body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background-color: #f0f8ff;
    color: #333;
}

header {
    background-color: #4a90e2;
    color: white;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

main {
    padding: 40px;
    max-width: 900px;
    margin: auto;
}

h1 {
    color: #4a90e2;
}

.card {
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    margin: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.btn {
    display: inline-block;
    background-color: #4a90e2;
    color: white;
    padding: 10px 20px;
    margin-top: 15px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #357ABD;
}

footer {
    background-color: #e6f2ff;
    padding: 15px;
    text-align: center;
    font-size: 14px;
    margin-top: 40px;
}

/* ✅ 상단 네비게이션 바 */
.navbar {
    background-color: #4a90e2;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.navbar .logo {
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-decoration: none;
}

.navbar .nav-links {
    display: flex;
    gap: 20px;
}

.navbar .nav-links a {
    color: white;
    text-decoration: none;
    font-size: 16px;
}

.navbar .nav-links a:hover {
    text-decoration: underline;
}
main {
    padding: 40px;
    max-width: 1200px;
    margin: auto;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.card {
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card h1, .card h2 {
    margin-top: 0;
    color: #4a90e2;
}

.card ul {
    padding-left: 20px;
}

.btn {
    align-self: start;
    display: inline-block;
    background-color: #4a90e2;
    color: white;
    padding: 10px 20px;
    margin-top: 15px;
    border: none;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #357ABD;
}