/**
 * 主样式文件 - 美化版
 */

/* CSS变量 - 现代化配色 */
:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    
    --text-color: #1f2937;
    --text-light: #6b7280;
    --text-muted: #9ca3af;
    
    --bg-color: #f3f4f6;
    --bg-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-dark: #111827;
    
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --header-height: 70px;
    --sidebar-width: 280px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(16, 185, 129, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(99, 102, 241, 0.05) 0px, transparent 50%);
    background-attachment: fixed;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

/* 按钮样式 - 现代化 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    gap: 8px;
    box-shadow: var(--shadow-sm);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-outline {
    background-color: var(--bg-white);
    border: 2px solid var(--border-color);
    color: var(--text-color);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: rgba(99, 102, 241, 0.05);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

.btn-block {
    width: 100%;
}

/* 表单样式 - 现代化 */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
    font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group select,
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    transition: var(--transition);
    background-color: var(--bg-white);
}

.form-group input:focus,
.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.checkbox-label,
.radio-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.checkbox-label:hover,
.radio-label:hover {
    background-color: var(--bg-light);
}

.checkbox-label input,
.radio-label input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

/* 提示框 - 现代化 */
.alert {
    padding: 16px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert::before {
    font-size: 20px;
}

.alert-success {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    color: #065f46;
    border: 1px solid #6ee7b7;
}

.alert-success::before {
    content: '✓';
}

.alert-error {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #991b1b;
    border: 1px solid #fca5a5;
}

.alert-error::before {
    content: '✕';
}

/* 头部 - 毛玻璃效果 */
.site-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(229, 231, 235, 0.5);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.logo-icon {
    font-size: 28px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: 32px;
}

.main-nav a {
    color: var(--text-light);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    font-size: 15px;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
}

.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 3px 3px 0 0;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-menu {
    position: relative;
}

.user-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 16px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
    background-color: var(--bg-light);
}

.user-link:hover {
    background-color: var(--border-light);
}

.user-avatar-small {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    box-shadow: var(--shadow-sm);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    min-width: 180px;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: var(--transition);
    border: 1px solid var(--border-light);
}

.user-menu:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    color: var(--text-color);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.dropdown-menu a:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
}

.dropdown-menu hr {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 8px 0;
}

/* 移动端菜单 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-lg);
    padding: 20px;
    border-top: 1px solid var(--border-light);
}

.mobile-menu.active {
    display: block;
}

.mobile-menu nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mobile-menu a {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--text-color);
}

.mobile-menu a:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
}

.mobile-menu hr {
    border: none;
    border-top: 1px solid var(--border-light);
    margin: 12px 0;
}

/* 主容器 */
.main-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 32px 24px;
    min-height: calc(100vh - var(--header-height) - 200px);
}

/* 搜索区域 - 渐变背景 */
.search-section {
    margin-bottom: 32px;
}

.search-box {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    padding: 60px 40px;
    border-radius: var(--radius-xl);
    text-align: center;
    color: white;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.search-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 20px 20px;
    opacity: 0.3;
}

.search-box h2 {
    margin-bottom: 28px;
    font-size: 36px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: relative;
}

.search-input-wrapper {
    display: flex;
    max-width: 700px;
    margin: 0 auto;
    gap: 16px;
    position: relative;
}

.search-input-wrapper input {
    flex: 1;
    padding: 18px 28px;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 17px;
    box-shadow: var(--shadow-lg);
    background: rgba(255, 255, 255, 0.95);
}

.search-input-wrapper input:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.3), var(--shadow-lg);
}

.search-input-wrapper input::placeholder {
    color: var(--text-muted);
}

.search-input-wrapper .btn {
    padding: 18px 40px;
    font-size: 17px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #1f2937, #111827);
}

.search-input-wrapper .btn:hover {
    background: linear-gradient(135deg, #111827, #000);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* 内容布局 */
.content-wrapper {
    display: flex;
    gap: 28px;
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
}

.main-content {
    flex: 1;
    min-width: 0;
}

/* 筛选区域 - 卡片样式 */
.filter-section {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.filter-section h3 {
    font-size: 16px;
    margin-bottom: 16px;
    color: var(--text-color);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-list {
    list-style: none;
}

.filter-list li {
    margin-bottom: 6px;
}

.filter-list a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    color: var(--text-light);
    font-size: 14px;
    transition: var(--transition);
}

.filter-list a:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
}

.filter-list li.active a {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

/* 资源列表 */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.section-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-color);
}

.resource-count {
    color: var(--text-muted);
    font-size: 14px;
    background-color: var(--bg-light);
    padding: 6px 14px;
    border-radius: var(--radius-lg);
}

.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.resource-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
}

.resource-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: var(--transition);
}

.resource-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-4px);
}

.resource-card:hover::before {
    opacity: 1;
}

.resource-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: inline-block;
    padding: 12px;
    background: linear-gradient(135deg, var(--bg-light), var(--border-light));
    border-radius: var(--radius-md);
}

.resource-info {
    flex: 1;
}

.resource-title {
    font-size: 17px;
    margin-bottom: 12px;
    line-height: 1.5;
    font-weight: 600;
}

.resource-title a {
    color: var(--text-color);
}

.resource-title a:hover {
    color: var(--primary-color);
}

.resource-desc {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 16px;
    line-height: 1.6;
}

.resource-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.resource-meta span {
    font-size: 12px;
    padding: 6px 12px;
    background: linear-gradient(135deg, var(--bg-light), #fff);
    border-radius: var(--radius-lg);
    color: var(--text-light);
    border: 1px solid var(--border-light);
}

.resource-actions {
    margin-top: auto;
}

.resource-actions .btn {
    width: 100%;
}

/* 分页 - 现代化 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 40px;
}

.page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 44px;
    padding: 0 16px;
    border-radius: var(--radius-md);
    background-color: var(--bg-white);
    color: var(--text-color);
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.page-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.page-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.page-ellipsis {
    color: var(--text-muted);
    padding: 0 8px;
}

/* 热门资源 */
.hot-resources-section,
.latest-resources-section {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 28px;
    margin-top: 32px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.hot-resources-section h3,
.latest-resources-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 700;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.hot-resources-list,
.latest-resources-list {
    list-style: none;
}

.hot-resources-list li,
.latest-resources-list li {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 0;
    border-bottom: 1px solid var(--border-light);
    transition: var(--transition);
}

.hot-resources-list li:hover,
.latest-resources-list li:hover {
    background-color: var(--bg-light);
    margin: 0 -12px;
    padding-left: 12px;
    padding-right: 12px;
    border-radius: var(--radius-md);
}

.hot-resources-list li:last-child,
.latest-resources-list li:last-child {
    border-bottom: none;
}

.hot-resources-list .rank {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-light), var(--border-light));
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 700;
    color: var(--text-light);
}

.hot-resources-list li:first-child .rank {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
    box-shadow: 0 2px 8px rgba(251, 191, 36, 0.4);
}

.hot-resources-list li:nth-child(2) .rank {
    background: linear-gradient(135deg, #9ca3af, #6b7280);
    color: white;
}

.hot-resources-list li:nth-child(3) .rank {
    background: linear-gradient(135deg, #f87171, #ef4444);
    color: white;
}

.hot-resources-list a,
.latest-resources-list a {
    flex: 1;
    color: var(--text-color);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-weight: 500;
}

.hot-resources-list a:hover,
.latest-resources-list a:hover {
    color: var(--primary-color);
}

.hot-resources-list .views,
.latest-resources-list .time {
    font-size: 13px;
    color: var(--text-muted);
    white-space: nowrap;
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-muted);
    background: linear-gradient(135deg, var(--bg-white), var(--bg-light));
    border-radius: var(--radius-lg);
    border: 2px dashed var(--border-color);
}

.empty-state p {
    margin-bottom: 20px;
    font-size: 16px;
}

/* 底部 - 深色主题 */
.site-footer {
    background: linear-gradient(135deg, #1f2937 0%, #111827 100%);
    color: #9ca3af;
    padding: 64px 24px 32px;
    margin-top: 64px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 40px;
}

.footer-section h4 {
    color: white;
    font-size: 17px;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 12px;
}

.footer-section a {
    color: #9ca3af;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
    padding-left: 4px;
}

.footer-bottom {
    max-width: 1400px;
    margin: 40px auto 0;
    padding-top: 32px;
    border-top: 1px solid #374151;
    text-align: center;
}

.footer-bottom p {
    margin-bottom: 8px;
    color: #6b7280;
}

.footer-bottom a {
    color: var(--primary-light);
}

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

/* Toast提示 */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 16px 28px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, #1f2937, #111827);
    color: white;
    font-weight: 500;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 9999;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 10px;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast-success {
    background: linear-gradient(135deg, var(--secondary-color), #059669);
}

.toast-error {
    background: linear-gradient(135deg, var(--danger-color), #dc2626);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .content-wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
    }
    
    .filter-section {
        margin-bottom: 20px;
    }
    
    .filter-list {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .filter-list li {
        margin-bottom: 0;
    }
}

@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .header-actions .user-name {
        display: none;
    }
    
    .search-box {
        padding: 40px 24px;
    }
    
    .search-box h2 {
        font-size: 26px;
    }
    
    .search-input-wrapper {
        flex-direction: column;
    }
    
    .resource-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
    }
    
    .main-container {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }
    
    .search-box {
        padding: 32px 20px;
    }
    
    .search-box h2 {
        font-size: 22px;
    }
}