/* ========================================
   科研风格视频网站样式表
   配色方案：深蓝灰 + 专业蓝
   适配分辨率：1920x1080
   ======================================== */

/* === 全局样式 === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #2d3748;
    background-color: #1e2a3a;
    min-height: 100vh;
}

/* === 主页面样式 === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

.main-header {
    text-align: center;
    margin-bottom: 48px;
    padding: 32px 0;
    background-color: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.main-header h1 {
    font-size: 36px;
    font-weight: 600;
    color: #2c5aa0;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.subtitle {
    font-size: 16px;
    color: #64748b;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* === 视频列表样式 === */
.video-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.video-item {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 32px;
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.video-item:hover {
    border-color: #2c5aa0;
    box-shadow: 0 4px 12px rgba(44, 90, 160, 0.15);
    transform: translateY(-2px);
}

.video-icon {
    font-size: 48px;
    flex-shrink: 0;
}

.video-content {
    flex: 1;
}

.video-title {
    font-size: 24px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
}

.video-description {
    font-size: 15px;
    color: #64748b;
    line-height: 1.6;
}

.video-button {
    display: inline-block;
    padding: 12px 32px;
    background-color: #2c5aa0;
    color: #ffffff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.video-button:hover {
    background-color: #1e4a8a;
    transform: translateX(4px);
    box-shadow: 0 4px 8px rgba(44, 90, 160, 0.3);
}

/* === 页脚样式 === */
.main-footer {
    text-align: center;
    margin-top: 64px;
    padding: 24px 0;
    color: #94a3b8;
    font-size: 14px;
    border-top: 1px solid #334155;
}

/* === 视频播放页面样式 === */
.video-page {
    background-color: #0f1419;
    color: #e2e8f0;
}

.video-container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 20px;
}

.video-header {
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 24px 0;
    margin-bottom: 32px;
    border-bottom: 1px solid #334155;
}

.back-button {
    display: inline-block;
    padding: 10px 24px;
    background-color: #2c5aa0;
    color: #ffffff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.back-button:hover {
    background-color: #1e4a8a;
    transform: translateX(-4px);
}

.video-page-title {
    font-size: 28px;
    font-weight: 600;
    color: #f8f9fa;
}

/* === 视频播放器样式 === */
.video-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.video-wrapper {
    width: 100%;
    max-width: 1280px;
    background-color: #000000;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.video-wrapper video {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16 / 9;
}

/* === 视频信息区域 === */
.video-info {
    width: 100%;
    max-width: 1600px;
    padding: 24px 32px;
    background-color: #1e2a3a;
    border: 1px solid #334155;
    border-radius: 8px;
}

.video-description-text {
    font-size: 15px;
    color: #94a3b8;
    line-height: 1.8;
}

/* === 响应式设计 === */
@media (max-width: 1024px) {
    .video-item {
        flex-direction: column;
        text-align: center;
    }
    
    .video-button {
        align-self: center;
    }
}

@media (max-width: 768px) {
    .main-header h1 {
        font-size: 28px;
    }
    
    .video-title {
        font-size: 20px;
    }
    
    .video-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .video-page-title {
        font-size: 24px;
    }
}

/* === 视频控件自定义（可选） === */
video::-webkit-media-controls-panel {
    background-color: rgba(30, 42, 58, 0.9);
}

video::-webkit-media-controls-play-button,
video::-webkit-media-controls-volume-slider {
    filter: brightness(1.2);
}