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

:root {
    --primary: #2563eb;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --tag-bg: #dbeafe;
    --tag-text: #1d4ed8;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* 头部 */
header { min-height: auto; 
    background: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 900px;
    margin: 0 auto;
    padding: 0.5rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

/* 主内容 */
main {
    max-width: 900px;
    margin: 0 auto;
    padding: 0.5rem;
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 0;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero p {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* 文章卡片 */
.articles {
    display: grid;
    gap: 1.5rem;
}

.article-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.article-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.tag {
    display: inline-block;
    background: var(--tag-bg);
    color: var(--tag-text);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.article-card h2 {
    margin: 0.75rem 0 0.5rem;
    font-size: 1.3rem;
}

.article-card p {
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

.meta {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 0.5rem;
    color: var(--text-light);
    margin-top: 3rem;
}

/* 关于/联系页面 */
.page-content {
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.page-content h1 {
    margin-bottom: 1rem;
    color: var(--primary);
}

.page-content p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

.page-content ul {
    margin-left: 1.5rem;
    color: var(--text-light);
}

.page-content li {
    margin-bottom: 0.5rem;
}

/* 响应式 */
@media (max-width: 600px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    
    main {
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
}
/* Search Box */
header .search-box {
    display: flex;
    justify-content: center;
    margin: 50px 0 5px 0;
}

.search-box form {
    display: flex;
    gap: 5px;
}

.search-box input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    width: 200px;
    font-size: 14px;
}

.search-box button {
    padding: 8px 16px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.search-box button:hover {
    background: #0056b3;
}