/* ==========================================================================
   StudySpace — student area and exam paper
   Dashboard · printed question paper · answer sheet / result
   ========================================================================== */

/* ============================== DASHBOARD ============================== */

.dash-head {
  background: var(--canvas);
  border-bottom: 1px solid var(--border);
  padding-block: var(--sp-7) var(--sp-6);
}

.dash-head-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-6);
  flex-wrap: wrap;
}

.dash-head h1 {
  font-size: clamp(1.6rem, 1.3rem + 1.2vw, var(--text-2xl));
  margin-bottom: 6px;
}

.dash-head p {
  color: var(--text-muted);
  font-size: var(--text-sm);
  max-width: 56ch;
}

.dash-figures {
  display: flex;
  gap: var(--sp-6);
  flex-wrap: wrap;
}

.dash-figure strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1.1;
}

.dash-figure span {
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
}

.dash-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--sp-7);
  align-items: start;
  padding-block: var(--sp-7) var(--sp-9);
}

/* Continue learning */
.continue-card {
  display: flex;
  gap: var(--sp-4);
  align-items: center;
  padding: var(--sp-4) var(--sp-5);
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.continue-card:hover { border-color: var(--border-strong); transform: translateY(-1px); }

.continue-thumb {
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: rgba(91, 91, 246, 0.14);
  color: var(--violet-400);
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--text-subtle);
}

.continue-body { flex: 1 1 auto; min-width: 0; display: grid; gap: 8px; }
.continue-body h3 { font-size: var(--text-sm); font-weight: 600; }
.continue-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  font-size: var(--text-2xs);
  color: var(--text-subtle);
}

/* Streak */
.streak-card { padding: var(--sp-5); display: grid; gap: var(--sp-4); }
.streak-head { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--sp-3); }

.streak-count {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1;
}

.streak-count small {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-subtle);
  margin-left: 6px;
}

.streak-flame {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border-radius: var(--r-sm);
  background: var(--amber-100);
  color: var(--amber-600);
}
.streak-flame svg { width: 18px; height: 18px; }

.streak-days { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.streak-day { display: grid; gap: 6px; justify-items: center; }

.streak-dot {
  width: 26px; height: 26px;
  display: grid;
  place-items: center;
  border-radius: var(--r-xs);
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--paper);
  font-size: 11px;
}

.streak-dot svg { width: 13px; height: 13px; }
.streak-dot.is-done { background: var(--slate-100); border-color: var(--slate-200); color: var(--text-muted); }
.streak-dot.is-today { background: var(--ink-900); border-color: var(--ink-900); color: var(--text-invert); }
.streak-day small { font-size: 10px; color: var(--text-subtle); }

/* Upcoming tests */
.upcoming-list { display: grid; gap: 0; border-top: 1px solid var(--border); }

.upcoming-item {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-4) 2px;
  border-bottom: 1px solid var(--border);
}

.upcoming-date {
  width: 46px;
  flex: 0 0 auto;
  text-align: center;
  border-right: 1px solid var(--border);
  padding-right: var(--sp-3);
}

.upcoming-date strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-strong);
  line-height: 1;
}

.upcoming-date span {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-subtle);
}

.upcoming-body { flex: 1 1 auto; min-width: 0; }
.upcoming-body strong { display: block; font-size: var(--text-sm); font-weight: 600; color: var(--text-strong); }
.upcoming-body small { font-size: var(--text-xs); color: var(--text-muted); }

/* Performance chart */
.chart-card { padding: var(--sp-6); }
.chart-bars { display: flex; align-items: flex-end; gap: var(--sp-3); height: 140px; padding-top: var(--sp-4); }

.chart-bar {
  flex: 1;
  display: grid;
  align-content: end;
  gap: 6px;
  justify-items: center;
  height: 100%;
}

.chart-bar .bar {
  width: 100%;
  max-width: 42px;
  background: var(--slate-200);
  border-radius: 2px 2px 0 0;
  min-height: 4px;
}

.chart-bar .bar.is-best { background: var(--violet-600); }
.chart-bar small { font-size: 10px; color: var(--text-subtle); }

.chart-legend {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
  margin-top: var(--sp-5);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Notes */
.note-preview {
  padding: var(--sp-4) var(--sp-5);
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  display: grid;
  gap: 6px;
}

.note-preview h3 { font-size: var(--text-sm); font-weight: 600; }
.note-preview p { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.65; }

@media (max-width: 1024px) {
  .dash-layout { grid-template-columns: minmax(0, 1fr); }
}

/* ============================== INTRO ================================== */

.intro-shell {
  min-height: 100dvh;
  display: grid;
  place-items: start center;
  padding: var(--sp-9) var(--sp-5) var(--sp-10);
  background: var(--canvas);
}

.intro-card {
  width: min(760px, 100%);
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: clamp(24px, 4vw, 48px);
}

.intro-head { border-bottom: 1px solid var(--border); padding-bottom: var(--sp-5); }

.intro-head h1 {
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, var(--text-2xl));
  margin-block: 6px var(--sp-2);
}

.intro-head p:last-child { color: var(--text-muted); font-size: var(--text-md); }

.intro-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--sp-4);
  padding-block: var(--sp-5);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--sp-5);
}

.intro-meta dt {
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: 4px;
}

.intro-meta dd {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-strong);
}

.intro-instructions h2 {
  font-size: var(--text-md);
  margin-bottom: var(--sp-3);
}

.intro-instructions ol {
  display: grid;
  gap: 8px;
  padding-left: 1.15em;
  color: var(--text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.intro-instructions li::marker { color: var(--slate-400); }

.intro-note {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: var(--sp-5);
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  border-left: 3px solid var(--violet-600);
  background: var(--slate-50);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.intro-note.is-warning {
  border-left-color: var(--amber-600);
  background: var(--amber-100);
  color: var(--amber-800);
}

.intro-note svg { width: 16px; height: 16px; flex: 0 0 auto; margin-top: 2px; }

.intro-agree { margin-top: var(--sp-5); align-items: flex-start; }

.intro-actions {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-top: var(--sp-5);
}

.intro-foot { margin-top: var(--sp-4); }

/* ============================ TEST WINDOW ============================== */
/* The test window runs on paper, not on the dark app canvas. A candidate is
   reading a question paper, so this page — intro, exam and answer sheet —
   flips the semantic tokens to a light surface. Everything is scoped to
   body.exam-shell; no other page is affected. */

body.exam-shell { background: var(--canvas); color: var(--text); }

/* Exam-like chrome: a fixed status bar, the paper column, and a numbered
   palette rail. Structure follows the interface pattern; every colour, word
   and figure is ours. */

body.is-exam { --header-h: 0px; }
body.is-exam #site-header,
body.is-exam #site-footer,
body.is-exam #site-tabbar { display: none !important; }

/* --------------------------------- bar ---------------------------------- */

.exam-bar {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}

.exam-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding-block: 12px;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--sp-4);
}

.exam-identity {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.exam-brand {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 10px;
  background: var(--grad-brand);
  color: var(--text-invert);
}

.exam-brand svg { width: 17px; height: 17px; }

.exam-titles { display: grid; gap: 2px; min-width: 0; }

.exam-titles strong {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text-strong);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exam-titles span {
  font-size: var(--text-2xs);
  color: var(--text-subtle);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.exam-status {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.exam-save { font-size: var(--text-2xs); color: var(--text-subtle); }
.exam-save[data-tone="error"] { color: var(--danger-500); }

.exam-clock {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  background: var(--surface-sunken);
}

.exam-clock-label {
  font-size: var(--text-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.exam-clock-digits {
  display: inline-flex;
  align-items: baseline;
  gap: 1px;
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-variant-numeric: tabular-nums;
  color: var(--text-strong);
}

.exam-clock-digits i { font-style: normal; color: var(--text-subtle); }

.exam-clock.is-critical { border-color: var(--danger-500); }
.exam-clock.is-critical .exam-clock-digits { color: var(--danger-500); }

.exam-tool { white-space: nowrap; }

/* section strip */
.exam-subbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: var(--sp-3);
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--sp-4);
  border-top: 1px solid var(--border);
}

.exam-sections-label {
  font-size: var(--text-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-subtle);
  padding-right: 6px;
  white-space: nowrap;
}

.exam-sections {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-block: 6px;
}

.exam-sections::-webkit-scrollbar { display: none; }

.exam-tab {
  position: relative;
  padding: 11px 14px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  min-height: 44px;
}

.exam-tab span {
  margin-left: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--text-subtle);
}

.exam-tab:hover { color: var(--text-strong); }

.exam-tab[aria-selected="true"] {
  color: var(--text-invert);
  font-weight: 600;
  background: var(--violet-600);
}

.exam-tab[aria-selected="true"] span { color: var(--text-invert); }

.exam-sections-note {
  margin-left: auto;
  font-size: var(--text-2xs);
  color: var(--text-subtle);
  white-space: nowrap;
}

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

.exam-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: var(--sp-5);
  align-items: start;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding: 20px var(--sp-4) var(--sp-9);
}

.exam-paper { min-width: 0; display: grid; gap: var(--sp-4); }

/* passage + figure */
.exam-comprehension {
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  padding: 18px 20px;
}

.comprehension-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-3);
  margin-bottom: 10px;
}

.comprehension-head h2 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text-strong);
  text-transform: uppercase;
}

.comprehension-range { font-size: var(--text-2xs); color: var(--text-subtle); }

.comprehension-text {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 68ch;
  margin-bottom: 14px;
}

.qchart { margin: 0; }

.qchart svg { width: 100%; height: auto; display: block; max-width: 560px; }

.qchart-tick line { stroke: var(--border); stroke-width: 1; }
.qchart-tick text { fill: var(--text-subtle); font-size: 9px; font-family: var(--font-mono); }
.qchart-bar rect { fill: var(--violet-500); opacity: 0.85; }
.qchart-bar:hover rect { opacity: 1; }
.qchart-label { fill: var(--text-muted); font-size: 9px; }
.qchart-axis { stroke: var(--border-strong); stroke-width: 1; }

.qchart figcaption {
  margin-top: 6px;
  font-size: var(--text-2xs);
  color: var(--text-subtle);
}

/* question column */
.exam-question-col { display: grid; gap: var(--sp-4); min-width: 0; }

.qpanel-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-raised);
}

.qpanel-number {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-strong);
}

.q-meta-marks,
.q-meta-time {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.q-meta-marks b.pos { color: var(--success-500); }
.q-meta-marks b.neg { color: var(--danger-500); }
.q-meta-time b { font-family: var(--font-mono); color: var(--text); font-weight: 500; }

.q-meta-label {
  font-size: var(--text-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.q-report {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  padding: 4px 10px;
  border-radius: var(--r-sm);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.q-report svg { width: 14px; height: 14px; }
.q-report:hover { color: var(--text-strong); background: var(--surface-soft); }
.q-report.is-reported { color: var(--amber-500); border: 1px solid currentColor; }

/* question card */
.qpanel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: clamp(18px, 2.6vw, 30px);
  scroll-margin-top: 140px;
  outline: none;
  box-shadow: var(--shadow-sm);
}

.qpanel:focus-visible { outline: 2px solid var(--violet-500); outline-offset: 2px; }

.qpanel-label {
  font-size: var(--text-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-subtle);
  margin-bottom: 8px;
}

.qpanel-text {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--text);
  margin-bottom: var(--sp-2);
  max-width: 68ch;
}

/* Says whether one option or several apply. Quiet enough to sit above the
   options without competing with the question itself. */
.qpanel-instruction {
  font-size: var(--text-sm);
  color: var(--text-subtle);
  margin-bottom: var(--sp-4);
}

.qpanel-options { display: grid; gap: 9px; }

.qoption {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  padding: 12px 15px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  background: var(--surface-soft);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.qoption:hover { border-color: var(--violet-500); background: var(--surface-raised); }

.qoption input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.qoption-key {
  width: 26px;
  height: 26px;
  border: 1px solid var(--border-input);
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.qoption-key::after {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: transparent;
  transition: background var(--dur-fast) var(--ease);
}

.qoption-text { font-size: var(--text-base); color: var(--text); line-height: 1.5; }

.qoption.is-selected {
  border-color: var(--violet-600);
  background: color-mix(in srgb, var(--violet-600) 10%, var(--paper));
}

.qoption.is-selected .qoption-key { border-color: var(--violet-600); }
.qoption.is-selected .qoption-key::after { background: var(--violet-600); }

.qoption:focus-within {
  outline: 2px solid var(--violet-400);
  outline-offset: 2px;
}

.qoption:has(input:focus-visible) {
  outline: 2px solid var(--violet-400);
  outline-offset: 2px;
}

.qpanel-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-top: var(--sp-5);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border);
  font-size: var(--text-2xs);
  color: var(--text-subtle);
}

.qpanel-state { display: inline-flex; align-items: center; gap: 6px; }
.qpanel-state svg { width: 13px; height: 13px; }
.qpanel-state.is-answered { color: var(--success-500); }
.qpanel-state.is-marked { color: var(--amber-500); }
.qpanel-hint { color: var(--text-subtle); }

/* action bar */
.exam-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  flex-wrap: wrap;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface-raised);
}

.exam-actions-left,
.exam-actions-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.exam-actions .btn svg { width: 14px; height: 14px; }

/* ------------------------- read-only paper & summary --------------------- */

.paper-list { display: grid; gap: 6px; max-height: 56vh; overflow: auto; }

.paper-row {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto;
  gap: 10px;
  align-items: baseline;
  text-align: left;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-xs);
  min-height: 40px;
}

.paper-row:hover { background: var(--surface-soft); border-color: var(--border); }
.paper-row:focus-visible { outline: 2px solid var(--violet-400); outline-offset: 2px; }

.paper-row-no { font-size: var(--text-xs); color: var(--text-subtle); font-family: var(--font-mono); }

.paper-row-text {
  font-size: var(--text-sm);
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.paper-row-state { font-size: var(--text-2xs); color: var(--text-subtle); text-transform: capitalize; }

.summary-table {
  width: 100%;
  border: 1px solid var(--border);
  font-size: var(--text-sm);
  margin-block: var(--sp-4);
  border-collapse: collapse;
}

.summary-table th,
.summary-table td {
  padding: 8px 10px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.summary-table thead th {
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-subtle);
  font-weight: 500;
}

.summary-table tbody tr:last-child th,
.summary-table tbody tr:last-child td { border-bottom: 0; }
.summary-table td { text-align: right; font-variant-numeric: tabular-nums; }

.summary-total {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.palette-groups { display: grid; gap: 10px; }

/* -------------------------------- palette -------------------------------- */

.exam-side { position: sticky; top: 108px; }

.palette-card {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.candidate-row { display: flex; align-items: center; gap: 10px; }

.candidate-info { display: grid; gap: 2px; min-width: 0; }
.candidate-info strong {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-strong);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.candidate-info .badge { justify-self: start; font-size: var(--text-2xs); }

.palette-legend {
  display: grid;
  gap: 6px;
  padding-block: 12px;
  border-block: 1px solid var(--border);
  font-size: var(--text-2xs);
  color: var(--text-muted);
}

.palette-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.palette-legend li b { margin-left: auto; font-family: var(--font-mono); color: var(--text); }

.palette-legend .lg {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  border-radius: 4px;
  border: 1px solid var(--pal-unvisited-edge);
  background: var(--pal-unvisited);
}

.palette-legend .lg.is-answered { background: var(--pal-answered); border-color: transparent; }
.palette-legend .lg.is-marked { background: var(--pal-marked); border-color: transparent; }
.palette-legend .lg.is-marked-answered {
  background: var(--pal-marked);
  border-color: transparent;
  box-shadow: inset 0 0 0 2px var(--pal-answered);
}
.palette-legend .lg.is-not-answered { background: var(--pal-not-answered); border-color: transparent; }

.palette-section-label {
  font-size: var(--text-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-subtle);
}

.palette-section-label b { color: var(--text-strong); font-weight: 600; }

.palette-progress { font-size: var(--text-2xs); color: var(--text-muted); margin-top: -8px; }

.palette-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 6px;
}

.pal-btn {
  display: grid;
  place-items: center;
  min-width: 32px;
  min-height: 32px;
  border-radius: var(--r-sm);
  border: 1px solid var(--pal-unvisited-edge);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--pal-unvisited-ink);
  background: var(--pal-unvisited);
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.pal-btn:hover { transform: translateY(-1px); }
.pal-btn:focus-visible { outline: 2px solid var(--text-strong); outline-offset: 2px; }

.pal-btn.is-answered { background: var(--pal-answered); color: var(--pal-answered-ink); border-color: transparent; }
.pal-btn.is-not-answered { background: var(--pal-not-answered); color: var(--pal-not-answered-ink); border-color: transparent; }
.pal-btn.is-marked { background: var(--pal-marked); color: var(--pal-marked-ink); border-color: transparent; }
.pal-btn.is-marked-answered {
  background: var(--pal-marked);
  color: var(--pal-marked-ink);
  border-color: transparent;
  box-shadow: inset 0 0 0 2px var(--pal-answered);
}

.pal-btn.is-current {
  box-shadow: 0 0 0 2px var(--canvas), 0 0 0 4px var(--text-strong);
}

.palette-foot {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.palette-foot .btn { font-size: var(--text-2xs); padding-inline: 8px; }

.palette-submit { grid-column: 1 / -1; }

/* The rail is the desktop submit; the action bar carries it on small screens. */
@media (min-width: 721px) {
  .exam-actions #submit-btn { display: none; }
}

/* ------------------------------- pause veil ------------------------------ */

.pause-veil {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: grid;
  place-items: center;
  padding: var(--sp-4);
  background: rgba(6, 6, 14, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.pause-veil[hidden] { display: none; }

body.is-paused .exam-bar,
body.is-paused .exam-layout { visibility: hidden; }

.pause-card {
  width: min(420px, 100%);
  display: grid;
  justify-items: center;
  gap: 12px;
  text-align: center;
  padding: 32px 26px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-xl);
  background: var(--surface-raised);
  box-shadow: var(--shadow-xl);
}

.pause-mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--amber-500) 18%, transparent);
  color: var(--amber-500);
}

.pause-mark svg { width: 22px; height: 22px; }

.pause-card h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-strong);
}

.pause-card p { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.6; max-width: 34ch; }

/* ------------------------------ instructions ----------------------------- */

.instruction-list {
  display: grid;
  gap: 10px;
  padding-left: 20px;
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--text-muted);
  list-style: decimal;
}

.instruction-list li::marker { color: var(--violet-400); font-family: var(--font-mono); }

/* ============================== RESULT ================================= */

.result-shell { padding-block: var(--sp-8) var(--sp-10); }

.result-sheet { display: grid; gap: var(--sp-6); }

.result-head { border-bottom: 1px solid var(--border); padding-bottom: var(--sp-5); }
.result-head :is(h1, h2) { font-size: clamp(1.5rem, 1.2rem + 1.2vw, var(--text-2xl)); margin-block: 6px var(--sp-2); line-height: 1.2; }
.result-head p { color: var(--text-muted); font-size: var(--text-sm); }

.result-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  flex-wrap: wrap;
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-6);
}

.result-score { display: flex; align-items: baseline; gap: 10px; }

.result-score strong {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 2rem + 2.4vw, 3.6rem);
  font-weight: 600;
  line-height: 1;
  color: var(--text-strong);
}

.result-score span { font-size: var(--text-sm); color: var(--text-subtle); }

.result-hero-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(100px, auto));
  gap: var(--sp-5);
}

.result-hero-meta span { display: block; font-size: var(--text-2xs); letter-spacing: var(--tracking-wide); text-transform: uppercase; color: var(--text-subtle); }
.result-hero-meta b { font-size: var(--text-md); font-weight: 600; color: var(--text-strong); }

.result-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.result-stat { padding: var(--sp-4) 0; display: grid; gap: 2px; }
.result-stat + .result-stat { border-left: 1px solid var(--border); padding-left: var(--sp-5); }
.result-stat strong { font-family: var(--font-display); font-size: var(--text-xl); font-weight: 600; color: var(--text-strong); }
.result-stat span { font-size: var(--text-xs); color: var(--text-subtle); }
.result-stat.ok strong { color: var(--success-600); }
.result-stat.no strong { color: var(--danger-600); }

.result-section { display: grid; gap: var(--sp-3); }
.result-section > h2,
.review-head h2 { font-size: var(--text-md); }

.section-table { display: grid; gap: var(--sp-3); }
.section-row { display: grid; gap: 6px; }

.section-row-head {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  font-size: var(--text-xs);
  color: var(--text-subtle);
  margin-bottom: 6px;
}

.section-row-head strong { font-size: var(--text-sm); color: var(--text-strong); font-weight: 600; }
.section-row-head span { margin-left: auto; }
.section-row-head b { color: var(--text-strong); font-variant-numeric: tabular-nums; }

.section-track {
  height: 6px;
  border-radius: 999px;
  background: var(--slate-100);
  overflow: hidden;
}

.section-track i { display: block; height: 100%; background: var(--ink-900); border-radius: inherit; }

.review-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-4);
  flex-wrap: wrap;
  margin-bottom: var(--sp-3);
}

.review-filter { display: flex; gap: 6px; flex-wrap: wrap; }

.solutions { display: grid; gap: var(--sp-4); }

.solution {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--sp-5);
}

.solution-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--sp-3);
}

.solution-number { font-family: var(--font-display); font-weight: 600; color: var(--text-strong); }
.solution-section { font-size: var(--text-xs); color: var(--text-subtle); }

.solution-mark {
  margin-left: auto;
  font-size: var(--text-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--r-xs);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.solution-mark.ok { color: var(--success-600); border-color: var(--success-200); background: var(--success-100); }
.solution-mark.no { color: var(--danger-600); border-color: var(--danger-200); background: var(--danger-100); }
.solution-mark.skip { color: var(--text-subtle); }

.solution-text { font-size: var(--text-base); line-height: 1.6; color: var(--text); margin-bottom: var(--sp-3); }

.solution-options { display: grid; gap: 6px; }

.solution-opt {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-xs);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.solution-opt em { margin-left: auto; font-style: normal; font-size: var(--text-2xs); letter-spacing: 0.04em; text-transform: uppercase; }

.solution-key {
  width: 20px; height: 20px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 10px;
  flex: 0 0 auto;
}

.solution-opt.is-correct { border-color: var(--success-200); background: var(--success-100); color: var(--success-600); }
.solution-opt.is-correct .solution-key { border-color: var(--success-200); }
.solution-opt.is-wrong { border-color: var(--danger-200); background: var(--danger-100); color: var(--danger-600); }

.solution-explanation {
  margin-top: var(--sp-3);
  padding-top: var(--sp-3);
  border-top: 1px solid var(--border);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-muted);
}

.solution-explanation strong { color: var(--text-strong); font-weight: 600; }

.result-note {
  display: flex;
  gap: 8px;
  align-items: flex-start;
  padding: var(--sp-3) var(--sp-4);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber-600);
  background: var(--amber-100);
  font-size: var(--text-sm);
  color: var(--amber-800);
}

.result-note svg { width: 16px; height: 16px; flex: 0 0 auto; margin-top: 2px; }

.result-actions {
  display: flex;
  gap: var(--sp-3);
  flex-wrap: wrap;
  justify-content: space-between;
  padding-top: var(--sp-5);
  border-top: 1px solid var(--border);
}

/* ============================ RESPONSIVE =============================== */

/* Wide screens read the passage and its question side by side, the way a
   printed comprehension set is laid out. */
@media (min-width: 980px) {
  .exam-paper { grid-template-columns: minmax(0, 1fr); }
  body.has-passage .exam-paper { grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); }
}

@media (max-width: 1080px) {
  .exam-layout { grid-template-columns: minmax(0, 1fr); }
  .exam-side { position: static; }
  .palette-grid { grid-template-columns: repeat(10, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .intro-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .result-hero-meta { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .result-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .result-stat:nth-child(3) { border-left: 0; padding-left: 0; }
  .result-stat:nth-child(n + 3) { border-top: 1px solid var(--border); }
}

@media (max-width: 720px) {
  .exam-bar-inner { flex-wrap: wrap; padding-block: 10px; }
  .exam-identity { width: 100%; }
  .exam-status { width: 100%; justify-content: space-between; }
  .exam-save { display: none; }
  .exam-clock { flex: 1 1 auto; justify-content: center; }
  .exam-tool { flex: 0 0 auto; }

  .exam-subbar { padding-inline: 0; }
  .exam-sections-note { display: none; }
  .exam-sections-label { display: none; }
  .exam-tab { padding-inline: 12px; }

  .exam-layout { padding: 14px var(--sp-3) var(--sp-8); gap: var(--sp-3); }
  .qpanel { padding: 16px; }
  .qpanel-meta { padding: 8px 12px; gap: 8px 12px; }
  .qpanel-number { flex: 1 1 auto; }
  .q-report { margin-left: 0; }
  .qpanel-text { font-size: var(--text-base); }
  .qpanel-hint { display: none; }

  /* the phone layout from the reference: stacked, thumb-reachable actions */
  .exam-actions { position: sticky; bottom: 0; z-index: var(--z-sticky); }
  .exam-actions-left,
  .exam-actions-right { width: 100%; }
  .exam-actions-left .btn,
  .exam-actions-right .btn { flex: 1 1 auto; }
  .exam-actions-right #submit-btn { flex-basis: 100%; }

  .palette-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .pal-btn { min-height: 40px; }

  .result-actions .btn { flex: 1 1 auto; }
  .review-head { align-items: flex-start; }
}

@media (max-width: 480px) {
  /* Keep the status bar to one compact row pair on small phones. */
  .exam-brand { display: none; }
  .exam-titles span { display: none; }
  .exam-identity { width: auto; flex: 1 1 auto; }
  .exam-status { width: auto; gap: 6px; }
  .exam-clock { padding: 5px 9px; }
  .exam-clock-label { display: none; }
  .exam-tool { font-size: var(--text-2xs); padding-inline: 10px; }
  .qpanel-number { font-size: var(--text-xs); }
  .q-meta-label { display: none; }
  .palette-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

/* ================================ PRINT ================================ */

@media print {
  :root {
    --canvas: #ffffff;
    --paper: #ffffff;
    --surface: #ffffff;
    --surface-soft: #ffffff;
    --surface-raised: #ffffff;
    --text-strong: #111111;
    --text: #222222;
    --text-muted: #333333;
    --text-subtle: #444444;
    --border: #cccccc;
    --border-strong: #bbbbbb;
  }

  body.exam-shell { background: #fff; color: #111; }
  .qoption { background: #fff; }
  .qoption.is-selected { background: #f3f3f3; }

  .exam-bar,
  .exam-side,
  .exam-actions,
  .qpanel-meta .q-report,
  .pause-veil,
  .result-actions,
  .review-filter,
  .toast-stack,
  .skip-link,
  .modal { display: none !important; }

  .intro-shell { padding: 0; }
  .intro-card { border: 0; padding: 0; }

  .exam-layout { display: block; padding: 0; }
  .exam-paper, .exam-question-col { display: block; }
  .qpanel { border: 0; padding: 0; }
  .exam-comprehension { border: 0; padding: 0; }
  .solution { break-inside: avoid; page-break-inside: avoid; }
  .result-hero { border: 0; padding: 0; }
  .result-sheet { gap: var(--sp-4); }

  a[href]::after { content: ""; }
}

/* Shared avatar size used by the candidate strip */
.avatar-sm { width: 26px; height: 26px; font-size: 10px; }

/* Wider dialog for the read-only question paper */
.modal-panel-lg { width: min(720px, 100%); }

/* A single submitted paper is a figure, not a trend line. */
.chart-single {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  padding: var(--sp-5) 0 var(--sp-4);
}

.chart-single-score {
  display: inline-block;
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text);
}

.chart-single-body { display: grid; gap: 4px; min-width: 0; }
.chart-single-body strong { font-size: var(--text-sm); }
.chart-single-body small { font-size: var(--text-xs); color: var(--text-subtle); max-width: 46ch; }

@media (max-width: 560px) {
  .chart-single { flex-direction: column; align-items: flex-start; gap: var(--sp-2); }
  .chart-single-score { font-size: 34px; }
}

/* ---------------------------------------------------------------- */
/* PDF reader                                                        */
/* ---------------------------------------------------------------- */

.reader-shell {
  padding-bottom: 24px;
}

.reader-sub {
  margin: 2px 0 12px;
}

.reader-frame-wrap {
  position: relative;
  min-height: 70vh;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: #0b0b16;
  overflow: hidden;
}

.reader-frame {
  display: block;
  width: 100%;
  height: 74vh;
  border: 0;
  background: #ffffff;
}

.reader-frame[hidden] {
  display: none;
}

.reader-fallback {
  display: grid;
  gap: 10px;
  place-items: center;
  text-align: center;
  padding: 48px 22px;
  max-width: 46ch;
  margin: 0 auto;
}

.reader-fallback[hidden] {
  display: none;
}

.reader-fallback p {
  color: var(--text-muted);
}

@media (max-width: 767px) {
  .reader-frame {
    height: 68vh;
  }

  .reader-frame-wrap {
    min-height: 64vh;
    border-radius: var(--r-md);
  }
}