/* 资料：我的资料、课本速览、章节速览（速览 / 知识图 / 背诵）、资料原页（手写、框题问老师）。和试卷、档案同一张白纸。 */

/* ---------- 我的资料 ---------- */
.lib-bar { display: flex; align-items: center; gap: 10px; margin: 4px 0 12px; }
.lib-search { flex: 1; min-width: 0; min-height: 46px; font: var(--t-body); }
.lib-upload { position: relative; display: inline-flex; align-items: center; gap: 6px; min-height: 46px; padding: 0 20px; border-radius: var(--r-control); font: 600 15px/1 var(--font); cursor: pointer; }
.lib-upload input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.lib-upload:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.lib-uploads:not(:empty) { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.lib-up { display: grid; grid-template-columns: minmax(0, 1fr) 160px 120px; align-items: center; gap: 12px; font: var(--t-control); }
.lib-up-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lib-up-bar { height: 4px; border-radius: 2px; background: var(--line); overflow: hidden; }
.lib-up-bar i { display: block; height: 100%; background: var(--accent); border-radius: 2px; transition: width var(--d-state) var(--ease-out); }
.lib-up-state { font: var(--t-caption); color: var(--muted); text-align: right; }
.lib-up[data-state="failed"] .lib-up-state { color: var(--danger); }
.lib-files { list-style: none; margin: 0; padding: 0; }
.lib-file { display: flex; flex-wrap: wrap; align-items: center; gap: 0 8px; border-bottom: 1px solid var(--line); }
.lib-file-main { flex: 1; min-width: 0; display: flex; align-items: center; gap: 14px; min-height: 64px; padding: 8px 6px; color: var(--ink); text-decoration: none; border-radius: 12px; }
a.lib-file-main:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (hover: hover) and (pointer: fine) { a.lib-file-main:hover { background: var(--control); } }
a.lib-file-main:active { transform: scale(.99); }
.lib-kind { flex: none; width: 46px; height: 40px; display: grid; place-items: center; border-radius: 10px; background: var(--control); font: 600 12px/1 var(--font); color: var(--ink-2); }
.lib-file-text { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.lib-file-text b { font: 600 15px/1.45 var(--font); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lib-file-text small { font: var(--t-caption); color: var(--muted); }
.lib-state { flex: none; display: inline-flex; align-items: center; gap: 6px; font: var(--t-caption); color: var(--ink-2); }
.lib-file[data-status="failed"] .lib-state, .lib-file[data-status="uploading"] .lib-state { color: var(--danger); }
.lib-file-actions { flex: none; display: flex; align-items: center; gap: 4px; }
.lib-pack { flex-basis: 100%; display: flex; flex-wrap: wrap; align-items: center; gap: 2px 10px; padding: 0 6px 10px 66px; font: var(--t-caption); color: var(--muted); }
.lib-pack-section { display: inline-flex; align-items: center; min-height: 32px; padding: 0 10px; border-radius: 10px; color: var(--ink-2); text-decoration: none; box-shadow: inset 0 0 0 1px var(--line); font-variant-numeric: tabular-nums; }
.lib-pack-section:active { transform: scale(.975); }
.lib-pack-section:focus-visible, .lib-pack-link:focus-visible, .pack-source:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (hover: hover) and (pointer: fine) { .lib-pack-section:hover { background: var(--control); } }
.lib-pack-link { display: inline-flex; align-items: center; min-height: 40px; padding: 0 12px; border-radius: var(--r-control); font: var(--t-control); color: var(--ink-2); text-decoration: none; }
.lib-resume { position: relative; display: inline-flex; align-items: center; min-height: 40px; padding: 0 12px; border-radius: var(--r-control); font: var(--t-control); color: var(--ink-2); cursor: pointer; }
.lib-resume input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; }
.lib-hit { display: flex; flex-direction: column; gap: 2px; padding: 12px 6px; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; border-radius: 10px; }
.lib-hit b { font: 600 15px/1.45 var(--font); }
.lib-hit span { font: var(--t-control); color: var(--ink-2); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; white-space: pre-line; }
@media (hover: hover) and (pointer: fine) { .lib-hit:hover { background: var(--control); } }
.lib-foot { margin: 24px 0 0; font: var(--t-caption); color: var(--muted); }

/* ---------- 课本速览目录 ---------- */
.lib-books { margin-top: 12px; }
.lib-book { min-width: 280px; max-width: 100%; font: var(--t-control); }
.lib-book-one { font: var(--t-caption); color: var(--muted); margin: 0; }
.lib-chapter { margin-top: 22px; }
.lib-sections { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 8px; }
.lib-section { display: flex; flex-direction: column; justify-content: center; min-height: 56px; padding: 10px 14px; border-radius: 14px; box-shadow: inset 0 0 0 1px var(--line); color: var(--ink); text-decoration: none; }
.lib-section b { font: 600 15px/1.45 var(--font); }
.lib-section small { font: var(--t-caption); color: var(--muted); }
span.lib-section { color: var(--muted); box-shadow: inset 0 0 0 1px var(--line); background: var(--control); }
span.lib-section b { color: var(--ink-2); font-weight: 400; }
a.lib-section:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
a.lib-section:active { transform: scale(.975); }
@media (hover: hover) and (pointer: fine) { a.lib-section:hover { box-shadow: inset 0 0 0 1px var(--line-strong), var(--sh-touch); } }

/* ---------- 小节资料 ---------- */
.pack-read { max-width: 760px; }
.pack-item { padding: 12px 0; border-bottom: 1px solid var(--line); }
.pack-title { margin: 0; font: var(--t-reading); font-size: 17px; }
.pack-title p, .lec-part p { margin: 0; }
.pack-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 12px; margin: 2px 0 0; font: var(--t-caption); color: var(--muted); }
.pack-source { display: inline-flex; align-items: center; min-height: 32px; color: var(--ink-2); }

/* ---------- 练题 ---------- */
.pq { max-width: 760px; }
.pq-count { margin: 0 0 8px; font: var(--t-caption); color: var(--muted); }
.pq-bar { height: 3px; margin-bottom: 20px; border-radius: 2px; background: var(--line); overflow: hidden; }
.pq-bar i { display: block; height: 100%; background: var(--accent); transition: width var(--d-fade) var(--ease-out); }
.pq-stem { font: var(--t-reading); font-size: 17px; }
.pq-figure { display: block; max-width: min(100%, 460px); margin: 12px 0; }
.pq-options { display: grid; gap: 8px; margin-top: 16px; }
.pq-option { display: flex; justify-content: flex-start; align-items: flex-start; gap: 12px; width: 100%; min-height: 48px; padding: 10px 14px; border-radius: 12px; text-align: left; color: var(--ink); background: transparent; box-shadow: inset 0 0 0 1px var(--line-strong); }
.pq-option > b { flex: none; line-height: 26px; }
.pq-option .rich > :first-child { margin-top: 0; }
.pq-option .rich > :last-child { margin-bottom: 0; }
.pq-option:active:not(:disabled) { transform: scale(.975); }
.pq-option:disabled { color: var(--ink); background: transparent; }
.pq-option[data-state="picked"] { box-shadow: inset 0 0 0 2px var(--ink-2); }
.pq-option[data-state="right"] { background: var(--accent-soft); box-shadow: inset 0 0 0 2px var(--accent); }
.pq-option[data-state="wrong"] { box-shadow: inset 0 0 0 2px var(--danger); }
.pq-answer { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--line); font: var(--t-reading); }
.pq-answer h2 { margin: 0 0 4px; font: var(--t-control); color: var(--muted); }
.pq-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.pq-actions:empty { display: none; }
.pq-nav { display: flex; justify-content: space-between; gap: 8px; margin-top: 24px; }
.pq-done { margin: 8px 0 0; font: var(--t-title, var(--t-reading)); }

/* ---------- 章节速览 ---------- */
.sec-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 8px; }
.sec-where { margin: 0; flex: 1; min-width: 0; font: var(--t-control); color: var(--muted); }
.sec-head-actions { display: flex; gap: 4px; }
.lec-login { margin-bottom: 8px; }
.lec-list .lp-cap h2::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 10px; border-radius: 50%; background: var(--subject); vertical-align: middle; }
.lec-title { display: block; color: var(--ink); font: var(--t-reading); font-size: 17px; text-decoration: none; }
.lec-parts { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0 16px; margin-top: 4px; }
.lec-part { display: flex; align-items: center; gap: 10px; min-height: 44px; color: var(--ink-2); text-decoration: none; }
.lec-part:active { transform: scale(.975); }
.lec-line { display: flex; align-items: center; gap: 8px; min-width: 0; }
.lec-line .lec-part { flex: 1; min-width: 0; }
.lec-practice { flex: none; display: inline-flex; align-items: center; min-height: 36px; padding: 0 10px; border-radius: 10px; color: var(--accent); font-size: 14px; text-decoration: none; }
.lec-practice:active { transform: scale(.975); }
.lec-practice:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.lec-list .lp-cap { flex-wrap: wrap; }
.lec-next { position: sticky; bottom: 0; display: flex; align-items: center; gap: 8px; width: fit-content; max-width: 100%; margin: 12px auto 0; padding: 6px 8px 6px 16px; background: var(--paper); border-radius: 14px; box-shadow: var(--sh-paper-hover); }
.lec-next[hidden] { display: none; }
.pq-left { margin: 0 0 16px; color: var(--muted); }
.lec-time { flex: none; color: var(--muted); font-variant-numeric: tabular-nums; }
.sec-group { margin-top: 22px; }
.sec-group h2 { margin: 0 0 6px; font: var(--t-heading); }
.sec-item { padding: 12px 0; border-bottom: 1px solid var(--line); }
.sec-item h3 { margin: 0 0 2px; font: 600 15px/1.5 var(--font); color: var(--ink-2); }
.sec-text { margin: 0; font: var(--t-reading); font-size: 17px; }
.sec-formula { font-variant-numeric: tabular-nums; letter-spacing: .01em; }
.sec-cite > summary { min-height: 34px; display: inline-flex; align-items: center; font: var(--t-caption); color: var(--muted); cursor: pointer; }
.sec-cite blockquote { margin: 4px 0 2px; padding-left: 12px; border-left: 2px solid var(--line); font: var(--t-control); color: var(--ink-2); }
.sec-cite small { font: var(--t-caption); color: var(--muted); }
.sec-gaps { margin-top: 18px; font: var(--t-caption); color: var(--muted); }
.sec-near { display: flex; justify-content: space-between; gap: 12px; margin-top: 28px; padding-top: 14px; border-top: 1px solid var(--line); }
.sec-near-link { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; padding: 0 12px; border-radius: 12px; font: var(--t-control); color: var(--ink-2); text-decoration: none; }
.sec-near-link.next { margin-left: auto; }
@media (hover: hover) and (pointer: fine) { .sec-near-link:hover { background: var(--control); } }

/* 知识图：根 → 类别 → 条目，从左往右；连线用边框画 */
.map-scroll { overflow-x: auto; padding: 12px 2px 16px; }
.map-branch { display: flex; align-items: center; }
.map-children { display: flex; flex-direction: column; gap: 10px; padding-left: 28px; position: relative; }
.map-children > .map-branch { position: relative; }
.map-children > .map-branch::before { content: ""; position: absolute; left: -28px; top: 50%; width: 28px; border-top: 1.5px solid var(--line-strong); }
.map-children::before { content: ""; position: absolute; left: 0; top: var(--top, 0); bottom: var(--bottom, 0); border-left: 1.5px solid var(--line-strong); }
.map-children > .map-branch:first-child::after, .map-children > .map-branch:last-child::after { content: ""; position: absolute; left: -29.5px; width: 3px; background: var(--paper); }
.map-children > .map-branch:first-child::after { top: 0; height: calc(50% - 1px); }
.map-children > .map-branch:last-child::after { bottom: 0; height: calc(50% - 1px); }
.map-children > .map-branch:only-child::after { display: none; }
.map-children:has(> .map-branch:only-child)::before { display: none; }
.map-node { flex: none; max-width: 340px; padding: 10px 14px; border-radius: 14px; font: var(--t-control); line-height: 1.6; text-align: left; white-space: normal; color: var(--ink); background: var(--paper); box-shadow: inset 0 0 0 1px var(--line); }
.map-root { font: 600 17px/1.4 var(--font); background: var(--ink); color: var(--paper); box-shadow: none; }
.map-cat { font: 600 14px/1.4 var(--font); background: var(--control); box-shadow: none; }
.map-rel { position: absolute; left: -26px; top: calc(50% - 18px); font: 400 11px/1 var(--font); color: var(--muted); }
button.map-leaf { position: relative; min-height: 0; display: block; }
.map-leaf[data-hidden="true"] .map-text { visibility: hidden; }
.map-mask { display: none; }
.map-leaf[data-hidden="true"] .map-mask { display: grid; place-items: center; position: absolute; inset: 0; border-radius: 14px; background: repeating-linear-gradient(135deg, var(--control) 0 6px, var(--paper) 6px 12px); color: var(--muted); font: var(--t-caption); }
.map-leaf[data-hidden="false"] { box-shadow: inset 0 0 0 1.5px var(--accent); }
.map-bar { display: flex; align-items: center; gap: 4px; margin-top: 12px; }
.map-count { flex: 1; font: var(--t-control); color: var(--ink-2); font-variant-numeric: tabular-nums; }

/* ---------- 资料原页 ---------- */
.pdf-paper .lp-head { row-gap: 6px; }
.pdf-nav { display: flex; align-items: center; gap: 2px; }
.pdf-page-no { min-width: 64px; text-align: center; font: var(--t-control); font-variant-numeric: tabular-nums; }
.pdf-zoombox { display: flex; }
.pdf-zoom { font: 400 20px/1 var(--font); }
.pdf-save { min-width: 7em; font: var(--t-caption); color: var(--muted); text-align: right; }
.pdf-save[data-state="conflict"], .pdf-save[data-state="local-error"] { color: var(--danger); }
.pdf-tools { flex-basis: 100%; display: flex; align-items: center; gap: 4px; flex-wrap: wrap; margin-left: -10px; }
.pdf-tool { min-height: 40px; padding: 0 14px 0 10px; border-radius: 12px; background: transparent; color: var(--ink-2); }
.pdf-tool[aria-pressed="true"] { background: var(--accent-tint); color: var(--accent-ink); }
.pdf-colors { display: flex; gap: 2px; margin: 0 6px; }
.pdf-colors[hidden] { display: none; }
.pdf-color { width: 36px; height: 36px; min-height: 0; padding: 0; border-radius: 50%; background: transparent; display: grid; place-items: center; }
.pdf-color::after { content: ""; width: 18px; height: 18px; border-radius: 50%; background: var(--c); }
.pdf-color[aria-pressed="true"] { box-shadow: inset 0 0 0 2px var(--line-strong); }
.lp-body.pdf-body { display: flex; flex-direction: column; gap: 0; padding: 0; overflow: hidden; }
.pdf-main { position: relative; flex: 1; min-height: 0; display: flex; }
.lp-body.pdf-body > * { max-width: none; }
.pdf-conflict { flex: none; margin: 8px 16px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pdf-conflict[hidden] { display: none; }
.pdf-conflict p { margin: 0; flex: 1 1 14em; }
.pdf-stage { position: relative; flex: 1; min-width: 0; overflow: auto; background: var(--env); padding: 16px; overscroll-behavior: contain; }
.pdf-sheet { position: relative; margin: 0 auto; background: var(--paper); box-shadow: var(--sh-paper); }
.pdf-img { display: block; width: 100%; height: 100%; user-select: none; -webkit-user-select: none; }
.pdf-ink { position: absolute; inset: 0; touch-action: pan-x pan-y pinch-zoom; }
.pdf-stage[data-tool="pen"] .pdf-ink, .pdf-stage[data-tool="eraser"] .pdf-ink, .pdf-stage[data-tool="select"] .pdf-ink { cursor: crosshair; }
.pdf-box { position: absolute; border: 2px solid var(--accent); border-radius: 6px; background: var(--accent-soft); pointer-events: none; }
.pdf-ask-toggle { min-height: 40px; padding: 0 14px 0 10px; border-radius: 12px; }
.pdf-ask-toggle[aria-expanded="true"] { background: var(--accent-tint); color: var(--accent-ink); }
/* 问老师：平时收起，框完题或点“问老师”才从右边弹出，盖在原页上 */
.pdf-side { position: absolute; z-index: 2; top: 12px; right: 12px; bottom: 12px; width: min(360px, calc(100% - 24px)); overflow-y: auto; padding: 14px 20px 24px; background: var(--paper); border-radius: 18px; box-shadow: var(--sh-float, var(--sh-paper)); }
.pdf-side[hidden] { display: none; }
.pdf-side-close { float: right; margin: -6px -10px 0 0; }
.pdf-side h2 { margin: 0 0 8px; font: var(--t-heading); }
.pdf-hint, .pdf-note { font: var(--t-caption); color: var(--muted); }
.pdf-ask > .quiet { margin-left: -12px; }
.pdf-crop { position: relative; overflow: hidden; border-radius: 10px; box-shadow: inset 0 0 0 1px var(--line); max-height: 200px; }
.pdf-crop img { position: absolute; display: block; max-width: none; }
.pdf-ask-row { display: flex; align-items: center; gap: 8px; margin: 10px 0; }
.pdf-subject { font: var(--t-control); }
.pdf-question { width: 100%; font: var(--t-body); margin-bottom: 10px; }
.pdf-ask .primary, .pdf-thread .primary { width: 100%; }
.pdf-past { margin-top: 26px; }
.pdf-past-row { display: flex; flex-direction: column; align-items: flex-start; gap: 0; width: 100%; min-height: 52px; padding: 8px 10px; border-radius: 12px; background: transparent; text-align: left; white-space: normal; }
.pdf-past-row b { font: 600 13px/1.4 var(--font); color: var(--muted); }
.pdf-past-row span { font: var(--t-control); color: var(--ink); }
@media (hover: hover) and (pointer: fine) { .pdf-past-row:hover { background: var(--control); } }
.pdf-thread > .text-button { margin-left: -8px; }
.pdf-turn { padding: 12px 0; border-bottom: 1px solid var(--line); }
.pdf-q { margin: 0 0 6px; font: 600 15px/1.55 var(--font); }
.pdf-a { font: var(--t-body); }
.pdf-thread .pdf-question { margin-top: 12px; }
.pdf-readonly { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.pdf-readonly .pdf-img { height: auto; box-shadow: var(--sh-paper); border-radius: 6px; }
.pdf-text h2 { margin: 0 0 8px; font: var(--t-heading); }
.pdf-text p { white-space: pre-wrap; font: var(--t-control); }

@media (max-width: 900px), (orientation: portrait) {
  .pdf-side { top: auto; left: 8px; right: 8px; bottom: 8px; width: auto; max-height: 72%; }
  .pdf-readonly { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 600px) {
  .lib-up { grid-template-columns: minmax(0, 1fr) 80px; }
  .lib-up-state { grid-column: 1 / -1; text-align: left; }
  .lib-file-actions { margin: -8px 0 8px 60px; }
  .lib-pack { padding-left: 6px; }
  .pdf-save:is([data-state="saved"], [data-state="dirty"], [data-state="saving"]) { display: none; }
  .pdf-ask-toggle span { display: none; }
  .pdf-tools { flex-wrap: nowrap; gap: 0; overflow-x: auto; scrollbar-width: none; }
  .pdf-tool { padding: 0 9px 0 7px; flex: none; }
  .pdf-ask-toggle { padding: 0 10px; }
}

.pq-kind { display: inline-block; margin: 0 0 10px; padding: 3px 12px; border-radius: 999px; font: var(--t-caption); font-weight: 600; color: var(--accent-ink); background: var(--accent-tint); }
.lp-body:has(> .pq) { transition: padding-right var(--d-space) var(--ease-space); }
.pq-sheet { position: absolute; z-index: 5; top: 12px; right: 12px; bottom: 12px; width: min(46vw, 480px); display: flex; flex-direction: column; border-radius: var(--r-paper); background: var(--paper); box-shadow: var(--sh-float); overflow: hidden; }
.pq-sheet-bar { flex: none; display: flex; align-items: center; gap: 4px; padding: 8px 8px 8px 12px; border-bottom: 1px solid var(--line); }
.pq-sheet-close { margin-left: auto; }
.pq-sheet-area { position: relative; flex: 1; min-height: 0; overflow: hidden; }
.pq-ink { display: block; touch-action: none; cursor: crosshair; }
@media (min-width: 801px) {
  .lp-body.pq-split { padding-right: calc(min(46vw, 480px) + 36px); }
}
@media (max-width: 800px) {
  .pq-sheet { top: 8px; right: 8px; bottom: 8px; left: 8px; width: auto; }
}