/* 全体の基本設定 */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: #243447;
    background-color: #ffffff;
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Hiragino Kaku Gothic ProN",
        "Yu Gothic",
        Meiryo,
        sans-serif;
    line-height: 1.8;
}

a {
    color: inherit;
    text-decoration: none;
}

/* ヘッダー */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    color: #ffffff;
    background-color: #12355b;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1100px;
    min-height: 70px;
    margin: 0 auto;
    padding: 0 24px;
}

.site-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.main-menu ul {
    display: flex;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.main-menu a {
    display: block;
    padding: 10px 14px;
    border-radius: 6px;
}

.main-menu a:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

/* トップ画面 */
.hero {
    display: flex;
    align-items: center;
    min-height: 520px;
    padding: 70px 24px;
    color: #ffffff;
    background:
        linear-gradient(
            135deg,
            rgba(18, 53, 91, 0.97),
            rgba(0, 135, 147, 0.88)
        );
}

.hero-content {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
}

.hero-label {
    margin-bottom: 8px;
    color: #bfeef2;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.hero h1 {
    margin: 0 0 24px;
    font-size: clamp(2.4rem, 6vw, 4.5rem);
    line-height: 1.2;
}

.hero-description {
    max-width: 700px;
    margin-bottom: 32px;
    font-size: 1.1rem;
}

/* 共通レイアウト */
.container {
    max-width: 1100px;
    margin: 0 auto;
}

.section {
    padding: 80px 24px;
}

.section:nth-of-type(3) {
    background-color: #f3f6f9;
}

.section h2 {
    margin: 0 0 30px;
    color: #12355b;
    font-size: 2rem;
}

/* ボタン */
.button {
    display: inline-block;
    padding: 13px 26px;
    color: #ffffff;
    background-color: #e36b2c;
    border-radius: 8px;
    font-weight: 700;
    transition: 0.2s;
}

.button:hover {
    background-color: #c9551e;
    transform: translateY(-2px);
}

/* 説明カード */
.card-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.card {
    padding: 28px;
    background-color: #ffffff;
    border: 1px solid #dce4ea;
    border-radius: 12px;
    box-shadow: 0 5px 18px rgba(25, 50, 75, 0.08);
}

.card h3 {
    margin-top: 0;
    color: #008793;
}

/* お知らせ */
.news-list {
    margin: 0;
}

.news-list div {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 20px;
    padding: 18px 0;
    border-bottom: 1px solid #d5dde4;
}

.news-list dt {
    color: #526777;
    font-weight: 700;
}

.news-list dd {
    margin: 0;
}

/* フッター */
.site-footer {
    padding: 25px;
    color: #ffffff;
    background-color: #0b263f;
    text-align: center;
}

.site-footer p {
    margin: 0;
}

/* スマートフォン対応 */
@media (max-width: 768px) {
    .header-inner {
        display: block;
        padding-top: 15px;
        padding-bottom: 15px;
    }

    .site-title {
        display: block;
        margin-bottom: 10px;
    }

    .main-menu ul {
        flex-wrap: wrap;
        gap: 2px;
    }

    .main-menu a {
        padding: 6px 8px;
        font-size: 0.85rem;
    }

    .hero {
        min-height: 450px;
    }

    .card-container {
        grid-template-columns: 1fr;
    }

    .news-list div {
        grid-template-columns: 1fr;
        gap: 2px;
    }
}
/* 下層ページの見出し */
.page-header {
    padding: 70px 24px;
    color: #ffffff;
    background: linear-gradient(135deg, #12355b, #008793);
}

.page-header h1 {
    margin: 0 0 15px;
    font-size: clamp(2.2rem, 5vw, 3.5rem);
}

/* ここから下を追加 */
.page-header p {
    max-width: 700px;
    margin-bottom: 0;
}

.page-label {
    margin: 0 0 8px;
    color: #bfeef2;
    font-weight: 700;
    letter-spacing: 0.1em;
}

/* お問い合わせフォーム */
.contact-container {
    max-width: 800px;
}

.contact-form {
    padding: 36px;
    background-color: #ffffff;
    border: 1px solid #dce4ea;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(25, 50, 75, 0.1);
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #12355b;
    font-weight: 700;
}

.form-group input,
.form-group textarea {
    display: block;
    width: 100%;
    padding: 13px 15px;
    color: #243447;
    background-color: #ffffff;
    border: 1px solid #b7c4ce;
    border-radius: 7px;
    font: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: #008793;
    outline: 3px solid rgba(0, 135, 147, 0.15);
}

.form-group textarea {
    min-height: 180px;
    resize: vertical;
}

.required {
    display: inline-block;
    margin-left: 7px;
    padding: 1px 7px;
    color: #ffffff;
    background-color: #d94c4c;
    border-radius: 4px;
    font-size: 0.75rem;
}

.submit-button {
    border: none;
    cursor: pointer;
}

@media (max-width: 768px) {
    .page-header {
        padding-top: 50px;
        padding-bottom: 50px;
    }

    .contact-form {
        padding: 24px 18px;
    }
}

/* エラー処理追記 */
/* 入力エラー */
.error-box {
    margin-bottom: 25px;
    padding: 18px 22px;
    color: #8b1e1e;
    background-color: #fff0f0;
    border: 1px solid #e6a5a5;
    border-radius: 8px;
}

.error-box p {
    margin: 0 0 8px;
    font-weight: 700;
}

.error-box ul {
    margin: 0;
    padding-left: 22px;
}

/* お問い合わせ確認内容 */
.confirmation-list {
    margin: 30px 0;
}

.confirmation-list div {
    padding: 20px 0;
    border-bottom: 1px solid #dce4ea;
}

.confirmation-list dt {
    margin-bottom: 6px;
    color: #12355b;
    font-weight: 700;
}

.confirmation-list dd {
    margin: 0;
}

.message-text {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}