/* 文件下載頁：電子書式線上預覽（home/download.html 專用）
   頁面 extends base2.html（body.benq-flat），var(--benq-*) 必有值。
   翻頁元件 StPageFlip 會自行注入 .stf__* 基礎樣式，這裡只處理外框與頁面內容。 */

.doc-reader-modal .modal-content.doc-reader {
    display: flex;
    flex-direction: column;
    background: #1d1f26;
    border: 0;
    border-radius: 0;
    color: #fff;
}

/* ---------- 頂部工具列 ---------- */
.doc-reader-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.625rem 1rem;
    background: var(--benq-bg);
    color: var(--benq-text);
    border-bottom: 1px solid var(--benq-border);
    flex-shrink: 0;
}

.doc-reader-heading {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    min-width: 0;
}

.doc-reader-heading > i {
    font-size: 1.25rem;
    color: var(--benq-pri);
    flex-shrink: 0;
}

.doc-reader-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-reader-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-shrink: 0;
}

.benq-flat .doc-reader-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid transparent;
    border-radius: var(--benq-radius-sm);
    background: transparent;
    color: inherit;
    font-size: 1.125rem;
    text-decoration: none;
    transition: background 0.15s ease, color 0.15s ease;
}

.benq-flat .doc-reader-icon-btn:hover,
.benq-flat .doc-reader-icon-btn:focus-visible {
    background: var(--benq-pri-light);
    color: var(--benq-pri);
}

.benq-flat .doc-reader-icon-btn:disabled {
    opacity: 0.35;
    pointer-events: none;
}

/* ---------- 閱讀區（書桌） ---------- */
.doc-reader-stage {
    position: relative;
    flex: 1 1 auto;
    min-height: 0;
    padding: 1.5rem;
    background:
        radial-gradient(ellipse at center, rgba(255, 255, 255, 0.06) 0%, rgba(255, 255, 255, 0) 70%),
        #1d1f26;
}

.doc-reader-book-host {
    position: absolute;
    inset: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.doc-reader-frame {
    flex: 0 0 auto;
    filter: drop-shadow(0 18px 32px rgba(0, 0, 0, 0.45));
    transition: transform 0.35s ease;
}

@media (prefers-reduced-motion: reduce) {
    .doc-reader-frame {
        transition: none;
    }
}

.reader-page {
    background: #fff;
    overflow: hidden;
}

.reader-page-inner {
    position: relative;
    width: 100%;
    height: 100%;
}

/* 書脊陰影：左頁右緣、右頁左緣各一道漸層，讓雙頁看起來像攤開的書 */
.reader-page.--left .reader-page-inner::after,
.reader-page.--right .reader-page-inner::after {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    width: 6%;
    pointer-events: none;
}

.reader-page.--left .reader-page-inner::after {
    right: 0;
    background: linear-gradient(to left, rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0));
}

.reader-page.--right .reader-page-inner::after {
    left: 0;
    background: linear-gradient(to right, rgba(0, 0, 0, 0.12), rgba(0, 0, 0, 0));
}

.reader-page-canvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* 尚未渲染：頁碼 + 微光掃過 */
.reader-page-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: #d1d5db;
    background: linear-gradient(100deg, #f9fafb 30%, #f3f4f6 50%, #f9fafb 70%);
    background-size: 300% 100%;
    animation: reader-shimmer 1.4s linear infinite;
}

.reader-page.is-rendered .reader-page-placeholder {
    display: none;
}

@keyframes reader-shimmer {
    from { background-position: 100% 0; }
    to { background-position: 0 0; }
}

/* ---------- 載入 / 錯誤狀態 ---------- */
.doc-reader-status {
    position: absolute;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 1.5rem;
    text-align: center;
}

.doc-reader-progress {
    width: min(320px, 70%);
    height: 4px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.15);
    overflow: hidden;
}

.doc-reader-progress-bar {
    width: 0;
    height: 100%;
    background: var(--benq-pri);
    transition: width 0.2s ease;
}

.doc-reader-status-text {
    margin: 0;
    color: rgba(255, 255, 255, 0.75);
}

.doc-reader-status.is-error .doc-reader-progress {
    display: none;
}

.benq-flat .doc-reader-status .doc-reader-fallback {
    width: auto;
}

/* ---------- 底部翻頁列 ---------- */
.doc-reader-nav {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 0.625rem 1rem calc(0.625rem + env(safe-area-inset-bottom, 0px));
    background: #15171d;
    color: #fff;
    flex-shrink: 0;
}

.benq-flat .doc-reader-nav .doc-reader-icon-btn:hover,
.benq-flat .doc-reader-nav .doc-reader-icon-btn:focus-visible {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

.doc-reader-nav-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    background: transparent;
    color: #fff;
    font-size: 1.25rem;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.doc-reader-nav-btn:hover,
.doc-reader-nav-btn:focus-visible {
    background: var(--benq-pri);
    border-color: var(--benq-pri);
}

.doc-reader-nav-btn:disabled {
    opacity: 0.3;
    pointer-events: none;
}

.doc-reader-page-indicator {
    min-width: 7.5rem;
    text-align: center;
    font-variant-numeric: tabular-nums;
    font-size: 0.9375rem;
}

.doc-reader-hint {
    position: absolute;
    right: 1rem;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.5);
}

/* 全螢幕時 .doc-reader 是 fullscreen element */
.doc-reader:fullscreen {
    width: 100vw;
    height: 100vh;
}

@media (max-width: 767.98px) {
    .doc-reader-stage {
        padding: 0.75rem;
    }

    .doc-reader-book-host {
        inset: 0.75rem;
    }

    .doc-reader-toolbar {
        padding: 0.5rem 0.75rem;
    }

    .doc-reader-page-indicator {
        min-width: 5.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .reader-page-placeholder {
        animation: none;
    }
}