:root {
    --primary: #1a73e8;
    --secondary: #5f6368;
    --bg: #f8f9fa;
    --card-bg: #ffffff;
    --text: #202124;
    --accent: #ea4335;
}

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

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

header {
    background: linear-gradient(135deg, var(--primary), #4285f4);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
}

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

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.posts {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.post-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.post-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.post-card h2 {
    margin-bottom: 0.5rem;
}

.post-card h2 a {
    color: var(--text);
    text-decoration: none;
}

.post-card h2 a:hover {
    color: var(--primary);
}

.date, .topic {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.excerpt {
    margin: 1rem 0;
    color: var(--secondary);
}

.read-more {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--secondary);
}

footer a {
    color: var(--primary);
    text-decoration: none;
}

/* Post page styles */
article.post {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

article.post h2 {
    color: var(--text);
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--bg);
}

article.post h3 {
    color: var(--secondary);
    margin: 1.5rem 0 0.5rem;
}

article.post pre {
    background: #f5f5f5;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
}

article.post blockquote {
    border-left: 4px solid var(--primary);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--secondary);
}

.quiz-section {
    background: #e8f5e9;
    padding: 1.5rem;
    border-radius: 8px;
    margin: 1rem 0;
}

.vocab-item {
    background: #fff3e0;
    padding: 1rem;
    border-radius: 8px;
    margin: 0.5rem 0;
}

.korean-text {
    font-size: 1.2em;
    color: var(--primary);
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .posts {
        grid-template-columns: 1fr;
    }
}