/* ========================================
   学习中心样式
   ======================================== */

/* ------- 搜索框样式 ------- */
.guide-search-box {
    background-color: var(--bg-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.guide-search-box .search-form .input-group {
    position: relative;
}

.guide-search-box .form-control {
    height: 50px;
    font-size: var(--font-size-base);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 0 120px 0 25px;
    transition: var(--transition-normal);
}

.guide-search-box .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem var(--primary-alpha-20);
}

.guide-search-box .btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    height: 40px;
    padding: 0 30px;
    border-radius: calc(var(--radius-lg) - 4px);
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    font-size: var(--font-size-sm);
    transition: var(--transition-normal);
}

.guide-search-box .btn:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.search-suggestion {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.search-suggestion .tag-link {
    display: inline-block;
    padding: 5px 15px;
    background-color: var(--bg-hover);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.search-suggestion .tag-link:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

/* ------- 分类导航样式 ------- */
.guide-nav-wrapper {
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1rem;
}

.guide-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.guide-nav li a {
    display: block;
    padding: 10px 25px;
    color: var(--text-secondary);
    background-color: var(--bg-light);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    transition: var(--transition-normal);
}

.guide-nav li.active a,
.guide-nav li a:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}

/* ------- 视频卡片样式 ------- */
.guide-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.guide-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.guide-card-thumb {
    position: relative;
    overflow: hidden;
    padding-bottom: 56.25%; /* 16:9 比例 */
}

.guide-card-thumb img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.guide-card:hover .guide-card-thumb img {
    transform: scale(1.1);
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-normal);
}

.guide-card:hover .play-overlay {
    opacity: 1;
}

.play-overlay i {
    font-size: 48px;
    color: var(--text-white);
    background-color: var(--primary-color);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.play-overlay i::before{
    transform: translateX(8%);
}

.play-overlay:hover i {
    transform: scale(1.1);
    background-color: var(--primary-hover);
}

.category-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    background-color: var(--primary-color);
    color: var(--text-white);
    padding: 5px 15px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.guide-card-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.guide-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.guide-title a {
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.guide-title a:hover {
    color: var(--primary-color);
}

.guide-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    margin-bottom: 1rem;
    flex: 1;
}

.guide-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.guide-tags .tag {
    display: inline-block;
    padding: 3px 10px;
    background-color: var(--bg-hover);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
}

/* ------- 无结果提示 ------- */
.no-results {
    padding: 3rem 0;
}

.no-results h3 {
    color: var(--text-primary);
    font-size: var(--font-size-2xl);
}

.result-count {
    font-size: var(--font-size-sm);
}

.result-count span {
    color: var(--primary-color);
    font-weight: 600;
}

/* ------- 详情页视频播放器 ------- */
.video-player-wrapper {
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 比例 */
    background-color: #000;
}

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

.video-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-normal);
    z-index: 10;
}

.video-play-btn:hover {
    background-color: var(--primary-hover);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-play-btn i {
    font-size: 36px;
    color: var(--text-white);
    margin-left: 5px;
}

.video-play-btn.playing {
    display: none;
}

.video-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 20;
}

.video-info {
    padding: 2rem;
}

.video-title {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.video-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.video-meta {
    display: flex;
    gap: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-light);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.meta-item i {
    font-size: 18px;
    color: var(--primary-color);
}

.download-link {
    color: var(--primary-color);
    font-weight: 500;
}

.download-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.video-tags .tag-link {
    display: inline-block;
    padding: 5px 15px;
    background-color: var(--bg-section);
    color: var(--text-secondary);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.video-tags .tag-link:hover {
    background-color: var(--primary-color);
    color: var(--text-white);
}


/* ------- 响应式样式 ------- */
@media (max-width: 991.98px) {
    .guide-nav {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 0.5rem;
    }

    .guide-nav li {
        flex-shrink: 0;
    }

    .video-sidebar {
        position: static;
        margin-top: 3rem;
    }
}

@media (max-width: 767.98px) {
    .guide-search-box {
        padding: 1.5rem;
    }

    .guide-search-box .form-control {
        font-size: var(--font-size-sm);
    }

    .guide-nav li a {
        padding: 8px 20px;
        font-size: var(--font-size-sm);
    }

    .video-info {
        padding: 1.5rem;
    }

    .video-title {
        font-size: var(--font-size-xl);
    }

    .video-meta {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 575.98px) {
    .search-suggestion {
        font-size: var(--font-size-xs);
    }

    .guide-card-content {
        padding: 1rem;
    }

    .guide-title {
        font-size: var(--font-size-base);
    }

    .guide-desc {
        font-size: var(--font-size-xs);
    }
}