:root {
  --paper: #f3ecdf;
  --paper-deep: #e7dccb;
  --sheet: #fbf7f0;
  --ink: #1d1a16;
  --muted: #645c52;
  --line: #ddcfb8;
  --stamp: #9d2c1a;
  --stamp-ink: #f8f1e6;
  --good: #1c6b43;
  --good-bg: #e4f2ea;
  --bad: #9d2c1a;
  --bad-bg: #f8e7e2;
  --select: #f4e3c6;
  --select-line: #8d6230;
  --blue: #1a4f86;
  --shadow: 0 1px 0 rgba(48, 32, 12, 0.04);
  --sans: "Avenir Next", "Segoe UI", sans-serif;
  --serif: "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 400px at 10% -10%, rgba(157, 44, 26, 0.06), transparent 50%),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.5;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--ink);
  color: var(--sheet);
  padding: 6px 10px;
  z-index: 5;
}

.skip:focus { top: 8px; }

.noscript {
  margin: 24px;
}

.page {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding-bottom: 64px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.stamp {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: var(--stamp);
  color: var(--stamp-ink);
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.02em;
  border-radius: 3px;
}

.brand-name {
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.1;
}

.brand-name small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav a, .text-btn, .btn {
  font: inherit;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 10px;
  border-bottom: 2px solid transparent;
}

.nav a[aria-current="page"] {
  color: var(--ink);
  border-color: var(--stamp);
}

.timer {
  font-family: var(--mono);
  font-size: 0.95rem;
  padding: 4px 8px;
  border: 1px solid var(--line);
  background: var(--sheet);
}

.timer.urgent {
  color: var(--stamp);
  border-color: var(--stamp);
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; letter-spacing: -0.01em; }

h1 { font-size: 2.4rem; line-height: 1.15; margin: 0 0 8px; }

.lede {
  max-width: 62ch;
  margin: 0 0 22px;
  color: var(--muted);
  font-size: 1.05rem;
}

.exam-switch {
  display: flex;
  gap: 18px;
  margin-bottom: 18px;
}

.exam-switch a {
  color: var(--muted);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.35rem;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.exam-switch a[aria-current="page"] {
  color: var(--ink);
  border-color: var(--ink);
}

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

.btn, .text-btn {
  display: inline-block;
  border: 1px solid var(--line);
  background: var(--sheet);
  color: var(--ink);
  border-radius: 4px;
  padding: 8px 12px;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.search-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 18px 0 4px;
  color: var(--muted);
  font-size: 0.92rem;
}

.btn.primary {
  background: var(--ink);
  color: var(--sheet);
  border-color: var(--ink);
}

.btn.danger {
  color: var(--stamp);
}

.btn:disabled, .text-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  color: var(--muted);
  font-size: 0.92rem;
  margin: 8px 0 18px;
}

.callout {
  background: var(--sheet);
  border: 1px solid var(--line);
  border-left: 3px solid var(--stamp);
  padding: 12px 14px;
  margin: 0 0 22px;
}

.callout a { color: var(--blue); }

.topic-block { margin: 26px 0 8px; }

.topic-block h2 {
  font-size: 1.25rem;
  margin: 0;
}

.topic-kicker {
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 2px;
}

.search {
  width: min(420px, 100%);
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--sheet);
  color: var(--ink);
}

.topic-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 47px 4.25rem 4.25rem 4.6rem;
  gap: 12px;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}

.legend-row {
  border-bottom: none;
  padding: 14px 0 0;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
}

.legend-spacer {
  visibility: hidden;
  pointer-events: none;
}

.topic-row a {
  color: inherit;
  text-decoration: none;
  min-width: 0;
}

.topic-row a:hover .otitle { text-decoration: underline; }

.oid {
  display: inline-block;
  min-width: 3.4rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}

.otitle { font-size: 1rem; }

.dots { display: inline-flex; gap: 3px; }

.dots i {
  width: 7px;
  height: 7px;
  border-radius: 1px;
  background: var(--paper-deep);
  display: block;
}

.dots i.on { background: var(--stamp); }

.ostat {
  min-width: 3.4rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-size: 0.92rem;
}

.ostat.latest { color: var(--ink); }

.sheet {
  background: var(--sheet);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 22px 22px 18px;
  box-shadow: var(--shadow);
}

.reading { width: min(740px, 100%); }

.kicker {
  color: var(--stamp);
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}

.notes { padding-left: 1.1rem; margin: 12px 0; }

.notes li { margin: 8px 0; }

.terms { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 18px; }

.terms span, code {
  font-family: var(--mono);
  font-size: 0.86rem;
}

.terms span {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 2px 7px;
  border-radius: 99px;
}

code {
  background: #efe4d2;
  padding: 0.05em 0.35em;
  border-radius: 4px;
}

.prompt {
  font-family: var(--serif);
  font-size: 1.45rem;
  line-height: 1.35;
  margin: 8px 0 16px;
}

.q-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.choices { display: grid; gap: 8px; margin: 12px 0; }

.choice {
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 10px 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  cursor: pointer;
}

.choice .mark {
  font-family: var(--mono);
  color: var(--muted);
  min-width: 1.2rem;
}

.choice[aria-pressed="true"] {
  background: var(--select);
  border-color: var(--select-line);
}

.choice.is-correct {
  background: var(--good-bg);
  border-color: var(--good);
}

.choice.is-wrong {
  background: var(--bad-bg);
  border-color: var(--bad);
}

.choice:disabled { cursor: default; }

.blank {
  width: min(520px, 100%);
  font: inherit;
  font-family: var(--mono);
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: white;
  color: var(--ink);
}

.feedback {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 4px;
  border: 1px solid var(--line);
}

.feedback.good { background: var(--good-bg); border-color: #b7d7c4; }
.feedback.bad { background: var(--bad-bg); border-color: #ecc4bb; }

.feedback h3 { margin: 0 0 6px; font-size: 1.15rem; }

.keys {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 16px;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(10, minmax(0, 1fr));
  gap: 6px;
  margin-top: 18px;
}

.nav-grid button {
  font: inherit;
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 4px;
  padding: 6px 0;
  cursor: pointer;
}

.nav-grid button.answered { background: var(--paper-deep); }
.nav-grid button.current { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.nav-grid button.flagged { color: var(--stamp); }
.nav-grid button.right { background: var(--good-bg); border-color: var(--good); }
.nav-grid button.wrong { background: var(--bad-bg); border-color: var(--bad); }

.score {
  font-family: var(--serif);
  font-size: 3rem;
  line-height: 1;
  margin: 8px 0;
}

.score span { font-size: 1.2rem; color: var(--muted); }

.bars { margin-top: 12px; }

.bar-row {
  display: grid;
  grid-template-columns: 4.2rem minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  margin: 7px 0;
  font-size: 0.92rem;
}

.track {
  height: 8px;
  background: var(--paper-deep);
  border-radius: 99px;
  overflow: hidden;
}

.track span {
  display: block;
  height: 100%;
  background: var(--good);
}

.track.weak span { background: var(--stamp); }

.fine {
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 68ch;
}

.footer-note {
  margin-top: 36px;
  color: var(--muted);
  font-size: 0.82rem;
  max-width: 70ch;
}

.footer-note a { color: var(--blue); }

.split {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.filter-row { display: flex; gap: 8px; margin: 8px 0 14px; }

.filter-row button[aria-pressed="true"] {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--sheet);
}

.mock-list { list-style: none; padding: 0; margin: 0; }

.mock-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}

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

@media (max-width: 720px) {
  h1 { font-size: 2rem; }
  .prompt { font-size: 1.25rem; }
  .topic-row { grid-template-columns: minmax(0, 1fr) 3.5rem 3.5rem 4.2rem; }
  .dots { display: none; }
  .nav-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .site-header { align-items: flex-start; flex-direction: column; }
}

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

@media print {
  body { background: white; }
  .site-header, .actions, .keys, .no-print { display: none !important; }
  .sheet { border: none; box-shadow: none; padding: 0; }
}