/* 错题本 · 简洁扁平主题 */
:root {
    --primary: #0d9488;
    --primary-dark: #0f766e;
    --primary-soft: #f0fdfa;
    --primary-line: #99f6e4;
    --text: #0f172a;
    --text-2: #334155;
    --muted: #64748b;
    --muted-2: #94a3b8;
    --line: #e2e8f0;
    --line-2: #f1f5f9;
    --bg: #f8fafc;
    --good: #16a34a;
    --good-soft: #f0fdf4;
    --fair: #2563eb;
    --fair-soft: #eff6ff;
    --weak: #d97706;
    --weak-soft: #fffbeb;
    --wrong: #dc2626;
    --wrong-soft: #fef2f2;
    --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    font-size: 14px;
    line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }
img { max-width: 100%; display: block; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

/* ---------- 顶栏 ---------- */
.topbar { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid var(--line); }
.topbar-in { max-width: 960px; margin: 0 auto; height: 56px; padding: 0 16px; display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 16px; }
.brand i { color: var(--primary); }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.ai-engine-switch { display: flex; gap: 4px; padding: 2px; background: var(--line-2); border-radius: 8px; }
.ai-engine-btn { border: 0; background: transparent; font-size: 11px; font-weight: 600; padding: 4px 8px; border-radius: 6px; cursor: pointer; color: var(--muted); line-height: 1.2; }
.ai-engine-btn.active { background: #fff; color: var(--primary-dark); box-shadow: 0 1px 2px rgba(0,0,0,.06); }
.student-switch { display: flex; align-items: center; gap: 8px; height: 36px; padding: 0 10px 0 4px; border: 1px solid var(--line); border-radius: 18px; background: #fff; }
.student-switch:hover { border-color: var(--primary-line); }
.student-switch .who b { font-size: 14px; font-weight: 600; }
.student-switch .who span { font-size: 12px; color: var(--muted); margin-left: 4px; }
.student-switch .caret { font-size: 11px; color: var(--muted-2); }
.icon-link { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 18px; border: 1px solid var(--line); color: var(--muted); }
.icon-link:hover { color: var(--primary); border-color: var(--primary-line); }
.avatar { width: 28px; height: 28px; border-radius: 50%; background: var(--primary); color: #fff; display: inline-grid; place-items: center; font-size: 13px; font-weight: 700; flex-shrink: 0; }
@media (max-width: 480px) { .student-switch .who span { display: none; } }

.view { max-width: 960px; margin: 0 auto; padding: 20px 16px 60px; }

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    height: 36px; padding: 0 14px; border-radius: 8px; font-size: 14px; white-space: nowrap;
    border: 1px solid var(--line); background: #fff; color: var(--text-2); transition: border-color .15s, background .15s, color .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn[disabled] { opacity: .5; pointer-events: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: #fff; }
.btn-soft, .btn-teal { background: var(--primary-soft); border-color: var(--primary-line); color: var(--primary-dark); }
.btn-ghost { border-color: transparent; color: var(--muted); }
.btn-ghost:hover { background: var(--line-2); border-color: transparent; color: var(--text); }
.btn-danger { color: var(--wrong); }
.btn-danger:hover { border-color: #fecaca; color: var(--wrong); background: var(--wrong-soft); }
.btn-sm { height: 30px; padding: 0 10px; font-size: 13px; }
.btn-lg { height: 44px; padding: 0 20px; font-size: 15px; }
.btn-block { width: 100%; }
.btn-icon { width: 36px; padding: 0; }

/* ---------- 表单 ---------- */
.field { display: block; margin-bottom: 14px; }
.label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.label small { color: var(--muted-2); margin-left: 4px; }
.input, .textarea, .select { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: #fff; outline: none; font-size: 14px; }
.input, .select { height: 38px; }
.input:focus, .textarea:focus, .select:focus { border-color: var(--primary); }
.textarea { min-height: 84px; resize: vertical; line-height: 1.6; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.row-between { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 640px) { .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); } }

/* ---------- 标签 ---------- */
.chips { display: flex; gap: 6px; flex-wrap: wrap; }
.chips.scroll { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
.chips.scroll::-webkit-scrollbar { display: none; }
.chip { height: 30px; padding: 0 12px; border-radius: 15px; font-size: 13px; background: #fff; border: 1px solid var(--line); color: var(--text-2); white-space: nowrap; display: inline-flex; align-items: center; gap: 5px; }
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }
.chip i { font-size: 12px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #fff; }
.seg button { height: 32px; padding: 0 14px; font-size: 13px; color: var(--text-2); }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.active { background: var(--primary); color: #fff; }

.badge { display: inline-flex; align-items: center; gap: 4px; padding: 0 8px; height: 22px; border-radius: 4px; font-size: 12px; white-space: nowrap; }
.b-good, .b-mastered { background: var(--good-soft); color: var(--good); }
.b-fair, .b-learning { background: var(--fair-soft); color: var(--fair); }
.b-weak { background: var(--weak-soft); color: var(--weak); }
.b-new { background: var(--primary-soft); color: var(--primary-dark); }
.b-unknown, .b-subject { background: var(--line-2); color: var(--muted); }
.b-wrong { background: var(--wrong-soft); color: var(--wrong); }
.tag { display: inline-flex; align-items: center; gap: 4px; padding: 2px 8px; min-height: 22px; line-height: 1.4; border-radius: 4px; max-width: 100%; font-size: 12px; background: var(--primary-soft); color: var(--primary-dark); }
.tag.kp:hover { text-decoration: underline; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }

/* ---------- 页面结构 ---------- */
.page-h { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.page-h h1 { font-size: 20px; font-weight: 700; }
.page-h p { color: var(--muted); font-size: 13px; margin-top: 2px; }
.page-h .back { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.page-h .back:hover { color: var(--primary); }

.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.card + .card, .card + .section-title { margin-top: 12px; }
.card-h { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 12px; }
.card-h h3 { font-size: 15px; font-weight: 700; display: flex; align-items: center; gap: 6px; }
.card-h h3 i { color: var(--primary); font-size: 14px; }
.card-h a.more { font-size: 13px; color: var(--primary); }
.section-title { font-size: 14px; font-weight: 700; margin: 20px 0 10px; display: flex; align-items: center; gap: 6px; }
.section-title i { color: var(--primary); }

.empty { text-align: center; padding: 28px 12px; color: var(--muted); }
.empty .art { font-size: 30px; color: var(--primary); margin-bottom: 10px; }
.empty h4 { color: var(--text); font-size: 15px; margin-bottom: 4px; }
.empty p { font-size: 13px; max-width: 380px; margin: 0 auto 14px; }
.loading-block { padding: 40px 0; text-align: center; color: var(--muted-2); }
.spinner { width: 26px; height: 26px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--primary); animation: spin .8s linear infinite; margin: 0 auto 10px; }
@keyframes spin { to { transform: rotate(360deg); } }

.notice { display: flex; gap: 8px; align-items: flex-start; padding: 10px 12px; border-radius: 8px; background: var(--primary-soft); border: 1px solid var(--primary-line); color: var(--primary-dark); font-size: 13px; }
.notice.warn { background: var(--weak-soft); border-color: #fde68a; color: #92400e; }
.notice i { margin-top: 3px; }

/* ---------- 首页 ---------- */
.today { display: flex; align-items: center; gap: 12px; padding: 14px 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); flex-wrap: wrap; }
.today .hello { flex: 1; min-width: 200px; }
.today .hello b { font-size: 17px; }
.today .hello p { color: var(--muted); font-size: 13px; }
.today.due { border-color: var(--primary-line); background: var(--primary-soft); }
.entry-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
@media (max-width: 720px) { .entry-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; } }
.entry { display: flex; flex-direction: column; gap: 6px; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); transition: border-color .15s; min-height: 118px; }
.entry:hover { border-color: var(--primary); }
.entry .top { display: flex; align-items: center; justify-content: space-between; }
.entry .ic { width: 36px; height: 36px; border-radius: 8px; display: grid; place-items: center; font-size: 16px; background: var(--primary-soft); color: var(--primary); }
.entry .count { font-size: 20px; font-weight: 700; color: var(--text); }
.entry .count small { font-size: 12px; font-weight: 400; color: var(--muted); margin-left: 2px; }
.entry b { font-size: 15px; }
.entry p { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.entry.main { border-color: var(--primary); }
.entry.main .ic { background: var(--primary); color: #fff; }
.home-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px; margin-top: 12px; }
.home-grid .card + .card { margin-top: 0; }
@media (max-width: 760px) { .home-grid { grid-template-columns: minmax(0, 1fr); } }

.weak-row { display: flex; align-items: center; gap: 10px; padding: 9px 0; border-bottom: 1px solid var(--line-2); cursor: pointer; }
.weak-row:last-child { border-bottom: none; }
.weak-row .nm { flex: 1; min-width: 0; }
.weak-row .nm b { display: block; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.weak-row .nm span { font-size: 12px; color: var(--muted); }
.weak-row .bar { width: 80px; flex-shrink: 0; }
.bar { height: 6px; border-radius: 3px; background: var(--line-2); overflow: hidden; width: 100%; }
.bar .fill { height: 100%; background: var(--primary); }
.bar.good .fill { background: var(--good); }
.bar.fair .fill { background: var(--fair); }
.bar.weak .fill { background: var(--weak); }
.pct { font-size: 13px; color: var(--text-2); width: 40px; text-align: right; flex-shrink: 0; }

/* ---------- 错题列表 ---------- */
.toolbar { display: flex; flex-direction: column; gap: 10px; margin-bottom: 14px; }
.search { position: relative; flex: 1; min-width: 160px; }
.search i { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--muted-2); font-size: 13px; }
.search .input { padding-left: 32px; }
.m-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.m-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; cursor: pointer; display: flex; flex-direction: column; transition: border-color .15s; }
.m-card:hover { border-color: var(--primary); }
.m-thumb { height: 120px; background: var(--bg); border-bottom: 1px solid var(--line-2); overflow: hidden; position: relative; }
.m-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.m-thumb .txt { padding: 12px; font-size: 13px; color: var(--text-2); max-height: 120px; overflow: hidden; }
.m-thumb .star { position: absolute; top: 8px; right: 8px; color: var(--weak); font-size: 13px; }
.m-body { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.m-title { font-weight: 600; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.m-meta { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 2px 8px; font-size: 12px; color: var(--muted-2); margin-top: auto; }
.m-card .tags .tag { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: inline-block; }
@media (max-width: 560px) { .m-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; } .m-thumb { height: 92px; } .m-body { padding: 8px 10px 10px; } }

.m-list-row { display: flex; gap: 10px; align-items: center; padding: 9px 0; border-bottom: 1px solid var(--line-2); cursor: pointer; }
.m-list-row:last-child { border-bottom: none; }
.m-list-row:hover b { color: var(--primary); }
.m-list-row .th { width: 44px; height: 44px; border-radius: 8px; overflow: hidden; background: var(--line-2); flex-shrink: 0; display: grid; place-items: center; color: var(--muted-2); }
.m-list-row .th img { width: 100%; height: 100%; object-fit: cover; }
.m-list-row .tx { flex: 1; min-width: 0; }
.m-list-row .tx b { display: block; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.m-list-row .tx span { font-size: 12px; color: var(--muted); }

/* ---------- 错题详情 ---------- */
.block { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; background: #fff; }
.block + .block { margin-top: 10px; }
.block-h { font-size: 13px; font-weight: 700; margin-bottom: 6px; display: flex; align-items: center; gap: 6px; color: var(--text-2); }
.block.wrong { border-left: 3px solid var(--wrong); }
.block.wrong .block-h { color: var(--wrong); }
.block.right { border-left: 3px solid var(--good); }
.block.right .block-h { color: var(--good); }
.block.reason { border-left: 3px solid var(--weak); background: var(--weak-soft); border-color: #fde68a; }
.block.reason .block-h { color: #b45309; }
.imgs { display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 8px; margin-bottom: 8px; }
.imgs img { width: 100%; height: 110px; object-fit: cover; border-radius: 6px; cursor: zoom-in; border: 1px solid var(--line); }
.imgs.lg { grid-template-columns: minmax(0, 1fr); }
.imgs.lg img { height: auto; max-height: 560px; object-fit: contain; }
.progress-dots { display: flex; gap: 4px; }
.progress-dots span { width: 18px; height: 6px; border-radius: 3px; background: var(--line); }
.progress-dots span.on { background: var(--good); }

.md { font-size: 15px; line-height: 1.8; word-break: break-word; }
.md.small { font-size: 13.5px; }
.md p + p, .md ul, .md ol { margin-top: 4px; }
.md ul, .md ol { padding-left: 20px; }
.md h4 { font-size: 15px; margin: 8px 0 2px; }
.md .katex-display { margin: 6px 0; overflow-x: auto; overflow-y: hidden; }
.md code { background: var(--line-2); padding: 0 4px; border-radius: 4px; font-size: 13px; }

/* ---------- 上传 ---------- */
.up-group { margin-bottom: 14px; }
.up-head { display: flex; align-items: baseline; gap: 8px; margin-bottom: 8px; }
.up-head .dot { font-size: 13px; font-weight: 700; color: var(--primary); }
.up-head b { font-size: 14px; }
.up-head span { font-size: 12px; color: var(--muted-2); }
.uploader { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 8px; }
.up-item, .up-add { position: relative; aspect-ratio: 1 / 1; border-radius: 8px; overflow: hidden; }
.up-item { border: 1px solid var(--line); background: var(--bg); }
.up-item img { width: 100%; height: 100%; object-fit: cover; cursor: zoom-in; }
.up-item .rm { position: absolute; top: 4px; right: 4px; width: 22px; height: 22px; border-radius: 50%; background: rgba(15, 23, 42, .55); color: #fff; font-size: 11px; display: grid; place-items: center; }
.up-item .idx { position: absolute; left: 4px; bottom: 4px; background: rgba(15, 23, 42, .55); color: #fff; font-size: 11px; padding: 0 6px; border-radius: 4px; }
.up-item .up-spin { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(255, 255, 255, .7); }
.up-item .up-spin .spinner { width: 22px; height: 22px; margin: 0; }
.up-add { border: 1px dashed #cbd5e1; background: #fff; color: var(--muted); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; font-size: 12px; }
.up-add:hover { border-color: var(--primary); color: var(--primary); }
.up-add i { font-size: 20px; }

.ai-bar { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: 10px; background: var(--primary-soft); border: 1px solid var(--primary-line); flex-wrap: wrap; }
.ai-bar .ic { color: var(--primary); font-size: 18px; }
.ai-bar .tx { flex: 1; min-width: 180px; }
.ai-bar .tx b { display: block; }
.ai-bar .tx span { font-size: 12.5px; color: var(--muted); }
.err-types { display: flex; flex-wrap: wrap; gap: 6px; }
.stars { display: inline-flex; gap: 2px; }
.stars button { font-size: 16px; color: var(--line); }
.stars button.on { color: var(--weak); }
.preview-box { margin-top: 8px; padding: 12px; border-radius: 8px; background: var(--bg); border: 1px dashed var(--line); }

.sticky-actions { position: sticky; bottom: 0; z-index: 20; margin-top: 14px; padding: 10px 0; background: var(--bg); border-top: 1px solid var(--line); display: flex; gap: 8px; justify-content: flex-end; align-items: center; }
@media (max-width: 640px) { .sticky-actions .btn { flex: 1; } }

/* ---------- 知识点 ---------- */
.km-summary { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.km-summary button { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; text-align: left; }
.km-summary button.active { border-color: var(--primary); background: var(--primary-soft); }
.km-summary b { font-size: 20px; display: block; line-height: 1.3; }
.km-summary span { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 5px; }
.km-summary .d { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
@media (max-width: 560px) { .km-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.d-good { background: var(--good); }
.d-fair { background: var(--fair); }
.d-weak { background: var(--weak); }
.d-unknown { background: #cbd5e1; }
.book { margin-top: 16px; }
.book-h { display: flex; align-items: center; gap: 8px; cursor: pointer; padding: 2px 0 8px; }
.book-h h3 { font-size: 15px; }
.book-h .small { margin-left: auto; }
.book-h .caret { color: var(--muted-2); font-size: 12px; transition: transform .2s; }
.book.closed .caret { transform: rotate(-90deg); }
.book.closed .book-body { display: none; }
.chapter { background: #fff; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.chapter + .chapter { margin-top: 8px; }
.chapter-h { padding: 9px 14px; font-weight: 600; font-size: 13.5px; display: flex; align-items: center; justify-content: space-between; gap: 8px; background: var(--bg); border-bottom: 1px solid var(--line); }
.chapter-h .mini { display: flex; gap: 3px; }
.chapter-h .mini i { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
.kp-row { display: flex; align-items: center; gap: 10px; padding: 9px 14px; border-bottom: 1px solid var(--line-2); cursor: pointer; }
.kp-row:last-child { border-bottom: none; }
.kp-row:hover { background: var(--bg); }
.kp-row .nm { flex: 1; min-width: 0; }
.kp-row .nm small { display: block; color: var(--muted-2); font-size: 12px; }
.kp-row .bar { width: 100px; flex-shrink: 0; }
@media (max-width: 560px) { .kp-row .bar { width: 56px; } }

.ring { --p: 0; --c: var(--primary); width: 96px; height: 96px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0; background: conic-gradient(var(--c) calc(var(--p) * 1%), var(--line-2) 0); }
.ring > div { width: 78px; height: 78px; border-radius: 50%; background: #fff; display: grid; place-items: center; text-align: center; }
.ring b { font-size: 20px; line-height: 1.1; display: block; }
.ring span { font-size: 11px; color: var(--muted); }

/* ---------- 试卷 ---------- */
.p-item { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; background: #fff; }
.p-item + .p-item { margin-top: 8px; }
.p-item.is-wrong { border-left: 3px solid var(--wrong); }
.p-item.is-right { border-left: 3px solid var(--good); }
.p-item.is-unknown { border-left: 3px solid var(--weak); }
.p-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.p-no { font-weight: 700; min-width: 28px; }
.judge { display: inline-flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; margin-left: auto; }
.judge button { height: 28px; padding: 0 10px; font-size: 13px; color: var(--muted-2); }
.judge button + button { border-left: 1px solid var(--line); }
.judge button.on-right { background: var(--good); color: #fff; }
.judge button.on-wrong { background: var(--wrong); color: #fff; }
.p-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px; margin-top: 8px; }
.p-grid > div { background: var(--bg); border-radius: 6px; padding: 6px 10px; }
.p-grid label { font-size: 12px; color: var(--muted); display: block; }
.p-grid .md { font-size: 14px; }
.q-figure { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 4px; }
.q-figure img { max-width: min(100%, 420px); max-height: 320px; border: 1px solid var(--line); border-radius: 8px; background: #fff; padding: 4px; cursor: zoom-in; }
.q-figure-svg svg { width: 300px; max-width: 100%; height: auto; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 4px; }
.fig-scan { margin: 6px 0 2px; font-size: 13px; color: var(--muted); }
.fig-scan summary { cursor: pointer; user-select: none; }
.fig-scan .q-figure img { max-width: 240px; max-height: 180px; }
@media print {
    .q-figure-svg svg { border: none; }
    .fig-scan { display: none; }
}
.crop-outer { text-align: center; max-height: 72vh; overflow: auto; background: #f1f5f9; border-radius: 8px; padding: 8px; }
.crop-wrap { position: relative; display: inline-block; touch-action: none; user-select: none; -webkit-user-select: none; cursor: crosshair; line-height: 0; }
.crop-wrap img { display: block; max-width: 100%; pointer-events: none; }
.crop-sel { position: absolute; border: 2px solid var(--primary); background: rgba(13, 148, 136, .14); box-shadow: 0 0 0 9999px rgba(15, 23, 42, .35); pointer-events: none; }
.p-ans { cursor: pointer; border: 1px solid transparent; transition: border-color .15s, background .15s; }
.p-ans:hover { border-color: var(--primary-line); background: var(--primary-soft); }
.p-ans-pen { font-size: 10px; opacity: 0; margin-left: 4px; color: var(--primary); transition: opacity .15s; }
.p-ans:hover .p-ans-pen { opacity: 1; }
.p-confirmed { margin-left: 8px; color: var(--good); font-size: 11px; }
@media (max-width: 560px) { .p-grid { grid-template-columns: minmax(0, 1fr); } }
.p-check { display: inline-flex; align-items: center; gap: 5px; font-size: 13px; cursor: pointer; }
.p-check input { width: 16px; height: 16px; accent-color: var(--primary); }
/* 题号前的「交给 AI 批改」勾选框 */
.p-pick { display: inline-flex; align-items: center; cursor: pointer; margin-right: 2px; }
.p-pick input { width: 18px; height: 18px; accent-color: var(--primary); cursor: pointer; }
.p-item.is-picked { border-color: var(--primary); box-shadow: 0 0 0 2px var(--primary-soft); }
.sticky-actions { flex-wrap: wrap; }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 14px; overflow-x: auto; }
.tabs button { height: 40px; padding: 0 14px; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; white-space: nowrap; }
.tabs button.active { color: var(--primary); border-color: var(--primary); font-weight: 600; }

.steps-run { display: flex; flex-direction: column; gap: 8px; }
.step-run { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line); background: #fff; flex-wrap: wrap; }
.step-run .ic { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--line-2); color: var(--muted-2); font-size: 12px; flex-shrink: 0; }
.step-run.doing { border-color: var(--primary-line); }
.step-run.doing .ic { background: var(--primary-soft); color: var(--primary); }
.step-run.done .ic { background: var(--good); color: #fff; }
.step-run.fail .ic { background: var(--wrong); color: #fff; }
.step-run .tx { flex: 1; }
.step-run .tx span { font-size: 12px; color: var(--muted); display: block; }

.kp-diag { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; background: #fff; }
.kp-diag + .kp-diag { margin-top: 8px; }
.kp-diag .hist { margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); }

/* ---------- 复习 ---------- */
.flash { max-width: 720px; margin: 0 auto; }
.flash-progress { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.flash-progress .bar { flex: 1; }
.flash-actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 14px; }
.flash-actions button { height: 64px; border-radius: 10px; font-size: 14px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; border: 1px solid var(--line); background: #fff; }
.flash-actions button i { font-size: 18px; }
.flash-actions .forgot { color: var(--wrong); }
.flash-actions .forgot:hover { background: var(--wrong-soft); border-color: #fecaca; }
.flash-actions .fuzzy { color: var(--weak); }
.flash-actions .fuzzy:hover { background: var(--weak-soft); border-color: #fde68a; }
.flash-actions .remembered { color: var(--good); }
.flash-actions .remembered:hover { background: var(--good-soft); border-color: #bbf7d0; }
.celebrate { text-align: center; padding: 30px 10px; }
.celebrate .art { font-size: 40px; color: var(--primary); margin-bottom: 10px; }
.celebrate h2 { font-size: 19px; }
.celebrate p { color: var(--muted); margin-top: 6px; }

/* ---------- 练习 ---------- */
.q-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.q-card + .q-card { margin-top: 10px; }
.q-card.right { border-left: 3px solid var(--good); }
.q-card.wrong { border-left: 3px solid var(--wrong); }
.q-top { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; flex-wrap: wrap; }
.q-num { font-weight: 700; color: var(--primary); margin-right: 2px; }
.q-opts { display: flex; flex-direction: column; gap: 4px; margin-top: 8px; }
.q-opts div { padding: 6px 10px; border-radius: 6px; background: var(--bg); }
.q-answer { margin-top: 10px; padding: 10px 12px; border-radius: 8px; background: var(--good-soft); border: 1px solid #bbf7d0; }
.q-mark { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; align-items: center; }
.q-mark .btn.sel-right { background: var(--good); border-color: var(--good); color: #fff; }
.q-mark .btn.sel-wrong { background: var(--wrong); border-color: var(--wrong); color: #fff; }

/* ---------- 计划 ---------- */
.plan-day { display: flex; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line-2); }
.plan-day:last-child { border-bottom: none; }
.plan-day .dn { width: 44px; flex-shrink: 0; text-align: center; font-weight: 700; color: var(--primary); line-height: 1.2; font-size: 18px; }
.plan-day .dn small { display: block; font-size: 11px; font-weight: 400; color: var(--muted); }
.plan-day.done .dn { color: var(--good); }
.plan-day .bd { flex: 1; min-width: 0; }
.plan-task { display: flex; gap: 8px; align-items: flex-start; margin-top: 6px; cursor: pointer; }
.plan-task input { margin-top: 5px; accent-color: var(--primary); width: 15px; height: 15px; flex-shrink: 0; }
.plan-task.done span { color: var(--muted-2); text-decoration: line-through; }
.encourage { text-align: center; padding: 14px; border-radius: 10px; background: var(--primary-soft); color: var(--primary-dark); margin-top: 12px; }

/* ---------- 学生档案 ---------- */
.stu-row { display: flex; align-items: center; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--line-2); }
.stu-row:last-child { border-bottom: none; }
.stu-row .avatar { width: 36px; height: 36px; font-size: 15px; }
.stu-row .tx { flex: 1; }
.stu-row .tx b { display: block; }
.stu-row .tx span { font-size: 12px; color: var(--muted); }
.welcome { max-width: 480px; margin: 40px auto; text-align: center; }
.welcome .art { font-size: 36px; color: var(--primary); margin-bottom: 12px; }
.welcome h1 { font-size: 20px; }
.welcome > p { color: var(--muted); margin: 6px 0 18px; }
.steps3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 16px; font-size: 13px; color: var(--text-2); }
.steps3 div { padding: 12px 6px; border: 1px solid var(--line); border-radius: 8px; }
.steps3 i { display: block; color: var(--primary); font-size: 18px; margin-bottom: 4px; }

/* ---------- 弹窗 / 提示 ---------- */
.modal-mask { position: fixed; inset: 0; z-index: 200; background: rgba(15, 23, 42, .4); display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal { background: #fff; border-radius: 12px; width: 100%; max-width: 480px; max-height: calc(100vh - 40px); display: flex; flex-direction: column; }
.modal.wide { max-width: 720px; }
.modal-h { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.modal-h h3 { font-size: 16px; }
.modal-b { padding: 16px; overflow-y: auto; }
.modal-f { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--line); }
@media (max-width: 560px) {
    .modal-mask { align-items: flex-end; padding: 0; }
    .modal, .modal.wide { max-width: none; border-radius: 12px 12px 0 0; max-height: 90vh; }
    .modal-f .btn { flex: 1; }
}
.toast-wrap { position: fixed; top: 66px; left: 50%; transform: translateX(-50%); z-index: 400; display: flex; flex-direction: column; gap: 6px; align-items: center; pointer-events: none; }
.toast { background: #334155; color: #fff; padding: 8px 16px; border-radius: 8px; font-size: 14px; display: flex; gap: 8px; align-items: center; max-width: 88vw; }
.toast.ok { background: var(--primary-dark); }
.toast.err { background: var(--wrong); }
.busy-mask { position: fixed; inset: 0; z-index: 300; background: rgba(248, 250, 252, .92); display: grid; place-items: center; padding: 20px; }
.busy-card { text-align: center; max-width: 320px; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.busy-card h3 { font-size: 15px; margin-top: 4px; }
.busy-card p { color: var(--muted); font-size: 13px; margin-top: 6px; min-height: 40px; }
.busy-card .timer { font-size: 12px; color: var(--muted-2); }

.viewer { position: fixed; inset: 0; z-index: 500; background: rgba(15, 23, 42, .92); display: flex; align-items: center; justify-content: center; }
.viewer img { max-width: 94vw; max-height: 86vh; object-fit: contain; transition: transform .2s; }
.viewer .v-btn { position: absolute; width: 40px; height: 40px; border-radius: 50%; background: rgba(255, 255, 255, .15); color: #fff; display: grid; place-items: center; }
.viewer .v-close { top: 14px; right: 14px; }
.viewer .v-rot { top: 14px; right: 62px; }
.viewer .v-prev { left: 12px; top: 50%; transform: translateY(-50%); }
.viewer .v-next { right: 12px; top: 50%; transform: translateY(-50%); }
.viewer .v-count { position: absolute; bottom: 18px; left: 50%; transform: translateX(-50%); color: #cbd5e1; font-size: 13px; }

.picker-tree { max-height: 50vh; overflow-y: auto; margin-top: 10px; }
.picker-book { font-weight: 700; font-size: 13px; color: var(--muted); margin: 12px 0 6px; }
.picker-ch { font-size: 13px; margin: 8px 0 6px; color: var(--text-2); }

/* ---------- 登录页 ---------- */
.ctb-landing { background: var(--bg); min-height: 100vh; }
.lp-head { background: #fff; border-bottom: 1px solid var(--line); }
.lp-head .topbar-in { justify-content: space-between; }
.lp-home { font-size: 13px; color: var(--muted); }
.lp-main { max-width: 960px; margin: 0 auto; padding: 48px 16px; display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 40px; align-items: start; }
.lp-hero h1 { font-size: 30px; line-height: 1.35; }
.lp-hero h1 span { color: var(--primary); }
.lp-lead { color: var(--muted); font-size: 15px; margin-top: 12px; line-height: 1.8; }
.lp-steps { margin-top: 24px; display: flex; flex-direction: column; gap: 10px; }
.lp-step { display: flex; gap: 12px; align-items: flex-start; padding: 12px 14px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.lp-step .n { width: 24px; height: 24px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 13px; display: grid; place-items: center; flex-shrink: 0; margin-top: 1px; }
.lp-step b { display: block; }
.lp-step span { font-size: 13px; color: var(--muted); }
.lp-card { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--line); margin: -4px -4px 16px; }
.auth-tab { height: 42px; color: var(--muted); border-bottom: 2px solid transparent; margin-bottom: -1px; font-size: 15px; }
.auth-tab.active { color: var(--primary); border-color: var(--primary); font-weight: 600; }
.auth-note { font-size: 12.5px; color: var(--muted); margin-bottom: 14px; }
.auth-remember { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); margin: -4px 0 14px; }
.auth-remember input { accent-color: var(--primary); }
.auth-msg { min-height: 20px; margin-top: 10px; font-size: 13px; text-align: center; color: var(--muted); }
.auth-msg.ok { color: var(--good); }
.auth-msg.err { color: var(--wrong); }
.auth-privacy { font-size: 12px; color: var(--muted-2); text-align: center; }
.lp-foot { text-align: center; color: var(--muted-2); font-size: 12px; padding: 10px 0 28px; }
@media (max-width: 800px) {
    .lp-main { grid-template-columns: minmax(0, 1fr); padding: 24px 16px; gap: 20px; }
    .lp-hero h1 { font-size: 24px; }
}

/* ---------- 错题表格 ---------- */
.table-scroll { overflow-x: auto; margin-bottom: 16px; }
.data-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; font-size: 13px; }
.data-table th, .data-table td { padding: 10px 12px; border-bottom: 1px solid var(--line-2); text-align: left; vertical-align: top; }
.data-table th { background: var(--line-2); font-size: 12px; color: var(--muted); font-weight: 600; white-space: nowrap; }
.data-table tr[data-go] { cursor: pointer; }
.data-table tr[data-go]:hover { background: #f8fafc; }
.data-table .group-row td { background: #ecfdf5; font-weight: 600; color: var(--primary-dark); cursor: default; }
.data-table .kp-col { max-width: 200px; white-space: normal; }
.data-table .paper-cell { display: flex; gap: 10px; align-items: center; min-width: 200px; }
.data-table .paper-cell .th { width: 40px; height: 40px; border-radius: 6px; overflow: hidden; background: var(--line-2); flex-shrink: 0; display: grid; place-items: center; color: var(--muted-2); }
.data-table .paper-cell .th img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.data-table .paper-cell .tx { min-width: 0; }
.data-table .paper-cell .tx b { display: block; font-weight: 600; }
.data-table .paper-cell .tx span { font-size: 12px; color: var(--muted); }
.wrap-filters { flex-wrap: wrap; gap: 8px; align-items: center; }

/* ---------- 举一反三 · 选题 / 打印 ---------- */
.q-opts-pick { display: flex; flex-direction: column; gap: 8px; margin-top: 12px; }
.opt-pick { display: flex; gap: 10px; align-items: flex-start; text-align: left; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: #fff; width: 100%; }
.opt-pick.selected { border-color: var(--primary); background: var(--primary-soft); }
.opt-pick .L { font-weight: 700; color: var(--primary); min-width: 1.2em; }
.only-print { display: none; }
.print-answer-line { margin-top: 14px; font-size: 14px; border-bottom: 1px dashed var(--line); padding-bottom: 8px; }
.practice-sheet .practice-q { break-inside: avoid; page-break-inside: avoid; margin-bottom: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--line-2); }

.ocr-work { margin-top: 10px; padding: 10px 12px; border-radius: 10px; background: #fbfaf5; border: 1px dashed #d6d3c4; }
.ocr-work .block-h { color: #57534e; }
.ocr-work-text { font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 15px; line-height: 1.8; white-space: pre-wrap; }
.ocr-work .imgs { margin-top: 8px; }
.teacher-note { display: flex; gap: 8px; align-items: flex-start; margin-top: 10px; padding: 8px 12px; border-radius: 8px; font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 15px; color: #b91c1c; background: #fff5f5; border-left: 3px solid #ef4444; }
.teacher-note.right { color: #15803d; background: #f0fdf4; border-left-color: #22c55e; }
.teacher-note .md p { margin: 0; }
.print-head { text-align: center; margin-bottom: 18px; }
.print-head h2 { font-size: 20px; margin-bottom: 6px; }
.print-work { margin-top: 12px; min-height: 96px; border: 1px solid #e5e7eb; border-radius: 6px; padding: 6px 10px; font-size: 14px;
    background: repeating-linear-gradient(transparent 0 31px, #e5e7eb 31px 32px); }
.print-work.tall { min-height: 260px; }
.print-work.mid { min-height: 72px; }
.print-work.short { min-height: 36px; margin-top: 8px; }
.print-kp-head { font-weight: 700; font-size: 15px; margin: 0 0 10px; padding: 4px 10px; background: #ecfdf5; color: #0f766e; border-radius: 6px; }

/* ---------- 知识点 · 学期 ---------- */
.term-badge { font-size: 11px; padding: 1px 8px; border-radius: 99px; font-weight: 600; white-space: nowrap; }
.term-badge.cur { background: var(--primary); color: #fff; }
.term-badge.done { background: var(--good-soft); color: var(--good); }
.term-badge.todo { background: var(--line-2); color: var(--muted); }
.book-current > .book-h h3 { color: var(--primary-dark); }
.future-books { margin-top: 18px; text-align: center; }
.future-books.open { text-align: left; }
.future-books.open > .btn { margin-bottom: 4px; }

/* ---------- 错题本 · 纸张 ---------- */
.nb-wrap { --nb-line: 32px; --nb-ink: #1f2937; max-width: 820px; margin: 0 auto; }
.nb-bar { display: flex; gap: 8px; align-items: center; justify-content: center; flex-wrap: wrap; margin-bottom: 14px; }
.nb-bar .select { width: auto; max-width: 300px; }
.nb-desk { position: relative; padding: 18px 10px 26px; border-radius: 16px; background: linear-gradient(180deg, #eef3ef, #e6ece7); }
.nb-stage { position: relative; perspective: 2400px; }
.nb-tip { text-align: center; margin-top: 10px; }

.nb-page { position: relative; min-height: 960px; padding: 40px 40px 64px 92px; color: var(--nb-ink); background-color: #fffef8; border-radius: 4px 12px 12px 4px;
    box-shadow: 0 1px 0 #e7e2d2, 0 2px 0 #fbf8ee, 0 3px 0 #e7e2d2, 0 5px 0 #f7f3e6, 0 6px 0 #e2dccb, 0 14px 30px rgba(15, 23, 42, .12);
    font-size: 15px; line-height: var(--nb-line); overflow: hidden; }
.nb-lined { background-image:
        linear-gradient(90deg, transparent 70px, #f4a6a6 70px, #f4a6a6 71px, transparent 71px, transparent 74px, #f4a6a6 74px, #f4a6a6 75px, transparent 75px),
        repeating-linear-gradient(180deg, transparent 0, transparent calc(var(--nb-line) - 1px), #d7e6f2 calc(var(--nb-line) - 1px), #d7e6f2 var(--nb-line));
    background-position: 0 0, 0 40px; }
.nb-page::before { content: ""; position: absolute; left: 22px; top: 0; bottom: 0; width: 22px;
    background: radial-gradient(circle at 11px 11px, #e3e8e4 6px, #c9d1cb 6.5px, transparent 7.5px) 0 30px / 22px 64px repeat-y; }
.nb-page::after { content: ""; position: absolute; inset: 0 auto 0 0; width: 18px; background: linear-gradient(90deg, rgba(0, 0, 0, .06), transparent); pointer-events: none; }

.nb-turning { position: absolute; inset: 0 0 auto 0; z-index: 3; transform-origin: left center; backface-visibility: hidden; }
.nb-turn-out { animation: nb-out .65s cubic-bezier(.4, .1, .3, 1) forwards; }
.nb-turn-in { animation: nb-in .65s cubic-bezier(.4, .1, .3, 1) forwards; }
@keyframes nb-out { 0% { transform: rotateY(0); filter: brightness(1); } 100% { transform: rotateY(-100deg); filter: brightness(.75); } }
@keyframes nb-in { 0% { transform: rotateY(-100deg); filter: brightness(.75); } 100% { transform: rotateY(0); filter: brightness(1); } }
.nb-curl { position: absolute; right: 10px; bottom: 26px; width: 44px; height: 44px; border: 0; padding: 0; cursor: pointer; border-radius: 0 0 12px 0; z-index: 4;
    background: linear-gradient(135deg, transparent 50%, #e9e4d3 50%, #f6f2e4 70%, #d9d2bc); box-shadow: -2px -2px 6px rgba(0, 0, 0, .08); transition: width .2s, height .2s; }
.nb-curl:hover { width: 58px; height: 58px; }
.nb-curl:disabled { display: none; }

.nb-cover { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 40px; padding-left: 60px;
    background: radial-gradient(circle at 20% 15%, rgba(255, 255, 255, .35), transparent 40%), linear-gradient(150deg, #9fd6c4, #6fb9a6 60%, #5aa894); color: #134e4a; }
.nb-cover::before { background: radial-gradient(circle at 11px 11px, #f0f5f2 6px, #4f9886 6.5px, transparent 7.5px) 0 30px / 22px 64px repeat-y; }
.nb-cover-label { width: min(380px, 90%); background: #fffef6; border-radius: 10px; padding: 26px 30px; box-shadow: 0 6px 18px rgba(0, 0, 0, .12); border: 2px solid #fff; outline: 1px solid #cfe6dd; outline-offset: -8px; }
.nb-cover-label .t { font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 44px; text-align: center; letter-spacing: 6px; color: #0f766e; line-height: 1.3; }
.nb-cover-label .s { text-align: center; color: #64748b; margin-bottom: 16px; letter-spacing: 4px; }
.nb-cover-label dl { display: grid; grid-template-columns: 52px 1fr; gap: 6px 10px; margin: 0; }
.nb-cover-label dt { color: #64748b; }
.nb-cover-label dd { margin: 0; border-bottom: 1px solid #cbd5e1; font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 17px; min-height: 28px; }
.nb-cover-motto { font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 18px; color: #f0fdfa; letter-spacing: 2px; text-shadow: 0 1px 2px rgba(0, 0, 0, .15); }

.nb-title { font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 26px; text-align: center; line-height: calc(var(--nb-line) * 2); margin: 0; letter-spacing: 8px; }
.nb-toc { list-style: none; padding: 0; margin: 0; }
.nb-toc li { display: flex; align-items: baseline; gap: 8px; cursor: pointer; line-height: var(--nb-line); }
.nb-toc li:hover .nm { color: var(--primary-dark); }
.nb-toc .nm { font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 17px; }
.nb-toc .nm small { font-family: inherit; font-size: 12px; color: #94a3b8; margin-left: 8px; }
.nb-toc .dots { flex: 1; border-bottom: 2px dotted #cbd5e1; transform: translateY(-6px); }
.nb-toc b { font-weight: 600; color: #475569; min-width: 2em; text-align: right; }

.nb-chapter { display: inline-block; margin-bottom: 8px; padding: 0 14px; line-height: 30px; border-radius: 0 16px 16px 0; margin-left: -22px; background: #ccfbf1; color: #0f766e; font-weight: 600; font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 16px; }
.nb-head { display: flex; align-items: baseline; gap: 12px; border-bottom: 2px solid #334155; line-height: var(--nb-line); margin-bottom: 6px; flex-wrap: wrap; }
.nb-kp { flex: 1; min-width: 120px; }
.nb-kp-box { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; }
.nb-kp-box .tags { margin: 0; }
.nb-kp-edit { padding: 2px 8px; font-size: 12px; }
.kp-col-edit { padding: 2px 6px; vertical-align: middle; }
.nb-head .nb-variant { margin-left: auto; padding: 2px 10px; line-height: 1.6; }
.nb-head .nb-del { color: #b91c1c; padding: 2px 8px; }
.nb-head .nb-del:hover { background: #fef2f2; }
.nb-no { font-family: Georgia, "Times New Roman", serif; font-size: 20px; font-weight: 700; color: #0f766e; }
.nb-kp { flex: 1; min-width: 0; font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 16px; color: #334155; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nb-date { font-size: 13px; color: #94a3b8; }
.nb-link { color: #94a3b8; font-size: 13px; }
.nb-link:hover { color: var(--primary); }
.nb-star { position: absolute; top: 14px; right: 18px; color: #f59e0b; }
.nb-stamp { position: absolute; top: 70px; right: 34px; width: 92px; height: 92px; border-radius: 50%; border: 3px double #dc2626; color: #dc2626; display: grid; place-items: center;
    font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 20px; font-weight: 700; transform: rotate(-16deg); opacity: .72; letter-spacing: 2px; pointer-events: none; }

.nb-sec { margin-top: 8px; break-inside: avoid; page-break-inside: avoid; }
.nb-sec h4 { display: inline-flex; gap: 6px; align-items: center; font-size: 14px; font-weight: 700; line-height: 24px; margin: 4px 0; padding: 0 10px 0 8px; border-radius: 4px; }
.nb-sec .nb-body { line-height: var(--nb-line); }
.nb-sec .nb-body .md p { margin: 0; }
.nb-sec.q h4 { background: #e2e8f0; color: #1e293b; }
.nb-sec.wrong h4 { background: #fee2e2; color: #b91c1c; }
.nb-sec.wrong .nb-body { color: #b91c1c; font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 16px; text-decoration: line-through rgba(220, 38, 38, .25); }
.nb-sec.right h4 { background: #dcfce7; color: #15803d; }
.nb-sec.right .nb-body { color: #14532d; }
.nb-sec.ana h4 { background: #dbeafe; color: #1d4ed8; }
.nb-sec.ana .nb-body { color: #1e3a8a; }
.nb-sec.ai h4 { background: #ede9fe; color: #6d28d9; }
.nb-sec.ai .nb-body { color: #312e81; }
.nb-sub { font-weight: 700; font-size: 13px; color: #7c3aed; margin-top: 6px; }
.nb-empty { margin: 0 0 10px; font-size: 13px; color: #78716c; line-height: 1.6; }
.nb-sec.ai .btn { margin-top: 4px; }
.ai-sol { background: #faf5ff; border-color: #e9d5ff; }
.ai-sol .block-h { color: #6d28d9; }
.ai-sol-h { font-weight: 700; font-size: 13px; color: #7c3aed; margin: 10px 0 2px; }
.ai-sol-edit { margin: 4px 0 14px; padding: 12px 14px 2px; border-radius: 10px; background: #faf5ff; border: 1px solid #ede9fe; }
.nb-sec.redo h4 { background: #fef3c7; color: #b45309; }
.nb-blank { width: 100%; }
.nb-figure { margin: 8px 0; line-height: 0; }
.nb-figure img { max-width: min(100%, 360px); max-height: 300px; background: #fff; border: 1px solid #e7e5e4; border-radius: 4px; padding: 4px; mix-blend-mode: multiply; }
.nb-imgs { display: flex; flex-wrap: wrap; gap: 8px; margin: 6px 0; }
.nb-imgs img { max-width: 100%; max-height: 260px; border-radius: 4px; border: 1px solid #e5e7eb; background: #fff; }
.nb-sticky { position: relative; margin: 14px 0 10px 6px; padding: 14px 16px 10px; max-width: 520px; background: #fff7b2; color: #713f12; line-height: 1.75;
    font-family: "KaiTi", "STKaiti", "楷体", serif; font-size: 15px; transform: rotate(-1.2deg); box-shadow: 2px 4px 10px rgba(120, 90, 0, .15); break-inside: avoid; page-break-inside: avoid; }
.nb-sticky .tape { position: absolute; top: -9px; left: 50%; width: 80px; height: 18px; margin-left: -40px; background: rgba(255, 255, 255, .6); border: 1px solid rgba(0, 0, 0, .05); transform: rotate(2deg); }
.nb-sticky .lb { display: inline-block; font-weight: 700; color: #a16207; margin-right: 6px; }
.nb-sticky b { color: #92400e; margin-right: 6px; }
.nb-sticky .md p { margin: 0; }
.nb-review { margin-top: 10px; font-size: 12px; color: #94a3b8; text-align: right; line-height: var(--nb-line); }
.nb-foot { position: absolute; left: 92px; right: 40px; bottom: 18px; display: flex; justify-content: space-between; font-size: 12px; color: #a8a29e; line-height: 20px; }
.nb-foot .pg { font-family: Georgia, serif; }
#nb-print { display: none; }

@media (max-width: 640px) {
    .nb-desk { padding: 8px 0 18px; background: none; }
    .nb-page { min-height: 70vh; padding: 26px 16px 56px 56px; font-size: 14px; }
    .nb-lined { background-image:
            linear-gradient(90deg, transparent 44px, #f4a6a6 44px, #f4a6a6 45px, transparent 45px),
            repeating-linear-gradient(180deg, transparent 0, transparent calc(var(--nb-line) - 1px), #d7e6f2 calc(var(--nb-line) - 1px), #d7e6f2 var(--nb-line)); }
    .nb-page::before { left: 8px; }
    .nb-foot { left: 56px; right: 16px; }
    .nb-stamp { width: 70px; height: 70px; font-size: 16px; right: 14px; }
    .nb-cover-label .t { font-size: 34px; }
    .nb-curl { right: 0; bottom: 18px; }
}

@media print {
    body.practice-print-mode .topbar,
    body.practice-print-mode .no-print,
    body.practice-print-mode .sticky-actions { display: none !important; }
    body.practice-print-mode .view { max-width: none; padding: 0; }
    body.practice-print-mode .only-print { display: block; }
    body.practice-print-mode .practice-sheet { padding: 8px 12px; }
    body.practice-print-mode .practice-q .md { font-size: 14px; }
    body.practice-print-mode .practice-q { margin-bottom: 12px; padding-bottom: 10px; break-inside: avoid; page-break-inside: avoid; }
    body.practice-print-mode .practice-q.is-choice { margin-bottom: 4px; padding-bottom: 4px; break-inside: auto; page-break-inside: auto; }
    body.practice-print-mode .practice-q.print-kp-start:not(:first-child) { break-before: page; page-break-before: always; }
    body.practice-print-mode .print-answer-line { margin-top: 6px; padding-bottom: 4px; }
    body.practice-print-mode .print-work { min-height: 56px; }
    body.practice-print-mode .print-work.mid { min-height: 48px; }
    body.practice-print-mode .print-work.short { min-height: 28px; }
    body.practice-print-mode .print-work.tall { min-height: 128px; }

    body.nb-print-mode > *:not(#nb-print) { display: none !important; }
    body.nb-print-mode { background: #fff; }
    body.nb-print-mode #nb-print { display: block; }
    body.nb-print-mode #nb-print * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
    body.nb-print-mode #nb-print .no-print { display: none !important; }
    body.nb-print-mode #nb-print .nb-page { min-height: 271mm; box-shadow: none; border-radius: 0; break-after: page; page-break-after: always; overflow: visible; padding: 12mm 12mm 16mm 26mm; }
    body.nb-print-mode #nb-print .nb-page:last-child { break-after: auto; page-break-after: auto; }
    /* 紧凑重做：内容少时也铺满一页，页脚贴底（与整本打印一致） */
    body.nb-print-mode #nb-print.nb-print-compact .nb-page.nb-print-sheet {
        min-height: 271mm;
        box-sizing: border-box;
        padding-bottom: 22mm;
    }
    body.nb-print-mode #nb-print.nb-print-compact .nb-page.nb-print-sheet .nb-foot {
        position: absolute;
        left: 26mm;
        right: 12mm;
        bottom: 6mm;
    }
    body.nb-print-mode #nb-print.nb-print-compact .nb-compact-item { break-inside: avoid; page-break-inside: avoid; margin-bottom: 10px; padding-bottom: 8px; border-bottom: 1px dashed #cbd5e1; }
    body.nb-print-mode #nb-print.nb-print-compact .nb-compact-item.nb-compact-short { margin-bottom: 4px; padding-bottom: 4px; break-inside: auto; page-break-inside: auto; }
    body.nb-print-mode #nb-print.nb-print-compact .nb-compact-ans { margin-top: 4px; font-size: 14px; line-height: var(--nb-line); }
    body.nb-print-mode #nb-print.nb-print-compact .nb-compact-head { margin-bottom: 2px; }
    body.nb-print-mode #nb-print.nb-print-compact .nb-compact-head .nb-no { font-size: 16px; }
    body.nb-print-mode #nb-print .nb-foot { left: 26mm; right: 12mm; bottom: 6mm; }
    body.nb-print-mode #nb-print .nb-imgs img { max-height: 70mm; }
    body.nb-print-mode #nb-print.nb-print-compact .nb-imgs img { max-height: 45mm; }

    body.essay-print-mode > *:not(#essay-print) { display: none !important; }
    body.essay-print-mode { background: #fff; }
    body.essay-print-mode #essay-print { display: block; }
    body.essay-print-mode #essay-print * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
    body.essay-print-mode .no-print { display: none !important; }
}
@page { size: A4; margin: 10mm; }

/* ---------- 首页 · 学科卡片 ---------- */
.home-hero {
    margin: -4px -4px 20px;
    border-radius: calc(var(--radius) + 4px);
    background: linear-gradient(135deg, #ecfdf5 0%, #f0fdfa 45%, #fff 100%);
    border: 1px solid var(--primary-line);
    overflow: hidden;
}
.home-hero-in { padding: 22px 20px 20px; }
.home-grade {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 600; color: var(--primary-dark);
    background: rgba(255,255,255,.85); border: 1px solid var(--primary-line);
    padding: 6px 12px; border-radius: 999px; margin-bottom: 12px;
}
.home-title { font-size: 22px; font-weight: 800; letter-spacing: -.02em; margin-bottom: 8px; color: var(--text); }
.home-lead { font-size: 14px; color: var(--muted); max-width: 36em; line-height: 1.65; }
.home-due {
    margin-top: 16px; padding: 12px 14px; border-radius: 10px;
    background: #fff; border: 1px solid var(--line);
    display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
}
.home-due b { color: var(--primary-dark); font-size: 16px; }
.home-section-title {
    font-size: 13px; font-weight: 700; color: var(--muted); text-transform: none;
    letter-spacing: .04em; margin-bottom: 12px;
}
.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 12px;
}
.subject-card {
    position: relative; display: flex; flex-direction: column; align-items: flex-start; gap: 6px;
    padding: 18px 16px 16px; min-height: 118px;
    background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
    transition: transform .15s, box-shadow .15s, border-color .15s;
    overflow: hidden;
}
.subject-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(15, 118, 110, .12);
    border-color: var(--sc, var(--primary-line));
}
.subject-card .sc-glow {
    position: absolute; top: -40px; right: -30px; width: 100px; height: 100px;
    background: radial-gradient(circle, color-mix(in srgb, var(--sc, var(--primary)) 35%, transparent) 0%, transparent 70%);
    pointer-events: none;
}
.subject-card .sc-icon {
    width: 40px; height: 40px; border-radius: 12px;
    display: grid; place-items: center; font-size: 18px;
    background: color-mix(in srgb, var(--sc, var(--primary)) 12%, #fff);
    color: var(--sc, var(--primary));
}
.subject-card .sc-name { font-size: 17px; font-weight: 800; color: var(--text); }
.subject-card .sc-desc { font-size: 12px; color: var(--muted); line-height: 1.45; }
.subject-card.is-disabled {
    opacity: .55; cursor: not-allowed; filter: grayscale(.35);
    pointer-events: none; position: relative;
}
.subject-card.is-disabled .sc-soon {
    position: absolute; top: 10px; right: 10px;
    font-size: 10px; font-weight: 700; color: var(--muted);
    background: var(--line-2); padding: 2px 8px; border-radius: 999px;
}
.kp-row { position: relative; }
.kp-row-acts {
    position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
    display: flex; gap: 4px; opacity: 0; transition: opacity .15s;
}
.kp-row:hover .kp-row-acts { opacity: 1; }
.kp-custom-tag { color: var(--primary-dark); margin-left: 6px; font-weight: 600; }
.kp-row.kp-is-custom .kp-row-acts { opacity: 1; }
.book-mine { border: 1px solid var(--primary-line); margin-bottom: 14px; background: #fff; }
.kp-hint { margin-bottom: 12px; }
@media (max-width: 640px) { .kp-row-acts { opacity: 1; position: static; transform: none; margin-left: auto; } }
.plan-days-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.plan-day-edit { padding: 12px 0; border-bottom: 1px dashed var(--line); }
.plan-day-edit:last-of-type { border-bottom: none; }
.plan-task-edit { display: flex; gap: 6px; align-items: center; margin: 6px 0; }
.plan-task-edit .input { flex: 1; min-width: 0; }

/* ---------- 学科工作台 ---------- */
.hub-banner {
    margin-bottom: 16px; border-radius: var(--radius);
    background: linear-gradient(120deg, color-mix(in srgb, var(--sc, var(--primary)) 18%, #fff), #fff 55%);
    border: 1px solid var(--line);
}
.hub-banner-in { display: flex; align-items: center; gap: 14px; padding: 16px 18px; }
.hub-banner-ic {
    width: 48px; height: 48px; border-radius: 14px; flex-shrink: 0;
    display: grid; place-items: center; font-size: 22px;
    background: color-mix(in srgb, var(--sc, var(--primary)) 15%, #fff);
    color: var(--sc, var(--primary));
}
.hub-banner b { font-size: 17px; display: block; margin-bottom: 2px; }
.hub-banner p { font-size: 13px; color: var(--muted); margin: 0; }
.hub-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}
.hub-grid-cn { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); max-width: 520px; }
.hub-tile-main { border-color: var(--primary-line); background: linear-gradient(180deg, var(--primary-soft), #fff); }
.hub-tile {
    position: relative; display: flex; flex-direction: column; gap: 4px;
    padding: 14px 12px 12px; background: #fff; border: 1px solid var(--line);
    border-radius: var(--radius); min-height: 108px;
    transition: border-color .15s, box-shadow .15s;
}
.hub-tile:hover { border-color: var(--primary-line); box-shadow: 0 4px 14px rgba(0,0,0,.06); }
.hub-tile .ht-ic {
    width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
    background: var(--primary-soft); color: var(--primary-dark); font-size: 15px; margin-bottom: 2px;
}
.hub-tile b { font-size: 14px; font-weight: 700; }
.hub-tile p { font-size: 12px; color: var(--muted); line-height: 1.45; margin: 0; flex: 1; }
.hub-tile .ht-badge {
    position: absolute; top: 10px; right: 10px;
    font-size: 11px; font-weight: 700; color: var(--primary-dark);
    background: var(--primary-soft); padding: 2px 7px; border-radius: 999px;
}
.scope-pill {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 13px; font-weight: 600; color: var(--primary-dark);
    background: var(--primary-soft); border: 1px solid var(--primary-line);
    padding: 6px 12px; border-radius: 999px;
}
.scope-pill i { opacity: .85; }

/* 作文批改 · 三稿 + 打印 */
.essay-tabs { margin-bottom: 12px; flex-wrap: wrap; }
.essay-sheet-label { font-weight: 800; font-size: 15px; margin-bottom: 10px; color: var(--text); }
.essay-paper, .essay-markup { font-family: "KaiTi", "STKaiti", "FangSong", "PingFang SC", serif; font-size: 16px; line-height: 2; color: var(--text); }
.essay-p { text-indent: 2em; margin: 0 0 0.6em; }
.essay-legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12px; color: var(--muted); margin-bottom: 12px; padding: 8px 10px; background: var(--line-2); border-radius: 8px; }
.essay-markup { word-break: break-word; }
.essay-markup .essay-p { text-indent: 2em; margin: 0 0 0.85em; }
.em-pair { white-space: nowrap; }
.em-ins, .em-rep-new { color: #15803d; text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 4px; }
.em-del, .em-rep-old { color: #dc2626; text-decoration: line-through; text-decoration-thickness: 1.5px; }
.em-comment { color: #92400e; font-weight: 600; }
.em-off { display: none; }
.essay-adopt { display: inline-block; margin: 0 2px 0 1px; font-size: 11px; line-height: 1.4; padding: 0 5px; border-radius: 6px; border: 1px solid var(--line); background: #fff; color: var(--muted); vertical-align: 1px; }
.essay-adopt.on { border-color: var(--primary-line); color: var(--primary-dark); background: var(--primary-soft); }
.essay-teacher-comment { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--line); }
.essay-teacher-comment .etc-h { font-weight: 800; margin-bottom: 8px; }
.essay-final-edit { font-family: "KaiTi", "STKaiti", "FangSong", serif; font-size: 15px; line-height: 1.85; }
.essay-readings { display: flex; flex-direction: column; gap: 12px; }
.essay-reading { padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.essay-reading .er-hd { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.essay-reading p { margin: 4px 0; font-size: 14px; line-height: 1.55; }

#essay-print { display: none; }
.essay-print-page { break-after: page; page-break-after: always; padding: 12mm 14mm; }
.essay-print-page:last-child { break-after: auto; page-break-after: auto; }
.essay-print-brand { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.essay-print-title { text-align: center; font-size: 18px; margin-bottom: 16px; font-family: "KaiTi", "STKaiti", serif; }

.essay-score { text-align: center; padding: 8px 0 4px; }
.essay-score .num { display: block; font-size: 42px; font-weight: 800; color: var(--primary-dark); line-height: 1.1; }
.essay-score .lbl { font-size: 13px; color: var(--muted); }
.essay-dim { padding: 12px 0; border-bottom: 1px solid var(--line-2); }
.essay-dim:last-child { border-bottom: none; }
.essay-dim .hd { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.essay-dim p { margin: 0; font-size: 14px; line-height: 1.55; color: var(--text); }
.essay-dim ul { margin: 8px 0 0; padding-left: 18px; color: var(--muted); }
.essay-rev { padding: 12px 0; border-bottom: 1px dashed var(--line-2); }
.essay-rev:last-child { border-bottom: none; }
.essay-rev blockquote { margin: 0 0 8px; padding: 8px 12px; background: var(--line-2); border-radius: 8px; font-size: 14px; color: var(--text); }
.essay-rev p { margin: 4px 0; font-size: 14px; }
.essay-ex { padding: 8px 10px; background: var(--good-soft); border-radius: 8px; color: var(--text); }
.essay-body { font-size: 15px; line-height: 1.75; white-space: pre-wrap; word-break: break-word; }
.uploader.readonly .up-item { pointer-events: none; }