body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8faff; /* 明るい背景色 */
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 a {
    color: #29abe2; /* 爽やかなメインカラー */
    text-decoration: none;
    font-size: 1.8em;
    font-weight: bold;
}

header nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
}

header nav ul li {
    margin-left: 20px;
}

header nav ul li a {
    text-decoration: none;
    color: #555;
    font-weight: bold;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: #29abe2;
}

.hero {
    background: linear-gradient(135deg, #e0f7fa 0%, #b2ebf2 100%); /* 爽やかなグラデーション */
    padding: 100px 0;
    text-align: center;
    color: #fff;
}

.hero .container {
    max-width: 800px;
}

.hero h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2em;
    margin-bottom: 30px;
}

.button {
    display: inline-block;
    background-color: #29abe2;
    color: #fff;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.button.small {
    padding: 8px 20px;
    font-size: 0.9em;
}

.button:hover {
    background-color: #008ac5;
}

.about, .jobs, .internship, .contact {
    padding: 80px 0;
    text-align: center;
}

.about h2, .jobs h2, .internship h2, .contact h2 {
    color: #333;
    font-size: 2em;
    margin-bottom: 30px;
}

.about p {
    max-width: 800px;
    margin: 0 auto 30px;
}

.about ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.about ul li {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.about ul li img {
    width: 80px;
    height: 80px;
    margin-bottom: 10px;
}

.about ul li span {
    font-weight: bold;
}

.jobs .job-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.jobs .job-item {
    background-color: #fff;
    padding: 30px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    text-align: left;
}

.jobs .job-item h3 {
    color: #29abe2;
    margin-bottom: 10px;
}

.jobs .job-item p {
    color: #555;
    margin-bottom: 20px;
}

.internship p, .contact p {
    max-width: 600px;
    margin: 0 auto 30px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
    font-size: 0.9em;
}

footer .container {
    padding: 20px;
}