/* Practice exam — styles
   Visual language: Segoe UI, flat surfaces, 2px corners, one accent blue,
   hairline borders. No decorative effects. */

:root {
  --font: "Segoe UI", "Segoe UI Web (West European)", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: Consolas, "Cascadia Mono", "SF Mono", Menlo, "Courier New", monospace;

  --text: #201f1e;
  --text-2: #605e5c;
  --line: #c8c6c4;
  --line-soft: #e1dfdd;
  --line-strong: #8a8886;
  --surface: #ffffff;
  --surface-2: #faf9f8;
  --surface-3: #f3f2f1;
  --header: #242424;

  --brand: #0f6cbd;
  --brand-hover: #115ea3;
  --brand-tint: #ebf3fc;
  --brand-track: #c7e0f4;

  --ok: #0e700e;
  --ok-tint: #f1faf1;
  --bad: #a4262c;
  --bad-tint: #fdf3f4;
  --warn-tint: #fff4ce;
  --warn-line: #c19c00;

  --radius: 2px;
  --gutter: 24px;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  margin: 0;
  font: 15px/1.5 var(--font);
  color: var(--text);
  background: var(--surface-3);
  overflow-wrap: break-word;
}

body.is-exam { background: var(--surface); overflow: hidden; }
body.is-dragging { user-select: none; -webkit-user-select: none; cursor: grabbing; }

h1, h2, h3, h4, p, dl, dd, figure { margin: 0; }
button, input, select { font: inherit; color: inherit; }
a { color: var(--brand); }
a:hover { color: var(--brand-hover); }
img { max-width: 100%; height: auto; }

:focus-visible { outline: 2px solid var(--text); outline-offset: 2px; }
.exam-bar :focus-visible, .site-header :focus-visible { outline-color: #ffffff; }

.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 8px; top: -48px; z-index: 100;
  padding: 8px 12px; background: var(--surface); color: var(--text); border: 2px solid var(--text);
}
.skip-link:focus { top: 8px; }

.muted { color: var(--text-2); }
.icon { flex: none; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 36px; padding: 6px 16px;
  font: 600 14px/1.3 var(--font); text-decoration: none; white-space: nowrap;
  border: 1px solid transparent; border-radius: var(--radius); cursor: pointer;
}
.btn--primary { background: var(--brand); color: #ffffff; }
.btn--primary:hover { background: var(--brand-hover); color: #ffffff; }
.btn--secondary { background: var(--surface); color: var(--text); border-color: var(--line-strong); }
.btn--secondary:hover { background: var(--surface-3); color: var(--text); }
.btn--subtle { background: transparent; color: var(--brand); }
.btn--subtle:hover { background: var(--surface-3); color: var(--brand-hover); }
.btn--danger { background: var(--bad); color: #ffffff; }
.btn--danger:hover { background: #8e2026; }
.btn--large { min-height: 40px; padding: 8px 24px; font-size: 15px; }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--surface-3); color: #a19f9d; border-color: var(--line-soft); cursor: not-allowed;
}

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; padding: 0;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--line-strong); border-radius: var(--radius); cursor: pointer;
}
.icon-btn:hover { background: var(--surface-3); }
.icon-btn:disabled { color: #a19f9d; border-color: var(--line-soft); cursor: not-allowed; background: var(--surface-3); }
.icon-btn--plain { border-color: transparent; }

.link-btn {
  padding: 0; background: none; border: 0; color: var(--brand); text-align: left; cursor: pointer;
}
.link-btn:hover { text-decoration: underline; color: var(--brand-hover); }

.chip-btn {
  min-height: 32px; padding: 4px 12px; background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: var(--radius); cursor: pointer; font-size: 14px;
}
.chip-btn:hover { background: var(--surface-3); }
.chip-btn[aria-pressed="true"] { background: var(--brand-tint); border-color: var(--brand); font-weight: 600; }

/* ---------- Form controls ---------- */

.select {
  width: 100%; max-width: 100%; min-height: 36px; padding: 4px 8px;
  background: var(--surface); border: 1px solid var(--text-2); border-radius: var(--radius);
}
.select:disabled { background: var(--surface-3); color: var(--text); opacity: 1; }
.select--inline {
  width: auto; min-height: 30px; margin: 2px; padding: 2px 6px;
  font: 13px/1.3 var(--font); vertical-align: middle;
}
.select--compact { width: auto; min-height: 32px; }
.select.is-correct { border: 2px solid var(--ok); }
.select.is-wrong { border: 2px solid var(--bad); }
.select-wrap { display: inline-flex; align-items: center; flex-wrap: wrap; gap: 4px 6px; max-width: 100%; vertical-align: middle; }

input[type="radio"], input[type="checkbox"] {
  width: 18px; height: 18px; margin: 0; flex: none; accent-color: var(--brand);
}

/* ---------- Site pages ---------- */

.site { min-height: 100vh; display: flex; flex-direction: column; }
.site-header { background: var(--header); color: #ffffff; }
.site-header__inner {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  max-width: 1120px; min-height: 48px; margin: 0 auto; padding: 0 var(--gutter);
}
.brand { display: inline-flex; align-items: baseline; gap: 8px; color: #ffffff; text-decoration: none; font-size: 15px; }
.brand:hover { color: #ffffff; }
.brand strong { font-weight: 600; }
.brand span { color: #d2d0ce; }
.site-nav { display: flex; gap: 4px; align-self: stretch; }
.site-nav__link {
  display: inline-flex; align-items: center; padding: 0 12px; min-height: 48px;
  color: #d2d0ce; text-decoration: none; font-size: 14px; border-bottom: 2px solid transparent;
}
.site-nav__link:hover { color: #ffffff; }
.site-nav__link.is-active { color: #ffffff; border-bottom-color: #ffffff; font-weight: 600; }

.page { width: 100%; max-width: 1120px; margin: 0 auto; padding: 24px var(--gutter) 40px; flex: 1; }
.page:focus { outline: none; }
.page__head { margin-bottom: 20px; }
.page__kicker { font-size: 13px; color: var(--text-2); }
.page__title { font-size: 24px; line-height: 1.25; font-weight: 600; }

.site-footer {
  width: 100%; max-width: 1120px; margin: 0 auto; padding: 16px var(--gutter) 24px;
  border-top: 1px solid var(--line-soft); font-size: 12.5px; color: var(--text-2);
}

.columns { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(260px, 1fr); gap: 20px; align-items: start; }
.columns--even { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: 16px; }

.panel, .setup {
  background: var(--surface); border: 1px solid var(--line-soft); padding: 20px; margin-bottom: 20px;
}
.section-title { font-size: 17px; font-weight: 600; margin-bottom: 14px; }
.sub-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.panel > p { margin-bottom: 12px; }

.field { margin: 0 0 20px; padding: 0; border: 0; min-width: 0; }
.field__label { display: block; padding: 0; margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.field__help { margin-top: 6px; font-size: 13px; color: var(--text-2); }

.option-grid { display: grid; gap: 8px; }
.option-grid--two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.option-grid--five { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.option-card {
  display: flex; align-items: flex-start; gap: 10px; height: 100%; padding: 10px 12px;
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius); cursor: pointer;
}
.option-card:hover { background: var(--surface-2); }
.option-card:has(input:checked) { border-color: var(--brand); box-shadow: inset 0 0 0 1px var(--brand); background: var(--brand-tint); }
.option-card input { margin-top: 2px; }
.option-card__body { display: block; min-width: 0; }
.option-card__title { display: block; font-weight: 600; font-size: 14px; white-space: nowrap; }
.option-grid--two .option-card__title { white-space: normal; }
.option-card__text { display: block; font-size: 13px; color: var(--text-2); }

.check-row { display: flex; align-items: flex-start; gap: 10px; padding: 6px 0; cursor: pointer; }
.check-row input { margin-top: 2px; }
.check-row__title { display: block; font-size: 14px; }
.check-row__text { display: block; font-size: 13px; color: var(--text-2); }
.check-row.is-disabled { color: #a19f9d; cursor: default; }
.check-row.is-disabled .check-row__text { color: #a19f9d; }

.setup__actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; padding-top: 4px; }
.setup__outline { font-size: 14px; color: var(--text-2); }

.notice {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  margin-bottom: 20px; padding: 14px 16px;
  background: var(--brand-tint); border: 1px solid var(--brand); border-left-width: 4px;
}
.notice__title { font-size: 15px; font-weight: 600; }
.notice__actions { display: flex; gap: 8px; flex-wrap: wrap; }

.banner {
  display: flex; align-items: flex-start; gap: 8px; margin: 10px 0 14px; padding: 8px 12px; font-size: 14px;
  background: var(--surface-3); border: 1px solid var(--line);
}
.banner .icon { margin-top: 3px; }
.banner--warn { background: var(--warn-tint); border-color: var(--warn-line); }
.banner[hidden] { display: none; }

.stat-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 16px; margin-bottom: 14px; }
.stat-grid--wide { grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); }
.stat-grid dt { font-size: 13px; color: var(--text-2); }
.stat-grid dd { font-size: 22px; font-weight: 600; line-height: 1.3; }

.stat-row { display: flex; flex-wrap: wrap; gap: 8px 28px; margin: 12px 0 16px; }
.stat-row dt { font-size: 13px; color: var(--text-2); }
.stat-row dd { font-size: 20px; font-weight: 600; }

.kv > div { display: flex; justify-content: space-between; gap: 16px; padding: 6px 0; border-bottom: 1px solid var(--line-soft); font-size: 14px; }
.kv > div:last-child { border-bottom: 0; }
.kv dt { color: var(--text-2); }
.kv dd { font-weight: 600; font-variant-numeric: tabular-nums; }

.action-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 24px; }

.score {
  display: grid; grid-template-columns: minmax(220px, 300px) minmax(0, 1fr); gap: 24px; align-items: center;
  padding: 24px; background: var(--surface); border: 1px solid var(--line-soft);
}
.score__value { font-size: 56px; line-height: 1; font-weight: 600; }
.score__count { margin-top: 8px; font-size: 16px; }
.score__verdict { display: flex; align-items: center; gap: 6px; margin-top: 8px; font-weight: 600; }
.score__verdict--pass { color: var(--ok); }
.score__verdict--fail { color: var(--bad); }
.score .stat-grid { margin: 0; }
.score__footnote { margin-top: 10px; font-size: 13px; }

.meter { position: relative; height: 10px; min-width: 90px; background: var(--brand-track); border-radius: 0 4px 4px 0; }
.meter__fill { height: 100%; background: var(--brand); border-radius: 0 4px 4px 0; }
.meter__pass { position: absolute; top: -3px; bottom: -3px; width: 2px; margin-left: -1px; background: var(--text); }
.col-meter { width: 32%; min-width: 110px; vertical-align: middle !important; }

.status { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; font-weight: 600; margin-right: 10px; }
.status--correct, .status--complete { color: var(--ok); }
.status--incorrect { color: var(--bad); }
.status--unanswered, .status--none, .status--locked { color: var(--text-2); }
.status--partial { color: #8a5a00; }
.status--flag { color: var(--text); }

.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.empty { padding: 24px 0; color: var(--text-2); }

.disclosure { margin-top: 8px; }
.disclosure summary { cursor: pointer; padding: 8px 0; font-weight: 600; color: var(--brand); }
.disclosure[open] summary { margin-bottom: 8px; }

/* ---------- Chart ---------- */

.chart { position: relative; }
.chart__plot svg { display: block; max-width: 100%; }
.chart__grid { stroke: var(--line-soft); stroke-width: 1; }
.chart__pass { stroke: var(--text-2); stroke-width: 1; }
.chart__tick { font: 12px var(--font); fill: var(--text-2); font-variant-numeric: tabular-nums; }
.chart__label { font: 600 13px var(--font); fill: var(--text); }
.chart__line { fill: none; stroke: var(--brand); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart__dot { fill: var(--brand); stroke: var(--surface); stroke-width: 2; }
.chart__hit { fill: transparent; cursor: default; }
.chart__hit:focus-visible { outline: 2px solid var(--text); outline-offset: -6px; }
.chart-tip {
  position: absolute; z-index: 2; display: flex; flex-direction: column; padding: 6px 10px;
  background: var(--text); color: #ffffff; font-size: 12px; line-height: 1.4; white-space: nowrap;
  border-radius: var(--radius); pointer-events: none;
}
.chart-tip[hidden] { display: none; }

/* ---------- Tables ---------- */

/* position: relative keeps visually hidden children inside the scroll box. */
.table-wrap { position: relative; max-width: 100%; margin-bottom: 14px; overflow-x: auto; }
.data-table { border-collapse: collapse; font-size: 14px; }
.data-table th, .data-table td { padding: 6px 12px; text-align: left; vertical-align: top; border: 1px solid var(--line); }
.data-table thead th { background: var(--surface-3); font-weight: 600; white-space: nowrap; }
.data-table .is-num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.data-table--rows { width: 100%; }
.data-table--rows th, .data-table--rows td { border-width: 0 0 1px; border-color: var(--line-soft); }
.data-table--rows thead th { border-bottom-color: var(--line); }
.data-table .row-head { font-weight: 400; }
.col-num { width: 1%; white-space: nowrap; text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- Exam shell ---------- */

/* Pinned to the viewport so focus and scrollIntoView can never move the shell. */
.exam { position: fixed; inset: 0; display: flex; flex-direction: column; background: var(--surface); }

.exam-bar {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: 12px;
  min-height: 48px; padding: 0 16px; padding-left: max(16px, env(safe-area-inset-left)); padding-right: max(16px, env(safe-area-inset-right));
  background: var(--header); color: #ffffff; flex: none;
}
.exam-bar__title { display: flex; align-items: baseline; gap: 8px; min-width: 0; font-size: 15px; white-space: nowrap; }
.exam-bar__title strong { font-weight: 600; }
.exam-bar__title span { color: #d2d0ce; font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
.exam-bar__count { font-size: 15px; font-weight: 600; text-align: center; white-space: nowrap; font-variant-numeric: tabular-nums; }
.exam-bar__right { display: flex; align-items: center; justify-content: flex-end; gap: 12px; }

.timer { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; white-space: nowrap; }
.timer__label { color: #d2d0ce; font-size: 13px; }
.timer__value { font-weight: 600; font-variant-numeric: tabular-nums; min-width: 44px; }
.timer.is-low .timer__value { color: #ffd335; }

.bar-btn {
  display: inline-flex; align-items: center; gap: 6px; min-height: 32px; padding: 4px 10px;
  background: transparent; color: #ffffff; border: 1px solid #8a8886; border-radius: var(--radius);
  font-size: 14px; cursor: pointer;
}
.bar-btn:hover { background: #3b3a39; }
.bar-btn:disabled { color: #8a8886; border-color: #484644; cursor: not-allowed; background: transparent; }

.progress { height: 3px; background: var(--line-soft); flex: none; }
.progress__fill { height: 100%; background: var(--brand); }

.exam-tools {
  display: flex; align-items: center; justify-content: space-between; gap: 8px 16px; flex-wrap: wrap;
  min-height: 40px; padding: 4px 16px; background: var(--surface-2); border-bottom: 1px solid var(--line-soft);
  font-size: 14px; flex: none;
}
.exam-tools__left { display: flex; align-items: center; gap: 8px; color: var(--text-2); min-width: 0; }
.inline-label { font-weight: 600; color: var(--text); }
.flag-toggle { display: inline-flex; align-items: center; gap: 6px; min-height: 32px; cursor: pointer; font-weight: 600; }

.exam-main { position: relative; flex: 1; min-height: 0; overflow: auto; display: flex; flex-direction: column; -webkit-overflow-scrolling: touch; }
.exam-main:focus { outline: none; }

.exam-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 8px 12px; flex-wrap: wrap;
  padding: 10px 16px; padding-bottom: max(10px, env(safe-area-inset-bottom));
  background: var(--surface-3); border-top: 1px solid var(--line); flex: none;
}
.exam-foot__group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ---------- Question layout ---------- */

.layout--single { width: 100%; max-width: 1000px; margin: 0 auto; padding: 20px var(--gutter) 40px; }

.layout--case {
  flex: 1; min-height: 0; display: grid;
  grid-template-columns: var(--case-width, 42%) 9px minmax(0, 1fr); grid-template-rows: minmax(0, 1fr);
}
.layout__pane { position: relative; min-width: 0; min-height: 0; overflow: auto; }
.layout__pane--case { background: var(--surface-2); display: flex; flex-direction: column; }
.layout__pane--question { padding: 20px var(--gutter) 40px; }

.pane-switch { display: none; }

.splitter {
  position: relative; background: var(--line-soft); border: solid var(--line); border-width: 0 1px;
  cursor: col-resize; touch-action: none;
}
.splitter::after {
  content: ""; position: absolute; left: 2px; top: 50%; width: 3px; height: 28px; margin-top: -14px;
  border: dotted var(--text-2); border-width: 0 3px 0 0;
}
.splitter:hover, .splitter:focus-visible { background: var(--brand-track); }

.case { display: flex; flex-direction: column; flex: 1; min-height: 0; }
.case__head { padding: 16px 20px 10px; }
.case__kicker { font-size: 12px; font-weight: 600; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-2); }
.case__title { font-size: 16px; line-height: 1.35; font-weight: 600; }
.tabs { display: flex; flex: none; padding: 0 12px; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab {
  padding: 8px 10px; background: none; border: 0; border-bottom: 2px solid transparent;
  font-size: 14px; color: var(--text-2); white-space: nowrap; cursor: pointer;
}
.tab:hover { color: var(--text); }
.tab.is-active { color: var(--text); font-weight: 600; border-bottom-color: var(--brand); }
.case__panel { flex: 1; min-height: 0; overflow: auto; padding: 16px 20px 24px; }

.question { min-width: 0; }
.question__head { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 10px; margin-bottom: 12px; }
.question__title { font-size: 18px; line-height: 1.3; font-weight: 600; }
.question__title:focus { outline: none; }
.question__type {
  padding: 1px 6px; font-size: 12px; font-weight: 600; letter-spacing: 0.03em; text-transform: uppercase;
  color: var(--text-2); border: 1px solid var(--line); border-radius: var(--radius);
}

.prose p { margin-bottom: 10px; }
.prose__heading { margin: 16px 0 6px; font-size: 14px; font-weight: 600; }
.prose__heading:first-child { margin-top: 0; }
.prose > :last-child { margin-bottom: 0; }
code {
  font-family: var(--mono); font-size: 0.93em; padding: 1px 4px;
  background: var(--surface-3); border-radius: var(--radius); overflow-wrap: anywhere;
}
.req-list { margin: 0 0 10px; padding-left: 22px; }
.req-list li { margin-bottom: 4px; }
.plain-list { margin: 0; padding-left: 20px; }
.plain-list li { margin-bottom: 2px; }
.answer-lines { margin: 0; padding: 0; list-style: none; }
.answer-lines li { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 6px; }
.answer-lines li:last-child { margin-bottom: 0; }
.answer-lines li > span:last-child { min-width: 0; padding-top: 2px; }

.exhibit { margin-bottom: 12px; }
.exhibit__label { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.exhibit__note { margin-top: 4px; font-size: 13px; color: var(--text-2); }
.exhibit--image img { display: block; border: 1px solid var(--line); }

.code {
  margin: 0 0 12px; padding: 10px 12px; max-width: 100%; overflow-x: auto;
  font: 13px/1.5 var(--mono); white-space: pre; tab-size: 2;
  background: var(--surface-2); border: 1px solid var(--line-soft); border-left: 3px solid var(--line-strong);
}
.exhibit .code { margin-bottom: 0; }
.code code { padding: 0; background: none; font-size: inherit; overflow-wrap: normal; }
.code--template { white-space: pre-wrap; overflow-wrap: anywhere; line-height: 2.3; margin-bottom: 0; }

.prose .data-table { background: var(--surface); }

/* ---------- Choices ---------- */

.choices { margin: 16px 0 0; padding: 0; border: 0; min-width: 0; }
.choices__legend { padding: 0; margin-bottom: 8px; font-size: 14px; font-weight: 600; color: var(--text-2); }
.choice {
  position: relative;
  display: grid; grid-template-columns: auto auto minmax(0, 1fr) auto; align-items: start; gap: 4px 10px;
  margin-bottom: 8px; padding: 10px 12px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); cursor: pointer;
}
.choice:hover { background: var(--surface-2); }
.choice input { margin-top: 2px; }
.choice__key { font-weight: 600; }
.choice__body { min-width: 0; }
.choice__body .code { margin: 0; }
.choice.is-selected { border-color: var(--brand); background: var(--brand-tint); box-shadow: inset 3px 0 0 var(--brand); }
.choice:has(input:disabled) { cursor: default; }

/* Revealed state: the correct option is green, a wrong pick is red, the rest recede. */
.choice.is-revealed { cursor: default; }
.choice.is-revealed input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.choice.is-correct, .choice.is-wrong { padding: 9px 11px; border-width: 2px; }
.choice.is-correct, .choice.is-correct:hover { border-color: var(--ok); background: var(--ok-tint); }
.choice.is-wrong, .choice.is-wrong:hover { border-color: var(--bad); background: var(--bad-tint); }
.choice.is-dim, .choice.is-dim:hover { background: var(--surface-2); color: var(--text-2); }
.choice__state {
  display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px;
  color: #ffffff; border-radius: 50%;
}
.choice__state--ok { background: var(--ok); }
.choice__state--bad { background: var(--bad); }
.choice__state--none { background: var(--surface); border: 1px solid var(--line); }

.badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 2px 8px; align-self: start;
  font: 600 13px/1.5 var(--font); color: #ffffff; white-space: nowrap; border-radius: var(--radius);
}
.badge--ok { background: var(--ok); }
.badge--bad { background: var(--bad); }
.fix-chip {
  display: inline-flex; align-items: center; gap: 5px; padding: 1px 8px;
  font: 600 13px/1.5 var(--font); color: var(--ok); white-space: normal;
  background: var(--ok-tint); border: 1px solid var(--ok); border-radius: var(--radius);
}
.key-chip {
  display: inline-flex; align-items: center; justify-content: center; flex: none; min-width: 26px; height: 26px; padding: 0 7px;
  font: 700 14px/1 var(--font); color: #ffffff; border-radius: var(--radius);
}
.key-chip--ok { background: var(--ok); }
.key-chip--bad { background: var(--bad); }

/* Verdict strip above the options */
.answer-block { scroll-margin: 12px; }
.result {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px 24px; margin-top: 16px; padding: 10px 14px;
  border: 1px solid var(--text-2); border-left-width: 6px; background: var(--surface-3);
}
.result:focus { outline: none; }
.result + .choices, .result + .answer-area { margin-top: 10px; }
.result--correct { border-color: var(--ok); background: var(--ok-tint); }
.result--incorrect { border-color: var(--bad); background: var(--bad-tint); }
.result__status { display: inline-flex; align-items: center; gap: 8px; font-size: 17px; }
.result__icon {
  display: inline-flex; align-items: center; justify-content: center; width: 26px; height: 26px; flex: none;
  color: #ffffff; background: var(--text-2); border-radius: 50%;
}
.result--correct .result__icon { background: var(--ok); }
.result--incorrect .result__icon { background: var(--bad); }
.result--correct .result__title { color: var(--ok); }
.result--incorrect .result__title { color: var(--bad); }
.result__pair { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
.result__label { font-weight: 600; }
.result__hint { font-size: 14px; flex: 1 1 280px; }
.result .tag { margin-left: auto; }

.widget-message { margin-top: 8px; padding: 8px 12px; font-size: 14px; background: var(--warn-tint); border: 1px solid var(--warn-line); }
.widget-message[hidden] { display: none; }
.widget-hint { margin-top: 10px; font-size: 13px; color: var(--text-2); }

.mark { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; font-weight: 600; }
.mark--ok { color: var(--ok); }
.mark--bad { color: var(--bad); }
.mark--icon { flex: none; }
.tag {
  display: inline-flex; align-items: center; gap: 4px; padding: 0 6px; font-size: 12px; font-weight: 600;
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius);
}

/* ---------- Answer area (hotspot, drag and drop) ---------- */

.answer-area { margin-top: 16px; padding: 14px 16px 16px; background: var(--surface); border: 1px solid var(--line); border-top: 2px solid var(--text); }
.answer-area__title, .order__title { font-size: 15px; font-weight: 600; margin-bottom: 10px; }

.yn__head, .yn__row { display: grid; grid-template-columns: minmax(0, 1fr) 60px 60px; column-gap: 8px; align-items: start; }
.yn__head { padding-bottom: 6px; font-weight: 600; font-size: 14px; }
.yn__head span:not(:first-child) { text-align: center; }
.yn__row { padding: 10px 0; border-top: 1px solid var(--line-soft); }
.yn__stmt { min-width: 0; }
.yn__stmt p { margin-bottom: 6px; }
.yn__stmt .code { margin-bottom: 0; }
.yn__cell { display: flex; align-items: center; justify-content: center; gap: 4px; min-height: 40px; cursor: pointer; border: 1px solid var(--line-soft); border-radius: var(--radius); }
.yn__cell.is-key, .yn__cell.is-key:hover { border: 2px solid var(--ok); background: var(--ok-tint); color: var(--ok); cursor: default; }
.yn__cell.is-miss, .yn__cell.is-miss:hover { border: 2px solid var(--bad); background: var(--bad-tint); color: var(--bad); cursor: default; }
.yn__cell:hover { background: var(--surface-3); }
.yn__cell-text { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); }
.yn__result { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px; margin: 6px 0 0 !important; font-size: 13px; }

.dd__row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(200px, 340px); gap: 6px 16px; align-items: center; padding: 8px 0; }
.dd__label { text-align: right; }
.dd__row .select-wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 4px 8px; }
.dd__row .select-wrap .fix-chip { grid-column: 1 / -1; justify-self: start; }

.order { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto; gap: 12px; align-items: start; }
.order__col { min-width: 0; }
.order__moves { display: flex; flex-direction: column; gap: 8px; padding-top: 34px; }

.dnd-list {
  display: flex; flex-direction: column; gap: 6px; min-height: 132px; margin: 0; padding: 8px; list-style: none;
  background: var(--surface-2); border: 1px solid var(--line);
}
.dnd-list.is-over { background: var(--brand-tint); outline: 2px solid var(--brand); outline-offset: -2px; }
.dnd-list__row { display: block; }
.dnd-empty { padding: 6px 4px; font-size: 13px; color: var(--text-2); }
.dnd-marker { height: 3px; margin: -2px 0; background: var(--brand); list-style: none; }

.dnd-item {
  display: flex; align-items: center; gap: 8px; width: 100%; min-height: 40px; padding: 6px 10px 6px 4px;
  text-align: left; background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius);
  cursor: grab; user-select: none; -webkit-user-select: none;
}
.dnd-item:hover { border-color: var(--text); }
.dnd-item.is-selected { border-color: var(--brand); background: var(--brand-tint); box-shadow: inset 0 0 0 1px var(--brand); }
.dnd-item.is-drag-source { opacity: 0.4; }
.dnd-item:disabled { color: var(--text); cursor: default; opacity: 1; }
.dnd-item.is-correct { border-color: var(--ok); background: var(--ok-tint); }
.dnd-item.is-wrong { border-color: var(--bad); background: var(--bad-tint); }
.dnd-item__grip { display: inline-flex; padding: 6px 2px; color: var(--text-2); touch-action: none; }
.dnd-item__pos {
  flex: none; display: inline-flex; align-items: center; justify-content: center; width: 22px; height: 22px;
  font-size: 12px; font-weight: 600; background: var(--surface-3); border: 1px solid var(--line); border-radius: var(--radius);
}
.dnd-item__text { flex: 1; min-width: 0; }
.dnd-ghost {
  position: fixed; left: 0; top: 0; z-index: 1000; margin: 0; pointer-events: none;
  opacity: 0.95; box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
}

.match { display: grid; grid-template-columns: minmax(170px, 240px) minmax(0, 1fr); gap: 20px; align-items: start; }
.match__col { min-width: 0; }
.dnd-list--bank { min-height: 0; }
.match__targets { display: flex; flex-direction: column; gap: 10px; }
.match__row { display: grid; grid-template-columns: minmax(0, auto) minmax(150px, 260px); gap: 10px; align-items: center; justify-content: start; }

.slot {
  display: inline-flex; align-items: stretch; min-width: 150px; max-width: 100%; min-height: 36px; vertical-align: middle;
  background: var(--surface); border: 1px solid var(--text-2); border-radius: var(--radius);
}
.slot__target { flex: 1; min-width: 0; padding: 4px 10px; text-align: left; background: none; border: 0; cursor: pointer; }
.slot__target:disabled { color: var(--text); cursor: default; }
.slot.is-filled .slot__target { font-weight: 600; cursor: grab; touch-action: none; }
.slot.is-filled .slot__target:disabled { cursor: default; }
.slot__clear {
  display: inline-flex; align-items: center; justify-content: center; width: 32px; padding: 0;
  background: var(--surface-3); border: 0; border-left: 1px solid var(--line); cursor: pointer;
}
.slot__clear:hover { background: var(--line-soft); }
.slot.is-over { background: var(--brand-tint); outline: 2px solid var(--brand); outline-offset: 1px; }
.has-selection .slot:not(.is-filled) { border-color: var(--brand); border-style: dashed; background: var(--brand-tint); }
.slot.is-correct { border: 2px solid var(--ok); }
.slot.is-wrong { border: 2px solid var(--bad); }
.slot .mark { align-self: center; padding: 0 6px; }
.slot-group { display: inline-flex; align-items: center; flex-wrap: wrap; gap: 4px 6px; max-width: 100%; vertical-align: middle; }
.slot--inline { min-width: 120px; min-height: 30px; margin: 2px 4px; font: 13px/1.3 var(--font); white-space: normal; }

/* ---------- Explanation panel ---------- */

.fb { margin-top: 20px; background: var(--surface); border: 1px solid var(--line); }
.fb__answers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding: 14px 16px; border-bottom: 1px solid var(--line-soft); }
.answer-card { min-width: 0; padding: 10px 12px; background: var(--surface-2); border: 1px solid var(--line); border-left: 4px solid var(--text-2); }
.answer-card--wide { grid-column: 1 / -1; }
.answer-card--ok { background: var(--ok-tint); border-color: var(--ok); }
.answer-card--bad { background: var(--bad-tint); border-color: var(--bad); }
.answer-card__title { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.answer-card--ok .answer-card__title { color: var(--ok); }
.answer-card--bad .answer-card__title { color: var(--bad); }
.fb__section { padding: 14px 16px 0; }
.fb__section p { margin-bottom: 8px; }
.fb__heading { display: flex; align-items: center; gap: 6px; margin-bottom: 6px; font-size: 14px; font-weight: 600; }
.fb__heading--ok { color: var(--ok); font-size: 15px; }
.fb__heading--bad { color: var(--bad); font-size: 15px; }
.reasons dt { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-bottom: 4px; font-weight: 600; }
.reasons dd { margin: 0 0 12px; }
.reasons dd:last-child { margin-bottom: 4px; }
.fb__takeaway { margin: 14px 16px 0; padding: 10px 12px; background: var(--surface-3); border-left: 3px solid var(--brand); }
.fb__takeaway p { margin: 0; }
.fb__meta { display: flex; flex-wrap: wrap; gap: 6px 24px; margin-top: 14px; padding: 10px 16px; font-size: 13px; background: var(--surface-2); border-top: 1px solid var(--line-soft); }
.fb__meta dt { color: var(--text-2); }
.fb__meta dd { font-weight: 600; }

.review-screen, .intro { min-width: 0; }
.review-screen > p, .intro > p { margin: 8px 0 12px; }
.intro { max-width: 760px; }
.intro__exam { color: var(--text-2); }
.intro .req-list li { margin-bottom: 10px; }

/* ---------- Navigator drawer ---------- */

dialog.drawer {
  margin: 0 0 0 auto; padding: 0; width: min(380px, 100vw); max-width: 100vw; height: 100vh; height: 100dvh; max-height: none;
  background: var(--surface); color: var(--text); border: 0; border-left: 1px solid var(--line);
}
dialog.drawer[open] { display: flex; flex-direction: column; }
dialog::backdrop { background: rgba(0, 0, 0, 0.4); }
.drawer__head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 12px 10px 16px; border-bottom: 1px solid var(--line-soft); flex: none; }
.drawer__title { font-size: 16px; font-weight: 600; }
.drawer__body { flex: 1; min-height: 0; overflow: auto; padding: 14px 16px; }
.drawer__summary { margin-bottom: 12px; font-size: 13px; color: var(--text-2); }
.drawer__foot { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 16px; padding-bottom: max(12px, env(safe-area-inset-bottom)); border-top: 1px solid var(--line); background: var(--surface-3); flex: none; }

.nav-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 10px; }
.nav-cell {
  position: relative; display: flex; align-items: center; justify-content: center; width: 100%; height: 44px; padding: 0;
  font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums;
  background: var(--surface); color: var(--text); border: 1px solid var(--text-2); border-radius: var(--radius); cursor: pointer;
}
.nav-cell:hover { background: var(--surface-3); }
.nav-cell.is-complete { background: var(--brand); color: #ffffff; border-color: var(--brand); }
.nav-cell.is-complete:hover { background: var(--brand-hover); }
.nav-cell.is-partial { border: 2px dashed var(--brand); }
.nav-cell.is-current { outline: 3px solid var(--text); outline-offset: 2px; }
.nav-cell.is-locked, .nav-cell:disabled { background: var(--surface-3); color: var(--text-2); border-color: var(--line); cursor: not-allowed; }
.nav-cell.is-result-correct { background: var(--ok-tint); border-color: var(--ok); }
.nav-cell.is-result-incorrect { background: var(--bad-tint); border-color: var(--bad); }
.nav-cell__icon {
  position: absolute; width: 16px; height: 16px; padding: 1px;
  background: var(--surface); color: var(--text); border: 1px solid var(--text-2); border-radius: var(--radius);
}
.nav-cell__icon--flag { top: -6px; right: -6px; }
.nav-cell__icon--lock { top: -6px; left: -6px; }
.nav-cell__icon--check { bottom: -6px; right: -6px; color: var(--ok); border-color: var(--ok); }
.nav-cell__icon--close { bottom: -6px; right: -6px; color: var(--bad); border-color: var(--bad); }
.nav-cell__icon--dash { bottom: -6px; right: -6px; }
.nav-cell--sample { width: 28px; height: 28px; flex: none; font-size: 12px; cursor: default; pointer-events: none; }
.nav-cell--sample.is-current { outline-width: 2px; }

.legend { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 12px; margin: 20px 0 0; padding: 14px 0 0; list-style: none; border-top: 1px solid var(--line-soft); font-size: 13px; }
.legend li { display: flex; align-items: center; gap: 10px; min-width: 0; }

/* ---------- Modal ---------- */

dialog.dialog {
  width: min(480px, calc(100vw - 32px)); padding: 0;
  background: var(--surface); color: var(--text); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.22);
}
.dialog__title { padding: 20px 24px 0; font-size: 18px; font-weight: 600; }
.dialog__body { padding: 10px 24px 4px; }
.dialog__body p { margin-bottom: 10px; }
.dialog__actions { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 8px; padding: 12px 24px 20px; }

/* ---------- Responsive ---------- */

@media (max-width: 899px) {
  :root { --gutter: 16px; }

  .columns, .columns--even { grid-template-columns: minmax(0, 1fr); }
  .score { grid-template-columns: minmax(0, 1fr); }

  .layout--case { display: block; flex: none; }
  .layout__pane { overflow: visible; }
  .layout__pane--case { display: block; }
  .case { display: block; }
  .case__panel { overflow: visible; }
  .splitter { display: none; }
  .pane-switch {
    display: flex; position: sticky; top: 0; z-index: 5;
    background: var(--surface); border-bottom: 1px solid var(--line);
  }
  .pane-switch__btn {
    flex: 1; min-height: 44px; padding: 8px; background: none; border: 0; border-bottom: 3px solid transparent;
    font-size: 14px; color: var(--text-2); cursor: pointer;
  }
  .pane-switch__btn[aria-pressed="true"] { color: var(--text); font-weight: 600; border-bottom-color: var(--brand); }
  .layout--case[data-pane="scenario"] .layout__pane--question { display: none; }
  .layout--case[data-pane="question"] .layout__pane--case { display: none; }
}

@media (max-width: 719px) {
  .order { grid-template-columns: minmax(0, 1fr); }
  .order__moves { flex-direction: row; padding-top: 0; }
  .order .dnd-list { min-height: 72px; }
  .match { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .dnd-list--bank { flex-direction: row; flex-wrap: wrap; }
  .dnd-list--bank .dnd-list__row { flex: 1 1 140px; }
  .dd__row { grid-template-columns: minmax(0, 1fr); }
  .dd__label { text-align: left; font-weight: 600; }
  .fb__answers { grid-template-columns: minmax(0, 1fr); }
  .option-grid--two { grid-template-columns: minmax(0, 1fr); }
  .option-grid--five { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .match__row { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .match__row .slot { width: 100%; }
  .legend { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 599px) {
  body { font-size: 15px; }
  .page__title { font-size: 20px; }
  .score__value { font-size: 44px; }
  .panel, .setup, .score { padding: 16px; }

  .exam-bar { grid-template-columns: auto minmax(0, 1fr) auto; gap: 8px; padding: 0 12px; }
  .exam-bar__title span, .timer__label, .bar-btn__text { display: none; }
  .exam-bar__count { font-size: 14px; }
  .exam-tools { padding: 4px 12px; }
  .exam-foot { padding-left: 12px; padding-right: 12px; }
  .exam-foot__review { display: none; }
  .exam-foot .btn { min-height: 44px; }

  .yn__head, .yn__row { grid-template-columns: minmax(0, 1fr) 48px 48px; column-gap: 6px; }
  .answer-area { padding: 12px; }
  .choice { padding: 10px; gap: 4px 8px; }
  .choice.is-correct, .choice.is-wrong { padding: 9px; }
  .choice .badge { grid-column: 3 / -1; justify-self: start; }
  .result { gap: 8px 16px; }
  .result .tag { margin-left: 0; }
  .code { font-size: 12.5px; }
  .dialog__actions { flex-direction: column-reverse; }
  .dialog__actions .btn { width: 100%; min-height: 44px; }
  .action-row .btn { flex: 1 1 100%; min-height: 44px; }
  .col-meter { display: none; }
}

@media (pointer: coarse) {
  .btn, .chip-btn, .select { min-height: 44px; }
  .icon-btn { width: 44px; height: 44px; }
  .select--inline { min-height: 40px; }
  .slot { min-height: 44px; }
  .slot--inline { min-height: 40px; }
  .dnd-item { min-height: 48px; }
  .dnd-item__grip { padding: 12px 8px; }
  .tab { min-height: 44px; }
  .choice { padding-top: 12px; padding-bottom: 12px; }
  .yn__cell { min-height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}

@media print {
  .exam-bar, .exam-foot, .exam-tools, .site-header, .site-footer, .action-row { display: none; }
  body.is-exam { overflow: visible; }
  .exam { height: auto; }
  .exam-main { overflow: visible; }
}