video-player-container {
            position: relative;
            width: 100%;
            padding-top: 56.25%;
            background-color: #000;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .video-player-container.is-sub-player {
            cursor: pointer;
        }

        .video-player-container video {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: contain;
        }

        .player-controls {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background-color: rgba(30, 30, 30, 0.8);
            padding: 5px;
            display: flex;
            flex-wrap: nowrap;
            gap: 5px;
            align-items: center;
            opacity: 0;
            transition: opacity 0.3s ease;
            font-size: 0.8em;
            flex-wrap: wrap;
        }

        .video-player-container:hover .player-controls,
        .video-player-container.no-hover-hide-controls .player-controls {
            opacity: 1;
        }

        .player-controls input[type="text"] {
            flex-grow: 1;
            padding: 4px;
            border: 1px solid #444;
            border-radius: 3px;
            background-color: var(--input-bg);
            color: var(--text-color);
            min-width: 80px;
        }

        .player-controls button {
            padding: 4px 8px;
            border: none;
            border-radius: 3px;
            background-color: var(--accent-color);
            color: var(--bg-color);
            cursor: pointer;
            font-size: 0.9em;
            white-space: nowrap;
        }

        .player-controls button:hover {
            background-color: var(--accent-hover);
        }

        .stream-name-label {
            position: absolute;
            top: 10px;
            right: 10px;
            font-size: 16px;
            color: rgb(138, 138, 138);
            background-color: rgba(0, 0, 0, 0.6);
            padding: 4px 6px;
            border-radius: 4px;
            z-index: 10;
            pointer-events: none;
            max-width: 80%;
            overflow: hidden;
            white-space: nowrap;
            text-overflow: ellipsis;
        }

        footer {
            text-align: center;
            margin-top: 15px;
            padding-top: 10px;
            border-top: 1px solid var(--border-color);
            flex-shrink: 0;
            font-size: 0.9em;
        }

        #history-list {
            list-style: none;
            padding: 0;
            max-height: 100px;
            overflow-y: auto;
            background-color: var(--input-bg);
            border-radius: 4px;
            border: 1px solid var(--border-color);
            margin-top: 5px;
        }

        #history-list li {
            padding: 6px 10px;
            border-bottom: 1px solid #383838;
            cursor: pointer;
            font-size: 0.85em;
            word-break: break-all;
        }

        #history-list li:last-child {
            border-bottom: none;
        }

        #history-list li:hover {
            background-color: #3f3f3f;
        }

        /* Loading spinner */
        .loading-spinner {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 40px;
            height: 40px;
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: var(--accent-color);
            animation: spin 1s ease-in-out infinite;
            z-index: 5;
        }

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

        /* Error message */
        .error-message {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: #ff6b6b;
            background-color: rgba(0, 0, 0, 0.7);
            padding: 10px 15px;
            border-radius: 4px;
            z-index: 5;
            text-align: center;
            max-width: 80%;
        }

        /* Scrollbar styling */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

        ::-webkit-scrollbar-track {
            background: var(--scrollbar-track);
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb {
            background: var(--scrollbar-thumb);
            border-radius: 4px;
        }

        ::-webkit-scrollbar-thumb:hover {
            background: var(--scrollbar-hover);
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .controls {
                flex-direction: column;
                align-items: stretch;
            }

            .grid-2,
            .grid-3,
            .grid-4,
            .grid-5,
            .grid-6,
            .grid-7,
            .grid-8,
            .grid-9 {
                grid-template-columns: 1fr;
                grid-template-rows: auto;
            }

            .player-controls input[type="text"] {
                min-width: 100px;
            }

            #sub-video-players-container {
                height: 150px;
            }

            #sub-video-players-container .video-player-container {
                min-width: 150px;
            }
        }

        @media (max-width: 480px) {
            .player-controls {
                flex-direction: column;
                align-items: stretch;
            }

            .player-controls select,
            .player-controls input[type="text"] {
                width: 100%;
                margin-bottom: 4px;
            }

            .player-controls button {
                width: 100%;
            }
        }