/* Paper treatment is local to notes/cards and their landing-page illustrations.
 * No :root/body defaults, app layout, content, or learning-state changes.
 * Colors come from the shared tokens in kaopy.css (both themes); the note
 * paper is the one warm surface (--board-paper / --board-border).
 */
.board-doc,
.pair-sec {
  --study-book: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', SimSun, Georgia, serif;
}

/* Inside the paper, lines use the paper's own border. */
.board-doc {
  --border: var(--board-border);
  --border-strong: var(--board-border);
  /* 纸里的荧光标记、引用底色用加深一档的 --board-marker；全站的 --marker-soft 不动 */
  --marker-soft: var(--board-marker);
  color: var(--ink);
  background-color: var(--board-paper);
  font-family: var(--font-sans);
}
.board-doc .cornell-workspace,
.board-doc .cornell-advisor-footer {
  --cornell-paper: var(--board-paper);
  --cornell-ink: var(--ink);
  --cornell-muted: var(--muted);
  --cornell-border: var(--board-border);
  --cornell-focus: var(--accent-strong);
  --cornell-warm: var(--marker-soft);
  --note-blue: var(--accent-strong);
  --note-green: var(--success);
  --note-amber: var(--marker-ink);
  --note-red: var(--danger);
  color: var(--ink);
  background: var(--board-paper);
  font-family: var(--font-sans);
}
.board-doc .board-head strong,
.board-doc .board-sec h5,
.board-doc .flashcard__question h3 {
  font-family: var(--study-book);
  font-weight: 600;
}
.board-doc .cornell-workspace__nav-button:hover,
.board-doc .cornell-workspace__source:hover { background: var(--surface-subtle); }
.board-doc .cornell-workspace__nav-button[aria-current="page"] {
  color: var(--accent-strong); background: var(--accent-soft); border-color: var(--board-border);
}
.board-doc .cornell-workspace__review-action { background: var(--surface-subtle); }
.board-doc .note-card { background: var(--surface); }
.board-doc .board-view-switch { border-radius: var(--r-pill); }
.board-doc .board-view-switch button { border-radius: var(--r-pill); }
.board-doc .board-view-switch button[aria-selected="true"] { box-shadow: 0 0 0 1px var(--board-border); }
.board-doc .flashcard {
  background: var(--board-paper);
  border-color: var(--board-border);
}
.board-doc .flashcard-workspace__reveal { border-radius: var(--r-pill); }
.board-doc .flashcard-rating--again { color: var(--danger); background: var(--danger-soft); border-color: var(--board-border); }
.board-doc .flashcard-rating--hard { color: var(--marker-ink); background: var(--marker-soft); border-color: var(--board-border); }
.board-doc .flashcard-rating--good { color: var(--success); background: var(--success-soft); border-color: var(--board-border); }
.board-doc .flashcard-workspace__notice { color: var(--marker-ink); background: var(--marker-soft); border-color: var(--board-border); }
.board-doc :is(.board-view-switch button, .flashcard-rating, .flashcard-workspace__reveal):focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px;
}

/* t-20261002-ca3a 闪卡：评完一张，卡片收走（记得先描一圈绿边），下一张升入，进度条前进；
   一轮过完给出记得、模糊、不会各几张。基础样式即终态，减少动态时由全局规则关掉动画。 */
.ca-fc-bar { height: 3px; margin: 0 0 12px; overflow: hidden; border-radius: 3px; background: var(--surface-subtle); }
.ca-fc-bar i { --ca-from: 0%; display: block; height: 100%; border-radius: 3px; background: var(--accent); }
.ca-fc-bar.is-done i { background: var(--success); }
.ca-fc-bar.ca-live i { animation: ca-fc-grow 280ms cubic-bezier(.2, .8, .2, 1) both; }
.flashcard.ca-leaving.ca-good { border-color: var(--success); box-shadow: inset 0 0 0 1px var(--success); }
.flashcard.ca-leaving { animation: ca-fc-lift 160ms ease-in 140ms both; }
.flashcard.ca-entering { animation: ca-fc-rise 280ms cubic-bezier(.2, .8, .2, 1) both; }
.ca-fc-sum { display: grid; gap: 6px; margin: 0 0 12px; padding: 12px 14px; border: 1px solid var(--board-border); border-radius: var(--r-md); background: var(--surface); color: var(--ink); }
.ca-fc-sum.ca-live { animation: ca-fc-rise 280ms cubic-bezier(.2, .8, .2, 1) both; }
.ca-fc-sum strong { font-size: var(--fs-ui); }
.ca-fc-sum__row { display: flex; flex-wrap: wrap; gap: 12px; color: var(--muted); font-size: var(--fs-caption); }
.ca-fc-sum__row b { color: var(--ink); font-size: var(--fs-ui); font-variant-numeric: tabular-nums; }
.ca-fc-sum p { margin: 0; color: var(--muted); font-size: var(--fs-caption); }
/* t-20261007-brxy：一轮过完——进度条走满转绿后鼓一下，小结卡右上角弹纸片，标题和三个数字依次跳出来 */
.ca-fc-sum { position: relative; }
.ca-fc-sum > .ca-spark { left: auto; right: 28px; top: 18px; }
.ca-fc-bar.is-done.ca-live { transform-origin: left center; animation: ca-fc-swell 520ms ease-out 260ms both; }
.ca-fc-sum.ca-live strong { animation: ca-pop-in 360ms var(--ca-back, ease-out) 160ms both; transform-origin: left center; }
.ca-fc-sum.ca-live .ca-fc-sum__row b { display: inline-block; animation: ca-pop-in 360ms var(--ca-back, ease-out) 360ms both; }
.ca-fc-sum.ca-live .ca-fc-sum__row span:nth-child(2) b { animation-delay: 460ms; }
.ca-fc-sum.ca-live .ca-fc-sum__row span:nth-child(3) b { animation-delay: 560ms; }
.flashcard.ca-leaving.ca-good { animation: ca-fc-good 140ms ease-out both, ca-fc-lift 160ms ease-in 140ms both; }
@keyframes ca-fc-swell { 0% { transform: scaleY(1); } 40% { transform: scaleY(2.4); } 100% { transform: scaleY(1); } }
@keyframes ca-fc-good { from { box-shadow: inset 0 0 0 1px var(--success), 0 0 0 0 color-mix(in srgb, var(--success) 45%, transparent); } to { box-shadow: inset 0 0 0 1px var(--success), 0 0 0 6px color-mix(in srgb, var(--success) 0%, transparent); } }
@keyframes ca-fc-grow { from { width: var(--ca-from); } }
@keyframes ca-fc-lift { to { opacity: 0; transform: translateY(-10px); } }
@keyframes ca-fc-rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* The two existing teaching/note illustrations retain their original geometry. */
.pair-sec .pill { color: var(--ink); }
.pair-sec .pill p { color: var(--muted); }
.pair-sec .pill-card {
  border: 1px solid var(--board-border);
  border-radius: var(--r-md);
}
.pair-sec .p-1 { --p-bg: var(--success-soft); }
.pair-sec .p-2 { --p-bg: var(--marker-soft); }
.pair-sec .note { border-radius: var(--r-sm); color: var(--ink); background: var(--board-paper); border-color: var(--board-border); }
.pair-sec .note-h { font-family: var(--study-book); font-weight: 600; }
.pair-sec .flash .face { border-radius: var(--r-sm); color: var(--ink); background: var(--surface); border-color: var(--board-border); }
.pair-sec .flash .back { color: var(--accent-strong); background: var(--accent-soft); }
.pair-sec .flash-k { color: var(--faint); }
.pair-sec .flash .back .flash-k { color: var(--accent-strong); opacity: 1; }
.pair-sec .loop .node rect { fill: var(--surface); stroke: var(--board-border); stroke-width: 1; }
.pair-sec .loop .node text { fill: var(--ink); font-family: var(--study-book); font-weight: 600; }
.pair-sec .loop .node.is-test text,
.pair-sec .loop .edge-label { fill: var(--accent-strong); }
.pair-sec .loop .edge { stroke-width: 1.5; }
.pair-sec .loop .edge.back { stroke: var(--accent-strong); stroke-dasharray: 5 8; animation: study-flow 10s linear infinite; }

/* Decorative movement does not encode real course progress. */
.flowchart > svg > path { stroke-width: 1.5; stroke-dasharray: 5 8; animation: study-flow 14s linear infinite; }
.flowchart .fnode-icon { border: 1px solid var(--border); }
.flowchart:hover > svg > path,
.pair-sec .pill-card:hover .edge.back { animation-play-state: paused; }
@keyframes study-flow { to { stroke-dashoffset: -104; } }
@media (prefers-reduced-motion: reduce) {
  .flowchart > svg > path, .pair-sec .loop .edge.back { animation: none; stroke-dasharray: none; }
  .pair-sec .flash-inner { transition: none; }
}

/* The full blueprint and its editor belong to the conversation's scroll area,
   so they cannot push the fixed composer beyond the viewport. */
.paper-workflow {
  display: grid;
  gap: 12px;
  margin: 0 0 12px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--ink);
}
.paper-workflow[hidden] { display: none; }
.paper-workflow__head,
.paper-workflow__actions,
.paper-workflow__editor-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.paper-workflow__head { justify-content: space-between; gap: 12px; }
.paper-workflow__head h2,
.paper-workflow__heading,
.paper-workflow__summary,
.paper-workflow__status,
.paper-workflow__wait,
.paper-workflow__error,
.paper-workflow__empty,
.paper-workflow__hint { margin: 0; }
.paper-workflow__head h2 { font-size: 18px; line-height: 1.45; }
.paper-workflow__heading { font-size: var(--fs-body); }
.paper-workflow__hint,
.paper-workflow__wait,
.paper-workflow__busy { color: var(--muted); font-size: var(--fs-caption); }
.paper-workflow__summary { color: var(--muted); font-size: var(--fs-ui); font-variant-numeric: tabular-nums; }
.paper-workflow__status { margin-left: auto; color: var(--muted); font-size: var(--fs-caption); font-weight: 600; line-height: 1.45; }
.paper-workflow__status[data-status="cancelled"] { color: var(--danger); }
.paper-workflow__status[data-status="published"] { display: none; }
.paper-workflow__metrics {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 0;
}
.paper-workflow__metric {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  min-width: max-content;
}
.paper-workflow__metric dt { color: var(--muted); font-size: var(--fs-caption); }
.paper-workflow__metric dd { margin: 0; font-weight: 600; }
.paper-workflow__published { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px 20px; }
.paper-workflow__published .paper-workflow__actions { margin-left: auto; }
/* 分区清单：一行一区，左边分区名，右边题数与分值 */
.paper-workflow__sections { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none; }
.paper-workflow__section { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; min-width: 0; font-size: var(--fs-ui); line-height: 1.5; }
.paper-workflow__section-title { min-width: 0; }
.paper-workflow__section-meta { color: var(--muted); font-size: var(--fs-caption); font-variant-numeric: tabular-nums; white-space: nowrap; }
.paper-workflow__edit-section-summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) max-content;
  align-items: center;
  column-gap: 8px;
  cursor: pointer;
  list-style: none;
}
.paper-workflow__edit-section-summary::-webkit-details-marker { display: none; }
.paper-workflow__edit-section-summary::before {
  content: '›';
  grid-column: 1;
  grid-row: 1;
  width: 14px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1;
  transition: transform 160ms ease;
}
.paper-workflow__edit-section[open] > .paper-workflow__edit-section-summary::before { transform: rotate(90deg); }
.paper-workflow__edit-section-summary:focus-visible { border-radius: var(--r-xs); outline: 2px solid var(--accent); outline-offset: 3px; }
.paper-workflow__edit-section::details-content {
  block-size: 0;
  overflow-y: clip;
  opacity: 0;
  transition: block-size 180ms ease, opacity 140ms ease;
}
.paper-workflow__edit-section[open]::details-content { block-size: auto; opacity: 1; }
.paper-workflow__gaps { display: grid; gap: 6px; }
.paper-workflow__gap-list { margin: 0; padding-left: 22px; color: var(--danger); }
.paper-workflow__editor {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 4px 0 0;
}
.paper-workflow__edit-overview { display: grid; grid-template-columns: minmax(0, 2fr) minmax(110px, 1fr); gap: 10px 12px; }
.paper-workflow__edit-field { display: grid; gap: 5px; min-width: 0; margin: 0; color: var(--muted); font-size: var(--fs-caption); }
.paper-workflow__edit-field.is-wide { grid-column: 1 / -1; }
.paper-workflow__edit-field textarea { min-height: 84px; resize: vertical; }
.paper-workflow__edit-sections { display: grid; gap: 12px; }
.paper-workflow__edit-section { interpolate-size: allow-keywords; }
.paper-workflow__edit-section-summary strong { grid-column: 2; grid-row: 1; min-width: 0; font-size: var(--fs-ui); }
.paper-workflow__edit-section-summary span { grid-column: 3; grid-row: 1; color: var(--muted); font-size: var(--fs-caption); white-space: nowrap; }
.paper-workflow__edit-section-body { display: grid; gap: 12px; padding: 10px 0 2px 18px; }
.paper-workflow__edit-slot { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)) auto; align-items: end; gap: 8px; min-width: 0; margin: 0; padding: 4px 0 8px; }
.paper-workflow__edit-slot + .paper-workflow__edit-slot { margin-top: 4px; }
.paper-workflow__edit-slot-title { grid-column: 1 / -1; margin: 0; font-size: var(--fs-ui); font-weight: var(--fw-strong); }
.paper-workflow__edit-slot .btn { align-self: end; }
.paper-workflow__editor-actions { justify-content: flex-start; }
.paper-workflow__error { color: var(--danger); }
.quiz-paper-window-report {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: var(--fs-caption);
}
.quiz-paper-window-report strong { color: var(--ink); }
.quiz-paper-window-report__section { display: grid; gap: 6px; min-width: 0; }
.quiz-paper-window-report__heading { margin: 0; color: var(--ink); font-size: var(--fs-ui); }
.quiz-paper-window-report__sources,
.quiz-paper-window-report__checks,
.quiz-paper-window-report__gaps { display: grid; gap: 6px; margin: 0; padding-left: 20px; }
.quiz-paper-window-report__source { display: grid; gap: 2px; min-width: 0; }
.quiz-paper-window-report__source-name,
.quiz-paper-window-report__reason { min-width: 0; overflow-wrap: anywhere; }
.quiz-paper-window-report__source-link { color: var(--accent-strong); }
.quiz-paper-window-report__locator,
.quiz-paper-window-report__empty { color: var(--muted); }
.quiz-paper-window-report__check { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 8px; min-width: 0; }
.quiz-paper-window-report__status { color: var(--ink); font-weight: 600; }
.quiz-paper-window-report__status[data-status="explicit_error"] { color: var(--danger); }
.quiz-paper-window-report__status[data-status="uncertain"],
.quiz-paper-window-report__status[data-status="unknown"],
.quiz-paper-window-report__status[data-status="other"] { color: var(--muted); }
@media (max-width: 700px) {
  .paper-workflow__status { margin-left: 0; }
  .paper-workflow__published { align-items: flex-start; }
  .paper-workflow__published .paper-workflow__actions { margin-left: 0; }
  .paper-workflow__actions .btn,
  .paper-workflow__editor-actions .btn { flex: 1 1 auto; }
  .paper-workflow__edit-overview { grid-template-columns: 1fr; }
  .paper-workflow__edit-field.is-wide { grid-column: auto; }
  .paper-workflow__edit-slot { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .paper-workflow__edit-slot .btn { justify-self: start; }
}
@media (prefers-reduced-motion: reduce) {
  .paper-workflow__edit-section-summary::before,
  .paper-workflow__edit-section::details-content { transition: none; }
}

/* t-20261007-q6sl 出卷进度：一条细进度条（已定稿 / 题位总数），下面一行计数和一句去向说明 */
.paper-workflow__progress { display: grid; gap: 6px; }
.paper-workflow__bar {
  display: block;
  width: 100%;
  height: 4px;
  overflow: hidden;
  border: 0;
  border-radius: var(--r-xs);
  background: var(--border);
  color: var(--accent);
  -webkit-appearance: none;
  appearance: none;
}
.paper-workflow__bar::-webkit-progress-bar { border-radius: var(--r-xs); background: var(--border); }
.paper-workflow__bar::-webkit-progress-value { border-radius: var(--r-xs); background: var(--accent); transition: width 400ms ease; }
.paper-workflow__bar::-moz-progress-bar { border-radius: var(--r-xs); background: var(--accent); }
.paper-workflow__counts { margin: 0; color: var(--ink); font-size: var(--fs-ui); font-variant-numeric: tabular-nums; }
.paper-workflow__aside { margin: 0; color: var(--muted); font-size: var(--fs-caption); }
@media (prefers-reduced-motion: reduce) { .paper-workflow__bar::-webkit-progress-value { transition: none; } }

/* ---------- 答题纸：一张 A4 卷子（t-20261009-htuw） ----------
   版式同导出 PDF（paper-print.js，照经济学原理期末样题）：A4 794×1123px（96dpi），左右 22mm，衬线字；
   居中两行标题、卷首说明、罗马数字分区、分区内题号、题干末尾分值、选项 a. b. 分行缩进、页脚页码。
   每题下面是横线答题区：行数 = 小问数（至少 1 行），写满一行就多出一行；附的图贴在答题区里。
   学生写的字是唯一的蓝笔（--accent、楷体），批改是绿 / 红笔。深色把纸换成 --surface，同笔记纸；导出 PDF 仍是白纸。
   页高与页边只定义在这里，workspace-quiz-paper.js 的分页读它们；窄屏把页高设成 0：一张连续的纸，不分页。 */
.quiz-paper-sheet {
  --quiz-paper-page-h: 1123px;
  --quiz-paper-page-top: 83px;
  --quiz-paper-page-bottom: 76px;
  --quiz-paper-page-gap: 28px;
  --quiz-paper-page-x: 83px;
  --quiz-paper-pen: var(--accent);
  --quiz-paper-pen-font: 'Kaopy Reading Latin', 'Kaiti SC', 'STKaiti', 'KaiTi', '楷体', serif;
  --quiz-paper-rule: color-mix(in srgb, var(--border-strong) 78%, var(--surface));
  --quiz-paper-line: 34px;
  --quiz-paper-ring-draw: url('../brand/kaopy-ring-mark-once.svg');
  position: relative;
  width: 794px;
  margin: 0 auto;
  padding: var(--quiz-paper-page-top) var(--quiz-paper-page-x) 0;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--ink);
  font: 15px/1.8 var(--reading-book);
}
.quiz-paper-sheet .is-page-first { margin-top: 0; }

/* 卷头：同导出 PDF 的 .pp-head / .pp-intro */
.quiz-paper-sheet-head { margin: 0 0 16px; text-align: center; }
.quiz-paper-sheet-title { font-size: 17px; font-weight: 700; line-height: 1.55; }
.quiz-paper-sheet-subtitle { font-weight: 700; }
.quiz-paper-sheet-intro { margin: 0 0 6px; }
.quiz-paper-window-section { display: flex; align-items: center; gap: 12px; margin: 20px 0 4px; font: inherit; font-weight: 700; }
.quiz-paper-section-name { flex: 1; min-width: 0; }

/* 一道题：图在题干上方，题号在首段前，分值接在末段后 */
.quiz-paper-window-question { position: relative; margin: 0 0 18px; }
.quiz-paper-window-prompt { position: relative; margin: 0; font: inherit; overflow-wrap: anywhere; }
.quiz-paper-window-prompt > .api-question-stem { margin-bottom: 0; font: inherit; }
.quiz-paper-prompt-para { white-space: pre-line; }
.quiz-paper-prompt-para + .quiz-paper-prompt-para { margin-top: 3px; }
.quiz-paper-prompt-prefix { margin-bottom: 2px; }
.quiz-paper-prompt-suffix { margin-top: 2px; }
.quiz-paper-prompt-points { font-size: inherit; white-space: nowrap; }
/* 生成失败的题位：题号与分值照常，题干位置一句说明和「补出」 */
.quiz-paper-window-failed { color: var(--muted); }
.quiz-paper-window-regenerate { display: flex; align-items: center; gap: 8px; margin: 6px 0 0 2em; }
/* 试卷图居中，图注同导出 PDF：图下居中的一行「图 N 标题」；一题几张图的并排行在 workspace.css 的 .quiz-figure 旁 */
.quiz-paper-sheet .quiz-paper-figure { margin: 6px 0 8px; }
.quiz-paper-sheet .quiz-paper-figure :is(.html-visual-card, .canvas-visual-card, .material-page-card) { margin: 0 auto; }
.quiz-paper-sheet .quiz-paper-figure .material-page-image { max-height: 320px; }
.quiz-paper-sheet .quiz-paper-figure figcaption { justify-content: center; color: var(--ink); font: 13px/1.5 var(--reading-book); }
.quiz-paper-sheet .quiz-paper-figure figcaption :is(strong, .quiz-figure-label) { font-weight: 400; }
.quiz-paper-sheet .quiz-paper-figure :is(.visual-zoom-link, .material-page-open) { margin-left: 10px; font-family: var(--font-sans); font-size: 12px; opacity: 0; transition: opacity 140ms ease; }
.quiz-paper-sheet .quiz-paper-figure:is(:hover, :focus-within) :is(.visual-zoom-link, .material-page-open) { opacity: 1; }
@media (hover: none) { .quiz-paper-sheet .quiz-paper-figure :is(.visual-zoom-link, .material-page-open) { opacity: 1; } }

/* 括号回填：选了哪项，题干的（　　）里就写上字母 */
.quiz-paper-bracket { white-space: nowrap; }
.quiz-paper-bracket-fill { display: inline-block; min-width: 2.2em; color: var(--quiz-paper-pen); font-family: var(--quiz-paper-pen-font); font-size: 1.12em; line-height: 1; text-align: center; }

/* 选项：一行一个、缩进两字，整行可点；选中 = 细笔手作圈圈住字母（brand-spec.md「手作圈」第 4 条：人类 10/10 特批的例外）。
   已选的直接显示静止形；新选中的换成画一次（0.6 秒）的素材，地址由脚本每次换新，让动画重新开始 */
.quiz-paper-window-options { margin: 2px 0 0; }
.quiz-paper-option {
  position: relative;
  display: grid;
  grid-template-columns: 1.7em minmax(0, 1fr) auto;
  align-items: baseline;
  margin: 0 -8px 0 calc(2em - 8px);
  padding: 1px 8px;
  border-radius: var(--r-xs);
  cursor: pointer;
  transition: background-color 120ms ease;
  -webkit-tap-highlight-color: transparent;
}
.quiz-paper-option:hover { background: color-mix(in srgb, var(--accent-soft) 55%, transparent); }
.quiz-paper-option:active { background: color-mix(in srgb, var(--accent-soft) 85%, transparent); }
.quiz-paper-option input { position: absolute; top: 50%; left: 8px; width: 1px; height: 1px; margin: 0; opacity: 0; pointer-events: none; }
.quiz-paper-option:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 0; }
.quiz-paper-option-key { position: relative; font-variant-numeric: tabular-nums; }
.quiz-paper-option-text { overflow-wrap: anywhere; }
.quiz-paper-option-key::before {
  content: '';
  position: absolute;
  top: 52%;
  left: 0.45em;
  width: 44px;
  height: 44px;
  background: var(--quiz-paper-pen);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) rotate(-12deg);
  -webkit-mask: url('../brand/kaopy-ring-mark-still.svg') center / contain no-repeat;
  mask: url('../brand/kaopy-ring-mark-still.svg') center / contain no-repeat;
}
.quiz-paper-option.is-checked .quiz-paper-option-key { color: var(--quiz-paper-pen); }
.quiz-paper-option.is-checked .quiz-paper-option-key::before { opacity: 1; }
.quiz-paper-option.is-drawing .quiz-paper-option-key::before { -webkit-mask-image: var(--quiz-paper-ring-draw); mask-image: var(--quiz-paper-ring-draw); }
/* 交卷后：选错时正确项用同一个圈着绿，并标「正确答案」；学生选的标「你的选择」 */
.quiz-paper-window-options.is-review .quiz-paper-option { cursor: default; }
.quiz-paper-window-options.is-review .quiz-paper-option:is(:hover, :active) { background: transparent; }
.quiz-paper-option.is-correct-answer .quiz-paper-option-key { color: var(--success); }
.quiz-paper-option.is-correct-answer .quiz-paper-option-key::before { opacity: 1; background: var(--success); }
.quiz-paper-option-tags { align-self: center; margin-left: 10px; color: var(--faint); font: 600 11px/1 var(--font-sans); white-space: nowrap; }
.quiz-paper-option-tag + .quiz-paper-option-tag { margin-left: 6px; }
.quiz-paper-option-tag.is-correct-tag { color: var(--success); }

/* 横线答题区：不是输入框，是卷子上的横线，每条线一行字高；脚本按写下的内容把框加高到整行数 */
.quiz-paper-answer { margin: 4px 0 0 2em; }
/* 小问标签写在横线前，像卷子上的「(1) ________」；长标签放不下时横线换到下一行 */
.quiz-paper-window-blank { position: relative; display: flex; flex-wrap: wrap; align-items: flex-start; column-gap: 8px; }
.quiz-paper-window-blank > span {
  flex: none;
  min-width: 2.2em;
  max-width: 100%;
  padding-top: calc((var(--quiz-paper-line) - 1.8em) / 2 + 2px);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
  font-variant-numeric: tabular-nums;
  transition: color 120ms ease;
}
.quiz-paper-window-blank .quiz-paper-window-text { flex: 1 1 15em; min-width: 12em; }
.quiz-paper-window-text {
  display: block;
  width: 100%;
  height: var(--quiz-paper-line);
  min-height: var(--quiz-paper-line);
  margin: 0;
  padding: 0 2px;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  outline: none;
  resize: none;
  background: transparent linear-gradient(to bottom, transparent calc(var(--quiz-paper-line) - 1px), var(--quiz-paper-rule) calc(var(--quiz-paper-line) - 1px)) 0 0 / 100% var(--quiz-paper-line) local;
  box-shadow: none;
  color: var(--quiz-paper-pen);
  caret-color: var(--quiz-paper-pen);
  font: 17px/var(--quiz-paper-line) var(--quiz-paper-pen-font);
}
.quiz-paper-window-text::placeholder { color: transparent; -webkit-text-fill-color: transparent; }
.quiz-paper-window-text:focus-visible { outline: none; }
/* 正在写的那条线变蓝；写好了标签变黑 */
.quiz-paper-window-text:focus { --quiz-paper-rule: color-mix(in srgb, var(--quiz-paper-pen) 75%, var(--surface)); }
.quiz-paper-window-blank:focus-within > span { color: var(--quiz-paper-pen); }
.quiz-paper-window-blank:has(.quiz-paper-window-text:not(:placeholder-shown)) > span { color: var(--ink); }
.quiz-paper-window-text:disabled { opacity: 1; -webkit-text-fill-color: var(--quiz-paper-pen); }

/* 附图片：答题区末尾一行小字按钮，到两张就不再显示；图贴在横线下面。
   同一行的语音与用手机拍（.quiz-paper-tool，t-20261027-x17u / 2fqo）同一种小字按钮，不带「+」 */
.quiz-paper-window-photo-actions { display: flex; justify-content: flex-end; gap: 2px; margin-top: 2px; }
.quiz-paper-attach,
.quiz-paper-tool {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 26px;
  padding: 0 8px;
  border: 0;
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--faint);
  font: 600 12px/1 var(--font-sans);
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease;
}
.quiz-paper-attach::before { content: '+'; font-size: 14px; font-weight: 400; }
.quiz-paper-attach:hover:not(:disabled),
.quiz-paper-tool:hover:not(:disabled),
.quiz-paper-answer:focus-within .quiz-paper-attach,
.quiz-paper-answer:focus-within .quiz-paper-tool { background: color-mix(in srgb, var(--ink) 6%, transparent); color: var(--muted); }
.quiz-paper-attach:disabled { display: none; }
.quiz-paper-answer .attachment-list { gap: 12px; margin: 10px 0 2px; }
.quiz-paper-answer .attachment-chip:has(.attachment-chip__thumb) { position: relative; display: block; width: min(300px, 100%); padding: 0; border-radius: 0; background: transparent; box-shadow: none; }
.quiz-paper-answer .attachment-chip__thumb { display: block; width: 100%; height: auto; max-height: 260px; object-fit: contain; border: 1px solid var(--border); border-radius: 2px; background: var(--surface); }
.quiz-paper-answer .attachment-chip:has(.attachment-chip__thumb) .attachment-chip__name { display: block; margin-top: 3px; color: var(--faint); font: 11px/1.5 var(--font-sans); }
.quiz-paper-answer .attachment-chip:has(.attachment-chip__thumb) .attachment-chip__remove {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--ink) 62%, transparent);
  color: var(--surface);
  font: 15px/24px var(--font-sans);
  opacity: 0;
  transition: opacity 120ms ease;
}
.quiz-paper-answer .attachment-chip:hover .attachment-chip__remove,
.quiz-paper-answer .attachment-chip__remove:focus-visible { opacity: 1; }
@media (hover: none) { .quiz-paper-answer .attachment-chip .attachment-chip__remove { opacity: 1; } }

/* 交卷后：左页边批改记号（✓ 全对、半勾部分得分、✗ 不得分）与这题得分，分区标题旁得分格，卷首得分表；
   分区得分是脚本按题把判分结果加总，总分是交卷记录里的全卷得分 */
.quiz-paper-timer.is-score { font-family: var(--font-sans); }
.quiz-paper-mark {
  --quiz-paper-mark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 30'%3E%3Cpath d='M4 16 L12 25 L31 3' fill='none' stroke='%23000' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  position: absolute;
  top: -2px;
  left: -58px;
  width: 34px;
  height: 30px;
  background: var(--success);
  -webkit-mask: var(--quiz-paper-mark) center / contain no-repeat;
  mask: var(--quiz-paper-mark) center / contain no-repeat;
}
.quiz-paper-mark.is-partial {
  --quiz-paper-mark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 30'%3E%3Cpath d='M4 16 L12 25 L31 3 M14 9 L24 19' fill='none' stroke='%23000' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background: var(--danger);
}
.quiz-paper-mark.is-wrong {
  --quiz-paper-mark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 34 30'%3E%3Cpath d='M6 5 L28 26 M28 5 L6 26' fill='none' stroke='%23000' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background: var(--danger);
}
.quiz-paper-question-score { position: absolute; top: 30px; left: -62px; width: 44px; color: var(--danger); font: 15px/1.2 var(--quiz-paper-pen-font); text-align: center; white-space: nowrap; }
.quiz-paper-question-score.is-right { color: var(--success); }
.quiz-paper-question-score small { font-size: 11px; opacity: .8; }
.quiz-paper-section-score { display: inline-grid; flex: none; grid-template-columns: auto 52px; border: 1px solid var(--ink); font: 400 12px/1 var(--reading-book); }
.quiz-paper-section-score > span { display: grid; place-items: center; height: 30px; padding: 0 8px; }
.quiz-paper-section-score > span + span { border-left: 1px solid var(--ink); color: var(--danger); font: 20px/1 var(--quiz-paper-pen-font); }
.quiz-paper-section-score.is-full > span + span { color: var(--success); }
.quiz-paper-section-score small { margin-left: 1px; color: var(--muted); font: 10px/1 var(--reading-book); }
.quiz-paper-scores { width: 100%; margin: 4px 0 18px; border-collapse: collapse; font: 13px/1.4 var(--reading-book); text-align: center; table-layout: fixed; }
.quiz-paper-scores :is(th, td) { height: 30px; padding: 2px 4px; border: 1px solid var(--ink); font-weight: 400; }
.quiz-paper-scores tr > :first-child { width: 4.2em; }
.quiz-paper-scores .is-total { width: 8.5em; }
.quiz-paper-scores tr.is-score td { height: 46px; color: var(--danger); font: 22px/1 var(--quiz-paper-pen-font); }
.quiz-paper-scores tr.is-score td.is-full { color: var(--success); }
.quiz-paper-scores tr.is-score td.is-total { position: relative; font-size: 34px; }
.quiz-paper-scores td.is-total small { color: var(--muted); font: 13px/1 var(--reading-book); }
.quiz-paper-scores tr.is-score td.is-total::after { content: ''; position: absolute; right: 22%; bottom: 6px; left: 22%; height: 2px; border-radius: 2px; background: currentColor; opacity: .8; transform: rotate(-2deg); }
.quiz-paper-scores-pending { display: block; margin-top: 3px; color: var(--muted); font: 11px/1.2 var(--font-sans); }
/* 判分行（批改笔）、参考答案、解析写在答题区下面 */
.quiz-paper-result { margin: 6px 0 0 2em; }
.quiz-paper-window-feedback { font-family: var(--quiz-paper-pen-font); font-size: 16px; line-height: 1.7; }
.quiz-paper-window-feedback.is-correct { color: var(--success); }
.quiz-paper-window-feedback.is-wrong { color: var(--danger); }
.quiz-paper-window-feedback.is-pending { color: var(--muted); }
.quiz-paper-window-feedback .api-quiz-feedback { display: inline; margin: 0 0 0 1em; color: inherit; font: inherit; }
.quiz-paper-window-answer-key,
.quiz-paper-window-explanation { margin-top: 2px; font-size: 14px; line-height: 1.75; white-space: pre-line; overflow-wrap: anywhere; }
.quiz-paper-window-answer-key strong { font-weight: 400; }
.quiz-paper-window-explanation { color: var(--muted); }
.quiz-paper-window-explanation-label { color: var(--ink); }

/* 分页：每页 A4 高，页与页之间露出画布、页脚居中页码；题不跨页（一题比一页还高时那页加长） */
.quiz-paper-page-break { display: flex; flex-direction: column; }
.quiz-paper-page-fill { flex: 1 1 auto; }
.quiz-paper-page-number { display: grid; flex: none; height: var(--quiz-paper-page-bottom); place-items: start center; padding-top: 28px; color: var(--muted); font: 12px/1 var(--reading-book); font-variant-numeric: tabular-nums; }
.quiz-paper-page-gap { flex: none; height: var(--quiz-paper-page-gap); margin: 0 calc(-1 * var(--quiz-paper-page-x) - 1px); border-block: 1px solid var(--border); background: var(--canvas); }
.quiz-paper-page-top { flex: none; height: var(--quiz-paper-page-top); }
.quiz-paper-page-break.is-last :is(.quiz-paper-page-gap, .quiz-paper-page-top) { display: none; }

/* 窄屏：一张连续的纸，不分页，页边收成 20px；批改记号与这题得分移到题号前，同一行 */
@media (max-width: 860px) {
  .quiz-paper-window-body { padding: 0 0 48px; }
  .quiz-paper-sheet { --quiz-paper-page-h: 0px; width: 100%; padding: 28px 20px 24px; border-width: 0 0 1px; font-size: 16px; }
  .quiz-paper-option { margin-left: calc(1em - 8px); }
  .quiz-paper-answer,
  .quiz-paper-result,
  .quiz-paper-window-regenerate { margin-left: 1em; }
  .quiz-paper-mark { position: relative; top: auto; left: auto; display: inline-block; width: 26px; height: 22px; margin: 0 4px -4px 0; vertical-align: baseline; }
  .quiz-paper-question-score { position: static; display: inline-block; width: auto; margin-right: 6px; }
  .quiz-paper-attach,
  .quiz-paper-tool { height: 36px; }
  .quiz-paper-scores { font-size: 12px; }
  .quiz-paper-scores tr > :first-child { width: 3em; }
  .quiz-paper-scores .is-total { width: 5.5em; }
  .quiz-paper-scores tr.is-score td.is-total { font-size: 26px; }
  .quiz-paper-section-score { grid-template-columns: auto 44px; }
}
@media (prefers-reduced-motion: reduce) {
  .quiz-paper-option.is-drawing .quiz-paper-option-key::before { -webkit-mask-image: url('../brand/kaopy-ring-mark-still.svg'); mask-image: url('../brand/kaopy-ring-mark-still.svg'); }
}

/* 交卷后的核对：结论、核对答案、理由、依据各一行 */
.quiz-paper-window-report__detail { display: grid; gap: 3px; min-width: 0; }
.quiz-paper-window-report__line { min-width: 0; overflow-wrap: anywhere; }
.quiz-paper-window-report__line strong { margin-right: 2px; color: var(--ink); font-weight: 600; }
.quiz-paper-window-report__status[data-status="pass"] { color: var(--success); }
.quiz-paper-window-report__status[data-status="severe"] { color: var(--danger); }