/* ==================== 全局样式重置 ==================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== 顶部导航栏 ==================== */
.top-navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 20px;
    font-weight: bold;
    color: white;
}

.nav-search {
    flex: 1;
    max-width: 500px;
    position: relative;
}

.nav-search input {
    width: 100%;
    padding: 10px 45px 10px 15px;
    border: none;
    border-radius: 25px;
    font-size: 14px;
    background: rgba(255, 255, 255, 0.95);
    transition: all 0.3s ease;
}

.nav-search input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}

.search-btn {
    position: absolute;
    right: 5px;
    top: 50%;
    transform: translateY(-50%);
    background: #667eea;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.search-btn:hover {
    background: #5a6fd6;
}

.nav-user {
    display: flex;
    gap: 12px;
}

.nav-btn {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.nav-btn-primary {
    background: white;
    color: #667eea;
    border: none;
}

.nav-btn-primary:hover {
    background: #f0f0f0;
}

/* ==================== 分类筛选栏 ==================== */
.filter-section {
    background: white;
    border-bottom: 1px solid #e8e8e8;
    padding: 20px 0;
}

.filter-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.filter-row {
    display: flex;
    align-items: flex-start;
    margin-bottom: 15px;
    gap: 15px;
}

.filter-row:last-child {
    margin-bottom: 0;
}

.filter-label {
    font-size: 14px;
    color: #666;
    font-weight: 500;
    min-width: 50px;
    padding-top: 6px;
}

.filter-options {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    flex: 1;
}

.filter-btn {
    padding: 6px 16px;
    border-radius: 15px;
    font-size: 13px;
    color: #666;
    background: #f5f5f5;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    background: #e8e8e8;
    color: #333;
}

.filter-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* ==================== 主要内容区域 ==================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 30px 20px;
    min-height: 500px;
}

.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 25px;
}

.section-title {
    font-size: 22px;
    font-weight: 600;
    color: #333;
}

.content-count {
    font-size: 14px;
    color: #999;
}

/* ==================== 素材卡片网格 ==================== */
.material-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
}

.material-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

.material-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-image {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    background: #f5f5f5;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.material-card:hover .card-image img {
    transform: scale(1.05);
}

.card-tags {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    gap: 5px;
}

.card-tag {
    padding: 3px 8px;
    border-radius: 3px;
    font-size: 11px;
    font-weight: 500;
}

.tag-exclusive {
    background: #ff6b6b;
    color: white;
}

.tag-copyright {
    background: #4ecdc4;
    color: white;
}

.tag-free {
    background: #95e1d3;
    color: #2d6a4f;
}

.card-info {
    padding: 15px;
}

.card-title {
    font-size: 15px;
    font-weight: 500;
    color: #333;
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: #999;
}

.card-category {
    background: #f0f0f0;
    padding: 2px 8px;
    border-radius: 3px;
}

/* ==================== 分页控件 ==================== */
.pagination-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
    padding: 20px 0;
}

.page-btn,
.page-nav-btn {
    min-width: 36px;
    height: 36px;
    padding: 0 12px;
    border-radius: 6px;
    font-size: 14px;
    color: #666;
    background: white;
    border: 1px solid #e8e8e8;
    transition: all 0.3s ease;
}

.page-btn:hover,
.page-nav-btn:hover:not(:disabled) {
    background: #f5f5f5;
    border-color: #d0d0d0;
}

.page-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: transparent;
}

.page-nav-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.ellipsis {
    color: #999;
    padding: 0 8px;
}

.go-to-page {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 20px;
    font-size: 14px;
    color: #666;
}

.page-input {
    width: 50px;
    height: 36px;
    border: 1px solid #e8e8e8;
    border-radius: 6px;
    text-align: center;
    font-size: 14px;
}

.go-btn {
    padding: 0 15px;
    height: 36px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 6px;
    font-size: 14px;
    transition: opacity 0.3s ease;
}

.go-btn:hover {
    opacity: 0.9;
}

.total-info {
    margin-right: 15px;
    color: #999;
    font-size: 14px;
}

/* ==================== 底部区域 ==================== */
.main-footer {
    background: #2d3748;
    color: #a0aec0;
    padding: 40px 0 0;
    margin-top: 60px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-section h4 {
    color: white;
    font-size: 16px;
    margin-bottom: 20px;
    font-weight: 600;
}

.donation-text {
    font-size: 14px;
    color: #a0aec0;
    margin-bottom: 20px;
    line-height: 1.6;
}

.payment-methods {
    display: flex;
    gap: 20px;
}

.payment-item {
    text-align: center;
}

.payment-item img {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 8px;
    background: white;
    padding: 5px;
}

.payment-item span {
    font-size: 13px;
    color: #a0aec0;
}

.resource-link {
    display: inline-block;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #e2e8f0;
    transition: background 0.3s ease;
}

.resource-link:hover {
    background: rgba(255, 255, 255, 0.2);
}

.footer-bottom {
    border-top: 1px solid #4a5568;
    margin-top: 40px;
    padding: 20px;
    text-align: center;
    font-size: 13px;
}

.footer-bottom a {
    color: #a0aec0;
    text-decoration: none;
}

.footer-bottom a:hover {
    color: white;
}

/* ==================== 素材详情弹窗 ==================== */
.material-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: 16px;
    max-width: 1100px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.1);
    font-size: 24px;
    color: #666;
    z-index: 10;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.2);
    color: #333;
}

.modal-body {
    display: flex;
    height: 100%;
    max-height: 90vh;
}

.modal-gallery {
    flex: 1;
    padding: 30px;
    background: #f8f9fa;
    overflow-y: auto;
}

.main-image-container {
    position: relative;
    background: white;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 20px;
}

.main-image-container img {
    width: 100%;
    height: auto;
    display: block;
}

.image-tags {
    position: absolute;
    top: 15px;
    left: 15px;
    display: flex;
    gap: 8px;
}

.tag {
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.tag-free {
    background: #4ecdc4;
    color: white;
}

.thumbnail-list {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.thumbnail-list img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
}

.thumbnail-list img:hover,
.thumbnail-list img.active {
    border-color: #667eea;
}

.modal-info {
    width: 380px;
    padding: 30px;
    overflow-y: auto;
    border-left: 1px solid #e8e8e8;
}

.modal-title {
    font-size: 22px;
    font-weight: 600;
    color: #333;
    margin-bottom: 15px;
}

.modal-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #e8e8e8;
}

.meta-item {
    font-size: 14px;
    color: #666;
}

.meta-label {
    color: #999;
}

.modal-description {
    margin-bottom: 25px;
}

.modal-description h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.modal-description p {
    font-size: 14px;
    color: #666;
    line-height: 1.8;
}

.modal-actions {
    margin-bottom: 20px;
}

.action-btn {
    width: 100%;
    padding: 14px 20px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-download {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.modal-notice {
    padding: 15px;
    background: #f0fdf4;
    border-radius: 8px;
    font-size: 13px;
    color: #166534;
    border: 1px solid #bbf7d0;
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .modal-body {
        flex-direction: column;
    }
    
    .modal-info {
        width: 100%;
        border-left: none;
        border-top: 1px solid #e8e8e8;
    }
}

@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .nav-search {
        order: 3;
        max-width: 100%;
        flex-basis: 100%;
    }
    
    .filter-row {
        flex-direction: column;
        gap: 10px;
    }
    
    .filter-label {
        padding-top: 0;
    }
    
    .material-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
    
    .modal-content {
        max-height: 95vh;
    }
    
    .modal-gallery,
    .modal-info {
        padding: 20px;
    }
    
    .pagination-container {
        flex-wrap: wrap;
    }
    
    .go-to-page {
        margin-left: 0;
        margin-top: 10px;
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav-logo img {
        height: 30px;
    }
    
    .logo-text {
        font-size: 16px;
    }
    
    .nav-btn {
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .material-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    
    .card-info {
        padding: 10px;
    }
    
    .card-title {
        font-size: 13px;
    }
}

/* ==================== 加载动画 ==================== */
.loading-container {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid #f3f3f3;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    color: #999;
    font-size: 14px;
}

/* ==================== 空状态 ==================== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 80px 20px;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
}

.empty-text {
    font-size: 16px;
    color: #999;
}