@charset "UTF-8";

/* ==========================================================================
   1. 基本リセット & 共通設定
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    color: #333333;
    background-color: #edf3f9;
    line-height: 1.6;
    font-size: 0.95rem; 
}
a {
    color: #1a365d;
    text-decoration: none;
    transition: all 0.2s ease;
}
ul {
    list-style: none;
}

/* ==========================================================================
   2. レイアウト & ナビゲーション（トップページ用・PCスタイル）
   ========================================================================== */
.site-wrapper {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

.left-navigation-area {
    width: 340px; 
    background-color: #1a365d; 
    color: #ffffff;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 25px 0;
    border-right: 1px solid rgba(255,255,255,0.1);
    z-index: 100;
}

/* ロゴ領域 */
.nav-logo-zone {
    padding: 0 20px 20px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.nav-logo-zone img {
    width: 100%;
    height: auto;
    background-color: #ffffff;
    padding: 8px;
    border-radius: 4px;
    display: block;
}

/* サブとメインの横並びコンテナ */
.menus-split-container {
    display: flex;
    flex-grow: 1;
}

/* サブメニュー */
.sub-vertical-menu {
    width: 115px;
    border-right: 1px solid rgba(255,255,255,0.1);
    background-color: #15294a;
    display: flex;
    flex-direction: column;
    z-index: 10;
}
.sub-vertical-menu li {
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sub-vertical-menu li a {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 24px 10px;
    color: #ffffff;
    font-size: 0.8rem; 
    font-weight: bold;
    line-height: 1.4;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}
.sub-vertical-menu li:nth-child(1) a { background: linear-gradient(135deg, #0d8383, #008c8c); }
.sub-vertical-menu li:nth-child(2) a { background: linear-gradient(135deg, #ff6b6b, #ff8787); }
.sub-vertical-menu li a:hover {
    filter: brightness(1.15);
    transform: scale(1.02);
}
.sub-vertical-menu li a::before {
    font-size: 1.4rem;
    margin-bottom: 6px;
}
.sub-vertical-menu li:nth-child(1) a::before { content: "🔓"; }
.sub-vertical-menu li:nth-child(2) a::before { content: "📅"; }

/* メインメニュー */
.main-vertical-menu {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    position: relative;
}
.main-vertical-menu > li {
    position: relative;
}
.main-vertical-menu > li > a {
    display: block;
    padding: 18px 20px;
    color: #ffffff;
    font-weight: 600;
    font-size: 0.95rem; 
    letter-spacing: 0.03em;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    position: relative;
}
.main-vertical-menu > li > a:hover {
    background-color: #1d4ed8;
    padding-left: 24px;
}
.main-vertical-menu > li.has-sub > a::after {
    content: "▶";
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.7rem;
    color: rgba(255,255,255,0.5);
    transition: all 0.2s;
}
.main-vertical-menu > li.has-sub:hover > a::after {
    color: #ffffff;
    transform: translateY(-50%) translateX(3px);
}

/* ホバーで開く下層メニュー（PC用） */
.box-gnav-third {
    position: absolute;
    top: 0;
    left: 224px; 
    width: auto;             /* 固定幅から、列数に応じて可変するautoに変更 */
    height: auto;
    min-height: 100%;
    background-color: #112542; 
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s;
    box-shadow: 5px 5px 15px rgba(0,0,0,0.15);
    border-left: 1px solid rgba(255,255,255,0.1);
    z-index: 50;
}

/* メインメニューのliをホバーしたとき、全体の横幅を制限しないように修正 */
.main-vertical-menu > li:hover .box-gnav-third {
    width: auto;             /* 幅をコンテンツ（列数）に自動追従させる */
    opacity: 1;
    visibility: visible;
}

/* ★ここを重要修正：6件ごとに右へ列を増やす設定 */
.box-gnav-third ul {
    display: grid;
    grid-template-rows: repeat(6, auto); /* 縦方向に最大6行まで配置 */
    grid-auto-flow: column;             /* 6行埋まったら自動的に右の列へ */
    grid-auto-columns: 258px;           /* 1列あたりの横幅を220pxに固定 */
    padding: 10px 0;
}

.box-gnav-third li {
    width: 258px;                       /* 各メニューアイテムの幅も揃える */
}

.box-gnav-third li a {
    display: block;
    padding: 12px 20px;
    color: #e2e8f0;
    font-size: 0.9rem;
    font-weight: 500;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    white-space: nowrap;                /* 文字が途中で改行されて崩れるのを防ぐ */
}
.box-gnav-third li a:hover {
    background-color: #2b6cb0;
    color: #ffffff;
    padding-left: 25px;
}

.nav-footer-zone {
    padding: 20px 20px 0 20px;
    font-size: 0.8rem;
    color: #a0aec0;
    border-top: 1px solid rgba(255,255,255,0.1);
}

#btn_menu { display: none; }
.responsive-main-nav { display: none; }

/* ==========================================
   3. 右側：メインコンテンツ・エリア共通
========================================== */
.right-content-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    min-width: 850px; 
    background-color: #edf3f9;
}

/* 最上部サブツールバー */
.top-sub-bar {
    background-color: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    padding: 12px 40px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    font-size: 0.85rem;
}
.top-sub-bar a {
    background-color: #f7fafc;
    padding: 5px 12px;
    border-radius: 4px;
    border: 1px solid #1a365d;
    color: #4a5568;
}
.top-sub-bar a:hover {
    background-color: #edf2f7;
    color: #1a365d;
}

/* ヒーロービジュアル */
.hero-section {
    position: relative;
    height: 450px;
    background-image: linear-gradient(rgba(0,0,0,0.15), rgba(0,0,0,0.25)), url('images/main-img.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-box-wrapper {
    background-color: rgba(255, 255, 255, 0.8); 
    padding: 25px;
    border-radius: 6px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    width: 100%;
    max-width: 720px;
    margin: 0 20px;
}
.search-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
    border-bottom: 2px solid #1a365d;
}
.search-tab {
    padding: 6px 16px;
    background-color: #edf2f7;
    opacity: 0.8;
    color: #4a5568;
    font-weight: bold;
    font-size: 0.9rem;
    border-radius: 4px 4px 0 0;
    cursor: pointer;
    border: none;
}
.search-tab.active {
    background-color: #1a365d;
    color: #ffffff;
}
.search-form-inner {
    display: flex;
    gap: 8px;
}
.search-input {
    flex: 1;
    padding: 10px 14px;
    border: 2px solid #cbd5e0;
    border-radius: 4px;
    font-size: 0.rem;
    outline: none;
}
.search-input:focus {
    border-color: #1a365d;
}
.search-btn {
    background-color: #1a365d;
    opacity: 0.8;
    color: #ffffff;
    border: none;
    padding: 0 25px;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    margin-top: 1px;
    margin-bottom: 1px;
}
.search-btn:hover { background-color: #2b6cb0; }

/* ボタンを並べるコンテナ（中央揃え ＆ スマホ対応） */
.search-links-container {
    display: flex;
    justify-content: flex-start;
    flex-wrap: wrap;       /* 画面が狭くなったら自動で折り返す設定 */
    gap: 9px;             /* ボタン同士の間隔 */
    margin-top: 20px;      /* 検索窓との隙間 */
    margin-left: 2px;
}

/* ボタンの基本スタイル */
.search-link-btn {
    display: inline-block;
    padding: 5px 10px;       /* ボタンの上下・左右の余白（サイズ感） */
    background-color: #edf2f7; /* ボタンの背景色（カレンダーの土曜日と同じ青） */
    color: #4a5568;           /* 文字の色（白） */
    text-decoration: none;    /* 下線を消す */
    border-radius: 6px;       /* 角の丸み */
    font-size: 0.8rem;        /* 文字の大きさ */
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1); /* 軽い影（立体感） */
    opacity: 0.8;

}

/* マウスを乗せたとき（ホバー時）の見た目 */
.search-link-btn:hover {
    background-color: #1a365d; /* 少し濃い青にして「押せる感」を出す */
    color: #ffffff;            /* 文字は白をキープ */
}

/* メイングリッド */
.main-grid {
    max-width: 1200px;
    width: 100%;
    margin: 40px auto;
    padding: 0 40px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    flex-grow: 1;
}

.section-title {
    font-size: 1.25rem;
    color: #1a365d;
    border-left: 5px solid #1a365d;
    padding-left: 10px;
    margin-bottom: 15px;
    font-weight: 700;
}
.news-list {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 30px;
}
.news-item {
    display: flex;
    border-bottom: 1px solid #edf2f7;
    padding: 14px 20px;
    align-items: flex-start;
}
.news-item:last-child { border-bottom: none; }
.news-meta { width: 120px; flex-shrink: 0; }
.news-date { font-size: 0.85rem; color: #718096; display: block; }
.news-category {
    display: inline-block;
    font-size: 0.75rem;
    padding: 1px 6px;
    border-radius: 3px;
    font-weight: bold;
    background-color: #e2e8f0;
    color: #4a5568;
}
.news-category.important { background-color: #fed7d7; color: #c53030; }
.news-text { font-size: 0.95rem; }

.banner-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}
.banner-card {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 18px 20px;
    text-align: center;
}
.banner-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.065);
    border-color: #cbd5e0;
}
.banner-card h3 { font-size: 1.05rem; color: #1a365d; margin-bottom: 4px; }
.banner-card p { font-size: 0.85rem; color: #718096; }

.library-zones {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}
.zone-card {
    background-color: #f8fafc;
    border-top: 4px solid #4a5568;
    padding: 14px;
    border-radius: 0 0 4px 4px;
}
.zone-card.g-floor { border-top-color: #2b6cb0; }
.zone-card.a-floor { border-top-color: #9f7aea; }
.zone-card.e-floor { border-top-color: #48bb78; }
.zone-card h4 { font-size: 0.95rem; margin-bottom: 4px; color: #2d3748; }
.zone-card p { font-size: 0.85rem; color: #4a5568; line-height: 1.4; }

/* ==========================================
   4. サイドバー：開館カレンダー
========================================== */
.sidebar { display: flex; flex-direction: column; gap: 0px; }

.calendar-widget {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 15px;
}
.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    color: #1a365d;
}
.calendar-title-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
}
.calendar-title-main { font-weight: bold; font-size: 0.95rem; }
.calendar-title-sub { font-size: 0.95rem; font-weight: bold; margin-top: 9px; }

.cal-btn {
    cursor: pointer;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem; 
    color: #4a5568;
    background-color: #edf2f7;
    border-radius: 4px;
    transition: all 0.2s ease;
    user-select: none;
}
.cal-btn:hover { background-color: #1a365d; color: #ffffff; }
.cal-btn.disabled { visibility: hidden; pointer-events: none; }

.calendar-month-pane { display: none; }
.calendar-month-pane.active { display: block; }

.calendar-table { width: 100%; border-collapse: collapse; text-align: center; font-size: 0.85rem; }
.calendar-table th { padding: 5px; background-color: #f7fafc; color: #718096; }
.calendar-table td { padding: 6px 4px; border-bottom: 1px solid #f0f4f8; }
.calendar-table td.today { background-color: #e2e8f0; font-weight: bold; border-radius: 4px; }
.calendar-table td.closed { color: #e53e3e; background-color: #fff5f5; }

.side-btn-list { display: flex; flex-direction: column; gap: 8px; padding-bottom: 30px;}
.side-btn {
    display: block;
    background-color: #ffffff;
    border: 1px solid #cbd5e0;
    padding: 12px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.95rem; 
    text-align: center;
}
.side-btn:hover { background-color: #1a365d; color: #ffffff; }

/* ==========================================
   5. 全体フッター（トップ & 共通スタイル）
========================================== */
footer {
    background-color: #2d3748;
    color: #e2e8f0;
    padding: 35px 40px 20px 40px;
    margin-top: auto;
    font-size: 0.85rem;
}
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 30px;
    border-bottom: 1px solid #4a5568;
    padding-bottom: 25px;
}
.footer-info h2 { font-size: 1.05rem; color: #ffffff; margin-bottom: 8px; }
.footer-info p { color: #a0aec0; margin-bottom: 3px; }
.footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.footer-links p { font-weight: bold; margin-bottom: 6px; color: #ffffff; }
.footer-links ul { display: flex; flex-direction: column; gap: 4px; }
.footer-links a { color: #cbd5e0; }
.footer-links a:hover { color: #ffffff; }
.footer-copyright { text-align: center; padding-top: 15px; color: #718096; font-size: 0.8rem; }

/* ==========================================
   6. 独立個別ページ（利用案内等）専用1カラムスタイル
   ========================================== */
.subpage-header {
    background-color: #1a365d;
    color: #ffffff;
    padding: 20px 40px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.subpage-header-inner {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.subpage-site-title { font-size: 1.2rem; font-weight: 700; letter-spacing: 0.05em; }
.subpage-site-title a { color: #ffffff; }
.subpage-back-btn {
    background-color: rgba(255, 255, 255, 0.15);
    color: #ffffff;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: bold;
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.subpage-back-btn:hover { background-color: #ffffff; color: #1a365d; text-decoration: none; }

.subpage-container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 40px;
}
.subpage-page-header {
    border-bottom: 2px solid #1a365d;
    padding-bottom: 15px;
    margin-bottom: 35px;
}
.subpage-page-title { font-size: 1.8rem; color: #1a365d; font-weight: 700; }

.subpage-section-block {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.02);
}
.subpage-section-title {
    font-size: 1.3rem;
    color: #1a365d;
    border-left: 5px solid #1a365d;
    padding-left: 12px;
    margin-bottom: 20px;
    font-weight: 700;
}
.subpage-subsection-title {
    font-size: 1.05rem;
    color: #2d3748;
    margin: 24px 0 10px 0;
    font-weight: 700;
    display: flex;
    align-items: center;
}
.subpage-subsection-title::before {
    content: "■";
    color: #2b6cb0;
    font-size: 0.8rem;
    margin-right: 8px;
}

.subpage-text-p { margin-bottom: 15px; line-height: 1.7; }
ul.subpage-text-list { list-style-type: disc; padding-left: 20px; margin-bottom: 15px; }
ul.subpage-text-list li { margin-bottom: 6px; line-height: 1.7; }

.subpage-zone-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; margin-bottom: 20px; }
.subpage-zone-item { background-color: #f8fafc; border-top: 4px solid #4a5568; padding: 15px; border-radius: 0 0 4px 4px; }
.subpage-zone-item.g-floor { border-top-color: #2b6cb0; }
.subpage-zone-item.a-floor { border-top-color: #9f7aea; }
.subpage-zone-item.e-floor { border-top-color: #48bb78; }
.subpage-zone-item h4 { font-size: 0.95rem; font-weight: 700; color: #1a365d; margin-bottom: 6px; }
.subpage-zone-item p { font-size: 0.85rem; color: #4a5568; line-height: 1.5; margin-bottom: 0; }

.subpage-caution-box {
    background-color: #fff5f5;
    border: 1px solid #fed7d7;
    border-left: 4px solid #e53e3e;
    padding: 15px 20px;
    border-radius: 4px;
    margin: 15px 0;
    color: #c53030;
}
.subpage-caution-box h4 { font-weight: bold; margin-bottom: 5px; font-size: 0.95rem; }
.subpage-caution-box p { font-size: 0.9rem; margin-bottom: 0; }

.subpage-table-responsive { width: 100%; overflow-x: auto; margin: 15px 0 25px 0; border: 1px solid #e2e8f0; border-radius: 4px; }
.subpage-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 0.9rem; }
.subpage-table th, .subpage-table td { padding: 12px 16px; border-bottom: 1px solid #edf2f7; }
.subpage-table th { background-color: #f7fafc; color: #4a5568; font-weight: 700; white-space: nowrap; }
.subpage-table tr:last-child td { border-bottom: none; }
.subpage-table-badge { display: inline-block; background-color: #1a365d; color: #ffffff; font-size: 0.75rem; padding: 2px 6px; border-radius: 3px; font-weight: bold; }

.subpage-bottom-actions { text-align: center; margin-top: 50px; margin-bottom: 20px; }
.subpage-large-back-btn {
    display: inline-block;
    background-color: #1a365d;
    color: #ffffff;
    padding: 14px 40px;
    border-radius: 4px;
    font-weight: bold;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: all 0.2s;
}
.subpage-large-back-btn:hover { background-color: #2b6cb0; color: #ffffff; text-decoration: none; transform: translateY(-1px); }

.subpage-footer { background-color: #2d3748; color: #cbd5e0; padding: 25px 40px; text-align: center; font-size: 0.8rem; margin-top: auto; }

/* ==========================================
   7. レスポンシブ制御 (@media 1100px以下)
   ========================================== */
@media (max-width: 1100px) {
    .site-wrapper {
        flex-direction: column;
    }
    .left-navigation-area {
        width: 100%;
        height: auto;
        position: relative;
        padding: 12px 20px;
        background-color: #1a365d; 
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.1); 
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: space-between; 
    }
    .nav-logo-zone {
        border-bottom: none;
        padding: 0;
        width: 200px;
    }
    .nav-logo-zone img {
        padding: 4px;
        border-radius: 4px;
    }
    .menus-split-container .main-vertical-menu,
    .nav-footer-zone {
        display: none;
    }
    .menus-split-container {
        display: flex !important; 
        margin-left: auto;        
        margin-right: 15px;       
        flex-grow: 0;
    }
    .sub-vertical-menu {
        width: auto;
        flex-direction: row;      
        background-color: transparent;
        border-right: none;
        gap: 6px;
    }
    .sub-vertical-menu li { border-bottom: none; }
    .sub-vertical-menu li a {
        display: flex;
        flex-direction: row;      
        align-items: center;
        gap: 5px;
        padding: 8px 12px;
        border-radius: 4px;
        font-size: 0.78rem;
        box-shadow: 0 2px 4px rgba(0,0,0,0.15);
        white-space: nowrap;      
    }
    .sub-vertical-menu li a::before { margin-bottom: 0; font-size: 1rem; }

    .right-content-area { min-width: 100%; }

    #btn_menu {
        display: block;
        width: 44px;
        height: 44px;
        background-color: #112542; 
        border: 1px solid rgba(255,255,255,0.2);
        border-radius: 4px;
        position: relative;
        cursor: pointer;
        flex-shrink: 0;
    }
    .btn_menu_line {
        display: block;
        width: 22px;
        height: 2px;
        background-color: #ffffff;
        position: absolute;
        left: 10px;
        top: 20px;
        transition: background-color 0.3s;
    }
    #btn_menu::before, #btn_menu::after {
        content: "";
        display: block;
        width: 22px;
        height: 2px;
        background-color: #ffffff;
        position: absolute;
        left: 10px;
        transition: transform 0.3s, top 0.3s;
    }
    #btn_menu::before { top: 12px; }
    #btn_menu::after { top: 28px; }

    #btn_menu.active .btn_menu_line { background-color: transparent; }
    #btn_menu.active::before { top: 20px; transform: rotate(45deg); }
    #btn_menu.active::after { top: 20px; transform: rotate(-45deg); }

    .responsive-main-nav {
        display: block;
        width: 100%;
        background-color: #1a365d;
        max-height: 0; 
        overflow: hidden;
        transition: max-height 0.4s ease-in-out;
    }
    .responsive-main-nav.open { max-height: 800px; }
    .responsive-main-nav > ul {
        display: flex;
        flex-direction: column;
        border-top: 1px solid rgba(255,255,255,0.1);
    }
    .responsive-main-nav > ul > li {
        width: 100%;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    .responsive-main-nav > ul > li > a {
        display: block;
        padding: 15px 20px;
        color: #ffffff;
        font-size: 0.95rem;
        font-weight: bold;
        position: relative;
    }
    .responsive-main-nav li.has-sub-sp > a::after {
        content: "▼";
        position: absolute;
        right: 20px;
        top: 50%;
        transform: translateY(-50%);
        font-size: 0.75rem;
        color: rgba(255,255,255,0.6);
        transition: transform 0.3s;
    }
    .responsive-main-nav li.has-sub-sp.active-sub > a::after { transform: translateY(-50%) rotate(180deg); }

    .box-gnav-third-sp {
        background-color: #112542;
        max-height: 0; 
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }
    .responsive-main-nav li.has-sub-sp.active-sub .box-gnav-third-sp { max-height: 300px; }
    .box-gnav-third-sp li a {
        display: block;
        padding: 12px 35px;
        color: #cbd5e0;
        font-size: 0.9rem;
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .box-gnav-third-sp li a:hover { background-color: #2b6cb0; color: #ffffff; }

    .box-gnav-third { display: none !important; }
    .top-sub-bar { padding: 8px 15px; }
    .main-grid { padding: 0 20px; margin: 25px auto; }
}

@media (max-width: 850px) {
    .main-grid { grid-template-columns: 1fr; gap: 30px; }
    .library-zones { grid-template-columns: 1fr; }
}

/* ==========================================
   8. スマートフォン個別調整（650px以下 & 768px以下個別）
   ========================================== */
@media (max-width: 768px) {
    .subpage-header { padding: 15px 20px; }
    .subpage-container { margin: 25px auto; padding: 0 15px; }
    .subpage-section-block { padding: 20px; }
    .subpage-zone-grid { grid-template-columns: 1fr; gap: 12px; }
    .subpage-page-title { font-size: 1.5rem; }
}

@media (max-width: 650px) {
    .left-navigation-area {
        background-color: #1a365d; 
        padding: 12px 15px;
    }
    .nav-logo-zone {
        min-width: 160px;
        width: 160px;
        margin-right: 9px;
        flex-shrink: 0;
    }
    .menus-split-container {
        margin-left: auto;        
        margin-right: 12px;       
    }
    .sub-vertical-menu { gap: 0; }
    .sub-vertical-menu li a { padding: 3px 10px; font-size: 0.72rem; }
    .sub-vertical-menu li:nth-child(2) { display: none; }
    
    .right-content-area { display: flex; flex-direction: column; }
    
    /* 成城大学図書館参考のスマホ高さを維持 */
    .hero-section { height: 460px; }
    .search-box-wrapper { padding: 20px 15px; margin: 0 12px; }

    .top-sub-bar {
        order: 10; 
        justify-content: center;
        padding: 15px;
        background-color: #edf2f7;
        border-top: 1px solid #cbd5e0;
        border-bottom: none;
        width: 100%;
        gap: 10px;
    }
    
    .search-form-inner { flex-direction: row; padding:0;}
    .search-input { font-size: 0.75rem; padding: 14px 14px;}
    .search-btn {background-color: #aaa;padding: 0 6px; border: 2px solid #cbd5e0;}
    .search-form-inner { gap: 0px;}
    .banner-grid { grid-template-columns: 1fr; }
    .footer-container { grid-template-columns: 1fr; }
}