/* 全局布局 */
.video-detail-container {
    margin-bottom: 20px;
    padding: 20px 30px;
    background-color: #FFFFFF;
}

/* --- 视频区域 左侧 */
.video-section {
    width: 760px;
    background-color: #fff;
    border-radius: 10px;
    min-width: 0;
}

.video-title {
    font-size: 20px;
    font-weight: 600;
    color: #333;
    margin: 0 0 15px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-player-wrapper {
    width: 100%;
    height: 570px;
    flex: 1;
    background-color: #000;
    border-radius: 10px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

#main-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 视频元信息 */
.video-meta-info {
    margin-top: 15px;
    display: flex;
    gap: 30px;
    color: #666;
    font-size: 14px;
}

/* --- 章节列表 右侧 --- */
.chapter-list-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background-color: #F6F6F6;
    border-radius: 10px;

    max-height: 570px;
}

.chapter-list-container {
    flex: 1;
    overflow-y: auto;
    padding: 10px 0;
}

/* 滚动条样式 */
.chapter-list-container::-webkit-scrollbar {
    width: 6px;
}
.chapter-list-container::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 3px;
}

/* 章节项 */
.chapter-item {
    cursor: pointer;
}

.chapter-title-row {
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s;
}

.chapter-title-row:hover {
    background-color: #f9f9f9;
}

.chapter-name {
    font-size: 15px;
    font-weight: 500;
    color: #333;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 10px;
}

.chapter-icon {
    width: 12px;
    height: 12px;
    transition: transform 0.3s;
    color: #999;
}

/* 展开状态 */
.chapter-item.expanded .chapter-icon {
    transform: rotate(90deg);
}

.sub-chapter-list {
    display: none;
    background-color: #f5f5f5;
}

.chapter-item.expanded .sub-chapter-list {
    display: block;
}

.sub-chapter-item {
    padding: 10px;
    margin: 0 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    color: #666;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 4px;
}

.sub-chapter-item:hover {
    color: #734C22;
}

.sub-chapter-item.active {
    background-color: #FFFFFF;
    color: #734C22;
}

.sub-chapter-name {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 10px;
}

.sub-chapter-status {
    font-size: 12px;
    display: flex;
    align-items: center;
}

.playing-icon {
    width: 14px;
    height: 14px;
    margin: 0 8px;
    object-fit: contain;
}

/* --- 底部信息区域 --- */
.info-section-wrapper {
    gap: 20px;
    align-items: stretch;
    justify-content: space-between;
}

.course-intro-container {
    flex: 1;
    background-color: #fff;
    border-radius: 10px;
    padding: 20px;
    min-height: 300px;
    flex-shrink: 0;
}

.lecturer-intro-container {
    width: 300px;
    background-color: #F5EBDF;
    border-radius: 10px;
    padding: 20px;
    color: #734C22;
    flex-shrink: 0;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin-bottom: 20px;
    border-left: 4px solid #B98751;
    padding-left: 10px;
}

/* 富文本内容 */
.course-rich-content {
    color: #333;
    line-height: 1.8;
}
.course-rich-content img {
    max-width: 100%;
    border-radius: 4px;
    margin: 10px 0;
}

/* 讲师信息 */
.lecturer-avatar {
    width: 260px;
    height: 260px;
    border-radius: 10px;
    object-fit: cover;
    margin-bottom: 20px;
    margin-top: 20px;
    background-color: #fff;
}

.lecturer-name {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.lecturer-desc {
    font-size: 16px;
    line-height: 1.6;
    text-align: left;
    width: 100%;
}

/* --- 自定义视频控制器 --- */
.video-controls {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(to top, rgba(0,0,0,0.8), rgba(0,0,0,0));
    padding: 10px 15px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none; /* 隐藏时允许点击穿透 */
}

.video-player-wrapper:hover .video-controls {
    opacity: 1;
    pointer-events: auto;
}

/* 覆盖播放按钮 */
.video-overlay-play {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
    opacity: 0.8;
    transition: all 0.3s;
    z-index: 10;
}

.video-overlay-play:hover {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}

.video-player-wrapper.playing .video-overlay-play {
    display: none;
}

/* 进度条 */
.progress-bar-container {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.3);
    border-radius: 2px;
    margin-bottom: 10px;
    cursor: pointer;
    position: relative;
}

.progress-bar-container:hover {
    height: 6px;
}

.progress-bar-fill {
    height: 100%;
    background-color: #B98751;
    border-radius: 2px;
    width: 0%;
    position: relative;
}

.progress-bar-fill::after {
    content: '';
    position: absolute;
    right: -5px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background-color: #fff;
    border-radius: 50%;
    display: none;
}

.progress-bar-container:hover .progress-bar-fill::after {
    display: block;
}

.controls-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: #fff;
}

.controls-left, .controls-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-control {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    color: #fff;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.btn-control:hover {
    opacity: 1;
}

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

.control-group {
    position: relative;
    cursor: pointer;
    font-size: 14px;
    opacity: 0.9;
}

.control-group:hover {
    opacity: 1;
}

.options-popup {
    display: none;
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0,0,0,0.8);
    border-radius: 4px;
    padding: 5px 0;
    min-width: 60px;
    text-align: center;
}

.control-group:hover .options-popup {
    display: block;
}

.option-item {
    padding: 5px 10px;
    font-size: 12px;
    color: #ccc;
    cursor: pointer;
}

.option-item:hover {
    color: #fff;
    background-color: rgba(255,255,255,0.1);
}

.option-item.active {
    color: #B98751;
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 5px;
}

.volume-slider-container {
    width: 0;
    height: 4px;
    background: rgba(255,255,255,0.3);
    border-radius: 2px;
    transition: width 0.3s;
    overflow: hidden;
}

.volume-control:hover .volume-slider-container {
    width: 60px;
}

.volume-slider-fill {
    height: 100%;
    background-color: #fff;
}

.vjs-poster img {
    object-fit: cover;
}

.video-js .vjs-big-play-button {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    line-height: 60px;
    border: none;
    background-color: rgba(0, 0, 0, 0.6);
}

.video-js .vjs-big-play-button .vjs-icon-placeholder:before {
    font-size: 36px;
    line-height: 60px;
}

.video-js .vjs-control-bar {
    background-color: rgba(0,0,0,0.5);
}

.video-js .vjs-progress-control {
    flex: auto;
}

.video-js .vjs-progress-holder .vjs-play-progress {
    background-color: #B98751;
}

.video-js .vjs-play-progress:before {
    background-color: #fff;
    color: #fff;
    box-shadow: 0 0 5px rgba(0,0,0,0.3);
    transform: scale(0.8);
}

.video-js .vjs-load-progress div {
    background-color: rgba(255, 255, 255, 0.3);
}

.video-js .vjs-current-time,
.video-js .vjs-time-divider,
.video-js .vjs-duration,
.video-js .vjs-playback-rate {
    display: block !important;
}

.video-js .vjs-playback-rate .vjs-playback-rate-value {
    display: flex !important;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    font-size: 1.2em;
    line-height: 3em;
    pointer-events: none;
}

.video-js .vjs-time-control {
    display: block;
    padding-left: 0.5em;
    padding-right: 0.5em;
}

.video-js .vjs-time-control .vjs-current-time-display,
.video-js .vjs-time-control .vjs-duration-display {
    font-size: 1.1em;
    line-height: 3em;
}

.vjs-next-button {
    cursor: pointer;
    width: 3em;
}

.vjs-next-button .vjs-icon-placeholder {
    width: 100%;
    height: 100%;
    display: block;
    background-image: url("data:image/svg+xml,%3Csvg width='24' height='24' viewBox='0 0 24 24' fill='white' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M6 18l8.5-6L6 6v12zM16 6v12h2V6h-2z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 20px;
    opacity: 0.85;
    transition: opacity 0.2s;
}

.vjs-next-button:hover .vjs-icon-placeholder {
    opacity: 1;
}

.vjs-next-button .vjs-icon-placeholder:before {
    display: none;
    content: ''; 
}

.vjs-quality-selector .vjs-menu-button-popup .vjs-menu {
    left: -2em;
}
.vjs-quality-selector .vjs-menu-item.vjs-selected {
    background-color: #B98751;
    color: #fff;
}
.vjs-quality-selector .vjs-icon-placeholder:before {
    content: '高清';
    font-family: inherit;
    font-size: 14px;
    width: auto;
    line-height: 30px;
    top: 0;
}
.vjs-quality-selector {
    width: 4em !important; 
}