/* 기본 설정 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f7f7f7;
}

/* 공통 레이아웃 */
header, .hero, .content, footer {
    width: 100%;
    max-width: 1200px;
    margin: auto;
}

/* 헤더 */
header {
    background: #ffffff;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

header a {
    text-decoration: none;
    color: #333;
    margin-left: 15px;
    font-weight: bold;
}

/* 메인 배너 */
.hero {
    background: #2866c7;
    color: #fff;
    padding: 60px 30px;
    text-align: center;
}

.hero h1 {
    margin: 0 0 10px;
    font-size: 2.8em;
}

.hero p {
    font-size: 1.2em;
}

/* 컨텐츠 영역 */
.content {
    padding: 30px;
    background: #fff;
}

.section-title {
    font-size: 1.6em;
    border-bottom: 3px solid #2866c7;
    display: inline-block;
    margin-bottom: 15px;
}

/* 강의 리스트 */
.course-list {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.course-item {
    background: #fafafa;
    border: 1px solid #ddd;
    padding: 15px;
    width: calc(33.333% - 10px);
    box-sizing: border-box;
}

/* 푸터 */
footer {
    text-align: center;
    padding: 15px;
    background: #fff;
    margin-top: 30px;
    font-size: 0.9em;
    color: #555;
}