body {
    margin: 0;
    font-family: "Helvetica Neue", sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.8;
}

header {
    background: #1e2a38;
    color: white;
    padding: 60px 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 36px;
}

header p {
    opacity: 0.8;
}

nav {
    background: white;
    text-align: center;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

nav a {
    margin: 0 20px;
    text-decoration: none;
    color: #1e2a38;
    font-weight: bold;
}

section {
    max-width: 900px;
    margin: 60px auto;
    padding: 0 20px;
}

h2 {
    border-left: 6px solid #1e2a38;
    padding-left: 12px;
    margin-bottom: 20px;
}

footer {
    background: #1e2a38;
    color: white;
    text-align: center;
    padding: 30px;
    margin-top: 60px;
    font-size: 14px;
}

.card {
    background: white;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.photo-box {
    text-align: center;
    margin: 40px 0;
}

.photo-box figcaption {
    margin-top: 10px;
    font-size: 14px;
    color: #555;
}

.photo {
    width: 100%;
    max-width: 600px;
    border-radius: 8px;
}

nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.sns-links {
    display: flex;
    gap: 15px;
}

.sns-links a {
    padding: 10px 15px;
    text-decoration: none;
    color: white;
    border-radius: 5px;
    font-weight: bold;
}

.sns-links a:nth-child(1) {
    background-color: #1DA1F2;
    /* Twitter */
}

.sns-links a:nth-child(2) {
    background-color: #E1306C;
    /* Instagram */
}

.sns-links a:nth-child(3) {
    background-color: #41C9B4;
    /* note */
}