/* KKD CRQ spreadsheet practice — Ledger and Lantern theme (ink #17233A, saffron #D97B1B, paper). */
:root {
  --kkd-ink: #17233A;
  --kkd-ink-soft: #24344f;
  --kkd-saffron: #D97B1B;
  --kkd-saffron-deep: #b25f0e;
  --kkd-paper: #faf6ee;
  --kkd-paper-deep: #f1e9d8;
  --kkd-line: #e2d7c2;
  --kkd-ok: #2e7d4f;
  --kkd-bad: #b3402e;
}
/* Dark mode: same palette language as the main portal theme. */
[data-theme="dark"] {
  --kkd-ink: #EAE3D0;
  --kkd-ink-soft: #9AA6BE;
  --kkd-saffron: #E89B3D;
  --kkd-saffron-deep: #F0A952;
  --kkd-paper: #0D1526;
  --kkd-paper-deep: #16223C;
  --kkd-line: #2D3B59;
  --kkd-ok: #6FCF97;
  --kkd-bad: #E57373;
}
[data-theme="dark"] .crq-topbar { background: #0B1220; }
[data-theme="dark"] .crq-tabs { background: transparent; }
[data-theme="dark"] .crq-tab { background: #16223C; }
[data-theme="dark"] .crq-tab.is-active { background: #1A2540; border-bottom: 2px solid #1A2540; }
[data-theme="dark"] .crq-panel { background: #1A2540; }
[data-theme="dark"] .crq-grid-scroll { background: #0F1A30; }
[data-theme="dark"] .crq-grid th { background: #16223C; }
[data-theme="dark"] .crq-grid td { border-color: #2D3B59; background: #0F1A30; }
[data-theme="dark"] .crq-cell { color: #EAE3D0; }
[data-theme="dark"] .crq-cell.is-active { background: #2A2417; }
[data-theme="dark"] .crq-cell.in-sel { background: rgba(232, 155, 61, 0.22); }
[data-theme="dark"] .crq-cell.is-active.in-sel { background: #2A2417; }
[data-theme="dark"] .crq-formula-input,
[data-theme="dark"] .crq-fig-input-wrap input { background: #0F1A30; color: #EAE3D0; }
[data-theme="dark"] .crq-fig-input-wrap input.is-right { background: #14301f; }
[data-theme="dark"] .crq-fig-input-wrap input.is-wrong { background: #3a1c1a; }
[data-theme="dark"] .crq-ctx-menu { background: #16223C; border-color: #2D3B59; }
[data-theme="dark"] .crq-ctx-menu button { color: #EAE3D0; }
[data-theme="dark"] .crq-ctx-menu button:hover { background: #1A2540; }
[data-theme="dark"] .crq-data-table thead th { background: #0B1220; }
[data-theme="dark"] .crq-data-table tbody tr:nth-child(even) { background: #16223C; }
[data-theme="dark"] .crq-score-strip { background: #0B1220; }
[data-theme="dark"] .crq-active-ref { background: #0B1220; }
[data-theme="dark"] .crq-req-marks { background: #0B1220; }
[data-theme="dark"] .crq-format-bar { background: #16223C; }
[data-theme="dark"] .crq-format-bar button:hover,
[data-theme="dark"] .crq-color-btn:hover { background: #1A2540; }
[data-theme="dark"] .crq-format-bar button.is-on { background: #EAE3D0; color: #0D1526; }
[data-theme="dark"] .crq-sheet-hint kbd { background: #16223C; }
[data-theme="dark"] .crq-tutor-note { background: #2A2417; }
[data-theme="dark"] .crq-point:hover { background: #16223C; }
[data-theme="dark"] .crq-graph { background: #16223C; }
[data-theme="dark"] code { background: #0F1A30; }
/* Clickable logo -> homepage */
.crq-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex: none;
  background: var(--kkd-saffron);
  color: #fff;
  font-weight: 800;
  font-size: 22px;
  text-decoration: none;
  border-radius: 8px;
}
.crq-logo:hover { background: var(--kkd-saffron-deep); }
.crq-q-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 18px; }
.crq-q-actions .crq-cta { margin-top: 0; }
/* Theme toggle in the top bar */
.crq-theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  flex: none;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 8px;
  color: #fff;
  cursor: pointer;
}
.crq-theme-btn:hover { border-color: var(--kkd-saffron); color: var(--kkd-saffron); }
.crq-theme-btn .material-icons { font-size: 20px; }
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--kkd-paper);
  color: var(--kkd-ink);
  font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif; }
code {
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  background: var(--kkd-paper-deep);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ── Top bar ── */
.crq-topbar {
  background: var(--kkd-ink);
  color: #fff;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.crq-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #fff;
  background: none;
  border: 0;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  opacity: 0.9;
  cursor: pointer;
  padding: 0;
}
.crq-back:hover { opacity: 1; color: var(--kkd-saffron); }
.crq-title-wrap { flex: 1; min-width: 0; }
.crq-title-wrap h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.crq-subtitle { margin: 2px 0 0; font-size: 0.85rem; opacity: 0.75; }
.crq-marks-chip {
  background: var(--kkd-saffron);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 6px 12px;
  border-radius: 999px;
  white-space: nowrap;
}

/* ── Tabs ── */
.crq-tabs {
  display: flex;
  gap: 6px;
  padding: 12px 18px 0;
}
.crq-tab {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 8px;
  border: 2px solid var(--kkd-line);
  border-bottom: none;
  border-radius: 10px 10px 0 0;
  background: var(--kkd-paper-deep);
  color: var(--kkd-ink-soft);
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
}
.crq-tab .material-icons { font-size: 1.15rem; }
.crq-tab.is-active {
  background: #fff;
  color: var(--kkd-ink);
  border-color: var(--kkd-saffron);
  border-bottom: 2px solid #fff;
  margin-bottom: -2px;
}

/* ── Panels ── */
.crq-main { padding: 0 18px 60px; }
.crq-panel {
  display: none;
  background: #fff;
  border: 2px solid var(--kkd-saffron);
  border-radius: 0 0 12px 12px;
  padding: 26px;
}
.crq-panel.is-active { display: block; }

/* ── Question tab ── */
.crq-scenario h4 {
  color: var(--kkd-saffron-deep);
  margin: 1.4em 0 0.5em;
  font-size: 1.05rem;
}
.crq-scenario p { line-height: 1.65; }
.crq-data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 0.92rem;
}
.crq-data-table th, .crq-data-table td {
  border: 1px solid var(--kkd-line);
  padding: 8px 10px;
  text-align: right;
}
.crq-data-table th:first-child, .crq-data-table td:first-child { text-align: left; }
.crq-data-table thead th { background: var(--kkd-ink); color: #fff; }
.crq-data-table tbody tr:nth-child(even) { background: var(--kkd-paper); }
.crq-requirements { margin-top: 26px; }
.crq-requirements h3 { margin: 0 0 12px; }
.crq-graph {
  margin: 18px auto;
  max-width: 760px;
  border: 1px solid var(--kkd-line);
  background: #fff;
  padding: 10px;
}
.crq-req {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--kkd-paper);
  border-left: 4px solid var(--kkd-saffron);
  padding: 12px 14px;
  margin-bottom: 10px;
}
.crq-req p { margin: 0; flex: 1; line-height: 1.55; }
.crq-req-ref {
  font-weight: 700;
  color: var(--kkd-saffron-deep);
  white-space: nowrap;
}
.crq-req-marks {
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--kkd-ink);
  color: #fff;
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}
.crq-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  background: var(--kkd-saffron);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 13px 22px;
  font: inherit;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
}
.crq-cta:hover { background: var(--kkd-saffron-deep); }

/* ── Spreadsheet tab ── */
.crq-sheet-hint { margin: 0 0 14px; line-height: 1.6; color: var(--kkd-ink-soft); }
.crq-formula-bar {
  display: flex;
  gap: 8px;
  align-items: stretch;
  margin-bottom: 10px;
}
.crq-active-ref {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  background: var(--kkd-ink);
  color: #fff;
  font-weight: 700;
  border-radius: 6px;
  font-size: 0.95rem;
}
.crq-formula-input {
  flex: 1;
  font: inherit;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  padding: 10px 12px;
  border: 2px solid var(--kkd-line);
  border-radius: 6px;
  font-size: 16px;
}
.crq-formula-input:focus { outline: none; border-color: var(--kkd-saffron); }
.crq-grid-scroll {
  overflow: auto;
  max-height: 62vh;
  border: 2px solid var(--kkd-line);
  border-radius: 8px;
  background: #fff;
  position: relative;
}
/* Fill handle: the small square at the active cell's corner, drag it to fill (Excel-like). */
.crq-fill-handle {
  position: absolute;
  width: 11px;
  height: 11px;
  background: var(--kkd-saffron);
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--kkd-ink);
  cursor: crosshair;
  z-index: 8;
  touch-action: none;
  visibility: hidden;
}
/* While rubber-banding a selection with the mouse. */
.crq-no-select, .crq-no-select * { user-select: none !important; -webkit-user-select: none !important; }
/* Right-click context menu. */
.crq-ctx-menu {
  position: fixed;
  z-index: 60;
  min-width: 170px;
  background: #fffdf6;
  border: 1px solid var(--kkd-ink);
  box-shadow: 4px 4px 0 rgba(23, 35, 58, .18);
  padding: 4px;
}
.crq-ctx-menu button {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  padding: 8px 12px;
  font: inherit;
  font-size: .85rem;
  color: var(--kkd-ink);
  cursor: pointer;
}
.crq-ctx-menu button:hover { background: var(--kkd-paper); }
.crq-ctx-sep { display: block; height: 1px; background: var(--kkd-line); margin: 4px 6px; }
.crq-grid { border-collapse: collapse; width: 100%; table-layout: fixed; }
.crq-grid th {
  background: var(--kkd-paper-deep);
  color: var(--kkd-ink-soft);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 4px;
  border: 1px solid var(--kkd-line);
  position: sticky;
  top: 0;
  z-index: 2;
  min-width: 34px;
}
.crq-grid thead th:first-child { z-index: 3; left: 0; }
.crq-grid tbody th {
  position: sticky;
  left: 0;
  z-index: 1;
  min-width: 40px;
}
.crq-grid td { border: 1px solid #e9e2d2; padding: 0; min-width: 96px; }
.crq-cell {
  min-height: 30px;
  padding: 5px 8px;
  font-size: 0.9rem;
  outline: none;
  white-space: nowrap;
  overflow: hidden;
  cursor: cell;
}
.crq-cell.is-active { box-shadow: inset 0 0 0 2px var(--kkd-saffron); background: #fff8ec; }
.crq-cell.is-err { color: var(--kkd-bad); font-weight: 700; }
.crq-sheet-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.crq-sheet-actions .crq-cta { margin-top: 0; }
.crq-ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 2px solid var(--kkd-line);
  border-radius: 8px;
  padding: 10px 16px;
  font: inherit;
  font-weight: 600;
  color: var(--kkd-ink-soft);
  cursor: pointer;
}
.crq-ghost-btn:hover { border-color: var(--kkd-bad); color: var(--kkd-bad); }

/* ── Check tab ── */
.crq-score-strip {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--kkd-ink);
  color: #fff;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.crq-score-strip .material-icons { color: var(--kkd-saffron); }
.crq-score-strip strong { color: var(--kkd-saffron); font-size: 1.3rem; }
.crq-check-intro { color: var(--kkd-ink-soft); line-height: 1.6; }
.crq-check-part {
  border: 2px solid var(--kkd-line);
  border-radius: 10px;
  padding: 18px;
  margin: 18px 0;
}
.crq-check-part > header { display: flex; gap: 12px; align-items: flex-start; margin-bottom: 6px; }
.crq-check-part > header h3 { margin: 0; flex: 1; font-size: 1.05rem; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif; }
.crq-figs h4, .crq-marking h4 {
  margin: 16px 0 10px;
  font-size: 0.95rem;
  color: var(--kkd-saffron-deep);
  font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
}
.crq-fig-row { margin-bottom: 12px; }
.crq-fig-row label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.95rem; }
.crq-fig-input-wrap { display: flex; align-items: center; gap: 10px; }
.crq-fig-input-wrap input {
  font: inherit;
  font-size: 16px;
  padding: 10px 12px;
  border: 2px solid var(--kkd-line);
  border-radius: 6px;
  width: 220px;
  max-width: 60%;
}
.crq-fig-input-wrap input:focus { outline: none; border-color: var(--kkd-saffron); }
.crq-fig-input-wrap input.is-right { border-color: var(--kkd-ok); background: #eef7f0; }
.crq-fig-input-wrap input.is-wrong { border-color: var(--kkd-bad); background: #fbeeee; }
.crq-fig.verdict { font-size: 1.4rem; font-weight: 700; min-width: 28px; }
.crq-fig.verdict.is-right { color: var(--kkd-ok); }
.crq-fig.verdict.is-wrong { color: var(--kkd-bad); }
.crq-fig.verdict.is-warn { color: var(--kkd-saffron-deep); }
.crq-fig-answer { margin: 6px 0 0; font-size: 0.9rem; color: var(--kkd-ink-soft); }
.crq-model { margin-top: 14px; border: 2px dashed var(--kkd-line); border-radius: 8px; }
.crq-model summary {
  cursor: pointer;
  padding: 12px 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--kkd-ink);
  list-style: none;
}
.crq-model summary::-webkit-details-marker { display: none; }
.crq-model summary .material-icons { color: var(--kkd-saffron); }
.crq-model-body { padding: 4px 16px 16px; line-height: 1.65; }
.crq-model-body ul { padding-left: 20px; }
.crq-tutor-note {
  background: #fff8ec;
  border-left: 4px solid var(--kkd-saffron);
  padding: 10px 14px;
  font-size: 0.92rem;
}
.crq-point {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 9px 10px;
  border-radius: 6px;
  cursor: pointer;
  line-height: 1.55;
}
.crq-point:hover { background: var(--kkd-paper); }
.crq-point input { margin-top: 4px; width: 18px; height: 18px; accent-color: var(--kkd-saffron); flex-shrink: 0; }

@media (max-width: 640px) {
  .crq-panel { padding: 16px; }
  .crq-tab { font-size: 0.82rem; }
  .crq-tab .material-icons { display: none; }
  .crq-title-wrap h1 { font-size: 1.05rem; }
  .crq-grid td { min-width: 84px; }
  .crq-req { flex-wrap: wrap; }
}

/* ── Formatting toolbar ── */
.crq-format-bar {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
  margin: 0 0 10px;
  padding: 7px 10px;
  background: var(--kkd-paper);
  border: 1px solid var(--kkd-line);
}
.crq-format-bar button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 32px;
  padding: 0;
  background: transparent;
  border: 1px solid transparent;
  color: var(--kkd-ink);
  cursor: pointer;
}
.crq-format-bar button:hover { background: #fff; border-color: var(--kkd-line); }
.crq-format-bar button.is-on { background: var(--kkd-ink); color: #fff; }
.crq-format-bar .material-icons { font-size: 20px; }
.crq-fmt-sep { width: 1px; height: 22px; background: var(--kkd-line); margin: 0 5px; flex: none; }
.crq-color-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 32px;
  color: var(--kkd-ink);
  cursor: pointer;
  overflow: hidden;
}
.crq-color-btn:hover { background: #fff; }
.crq-color-btn .material-icons { font-size: 20px; pointer-events: none; }
.crq-color-btn input[type="color"] {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
  border: 0;
  padding: 0;
}
.crq-sheet-hint kbd {
  font-family: inherit;
  font-size: 0.8em;
  background: #fff;
  border: 1px solid var(--kkd-line);
  border-bottom-width: 2px;
  padding: 1px 6px;
  white-space: nowrap;
}

/* ── Row/column resize handles ── */
.crq-grid th { user-select: none; -webkit-user-select: none; }
.crq-resize-col {
  position: absolute;
  top: 0;
  right: -4px;
  width: 8px;
  height: 100%;
  cursor: ew-resize;
  touch-action: none;
  z-index: 6;
}
.crq-resize-row {
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 8px;
  cursor: ns-resize;
  touch-action: none;
  z-index: 6;
}
.crq-resize-col:hover, .crq-resize-row:hover { background: var(--kkd-saffron); opacity: 0.55; }

/* ── Selection highlight ── */
.crq-cell.in-sel { background: rgba(217, 123, 27, 0.14); }
.crq-cell.is-active.in-sel { background: #fff8ec; }