/* Coreside E-Book Viewer - Frontend Styles (Flat & Transparent Viewport, Dark Menus) */

.coreside-ebook-viewer {
    position: relative;
    display: flex;
    flex-direction: column;
    background: transparent; /* 黒枠をなくすために背景を透明に */
    border-radius: 0px;
    overflow: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    height: 600px;
    max-height: 85vh;
    width: 100%;
    margin: 20px auto;
    color: #fff;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none;
    border: none; /* 外枠を非表示に */
}

/* 全画面モード (読書に集中するため全画面では背景をダークに) */
.coreside-ebook-viewer:fullscreen {
    width: 100vw !important;
    height: 100vh !important;
    max-height: 100vh !important;
    border-radius: 0 !important;
    margin: 0 !important;
    background: #000;
}

.coreside-ebook-viewer:-webkit-full-screen {
    width: 100vw !important;
    height: 100vh !important;
    max-height: 100vh !important;
    border-radius: 0 !important;
    margin: 0 !important;
    background: #000;
}

/* ビューポート（ページ表示領域） */
.coreside-ebook-viewer .ebook-viewport {
    position: relative;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: transparent; /* 黒枠を排除しフラットにするため背景を透明に */
    cursor: default;
}

.coreside-ebook-viewer:fullscreen .ebook-viewport,
.coreside-ebook-viewer:-webkit-full-screen .ebook-viewport {
    background: #0d0d0d;
}

.coreside-ebook-viewer .ebook-canvas-container {
    display: flex;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* ページスロット */
.coreside-ebook-viewer .ebook-page-slot {
    flex: 1 1 50%;
    width: 50%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    padding: 10px 20px;
    transition: opacity 0.25s ease-in-out;
    opacity: 1;
}

.coreside-ebook-viewer .ebook-page-slot.is-empty {
    display: none !important;
}

/* 画像クリック時のリンク (アフィリエイトリンク用) */
.coreside-ebook-viewer .ebook-page-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    cursor: pointer;
    text-decoration: none;
    outline: none;
    backface-visibility: hidden;
}

.coreside-ebook-viewer .ebook-page-link img,
.coreside-ebook-viewer .ebook-page-link canvas {
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.25, 0.8, 0.25, 1), border-color 0.2s;
}

/* ホバー時の極小拡大と境界線アニメーション */
.coreside-ebook-viewer .ebook-page-link:hover img,
.coreside-ebook-viewer .ebook-page-link:hover canvas {
    transform: scale(1.015);
    border-color: #0073aa;
}

/* スマホ用単一ページ表示 */
@media (max-width: 767px) {
    .coreside-ebook-viewer .ebook-page-slot {
        flex: 1 1 100%;
        width: 100%;
        padding: 5px 10px;
    }
}

/* 画像とキャンバスのサイズフィッティング (影を無くしフラットな極細境界線に) */
.coreside-ebook-viewer .ebook-page-slot img,
.coreside-ebook-viewer .ebook-page-slot canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    background: #fff;
    border-radius: 2px;
    border: 1px solid #e2e8f0; /* フラットなグレーの極細ボーダー */
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05); /* 影は極小に */
    backface-visibility: hidden;
}

/* タップ領域と矢印オーバーレイ */
.coreside-ebook-viewer .ebook-tap-area {
    position: absolute;
    top: 0;
    width: 25%;
    height: 100%;
    z-index: 5;
    cursor: pointer;
    background: transparent;
    display: flex;
    align-items: center;
}

.coreside-ebook-viewer .ebook-tap-area.area-prev {
    left: 0;
    justify-content: flex-start;
}

.coreside-ebook-viewer .ebook-tap-area.area-next {
    right: 0;
    justify-content: flex-end;
}

/* 矢印オーバーレイ本体 (フラットダーク円) */
.coreside-ebook-viewer .ebook-arrow-overlay {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(30, 30, 30, 0.7);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    opacity: 0; /* 初期状態は非表示 */
    transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.25, 0.8, 0.25, 1), background-color 0.2s;
    pointer-events: none; /* クリックイベントは親のタップ領域に通す */
}

/* ビューアの上にマウスが載った時、矢印を薄く表示 */
.coreside-ebook-viewer:hover .ebook-arrow-overlay {
    opacity: 0.35;
}

/* タップ領域（画面端の25%）にマウスが近づいた時、その側の矢印を強調 */
.coreside-ebook-viewer .ebook-tap-area:hover .ebook-arrow-overlay {
    opacity: 0.9;
    background-color: #1e1e1e;
}

.coreside-ebook-viewer .ebook-tap-area.area-prev .ebook-arrow-overlay {
    margin-left: 20px;
    transform: translateX(-10px);
}

.coreside-ebook-viewer .ebook-tap-area.area-next .ebook-arrow-overlay {
    margin-right: 20px;
    transform: translateX(10px);
}

.coreside-ebook-viewer .ebook-tap-area.area-prev:hover .ebook-arrow-overlay {
    transform: translateX(0px);
}

.coreside-ebook-viewer .ebook-tap-area.area-next:hover .ebook-arrow-overlay {
    transform: translateX(0px);
}

/* メニューが非表示になっているときは、矢印も強制的に非表示にする */
.coreside-ebook-viewer.controls-hidden .ebook-arrow-overlay {
    opacity: 0 !important;
}

/* ローディングオーバーレイ (ライト背景・ダーク背景両対応) */
.coreside-ebook-viewer .ebook-loading {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    color: #2d3748;
}

.coreside-ebook-viewer:fullscreen .ebook-loading,
.coreside-ebook-viewer:-webkit-full-screen .ebook-loading {
    background: rgba(13, 13, 13, 0.85);
    color: #fff;
}

.coreside-ebook-viewer .ebook-loading.active {
    opacity: 1;
    pointer-events: auto;
}

.coreside-ebook-viewer .ebook-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 0, 0, 0.08);
    border-top-color: #0073aa;
    border-radius: 50%;
    animation: ebook-spin 0.8s linear infinite;
    margin-bottom: 12px;
}

.coreside-ebook-viewer:fullscreen .ebook-spinner,
.coreside-ebook-viewer:-webkit-full-screen .ebook-spinner {
    border: 3px solid rgba(255, 255, 255, 0.15);
    border-top-color: #fff;
}

.coreside-ebook-viewer .ebook-loading-text {
    font-size: 14px;
    color: #4a5568;
    font-weight: 500;
}

.coreside-ebook-viewer:fullscreen .ebook-loading-text,
.coreside-ebook-viewer:-webkit-full-screen .ebook-loading-text {
    color: #ccc;
}

@keyframes ebook-spin {
    to { transform: rotate(360deg); }
}

/* --- 下部コントロールバー (フラット＆ダークカプセル設計) --- */
.coreside-ebook-viewer .ebook-controls {
    position: absolute;
    bottom: 16px; /* ビューア底面から少し浮かせる */
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 32px); /* 左右にマージン */
    max-width: 800px;
    z-index: 20;
    padding: 12px 24px;
    box-sizing: border-box;
    background: #1e1e1e; /* クリーンなフラットチャコールブラック */
    border: 1px solid rgba(255, 255, 255, 0.08); /* 極薄の白枠 */
    border-radius: 12px; /* カプセル型に角丸 */
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25); /* 浮かせるためのダークな影 */
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.3s ease;
    opacity: 1;
    color: #ffffff;
}

/* 全画面モード時のコントロールバー */
.coreside-ebook-viewer:fullscreen .ebook-controls,
.coreside-ebook-viewer:-webkit-full-screen .ebook-controls {
    bottom: 24px;
    background: rgba(30, 30, 30, 0.95);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

/* オートハイド用非表示クラス */
.coreside-ebook-viewer.controls-hidden .ebook-controls {
    transform: translate(-50%, calc(100% + 24px)); /* カプセルの高さ分押し出す */
    opacity: 0;
    pointer-events: none;
}

.coreside-ebook-viewer .ebook-controls-inner {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

/* プログレスバー・スライダーコンテナ */
.coreside-ebook-viewer .ebook-progress-container {
    position: relative;
    width: 100%;
    height: 18px;
    display: flex;
    align-items: center;
    cursor: pointer;
}

/* レンジスライダーのカスタムスタイル */
.coreside-ebook-viewer .ebook-progress-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 5px;
    background: rgba(255, 255, 255, 0.2); /* 半透明の白トラック */
    border-radius: 3px;
    outline: none;
    margin: 0;
    z-index: 2;
    cursor: pointer;
}

/* スライダーつまみ (Chrome, Safari, Edge) */
.coreside-ebook-viewer .ebook-progress-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: #0073aa; /* アクセントカラーの青 */
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
    border: 2px solid #fff; /* つまみの白フチ */
}

.coreside-ebook-viewer .ebook-progress-slider::-webkit-slider-thumb:hover {
    transform: scale(1.25);
    background: #005177;
}

/* スライダーつまみ (Firefox) */
.coreside-ebook-viewer .ebook-progress-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border: 2px solid #fff;
    border-radius: 50%;
    background: #0073aa;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    cursor: pointer;
    transition: transform 0.15s ease, background 0.15s ease;
}

.coreside-ebook-viewer .ebook-progress-slider::-moz-range-thumb:hover {
    transform: scale(1.25);
    background: #005177;
}

/* 進捗インジケーター（色塗りつぶし） */
.coreside-ebook-viewer .ebook-progress-bar-fill {
    position: absolute;
    left: 0;
    height: 5px;
    background: #0073aa;
    border-radius: 3px;
    pointer-events: none;
    z-index: 1;
    width: 0%;
}

/* RTL (右から左) の場合の progress バー反転 */
.coreside-ebook-viewer.direction-rtl .ebook-progress-slider {
    transform: scaleX(-1);
}

.coreside-ebook-viewer.direction-rtl .ebook-progress-bar-fill {
    right: 0;
    left: auto;
}

/* ナビゲーション行レイアウト */
.coreside-ebook-viewer .ebook-navigation-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.coreside-ebook-viewer .ebook-nav-left,
.coreside-ebook-viewer .ebook-nav-right {
    flex: 1;
    display: flex;
}

.coreside-ebook-viewer .ebook-nav-right {
    justify-content: flex-end;
}

.coreside-ebook-viewer .ebook-nav-center {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* コントロール用ボタン */
.coreside-ebook-viewer .ebook-btn {
    background: none;
    border: none;
    color: #cbd5e0; /* 明るいグレー */
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.1s, color 0.2s;
}

.coreside-ebook-viewer .ebook-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.coreside-ebook-viewer .ebook-btn:active {
    transform: scale(0.92);
}

.coreside-ebook-viewer .ebook-btn:disabled {
    opacity: 0.25;
    cursor: not-allowed;
    background: transparent !important;
    color: rgba(255, 255, 255, 0.2) !important;
}

.coreside-ebook-viewer .ebook-btn svg {
    display: block;
}

/* ページインフォメーション */
.coreside-ebook-viewer .ebook-page-info {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: #eee;
    background: rgba(255, 255, 255, 0.06); /* 半透明ブラックの背景 */
    padding: 5px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.coreside-ebook-viewer .ebook-page-separator {
    color: rgba(255, 255, 255, 0.3);
}

.coreside-ebook-viewer .ebook-total-pages {
    color: #cbd5e0;
}

.coreside-ebook-viewer .icon-fs-exit {
    display: none;
}