/* 1. 기본 초기화 (여백 제거) */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

/* 2. 헤더 스타일 */
header {
    background-color: #2c3e50;
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

header h1 {
    margin-bottom: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 20px;
}

nav a {
    color: #ecf0f1;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    color: #3498db;
}

/* 3. 메인 콘텐츠 스타일 */
main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

section, article {
    margin-bottom: 30px;
}

h2, h3 {
    color: #2c3e50;
    margin-bottom: 10px;
    border-bottom: 2px solid #3498db;
    display: inline-block;
}

/* 4. 푸터 스타일 */
footer {
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
    color: #777;
}