/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 头部样式 */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    opacity: 0.8;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: white;
}

/* Hero区域 */
.hero {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-content {
    margin-bottom: 3rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 搜索框 */
.search-box {
    display: flex;
    max-width: 600px;
    margin: 0 auto;
    gap: 0;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.search-input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    font-size: 1rem;
    outline: none;
    background: white;
}

.search-btn {
    padding: 1rem 2rem;
    background: #ff6b6b;
    color: white;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}

.search-btn:hover {
    background: #ff5252;
}

/* 统计数据 */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

/* 分类区域 */
.categories {
    padding: 4rem 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 3rem;
    color: #2c3e50;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    border-color: #667eea;
}

.category-code {
    font-size: 0.9rem;
    color: #667eea;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.category-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.category-description {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.5;
}

.subcategory-count {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #eee;
    font-size: 0.85rem;
    color: #888;
}

/* 搜索结果 */
.search-results {
    padding: 2rem 0;
    background: #f8f9fa;
}

.results-container {
    display: grid;
    gap: 1rem;
}

.result-item {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.result-item:hover {
    transform: translateY(-2px);
}

.result-path {
    font-size: 0.85rem;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.result-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.result-description {
    color: #666;
    font-size: 0.9rem;
}

/* 模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 2rem;
    border-radius: 15px;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    font-weight: bold;
    cursor: pointer;
    color: #999;
    transition: color 0.3s ease;
}

.close:hover {
    color: #333;
}

.modal-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2c3e50;
}

.subcategory-list {
    display: grid;
    gap: 1rem;
}

.subcategory-item {
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.subcategory-code {
    font-weight: 600;
    color: #667eea;
    margin-bottom: 0.25rem;
}

.subcategory-name {
    font-weight: 500;
    color: #2c3e50;
}

/* 关于区域 */
.about {
    padding: 4rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.about .section-title {
    color: white;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

.about-text h3 {
    margin: 2rem 0 1rem 0;
    font-size: 1.3rem;
}

.about-text ul {
    list-style: none;
    padding-left: 0;
}

.about-text li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

.about-text li::before {
    content: '▶';
    position: absolute;
    left: 0;
    color: #ff6b6b;
}

/* 页脚 */
.footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        gap: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .search-box {
        flex-direction: column;
        border-radius: 15px;
    }
    
    .search-input,
    .search-btn {
        border-radius: 0;
    }
    
    .search-input {
        border-radius: 15px 15px 0 0;
    }
    
    .search-btn {
        border-radius: 0 0 15px 15px;
    }
    
    .stats {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
        padding: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-title {
        font-size: 1.8rem;
    }
    
    .categories,
    .about {
        padding: 2rem 0;
    }
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* 高亮搜索结果 */
.highlight {
    background-color: #fff3cd;
    padding: 0 2px;
    border-radius: 2px;
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}