/* ============================================================
   下载中心首页 — 卡片网格 + 选项卡筛选
   前缀 dl- 命名空间，rem 统一单位，自适应分辨率与缩放
   ============================================================ */

/* ===== 页面头部（下载模块统一） ===== */
.dl-page-header {
    background: linear-gradient(135deg, #ffffff 0%, #eff6ff 100%);
    border-bottom: 0.0625rem solid #e5e7eb;
    padding: 1.25rem 0 1rem;
}

.dl-page-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 0.25rem;
    color: #0f172a;
}

.dl-page-title i {
    color: #2563eb;
}

.dl-page-subtitle {
    color: #64748b;
    font-size: 0.875rem;
    margin: 0;
}

/* ===== 选项卡导航 ===== */
.dl-tab-bar {
    background: #fff;
    margin-bottom: 1.5rem;
}

.dl-tab-nav {
    display: flex;
    gap: 0.25rem;
    padding: 0.75rem 0;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
}

.dl-tab-btn {
    background: transparent;
    border: 0.0625rem solid transparent;
    color: #334155;
    padding: 0.5rem 1rem;
    border-radius: 62.4375rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    flex-shrink: 0;
    font-family: inherit;
    text-decoration: none;
}

.dl-tab-btn:hover {
    background: #f1f5f9;
    color: #0f172a;
}

.dl-tab-btn.active {
    background: #2563eb;
    color: #fff;
    border-color: #2563eb;
}

.dl-badge-count {
    background: rgba(0,0,0,0.08);
    color: inherit;
    font-size: 0.75rem;
    padding: 0.1rem 0.5rem;
    border-radius: 62.4375rem;
    font-weight: 600;
    min-width: 1.5rem;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.dl-tab-btn.active .dl-badge-count {
    background: rgba(255,255,255,0.25);
    color: #fff;
}

/* ===== 主内容区 ===== */
.dl-main-content {
    padding-bottom: 4rem;
}

/* ===== 分组标题 ===== */
.dl-section-block {
    margin-bottom: 2.5rem;
}

.dl-section-title {
    font-size: 1.05rem;
    font-weight: 600;
    margin: 0 0 1.25rem;
    color: #0f172a;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dl-section-icon {
    color: #2563eb;
}

.dl-section-line {
    flex: 1;
    height: 0.0625rem;
    background: #e5e7eb;
    margin-left: 0.75rem;
}

/* ===== 卡片网格 ===== */
.dl-resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(18.75rem, 1fr));
    gap: 1.25rem;
}

/* ===== 卡片本体 ===== */
.dl-resource-card {
    background: #fff;
    border: 0.0625rem solid #e5e7eb;
    border-radius: 0.75rem;
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0.0625rem 0.1875rem rgba(0,0,0,0.04);
}

.dl-resource-card:hover {
    transform: translateY(-0.125rem);
    box-shadow: 0 0.5rem 1.5rem rgba(0,0,0,0.08);
    border-color: #93c5fd;
}

/* 卡片统一内边距 */
.dl-card-body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex: 1;
}

/* 卡片头部：图标 + 标题 */
.dl-card-head {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
}

.dl-card-icon {
    width: 2.75rem;
    height: 2.75rem;
    border-radius: 0.625rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.35rem;
    flex-shrink: 0;
    overflow: hidden;
}

.dl-card-icon-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 类型图标颜色 — 3 色体系 */
.dl-icon-software { background: #dbeafe; color: #2563eb; }
.dl-icon-sdk { background: #e0e7ff; color: #4f46e5; }
.dl-icon-doc { background: #ccfbf1; color: #0f766e; }
.dl-icon-driver { background: #d1fae5; color: #047857; }
.dl-icon-other { background: #f1f5f9; color: #64748b; }

.dl-card-title-block {
    flex: 1;
    min-width: 0;
}

.dl-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0;
    color: #0f172a;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.dl-card-subtitle {
    font-size: 0.8125rem;
    color: #64748b;
    margin: 0.2rem 0 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* 卡片徽章 */
.dl-card-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.dl-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    padding: 0.15rem 0.5rem;
    border-radius: 0.25rem;
    background: #f8fafc;
    color: #64748b;
    font-weight: 500;
}

.dl-badge-version { background: #eff6ff; color: #2563eb; }
.dl-badge-size { background: #f8fafc; color: #94a3b8; }
.dl-badge-platform { background: #f8fafc; color: #94a3b8; }
.dl-badge-type { background: #f0fdf4; color: #166534; }

/* 卡片描述 */
.dl-card-desc {
    font-size: 0.85rem;
    color: #64748b;
    line-height: 1.6;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* 卡片操作按钮 */
.dl-card-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: auto;
}

.dl-btn-download {
    flex: 1;
    background: #2563eb;
    border: 0.0625rem solid #2563eb;
    color: #fff;
    padding: 0.45rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    text-decoration: none;
}

.dl-btn-download:hover {
    background: #1d4ed8;
    border-color: #1d4ed8;
    color: #fff;
}

.dl-btn-secondary {
    flex: 1;
    background: #fff;
    border: 0.0625rem solid #d1d5db;
    color: #475569;
    padding: 0.45rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    text-decoration: none;
}

.dl-btn-secondary:hover {
    background: #f9fafb;
    border-color: #9ca3af;
    color: #0f172a;
}

/* 卡片底部元信息 */
.dl-card-meta {
    margin-top: 0.25rem;
    padding-top: 0.75rem;
    border-top: 0.0625rem solid #f1f5f9;
    font-size: 0.8rem;
    color: #94a3b8;
    display: flex;
    align-items: center;
}

.dl-card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

/* ===== 空状态 ===== */
.dl-empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #64748b;
}

.dl-empty-state i {
    font-size: 3rem;
    color: #e2e8f0;
    margin-bottom: 1rem;
    display: block;
}

.dl-empty-state p {
    font-size: 0.95rem;
    margin: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 48rem) {
    .dl-page-header {
        padding: 1.5rem 0 1.25rem;
    }
    .dl-page-title {
        font-size: 1.4rem;
    }
    .dl-resource-grid {
        grid-template-columns: 1fr;
    }
    .dl-main-content {
        padding: 1.25rem 0 3rem;
    }
}