:root {
    --bg-color: #d4cfc3;
    --text-color: #2c2c2c;
    --accent-color: #8c7355;
    --card-bg: #ffffff;
    --border-color: #e0dcd3;
}

body {
    margin: 0;
    font-family: 'Noto Serif JP', serif;
    background-color: var(--bg-color);
    color: var(--text-color);
}

[hidden] { display: none !important; }

.view {
    display: none;
}

.view.active {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ---- Header ---- */
#search-view header {
    flex-shrink: 0;
    text-align: center;
    padding: 1.2rem 1rem;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

h1 {
    margin: 0 0 0.7rem;
    color: var(--accent-color);
    letter-spacing: 2px;
    font-size: 1.5rem;
}

.search-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.7rem;
    max-width: 520px;
    margin: 0 auto;
}

#search-input {
    flex: 1;
    min-width: 200px;
    padding: 0.55rem 0.9rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

#search-input:focus {
    border-color: var(--accent-color);
}

#search-button {
    padding: 0.55rem 1.4rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: bold;
    transition: background 0.2s;
    white-space: nowrap;
}

#search-button:hover {
    background: #6a553c;
}

/* ---- Two-column layout ---- */
.content-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ---- 左：作品リスト ---- */
.list-column {
    width: 300px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    background: var(--bg-color);
    overflow: hidden;
}

.book-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem 0;
}

.list-message {
    text-align: center;
    padding: 2rem;
    color: #888;
    font-size: 0.9rem;
}

.book-card {
    padding: 0.55rem 1rem;
    cursor: pointer;
    border-left: 3px solid transparent;
    transition: background 0.15s, border-color 0.15s;
}

.book-card:hover {
    background: rgba(140,115,85,0.08);
}

.book-card.selected {
    background: var(--card-bg);
    border-left-color: var(--accent-color);
}

.book-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-color);
    line-height: 1.4;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.book-card.selected .book-title {
    color: var(--accent-color);
}

.book-author {
    font-size: 0.75rem;
    color: #888;
    margin-top: 0.1rem;
}

/* Pagination */
.pagination {
    flex-shrink: 0;
    text-align: center;
    padding: 0.6rem 0;
    border-top: 1px solid var(--border-color);
    background: var(--bg-color);
    font-size: 0.8rem;
}

.pagination button {
    padding: 0.3rem 0.9rem;
    margin: 0 0.3rem;
    cursor: pointer;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.8rem;
}

.pagination button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.pagination button:not(:disabled):hover {
    background: #f0ede8;
}

#page-info {
    color: #888;
}

/* ---- 右：作品詳細パネル ---- */
#detail-panel {
    flex: 1;
    background: var(--card-bg);
    overflow-y: auto;
    padding: 2.5rem 3rem;
    box-sizing: border-box;
}

#detail-placeholder {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #bbb;
    font-size: 1rem;
    text-align: center;
    line-height: 2.2;
}

#detail-content {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
    max-width: 680px;
}

/* サムネイル＋タイトルブロック */
#detail-header {
    display: flex;
    gap: 1.8rem;
    align-items: flex-start;
}

#detail-thumbnail {
    width: 100px;
    height: 140px;
    flex-shrink: 0;
    background: linear-gradient(145deg, #e8e2d8, #d0c9bc);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #aaa;
    writing-mode: vertical-rl;
    letter-spacing: 0.1em;
    overflow: hidden;
}

#detail-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

#detail-title-block {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

#detail-genre span {
    display: inline-block;
    padding: 0.15rem 0.65rem;
    background: var(--accent-color);
    color: #fff;
    border-radius: 3px;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
}

#detail-title {
    margin: 0;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1.4;
}

#detail-author {
    font-size: 1rem;
    color: #555;
}

#detail-meta {
    font-size: 0.8rem;
    color: #999;
    line-height: 1.8;
}

/* 概要 */
#detail-summary {
    margin: 0;
    font-size: 0.95rem;
    line-height: 2;
    color: #333;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

/* タグ */
#detail-tags {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.tag-category {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.tag-category-label {
    font-size: 0.75rem;
    color: #999;
    white-space: nowrap;
    flex-shrink: 0;
    min-width: 9em;
}

.tag-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: baseline;
}

.tag-item {
    padding: 0.2rem 0.65rem;
    border-radius: 3px;
    font-size: 0.8rem;
    border: 1px solid transparent;
}

/* ジャンル：琥珀・ゴールド */
[data-cat="ジャンル"] .tag-category-label { color: #8a6a00; }
[data-cat="ジャンル"] .tag-item {
    background: #fdf5d9;
    border-color: #d4a800;
    color: #7a5c00;
}

/* サブジャンル：テラコッタ・オレンジ */
[data-cat="サブジャンル"] .tag-category-label { color: #904010; }
[data-cat="サブジャンル"] .tag-item {
    background: #fdebd8;
    border-color: #c87830;
    color: #7a4010;
}

/* 時代：セージグリーン */
[data-cat="時代"] .tag-category-label { color: #2d7a5a; }
[data-cat="時代"] .tag-item {
    background: #e6f5ee;
    border-color: #5aaa88;
    color: #1e6048;
}

/* 文学運動・流派：ラベンダー */
[data-cat="文学運動・流派"] .tag-category-label { color: #5a3890; }
[data-cat="文学運動・流派"] .tag-item {
    background: #f2eafc;
    border-color: #9a70cc;
    color: #4a2880;
}

/* テーマ：ダスティローズ */
[data-cat="テーマ"] .tag-category-label { color: #903040; }
[data-cat="テーマ"] .tag-item {
    background: #faeaec;
    border-color: #c07080;
    color: #7a2030;
}

/* 形式・文体：スレートブルー */
[data-cat="形式・文体"] .tag-category-label { color: #2050a0; }
[data-cat="形式・文体"] .tag-item {
    background: #e8edf8;
    border-color: #6080c0;
    color: #1a3e90;
}

/* ---- タグフィルター（右カラム） ---- */
#tag-filter-column {
    width: 260px;
    flex-shrink: 0;
    border-left: 1px solid var(--border-color);
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#tag-filter-header {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border-color);
}

#tag-filter-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.55rem 0.8rem;
}

#tag-filter-title {
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--accent-color);
    letter-spacing: 0.02em;
}

#tag-clear-btn {
    background: none;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
    border-radius: 3px;
    padding: 0.1rem 0.5rem;
    font-family: inherit;
    font-size: 0.7rem;
    cursor: pointer;
    white-space: nowrap;
}

#tag-clear-btn:hover {
    background: rgba(140, 115, 85, 0.1);
}

#tag-limit-msg {
    margin: 0;
    padding: 0.35rem 0.8rem;
    font-size: 0.75rem;
    color: #c05050;
    background: #fdf0f0;
}

#tag-filter {
    flex: 1;
    overflow-y: auto;
    padding: 0.3rem 0;
    display: flex;
    flex-direction: column;
}

.filter-section {
    padding: 0.5rem 0.7rem 0.4rem;
    border-bottom: 1px solid var(--border-color);
}

.filter-section:last-child {
    border-bottom: none;
}

.filter-section-label {
    font-size: 0.7rem;
    font-weight: bold;
    letter-spacing: 0.05em;
    margin-bottom: 0.35rem;
    display: block;
}

.filter-section-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.filter-chip {
    cursor: pointer;
    padding: 0.15rem 0.6rem;
    border-radius: 3px;
    font-size: 0.75rem;
    border: 1px solid transparent;
    font-family: inherit;
    line-height: 1.6;
    transition: filter 0.12s;
}

.filter-chip:hover { filter: brightness(0.92); }

.filter-chip[data-cat="ジャンル"] { background: #fdf5d9; border-color: #d4a800; color: #7a5c00; }
.filter-chip[data-cat="ジャンル"].active { background: #d4a800; color: white; }
.filter-section[data-cat="ジャンル"] .filter-section-label { color: #8a6a00; }

.filter-chip[data-cat="サブジャンル"] { background: #fdebd8; border-color: #c87830; color: #7a4010; }
.filter-chip[data-cat="サブジャンル"].active { background: #c87830; color: white; }
.filter-section[data-cat="サブジャンル"] .filter-section-label { color: #904010; }

.filter-chip[data-cat="時代"] { background: #e6f5ee; border-color: #5aaa88; color: #1e6048; }
.filter-chip[data-cat="時代"].active { background: #5aaa88; color: white; }
.filter-section[data-cat="時代"] .filter-section-label { color: #2d7a5a; }

.filter-chip[data-cat="文学運動・流派"] { background: #f2eafc; border-color: #9a70cc; color: #4a2880; }
.filter-chip[data-cat="文学運動・流派"].active { background: #9a70cc; color: white; }
.filter-section[data-cat="文学運動・流派"] .filter-section-label { color: #5a3890; }

.filter-chip[data-cat="テーマ"] { background: #faeaec; border-color: #c07080; color: #7a2030; }
.filter-chip[data-cat="テーマ"].active { background: #c07080; color: white; }
.filter-section[data-cat="テーマ"] .filter-section-label { color: #903040; }

.filter-chip[data-cat="形式・文体"] { background: #e8edf8; border-color: #6080c0; color: #1a3e90; }
.filter-chip[data-cat="形式・文体"].active { background: #6080c0; color: white; }
.filter-section[data-cat="形式・文体"] .filter-section-label { color: #2050a0; }

/* 詳細パネルのタグをクリック可能にする */
.tag-item {
    cursor: pointer;
    transition: filter 0.12s;
}

.tag-item:hover { filter: brightness(0.88); }

/* 読むボタン */
#detail-read-btn {
    align-self: flex-start;
    padding: 0.75rem 2rem;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    font-weight: bold;
    transition: background 0.2s;
}

#detail-read-btn:hover {
    background: #6a553c;
}

/* ---- タグフィルターヘッダー右側グループ ---- */
.tag-filter-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* ---- モバイル専用要素（デスクトップでは非表示） ---- */
#mobile-back-btn,
#filter-open-btn,
#filter-close-btn {
    display: none;
}

/* ---- モバイルレイアウト ---- */
@media (max-width: 767px) {

    /* スクロール制御 */
    body.mobile-detail-open,
    body.mobile-filter-open {
        overflow: hidden;
    }

    /* 検索バー：フィルターボタンを2行目に */
    .search-bar {
        flex-wrap: wrap;
    }
    #search-input {
        min-width: 0;
    }
    #filter-open-btn {
        display: block;
        flex-basis: 100%;
        padding: 0.45rem 1rem;
        background: none;
        border: 1px solid var(--accent-color);
        border-radius: 4px;
        font-family: inherit;
        font-size: 0.9rem;
        color: var(--accent-color);
        cursor: pointer;
        text-align: center;
        transition: background 0.15s;
    }
    #filter-open-btn:hover {
        background: rgba(140, 115, 85, 0.08);
    }
    #filter-open-btn.has-filter {
        background: var(--accent-color);
        color: white;
    }

    /* コンテンツレイアウト：リストが全幅 */
    .list-column {
        width: 100%;
        border-right: none;
    }

    /* 詳細パネル：デフォルト非表示→フルスクリーンオーバーレイ */
    #detail-panel {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 100;
        padding: 0;
        overflow-y: auto;
    }
    body.mobile-detail-open #detail-panel {
        display: block;
    }

    /* 戻るボタン */
    #mobile-back-btn {
        display: flex;
        align-items: center;
        position: sticky;
        top: 0;
        z-index: 10;
        width: 100%;
        padding: 0.75rem 1rem;
        background: var(--card-bg);
        border: none;
        border-bottom: 1px solid var(--border-color);
        font-family: inherit;
        font-size: 0.9rem;
        color: var(--accent-color);
        cursor: pointer;
        box-sizing: border-box;
    }

    /* 詳細パネル内のコンテンツにパディング付与 */
    #detail-placeholder,
    #detail-content {
        padding: 1.5rem 1.2rem;
    }
    #detail-content {
        max-width: none;
    }

    /* タグフィルター列：デフォルト非表示→フルスクリーンオーバーレイ */
    #tag-filter-column {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 200;
        width: 100%;
        border-left: none;
        overflow: hidden;
    }
    body.mobile-filter-open #tag-filter-column {
        display: flex;
    }

    /* フィルター内のチップエリアだけスクロール */
    #tag-filter {
        flex: 1;
        overflow-y: auto;
    }

    /* フィルター閉じるボタン */
    #filter-close-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        background: none;
        border: none;
        font-size: 1.2rem;
        color: #666;
        cursor: pointer;
        padding: 0.1rem 0.25rem;
        line-height: 1;
    }
    #filter-close-btn:hover {
        color: #333;
    }
}