/* 下载页面专用样式 */

/* 页面头部 */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.page-header h1 i {
    margin-right: 1rem;
}

.page-header p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.breadcrumb {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
}

.breadcrumb a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
}

.breadcrumb a:hover {
    opacity: 1;
}

.breadcrumb span {
    opacity: 0.6;
}

/* 下载说明 */
.download-info {
    background: var(--bg-white);
    padding: 4rem 0;
}

.info-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: flex-start;
}

.info-text h2 {
    font-size: 2.5rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 700;
}

.info-text p {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
    line-height: 1.6;
}

.doc-types {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.doc-type {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.doc-type i {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-top: 0.2rem;
}

.doc-type h3 {
    color: var(--text-dark);
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.doc-type p {
    color: var(--text-light);
    margin: 0;
    line-height: 1.6;
}

.info-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.stat-item {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    border: 1px solid var(--border-light);
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.stat-number {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-light);
    font-weight: 500;
}

/* 文档筛选区域 */
.download-filter {
    background: var(--bg-light);
    padding: 2rem 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 80px;
    z-index: 100;
}

.filter-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.category-tabs {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: transparent;
    border: 2px solid var(--border-light);
    color: var(--text-dark);
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 0.9rem;
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: 1rem;
    color: var(--text-light);
}

.search-box input {
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border: 2px solid var(--border-light);
    border-radius: 25px;
    width: 250px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(46, 139, 87, 0.1);
}

/* 下载列表 */
.downloads-section {
    background: var(--bg-white);
    padding: 3rem 0;
}

.downloads-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.download-card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: 15px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    overflow: hidden;
}

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

.card-icon {
    background: linear-gradient(135deg, var(--bg-light) 0%, #E8F5E8 100%);
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.card-icon i {
    font-size: 3rem;
    color: var(--primary-color);
    opacity: 0.8;
}

.doc-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.doc-badge.msds {
    background: #e74c3c;
    color: white;
}

.doc-badge.tds {
    background: #3498db;
    color: white;
}

.card-content {
    padding: 2rem;
}

.card-content h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    font-weight: 600;
    line-height: 1.4;
}

.card-description {
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.card-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.card-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
}

.card-meta i {
    color: var(--primary-color);
    width: 16px;
}

.card-actions {
    display: flex;
    gap: 1rem;
}

.card-actions .btn {
    flex: 1;
    padding: 0.8rem 1rem;
    font-size: 0.9rem;
    text-align: center;
}

/* 批量下载 */
.batch-download {
    background: var(--bg-light);
    padding: 3rem;
    border-radius: 15px;
    text-align: center;
    margin-top: 3rem;
}

.batch-download h3 {
    color: var(--text-dark);
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.batch-download p {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.batch-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.batch-option {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem;
    background: var(--bg-white);
    border-radius: 8px;
    border: 2px solid var(--border-light);
    transition: var(--transition);
    cursor: pointer;
}

.batch-option:hover {
    border-color: var(--primary-color);
}

.batch-option input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.batch-option label {
    color: var(--text-dark);
    font-weight: 500;
    cursor: pointer;
    flex: 1;
    text-align: left;
}

.batch-option input[type="checkbox"]:checked + label {
    color: var(--primary-color);
}

/* 技术支持 */
.tech-support {
    background: var(--bg-light);
    padding: 4rem 0;
}

.support-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: center;
}

.support-text h2 {
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 700;
}

.support-text p {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.1rem;
    line-height: 1.6;
}

.support-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.support-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-dark);
}

.support-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
    width: 20px;
}

.support-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* 下载须知 */
.download-notice {
    background: var(--bg-white);
    padding: 4rem 0;
    border-top: 1px solid var(--border-light);
}

.download-notice h3 {
    text-align: center;
    font-size: 2rem;
    color: var(--text-dark);
    margin-bottom: 3rem;
    font-weight: 700;
}

.notice-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.notice-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 12px;
}

.notice-item i {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-top: 0.2rem;
    flex-shrink: 0;
}

.notice-item h4 {
    color: var(--text-dark);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.notice-item p {
    color: var(--text-light);
    line-height: 1.6;
    margin: 0;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-white);
    margin: 2% auto;
    padding: 0;
    border-radius: 15px;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    color: var(--text-light);
    float: right;
    font-size: 2rem;
    font-weight: bold;
    position: absolute;
    right: 1rem;
    top: 1rem;
    z-index: 1;
    cursor: pointer;
    transition: var(--transition);
}

.close:hover,
.close:focus {
    color: var(--text-dark);
}

/* 预览内容样式 */
.preview-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 3rem 2rem 2rem;
    text-align: center;
}

.preview-header h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.preview-content {
    padding: 2rem;
    text-align: center;
}

.preview-placeholder {
    background: var(--bg-light);
    padding: 4rem 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.preview-placeholder i {
    font-size: 4rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.preview-placeholder h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-weight: 600;
}

.preview-placeholder p {
    color: var(--text-light);
    line-height: 1.6;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-header h1 {
        font-size: 2rem;
    }
    
    .info-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .info-stats {
        flex-direction: row;
        justify-content: space-around;
    }
    
    .stat-item {
        flex: 1;
        margin: 0 0.5rem;
        padding: 1.5rem 1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .filter-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .category-tabs {
        justify-content: center;
        gap: 0.5rem;
    }
    
    .tab-btn {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
    }
    
    .search-box input {
        width: 200px;
    }
    
    .downloads-grid {
        grid-template-columns: 1fr;
    }
    
    .card-actions {
        flex-direction: column;
    }
    
    .batch-options {
        grid-template-columns: 1fr;
    }
    
    .support-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .notice-content {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 1% auto;
    }
    
    .preview-header {
        padding: 2rem 1rem 1rem;
    }
    
    .preview-content {
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .page-header {
        padding: 100px 0 60px;
    }
    
    .download-info {
        padding: 3rem 0;
    }
    
    .doc-type {
        padding: 1rem;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .stat-item {
        padding: 1rem;
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .card-content {
        padding: 1.5rem;
    }
    
    .card-content h3 {
        font-size: 1.1rem;
    }
    
    .batch-download {
        padding: 2rem 1.5rem;
    }
    
    .batch-option {
        padding: 0.8rem;
    }
    
    .notice-item {
        padding: 1rem;
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* 隐藏/显示下载卡片 */
.download-card.hidden {
    display: none;
}

/* 加载状态 */
.loading {
    text-align: center;
    padding: 3rem;
    color: var(--text-light);
}

.loading i {
    font-size: 2rem;
    color: var(--primary-color);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 下载进度模态框 */
.download-progress {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-white);
    padding: 3rem 2.5rem;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    z-index: 10001;
    min-width: 400px;
    text-align: center;
}

.download-progress h3 {
    color: var(--text-dark);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.download-progress p {
    color: var(--text-light);
    margin-bottom: 2rem;
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: var(--bg-light);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 1.5rem;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 6px;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

#progressText {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.95rem;
}