/* Blue Book — exam blue-book identity.
   Field: washed cover blue. Cards: paper. Ink: blue-black. Interaction: ballpoint blue.
   The one loud element is the grading stamp on the results slip. */

:root {
  --field: #d9e1eb;
  --field-deep: #c9d4e2;
  --paper: #f9f7f1;
  --ink: #1e2a38;
  --ink-soft: #55637a;
  --pen: #2d5b9e;
  --pen-deep: #234a84;
  --red: #b23527;
  --green: #2f6b4f;
  --rule: rgba(30, 42, 56, 0.16);
  --rule-strong: rgba(30, 42, 56, 0.32);
  --shadow: 0 1px 2px rgba(30, 42, 56, 0.10), 0 8px 24px rgba(30, 42, 56, 0.10);
  --serif: "Iowan Old Style", "Palatino Nova", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background:
    linear-gradient(160deg, var(--field) 0%, var(--field-deep) 100%);
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(30, 42, 56, 0.07);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  max-width: 760px;
  margin: 0 auto;
  padding: 26px 20px 10px;
  border-bottom: 2px solid var(--rule-strong);
}

.masthead-brand {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.masthead-note {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

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

#app {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

.colophon {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 36px;
  font-size: 12.5px;
  color: var(--ink-soft);
}

.paper {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 26px 28px;
}

.section-head {
  font-family: var(--serif);
  font-size: 21px;
  margin: 34px 0 14px;
}

/* ---------- home / ledger ---------- */

.cover-head h1 {
  font-family: var(--serif);
  font-size: 40px;
  line-height: 1.1;
  margin: 6px 0 8px;
}

.cover-sub {
  margin: 0 0 26px;
  max-width: 52ch;
  color: var(--ink-soft);
}

.ledger { border-top: 1px solid var(--rule-strong); }

.ledger-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 16px 4px;
  border: 0;
  border-bottom: 1px solid var(--rule);
  background: none;
  font: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
}

.ledger-row:hover .ledger-title,
.ledger-row:focus-visible .ledger-title {
  color: var(--pen);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.ledger-title {
  font-family: var(--serif);
  font-size: 21px;
  margin: 0 0 2px;
}

.ledger-desc {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 54ch;
}

.ledger-meta {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.empty {
  margin-top: 26px;
  color: var(--ink-soft);
  line-height: 2;
}

/* ---------- quiz ---------- */

.quiz-head { margin-bottom: 18px; }

.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}

.quiz-title-small {
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 700;
}

.quiz-progress {
  font-size: 13px;
  color: var(--ink-soft);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.progress-rule {
  height: 3px;
  background: rgba(30, 42, 56, 0.14);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: var(--pen);
  transition: width 0.25s ease;
}

.q-kind {
  margin: 0 0 6px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.q-text {
  font-family: var(--serif);
  font-size: 24px;
  line-height: 1.35;
  margin: 0 0 20px;
}

.choices { display: grid; gap: 10px; }

.choice {
  display: flex;
  gap: 12px;
  align-items: baseline;
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--rule);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.55);
  font: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
  transition: border-color 0.12s ease, background 0.12s ease;
}

.choice:hover { border-color: var(--pen); }

.choice[aria-pressed="true"] {
  border-color: var(--pen);
  background: rgba(45, 91, 158, 0.10);
  box-shadow: inset 0 0 0 1px var(--pen);
}

.choice-letter {
  flex-shrink: 0;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--pen);
  width: 1.4em;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

.btn-ink {
  background: var(--pen);
  border: 1.5px solid var(--pen-deep);
  color: #fff;
}

.btn-ink:hover { background: var(--pen-deep); }

.btn-quiet {
  background: transparent;
  border: 1.5px solid var(--rule-strong);
  color: var(--ink);
}

.btn-quiet:hover { border-color: var(--ink); }

.btn:disabled { opacity: 0.45; cursor: default; }

:focus-visible {
  outline: 2.5px solid var(--pen);
  outline-offset: 2px;
}

.quiz-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
}

.key-hint {
  margin-top: 14px;
  font-size: 12px;
  color: var(--ink-soft);
}

/* ---------- results / grade slip ---------- */

.grade-slip { border-left: 5px solid var(--pen); }

.slip-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.slip-label {
  margin: 0 0 2px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.slip-score {
  font-family: var(--serif);
  font-size: 58px;
  line-height: 1;
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.slip-pct {
  font-size: 22px;
  color: var(--ink-soft);
  margin-left: 12px;
}

.slip-passline {
  margin: 8px 0 0;
  font-size: 13.5px;
  color: var(--ink-soft);
}

/* the signature: a rubber stamp, thumped onto the slip */
.stamp {
  font-family: var(--sans);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 10px 18px;
  border: 3px double currentColor;
  border-radius: 4px;
  transform: rotate(-6deg);
  white-space: nowrap;
}

.stamp.pass { color: var(--green); }
.stamp.fail { color: var(--red); }

@media (prefers-reduced-motion: no-preference) {
  .stamp {
    animation: stamp-in 0.45s cubic-bezier(0.2, 1.6, 0.4, 1) both;
    animation-delay: 0.25s;
  }
  @keyframes stamp-in {
    0% { opacity: 0; transform: rotate(-14deg) scale(2.1); }
    100% { opacity: 1; transform: rotate(-6deg) scale(1); }
  }
}

/* missed questions — red margin rule, like corrections */
.missed-item {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--red);
  border-radius: 6px;
  box-shadow: var(--shadow);
  padding: 18px 22px;
  margin-bottom: 12px;
}

.missed-q {
  font-family: var(--serif);
  font-size: 18px;
  margin: 0 0 10px;
}

.missed-item dl { margin: 0; display: grid; gap: 6px; }

.missed-item dt {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.missed-item dd { margin: 0 0 4px; font-size: 15px; }

.missed-yours { color: var(--red); }
.missed-correct { color: var(--green); font-weight: 600; }

.none-missed {
  color: var(--green);
  font-weight: 600;
}

/* ---------- packet ---------- */

.packet { margin-top: 34px; }

.packet-head { margin: 0 0 8px; }

.packet-note {
  margin: 0 0 16px;
  font-size: 14.5px;
  color: var(--ink-soft);
  max-width: 60ch;
}

.packet-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.copy-status {
  font-size: 14px;
  font-weight: 600;
  color: var(--green);
}

.packet-preview { margin-top: 16px; }

.packet-preview summary {
  cursor: pointer;
  font-size: 14px;
  color: var(--pen);
  font-weight: 600;
}

.packet-preview pre {
  margin-top: 10px;
  max-height: 340px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  background: rgba(30, 42, 56, 0.05);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}

.results-nav { margin-top: 26px; }

.error-msg { color: var(--red); }

/* ---------- small screens ---------- */

@media (max-width: 560px) {
  .paper { padding: 20px 18px; }
  .cover-head h1 { font-size: 32px; }
  .q-text { font-size: 20px; }
  .slip-score { font-size: 44px; }
  .stamp { font-size: 16px; }
  .ledger-row { flex-direction: column; gap: 4px; }
  .masthead { flex-direction: column; gap: 2px; }
}