:root {
  --paper: #f3eee4;
  --paper-2: #e9e1d2;
  --ink: #1c2430;
  --ink-2: #3a4452;
  --mute: #6b6258;
  --rule: #d7ccba;
  --rust: #c45c2a;
  --rust-2: #9a4018;
  --moss: #2f6b4f;
  --moss-2: #d7ebe0;
  --wine: #8b2e2e;
  --wine-2: #f3d6d2;
  --gold: #c9a227;
  --card: #fffaf2;
  --shadow: 0 18px 40px rgba(28, 36, 48, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Times New Roman", serif;
  --sans: "Segoe UI", "Helvetica Neue", system-ui, sans-serif;
  --mono: "Cascadia Code", "IBM Plex Mono", ui-monospace, monospace;
  --rail: 272px;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #fff8ec 0%, transparent 55%),
    linear-gradient(180deg, #ebe4d6, var(--paper));
  line-height: 1.5;
}
button, input, select { font: inherit; color: inherit; }
a { color: var(--rust-2); }
.skip {
  position: absolute; left: -999px; top: 8px;
}
.skip:focus { left: 8px; background: #fff; padding: 8px 12px; z-index: 9; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.shell {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  min-height: 100vh;
}
.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px 22px 24px;
  border-right: 1px solid var(--rule);
  background: rgba(243, 238, 228, 0.88);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  color: var(--ink);
}
.brand strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: 0.01em;
}
.brand em {
  display: block;
  font-style: normal;
  font-size: 0.78rem;
  color: var(--mute);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav { display: flex; flex-direction: column; gap: 4px; }
.nav a {
  text-decoration: none;
  color: var(--ink-2);
  padding: 8px 10px;
  border-radius: 8px;
}
.nav-n {
  display: inline-block;
  width: 1.6rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--mute);
}
.nav a.active .nav-n { color: var(--rust); }
.nav a:hover, .nav a.active {
  background: #fff;
  color: var(--ink);
}
.nav a.active { box-shadow: inset 3px 0 0 var(--rust); font-weight: 600; }
.search input {
  width: 100%;
  border: 1px solid var(--rule);
  background: var(--card);
  border-radius: 8px;
  padding: 9px 10px;
}
.rail-progress { font-size: 0.82rem; color: var(--ink-2); }
.rail-progress .bar {
  height: 8px;
  background: var(--paper-2);
  border-radius: 99px;
  overflow: hidden;
  margin: 6px 0 10px;
}
.rail-progress .bar > span {
  display: block;
  height: 100%;
  background: var(--rust);
}
.rail-note {
  margin-top: auto;
  font-size: 0.75rem;
  color: var(--mute);
  line-height: 1.4;
}
.stage {
  padding: 36px 40px 72px;
  max-width: 1080px;
}

.kicker {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
  margin: 0 0 8px;
}
h1, h2, h3, h4 { font-family: var(--serif); line-height: 1.2; margin: 0 0 12px; }
h1 { font-size: clamp(2rem, 4vw, 3.1rem); font-weight: 650; }
h2 { font-size: 1.55rem; }
h3 { font-size: 1.18rem; }
.lede { font-size: 1.12rem; color: var(--ink-2); max-width: 46rem; }
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 28px;
}
.chip {
  border: 1px solid var(--rule);
  background: var(--card);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.82rem;
}
.chip.rust { border-color: #e3b496; background: #f8e6d8; }
.grid {
  display: grid;
  gap: 14px;
}
.grid.four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid.two { grid-template-columns: 1fr 1fr; }
.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
}
.card h3 { margin-bottom: 6px; }
.weight {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--rust-2);
}
.domain-bar {
  height: 10px;
  background: var(--paper-2);
  border-radius: 99px;
  overflow: hidden;
  margin: 10px 0 6px;
}
.domain-bar > span { display: block; height: 100%; }
.muted { color: var(--mute); }
.small { font-size: 0.88rem; }

.list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.list li { margin: 0; }
.skill-group { margin: 0 0 22px; }
.skill-block {
  border-bottom: 1px dashed var(--rule);
  padding: 4px 0 8px;
}
.skill-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 7px 0 2px;
}
.skill-item input { margin-top: 4px; accent-color: var(--rust); }
.lab-toggle {
  margin: 0 0 4px 28px;
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 2px 10px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--rust-2);
  cursor: pointer;
}
.lab-toggle[aria-expanded="true"] { background: #f8e6d8; border-color: #e3b496; }
.lab {
  margin: 6px 0 8px 28px;
  padding: 10px 12px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 10px;
  font-size: 0.92rem;
}
.lab p { margin: 0 0 6px; }
.lab ol { margin: 0 0 8px; padding-left: 1.2rem; }
.lab li { margin: 0 0 6px; }
.lab-check { color: var(--ink-2); }
.trace-hit { padding: 12px 0; border-bottom: 1px dashed var(--rule); }
.trace-hit:last-child { border-bottom: 0; padding-bottom: 0; }
.trace-hit h3 { margin: 0 0 6px; font-size: 1.02rem; }
.trace-answer p { margin: 0 0 4px; }
.toc a.here { color: var(--rust-2); font-weight: 650; }
.pair-name {
  margin: 0;
  padding: 10px 0;
  border-bottom: 1px dashed var(--rule);
  font-weight: 650;
}
.pair-name:last-child { border-bottom: 0; padding-bottom: 0; }
.group-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
  margin-bottom: 6px;
}
.pct { font-family: var(--mono); font-size: 0.8rem; color: var(--mute); }

.note-body h3 { margin-top: 22px; }
.note-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 10px 0 16px;
}
.note-body th, .note-body td {
  border-bottom: 1px solid var(--rule);
  text-align: left;
  padding: 7px 8px;
  vertical-align: top;
}
.note-body th { font-size: 0.75rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--mute); font-weight: 650; }
.trap {
  background: #f8e6d8;
  border-left: 4px solid var(--rust);
  padding: 12px 14px;
  margin: 14px 0;
}
.trap strong { display: block; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px; }
.ok {
  background: var(--moss-2);
  border-left: 4px solid var(--moss);
  padding: 12px 14px;
  margin: 14px 0;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 18px;
}
.btn {
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fffaf2;
  border-radius: 9px;
  padding: 8px 12px;
  cursor: pointer;
}
.btn.ghost {
  background: transparent;
  color: var(--ink);
}
.btn.ghost:hover { background: #fff; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn.on {
  background: #fff;
  box-shadow: inset 0 0 0 2px var(--ink);
}
.file-btn { display: inline-flex; align-items: center; cursor: pointer; }
.next-up p { margin: 0; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.cov {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  margin-top: 10px;
}
.cov-cell {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: baseline;
  text-decoration: none;
  color: var(--ink);
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 0.86rem;
}
.cov-cell b { font-family: var(--mono); font-size: 0.78rem; color: var(--mute); }
.cov-cell.ok { background: var(--moss-2); border-color: #9ccbb4; }
.cov-cell.cold { background: #fff; }
.cov-cell:hover { border-color: var(--ink); }
button.cov-cell {
  font: inherit;
  text-align: left;
  cursor: pointer;
  width: 100%;
}
.scores { list-style: none; padding: 0; margin: 0; }
.scores li { padding: 6px 0; border-bottom: 1px dashed var(--rule); }
.choice .key {
  display: inline-block;
  min-width: 1.2em;
  margin-right: 6px;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--mute);
}

.flash {
  min-height: 260px;
  display: grid;
  place-items: center;
  text-align: center;
  cursor: pointer;
  user-select: none;
}
.flash .face { max-width: 36rem; }
.flash .back { font-size: 1.05rem; }
.choice {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 8px 0;
  cursor: pointer;
}
.choice:hover { border-color: var(--ink); }
.choice.picked { border-color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.choice.right { background: var(--moss-2); border-color: var(--moss); }
.choice.wrong { background: var(--wine-2); border-color: var(--wine); }
.explain { margin-top: 14px; }
.score { font-family: var(--serif); font-size: 2rem; }
.exam-clock {
  font-family: var(--mono);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}
.exam-clock.low { color: var(--wine); font-weight: 700; }
.qnav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 8px 0 16px;
}
.qnav-i {
  width: 2rem;
  height: 2rem;
  border: 1px solid var(--rule);
  background: var(--card);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0;
}
.qnav-i.answered { background: var(--paper-2); }
.qnav-i.flagged { box-shadow: inset 0 -3px 0 var(--gold); }
.qnav-i.current { border-color: var(--ink); font-weight: 700; }
.qnav-i:hover { border-color: var(--ink); }
.report-hero { padding: 18px 20px; }
.report-hero.pass { border-left: 5px solid var(--moss); }
.report-hero.fail { border-left: 5px solid var(--wine); }
.domain-score { margin: 12px 0; }
.domain-score .row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.92rem;
}
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--mute);
  margin: 0 0 8px;
}
.legend i {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  border: 1px solid var(--rule);
  vertical-align: -2px;
  margin-right: 4px;
}
.legend i.answered { background: var(--paper-2); }
.legend i.flagged { box-shadow: inset 0 -3px 0 var(--gold); }
.legend i.current { border-color: var(--ink); }

.plan-hero .days {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  margin: 0 0 4px;
}
.week-card.now { border-color: var(--ink); box-shadow: var(--shadow); }
.week-card.done { background: var(--moss-2); }
.week-card.past { opacity: 0.82; }
.task {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 8px 0;
  border-bottom: 1px dashed var(--rule);
}
.task input { margin-top: 4px; accent-color: var(--rust); }
.task.done span, .task.done a { color: var(--mute); }
.week-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 0.82rem;
  color: var(--mute);
  margin: 0 0 10px;
}
.timeline { display: grid; gap: 12px; margin-top: 12px; }
.ready-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}
@media (max-width: 900px) {
  .ready-grid { grid-template-columns: 1fr 1fr; }
}

.search-hit {
  padding: 10px 0;
  border-bottom: 1px dashed var(--rule);
}
.search-hit a { text-decoration: none; color: var(--ink); font-weight: 650; }
.tag {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mute);
  margin-right: 8px;
}

.toc a {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}
.toc a:hover { color: var(--rust-2); }

footer.tiny { margin-top: 40px; color: var(--mute); font-size: 0.8rem; }

@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .stage { padding: 24px 18px 56px; }
  .grid.four, .grid.two { grid-template-columns: 1fr; }
  .lab, .lab-toggle { margin-left: 0; }
}

@media print {
  .rail, .toolbar, .search, .btn { display: none !important; }
  .shell { display: block; }
  .stage { max-width: none; padding: 0; }
  body { background: #fff; }
  .card { box-shadow: none; }
}