/* リセットCSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f8f8;
}

/* 汎用クラス */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.section-padding {
    padding: 80px 0;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
    color: #1a1a1a;
    letter-spacing: 2px;
}

.section-title span {
    display: block;
    font-size: 16px;
    font-weight: 400;
    color: #555;
    margin-top: 5px;
}

/* ボタンのスタイル */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: 2px solid #0056b3;
    border-radius: 4px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background-color: #0056b3;
    color: #fff;
}

.btn-primary:hover {
    background-color: #004494;
    border-color: #004494;
}

.btn-contact {
    background-color: transparent;
    color: #0056b3;
    padding: 8px 20px;
}

.btn-contact:hover {
    background-color: #0056b3;
    color: #fff;
}

/* --- ヘッダー/ナビゲーション --- */
header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    position: fixed;
    width: 100%;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: #0056b3; /* ブランドカラー */
}

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

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

header nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 5px 0;
    position: relative;
}

/* --- 1. メインビジュアル (Hero) --- */
.hero {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    /* 背景画像は適宜変更してください */
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
    color: #fff;
    padding-top: 70px; /* 固定ヘッダーの分 */
}

.hero-content h2 {
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.3;
}

.hero-content h2 strong {
    color: #ffd700; /* 再生を強調する色 */
}

.hero-content .sub-message {
    font-size: 18px;
    margin-bottom: 10px;
}

/* --- 2. 理念 (Purpose) --- */
.purpose-bg {
    background-color: #eef4f9; /* 明るい背景で区別 */
}

.purpose-box {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 20px;
    line-height: 1.8;
    color: #1a1a1a;
}

.purpose-box p {
    margin-bottom: 15px;
}

/* --- 3. 事業内容 (Solution) --- */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 2カラム */
    gap: 30px;
}

.solution-item {
    background-color: #fff;
    padding: 30px;
    border: 1px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
}

.solution-item h4 {
    font-size: 24px;
    color: #0056b3;
    margin-bottom: 10px;
    border-bottom: 2px solid #0056b3;
    padding-bottom: 5px;
}

.solution-item .theme {
    font-weight: 700;
    margin-bottom: 15px;
}

.solution-item ul {
    list-style: disc;
    margin-left: 20px;
    margin-bottom: 20px;
}

.solution-item .read-more {
    color: #0056b3;
    text-decoration: none;
    font-weight: 700;
}

.solution-item .read-more:hover {
    text-decoration: underline;
}

/* --- 4. 会社概要 (Company) --- */
.company-bg {
    background-color: #333;
    color: #fff;
}

.company-detail {
    max-width: 700px;
    margin: 0 auto;
    font-size: 16px;
    display: grid;
    grid-template-columns: 150px 1fr; /* 項目名と内容でカラム分け */
    gap: 15px;
}

.company-detail dt {
    font-weight: 700;
    color: #ffd700;
    border-bottom: 1px dashed #555;
    padding-bottom: 5px;
}

.company-detail dd {
    border-bottom: 1px dashed #555;
    padding-bottom: 5px;
}

/* --- 5. お問い合わせ (Contact) --- */
.contact-section {
    text-align: center;
    background-color: #1a1a1a;
    color: #fff;
    padding: 80px 0;
}

.contact-section h2 {
    font-size: 32px;
    margin-bottom: 10px;
    letter-spacing: 5px;
}

.contact-section p {
    margin-bottom: 30px;
}

.btn.large {
    padding: 15px 40px;
    font-size: 18px;
    margin-bottom: 15px;
}

.tel-info {
    font-size: 14px;
    color: #ccc;
}

/* --- フッター --- */
footer {
    background-color: #000;
    color: #aaa;
    padding: 30px 0;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.footer-logo {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
}

.footer-nav a {
    color: #aaa;
    text-decoration: none;
    margin: 0 10px;
    font-size: 14px;
}

.footer-nav a:hover {
    color: #fff;
}

.copyright {
    margin-top: 15px;
    font-size: 12px;
}

/* --- レスポンシブ対応 (スマートフォン向け) --- */
@media screen and (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }

    header nav ul {
        margin-top: 10px;
        justify-content: center;
    }

    header nav ul li {
        margin: 0 10px;
    }

    .hero {
        height: 80vh;
    }
    
    .hero-content h2 {
        font-size: 32px;
    }

    .section-title {
        font-size: 28px;
    }

    .solution-grid {
        grid-template-columns: 1fr; /* 1カラムに変更 */
    }

    .company-detail {
        grid-template-columns: 100px 1fr; /* 項目名を狭く */
        font-size: 14px;
    }

}