/**
 * 自定义样式 - 增强用户体验
 * 为工具导航网站提供现代化的UI设计
 */

/* ===== 全局样式 ===== */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --border-color: #e9ecef;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --text-primary: #ecf0f1;
    --text-secondary: #bdc3c7;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --border-color: #404040;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* ===== 工具卡片样式 ===== */
.url-card {
    margin-bottom: 1.5rem;
    transition: var(--transition);
}

.url-card:hover {
    transform: translateY(-5px);
}

.url-body {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition);
}

.url-body:hover {
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.url-body .card {
    text-decoration: none;
    color: inherit;
    border: none;
    transition: var(--transition);
}

.url-body .card:hover {
    background-color: var(--bg-secondary);
}

.url-content {
    padding: 1rem;
}

.url-img {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 8px;
    flex-shrink: 0;
}

.url-img img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    border-radius: 6px;
}

.url-info {
    min-width: 0;
}

.url-info strong {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.url-info p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
}

.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.tool-tags .badge {
    font-size: 0.7rem;
    padding: 0.25rem 0.5rem;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.togo {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    transition: var(--transition);
}

.url-body:hover .togo {
    opacity: 1;
}

.togo:hover {
    background: var(--primary-color);
    color: white;
}

/* ===== 分类标题样式 ===== */
.category-title {
    position: relative;
    margin: 2rem 0 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
}

.category-title h2 {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.5rem;
    margin: 0;
}

.category-title::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

/* ===== 搜索框样式 ===== */
.search-container {
    position: relative;
    margin-bottom: 2rem;
}

.search-input {
    width: 100%;
    padding: 1rem 1.5rem 1rem 3rem;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-light);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

/* ===== 导航栏样式 ===== */
.navbar {
    background: var(--bg-primary) !important;
    box-shadow: var(--shadow-light);
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-weight: 700;
    color: var(--text-primary) !important;
    font-size: 1.25rem;
}

.navbar-nav .nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: var(--transition);
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-color) !important;
    background: var(--bg-secondary);
}

/* ===== 主题切换器样式 ===== */
.theme-switcher {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition);
    cursor: pointer;
}

.theme-switcher:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: rotate(15deg);
}

/* ===== 响应式布局 ===== */
@media (max-width: 576px) {
    .url-card {
        margin-bottom: 1rem;
    }
    
    .url-content {
        padding: 0.75rem;
    }
    
    .url-img {
        width: 40px;
        height: 40px;
        padding: 6px;
    }
    
    .url-img img {
        width: 28px;
        height: 28px;
    }
    
    .search-input {
        padding: 0.75rem 1rem 0.75rem 2.5rem;
        font-size: 0.9rem;
    }
    
    .search-icon {
        left: 1rem;
    }
}

@media (min-width: 1200px) {
    .col-xl-5a {
        flex: 0 0 20%;
        max-width: 20%;
    }
}

@media (min-width: 1400px) {
    .col-xxl-6a {
        flex: 0 0 16.666667%;
        max-width: 16.666667%;
    }
}

/* ===== 动画效果 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.url-card {
    animation: fadeInUp 0.5s ease forwards;
}

.url-card:nth-child(odd) {
    animation-delay: 0.1s;
}

.url-card:nth-child(even) {
    animation-delay: 0.2s;
}

/* ===== 加载状态 ===== */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--border-color);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ===== 工具提示样式 ===== */
.tooltip {
    font-size: 0.8rem;
}

.tooltip-inner {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
}

/* ===== 徽章样式 ===== */
.badge-success {
    background: linear-gradient(135deg, var(--secondary-color), #27ae60);
    color: white;
}

.badge-warning {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    color: white;
}

.badge-light {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* ===== 滚动条样式 ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ===== 无障碍访问改进 ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 焦点样式 */
a:focus,
button:focus,
input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #333333;
        --border-color: #000000;
    }
    
    [data-theme="dark"] {
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --border-color: #ffffff;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== AI智能工具特殊样式 ===== */
.ai-tool-card {
    position: relative;
    border-left: 4px solid #3498db;
}

.ai-tool-card .url-img {
    background: linear-gradient(135deg, #3498db, #9b59b6);
}

.ai-tool-card .url-img i {
    color: white;
}

.ai-tool-card::before {
    content: '🤖';
    position: absolute;
    top: -8px;
    right: -8px;
    background: linear-gradient(135deg, #3498db, #9b59b6);
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    box-shadow: 0 2px 8px rgba(52, 152, 219, 0.3);
}

/* 开发工具特殊样式 */
.dev-tool-card {
    border-left: 4px solid #2ecc71;
}

.dev-tool-card .url-img {
    background: linear-gradient(135deg, #2ecc71, #3498db);
}

.dev-tool-card::before {
    content: '💻';
    background: linear-gradient(135deg, #2ecc71, #3498db);
}

/* 设计工具特殊样式 */
.design-tool-card {
    border-left: 4px solid #e74c3c;
}

.design-tool-card .url-img {
    background: linear-gradient(135deg, #e74c3c, #e67e22);
}

.design-tool-card::before {
    content: '🎨';
    background: linear-gradient(135deg, #e74c3c, #e67e22);
}

/* 效率工具特殊样式 */
.productivity-tool-card {
    border-left: 4px solid #f39c12;
}

.productivity-tool-card .url-img {
    background: linear-gradient(135deg, #f39c12, #d35400);
}

.productivity-tool-card::before {
    content: '⚡';
    background: linear-gradient(135deg, #f39c12, #d35400);
}

/* 分类标题图标样式 */
.site-tag {
    color: var(--primary-color);
    font-size: 1.25rem;
}

/* 搜索建议样式 */
.search-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-medium);
    z-index: 1000;
    max-height: 300px;
    overflow-y: auto;
    display: none;
}

.suggestion-item {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.suggestion-item:hover {
    background: var(--bg-secondary);
}

.suggestion-item:last-child {
    border-bottom: none;
}

.suggestion-item i {
    width: 20px;
    color: var(--primary-color);
}

.suggestion-item small {
    margin-left: auto;
    opacity: 0.7;
}

/* 空状态样式 */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h4 {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .ai-tool-card::before,
    .dev-tool-card::before,
    .design-tool-card::before,
    .productivity-tool-card::before {
        display: none;
    }
    
    .url-card {
        border-left-width: 3px;
    }
}