/* ==========================================================================
   NKLK 下载中心 —— 前端样式
   存放位置：wp-content/themes/你的子主题/assets/nklk-download.css
   ========================================================================== */

/* ---------- 设计变量（命名空间隔离，不会污染主题） ---------- */
:root {
    --nklk-primary:       #2563eb;
    --nklk-primary-dark:  #1d4ed8;
    --nklk-primary-soft:  rgba(37, 99, 235, .08);
    --nklk-text:          #1f2937;
    --nklk-text-strong:   #111827;
    --nklk-muted:         #6b7280;
    --nklk-faint:         #9ca3af;
    --nklk-border:        #e5e7eb;
    --nklk-bg-soft:       #f8fafc;
    --nklk-radius:        12px;
    --nklk-radius-sm:     10px;
    --nklk-shadow:        0 1px 2px rgba(16,24,40,.05), 0 4px 12px rgba(16,24,40,.05);
    --nklk-shadow-hover:  0 6px 16px rgba(16,24,40,.10), 0 16px 32px rgba(16,24,40,.10);
}

/* 视频封面：播放按钮 */
.nklk-video-cover {
    position: relative;
    overflow: hidden;
}

.nklk-video-cover a {
    display: block;
    position: relative;
}

.nklk-video-cover img {
    display: block;
    width: 100%;
    height: auto;
    transition: opacity .2s;
}

.nklk-video-cover a:hover img {
    opacity: 0.85;
}

/* 居中的播放三角 */
.nklk-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 34px;
    height: 34px;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.55);
    border-radius: 50%;
    transition: background .2s, transform .2s;
    pointer-events: none;
}

.nklk-play-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 54%;
    transform: translate(-50%, -50%);
    border-style: solid;
    border-width: 6px 0 6px 10px;
    border-color: transparent transparent transparent #fff;
}

.nklk-video-cover a:hover .nklk-play-btn {
    background: rgba(0, 0, 0, 0.75);
    transform: translate(-50%, -50%) scale(1.08);
}
.nklk-video-cover a { display: block; }
.nklk-video-cover a:hover img { opacity: 0.85; }
.nklk-video-title a { color: inherit; text-decoration: none; }
.nklk-video-title a:hover { color: #2271b1; }
/* ---------- 容器 ---------- */
.nklk-download-page {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 0 48px;
    color: var(--nklk-text);
    font-size: 15px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.nklk-download-page *,
.nklk-download-page *::before,
.nklk-download-page *::after {
    box-sizing: border-box;
}

/* ---------- 区块标题：视频 / 文档 ---------- */
.nklk-section-title {
    position: relative;
    margin: 40px 0 20px;
    padding-left: 14px;
    font-size: 22px;
    font-weight: 700;
    line-height: 1.4;
    color: var(--nklk-text-strong);
}

.nklk-section-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 1em;
    border-radius: 4px;
    background: linear-gradient(180deg, var(--nklk-primary), #60a5fa);
}

.nklk-section { margin-bottom: 8px; }

/* ==========================================================================
   视频
   ========================================================================== */

/* 分类卡片 */
.nklk-video-cat,
.nklk-doc-cat {
    margin-bottom: 26px;
    padding: 20px 22px;
    background: #fff;
    border: 1px solid var(--nklk-border);
    border-radius: var(--nklk-radius);
    box-shadow: var(--nklk-shadow);
}

.nklk-video-cat-title,
.nklk-doc-cat-title {
    margin: 0 0 18px;
    padding-bottom: 12px;
    font-size: 18px;
    font-weight: 600;
    line-height: 1.4;
    color: var(--nklk-text-strong);
    border-bottom: 1px dashed var(--nklk-border);
}

/* 子分类：左侧竖线缩进，层级一眼可见 */
.nklk-video-child,
.nklk-doc-child {
    margin-bottom: 22px;
    padding-left: 16px;
    border-left: 2px solid var(--nklk-border);
}

.nklk-video-child:last-child,
.nklk-doc-child:last-child { margin-bottom: 0; }

.nklk-video-child-title,
.nklk-doc-child-title {
    position: relative;
    margin: 0 0 12px;
    font-size: 15px;
    font-weight: 600;
    color: #374151;
}

.nklk-video-child-title::before,
.nklk-doc-child-title::before {
    content: "";
    position: absolute;
    left: -22px;
    top: .55em;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--nklk-primary);
    opacity: .55;
}

/* 视频卡片列表 */
.nklk-video-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 14px;
    margin-bottom: 4px;
}

.nklk-video-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--nklk-border);
    border-radius: var(--nklk-radius-sm);
    transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.nklk-video-item:hover {
    transform: translateY(-3px);
    border-color: rgba(37, 99, 235, .35);
    box-shadow: var(--nklk-shadow-hover);
}

/* 封面 */
.nklk-video-cover {
    position: relative;
    flex: 0 0 84px;
    width: 84px;
    height: 84px;
    background: var(--nklk-bg-soft);
}

.nklk-video-cover img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .4s ease;
}

.nklk-video-item:hover .nklk-video-cover img { transform: scale(1.05); }

/* 信息区 */
.nklk-video-info {
    display: flex;
    flex: 1;
    min-width: 0;
    flex-direction: column;
    gap: 4px;
    padding: 10px 12px;
}

.nklk-video-title {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
    margin: 0;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--nklk-text-strong);
}

.nklk-video-intro {
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
    font-size: 13px;
    line-height: 1.6;
    color: var(--nklk-muted);
}

.nklk-video-date {
    margin-top: auto;
    padding-top: 4px;
    font-size: 12px;
    color: var(--nklk-faint);
}

.nklk-video-date::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 6px;
    border-radius: 50%;
    background: var(--nklk-primary);
    opacity: .6;
    vertical-align: middle;
}

/* ==========================================================================
   文档
   ========================================================================== */

.nklk-doc-wrap { margin-bottom: 8px; }

.nklk-doc-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 4px;
}

.nklk-doc-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    background: var(--nklk-bg-soft);
    border: 1px solid transparent;
    border-radius: var(--nklk-radius-sm);
    transition: background .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.nklk-doc-item:hover {
    background: #fff;
    border-color: rgba(37, 99, 235, .3);
    box-shadow: var(--nklk-shadow);
    transform: translateX(3px);
}

/* 文件类型徽标 */
.nklk-doc-type {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: var(--nklk-radius-sm);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .5px;
    color: #fff;
    text-transform: uppercase;
    background: #64748b;
    box-shadow: 0 2px 6px rgba(15, 23, 42, .15);
}

.nklk-doc-type-pdf { background: linear-gradient(135deg, #f87171, #dc2626); }
.nklk-doc-type-ppt { background: linear-gradient(135deg, #fb923c, #ea580c); }
.nklk-doc-type-jpg { background: linear-gradient(135deg, #a78bfa, #7c3aed); }
.nklk-doc-type-doc { background: linear-gradient(135deg, #60a5fa, #1d4ed8); }
.nklk-doc-type-zip { background: linear-gradient(135deg, #38bdf8, #0284c7); }

/* 文档信息 */
.nklk-doc-info {
    flex: 1;
    min-width: 0;
}

.nklk-doc-title {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.5;
    color: var(--nklk-text-strong);
    word-break: break-word;
}

.nklk-doc-title a {
    color: inherit;
    text-decoration: none;
    transition: color .2s ease;
}

.nklk-doc-title a:hover {
    color: var(--nklk-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.nklk-doc-intro {
    margin-top: 4px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--nklk-muted);
}

.nklk-doc-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
}

.nklk-doc-lang,
.nklk-doc-date {
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 12px;
    line-height: 1.7;
    color: #64748b;
    background: #eef2f7;
}

.nklk-doc-lang {
    color: var(--nklk-primary-dark);
    background: var(--nklk-primary-soft);
}

/* ==========================================================================
   空状态
   ========================================================================== */
.nklk-video-empty,
.nklk-doc-empty {
    margin: 0 0 16px;
    padding: 14px 16px;
    font-size: 13px;
    color: var(--nklk-muted);
    background: var(--nklk-bg-soft);
    border: 1px dashed var(--nklk-border);
    border-radius: var(--nklk-radius-sm);
}

/* ==========================================================================
   无障碍 / 焦点
   ========================================================================== */
.nklk-download-page a:focus-visible,
.nklk-doc-wrap a:focus-visible {
    outline: 2px solid var(--nklk-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 782px) {
    .nklk-section-title {
        margin: 28px 0 16px;
        font-size: 19px;
    }

    .nklk-video-cat,
    .nklk-doc-cat {
        padding: 16px 14px;
        border-radius: var(--nklk-radius-sm);
    }

    .nklk-video-list {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .nklk-doc-item {
        gap: 12px;
        padding: 12px;
    }

    .nklk-doc-type {
        width: 44px;
        height: 44px;
        font-size: 11px;
    }

    .nklk-video-child,
    .nklk-doc-child { padding-left: 12px; }

    .nklk-video-child-title::before,
    .nklk-doc-child-title::before { left: -18px; }
}

/* ---------- 深色模式（可选，跟随系统） ---------- */
@media (prefers-color-scheme: dark) {
    :root {
        --nklk-text:        #e5e7eb;
        --nklk-text-strong: #f9fafb;
        --nklk-muted:       #9ca3af;
        --nklk-faint:       #6b7280;
        --nklk-border:      #374151;
        --nklk-bg-soft:     #1f2937;
        --nklk-primary-soft: rgba(96, 165, 250, .12);
    }

    .nklk-video-cat,
    .nklk-doc-cat,
    .nklk-video-item { background: #111827; }

    .nklk-video-item:hover { border-color: rgba(96, 165, 250, .4); }

    .nklk-doc-item:hover { background: #111827; }

    .nklk-doc-lang,
    .nklk-doc-date {
        color: #cbd5e1;
        background: #1f2937;
    }

    .nklk-doc-lang {
        color: #93c5fd;
        background: rgba(96, 165, 250, .12);
    }
}