body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

header {
    background: #333;
    padding: 10px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 0;
    margin: 0;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 1.2em;
    padding: 10px 20px;
    transition: background 0.3s, color 0.3s;
    border-radius: 4px;
}

nav ul li a:hover {
    background: #fff;
    color: #333;
}

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

#hero {
    text-align: center;
    margin-bottom: 40px;
}

#hero img {
    width: 100%;
    height: auto;
    max-width: 1200px;
    border-radius: 8px;
}

#hero h1 {
    font-size: 2.5em;
    margin: 20px 0;
}

#hero p {
    font-size: 1.2em;
    color: #666;
}

#clients {
    text-align: center;
    margin-bottom: 40px;
}

#clients h2 {
    font-size: 2em;
    margin-bottom: 20px;
}

#clients ul {
    list-style: none;
    padding: 0;
}

#clients ul li {
    font-size: 1.2em;
    margin: 10px 0;
}

#services {
    text-align: center;
}

#services h2 {
    font-size: 2em;
    margin-bottom: 20px;
}

.service-item {
    background: #fff;
    margin: 20px 0;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.service-item h3 {
    font-size: 1.5em;
    color: #333;
}

.service-item p {
    font-size: 1em;
    color: #666;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 10px 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}

#contact form {
    display: flex;
    flex-direction: column;
    max-width: 600px;
    margin: 0 auto;
}

#contact label {
    font-size: 1.2em;
    margin-top: 10px;
}

#contact input, #contact textarea {
    padding: 10px;
    font-size: 1em;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

#contact button {
    padding: 10px 20px;
    font-size: 1.2em;
    color: #fff;
    background: #333;
    border: none;
    border-radius: 4px;
    margin-top: 20px;
    cursor: pointer;
    transition: background 0.3s;
}

#contact button:hover {
    background: #555;
}

/* 会社概要セクション */
#company-overview {
    text-align: center;
    padding: 40px 0;
}

#company-overview p {
    font-size: 1.2em;
    color: #444;
    margin-bottom: 20px;
}

/* 会社情報リスト */
#company-overview ul {
    list-style: none;
    padding: 0;
}

#company-overview ul li {
    font-size: 1.1em;
    color: #666;
    margin: 10px 0;
}

/* アクティブリンク */
nav ul li a.active {
    background: #fff;
    color: #333;
}