/* =========================================
   Download 页面独立样式 (Style.css - 终极修复版)
   ========================================= */

/* 1. 定义旋转动画 (用于 RGB 边框) */
@keyframes spin-border {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* 2. 全局变量 (RGB 流光配色方案) */
:root {
    /* ☀️ 白天：莫兰迪极光 */
    --border-bg: conic-gradient(
        #ff9a9e, #a18cd1, #fad0c4, #8fd3f4, #fbc2eb, #ff9a9e
    );
}

[data-theme="dark"] {
    /* 🌙 黑夜：赛博朋克霓虹 */
    --border-bg: conic-gradient(
        #ff0055, #ff00cc, #0099ff, #00ffcc, #ccff00, #ff0055
    );
}

/* 3. 布局调整 */
html {
    scrollbar-gutter: stable; /* 强制预留滚动槽 */
}

body { 
    padding-top: 100px; 
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-image: radial-gradient(var(--shadow-color) 1px, transparent 1px);
    background-size: 20px 20px;
    overflow-y: auto; 
}

body.lock-scroll {
    overflow: hidden !important;
}

.download-container {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    flex: 1;
    padding: 0 20px;
}

.page-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

/* 导航栏层级修正 */
header {
    z-index: 3000 !important; 
    position: fixed; 
}

/* =========================================
   筛选工具栏
   ========================================= */
.filter-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px dashed rgba(0,0,0,0.1);
}

.filter-btn {
    background: transparent;
    border: 1px solid var(--accent-green);
    color: var(--text-color);
    padding: 6px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s;
    font-family: inherit;
    margin-right: 5px;
}

.filter-btn:hover { background: rgba(180, 228, 218, 0.2); }

.filter-btn.active {
    background: var(--accent-green);
    color: white;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(180, 228, 218, 0.4);
}

/* ----------------------------------------------------
   ✅ 重点修复区域：滑动排序开关 (强制颜色对比度)
   ---------------------------------------------------- */
.sort-switch {
    position: relative;
    display: flex;
    align-items: center;
    background-color: var(--card-bg);
    border: 1px solid var(--accent-green);
    border-radius: 20px;
    padding: 4px;
    cursor: pointer;
    user-select: none;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
    height: 40px;
    width: 200px;
}

/* 选项文字 (默认状态) */
.sort-switch .switch-opt {
    flex: 1;
    text-align: center;
    font-size: 0.9rem;
    z-index: 5; /* 必须高于滑块 */
    transition: color 0.2s ease;
    font-weight: bold;
    
    /* ☀️ 白天未选中：深灰色 (不透明) */
    color: #666666 !important; 
    opacity: 1 !important;
}

/* 激活状态 (选中) */
.sort-switch .switch-opt.active {
    /* ☀️ 白天选中：纯白色 (背景是绿色) */
    color: #ffffff !important; 
}

/* 滑动色块 */
.switch-slider {
    position: absolute;
    top: 4px;
    left: 4px;
    width: calc(50% - 4px);
    height: calc(100% - 8px);
    background-color: var(--accent-green);
    border-radius: 16px;
    z-index: 1;
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.sort-switch[data-val="oldest"] .switch-slider {
    transform: translateX(calc(100% + 2px)); 
}

/* --- 🌙 黑夜模式颜色强制适配 --- */

/* 黑夜未选中 */
[data-theme="dark"] .sort-switch .switch-opt {
    /* 亮灰色，背景是深蓝卡片色 */
    color: #cccccc !important; 
}

/* 黑夜选中 */
[data-theme="dark"] .sort-switch .switch-opt.active {
    /* 纯黑色，背景是高亮荧光绿，对比度最高 */
    color: #000000 !important; 
}
/* ---------------------------------------------------- */


/* =========================================
   资源网格 (Grid & Cards)
   ========================================= */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.resource-card.is-hidden {
    opacity: 0 !important;
    visibility: hidden !important;
}

.resource-card {
    background: var(--card-bg);
    border: 2px solid var(--bg-color);
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), box-shadow 0.3s;
    cursor: pointer; 
}

.resource-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
    border-color: var(--accent-green);
}

.resource-card:active {
    transform: translateY(-4px) scale(0.98);
    transition: 0.1s;
}

[data-theme="dark"] .resource-card:hover {
    box-shadow: 0 0 20px rgba(0, 224, 198, 0.15);
}

.card-preview {
    width: 100%;
    aspect-ratio: 16/9;
    background: #f0f0f0;
    overflow: hidden;
    border-bottom: 1px solid rgba(0,0,0,0.05);
}

.card-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.resource-card:hover .card-preview img { transform: scale(1.05); }

.card-body {
    padding: 20px;
    flex: 1;
    text-align: left;
}

.card-body h3 {
    margin-bottom: 5px;
    font-size: 1.3rem;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.date-tag {
    font-size: 0.8rem;
    color: var(--accent-green);
    margin-bottom: 8px;
    font-weight: bold;
}

.card-body .note {
    font-size: 0.95rem;
    color: #888;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    padding: 15px 20px;
    background: rgba(0,0,0,0.02);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(0,0,0,0.05);
}

.file-info { font-size: 0.85rem; color: #aaa; font-weight: bold; }

.btn-mini {
    display: inline-block;
    padding: 6px 15px;
    background-color: var(--accent-green);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    font-family: 'ZCOOL KuaiLe', cursive;
    transition: background 0.3s;
    text-decoration: none;
    pointer-events: none; 
}

.btn-mini:hover { background-color: #8ed6c7; }
[data-theme="dark"] .btn-mini { color: #1a1b26; font-weight: bold; }

/* =========================================
   ⭐ 展开后的详情卡片 (Resource Overlay - RGB流光版)
   ========================================= */
.resource-overlay {
    position: fixed;
    z-index: 2000; 
    padding: 3px; 
    background: transparent; 
    border-radius: 20px;
    box-shadow: 0 30px 100px rgba(0,0,0,0.6);
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    display: grid;
    grid-template-columns: 45% 55%; 
    transform-origin: top left; 
    transition: 
        top 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
        left 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
        width 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
        height 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
        opacity 0.3s ease,
        border-radius 0.3s ease;
    will-change: top, left, width, height;
}

/* RGB 流光层 */
.resource-overlay::before {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    width: 200%; height: 200%; 
    background: var(--border-bg);
    z-index: -2; 
    animation: spin-border 4s linear infinite; 
}

/* 纯色遮罩层 */
.resource-overlay::after {
    content: '';
    position: absolute;
    inset: 3px; 
    background: var(--card-bg);
    border-radius: 17px;
    z-index: -1;
}

.resource-overlay.active { opacity: 1; pointer-events: auto; border: none; }

.resource-overlay.closing {
    opacity: 1;
    pointer-events: none;
    transition: 
        top 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        left 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        width 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        height 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        opacity 0.1s 0.35s ease;
}

.resource-overlay.fading-out {
    opacity: 0 !important;
    transition: opacity 0.3s ease !important;
}

.overlay-preview {
    width: 100%;
    height: 100%;
    background: #f0f0f0;
    overflow: hidden;
    position: relative;
    border-top-left-radius: 17px;
    border-bottom-left-radius: 17px;
    z-index: 1;
}

.overlay-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover; 
}

.overlay-content {
    padding: 40px;
    display: flex;
    flex-direction: column;
    overflow-y: auto; 
    position: relative;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    border-top-right-radius: 17px;
    border-bottom-right-radius: 17px;
    z-index: 1;
}

.resource-overlay.active .overlay-content {
    opacity: 1;
    transform: translateY(0);
    transition-delay: 0.2s; 
}

.resource-overlay.closing .overlay-content {
    opacity: 0;
    transition: none; 
}

.close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(0,0,0,0.05);
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    z-index: 10;
}
.close-btn:hover { background: #e25555; color: white; transform: rotate(90deg); }

.overlay-content h2 {
    font-size: 2rem;
    margin-bottom: 10px;
    color: var(--text-color);
}
.overlay-content .meta {
    margin-bottom: 20px;
    font-size: 0.9rem;
    color: #999;
}
.overlay-content .desc {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 40px;
    white-space: pre-wrap;
}

.btn-large {
    display: block;
    width: 100%;
    padding: 15px;
    background: var(--accent-green);
    color: white;
    text-align: center;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: bold;
    text-decoration: none;
    margin-top: auto; 
    box-shadow: 0 5px 15px rgba(180, 228, 218, 0.4);
    transition: transform 0.2s;
}
.btn-large:hover { transform: scale(1.02); background: #8ed6c7; }

/* 遮罩背景 */
.overlay-backdrop {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    z-index: 1004;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}
.overlay-backdrop.active { opacity: 1; pointer-events: auto; }

/* 动画 */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.animate-in { animation: fadeIn 0.4s ease forwards; }

.back-link { display: inline-block; margin: 40px 0; font-size: 1.1rem; color: var(--text-color); border-bottom: 2px dashed var(--accent-pink); transition: all 0.3s; }
.back-link:hover { color: var(--accent-pink); border-bottom-style: solid; }
.preload * { transition: none !important; }

/* =========================================
   移动端适配
   ========================================= */
@media screen and (max-width: 768px) {
    body { padding-top: 140px; }
    header { top: 0; width: 100%; border-radius: 0 0 20px 20px; flex-direction: column; padding: 15px; gap: 10px; }
    .logo { align-self: flex-start; font-size: 1.4rem; }
    nav ul { width: 100%; padding-left: 5px; justify-content: flex-start; }
    .theme-btn { position: absolute; top: 15px; right: 15px; }
    .download-container { padding: 0 10px; }
    
    .filter-bar { justify-content: center; gap: 10px; }
    .category-group { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
    .filter-btn { font-size: 0.85rem; padding: 5px 12px; }
    .sort-switch { width: 100%; max-width: 280px; }

    .resource-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .resource-card { border-radius: 12px; }
    .card-preview { aspect-ratio: 1/1; }
    .card-body { padding: 10px; }
    .card-body h3 { font-size: 1rem; }
    .date-tag { font-size: 0.7rem; margin-bottom: 4px; }
    .card-body .note { font-size: 0.8rem; -webkit-line-clamp: 2; line-clamp: 2; margin-bottom: 0; }
    .card-footer { padding: 8px 10px; flex-direction: column; gap: 5px; align-items: stretch; }
    .file-info { font-size: 0.75rem; text-align: center; }
    
    /* 修复箭头大小，避免在手机上太大 */
    .card-footer span:last-child { font-size: 1.2rem !important; text-align: center; } 

    /* ✅ 修复 3：展开卡片手机布局优化 */
    .resource-overlay {
        grid-template-columns: 1fr;
        /* 改为比例布局：图片占 35%，内容占剩下 */
        grid-template-rows: 35% 1fr; 
    }
    
    .overlay-content { 
        padding: 20px; 
    }
    
    .overlay-content h2 { font-size: 1.4rem; }
    .overlay-content .desc { font-size: 1rem; }
    
    .close-btn { top: 10px; right: 10px; width: 32px; height: 32px; background: rgba(255,255,255,0.9); color: black; font-size: 1.2rem; }

    .overlay-preview {
        border-radius: 17px 17px 0 0;
    }
    .overlay-content {
        border-radius: 0 0 17px 17px;
    }
}

/* =========================================
   终极链接样式修复 (Link Visibility)
   ========================================= */
.overlay-content .desc a {
    color: var(--accent-pink) !important; /* 强制粉色 */
    text-decoration: underline !important;
    font-weight: bold;
    cursor: pointer;
    position: relative;
    z-index: 10; /* 确保在最上层 */
    pointer-events: auto !important; /* 强制可点击 */
}

.overlay-content .desc a:hover {
    color: var(--accent-green) !important;
    text-decoration: none !important;
}