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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 1200px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 25px;
    font-size: 28px;
}

.video-container {
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 30px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
    height: 480px;
}

#videoPlayer {
    width: 100%;
    height: 100%;
    display: block;
    background: #000;
}

.button-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
}

.video-btn {
    padding: 15px 20px;
    font-size: 16px;
    font-weight: 500;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.video-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.video-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.4);
}

.video-btn.active {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    box-shadow: 0 6px 20px rgba(245, 87, 108, 0.5);
}

@media (max-width: 768px) {
    .button-container {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .video-btn {
        font-size: 14px;
        padding: 12px 15px;
    }
    
    h1 {
        font-size: 24px;
    }
}

@media (max-width: 480px) {
    .button-container {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 20px;
    }
}