:root {
    --primary: #4a6cf7;
    --secondary: #6c757d;
    --light: #f8f9fa;
    --dark: #212529;
    --success: #28a745;
    --danger: #dc3545;
    --border: #dee2e6;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: #f5f7ff;
    padding-bottom: 50px;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 顶部搜索区 */
.search-section {
    background: linear-gradient(135deg, #4a6cf7, #6c5ce7);
    padding: 25px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.search-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.search-title {
    color: white;
    font-size: 1.8rem;
    font-weight: 600;
    text-align: center;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.search-box {
    display: flex;
    width: 100%;
    max-width: 600px;
    background: white;
    border-radius: 50px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.search-input {
    flex: 1;
    padding: 15px 20px;
    border: none;
    font-size: 1.1rem;
    outline: none;
}

.search-button {
    padding: 0 30px;
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    transition: var(--transition);
}

.search-button:hover {
    background: #3a5af5;
}

/* 搜索结果 */
.results-section {
    padding: 25px 0;
}

.section-title {
    font-size: 1.4rem;
    margin-bottom: 20px;
    color: var(--primary);
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
}

.results-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.result-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.result-header {
    background: var(--primary);
    color: white;
    padding: 12px 15px;
    font-weight: 600;
}

.result-content {
    padding: 15px;
}

.result-content p {
    margin-bottom: 10px;
}

.meta {
    font-size: 0.85rem;
    color: var(--secondary);
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.no-results {
    text-align: center;
    padding: 30px;
    color: var(--secondary);
    font-style: italic;
    grid-column: 1 / -1;
}

.no-results i {
    margin-bottom: 15px;
    display: block;
}

/* 导航栏 */
.nav-section {
    padding: 25px 0;
}

.categories {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.category-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.category-header {
    background: linear-gradient(to right, #4a6cf7, #6c5ce7);
    color: white;
    padding: 15px;
    font-size: 1.3rem;
    font-weight: 600;
}

.articles-list {
    padding: 15px;
}

.article-item {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

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

.article-link {
    color: var(--dark);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.article-link:hover {
    color: var(--primary);
}

.article-link i {
    margin-right: 10px;
    color: var(--primary);
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 25px 0;
    color: var(--secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border);
    margin-top: 30px;
}

.stats {
    margin-top: 10px;
    font-size: 0.8rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .search-title {
        font-size: 1.5rem;
    }
    
    .search-input {
        padding: 12px 15px;
        font-size: 1rem;
    }
    
    .search-button {
        padding: 0 20px;
    }
    
    .results-container {
        grid-template-columns: 1fr;
    }
    
    .categories {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .search-title {
        font-size: 1.3rem;
    }
    
    .search-box {
        flex-direction: column;
        border-radius: 10px;
    }
    
    .search-input {
        border-radius: 10px 10px 0 0;
    }
    
    .search-button {
        padding: 12px;
        border-radius: 0 0 10px 10px;
    }
}