/* ==========================================================================
   Deep Learning Lab — active-learning features
   Checkpoints, focus mode, review, progress, challenges and the concept map.
   Uses the tokens defined in site.css, so light and dark themes follow automatically.
   ========================================================================== */

/* ------------------------------------------------------------------ checkpoint */
.checkpoint {
  --cpc: var(--aqua);
  margin: 2em 0 .6em; border-radius: var(--radius-lg); background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--cpc) 35%, var(--line)); box-shadow: var(--shadow); overflow: hidden;
}
.cp-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 14px 20px 4px; }
.cp-badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; font-size: .7rem; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase; background: var(--cpc); color: #fff; }
.cp-title { font-weight: 700; font-size: .95rem; color: var(--ink-2); }
.cp-score { margin-left: auto; display: inline-flex; align-items: center; gap: 5px; font-size: .85rem; font-weight: 700; color: var(--green); }
.cp-score .ic { width: 16px; height: 16px; }
.cp-q { padding: 12px 20px 14px; }
.cp-q + .cp-q { border-top: 1px dashed var(--line); }
.cp-qtext { display: flex; gap: 10px; font-weight: 600; max-width: none; }
.cp-qtext p { margin: 0; }
.cp-why { margin-top: 10px; padding: 12px 14px; border-radius: 10px; background: var(--surface-2); font-size: .93rem; max-width: none; animation: pop .25s; }
.cp-why > :first-child { margin-top: 0; } .cp-why > :last-child { margin-bottom: 0; }
.checkpoint.is-done { border-color: color-mix(in srgb, var(--green) 40%, var(--line)); }

.cp-explain { padding: 14px 20px 18px; border-top: 1px solid var(--line); background: linear-gradient(180deg, color-mix(in srgb, var(--cpc) 6%, var(--surface)), var(--surface)); }
.cp-explain-head { display: flex; align-items: center; gap: 7px; flex-wrap: wrap; font-weight: 700; font-size: .9rem; }
.cp-explain-head .ic { color: var(--cpc); }
.cp-explain-head .muted { font-weight: 500; }
.cp-prompt { margin: 6px 0 10px; max-width: none; }
.cp-prompt p { margin: 0; }
.cp-input { width: 100%; min-height: 76px; resize: vertical; padding: 10px 12px; border-radius: 10px; border: 1.5px solid var(--line-2);
  background: var(--surface); color: var(--ink); font: inherit; font-size: .93rem; line-height: 1.5; }
.cp-input:focus { outline: none; border-color: var(--cpc); box-shadow: 0 0 0 3px color-mix(in srgb, var(--cpc) 22%, transparent); }
.cp-input.is-nudged { animation: nudge .45s; border-color: var(--orange); }
@keyframes nudge { 20%, 60% { transform: translateX(-4px); } 40%, 80% { transform: translateX(4px); } }
.cp-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.cp-feedback { margin-top: 12px; padding: 12px 14px; border-radius: 10px; background: var(--surface-2); max-width: none; font-size: .93rem; animation: pop .25s; }
.cp-feedback > :last-child { margin-bottom: 0; }
.cp-feedback.v-solid { background: var(--green-soft); }
.cp-feedback.v-partly { background: var(--yellow-soft); }
.cp-feedback.v-notyet { background: var(--orange-soft); }
.cp-verdict { margin: 0 0 6px !important; font-weight: 800; font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; }
.cp-verdict.v-solid { color: var(--green); } .cp-verdict.v-partly { color: var(--yellow); } .cp-verdict.v-notyet { color: var(--orange); }
.cp-key { margin-top: 12px; padding: 12px 14px; border-radius: 10px; border: 1px dashed color-mix(in srgb, var(--cpc) 45%, var(--line)); animation: pop .25s; }
.cp-key-head { font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 4px; }
.cp-key .prose { max-width: none; font-size: .93rem; }
.cp-key .prose > :first-child { margin-top: 0; } .cp-key .prose > :last-child { margin-bottom: 0; }
.cp-self { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); font-size: .85rem; color: var(--ink-2); }
.cp-self span { margin-right: 4px; }
@media (max-width: 640px) {
  .cp-head, .cp-q, .cp-explain { padding-left: 14px; padding-right: 14px; }
}

/* ------------------------------------------------------------------ quiz retry */
.quiz-foot { padding: 4px 20px 16px; }

/* ------------------------------------------------------------------ lab accessibility */
.px-grid div.kbd-cursor { outline: 2px solid var(--accent); outline-offset: -2px; }
.px-grid:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.widget tr[role="button"]:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ------------------------------------------------------------------ lesson summary on phones */
.lesson-summary.is-clamped { display: -webkit-box; -webkit-line-clamp: 4; line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.lesson-summary.is-clamped > * { display: inline; }
.summary-more { margin: -4px 0 12px; padding: 0; border: 0; background: none; color: var(--accent-ink); font: inherit; font-weight: 600; font-size: .92rem; cursor: pointer; }

/* ------------------------------------------------------------------ case library (Lesson 3.4) */
.cl-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; font-size: .85rem; font-weight: 700; }
.cl-count { color: var(--ink-3); letter-spacing: .04em; text-transform: uppercase; font-size: .75rem; }
.cl-score { display: inline-flex; align-items: center; gap: 6px; color: var(--mod); }
.cl-story { padding: 10px 14px; border-radius: 10px; background: var(--surface-2); font-size: .92rem; }
.cl-evidence { display: grid; gap: 10px; align-content: start; }
.cl-tier { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); }
.cl-tier .muted { margin: 2px 0 8px; font-size: .85rem; }
.cl-tier-head { font-size: .7rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.cl-table { width: 100%; border-collapse: collapse; font-size: .84rem; }
.cl-table th { text-align: left; font-weight: 600; color: var(--ink-2); padding: 3px 8px 3px 0; vertical-align: top; width: 45%; }
.cl-table td { padding: 3px 0; font-family: var(--mono); font-size: .8rem; }
.cl-q { display: grid; gap: 4px; }
.cl-q-title { font-weight: 700; font-size: .92rem; }
.cl-ask { display: grid; gap: 14px; }

/* ------------------------------------------------------------------ predict rounds, precision and leakage labs */
.pr-q { font-weight: 650; font-size: 1rem; line-height: 1.45; }
.pr-dots { display: flex; gap: 6px; }
.pr-dots i { width: 22px; height: 6px; border-radius: 3px; background: var(--line-2); }
.pr-dots i.is-now { background: var(--ink-3); }
.pr-dots i.is-right { background: var(--green); }
.pr-dots i.is-wrong { background: var(--orange); }
.pl-input { width: 100%; max-width: 280px; padding: 8px 12px; border-radius: 10px; border: 1.5px solid var(--line-2); background: var(--surface); color: var(--ink); font: 600 1rem var(--mono); }
.pl-input:focus { outline: none; border-color: var(--accent); }
.pl-presets .w-btn code { font-size: .8rem; background: none; }
.pl-t thead th { font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); }
.pl-t tr.pl-bad td, .pl-t tr.pl-bad th { color: var(--red); }
.ll-toggle .ll-box { display: inline-block; width: 13px; height: 13px; border: 1.5px solid var(--ink-3); border-radius: 3px; }
.ll-toggle.is-on { border-color: var(--mod); color: var(--mod); }
.ll-hist { padding: 10px 12px; border-radius: 10px; background: var(--surface-2); }
.ll-hist .cl-table td { text-align: right; }
.uh-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 4px; }
.uh-grid i { display: block; aspect-ratio: 1; border-radius: 5px; background: var(--surface-3); position: relative; }
.uh-grid i.dead, .uh-key i.dead { background: var(--surface); border: 1.5px dashed var(--red); }
.uh-grid i.dead::after { content: "×"; position: absolute; inset: 0; display: grid; place-items: center; color: var(--red); font-weight: 800; font-size: .8rem; }
.uh-key { display: flex; flex-wrap: wrap; gap: 12px; font-size: .78rem; color: var(--ink-3); }
.uh-key span { display: inline-flex; align-items: center; gap: 6px; }
.uh-key i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

/* ------------------------------------------------------------------ focus mode */
.focus-hidden { display: none !important; }
body.focus-mode .main { padding-bottom: 96px; }
.focus-bar {
  position: fixed; z-index: 40; left: 50%; bottom: 16px; transform: translateX(-50%);
  width: min(760px, calc(100vw - 32px)); display: grid; grid-template-columns: auto minmax(0, 1fr) auto auto; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 16px; background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(10px);
  border: 1px solid var(--line-2); box-shadow: var(--shadow-lg);
}
.focus-where { display: grid; min-width: 0; gap: 3px; }
.focus-count { font-size: .7rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.focus-title { font-weight: 700; font-size: .9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.focus-dots { display: flex; gap: 3px; }
.focus-dots i { flex: 1; max-width: 18px; height: 4px; border-radius: 2px; background: var(--line-2); }
.focus-dots i.is-past { background: var(--mod); opacity: .55; }
.focus-dots i.is-now { background: var(--mod); }
.focus-next-wrap { display: grid; justify-items: end; gap: 2px; }
.focus-bar [data-focus-next] { max-width: 280px; }
.focus-bar [data-focus-next] span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.focus-bar [data-focus-next].is-waiting { background: var(--surface-2); color: var(--ink-2); border-color: var(--line-2); }
.focus-skip { border: 0; background: none; padding: 0; font: inherit; font-size: .75rem; color: var(--ink-3); cursor: pointer; text-decoration: underline; }
.focus-toggle[aria-pressed="true"] { border-color: var(--mod); }
.checkpoint.focus-nudge { animation: nudge .45s; box-shadow: 0 0 0 3px color-mix(in srgb, var(--cpc) 35%, transparent), var(--shadow); }
body.focus-mode .tutor-fab { bottom: 96px; }
@media (max-width: 640px) {
  .focus-bar { grid-template-columns: auto minmax(0, 1fr) auto; gap: 8px; padding: 8px; bottom: 8px; }
  .focus-bar [data-focus-prev] span, .focus-exit { display: none; }
  .focus-bar [data-focus-next] { max-width: 150px; }
  .focus-dots { display: none; }
}
@media print { .focus-bar, .focus-toggle { display: none !important; } .focus-hidden { display: block !important; } }

/* ------------------------------------------------------------------ Python in the browser */
.code-cell .py-status { padding: 6px 16px; font-size: .78rem; color: #9aa3b5; background: var(--code-bg-2); border-top: 1px solid var(--code-line); }
.code-cell .py-out { border-top: 1px solid var(--code-line); background: var(--surface); padding: 10px 14px; }
.code-cell .py-out::before { content: "Your run"; display: block; font-size: .68rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; color: var(--green); margin-bottom: 6px; }
.code-cell.py-ran .code-head::after { content: "✓ ran"; font-size: .7rem; color: #7fd4a0; margin-left: 6px; }
.py-editor { display: block; width: 100%; min-height: 80px; resize: vertical; border: 0; outline: 0; padding: 12px 16px; margin: 0;
.py-editor:focus-visible { box-shadow: inset 0 0 0 2px var(--a2); }
  background: var(--code-bg); color: var(--code-ink); font: 13px/1.6 var(--mono); tab-size: 4; white-space: pre; overflow-x: auto; }
.code-cell.is-editing .py-editor { box-shadow: inset 3px 0 0 #2d6a47; }
.py-out pre { margin: 0 0 8px; padding: 8px 10px; border-radius: 8px; background: var(--surface-2); font: 12.5px/1.5 var(--mono); white-space: pre-wrap; word-break: break-word; max-height: 360px; overflow: auto; }
.py-out pre.py-error { background: var(--red-soft); color: var(--red); }
.py-out .py-fig { display: block; max-width: 100%; margin: 6px 0; border-radius: 8px; background: #fff; }
.py-out .py-none { margin: 0; font-size: .85rem; color: var(--ink-3); }
.exercise { margin: 1.8em 0; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid color-mix(in srgb, var(--green) 30%, var(--line)); box-shadow: var(--shadow); overflow: hidden; }
.exercise .badge-lab { background: var(--green); }
.ex-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; padding: 14px 18px 0; }
.ex-meta { margin-left: auto; font-size: .75rem; color: var(--ink-3); }
.ex-prompt { padding: 8px 18px 4px; max-width: none; }
.ex-editor { margin: 6px 18px; border-radius: 12px; overflow: hidden; border: 1px solid var(--code-line); }
.ex-editor .py-editor { min-height: 140px; }
.ex-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 8px 18px 12px; }
.ex-actions .py-status { font-size: .8rem; color: var(--ink-3); }
.ex-hints { margin: 0 18px 12px; padding: 10px 14px 10px 32px; border-radius: 10px; background: var(--yellow-soft); font-size: .92rem; }
.ex-verdict { margin: 0 18px 12px; padding: 10px 14px; border-radius: 10px; font-size: .93rem; display: flex; gap: 8px; align-items: flex-start; }
.ex-verdict.good { background: var(--green-soft); color: var(--green); }
.ex-verdict.bad { background: var(--orange-soft); }
.exercise > .py-out { margin: 0 18px 16px; }
.exercise.is-passed { border-color: color-mix(in srgb, var(--green) 55%, var(--line)); }

/* ------------------------------------------------------------------ daily review */
.review-link { position: relative; }
.due-badge { position: absolute; top: 2px; right: 0; min-width: 17px; height: 17px; padding: 0 4px; border-radius: 9px; background: var(--orange); color: #fff; font-size: .66rem; font-weight: 800; display: grid; place-items: center; line-height: 1; }
.due-badge.inline { position: static; display: inline-grid; margin-left: 4px; }
.due-badge[hidden] { display: none; }
/* headline numbers on the instructor page */
.rv-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin: 8px 0 18px; }
.rv-stat { padding: 14px 16px; border-radius: 14px; background: var(--surface); border: 1px solid var(--line); display: grid; gap: 2px; }
.rv-stat strong { font-size: 1.7rem; line-height: 1.1; }
.rv-stat span { font-size: .8rem; color: var(--ink-3); }

/* ------------------------------------------------------------------ mastery panel (end of a lesson) */
.mastery-panel { margin: 28px 0 8px; padding: 16px 18px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-sm); }
.mp-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.mp-status { display: inline-flex; align-items: center; gap: 5px; padding: 3px 9px; border-radius: 6px; font: 600 .68rem var(--mono); letter-spacing: .08em; text-transform: uppercase; background: var(--surface-2); color: var(--ink-2); }
.mp-status .ic { width: 14px; height: 14px; }
/* the activation scale: started, practised, mastered */
.mp-status.s-started { background: var(--a1); color: #fff; }
.mp-status.s-practised { background: var(--a2); color: #202d28; }
.mp-status.s-mastered { background: var(--a4); color: #202d28; box-shadow: inset 0 0 0 1px rgba(21, 19, 28, .35); }
.mp-row { display: grid; grid-template-columns: 140px minmax(0, 1fr) 120px; align-items: center; gap: 10px; margin: 6px 0; font-size: .88rem; }
.mp-label { display: inline-flex; align-items: center; gap: 6px; color: var(--ink-2); }
.mp-label .ic { width: 15px; height: 15px; }
.mp-bar { height: 8px; border-radius: 4px; background: var(--surface-3); overflow: hidden; }
.mp-bar span { display: block; height: 100%; background: var(--a2); border-radius: 4px; transition: width .4s; }
.mp-val { font-size: .8rem; color: var(--ink-3); text-align: right; }
.mp-note { margin: 10px 0 0; font-size: .88rem; color: var(--ink-2); }
@media (max-width: 640px) { .mp-row { grid-template-columns: 100px minmax(0, 1fr) 76px; } }

/* ------------------------------------------------------------------ module challenge */

/* ------------------------------------------------------------------ progress page: the certificate name row */
.pg-cert-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.pg-cert-row input, .cert-controls input { flex: 1; min-width: 220px; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); font: inherit; }

/* ------------------------------------------------------------------ certificate */
.cert-page { max-width: 1100px; }
.cert-controls { display: flex; flex-wrap: wrap; gap: 10px; margin: 10px 0 16px; }
.cert-frame { border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-lg); border: 1px solid var(--line); background: #fbfaf6; }
.cert-frame canvas { display: block; width: 100%; height: auto; }
.cert-share { margin-bottom: 14px; padding: 12px 14px; border-radius: 12px; background: var(--green-soft); font-size: .92rem; word-break: break-all; }
.cert-note { margin-top: 10px; }
@media print {
  body.page-certificate .topbar, body.page-certificate .sidebar, body.page-certificate .site-foot, body.page-certificate .plain-hero,
  body.page-certificate .cert-controls, body.page-certificate .cert-share, body.page-certificate .cert-note, body.page-certificate .tutor-fab { display: none !important; }
  body.page-certificate .main { padding: 0 !important; margin: 0 !important; }
  body.page-certificate .cert-frame { box-shadow: none; border: 0; border-radius: 0; }
  @page { size: A4 landscape; margin: 8mm; }
}

/* ------------------------------------------------------------------ instructor view */
.instructor-page { max-width: 1000px; }
.in-token { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 8px 0 20px; }
.in-token input { flex: 1; min-width: 220px; padding: 8px 12px; border-radius: 10px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); font: inherit; }
.in-error { padding: 10px 14px; border-radius: 10px; background: var(--red-soft); color: var(--red); }
.in-hard { padding-left: 22px; }
.in-hard li { margin: 0 0 12px; }
.in-q { font-weight: 600; }
.in-meta { font-size: .85rem; color: var(--ink-3); }
.in-labs { columns: 2; font-size: .88rem; }
@media (max-width: 640px) { .in-labs { columns: 1; } }

/* ------------------------------------------------------------------ lab challenges */
.lab-challenge { margin: 12px 16px 16px; padding: 12px 14px; border-radius: 12px; border: 1px dashed var(--line-2); background: var(--surface); }
.lab-challenge.is-passed { border: 1px solid var(--a2); }
.lch-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.lch-badge { display: inline-flex; align-items: center; gap: 5px; padding: 3px 8px; border-radius: 6px; background: var(--ink); color: var(--bg); font: 600 .66rem var(--mono); letter-spacing: .09em; text-transform: uppercase; }
.lch-badge .ic { width: 13px; height: 13px; }
.lch-state { margin-left: auto; font-size: .8rem; font-weight: 700; color: var(--ink-3); display: inline-flex; align-items: center; gap: 4px; }
.lab-challenge.is-passed .lch-state { color: var(--a2-text); }
.lch-goal { margin: 6px 0 0; font-size: .92rem; max-width: none; }
.lch-goal p { margin: 0; }
.lch-result { margin-top: 10px; padding: 8px 12px; border-radius: 10px; background: var(--surface-2); font-size: .9rem; display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.lch-result.good { background: var(--green-soft); }
.lch-rank { color: var(--ink-2); }

/* ------------------------------------------------------------------ lesson discussion */
.discussion { margin: 36px 0 12px; padding: 18px 20px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); }
.disc-head { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px; align-items: start; margin-bottom: 12px; }
.disc-icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); }
.disc-head h2 { margin: 0 0 4px; font-size: 1.2rem; }
.disc-head p { margin: 0; font-size: .9rem; }
.disc-note { font-size: .78rem; margin: 6px 0 0; }
.disc-frame:not(:empty) { margin-top: 8px; }
@media print { .discussion { display: none !important; } }


/* home: today at a glance */