/*
 * Components: chips, KPI tiles, list rows, empty states, details lists, job progress, logs,
 * the command palette, dialogs, appearance pickers and the question reader.
 */

/* ---- Chips: the status label ------------------------------------------------------------ */
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 8px; border-radius: 999px;
  font-size: var(--text-xs); font-weight: var(--weight-medium); line-height: 1.4;
  white-space: nowrap; vertical-align: middle;
}
.chip .bi { font-size: 11px; line-height: 1; }
.chip--neutral { background: var(--color-surface-alt);  color: var(--color-text-muted); }
.chip--primary { background: var(--color-primary-soft); color: var(--color-primary); }
.chip--success { background: var(--color-success-soft); color: var(--color-success-ink); }
.chip--warning { background: var(--color-warning-soft); color: var(--color-warning-ink); }
.chip--danger  { background: var(--color-danger-soft);  color: var(--color-danger-ink); }
.chip--info    { background: var(--color-info-soft);    color: var(--color-info-ink); }
.chip--outline { background: transparent; border: 1px solid var(--color-border-strong); color: var(--color-text-muted); }
a.chip:hover { text-decoration: none; filter: brightness(.97); }
.chip-group { display: inline-flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.spin { display: inline-block; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- KPI strip and stat tiles ------------------------------------------------------------ */
.kpi-strip { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-5); }
.kpi {
  flex: 1 1 160px; min-width: 0;
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  color: var(--color-text);
  transition: border-color var(--dur-xs) var(--ease-out);
}
a.kpi:hover { border-color: var(--color-border-strong); text-decoration: none; color: var(--color-text); }
.kpi-icon {
  width: 40px; height: 40px; flex-shrink: 0; border-radius: var(--radius-md);
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-primary-soft); color: var(--color-primary); font-size: 1.2rem;
}
.kpi[data-tone="success"] .kpi-icon { background: var(--color-success-soft); color: var(--color-success-ink); }
.kpi[data-tone="warning"] .kpi-icon { background: var(--color-warning-soft); color: var(--color-warning-ink); }
.kpi[data-tone="danger"] .kpi-icon  { background: var(--color-danger-soft);  color: var(--color-danger-ink); }
.kpi[data-tone="info"] .kpi-icon    { background: var(--color-info-soft);    color: var(--color-info-ink); }
.kpi[data-tone="neutral"] .kpi-icon { background: var(--color-surface-alt);  color: var(--color-text-muted); }
.kpi-text { min-width: 0; }
.kpi-value { font-size: var(--text-3xl); line-height: var(--lh-3xl); font-weight: var(--weight-bold); letter-spacing: -0.02em; }
.kpi-value.is-small { font-size: var(--text-lg); line-height: var(--lh-lg); font-weight: var(--weight-semibold); letter-spacing: -0.01em; }
.kpi[data-tone="danger"] .kpi-value { color: var(--color-danger-ink); }
.kpi[data-tone="warning"] .kpi-value { color: var(--color-warning-ink); }
.kpi-label { font-size: var(--text-xs); line-height: var(--lh-xs); font-weight: var(--weight-medium); color: var(--color-text-muted); }
.kpi-note { font-size: var(--text-xs); line-height: var(--lh-xs); margin-top: 2px; }
@media (max-width: 991.98px) { .kpi-value { font-size: var(--text-2xl); line-height: var(--lh-2xl); } }
@media (max-width: 640px) { .kpi { flex-basis: calc(50% - 6px); padding: var(--space-3); } .kpi .kpi-icon { display: none; } }

/* ---- Section heading inside a card ------------------------------------------------------ */
.section-heading {
  font-size: var(--text-xs); line-height: var(--lh-xs); font-weight: var(--weight-semibold);
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--color-text-muted); margin: 0 0 var(--space-2);
}
.eyebrow { font-size: var(--text-xs); line-height: var(--lh-xs); font-weight: var(--weight-semibold); text-transform: uppercase; letter-spacing: .06em; color: var(--color-text-subtle); }

/* ---- List rows (widget lists) ----------------------------------------------------------- */
.list-rows { list-style: none; margin: 0; padding: 0; }
.list-rows > li {
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-sm); line-height: var(--lh-sm);
}
.list-rows > li:last-child { border-bottom: 0; }
.list-rows .row-main { min-width: 0; display: flex; align-items: center; gap: var(--space-3); }
.list-rows .row-text { min-width: 0; }
.list-rows .row-title { font-weight: var(--weight-semibold); color: var(--color-text); }
.list-rows a.row-title:hover { color: var(--color-primary); }
.list-rows .row-meta { color: var(--color-text-muted); font-size: var(--text-xs); line-height: var(--lh-xs); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; }
.list-rows .row-side { flex-shrink: 0; text-align: right; display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
.list-rows .row-time { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-text-subtle); }
.list-rows > li.is-current { background: var(--color-primary-soft); box-shadow: inset 2px 0 0 var(--color-primary); }
.icon-bubble {
  width: 32px; height: 32px; flex-shrink: 0; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-surface-alt); color: var(--color-text-muted); font-size: 14px;
}
.icon-bubble[data-tone="success"] { background: var(--color-success-soft); color: var(--color-success-ink); }
.icon-bubble[data-tone="danger"]  { background: var(--color-danger-soft);  color: var(--color-danger-ink); }
.icon-bubble[data-tone="warning"] { background: var(--color-warning-soft); color: var(--color-warning-ink); }
.icon-bubble[data-tone="primary"] { background: var(--color-primary-soft); color: var(--color-primary); }
.icon-bubble[data-tone="info"]    { background: var(--color-info-soft);    color: var(--color-info-ink); }
.text-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---- Empty state ------------------------------------------------------------------------ */
.empty-state { text-align: center; padding: var(--space-10) var(--space-6); }
.empty-state .empty-icon { font-size: 44px; line-height: 1; color: var(--color-text-subtle); display: block; margin-bottom: var(--space-3); }
.empty-state .empty-title { font-size: var(--text-lg); line-height: var(--lh-lg); font-weight: var(--weight-semibold); color: var(--color-text); margin: 0 0 var(--space-1); }
.empty-state .empty-body { color: var(--color-text-muted); max-width: 380px; margin: 0 auto; font-size: var(--text-sm); line-height: var(--lh-sm); }
.empty-state .btn { margin-top: var(--space-4); }
.empty-state.is-compact { padding: var(--space-6) var(--space-4); }
.empty-state.is-compact .empty-icon { font-size: 28px; }
td .empty-state { white-space: normal; }

/* ---- Details lists ---------------------------------------------------------------------- */
.meta-list { display: grid; grid-template-columns: minmax(120px, max-content) minmax(0, 1fr); gap: var(--space-2) var(--space-5); margin: 0; font-size: var(--text-sm); line-height: var(--lh-sm); }
.meta-list dt { font-weight: var(--weight-medium); color: var(--color-text-muted); }
.meta-list dd { margin: 0; color: var(--color-text); min-width: 0; overflow-wrap: anywhere; }
.meta-list.is-wide { grid-template-columns: minmax(160px, max-content) minmax(0, 1fr); }
@media (max-width: 480px) { .meta-list { grid-template-columns: minmax(0, 1fr); gap: 2px; } .meta-list dd { margin-bottom: var(--space-2); } }

/* ---- Job progress ----------------------------------------------------------------------- */
.job-progress .job-progress-head { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); flex-wrap: wrap; margin-bottom: var(--space-2); }
.job-progress .job-phase { font-weight: var(--weight-semibold); text-transform: capitalize; margin-left: var(--space-1); }
.job-progress .job-numbers { font-size: var(--text-xs); color: var(--color-text-muted); font-family: var(--font-mono); display: flex; gap: var(--space-3); }
.job-progress .job-message { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-2); min-height: var(--lh-sm); }
.progress-bar.indeterminate { opacity: .55; }
.job-item + .job-item { margin-top: var(--space-4); padding-top: var(--space-4); border-top: 1px solid var(--color-border); }
.job-item-title { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-2); font-weight: var(--weight-semibold); }

/* ---- Logs ------------------------------------------------------------------------------- */
.log-box {
  margin: 0;
  background: var(--color-surface-alt); color: var(--color-text);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: var(--space-3);
  font-family: var(--font-mono); font-size: var(--text-xs); line-height: 1.6;
  max-height: 22rem; overflow: auto; white-space: pre-wrap; word-break: break-word;
}

/* ---- Segmented control ------------------------------------------------------------------ */
.segmented {
  display: inline-flex; padding: 3px; gap: 2px;
  background: var(--color-surface-alt); border: 1px solid var(--color-border); border-radius: var(--radius-md);
}
.segmented a, .segmented button {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border: 0; border-radius: var(--radius-sm);
  background: transparent; color: var(--color-text-muted);
  font-size: var(--text-sm); font-weight: var(--weight-medium); line-height: var(--lh-sm);
}
.segmented a:hover, .segmented button:hover { color: var(--color-text); text-decoration: none; }
.segmented .is-active { background: var(--color-surface); color: var(--color-primary); box-shadow: var(--shadow-xs); }

/* ---- Toolbar above a table -------------------------------------------------------------- */
.toolbar { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.toolbar .search-field { position: relative; flex: 1 1 220px; min-width: 0; }
.toolbar .search-field .bi { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); color: var(--color-text-subtle); pointer-events: none; }
.toolbar .search-field .form-control { padding-left: 34px; }
.toolbar .form-select { width: auto; min-width: 150px; }
@media (max-width: 640px) { .toolbar .form-select { flex: 1 1 140px; } }

/* ---- Exam picker ------------------------------------------------------------------------ */
.exam-picker { max-height: 62vh; overflow-y: auto; }
.exam-picker thead th { position: sticky; top: 0; z-index: 1; background: var(--color-surface); }
.code-badge {
  display: inline-block; font-family: var(--font-mono); font-size: var(--text-sm); font-weight: 400;
  color: var(--color-text); letter-spacing: 0;
}
.exam-panel .exam-code { font-size: var(--text-2xl); line-height: var(--lh-2xl); font-weight: var(--weight-semibold); letter-spacing: -0.01em; margin: 2px 0 0; }
.exam-panel .exam-name { color: var(--color-text-muted); margin-top: 2px; }
.option-box { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: var(--space-4); background: var(--color-bg); }

/* ---- Command palette -------------------------------------------------------------------- */
.palette { position: fixed; inset: 0; z-index: 1090; }
.palette[hidden] { display: none; }
.palette-backdrop { position: absolute; inset: 0; background: rgba(15, 23, 32, .55); animation: fadeIn var(--dur-md) var(--ease-out); }
[data-theme="dark"] .palette-backdrop { background: rgba(0, 0, 0, .7); }
.palette-panel {
  position: relative; margin: 12vh auto 0; width: calc(100% - 32px); max-width: 560px;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); overflow: hidden;
  animation: paletteIn var(--dur-md) var(--ease-out);
}
.palette-search { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-4); border-bottom: 1px solid var(--color-border); }
.palette-search .bi { color: var(--color-text-subtle); font-size: 1.1rem; }
.palette-search input { flex: 1; border: 0; outline: none; background: transparent; color: var(--color-text); font-size: var(--text-lg); line-height: var(--lh-lg); min-width: 0; }
.palette-search input::placeholder { color: var(--color-text-subtle); }
.palette-list { list-style: none; margin: 0; padding: var(--space-2); max-height: 60vh; overflow-y: auto; }
.palette-group { padding: var(--space-2) var(--space-3) var(--space-1); font-size: 10px; font-weight: var(--weight-semibold); text-transform: uppercase; letter-spacing: .08em; color: var(--color-text-subtle); }
.palette-item { display: flex; align-items: center; gap: var(--space-3); padding: 8px var(--space-3); border-radius: var(--radius-sm); color: var(--color-text); cursor: pointer; }
.palette-item .bi { color: var(--color-text-muted); width: 18px; text-align: center; }
.palette-item .palette-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.palette-item .palette-section { font-size: var(--text-xs); color: var(--color-text-subtle); flex-shrink: 0; }
.palette-item.is-active { background: var(--color-primary-soft); color: var(--color-primary); }
.palette-item.is-active .bi { color: var(--color-primary); }
.palette-empty { padding: var(--space-6); text-align: center; color: var(--color-text-muted); font-size: var(--text-sm); }
.palette-foot { display: flex; gap: var(--space-4); padding: var(--space-2) var(--space-4); border-top: 1px solid var(--color-border); font-size: var(--text-xs); color: var(--color-text-subtle); }

/* ---- Dialog (confirmations) ------------------------------------------------------------- */
.dialog { position: fixed; inset: 0; z-index: 1070; display: flex; align-items: flex-start; justify-content: center; padding: 16px; }
.dialog-backdrop { position: absolute; inset: 0; background: rgba(15, 23, 32, .55); animation: fadeIn var(--dur-md) var(--ease-out); }
[data-theme="dark"] .dialog-backdrop { background: rgba(0, 0, 0, .7); }
.dialog-panel {
  position: relative; margin-top: 12vh; width: 100%; max-width: 440px;
  background: var(--color-surface); color: var(--color-text);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: var(--space-6);
  animation: paletteIn var(--dur-md) var(--ease-out);
}
.dialog-icon {
  width: 44px; height: 44px; border-radius: 50%; margin-bottom: var(--space-3);
  display: inline-flex; align-items: center; justify-content: center; font-size: 20px;
  background: var(--color-primary-soft); color: var(--color-primary);
}
.dialog[data-tone="danger"] .dialog-icon { background: var(--color-danger-soft); color: var(--color-danger-ink); }
.dialog-title { font-size: var(--text-xl); line-height: var(--lh-xl); font-weight: var(--weight-semibold); margin: 0 0 var(--space-2); }
.dialog-message { color: var(--color-text-muted); margin: 0; }
.dialog-actions { display: flex; justify-content: flex-end; gap: var(--space-2); margin-top: var(--space-6); }
body.dialog-open { overflow: hidden; }

/* ---- Appearance pickers ----------------------------------------------------------------- */
.choice-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: var(--space-3); }
.choice-card { position: relative; display: block; margin: 0; cursor: pointer; }
.choice-card input { position: absolute; opacity: 0; pointer-events: none; }
.choice-card .choice-body {
  display: flex; flex-direction: column; gap: var(--space-2);
  padding: var(--space-3); height: 100%;
  border: 1px solid var(--color-border-strong); border-radius: var(--radius-md);
  background: var(--color-surface); transition: border-color var(--dur-xs) var(--ease-out), box-shadow var(--dur-xs) var(--ease-out);
}
.choice-card:hover .choice-body { border-color: var(--color-text-subtle); }
.choice-card input:checked + .choice-body { border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-focus-ring); }
.choice-card input:focus-visible + .choice-body { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.choice-card .choice-title { font-weight: var(--weight-medium); display: flex; align-items: center; gap: var(--space-2); }
.choice-card .choice-title .bi { color: var(--color-text-muted); }
.choice-card .choice-hint { font-size: var(--text-xs); line-height: var(--lh-xs); color: var(--color-text-muted); }
.theme-preview { height: 56px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); display: flex; overflow: hidden; }
.theme-preview span { flex: 1; }
.theme-preview .tp-light { background: linear-gradient(180deg, #FFFFFF 0 30%, #F7F8FA 30%); }
.theme-preview .tp-dark { background: linear-gradient(180deg, #141416 0 30%, #0C0C0E 30%); }
.swatch-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.swatch { position: relative; margin: 0; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 6px; font-size: var(--text-xs); color: var(--color-text-muted); }
.swatch input { position: absolute; opacity: 0; pointer-events: none; }
.swatch .swatch-dot { width: 36px; height: 36px; border-radius: 50%; border: 3px solid var(--color-surface); box-shadow: 0 0 0 1px var(--color-border-strong); transition: box-shadow var(--dur-xs) var(--ease-out); }
.swatch input:checked + .swatch-dot { box-shadow: 0 0 0 2px var(--color-primary); }
.swatch input:focus-visible + .swatch-dot { outline: 2px solid var(--color-primary); outline-offset: 3px; }
.swatch input:checked ~ .swatch-name { color: var(--color-text); font-weight: var(--weight-medium); }
.swatch-dot[data-swatch="teal"]    { background: #1C7293; }
.swatch-dot[data-swatch="indigo"]  { background: #4F46E5; }
.swatch-dot[data-swatch="violet"]  { background: #7C3AED; }
.swatch-dot[data-swatch="amber"]   { background: #B45309; }
.swatch-dot[data-swatch="rose"]    { background: #BE185D; }
.swatch-dot[data-swatch="emerald"] { background: #047857; }
.swatch-dot[data-swatch="custom"]  { background: conic-gradient(#E11D48, #D97706, #059669, #2E9CB8, #4F46E5, #7C3AED, #E11D48); }
.color-field { display: flex; align-items: center; gap: var(--space-3); }
.color-field input[type="color"] { width: 56px; height: 38px; padding: 2px; }
.logo-preview { display: flex; align-items: center; gap: var(--space-4); padding: var(--space-3); border: 1px dashed var(--color-border-strong); border-radius: var(--radius-md); background: var(--color-surface-alt); }
.logo-preview img { max-width: 220px; max-height: 64px; object-fit: contain; }
.settings-section + .settings-section { border-top: 1px solid var(--color-border); margin-top: var(--space-5); padding-top: var(--space-5); }

/* ---- Question reader -------------------------------------------------------------------- */
.reader { max-width: 920px; }
.reader-toolbar { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; margin-bottom: var(--space-4); }
.reader-toolbar .search-field { flex: 1 1 260px; }
.jump-input { width: 7.5rem; }
.question-card { margin-bottom: var(--space-4); scroll-margin-top: calc(var(--topbar-h) + 16px); }
.question-card .q-head { display: flex; justify-content: space-between; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.q-number {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: var(--weight-semibold); color: var(--color-text); margin: 0;
}
.q-number .num {
  min-width: 28px; height: 28px; padding: 0 8px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-primary-soft); color: var(--color-primary); font-size: var(--text-xs); font-weight: var(--weight-bold);
}
.q-meta { font-size: var(--text-xs); color: var(--color-text-subtle); font-family: var(--font-mono); text-align: right; }
.q-text { font-size: 1rem; line-height: 1.65; margin-bottom: var(--space-3); overflow-wrap: anywhere; }
.q-text p { margin: 0 0 var(--space-2); }
.q-text p:last-child { margin-bottom: 0; }
.choices { list-style: none; margin: 0 0 var(--space-4); padding: 0; display: grid; gap: 6px; }
.choice {
  display: flex; gap: var(--space-2); align-items: baseline;
  padding: 8px var(--space-3);
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  background: var(--color-surface); line-height: 1.55; overflow-wrap: anywhere;
}
.choice-letter { flex-shrink: 0; min-width: 1.6em; font-weight: var(--weight-semibold); color: var(--color-text-muted); }
.choice-text { min-width: 0; }
.choice-text .q-image { margin: 4px 0 2px; }
.choice.is-answer { border-color: var(--color-success); background: var(--color-success-soft); }
.choice.is-answer .choice-letter { color: var(--color-success-ink); }
.answer-box {
  display: flex; gap: var(--space-3); align-items: flex-start;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-success-soft); color: var(--color-success-ink);
  border: 1px solid var(--color-success);
}
.answer-box > .bi { font-size: 1.1em; line-height: var(--lh-md); }
.answer-box > div { flex: 1; min-width: 0; }
.answer-box .answer-text { color: var(--color-text); }
.answer-box .answer-votes { font-size: var(--text-xs); color: var(--color-text-muted); margin-top: 2px; }
/* An answer corrected in the reader, your note, and the hints that an answer needs checking. */
.answer-box.is-corrected { background: var(--color-primary-soft); color: var(--color-primary); border-color: var(--color-primary); }
.answer-note { margin-top: var(--space-2); padding-top: var(--space-2); border-top: 1px dashed var(--color-border-strong); font-size: var(--text-sm); color: var(--color-text); }
.answer-note-label { display: block; margin-bottom: 2px; font-size: var(--text-xs); font-weight: var(--weight-semibold); color: var(--color-text-muted); }
.answer-note p { margin: 0 0 4px; }
.answer-note p:last-child { margin-bottom: 0; }
.answer-check {
  display: flex; gap: var(--space-3); align-items: flex-start; margin-top: var(--space-2);
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-md);
  background: var(--color-warning-soft); color: var(--color-warning-ink); border: 1px solid var(--color-warning);
}
.answer-check > .bi { font-size: 1.1em; line-height: var(--lh-md); }
.answer-check-title { font-weight: var(--weight-semibold); }
.answer-check-list { margin: 4px 0 0; padding-left: 1.1em; font-size: var(--text-sm); color: var(--color-text); }
.answer-check-claims { margin-top: 6px; font-size: var(--text-xs); color: var(--color-text-muted); }
.answer-edit { margin-top: var(--space-2); }
.answer-edit > summary {
  list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; padding: 4px 0;
  font-size: var(--text-sm); font-weight: var(--weight-medium); color: var(--color-primary);
}
.answer-edit > summary::-webkit-details-marker { display: none; }
.answer-edit > summary:hover { text-decoration: underline; }
.answer-edit-body { margin-top: var(--space-2); padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface-alt); }
.answer-edit-body legend { font-size: var(--text-sm); }
.letter-picks { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.letter-pick { position: relative; cursor: pointer; margin: 0; }
.letter-pick input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.letter-pick span {
  display: inline-flex; align-items: center; justify-content: center; min-width: 2.25rem; height: 2.25rem; padding: 0 .5rem;
  border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm); background: var(--color-surface);
  font-family: var(--font-mono); font-weight: var(--weight-semibold); color: var(--color-text);
  transition: background var(--dur-sm) var(--ease-out), border-color var(--dur-sm) var(--ease-out);
}
.letter-pick:hover span { border-color: var(--color-primary); }
.letter-pick input:checked + span { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-on-accent); }
.letter-pick input:focus-visible + span { outline: 2px solid var(--color-focus-ring); outline-offset: 2px; }
.answer-edit-actions { margin-top: var(--space-3); display: flex; gap: var(--space-2); }
.answer-edit-remove { margin-top: var(--space-2); }
.explanation { margin-top: var(--space-3); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); background: var(--color-surface-alt); line-height: 1.6; }
.discussion { margin-top: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.discussion > summary {
  list-style: none; cursor: pointer; padding: 10px var(--space-4);
  display: flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-sm); font-weight: var(--weight-medium); color: var(--color-text-muted);
}
.discussion > summary::-webkit-details-marker { display: none; }
.discussion > summary .bi-chevron-right { transition: transform var(--dur-sm) var(--ease-out); font-size: 12px; }
.discussion[open] > summary .bi-chevron-right { transform: rotate(90deg); }
.discussion > summary:hover { color: var(--color-text); }
.discussion-body { padding: 0 var(--space-4) var(--space-2); }
.comment {
  display: flex; gap: var(--space-3); align-items: flex-start;
  padding: var(--space-3) 0; border-top: 1px solid var(--color-border);
  font-size: var(--text-sm); line-height: 1.6; overflow-wrap: anywhere;
}
.comment:first-child { border-top: 0; }
.comment-avatar {
  flex-shrink: 0; width: 32px; height: 32px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--color-primary-soft); color: var(--color-primary);
  font-size: var(--text-xs); font-weight: var(--weight-semibold);
}
.comment.is-top .comment-avatar { background: var(--color-primary); color: var(--color-on-accent); }
.comment-main { flex: 1; min-width: 0; }
.comment-head { display: flex; flex-wrap: wrap; align-items: center; gap: 4px var(--space-2); margin-bottom: 2px; }
.comment-author { font-weight: var(--weight-semibold); color: var(--color-text); }
.comment-time { font-size: var(--text-xs); color: var(--color-text-subtle); }
.comment-body { color: var(--color-text); }
.comment-body p, .explanation p { margin: 0 0 6px; }
.comment-body p:last-child, .explanation p:last-child { margin-bottom: 0; }
.comment-foot { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); margin-top: 6px; font-size: var(--text-xs); color: var(--color-text-muted); }
.comment-votes { display: inline-flex; align-items: center; gap: 4px; }
.q-image { max-width: 100%; height: auto; display: block; margin: var(--space-2) 0 var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-sm); background: #fff; }
.q-foot { margin-top: var(--space-3); display: flex; justify-content: space-between; align-items: center; gap: var(--space-2); flex-wrap: wrap; }
.error-card { max-width: 560px; }
.palette-search input:focus, .palette-search input:focus-visible { outline: none; box-shadow: none; }

/* ---- Data tables (js/data-table.js) ----------------------------------------------------- */
.dt-toolbar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2);
  padding: var(--space-3) var(--space-5); border-bottom: 1px solid var(--color-border);
}
.dt-toolbar .dt-search { position: relative; flex: 0 1 260px; min-width: 180px; }
.dt-toolbar .dt-search .bi { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: var(--color-text-subtle); pointer-events: none; font-size: 13px; }
.dt-toolbar .dt-search .form-control { padding-left: 30px; }
.dt-tools { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.dt-length { display: inline-flex; align-items: center; gap: 6px; font-size: var(--text-sm); color: var(--color-text-muted); margin: 0; }
.dt-length .form-select { width: auto; padding-right: 30px; }
.dt-menu { position: relative; }
.dt-menu-panel {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 20; min-width: 200px; max-height: 320px; overflow-y: auto;
  padding: var(--space-2); background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); box-shadow: var(--shadow-md); animation: menuIn var(--dur-md) var(--ease-out);
}
.dt-menu-item { display: flex; align-items: center; gap: var(--space-2); padding: 6px 8px; border-radius: var(--radius-sm); font-size: var(--text-sm); cursor: pointer; margin: 0; white-space: nowrap; }
.dt-menu-item:hover { background: var(--color-surface-alt); }
.dt-menu-item .form-check-input { margin: 0; }
.dt-footer {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-2);
  padding: var(--space-3) var(--space-5); border-top: 1px solid var(--color-border);
}
.dt-info { font-size: var(--text-sm); color: var(--color-text-muted); }
.dt-pager { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.dt-page {
  min-width: 32px; height: 32px; padding: 0 8px;
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--color-border-strong); border-radius: var(--radius-sm);
  background: var(--color-surface); color: var(--color-text); font-size: var(--text-sm);
}
.dt-page:hover:not(:disabled) { background: var(--color-surface-alt); }
.dt-page:disabled { color: var(--color-text-subtle); border-color: var(--color-border); cursor: default; }
.dt-page.is-active, .dt-page.is-active:disabled { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-on-accent); }
.dt-gap { color: var(--color-text-subtle); padding: 0 4px; }
.table th .dt-sort {
  all: unset; cursor: pointer; display: inline-flex; align-items: center; gap: 6px;
  font: inherit; color: inherit; text-transform: inherit; letter-spacing: inherit; white-space: nowrap;
}
.table th .dt-sort::after {
  content: ""; width: 0; height: 0; border-left: 4px solid transparent; border-right: 4px solid transparent;
  border-top: 5px solid currentColor; opacity: .35;
}
.table th[aria-sort] .dt-sort { color: var(--color-text); }
.table th[aria-sort="ascending"] .dt-sort::after { border-top: 0; border-bottom: 5px solid currentColor; opacity: 1; }
.table th[aria-sort="descending"] .dt-sort::after { opacity: 1; }
.table th.dt-secondary .dt-sort::after { opacity: .6; }
.table th .dt-sort:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }
.table th.text-end .dt-sort { flex-direction: row-reverse; }
.dt-hidden { display: none !important; }
.table tr.dt-empty td { text-align: center; color: var(--color-text-muted); padding: var(--space-6) !important; }
@media (max-width: 640px) {
  .dt-toolbar, .dt-footer { padding: var(--space-2) var(--space-3); }
  .dt-toolbar .dt-search { flex: 1 1 100%; }
  .dt-tools .btn span, .dt-tools .btn { font-size: var(--text-xs); }
  .table.table-stack > tbody > tr.dt-empty { border: 0; }
  .table.table-stack > tbody > tr.dt-empty > td { justify-content: center; }
}
.error-details { margin-top: 2px; }
.error-details > summary { cursor: pointer; list-style: none; }
.error-details > summary::-webkit-details-marker { display: none; }
.error-details > summary::after { content: " Details"; color: var(--color-text-muted); text-decoration: underline; font-size: var(--text-xs); }
.error-details[open] > summary::after { content: " Hide"; }
.error-details .log-box { max-height: 12rem; white-space: pre-wrap; }
.comment.is-reply { margin-left: 44px; padding-left: var(--space-3); border-left: 2px solid var(--color-border); }
.log-box.log-live { max-height: 28rem; }
.live-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--color-success); box-shadow: 0 0 0 3px var(--color-success-soft); vertical-align: middle; animation: livePulse 1.6s ease-in-out infinite; }
.live-dot.is-done { background: var(--color-border-strong); box-shadow: none; animation: none; }
@keyframes livePulse { 50% { opacity: .35; } }
/* A failed document: a small marker whose reason opens on hover (title) or click. */
.error-pop { position: relative; display: inline-flex; }
.error-pop > summary { list-style: none; cursor: pointer; }
.error-pop > summary::-webkit-details-marker { display: none; }
.error-pop-trigger {
  display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px;
  border-radius: 50%; color: var(--color-danger); font-size: 16px;
}
.error-pop-trigger:hover, .error-pop[open] .error-pop-trigger { background: var(--color-danger-soft); }
.error-pop-trigger:focus-visible { outline: 2px solid var(--color-danger); outline-offset: 2px; }
.error-pop-body {
  position: absolute; z-index: 30; top: calc(100% + 6px); right: 0; width: 20rem; max-width: 80vw;
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
  background: var(--color-surface); border: 1px solid var(--color-border); box-shadow: var(--shadow-md);
  color: var(--color-text); font-size: var(--text-xs); line-height: var(--lh-xs); white-space: normal; text-align: left;
}
.error-pop-body strong { color: var(--color-danger-ink); }

/* Collect page: "Exam not listed? Collect from links", a card that opens. */
.links-import > summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; }
.links-import > summary::-webkit-details-marker { display: none; }
.links-import:not([open]) > summary { border-bottom: 0; }
.links-import-caret { transition: transform var(--dur-sm) var(--ease-out); color: var(--color-text-muted); }
.links-import[open] .links-import-caret { transform: rotate(180deg); }

/* A large exam's PDF in parts: one download button per part. */
.doc-parts { display: inline-flex; flex-direction: column; align-items: stretch; gap: 4px; }
.doc-parts .btn { justify-content: flex-start; }

/* Inbox: unread rows stand out. */
.list-rows li.is-unread { background: var(--color-primary-soft); }
.list-rows li.is-unread .row-title { font-weight: var(--weight-semibold); }
/* Requests: the status beside the exam, the buttons in one row under it, and the answer form
   opening full width below them. */
.list-rows > li.request-row { flex-wrap: wrap; }
.request-row .row-title .chip { margin-left: var(--space-1); vertical-align: middle; }
.request-actions, .request-row .request-answer-body { flex-basis: 100%; margin-left: 44px; }
.request-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); margin-top: var(--space-2); }
.request-row .request-answer-body { max-width: 560px; }
@media (max-width: 575.98px) { .request-actions, .request-row .request-answer-body { margin-left: 0; } }
.request-answer > summary { list-style: none; }
.request-answer > summary::-webkit-details-marker { display: none; }
.request-answer[open] { flex-basis: 100%; }
.request-answer-body { margin-top: var(--space-2); padding: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface-alt); }
/* Backups: the actions sit in one row under each backup's details. */
.backup-actions { flex-basis: 100%; display: flex; flex-wrap: wrap; align-items: flex-start; gap: var(--space-2); padding-left: 44px; margin-top: var(--space-2); }
.backup-actions .request-answer[open] { flex-basis: 100%; order: 3; }
@media (max-width: 575.98px) { .backup-actions { padding-left: 0; } }

/* ---- Practice mode: picking, checking and the reveal -------------------------------------- */
.practice-bar {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--space-3);
  margin-bottom: var(--space-4); padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-surface);
  font-size: var(--text-sm); color: var(--color-text-muted);
}
.practice-score { display: inline-flex; align-items: center; gap: var(--space-2); }
.practice-actions { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.choices[data-pickable] .choice { cursor: pointer; user-select: none; transition: border-color var(--dur-xs) var(--ease-out), background-color var(--dur-xs) var(--ease-out); }
.choices[data-pickable] .choice:hover { border-color: var(--color-border-strong); background: var(--color-surface-alt); }
.choices[data-pickable] .choice:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
/* A pick is neutral until the answer is revealed. */
.choice.is-picked { border-color: var(--color-text-subtle); background: var(--color-surface-alt); box-shadow: inset 0 0 0 1px var(--color-text-subtle); }
.choice.is-picked .choice-letter { color: var(--color-text); }
.question-card.is-revealed .choices[data-pickable] .choice { cursor: default; }
.question-card.is-revealed .choice.is-answer { border-color: var(--color-success); background: var(--color-success-soft); box-shadow: none; }
.choice.is-wrong { border-color: var(--color-danger); background: var(--color-danger-soft); box-shadow: none; }
.choice.is-wrong .choice-letter { color: var(--color-danger-ink); }
.choice-tag { margin-left: auto; padding-left: var(--space-2); align-self: center; white-space: nowrap; font-size: var(--text-xs); color: var(--color-text-muted); }
.choice.is-answer .choice-tag { color: var(--color-success-ink); }
.choice.is-wrong .choice-tag { color: var(--color-danger-ink); }
.practice-verdict {
  display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-3);
  font-size: var(--text-sm); font-weight: var(--weight-medium);
}
.practice-verdict.is-right { color: var(--color-success-ink); }
.practice-verdict.is-wrong { color: var(--color-danger-ink); }
/* The reveal slides open: the row grows from 0 to its content's height. */
.reveal-target { display: grid; grid-template-rows: 0fr; opacity: 0; transition: grid-template-rows .28s var(--ease-out), opacity .2s var(--ease-out); }
.reveal-target.is-open { grid-template-rows: 1fr; opacity: 1; }
.reveal-inner { min-height: 0; overflow: hidden; }
.reveal-target.is-open .reveal-inner > :first-child { margin-top: var(--space-3); }
[data-motion="reduced"] .reveal-target { transition: none; }
@media (prefers-reduced-motion: reduce) { .reveal-target { transition: none; } }

/* ---- Highlighted things carry their colour as a tint, without an outline (both themes) ------ */
.alert { --bs-alert-border-color: transparent; }
.answer-box, .answer-box.is-corrected, .answer-check { border-color: transparent; }
.choice.is-answer, .choice.is-wrong, .question-card.is-revealed .choice.is-answer { border-color: transparent; box-shadow: none; }
/* A pick is a neutral grey fill until the answer is revealed. */
.choice.is-picked { border-color: transparent; box-shadow: none; background: color-mix(in srgb, var(--color-text) 9%, var(--color-surface)); }
/* Once revealed, a pick takes the verdict's colour: green when right, red when wrong. */
.choice.is-picked.is-answer, .question-card.is-revealed .choice.is-answer { background: var(--color-success-soft); }
.choice.is-wrong, .choice.is-picked.is-wrong { background: var(--color-danger-soft); }