/* AI工具导航 - 现代化UI样式 */

:root {
    /* 颜色系统 */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;

    --secondary-50: #f8fafc;
    --secondary-100: #f1f5f9;
    --secondary-200: #e2e8f0;
    --secondary-300: #cbd5e1;
    --secondary-400: #94a3b8;
    --secondary-500: #64748b;
    --secondary-600: #475569;
    --secondary-700: #334155;
    --secondary-800: #1e293b;
    --secondary-900: #0f172a;

    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;

    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-brain: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);

    /* 间距系统 */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;

    /* 阴影系统 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* 动画时长 */
    --duration-fast: 0.15s;
    --duration-normal: 0.3s;
    --duration-slow: 0.5s;
    --duration-slower: 0.75s;

    /* 缓动函数 */
    --ease-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* 字体 */
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Monaco', 'Inconsolata', monospace;
}

/* 全局重置 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--secondary-800);
    background: var(--secondary-50);
    overflow-x: hidden;
    font-feature-settings: 'cv11', 'ss01';
    font-variant-ligatures: contextual;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 页面加载器 */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity var(--duration-slow) var(--ease-out), visibility var(--duration-slow) var(--ease-out);
}

.page-loader.hide {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
    color: white;
}

.loader-animation {
    position: relative;
    margin-bottom: var(--space-6);
}

.loader-brain {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    animation: pulse 2s ease-in-out infinite;
}

.loader-dots {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
}

.loader-dots span {
    width: 8px;
    height: 8px;
    background: white;
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite both;
}

.loader-dots span:nth-child(1) { animation-delay: -0.32s; }
.loader-dots span:nth-child(2) { animation-delay: -0.16s; }

.loader-text {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.loader-subtitle {
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 导航栏 */
.navbar {
    background: rgba(248, 250, 252, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.3);
    transition: all var(--duration-normal) var(--ease-out);
    padding: var(--space-3) 0;
}

.navbar.scrolled {
    background: rgba(248, 250, 252, 0.95);
    box-shadow: var(--shadow-lg);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-icon {
    position: relative;
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.logo-pulse {
    position: absolute;
    inset: -4px;
    background: var(--gradient-primary);
    border-radius: 16px;
    opacity: 0.3;
    animation: pulse 2s ease-in-out infinite;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--secondary-900);
    line-height: 1;
}

.brand-tagline {
    font-size: 0.75rem;
    color: var(--secondary-500);
    letter-spacing: 0.5px;
}

/* 搜索组件 */
.search-container {
    position: relative;
    width: 320px;
}

.search-input {
    background: white;
    border: 2px solid var(--secondary-200);
    border-radius: 50px;
    padding: var(--space-3) var(--space-6);
    padding-right: 3.5rem;
    font-size: 0.9rem;
    transition: all var(--duration-normal) var(--ease-out);
    box-shadow: var(--shadow-sm);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
    transform: translateY(-1px);
}

.search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: var(--gradient-primary);
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--duration-normal) var(--ease-out);
}

.search-btn:hover {
    transform: translateY(-50%) scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* Hero区域 */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-primary);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 2px;
    opacity: 0.1;
}

.grid-item {
    background: white;
    animation: fadeInUp 0.6s var(--ease-out) var(--delay) both;
}

.hero-content {
    color: white;
    z-index: 2;
    position: relative;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    padding: var(--space-2) var(--space-4);
    font-size: 0.85rem;
    margin-bottom: var(--space-6);
}

.hero-title {
    font-size: clamp(3rem, 8vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-6);
}

.gradient-text {
    background: linear-gradient(45deg, #ffd700, #ff6b6b, #4ecdc4, #45b7d1);
    background-size: 400% 400%;
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    animation: gradientShift 3s ease-in-out infinite;
}

.hero-description {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: var(--space-8);
    max-width: 600px;
}

.hero-stats {
    display: flex;
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-out);
    overflow: hidden;
    border: 2px solid transparent;
}

.btn-primary {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: rgba(255, 255, 255, 0.25);
}

.btn-explore {
    position: relative;
    overflow: hidden;
}

.btn-shine {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-explore:hover .btn-shine {
    left: 100%;
}

.hero-features {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.feature-tag {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: 0.85rem;
    opacity: 0.8;
}

/* 浮动卡片动画 */
.floating-cards {
    position: absolute;
    inset: 0;
}

.floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: var(--space-3);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.8rem;
    color: white;
    animation: float var(--duration) ease-in-out infinite var(--delay);
}

.floating-card:nth-child(1) { top: 10%; left: 10%; }
.floating-card:nth-child(2) { top: 20%; right: 15%; }
.floating-card:nth-child(3) { top: 50%; left: 5%; }
.floating-card:nth-child(4) { bottom: 30%; right: 10%; }
.floating-card:nth-child(5) { bottom: 10%; left: 20%; }
.floating-card:nth-child(6) { top: 70%; right: 25%; }

/* AI大脑动画 */
.ai-brain {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto;
}

.brain-core {
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
    animation: pulse 3s ease-in-out infinite;
}

.brain-waves {
    position: absolute;
    inset: 0;
}

.wave {
    position: absolute;
    inset: 0;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: wave 2s ease-out infinite;
}

.wave:nth-child(2) { animation-delay: 0.5s; }
.wave:nth-child(3) { animation-delay: 1s; }

/* 动画定义 */
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

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

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes wave {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .search-container {
        width: 100%;
        max-width: 280px;
    }
    
    .hero-stats {
        justify-content: center;
        text-align: center;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .floating-card {
        display: none;
    }
    
    .ai-brain {
        width: 150px;
        height: 150px;
    }
    
    .brain-core {
        font-size: 3rem;
    }
}

/* ==========================================================================
   工具卡片样式 - 基于ai-bot.cn设计风格
   ========================================================================== */

/* 工具卡片容器 */
.tool-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-radius: 16px;
    border: 1px solid rgba(226, 232, 240, 0.5);
    padding: 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-300);
    background: rgba(255, 255, 255, 0.95);
}

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

/* 工具头部 */
.tool-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.tool-logo {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    overflow: hidden;
    background: var(--secondary-100);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    position: relative;
}

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

.tool-logo .tool-icon {
    font-size: 24px;
    color: var(--primary-600);
}

.tool-card:hover .tool-logo img {
    transform: scale(1.1);
}

.tool-info {
    flex: 1;
    min-width: 0;
}

.tool-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--secondary-800);
    margin: 0 0 4px 0;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.tool-category {
    font-size: 13px;
    color: var(--secondary-600);
    background: var(--primary-50);
    color: var(--primary-700);
    padding: 2px 8px;
    border-radius: 6px;
    display: inline-block;
    font-weight: 500;
}

/* 工具描述 */
.tool-description {
    color: var(--secondary-600);
    font-size: 14px;
    line-height: 1.5;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

/* 工具标签 */
.tool-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.tool-tag {
    font-size: 12px;
    color: var(--secondary-500);
    background: var(--secondary-100);
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.tool-tag:hover {
    background: var(--primary-100);
    color: var(--primary-700);
}

/* 工具底部 */
.tool-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid rgba(226, 232, 240, 0.5);
}

.tool-pricing {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pricing-free {
    color: var(--success);
}

.pricing-freemium {
    color: var(--warning);
}

.pricing-paid {
    color: var(--error);
}

.pricing-unknown {
    color: var(--secondary-500);
}

.tool-stats {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--secondary-500);
}

.tool-stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

.tool-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border: none;
    cursor: pointer;
}

.tool-btn-primary {
    background: var(--gradient-primary);
    color: white;
}

.tool-btn-primary:hover {
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.tool-btn-secondary {
    background: transparent;
    color: var(--secondary-600);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

.tool-btn-secondary:hover {
    color: var(--primary-600);
    border-color: var(--primary-300);
    background: var(--primary-50);
}

/* 特色工具标记 */
.tool-card.featured {
    border: 2px solid var(--primary-200);
    background: linear-gradient(135deg, var(--primary-50) 0%, rgba(255, 255, 255, 0.9) 100%);
}

.tool-card.featured::before {
    opacity: 1;
    height: 4px;
    background: var(--gradient-primary);
}

.featured-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--gradient-primary);
    color: white;
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 快速搜索样式 */
.quick-search-section {
    padding: 60px 0;
    background: var(--secondary-100);
}

.quick-search-container {
    text-align: center;
}

.search-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 32px;
}

.search-tag {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    color: var(--secondary-800);
    padding: 12px 20px;
    border-radius: 24px;
    border: 1px solid rgba(226, 232, 240, 0.5);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.search-tag:hover {
    background: var(--primary-600);
    color: white;
    border-color: var(--primary-600);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* 分类卡片样式 */
.category-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(226, 232, 240, 0.5);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    color: white;
}

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

.category-icon {
    font-size: 48px;
    margin-bottom: 16px;
    transition: transform 0.3s ease;
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-name {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--secondary-800);
    transition: color 0.3s ease;
}

.category-card:hover .category-name {
    color: white;
}

.category-description {
    font-size: 14px;
    color: var(--secondary-600);
    margin-bottom: 16px;
    line-height: 1.5;
    transition: color 0.3s ease;
}

.category-card:hover .category-description {
    color: rgba(255, 255, 255, 0.9);
}

.category-count {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-600);
    background: var(--primary-100);
    padding: 6px 12px;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.category-card:hover .category-count {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* 新闻卡片样式 */
.news-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(226, 232, 240, 0.5);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
}

.news-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-300);
}

.news-image {
    position: relative;
    overflow: hidden;
    height: 200px;
    background: var(--secondary-200);
}

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

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

.news-category {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.news-content {
    padding: 24px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--secondary-800);
    margin-bottom: 12px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-excerpt {
    color: var(--secondary-600);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--secondary-500);
}

.news-date {
    display: flex;
    align-items: center;
    gap: 4px;
}

.news-views {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 通用组件样式 */
.section-header {
    margin-bottom: 48px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-800);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.section-title i {
    color: var(--primary-600);
}

.section-description {
    font-size: 1.1rem;
    color: var(--secondary-600);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.loading-spinner {
    padding: 60px 0;
}

.spinner-border {
    color: var(--primary-600);
}

/* 响应式优化 */
@media (max-width: 768px) {
    .tool-card {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .tool-logo {
        width: 40px;
        height: 40px;
    }
    
    .tool-title {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 2rem;
        flex-direction: column;
        gap: 8px;
    }
    
    .search-tags {
        justify-content: flex-start;
    }
    
    .category-card {
        padding: 24px 20px;
    }
    
    .news-image {
        height: 160px;
    }
}