:root {
  --ink: #12181F;
  --paper: #FAFAFA;
  --signal-blue: #1E56E8;
  --caution-amber: #C97A2E;
  --data-slate: #5B6472;
  --line: #D8D3C8;
  --sans: "Inter", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.45;
}

.page {
  max-width: 26.5rem;
  margin: 0 auto;
  padding: 1.25rem 1.1rem 3rem;
}

.eyebrow,
.caption,
.meta-row,
.tier3,
.level-label,
.action-note {
  font-family: var(--sans);
  font-weight: 400;
  color: var(--data-slate);
}

.eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 1rem;
}

.card {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 1.1rem 1.1rem 1.25rem;
}

.card-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.nav-btn {
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 1.35rem;
  line-height: 1;
  cursor: pointer;
}

.caption {
  font-size: 0.75rem;
  margin: 0;
}

.meta-row {
  font-size: 0.8rem;
  margin: 0 0 0.55rem;
}

.checkpoint {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 2.15rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  color: var(--ink);
}

.checkpoint.is-confirmed { color: var(--signal-blue); }
.checkpoint.is-approaching { color: var(--caution-amber); }

.watch-line {
  font-family: var(--sans);
  font-size: 1.02rem;
  margin: -0.45rem 0 1rem;
  color: var(--ink);
}

.watch-line .num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.preview-levels {
  margin: 0 0 1.15rem;
}

.preview-kicker {
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 500;
  margin: 0 0 0.45rem;
  color: var(--ink);
}

.preview-tag {
  font-weight: 400;
  color: var(--data-slate);
}

.preview-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin: 0 0 0.22rem;
}

.preview-label {
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--data-slate);
}

.preview-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--data-slate);
}

.levels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  margin: 0 0 1.25rem;
}

.levels[hidden] {
  display: none;
}

.level-label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  margin-bottom: 0.15rem;
}

.level-num,
.num,
.expectancy-stat {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.level-num {
  font-size: 1.85rem;
  font-weight: 500;
  color: var(--signal-blue);
  letter-spacing: -0.03em;
}

.tier2 {
  border-top: 1px solid var(--line);
  padding-top: 0.95rem;
  margin-bottom: 1.15rem;
}

.expectancy {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.2rem 0.38rem;
  margin: 0 0 0.2rem;
  color: var(--ink);
}

.expectancy-stat {
  font-size: 1.15rem;
  font-weight: 500;
}

.expectancy-join {
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--data-slate);
}

.score-n {
  margin: 0 0 0.85rem;
}

.otto {
  font-family: var(--sans);
  font-size: 1.02rem;
  font-weight: 400;
  font-style: italic;
  margin: 0;
  color: var(--ink);
}

.size-block {
  margin: 0 0 1.1rem;
}

.risk-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.35rem 0 0.45rem;
}

input[type="range"] {
  flex: 1;
  accent-color: var(--ink);
}

.size-line {
  font-family: var(--mono);
  font-size: 0.92rem;
  color: var(--data-slate);
  margin: 0;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-bottom: 0.45rem;
}

.btn {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.72rem 0.6rem;
  border: 1px solid var(--ink);
  cursor: pointer;
}

.btn-ink {
  background: var(--ink);
  color: var(--paper);
}

.btn-quiet {
  background: var(--paper);
  color: var(--ink);
}

.action-note { margin: 0 0 1rem; }
.action-note.is-fail { color: var(--caution-amber); }
.action-note.is-ok { color: var(--ink); }

.tier3 {
  font-size: 0.78rem;
  line-height: 1.4;
  margin: 0 0 0.9rem;
}

.tier3 p { margin: 0 0 0.25rem; }

.expand {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: 0;
  border-top: 1px solid var(--line);
  padding: 0.7rem 0 0;
  font-family: var(--sans);
  font-size: 0.78rem;
  color: var(--data-slate);
  cursor: pointer;
}

.tier4 {
  font-size: 0.78rem;
  color: var(--data-slate);
  margin-top: 0.55rem;
}

.tier4 h2 {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0.7rem 0 0.25rem;
}

.tier4 p, .tier4 pre {
  margin: 0 0 0.45rem;
  white-space: pre-wrap;
  font-family: var(--sans);
}

.tier4 .num { font-size: 0.78rem; }

.error {
  color: var(--caution-amber);
  font-size: 0.9rem;
}

.screen-link {
  margin-top: 0.85rem;
}

.screen-link a {
  color: var(--data-slate);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}