/*!
 * EPUB 阅读器 — yicool.com.cn /tools/epub-reader
 * 完整复刻 tools.ai225.com/tools/epub-reader 的界面与交互。
 * 外壳配色取自站点主题变量（--accent / --bg-* / --text-* / --border-color）自动适配日夜；
 * 正文阅读区（四套主题）的配色由 epub_reader.js 注入 iframe，不受本文件影响。
 * 断点：≥1100px（目录常驻 + 面板右侧抽屉）/ ≥768px / ≤767px（面板底部弹层）/ ≤480px。
 */

/* ---------- 解除整屏限宽（保留左侧导航） ---------- */
body.page-epub-reader-full .app,
body.page-epub-reader-full .main-content { max-width: 100%; width: 100%; }

.er-app {
    --er-gap: 16px;
    --er-r: 12px;
    --er-bar-h: 54px;
    --er-foot-h: 46px;
    --er-toc-w: 286px;
    --er-panel-w: 348px;
    --er-line: var(--border-color);
    --er-soft: color-mix(in srgb, var(--accent) 10%, transparent);
    display: block;
    max-width: 100%;
    margin: 0;
    padding: 16px 20px 28px;
    box-sizing: border-box;
    color: var(--text-primary);
}
.er-app * { box-sizing: border-box; }
.er-app button { font-family: inherit; }

/* ---------- 通用控件 ---------- */
.er-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 36px;
    padding: 0 14px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: 9px;
    cursor: pointer;
    white-space: nowrap;
    transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.er-btn:hover { border-color: var(--accent); }
.er-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.er-btn[disabled] { opacity: .45; cursor: not-allowed; }
.er-btn[hidden] { display: none !important; }
.er-btn-pri { color: #fff; background: var(--accent); border-color: var(--accent); }
.er-btn-pri:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.er-btn-sec { color: var(--accent); background: var(--er-soft); border-color: color-mix(in srgb, var(--accent) 34%, transparent); }
.er-btn-ghost { background: transparent; }
.er-btn-danger { color: #ef4444; border-color: color-mix(in srgb, #ef4444 40%, transparent); }
.er-btn-danger:hover { background: color-mix(in srgb, #ef4444 10%, transparent); border-color: #ef4444; }
.er-btn-block { width: 100%; }
.er-btn-xs { min-height: 28px; padding: 0 10px; font-size: 12.5px; border-radius: 7px; }

.er-ibtn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    width: 36px;
    height: 36px;
    padding: 0;
    color: var(--text-primary);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 9px;
    cursor: pointer;
    transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.er-ibtn svg { width: 18px; height: 18px; }
.er-ibtn:hover { background: var(--er-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); color: var(--accent); }
.er-ibtn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.er-ibtn.is-on { color: var(--accent); background: var(--er-soft); border-color: color-mix(in srgb, var(--accent) 36%, transparent); }
.er-ibtn-sm { width: 30px; height: 30px; }
.er-ibtn-sm svg { width: 15px; height: 15px; }

.er-input {
    display: block;
    width: 100%;
    min-height: 36px;
    padding: 7px 11px;
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-primary);
    border: 1px solid var(--er-line);
    border-radius: 9px;
}
.er-input::placeholder { color: var(--text-secondary); }
.er-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); }

.er-range {
    -webkit-appearance: none;
    appearance: none;
    display: block;
    width: 100%;
    height: 5px;
    border-radius: 999px;
    background: var(--bg-hover);
    border: 1px solid var(--er-line);
    cursor: pointer;
}
.er-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 17px; height: 17px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-primary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, .28);
    cursor: pointer;
}
.er-range::-moz-range-thumb {
    width: 15px; height: 15px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-primary);
    cursor: pointer;
}
.er-range:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.er-range-sm { width: 104px; }

.er-check {
    display: flex;
    align-items: center;
    gap: 8px;
    min-height: 32px;
    font-size: 13.5px;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
}
.er-check input[type="checkbox"] { flex: 0 0 auto; width: 16px; height: 16px; margin: 0; accent-color: var(--accent); cursor: pointer; }
.er-check:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }

.er-seg { display: flex; flex-wrap: wrap; gap: 6px; }
.er-seg-btn {
    min-height: 32px;
    padding: 0 12px;
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border: 1px solid var(--er-line);
    border-radius: 8px;
    cursor: pointer;
    transition: all .15s ease;
}
.er-seg-btn:hover { color: var(--text-primary); border-color: var(--accent); }
.er-seg-btn.is-on { color: #fff; background: var(--accent); border-color: var(--accent); font-weight: 600; }
.er-seg-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ================= 书架视图 ================= */
.er-shelf { max-width: 1080px; margin: 0 auto; }

.er-drop {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 46px 24px 42px;
    text-align: center;
    background: var(--bg-secondary);
    border: 2px dashed var(--er-line);
    border-radius: 18px;
    cursor: pointer;
    transition: border-color .18s ease, background .18s ease;
}
.er-drop:hover, .er-drop:focus-visible { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 4%, var(--bg-secondary)); outline: none; }
.er-drop:focus-visible { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
.er-drop.is-over { border-color: var(--accent); background: var(--er-soft); }
.er-drop-ico {
    display: flex; align-items: center; justify-content: center;
    width: 62px; height: 62px;
    margin-bottom: 14px;
    border-radius: 18px;
    color: var(--accent);
    background: var(--er-soft);
    border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
}
.er-drop-ico svg { width: 30px; height: 30px; }
.er-drop-title { margin: 0 0 6px; font-size: 19px; font-weight: 700; }
.er-drop-hint { margin: 0 0 12px; font-size: 13.5px; color: var(--text-secondary); }
.er-drop-badge {
    display: inline-block;
    margin-bottom: 16px;
    padding: 2px 10px;
    font-size: 12px;
    font-family: ui-monospace, Consolas, monospace;
    color: var(--accent);
    background: var(--er-soft);
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    border-radius: 999px;
}
.er-drop-browse { min-height: 40px; padding: 0 26px; font-size: 15px; }

.er-shelf-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 26px 0 4px;
}
.er-shelf-title { margin: 0; font-size: 17px; font-weight: 700; }
.er-shelf-note { margin: 0 0 14px; font-size: 12.5px; color: var(--text-secondary); }
.er-shelf-empty {
    padding: 30px 18px;
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    border: 1px dashed var(--er-line);
    border-radius: var(--er-r);
}
.er-shelf-empty[hidden] { display: none !important; }
.er-shelf-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(258px, 1fr)); gap: 14px; }

.er-book {
    display: flex;
    gap: 12px;
    padding: 12px;
    text-align: left;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: var(--er-r);
    cursor: pointer;
    transition: border-color .15s ease, transform .05s ease;
}
.er-book:hover { border-color: var(--accent); }
.er-book:active { transform: translateY(1px); }
.er-book-cover {
    flex: 0 0 auto;
    width: 62px; height: 84px;
    display: flex; align-items: center; justify-content: center;
    overflow: hidden;
    font-size: 24px;
    color: var(--text-secondary);
    background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 16%, var(--bg-primary)), var(--bg-primary));
    border: 1px solid var(--er-line);
    border-radius: 6px;
}
.er-book-cover img { width: 100%; height: 100%; object-fit: cover; }
.er-book-main { flex: 1 1 auto; min-width: 0; }
.er-book-name {
    margin: 0 0 4px;
    font-size: 14.5px; font-weight: 600; line-height: 1.4;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    overflow: hidden;
}
.er-book-meta { margin: 0 0 6px; font-size: 12.5px; color: var(--text-secondary); }
.er-book-prog { height: 5px; border-radius: 999px; background: var(--bg-hover); overflow: hidden; }
.er-book-prog-fill { height: 100%; border-radius: 999px; background: var(--accent); }
.er-book-foot { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: 8px; }
.er-book-pct { font-size: 12px; color: var(--text-secondary); font-variant-numeric: tabular-nums; }
.er-book-del {
    flex: 0 0 auto;
    min-height: 26px; padding: 0 9px;
    font-size: 12px;
    color: #ef4444;
    background: transparent;
    border: 1px solid color-mix(in srgb, #ef4444 38%, transparent);
    border-radius: 7px;
    cursor: pointer;
}
.er-book-del:hover { background: color-mix(in srgb, #ef4444 10%, transparent); }

/* ================= 阅读视图 ================= */
.er-reader { display: flex; flex-direction: column; gap: 10px; }

/* 顶栏 */
.er-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: var(--er-bar-h);
    padding: 7px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: var(--er-r);
}
.er-bar-book { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.er-bar-name { font-size: 14.5px; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.er-bar-chapter { font-size: 12.5px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.er-bar-prog { display: flex; align-items: center; gap: 7px; flex: 0 0 auto; }
.er-bar-prog-track { width: 96px; height: 5px; border-radius: 999px; background: var(--bg-hover); overflow: hidden; }
.er-bar-prog-fill { height: 100%; width: 0; border-radius: 999px; background: var(--accent); }
.er-bar-prog-txt { font-size: 12px; color: var(--text-secondary); font-variant-numeric: tabular-nums; min-width: 34px; }
.er-bar-acts { display: flex; align-items: center; gap: 2px; flex: 0 0 auto; }
.er-bar-sep { width: 1px; height: 20px; margin: 0 5px; background: var(--er-line); }
.er-bar-sep[hidden] { display: none !important; }

/* 主体 */
.er-main { display: flex; gap: 10px; align-items: stretch; min-height: 0; }

/* 目录侧栏 */
.er-toc {
    flex: 0 0 var(--er-toc-w);
    width: var(--er-toc-w);
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: var(--er-r);
    max-height: calc(100dvh - 190px);
}
.er-toc-head { display: flex; align-items: center; gap: 8px; }
.er-toc-title { font-size: 15px; font-weight: 700; }
.er-toc-count { font-size: 12px; color: var(--text-secondary); }
.er-toc-head .er-ibtn { margin-left: auto; }
.er-toc-tree { flex: 1 1 auto; overflow-y: auto; overscroll-behavior: contain; margin: 0 -4px; padding: 0 4px; }
.er-toc-empty { padding: 18px 10px; text-align: center; font-size: 13px; color: var(--text-secondary); }
.er-toc-empty[hidden] { display: none !important; }
.er-toc-mask { display: none; }

.er-toc-i {
    display: block;
    width: 100%;
    text-align: left;
    padding: 6px 9px;
    font-size: 13.5px;
    line-height: 1.5;
    color: var(--text-primary);
    background: transparent;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 7px;
    cursor: pointer;
    transition: background .13s ease, color .13s ease;
}
.er-toc-i:hover { background: var(--bg-hover); }
.er-toc-i.is-cur { color: var(--accent); background: var(--er-soft); border-left-color: var(--accent); font-weight: 600; }
.er-toc-i:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.er-toc-i[data-d="1"] { padding-left: 20px; }
.er-toc-i[data-d="2"] { padding-left: 32px; }
.er-toc-i[data-d="3"] { padding-left: 44px; font-size: 13px; }
.er-toc-i[data-d="4"] { padding-left: 56px; font-size: 13px; }
.er-toc-i[data-d="5"] { padding-left: 68px; font-size: 12.5px; }

/* 阅读舞台 */
.er-stage {
    position: relative;
    flex: 1 1 auto;
    min-width: 0;
    height: calc(100dvh - 190px);
    min-height: 380px;
    background: var(--bg-primary);
    border: 1px solid var(--er-line);
    border-radius: var(--er-r);
    overflow: hidden;
}
.er-frame { display: block; width: 100%; height: 100%; border: 0; background: transparent; }
.er-frame[hidden] { display: none !important; }
.er-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    background: var(--bg-primary);
    z-index: 3;
}
.er-loading[hidden] { display: none !important; }
.er-spin {
    width: 18px; height: 18px;
    border: 2px solid color-mix(in srgb, var(--accent) 30%, transparent);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: er-spin .8s linear infinite;
}
@keyframes er-spin { to { transform: rotate(360deg); } }

/* 划线颜色浮层 */
.er-hl-pop {
    position: absolute;
    z-index: 6;
    display: flex;
    gap: 6px;
    padding: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: 999px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
}
.er-hl-pop[hidden] { display: none !important; }
.er-hl-dot {
    width: 24px; height: 24px;
    padding: 0;
    background: var(--c);
    border: 2px solid transparent;
    border-radius: 50%;
    cursor: pointer;
    transition: transform .12s ease, border-color .12s ease;
}
.er-hl-dot:hover { transform: scale(1.14); border-color: var(--bg-primary); }
.er-hl-dot:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* 底栏 */
.er-foot {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    min-height: var(--er-foot-h);
    padding: 6px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: var(--er-r);
}
.er-foot-info { font-size: 13.5px; color: var(--text-secondary); font-variant-numeric: tabular-nums; min-width: 108px; text-align: center; }

/* ================= 面板 ================= */
.er-panel {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    z-index: 120000;
    display: flex;
    flex-direction: column;
    width: var(--er-panel-w);
    max-width: 100%;
    background: var(--bg-primary);
    border-left: 1px solid var(--er-line);
    box-shadow: -12px 0 34px rgba(0, 0, 0, .16);
}
.er-panel[hidden] { display: none !important; }
.er-panel-head {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 0 0 auto;
    padding: 13px 14px;
    border-bottom: 1px solid var(--er-line);
}
.er-panel-title { font-size: 15.5px; font-weight: 700; }
.er-panel-head .er-ibtn { margin-left: auto; }
.er-panel-body { flex: 1 1 auto; overflow-y: auto; overscroll-behavior: contain; padding: 14px; }
.er-panel-hint { margin: 10px 0 0; font-size: 12.5px; color: var(--text-secondary); line-height: 1.6; }
.er-sub-sec { margin-top: 18px; }
.er-sub-sec:first-child { margin-top: 0; }
.er-sub-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-secondary);
}

/* 搜索 */
.er-search-row { display: flex; gap: 7px; }
.er-search-row .er-input { flex: 1 1 auto; }
.er-search-meta { margin: 9px 0 0; font-size: 12.5px; color: var(--text-secondary); }
.er-search-list { display: flex; flex-direction: column; gap: 7px; margin-top: 10px; }
.er-hit {
    display: block;
    width: 100%;
    text-align: left;
    padding: 9px 11px;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-radius: 9px;
    cursor: pointer;
    transition: border-color .14s ease;
}
.er-hit:hover { border-color: var(--accent); }
.er-hit.is-cur { border-color: var(--accent); background: var(--er-soft); }
.er-hit:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.er-hit-ch { margin: 0 0 3px; font-size: 12.5px; font-weight: 600; color: var(--accent); }
.er-hit-tx { margin: 0; font-size: 13px; line-height: 1.6; color: var(--text-primary); word-break: break-word; }
.er-hit-tx mark { background: color-mix(in srgb, #facc15 55%, transparent); color: inherit; border-radius: 2px; padding: 0 1px; }

/* 设置 */
.er-set-row { margin-bottom: 15px; }
.er-set-lb { display: block; margin-bottom: 7px; font-size: 13px; color: var(--text-secondary); }
.er-set-lb b { color: var(--accent); font-variant-numeric: tabular-nums; }
.er-shortcuts { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--er-line); }
.er-shortcuts-t { font-size: 13px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.er-shortcuts-k { font-size: 12px; line-height: 1.9; color: var(--text-secondary); word-break: break-word; }

/* 标记 */
.er-mark-colors { display: flex; gap: 7px; margin-bottom: 9px; }
.er-mark-list { display: flex; flex-direction: column; gap: 7px; }
.er-mark {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    padding: 9px 11px;
    background: var(--bg-secondary);
    border: 1px solid var(--er-line);
    border-left: 3px solid var(--mc, var(--accent));
    border-radius: 9px;
}
.er-mark-main { flex: 1 1 auto; min-width: 0; }
.er-mark-ch { margin: 0 0 2px; font-size: 12.5px; font-weight: 600; color: var(--accent); }
.er-mark-tx { margin: 0; font-size: 13px; line-height: 1.6; color: var(--text-primary); word-break: break-word; }
.er-mark-del {
    flex: 0 0 auto;
    width: 26px; height: 26px;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 7px;
    cursor: pointer;
}
.er-mark-del:hover { color: #ef4444; border-color: color-mix(in srgb, #ef4444 40%, transparent); }
.er-mark-del:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.er-mark-del svg { width: 14px; height: 14px; }
.er-mark-empty { padding: 16px 10px; text-align: center; font-size: 13px; color: var(--text-secondary); }
.er-mark-empty[hidden] { display: none !important; }

/* 信息 */
.er-meta { margin: 0; }
.er-meta-row { display: flex; gap: 10px; padding: 6px 0; border-bottom: 1px dashed var(--er-line); font-size: 13.5px; }
.er-meta-row:last-child { border-bottom: 0; }
.er-meta-k { flex: 0 0 76px; color: var(--text-secondary); }
.er-meta-v { flex: 1 1 auto; min-width: 0; word-break: break-word; }
.er-warns { margin-top: 14px; display: flex; flex-direction: column; gap: 6px; }
.er-warn {
    padding: 8px 11px;
    font-size: 12.5px;
    line-height: 1.6;
    color: #b45309;
    background: color-mix(in srgb, #f59e0b 12%, transparent);
    border: 1px solid color-mix(in srgb, #f59e0b 34%, transparent);
    border-radius: 8px;
}

/* ================= 弹窗 / Toast ================= */
.er-modal {
    position: fixed;
    inset: 0;
    z-index: 130000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, .5);
}
.er-modal[hidden] { display: none !important; }
.er-modal-card {
    width: 100%;
    max-width: 400px;
    padding: 20px;
    background: var(--bg-primary);
    border: 1px solid var(--er-line);
    border-radius: 14px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, .3);
}
.er-modal-title { margin: 0 0 8px; font-size: 16.5px; font-weight: 700; }
.er-modal-desc { margin: 0 0 18px; font-size: 13.5px; line-height: 1.7; color: var(--text-secondary); }
.er-modal-foot { display: flex; gap: 9px; justify-content: flex-end; }

.er-toasts {
    position: fixed;
    left: 50%;
    bottom: 26px;
    z-index: 140000;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}
.er-toast {
    max-width: 84vw;
    padding: 9px 17px;
    font-size: 13.5px;
    color: #fff;
    background: rgba(0, 0, 0, .88);
    border-radius: 999px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .26);
    animation: er-toast-in .18s ease-out;
}
@keyframes er-toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ================= 全屏阅读 ================= */
body.er-fs .er-app { padding: 0; }
body.er-fs .er-shelf { display: none !important; }
body.er-fs .er-reader { height: 100dvh; gap: 0; }
body.er-fs .er-bar,
body.er-fs .er-foot { border-radius: 0; border-left: 0; border-right: 0; }
body.er-fs .er-bar { border-top: 0; }
body.er-fs .er-foot { border-bottom: 0; }
body.er-fs .er-main { flex: 1 1 auto; min-height: 0; gap: 0; }
body.er-fs .er-stage { height: auto; border-radius: 0; border-left: 0; border-right: 0; }
body.er-fs .er-toc {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 120000;
    max-height: none;
    border-radius: 0;
    border-top: 0; border-bottom: 0; border-left: 0;
    box-shadow: 12px 0 34px rgba(0, 0, 0, .18);
}
body.er-fs .er-toc-mask { display: block; position: fixed; inset: 0; z-index: 119000; background: rgba(0, 0, 0, .42); }

/* ================= 响应式 ================= */

/* 桌面：目录常驻 */
@media (min-width: 1100px) {
    .er-toc-mask { display: none !important; }
}

/* 平板及以下：目录改为抽屉 */
@media (max-width: 1099px) {
    .er-toc {
        position: fixed;
        top: 0; left: 0; bottom: 0;
        z-index: 120000;
        max-height: none;
        border-radius: 0;
        border-top: 0; border-bottom: 0; border-left: 0;
        box-shadow: 12px 0 34px rgba(0, 0, 0, .2);
        transform: translateX(-102%);
        transition: transform .22s ease-out;
    }
    body.er-toc-open .er-toc { transform: none; }
    .er-toc-mask {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 119000;
        background: rgba(0, 0, 0, .42);
    }
    .er-toc-mask[hidden] { display: none !important; }
    body.er-toc-open { overflow: hidden; }
}

/* 平板：加大留白与高度 */
@media (min-width: 768px) {
    .er-app { padding: 18px 24px 32px; }
    .er-stage { height: calc(100dvh - 200px); }
    .er-toc { max-height: calc(100dvh - 200px); }
}

/* 手机：面板贴底，控件加大 */
@media (max-width: 767px) {
    .er-app { padding: 12px 12px 20px; --er-gap: 12px; }
    .er-drop { padding: 32px 16px 30px; border-radius: 14px; }
    .er-drop-ico { width: 54px; height: 54px; }
    .er-drop-ico svg { width: 26px; height: 26px; }
    .er-drop-title { font-size: 17px; }
    .er-drop-browse { min-height: 44px; width: 100%; max-width: 320px; }
    .er-shelf-list { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 11px; }

    /* 顶栏两行：信息行 + 操作行 */
    .er-bar { flex-wrap: wrap; gap: 8px; padding: 8px 9px; }
    .er-bar-book { order: 1; flex: 1 1 auto; min-width: 0; }
    .er-bar-prog { order: 2; }
    .er-bar-acts { order: 3; flex: 1 1 100%; justify-content: space-between; gap: 4px; overflow-x: auto; padding-top: 6px; border-top: 1px solid var(--er-line); }
    .er-bar-acts .er-ibtn { width: 40px; height: 40px; }
    .er-bar-acts .er-bar-sep { margin: 0 2px; }

    .er-stage { height: calc(100dvh - 268px); min-height: 300px; }
    .er-toc { width: min(84vw, 320px); }

    /* 面板改为底部弹层 */
    .er-panel {
        top: auto;
        left: 0; right: 0; bottom: 0;
        width: 100%;
        max-height: 84dvh;
        border-left: 0;
        border-top: 1px solid var(--er-line);
        border-radius: 16px 16px 0 0;
        box-shadow: 0 -12px 34px rgba(0, 0, 0, .2);
    }
    .er-panel-head { padding: 14px 15px; }
    .er-panel-body { padding: 15px; padding-bottom: calc(15px + env(safe-area-inset-bottom, 0px)); }
    .er-input, .er-seg-btn { font-size: 16px; }
    .er-input { min-height: 44px; }
    .er-seg-btn { min-height: 40px; flex: 1 1 auto; }
    .er-check { min-height: 40px; }
    .er-panel-head .er-ibtn { width: 36px; height: 36px; }

    /* 底栏两行 */
    .er-foot { gap: 7px; padding: 8px 10px; }
    .er-foot .er-btn { min-height: 40px; }
    .er-foot-info { min-width: 96px; }
    .er-rate-sep { flex: 1 1 100%; display: flex; justify-content: center; margin: 2px 0 0; width: 100%; height: auto; background: none; }
    .er-range-sm { width: min(240px, 70vw); }
}

@media (max-width: 480px) {
    .er-app { padding: 10px 10px 18px; }
    .er-bar-prog-track { width: 62px; }
    .er-shelf-list { grid-template-columns: minmax(0, 1fr); }
    .er-foot-info { min-width: 100%; order: -1; }
    .er-modal-card { padding: 18px 16px; }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
    .er-app *, .er-app { transition: none !important; animation: none !important; }
    .er-spin { animation: none !important; }
}