:root {
    --primary-color: #1a73e8;
    --text-color: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --content-width: 728px;
}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 728px;
    margin: 20px auto;
    padding: 0 16px;
}

/* Navigation */
.top-nav {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-logo {
    font-size: 24px;
    font-weight: 700;
    color: #000;
    text-decoration: none;
}
.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}
.nav-item {
    margin-left: 20px;
}
.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 0;
}
.nav-link:hover {
    color: var(--primary-color);
}
.auth-buttons {
    display: flex;
    margin-left: 20px;
}
.auth-button {
    margin-left: 12px;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    text-decoration: none;
}

/* Article Styles */
header {
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    margin-bottom: 24px;
}
.article-header {
    margin-bottom: 24px;
}
h1 {
    font-size: 36px;
    line-height: 1.2;
    font-weight: 700;
    margin: 0 0 16px 0;
}
.meta {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}
.article-content {
    font-size: 18px;
    line-height: 1.7;
}
.article-content p {
    margin-bottom: 24px;
}
.article-content h2 {
    font-size: 24px;
    margin: 32px 0 16px 0;
    font-weight: 700;
}
.article-content h3 {
    font-size: 20px;
    margin: 28px 0 16px 0;
    font-weight: 600;
}
.quote {
    border-left: 4px solid var(--border-color);
    padding-left: 16px;
    margin: 24px 0;
    font-style: italic;
    color: var(--text-secondary);
}
.list {
    margin: 24px 0;
    padding-left: 24px;
}
.list li {
    margin-bottom: 12px;
}
.timestamp {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 40px;
}
footer {
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
    padding: 24px 0;
    font-size: 14px;
    color: var(--text-secondary);
}
/* 图片容器新样式 */
.article-image-container {
    width: 100%;
    max-width: var(--content-width);
    margin: 30px auto;
}

.article-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
    object-fit: cover;
    aspect-ratio: 16/9;
}

.image-caption {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
    max-width: 600px; /* 与文本宽度对齐 */
    margin-left: auto;
    margin-right: auto;
    padding: 0 64px; /* 补偿容器差异 */
}

.read-more {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    margin-top: 10px;
}
.read-more:hover {
    text-decoration: underline;
}
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    h1 {
        font-size: 28px;
    }
    .article-content {
        font-size: 16px;
    }
    .article-content h2 {
        font-size: 20px;
    }
    .article-content h3 {
        font-size: 18px;
    }
}