* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            color: #2d3748;
            overflow-x: hidden;
            height: 100%;
            -webkit-overflow-scrolling: touch;
        }

        html {
            height: 100%;
            overflow: auto;
        }

        .header {
            position: relative;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 18px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            border-bottom: 1px solid rgba(0, 0, 0, 0.08);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05);
        }

        .brand {
            font-size: 28px;
            font-weight: 700;
            color: #1a202c;
            text-decoration: none;
            letter-spacing: -0.5px;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 40px;
        }

        .nav-item {
            color: #4a5568;
            text-decoration: none;
            font-size: 16px;
            font-weight: 500;
            transition: all 0.3s;
            position: relative;
            padding: 5px 0;
        }

        .nav-item:hover {
            color: #1a202c;
        }

        .nav-item::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: #1a202c;
            transition: width 0.3s;
        }

        .nav-item:hover::after {
            width: 100%;
        }

        .main-content {
            position: relative;
            min-height: calc(100vh - 200px);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 30px 20px;
            touch-action: manipulation;
        }

        .video-container {
            position: relative;
            width: 100%;
            max-width: 380px;
            height: 700px;
            border-radius: 0;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
            background-color: #000;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .video-element {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: contain;
            z-index: 1;
        }

        .play-button {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80px;
            height: 80px;
            background: rgba(255, 255, 255, 0.95);
            border: none;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
            z-index: 10;
            -webkit-tap-highlight-color: transparent;
            user-select: none;
            touch-action: manipulation;
            opacity: 1;
        }

        .play-button.hidden {
            opacity: 0;
            pointer-events: none;
        }

        .play-button:hover {
            background: white;
            transform: translate(-50%, -50%) scale(1.1);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
        }

        .play-icon {
            width: 0;
            height: 0;
            border-left: 24px solid #333;
            border-top: 14px solid transparent;
            border-bottom: 14px solid transparent;
            margin-left: 4px;
        }

        .pause-icon {
            display: none;
            width: 24px;
            height: 24px;
        }

        .pause-icon div {
            width: 8px;
            height: 24px;
            background: #333;
            display: inline-block;
            margin: 0 2px;
        }

        .video-controls {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
            padding: 20px 15px 15px;
            z-index: 15;
            opacity: 1;
            transition: opacity 0.3s;
        }

        .video-controls.hide {
            opacity: 0;
        }

        .controls-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 8px;
        }

        .time-display {
            font-size: 14px;
            color: white;
            font-weight: 500;
            white-space: nowrap;
        }

        .control-buttons {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .control-button {
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 6px;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0.85;
            touch-action: manipulation;
            border-radius: 50%;
        }

        .control-button:hover {
            opacity: 1;
            background: rgba(255, 255, 255, 0.1);
        }

        .progress-container {
            position: relative;
            width: 100%;
            height: 4px;
            background: rgba(255, 255, 255, 0.3);
            border-radius: 2px;
            cursor: pointer;
            touch-action: manipulation;
        }

        .progress-fill {
            height: 100%;
            width: 0%;
            background: white;
            border-radius: 2px;
            position: relative;
        }

        .progress-handle {
            position: absolute;
            right: -6px;
            top: 50%;
            transform: translateY(-50%);
            width: 12px;
            height: 12px;
            background: white;
            border-radius: 50%;
            cursor: pointer;
        }

        .footer {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 25px 20px;
            text-align: center;
            border-top: 1px solid rgba(0, 0, 0, 0.08);
        }

        .footer-content {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 30px;
            flex-wrap: wrap;
        }

        .footer-text {
            color: #4a5568;
            font-size: 14px;
            font-weight: 500;
        }

        .footer-link {
            color: #4a5568;
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s;
        }

        .footer-link:hover {
            color: #1a202c;
        }

        .video-container.fullscreen {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            max-width: none;
            max-height: none;
            z-index: 9999;
            border-radius: 0;
        }

        .loading-spinner {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 50px;
            height: 50px;
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-top: 4px solid white;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            z-index: 5;
            display: none;
        }

        .loading-spinner.show {
            display: block;
        }

        @keyframes spin {
            0% { transform: translate(-50%, -50%) rotate(0deg); }
            100% { transform: translate(-50%, -50%) rotate(360deg); }
        }

        @media (max-width: 768px) {
            .header {
                padding: 15px 20px;
            }

            .brand {
                font-size: 24px;
            }

            .header-right {
                gap: 25px;
            }

            .nav-item {
                font-size: 15px;
            }

            .main-content {
                padding: 0;
                min-height: calc(100vh - 180px);
            }

            .video-container {
                max-width: 100%;
                width: 100vw;
                max-height: calc(100vh - 200px);
                height: auto;
                aspect-ratio: 9/16;
                border-radius: 0;
                margin: 0;
                box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
            }

            .play-button {
                width: 70px;
                height: 70px;
            }

            .play-icon {
                border-left: 20px solid #333;
                border-top: 12px solid transparent;
                border-bottom: 12px solid transparent;
                margin-left: 3px;
            }

            .video-controls {
                padding: 15px 12px 12px;
            }

            .controls-top {
                margin-bottom: 6px;
            }

            .time-display {
                font-size: 13px;
            }

            .control-buttons {
                gap: 12px;
            }

            .control-button svg {
                width: 18px;
                height: 18px;
            }

            .progress-container {
                height: 3px;
            }

            .progress-handle {
                width: 10px;
                height: 10px;
                right: -5px;
            }

            .footer {
                padding: 20px 15px;
            }

            .footer-content {
                flex-direction: column;
                gap: 12px;
            }

            .footer-text, .footer-link {
                font-size: 13px;
            }

            .video-container.fullscreen {
                max-height: none;
                aspect-ratio: auto;
            }
        }

        @media (max-width: 480px) {
            .header {
                padding: 12px 15px;
            }

            .brand {
                font-size: 22px;
            }

            .header-right {
                gap: 20px;
            }

            .nav-item {
                font-size: 14px;
            }

            .main-content {
                padding: 0;
            }

            .video-container {
                width: 100vw;
                height: calc(100vh - 220px);
                max-height: 650px;
                border-radius: 0;
                box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
            }

            .play-button {
                width: 60px;
                height: 60px;
            }

            .play-icon {
                border-left: 18px solid #333;
                border-top: 10px solid transparent;
                border-bottom: 10px solid transparent;
            }

            .video-controls {
                padding: 12px 10px 10px;
            }

            .time-display {
                font-size: 12px;
            }

            .control-buttons {
                gap: 10px;
            }

            .control-button svg {
                width: 16px;
                height: 16px;
            }
        }