:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
    --dark-color: #2c3e50;
}

body {
    background: linear-gradient(135deg, #1a2a6c, #b21f1f, #1a2a6c);
    background-attachment: fixed;
    color: #fff;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
}

.container-wrapper {
    background: rgba(25, 25, 35, 0.95);
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    margin: 1rem auto;
    padding: 2.5rem;
    max-width: 1200px;
}

.video-container {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    background: #000;
}

.video-container .video-js {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.nav-buttons {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    display: flex;
    gap: 10px;
}

.nav-btn {
    background: rgba(44, 62, 80, 0.9);
    border: none;
    border-radius: 50px;
    color: white;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.4);
}

.video-title {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    font-weight: 700;
    color: #fff;
    position: relative;
    padding-bottom: 15px;
}

.video-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.navigation-btns {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}

.nav-link-btn {
    background: linear-gradient(135deg, var(--primary-color), #2980b9);
    border: none;
    border-radius: 50px;
    padding: 12px 25px;
    color: white;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.nav-link-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.nav-link-btn.prev {
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
}

.nav-link-btn.next {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
}

.info-section {
    background: rgba(30, 30, 40, 0.8);
    border-radius: 15px;
    padding: 20px;
    margin-top: 25px;
    border-left: 4px solid var(--primary-color);
}

/* Video.js 自定义皮肤 */
.video-js .vjs-big-play-button {
    background: rgba(231, 76, 60, 0.7);
    border: none;
    border-radius: 50%;
    width: 80px;
    height: 80px;
    line-height: 80px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.video-js .vjs-big-play-button:hover {
    background: rgba(231, 76, 60, 0.9);
}

.vjs-poster {
    background-size: cover !important;
}

@media (max-width: 768px) {
    .container-wrapper {
        padding: 1.5rem;
        margin: 1rem;
    }
    
    .video-title {
        font-size: 1.8rem;
    }
    
    .nav-link-btn {
        padding: 10px 15px;
        font-size: 0.9rem;
    }
    
    .video-js .vjs-big-play-button {
        width: 60px;
        height: 60px;
        line-height: 60px;
    }
}

.alink {
    color: white;
}