:root{color-scheme:light;--paper:#f5f1e8;--card:#fffdf6;--ink:#262820;--muted:#666858;--accent:#b33e26;--line:#cbc7b9;--tint:#efe9dc;--pane:#ebe5d7;/* 舊主題相容別名 */--blue:var(--accent);--orange:#8a5a1e}
*{box-sizing:border-box}
body{margin:0;color:var(--ink);background:var(--paper);font-family:system-ui,-apple-system,"PingFang TC",sans-serif}
header{max-width:1160px;margin:auto;padding:24px 32px;display:flex;justify-content:space-between;gap:20px;font-size:14px;color:var(--muted)}
a{color:var(--accent)}
main{max-width:1060px;margin:auto;padding:25px 32px 115px}
.chapter{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.08em}
h1{font-size:clamp(30px,4.7vw,49px);line-height:1.3;letter-spacing:-.035em;margin:12px 0 18px;max-width:900px}
.lead{font-size:clamp(18px,2vw,22px);line-height:1.8;max-width:820px;min-height:80px;margin:0}
.stage{margin:24px 0;background:var(--card);border:1px solid var(--line);border-radius:2px;min-height:300px;padding:32px;display:flex;flex-direction:column;justify-content:center;gap:25px}
.question{font-size:21px;line-height:1.6;margin:0}
.choices{display:flex;gap:12px;flex-wrap:wrap}
button{font:inherit;cursor:pointer;border:1px solid var(--line);border-radius:7px;padding:12px 18px;background:var(--card);color:var(--ink)}
/* :where 讓 hover 不蓋過主題或元件以類別設定的按鈕底色（docs/adr/0021） */
:where(button):hover{border-color:var(--accent);background:var(--tint)}
button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}
button:disabled{opacity:.35;cursor:default}
.feedback{font-size:17px;line-height:1.7;min-height:58px;color:var(--ink);font-weight:600}
.point{font-size:20px;line-height:1.7;padding-left:20px;border-left:3px solid var(--accent);margin:24px 0}
.detail{color:var(--muted);font-size:15px;line-height:1.8}
nav{position:fixed;bottom:0;background:#f5f1e8f5;border-top:1px solid var(--line);width:100%;backdrop-filter:blur(10px)}
.nav-inner{max-width:1060px;margin:auto;padding:16px 32px;display:flex;align-items:center;gap:12px}
.progress{flex:1;font-size:14px;color:var(--muted)}
progress{display:block;width:100%;max-width:240px;height:4px;margin-top:8px;accent-color:var(--accent)}
#next{background:var(--accent);color:var(--paper);border-color:var(--accent)}
@media(max-width:600px){
header{padding:18px 20px}
main{padding:12px 20px 130px}
.stage{padding:22px 18px;gap:22px}
.lead{min-height:0}
.nav-inner{padding:14px 20px}
.progress{min-width:65px}
.point{font-size:18px}
}
@media(prefers-reduced-motion:no-preference){
.stage{animation:arrive .25s ease-out}
@keyframes arrive{from{opacity:.4;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
}
/* 預覽共用頁面標記，以 CSS 縮放；不載入額外圖片。 */
main{padding-bottom:210px}
.nav-inner{display:grid;grid-template-columns:minmax(0,1fr) 90px 46px minmax(0,1fr);gap:22px;max-width:1160px}
.progress{text-align:center;min-width:0}
.preview{display:flex;align-items:center;gap:15px;text-align:left;min-width:0;padding:12px;background:var(--card)}
.preview-copy{min-width:0}
.preview-copy>small{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
.preview strong{font-size:15px;line-height:1.5;display:block}
#next.preview{background:var(--card);color:var(--ink);border-color:var(--line)}
.preview:not(:disabled):hover,.preview:focus-visible{background:var(--tint);box-shadow:0 3px 12px #26282012}
#prev{grid-column:1;grid-row:1}
.progress{grid-column:2;grid-row:1}
#zoom{grid-column:3;grid-row:1}
#next{grid-column:4;grid-row:1}
@media(max-width:700px){
main{padding-bottom:165px}
.nav-inner{gap:9px;padding:12px}
.preview{padding:10px;min-height:86px}
.preview strong{font-size:13px}
.preview-copy>small{font-size:12px}
.nav-inner{grid-template-columns:minmax(0,1fr) 50px 38px minmax(0,1fr)}
}
.mini-page{position:absolute;top:0;left:0;width:1000px;padding:28px 32px;transform:scale(.16);transform-origin:top left;pointer-events:none;text-align:left}
.mini-page h1{font-size:42px;margin:12px 0 18px}
.mini-page .lead{font-size:20px;min-height:80px}
.mini-page .stage{padding:28px;min-height:300px;margin:24px 0;gap:22px;animation:none}
.mini-page .point{font-size:20px}
.mini-page .choice-copy{padding:12px 18px;border:1px solid var(--line);border-radius:7px;font-size:16px}
.mini-placeholder{display:grid;place-items:center;height:100%;font-size:25px}
.preview{min-height:154px}
.mini-page .feedback{min-height:0}
.mini-page .detail{font-size:15px}
.mini-page .chapter{font-size:14px}
@media(max-width:700px){
.preview{min-height:86px}
}
nav{z-index:10}
.preview{position:relative;transform-origin:center bottom}
@media(prefers-reduced-motion:no-preference){
.preview{transition:transform .18s ease,box-shadow .18s ease}
}
/* 放大按鈕：圓形圖示鈕，與上一步/下一步同排。 */
#zoom{width:46px;height:46px;align-self:center;padding:0;display:grid;place-items:center;font-size:18px;line-height:1;border-radius:50%;background:var(--card)}
#zoom[aria-pressed=true]{background:var(--accent);color:var(--paper);border-color:var(--accent)}
@media(max-width:700px){#zoom{width:38px;height:38px;font-size:15px}}
/* 放大模式：全螢幕播放 + 內文縮放，不影響資料與互動邏輯。 */
body.is-zoomed main{zoom:1.35}
@supports not (zoom:1){
body.is-zoomed main{transform:scale(1.35);transform-origin:top center;width:74.07%;margin-inline:auto}
}
body.is-zoomed header,body.is-zoomed nav{zoom:1}
:fullscreen{background:var(--paper)}
@media(max-width:700px){
body.is-zoomed main{zoom:1.15}
@supports not (zoom:1){body.is-zoomed main{transform:scale(1.15);width:86.96%}}
}
/* 固定高度的導覽；各頁縮圖由拖動軸在上方浮出，不推擠內容。 */
body>main{padding-bottom:calc(var(--reader-nav-height,80px) + 24px)}
body>nav .nav-inner{max-width:660px;padding:10px 16px 18px;gap:12px;grid-template-columns:minmax(0,1fr) 64px auto minmax(0,1fr)}
body>nav .preview{min-height:40px;padding:8px 12px;transform:none;justify-content:center;border-radius:8px}
body>nav .preview strong{display:none}
body>nav .preview-copy>small{margin:0;font-size:14px}
body>nav #zoom{width:40px;height:40px;border-radius:8px}
@media(max-width:400px){body>nav .nav-inner{gap:6px;padding-inline:8px;grid-template-columns:minmax(0,1fr) 44px auto minmax(0,1fr)}body>nav .preview{padding-inline:6px}}
/* 導覽列空白處也能翻頁（reader.js）：左半上一頁、右半下一頁。 */
body>nav{cursor:pointer}
body>nav .progress{cursor:default}
.made-with{position:absolute;right:12px;bottom:2px;font-size:10px;line-height:1;color:var(--muted);text-decoration:none;opacity:.6}
.made-with:hover,.made-with:focus-visible{color:var(--accent);opacity:1;text-decoration:underline}

/* 原生對話框提供焦點限制與 Escape；僅內容區捲動。 */
#reader-settings{width:min(560px,calc(100vw - 32px));max-height:calc(100dvh - 32px);padding:0;overflow:hidden;border:1px solid var(--line);border-radius:16px;background:var(--paper);color:var(--ink);box-shadow:0 24px 80px #0003}
#reader-settings::backdrop{background:#15203380}
#reader-settings form{display:flex;flex-direction:column;max-height:calc(100dvh - 34px)}
.reader-settings-heading{padding:24px 24px 16px;border-bottom:1px solid var(--line);flex:none}
#reader-settings h2{margin:0;font-size:22px}
#reader-settings p{font-size:14px;line-height:1.6;color:var(--muted);margin:8px 0}
.reader-settings-content{padding:8px 24px 16px;overflow:auto;overscroll-behavior:contain;min-height:0}
#reader-settings label{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-block:16px}
#reader-settings :is(input,select){font:inherit;min-height:40px;padding:8px;color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:8px}
#reader-settings input{width:4em}
#reader-settings :is(input,select):focus-visible{outline:2px solid var(--accent);outline-offset:2px}
#reader-settings fieldset{min-width:0;margin:20px 0 0;padding:8px 16px;border:1px solid var(--line);border-radius:10px}
#reader-settings legend{padding-inline:6px;font-weight:600}
#reader-settings summary{cursor:pointer;padding-block:16px 4px;font-weight:600}
#reader-settings input[type=checkbox]{width:20px;height:20px;min-height:0;accent-color:var(--accent);flex-shrink:0}
#reader-settings input[type=number]{width:5em}
.reader-settings-footer{flex:none;padding:12px 24px 20px;border-top:1px solid var(--line);background:var(--card)}
#reader-settings [role=status]:empty{display:none}
#reader-settings [role=status]{color:var(--ink);margin:0 0 12px}
.reader-settings-actions{display:flex;gap:8px;align-items:center}
.reader-settings-actions button{min-height:40px;padding:8px 14px}
.reader-settings-actions [data-reset]{margin-right:auto;background:transparent;border-color:transparent;color:var(--muted)}
.reader-settings-actions [type=submit]{background:var(--accent);border-color:var(--accent);color:var(--paper)}
@media(max-width:700px){body>header{flex-wrap:wrap}}
@media(max-width:400px){.reader-settings-heading,.reader-settings-content,.reader-settings-footer{padding-left:16px;padding-right:16px}.reader-settings-actions button{padding-inline:10px}}

/* 現場筆跡獨立於內容 DOM；工具列、索引與設定保持可操作。 */
#reader-ink{position:fixed;z-index:5;pointer-events:none;overflow:hidden}
#reader-ink.is-drawing{pointer-events:auto;touch-action:none;cursor:crosshair;user-select:none}
#reader-ink>*{pointer-events:none}
.reader-playback-tools{grid-column:3;grid-row:1;display:flex;align-items:center;gap:8px}
#reader-tools-menu>summary{display:grid;place-items:center;width:40px;height:40px;list-style:none;cursor:pointer;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink)}
#reader-tools-menu>summary::-webkit-details-marker{display:none}
#reader-tools-menu>summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
#reader-tools-menu[open]>summary,#reader-tools-menu:not([data-active-mode=normal])>summary{background:var(--accent);color:var(--paper)}
#reader-drawing{position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);display:flex;justify-content:center;width:max-content;max-width:calc(100vw - 24px);padding:0;cursor:default}
.reader-drawing-tools{display:flex;align-items:center;gap:3px;padding:4px;border:1px solid var(--line);border-radius:12px;background:var(--card);box-shadow:0 2px 8px #26282008}
#reader-drawing button,#reader-drawing summary{display:flex;align-items:center;justify-content:center;gap:6px;min-width:34px;height:32px;padding:0 9px;border:0;border-radius:7px;background:transparent;color:var(--muted);font:inherit;font-size:12px;cursor:pointer;white-space:nowrap}
#reader-drawing button:not(:disabled):hover,#reader-drawing summary:hover{background:var(--tint);color:var(--ink)}
#reader-drawing button[aria-pressed=true]{background:var(--ink);color:var(--paper)}
#reader-drawing button[data-mode=pen][aria-pressed=true]{background:var(--accent);color:var(--paper)}
#reader-drawing button[data-mode=laser][aria-pressed=true]{background:#fee2e2;color:#b91c1c}
.reader-tool-divider{width:1px;height:18px;background:var(--line);margin:0 3px}
#reader-drawing summary{list-style:none}
#reader-drawing summary::-webkit-details-marker{display:none}
#reader-drawing summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.reader-pen-panel{position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);width:240px;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--card);box-shadow:0 8px 30px #26282020;display:grid;gap:12px;color:var(--ink);font-size:13px}
.reader-pen-panel strong{font-size:13px}
.reader-pen-panel label{display:flex;justify-content:space-between;align-items:center;gap:16px}
.reader-pen-panel select{width:120px;padding:6px 8px;border:1px solid var(--line);border-radius:6px;background:var(--paper);color:var(--ink);font:inherit}
.reader-pen-panel small{font-size:11px;line-height:1.6;color:var(--muted)}
#reader-drawing [role=status]:not(:empty){position:absolute;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);width:max-content;max-width:calc(100vw - 32px);padding:10px 14px;border-radius:8px;background:var(--ink);color:var(--paper);font-size:12px;box-shadow:0 4px 16px #26282020;pointer-events:none}
@media(max-width:400px){#reader-drawing button,#reader-drawing summary{padding-inline:7px;gap:4px}.reader-drawing-tools{gap:1px}}
#reader-laser{position:fixed;inset:0;z-index:6;pointer-events:none}
#reader-laser b{position:absolute;width:12px;height:12px;border-radius:50%;background:#ff3232;box-shadow:0 0 4px 2px #fff,0 0 12px 5px #f339;transform:translate(-50%,-50%)}
@media print{#reader-ink,#reader-laser,#reader-drawing{display:none}}

/* 分享匯出：工具入口與隔離的靜態預覽，不改變目前頁面。 */
.reader-export-toggle{order:2;min-height:36px;padding:7px 12px;font-size:14px}
#reader-export{width:min(520px,calc(100vw - 32px));max-height:calc(100dvh - 32px);padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--ink)}
#reader-export::backdrop{background:#17243466}
#reader-export h2{font-size:22px;margin:0 0 12px}
#reader-export p{line-height:1.7;overflow-wrap:anywhere}
.reader-export-formats{display:flex;flex-wrap:wrap;gap:10px}
#reader-export [role=status]{min-height:1.7em;font-size:14px;color:var(--muted)}
.reader-export-host{position:fixed;left:-20000px;top:0;width:1200px;pointer-events:none}
.reader-export-host>.reader-export-page{position:relative;top:auto;left:auto;width:1200px;max-width:none;min-height:675px;margin:0;padding:40px;background:var(--paper);zoom:1;transform:none}
.reader-export-page *{animation:none!important;transition:none!important}
.reader-export-page [data-hidden],.reader-export-page>:has(>[data-field-hidden]){display:none!important}
.reader-export-page:has(>.stage>.deck-cover,>.stage>.deck-end){padding:0;min-height:0}
.reader-export-page>.stage:has(>.deck-cover,>.deck-end){margin:0;padding:0;border:0;min-height:0;width:100%}

/* 文字標示與畫筆共用位置、暫存及清除；輸入時使用原生對話框。 */
#reader-ink.is-text{cursor:text}
#reader-ink.is-text .reader-text-box,#reader-ink.is-text .reader-text-box *{pointer-events:auto}
#reader-ink:not(.is-drawing) .reader-text-box{pointer-events:auto}
.reader-text-box>div{overflow:auto;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:10px 12px;font:22px/1.5 system-ui,sans-serif;white-space:pre-wrap;overflow-wrap:anywhere;box-sizing:border-box}
#reader-text-dialog{width:min(400px,calc(100vw - 32px));max-height:calc(100dvh - 32px);overflow:auto;padding:22px;border:1px solid var(--line);border-radius:14px;background:var(--card);color:var(--ink);box-shadow:0 16px 60px #0003}
#reader-text-dialog::backdrop{background:#17243455}
#reader-text-dialog h2{font-size:18px;margin:0 0 14px}
#reader-text-dialog textarea{display:block;width:100%;resize:vertical;min-height:110px;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);font:18px/1.5 system-ui,sans-serif}
#reader-text-dialog p{font-size:12px;line-height:1.6;color:var(--muted)}
#reader-text-dialog form>div{display:flex;justify-content:flex-end;gap:8px}
#reader-text-dialog button{font-size:14px;padding:8px 16px}
#reader-text-dialog button[value=save]{background:var(--accent);color:var(--paper)}
@media(max-width:480px){#reader-drawing [data-mode] span{display:none}#reader-drawing button,#reader-drawing summary{min-width:36px}}

#reader-ink:not(.is-drawing) .reader-text-box,#reader-ink.is-text .reader-text-box{cursor:move;touch-action:none;user-select:none}
#reader-text-selection{position:fixed;z-index:7;border:2px solid var(--accent);border-radius:8px;pointer-events:none}
#reader-text-selection button{position:absolute;right:-8px;bottom:-8px;width:22px;height:22px;padding:0;border:2px solid var(--card);border-radius:6px;background:var(--accent);color:var(--paper);font-size:15px;line-height:1;pointer-events:auto;touch-action:none;cursor:ew-resize}
#reader-text-tools{position:fixed;z-index:11;display:flex;align-items:center;gap:5px;padding:6px;border:1px solid var(--line);border-radius:9px;background:var(--card);color:var(--ink);box-shadow:0 4px 18px #0002;font-size:12px;max-width:calc(100vw - 16px);flex-wrap:wrap}
#reader-text-selection[hidden],#reader-text-tools[hidden]{display:none}
#reader-text-tools label{display:flex;align-items:center;gap:4px}
#reader-text-tools input{width:50px}
#reader-text-tools input,#reader-text-tools select,#reader-text-tools button{font:inherit;padding:5px;border:1px solid var(--line);border-radius:5px;background:var(--card);color:var(--ink);height:30px}
#reader-text-tools button[aria-pressed=true]{background:var(--ink);color:var(--paper)}
@media print{#reader-text-selection,#reader-text-tools{display:none}}
/* 換頁轉場（docs/adr/0033）：只動內容區；頁首、翻頁列與索引各自成組疊在內容之上，長頁轉場時不被蓋住。
   效果由 reader.js 設在 <html data-transition>，方向設在 data-turn；--turn 為 1（下一頁）或 -1（上一頁）。 */
body>main{view-transition-name:story-page}
body>header{view-transition-name:story-header}
body>nav{view-transition-name:story-nav}
html[data-turn=prev]{--turn:-1}
::view-transition-old(story-page){animation:.22s ease-in both story-slide-out}
::view-transition-new(story-page){animation:.28s ease-out both story-slide-in}
html[data-transition=fade]::view-transition-old(story-page){animation:.25s ease both story-fade-out}
html[data-transition=fade]::view-transition-new(story-page){animation:.25s ease both story-fade-in}
html[data-transition=push]::view-transition-group(story-page),html[data-transition=cover]::view-transition-group(story-page){overflow:hidden}
html[data-transition=push]::view-transition-old(story-page){animation:.42s cubic-bezier(.4,0,.2,1) both story-push-out}
html[data-transition=push]::view-transition-new(story-page){animation:.42s cubic-bezier(.4,0,.2,1) both story-push-in}
html[data-transition=zoom]::view-transition-old(story-page){animation:.22s ease-in both story-zoom-out}
html[data-transition=zoom]::view-transition-new(story-page){animation:.3s ease-out .08s both story-zoom-in}
html[data-transition=flip]::view-transition-image-pair(story-page){perspective:1600px}
html[data-transition=flip]::view-transition-old(story-page){animation:.2s ease-in both story-flip-out;backface-visibility:hidden}
html[data-transition=flip]::view-transition-new(story-page){animation:.24s ease-out .2s both story-flip-in;backface-visibility:hidden}
html[data-transition=cover]::view-transition-old(story-page){animation:.45s ease both story-dim}
html[data-transition=cover]::view-transition-new(story-page){animation:.45s cubic-bezier(.2,.8,.2,1) both story-push-in;background:var(--paper);box-shadow:0 0 40px #0003}
html[data-transition=wipe]::view-transition-old(story-page){animation:.45s both story-hold}
html[data-transition=wipe]::view-transition-new(story-page){animation:.45s cubic-bezier(.4,0,.2,1) both story-wipe-next}
html[data-transition=wipe][data-turn=prev]::view-transition-new(story-page){animation-name:story-wipe-prev}
html[data-transition=rise]::view-transition-old(story-page){animation:.25s ease-in both story-rise-out}
html[data-transition=rise]::view-transition-new(story-page){animation:.3s ease-out both story-rise-in}
html[data-transition=blur]::view-transition-old(story-page){animation:.25s ease-in both story-blur-out}
html[data-transition=blur]::view-transition-new(story-page){animation:.3s ease-out both story-blur-in}
@keyframes story-slide-out{to{opacity:0;translate:calc(var(--turn,1) * -40px) 0}}
@keyframes story-slide-in{from{opacity:0;translate:calc(var(--turn,1) * 40px) 0}}
@keyframes story-fade-out{to{opacity:0}}
@keyframes story-fade-in{from{opacity:0}}
@keyframes story-push-out{to{translate:calc(var(--turn,1) * -100%) 0}}
@keyframes story-push-in{from{translate:calc(var(--turn,1) * 100%) 0}}
@keyframes story-zoom-out{to{opacity:0;scale:.92}}
@keyframes story-zoom-in{from{opacity:0;scale:1.06}}
@keyframes story-flip-out{to{rotate:y calc(var(--turn,1) * -90deg)}}
@keyframes story-flip-in{from{rotate:y calc(var(--turn,1) * 90deg)}}
@keyframes story-dim{to{opacity:.35;scale:.95}}
@keyframes story-hold{to{opacity:1}}
@keyframes story-wipe-next{from{clip-path:inset(0 100% 0 0)}to{clip-path:inset(0)}}
@keyframes story-wipe-prev{from{clip-path:inset(0 0 0 100%)}to{clip-path:inset(0)}}
@keyframes story-rise-out{to{opacity:0;translate:0 calc(var(--turn,1) * -32px)}}
@keyframes story-rise-in{from{opacity:0;translate:0 calc(var(--turn,1) * 32px)}}
@keyframes story-blur-out{to{opacity:0;filter:blur(10px)}}
@keyframes story-blur-in{from{opacity:0;filter:blur(10px)}}
/* 拖動軸（reader.js createScrubber）：每頁一格，章節間隔較寬；滑過放大並浮出該頁縮圖。 */
.scrub{position:relative;width:calc(100% - 64px);max-width:1096px;margin:0 auto;height:22px;cursor:pointer;touch-action:none;outline:none;--scrub-h:4px}
.scrub:hover,.scrub.is-dragging,.scrub:focus-visible{--scrub-h:8px}
.scrub:focus-visible .scrub-track{outline:3px solid var(--accent);outline-offset:4px;border-radius:3px}
.scrub-track{position:absolute;inset:0;display:flex;align-items:center;gap:3px}
.scrub-seg{flex:1;height:var(--scrub-h);background:var(--line);border-radius:2px}
.scrub-seg.scrub-chapter{margin-left:6px}
.scrub-seg.is-past{background:color-mix(in srgb,var(--accent) 55%,var(--line))}
.scrub-seg.is-current{background:var(--accent)}
.scrub-seg.is-hover{background:color-mix(in srgb,var(--ink) 40%,var(--line))}
.scrub-seg.is-hover.is-past{background:color-mix(in srgb,var(--accent) 80%,var(--line))}
.scrub-head{position:absolute;top:50%;width:14px;height:14px;margin:-7px 0 0 -7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 2px var(--card);transform:scale(0);pointer-events:none}
.scrub:hover .scrub-head,.scrub:focus-visible .scrub-head,.scrub.is-dragging .scrub-head{transform:scale(1)}
@media(prefers-reduced-motion:no-preference){
.scrub-seg{transition:height .12s,background .12s}
.scrub-head{transition:transform .12s,left .2s}
.scrub.is-dragging .scrub-head{transition:transform .12s}
}
.scrub-tip{position:absolute;bottom:calc(100% + 8px);left:0;width:256px;background:var(--card);border:1px solid var(--line);border-radius:8px;box-shadow:0 8px 24px #2628202e;overflow:hidden;pointer-events:none;z-index:2;cursor:default}
.scrub-tip[hidden]{display:none}
.scrub-thumb{position:relative;height:150px;overflow:hidden;background:var(--paper);border-bottom:1px solid var(--line)}
.scrub-thumb .mini-page{transform:scale(.256)}
.scrub-thumb .mini-placeholder{font-size:32px;color:var(--accent)}
.scrub-caption{padding:8px 10px}
.scrub-caption small{display:block;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.scrub-caption strong{display:block;font-size:14px;line-height:1.4;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media(max-width:700px){
.scrub{width:calc(100% - 24px);height:28px}
.scrub-tip{width:200px}
.scrub-thumb{height:118px}
.scrub-thumb .mini-page{transform:scale(.2)}
}
/* 附件（story.attachments）：頁首按鈕，展開為下拉清單。 */
.reader-attach{order:2;position:relative;align-self:center}
.reader-attach>summary{list-style:none;cursor:pointer;min-height:36px;display:flex;align-items:center;gap:6px;padding:7px 12px;font-size:14px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink)}
.reader-attach>summary::-webkit-details-marker{display:none}
.reader-attach>summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.reader-attach>summary b{font-size:12px;min-width:1.6em;padding:0 5px;border-radius:9px;background:var(--accent);color:var(--paper);text-align:center}
.reader-attach>ul{position:absolute;right:0;top:calc(100% + 6px);z-index:30;width:max-content;min-width:240px;max-width:min(380px,calc(100vw - 24px));max-height:60dvh;overflow:auto;margin:0;padding:6px;list-style:none;background:var(--card);border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 28px #26282030}
.reader-attach a{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding:9px 10px;border-radius:6px;color:var(--ink);text-decoration:none}
.reader-attach a:hover,.reader-attach a:focus-visible{background:var(--tint)}
.reader-attach a strong{font-weight:500;line-height:1.4}
.reader-attach a small{flex:none;font-size:11px;color:var(--muted);letter-spacing:.04em}
@media(max-width:700px){.reader-attach>ul{position:fixed;left:12px;right:12px;width:auto;max-width:none}}
@media print{.reader-attach{display:none}}
/* 頁首有自己的疊層（view-transition-name）；展開時整個頁首提到索引與講稿窗格之上，清單才點得到。 */
body>header:has(.reader-attach[open]){position:relative;z-index:25}
/* 縮圖總覽（reader.js createOverview）：翻頁列的總覽鈕與全畫面縮圖格。 */
.reader-overview-toggle{display:grid;place-items:center;width:40px;height:40px;padding:0;border-radius:8px;background:var(--card);color:var(--ink)}
#reader-overview{width:min(1180px,calc(100vw - 32px));height:calc(100dvh - 48px);max-width:none;max-height:none;padding:0;border:0;border-radius:14px;background:var(--paper);color:var(--ink);box-shadow:0 24px 60px #0005;flex-direction:column}
#reader-overview[open]{display:flex}
#reader-overview::backdrop{background:#121b26b3;backdrop-filter:blur(3px)}
#reader-overview>header{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:none;margin:0;padding:16px 24px;background:var(--deck-gradient,var(--ink));color:#fff}
#reader-overview h2{display:flex;align-items:baseline;gap:10px;margin:0;font-size:18px}
#reader-overview h2 small{font-size:13px;font-weight:400;opacity:.8}
#reader-overview [data-close]{width:36px;height:36px;padding:0;border-radius:8px;border-color:#ffffff60;background:#ffffff26;color:#fff;font-size:16px}
.reader-overview-body{flex:1;overflow:auto;overscroll-behavior:contain;padding:8px 24px 28px}
#reader-overview ol{display:grid;grid-template-columns:repeat(auto-fill,224px);gap:22px 18px;justify-content:center;margin:0;padding:16px 0 0;list-style:none}
.reader-overview-chapter{display:block;height:18px;margin-bottom:6px;overflow:hidden;font-size:12px;font-weight:650;letter-spacing:.06em;white-space:nowrap;text-overflow:ellipsis;color:var(--deck-primary,var(--accent))}
.reader-overview-item{display:block;width:224px;padding:0;border:0;border-radius:8px;background:none;text-align:left}
:where(.reader-overview-item):hover{background:none}
.reader-overview-thumb{position:relative;display:block;height:140px;overflow:hidden;border:1px solid var(--line);border-radius:6px;background:var(--card);box-shadow:0 1px 4px #26282014}
.reader-overview-thumb .mini-page{transform:scale(.224)}
.reader-overview-item:hover .reader-overview-thumb{border-color:var(--accent);box-shadow:0 6px 18px #26282024}
.reader-overview-item[aria-current] .reader-overview-thumb{outline:3px solid var(--accent);outline-offset:2px}
.reader-overview-meta{display:flex;gap:8px;margin-top:8px;font-size:13px;line-height:1.45;color:var(--muted)}
.reader-overview-meta b{flex:none;font-variant-numeric:tabular-nums;color:var(--ink)}
.reader-overview-item[aria-current] .reader-overview-meta{font-weight:600;color:var(--ink)}
@media(prefers-reduced-motion:no-preference){.reader-overview-thumb{transition:border-color .15s,box-shadow .15s}}
@media(max-width:700px){
#reader-overview{width:100vw;height:100dvh;border-radius:0}
#reader-overview>header{padding:12px 16px}
.reader-overview-body{padding:4px 12px 20px}
#reader-overview ol{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.reader-overview-item{width:100%}
.reader-overview-thumb{height:auto;aspect-ratio:16/10}
.reader-overview-thumb .mini-page{transform:scale(.168)}
}