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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #667eea;
}

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

.cpu-link, .gpu-link {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.cpu-link:hover, .gpu-link:hover {
    transform: translateY(-2px);
}

/* 主要内容区域 */
.main-content {
    padding: 2rem 0;
}

.hero-section {
    text-align: center;
    margin-bottom: 3rem;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 1.5rem;
}

.update-time {
    font-size: 0.9rem;
    color: #888;
}

/* 分类导航 */
.category-nav {
    margin-bottom: 2rem;
}

.category-nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 1rem;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    flex-wrap: wrap;
    gap: 0.5rem;
}

.category-nav .nav-link {
    padding: 0.75rem 1.5rem;
    color: #666;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.category-nav .nav-link:hover,
.category-nav .nav-link.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    transform: translateY(-2px);
}

/* 内存区域样式 */
.memory-section {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.memory-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #333;
    text-align: center;
}

/* 筛选控件 */
.filter-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.filter-controls select {
    padding: 0.75rem 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    background: white;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-controls select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.search-box input {
    padding: 0.75rem 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 0.9rem;
    width: 250px;
    transition: all 0.3s ease;
}

.search-box input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* 内存表格样式 */
.memory-table-container {
    overflow-x: auto;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.memory-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 15px;
    overflow: hidden;
}

.memory-table th {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
}

.memory-table td {
    padding: 1rem;
    border-bottom: 1px solid #f0f0f0;
    font-size: 0.9rem;
}

.memory-table tr:hover {
    background-color: #f8f9ff;
}

.memory-table tr:last-child td {
    border-bottom: none;
}

/* 排名样式 */
.rank {
    font-weight: bold;
    padding: 0.25rem 0.5rem;
    border-radius: 15px;
    background: #f0f0f0;
    color: #666;
}

.rank.top-3 {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #b8860b;
}

/* 品牌样式 */
.brand-samsung { color: #1f4e79; font-weight: bold; }
.brand-hynix { color: #e74c3c; font-weight: bold; }
.brand-micron { color: #2ecc71; font-weight: bold; }
.brand-corsair { color: #f39c12; font-weight: bold; }
.brand-gskill { color: #9b59b6; font-weight: bold; }
.brand-kingston { color: #34495e; font-weight: bold; }

/* 性能分数样式 */
.performance-score {
    font-weight: bold;
    color: #667eea;
}

/* 价格样式 */
.price-high { color: #e74c3c; font-weight: bold; }
.price-mid { color: #f39c12; font-weight: bold; }
.price-low { color: #27ae60; font-weight: bold; }

/* 相关链接区域 */
.related-links {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.related-links h3 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    color: #333;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.link-card {
    background: white;
    padding: 1.5rem;
    border-radius: 15px;
    text-decoration: none;
    color: #333;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.link-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.link-card h4 {
    color: #667eea;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.link-card p {
    color: #666;
    font-size: 0.9rem;
}

/* 尾部样式 */
.footer {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    margin-top: 3rem;
    padding: 3rem 0 1rem;
}

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

.footer-section h4 {
    color: #333;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #667eea;
}

.footer-bottom {
    border-top: 1px solid #e1e5e9;
    padding-top: 2rem;
    text-align: center;
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    color: #666;
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #667eea;
}

.separator {
    color: #ccc;
    margin: 0 0.5rem;
}

.footer-bottom p {
    color: #888;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .category-nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    .filter-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .search-box input {
        width: 100%;
    }
    
    .memory-table {
        font-size: 0.8rem;
    }
    
    .memory-table th,
    .memory-table td {
        padding: 0.5rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
}

/* 加载动画 */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 3rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* 知识百科页面样式 */
.knowledge-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.knowledge-content {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

.knowledge-sidebar {
    flex: 0 0 280px;
    position: sticky;
    top: 100px;
    height: fit-content;
}

.knowledge-nav {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.knowledge-nav h3 {
    color: #2c3e50;
    font-size: 1.3rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #667eea;
    text-align: center;
}

.knowledge-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.knowledge-nav li {
    margin-bottom: 8px;
}

.knowledge-nav .nav-item {
    display: block;
    padding: 12px 15px;
    color: #555;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
    border-left: 3px solid transparent;
}

.knowledge-nav .nav-item:hover {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    color: #667eea;
    border-left-color: #667eea;
    transform: translateX(5px);
}

.knowledge-nav .nav-item.active {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-left-color: #764ba2;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

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

.knowledge-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.knowledge-section h2 {
    color: #2c3e50;
    font-size: 2rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 3px solid #667eea;
    position: relative;
}

.knowledge-section h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 50px;
    height: 3px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 2px;
}

.knowledge-section h3 {
    color: #34495e;
    font-size: 1.5rem;
    margin: 25px 0 15px 0;
    padding-left: 15px;
    border-left: 4px solid #667eea;
}

.knowledge-section p {
    color: #555;
    line-height: 1.8;
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.knowledge-section ul {
    margin: 15px 0;
    padding-left: 30px;
}

.knowledge-section li {
    color: #555;
    line-height: 1.6;
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.knowledge-section li::marker {
    color: #667eea;
}

.knowledge-highlight {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    padding: 20px;
    border-radius: 10px;
    border-left: 5px solid #667eea;
    margin: 20px 0;
}

.knowledge-highlight p {
    margin-bottom: 0;
    font-weight: 500;
}

.knowledge-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.knowledge-table th {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.knowledge-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
    color: #555;
}

.knowledge-table tr:hover {
    background-color: #f8f9ff;
}

.knowledge-table tr:last-child td {
    border-bottom: none;
}

.knowledge-tips {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.1), rgba(39, 174, 96, 0.1));
    border: 1px solid rgba(46, 204, 113, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
}

.knowledge-tips h4 {
    color: #27ae60;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.knowledge-tips p {
    margin-bottom: 0;
    color: #2c3e50;
}

.knowledge-warning {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1), rgba(192, 57, 43, 0.1));
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
}

.knowledge-warning h4 {
    color: #e74c3c;
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.knowledge-warning p {
    margin-bottom: 0;
    color: #2c3e50;
}

/* 知识页面特殊元素样式 */
.content-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.tech-diagram {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.flow-steps .step {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 12px 20px;
    border-radius: 25px;
    font-weight: 500;
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.3);
    min-width: 150px;
    text-align: center;
}

.flow-steps .arrow {
    font-size: 1.5rem;
    color: #667eea;
    font-weight: bold;
}

.evolution-timeline {
    position: relative;
    padding: 20px 0;
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 30px;
    position: relative;
}

.timeline-year {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 10px 20px;
    border-radius: 20px;
    font-weight: bold;
    min-width: 80px;
    text-align: center;
    margin-right: 30px;
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.3);
}

.timeline-content {
    flex: 1;
    background: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid #667eea;
}

.timeline-content h4 {
    color: #2c3e50;
    margin-bottom: 8px;
    font-size: 1.2rem;
}

.timeline-content p {
    color: #555;
    margin: 0;
}

.param-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.param-item {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 20px;
    border-left: 4px solid #667eea;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.param-item h4 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.param-item p {
    color: #555;
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.param-item .example {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    padding: 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    color: #2c3e50;
}

.type-comparison {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.type-item {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    border-top: 4px solid #667eea;
}

.type-item h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    text-align: center;
}

.type-item ul {
    list-style: none;
    padding: 0;
}

.type-item li {
    padding: 5px 0;
    color: #555;
    position: relative;
    padding-left: 20px;
}

.type-item li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.brand-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.brand-item {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: transform 0.3s ease;
}

.brand-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.brand-item h4 {
    color: #2c3e50;
    margin-bottom: 12px;
    font-size: 1.3rem;
    text-align: center;
}

.brand-item p {
    color: #555;
    margin-bottom: 15px;
    line-height: 1.6;
}

.brand-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.brand-features .feature {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.compatibility-rules {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.rule-item {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 20px;
    border-left: 4px solid #667eea;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.rule-item h4 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.oc-steps {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
}

.oc-steps h4 {
    color: #2c3e50;
    margin-bottom: 15px;
}

.oc-steps ol {
    padding-left: 20px;
}

.oc-steps li {
    margin-bottom: 10px;
    color: #555;
    line-height: 1.6;
}

.warning-box {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1), rgba(192, 57, 43, 0.1));
    border: 1px solid rgba(231, 76, 60, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
}

.warning-box h4 {
    color: #e74c3c;
    margin-bottom: 10px;
}

.troubleshooting-guide {
    margin: 20px 0;
}

.problem-item {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #667eea;
}

.problem-item h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.solutions {
    margin-top: 10px;
}

.solutions p {
    margin-bottom: 8px;
}

.solutions ul {
    margin-top: 8px;
    padding-left: 20px;
}

.solutions li {
    margin-bottom: 5px;
    color: #555;
}

/* 选购指南页面样式 */
.guide-content {
    margin-top: 30px;
}

.guide-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.guide-section h2 {
    color: #2c3e50;
    font-size: 2rem;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #667eea;
    position: relative;
}

.guide-section h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 2px;
}

/* 用途选择卡片 */
.use-cases {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.use-case-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.use-case-header {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.use-case-header h3 {
    margin: 0;
    font-size: 1.4rem;
}

.difficulty {
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 500;
}

.use-case-content {
    padding: 25px;
}

.use-case-content h4 {
    color: #2c3e50;
    margin: 20px 0 12px 0;
    font-size: 1.2rem;
    border-left: 4px solid #667eea;
    padding-left: 12px;
}

.use-case-content ul {
    margin: 12px 0;
    padding-left: 20px;
}

.use-case-content li {
    margin-bottom: 8px;
    color: #555;
    line-height: 1.6;
}

.recommendations {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 10px;
    padding: 20px;
    margin: 15px 0;
}

.rec-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
    color: #2c3e50;
}

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

.rec-item .price {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 4px 12px;
    border-radius: 15px;
    font-weight: 500;
    font-size: 0.9rem;
}

.tips {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.1), rgba(39, 174, 96, 0.1));
    border: 1px solid rgba(46, 204, 113, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
}

.tips h4 {
    color: #27ae60;
    margin-bottom: 12px;
    border-left-color: #27ae60;
}

/* 预算指南 */
.budget-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.budget-tier {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: transform 0.3s ease;
}

.budget-tier:hover {
    transform: translateY(-3px);
}

.budget-tier h3 {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    margin: 0;
    padding: 20px 25px;
    font-size: 1.3rem;
}

.budget-content {
    padding: 25px;
}

.budget-content h4 {
    color: #2c3e50;
    margin: 15px 0 10px 0;
    font-size: 1.1rem;
    border-left: 3px solid #667eea;
    padding-left: 10px;
}

.budget-content p {
    color: #555;
    margin-bottom: 15px;
    line-height: 1.6;
}

.product-recommendations {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
}

.product-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.1);
    color: #2c3e50;
}

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

.product-item .price {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.85rem;
}

/* 注意事项卡片 */
.considerations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 25px;
    margin: 25px 0;
}

.consideration-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid #667eea;
}

.consideration-card h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.consideration-content h4 {
    color: #34495e;
    margin: 18px 0 10px 0;
    font-size: 1.1rem;
    border-left: 3px solid #667eea;
    padding-left: 10px;
}

.consideration-content p {
    color: #555;
    margin-bottom: 12px;
    line-height: 1.6;
}

.consideration-content ul {
    margin: 10px 0;
    padding-left: 20px;
}

.consideration-content li {
    color: #555;
    margin-bottom: 6px;
    line-height: 1.5;
}

/* 选购清单 */
.checklist-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 25px 0;
}

.checklist {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.checklist h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.3rem;
    text-align: center;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.checklist-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checklist-item {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 12px;
    border-radius: 8px;
    transition: background-color 0.3s ease;
    position: relative;
}

.checklist-item:hover {
    background: rgba(102, 126, 234, 0.05);
}

.checklist-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #667eea;
    border-radius: 4px;
    margin-right: 12px;
    position: relative;
    transition: all 0.3s ease;
}

.checklist-item input[type="checkbox"]:checked + .checkmark {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-color: #764ba2;
}

.checklist-item input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-weight: bold;
    font-size: 12px;
}

/* 快速选择器 */
.quick-selector {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.quick-selector h3 {
    color: #2c3e50;
    margin-bottom: 20px;
    font-size: 1.3rem;
    text-align: center;
    border-bottom: 2px solid #667eea;
    padding-bottom: 10px;
}

.selector-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    color: #2c3e50;
    font-weight: 500;
    font-size: 0.95rem;
}

.form-group select {
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    background: white;
    color: #2c3e50;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.generate-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 25px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.recommendation-result {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.recommendation-result h4 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.rec-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 10px;
    margin-bottom: 15px;
}

.rec-details .rec-item {
    background: rgba(255, 255, 255, 0.8);
    padding: 10px 15px;
    border-radius: 6px;
    border-left: 3px solid #667eea;
    display: block;
}

.rec-note {
    background: rgba(255, 255, 255, 0.8);
    padding: 12px;
    border-radius: 6px;
    border-left: 3px solid #f39c12;
}

.rec-note p {
    margin: 0;
    color: #2c3e50;
    font-size: 0.9rem;
}

/* 响应式设计 - 选购指南 */
@media (max-width: 768px) {
    .use-cases {
        grid-template-columns: 1fr;
    }
    
    .budget-guide {
        grid-template-columns: 1fr;
    }
    
    .considerations {
        grid-template-columns: 1fr;
    }
    
    .checklist-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .use-case-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .rec-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .product-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    
    .rec-details {
        grid-template-columns: 1fr;
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .knowledge-container {
        padding: 10px;
    }
    
    .knowledge-content {
        flex-direction: column;
        gap: 20px;
    }
    
    .knowledge-sidebar {
        flex: none;
        position: static;
        order: -1;
    }
    
    .knowledge-nav {
        padding: 15px;
    }
    
    .knowledge-nav h3 {
        font-size: 1.1rem;
        margin-bottom: 15px;
    }
    
    .knowledge-nav ul {
        display: flex;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    .knowledge-nav li {
        margin-bottom: 0;
        flex: 1;
        min-width: calc(50% - 4px);
    }
    
    .knowledge-nav .nav-item {
        padding: 8px 12px;
        font-size: 0.9rem;
        text-align: center;
        border-left: none;
        border-bottom: 2px solid transparent;
    }
    
    .knowledge-nav .nav-item:hover {
        transform: none;
        border-left-color: transparent;
        border-bottom-color: #667eea;
    }
    
    .knowledge-nav .nav-item.active {
        border-left-color: transparent;
        border-bottom-color: #764ba2;
    }
    
    .knowledge-section {
        padding: 20px;
        margin-bottom: 20px;
    }
    
    .knowledge-section h2 {
        font-size: 1.5rem;
    }
    
    .knowledge-section h3 {
        font-size: 1.3rem;
    }
    
    .knowledge-table {
        font-size: 0.9rem;
    }
    
    .knowledge-table th,
    .knowledge-table td {
        padding: 10px 8px;
    }
    
    .param-grid,
    .type-comparison,
    .brand-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .evolution-timeline .timeline-item {
        flex-direction: column;
        text-align: center;
    }
    
    .flow-steps {
        flex-direction: column;
        align-items: center;
    }
    
    .flow-steps .arrow {
        transform: rotate(90deg);
        margin: 10px 0;
    }
}