:root {
  --paper:        #faf8f4;
  --paper-raised: #ffffff;
  --paper-sunk:   #f3f0e9;
  --ink:          #1a1815;
  --ink-2:        #57544b;
  --ink-3:        #8b8578;
  --rule:         #e3ded2;
  --rule-strong:  #cfc8b8;
  --brass:        #9a7a33;
  --brass-soft:   rgba(154, 122, 51, 0.14);
  --cliff:        #8e3b2f;
  --cliff-soft:   rgba(142, 59, 47, 0.10);
  --torpedo:      rgba(154, 122, 51, 0.13);
  --area:         rgba(26, 24, 21, 0.045);
  --curve:        #1a1815;
  --nominal:      #a9a396;

  --font-display: ui-serif, "New York", "Iowan Old Style", "Palatino Linotype",
                  Palatino, Georgia, "Times New Roman", serif;
  --font-ui:      ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
                  "Helvetica Neue", Arial, sans-serif;

  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --measure: 34rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:        #121110;
    --paper-raised: #1a1916;
    --paper-sunk:   #1d1c19;
    --ink:          #f2eee5;
    --ink-2:        #aaa496;
    --ink-3:        #7d776b;
    --rule:         #2d2a25;
    --rule-strong:  #413d36;
    --brass:        #c9a227;
    --brass-soft:   rgba(201, 162, 39, 0.16);
    --cliff:        #d4705c;
    --cliff-soft:   rgba(212, 112, 92, 0.12);
    --torpedo:      rgba(201, 162, 39, 0.12);
    --area:         rgba(242, 238, 229, 0.05);
    --curve:        #f2eee5;
    --nominal:      #6a655c;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 1.0625rem;
  line-height: 1.62;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

b, strong { font-weight: 600; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.masthead-inner {
  max-width: 78rem;
  margin: 0 auto;
  padding: clamp(1.75rem, 4vw, 3rem) var(--gutter) clamp(1.5rem, 3vw, 2.25rem);
}

.wordmark { display: flex; align-items: center; gap: 1.25rem; }

.wordmark-name {
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 600;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
}

.wordmark-rule {
  flex: 1;
  height: 1px;
  background: var(--rule-strong);
}

.proposition {
  font-weight: 400;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.4vw, 2.1rem);
  line-height: 1.25;
  font-weight: 400;
  margin: 1.1rem 0 0;
  max-width: 30ch;
  text-wrap: balance;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.badge-privacy { color: var(--brass); }

.layout {
  max-width: 78rem;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) var(--gutter) 4rem;
  display: grid;
  gap: clamp(2.5rem, 5vw, 4rem);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 62rem) {
  .layout {
    grid-template-columns: 21rem minmax(0, 1fr);
    column-gap: clamp(2.5rem, 4vw, 4.5rem);
    grid-template-areas:
      "controls answer"
      "controls chart"
      "controls breakdown"
      "disclaimer disclaimer";
    align-items: start;
  }

  .controls { grid-area: controls; align-self: stretch; }

  .controls-inner {
    position: sticky;
    top: 1.5rem;
    max-height: calc(100vh - 3rem);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .answer     { grid-area: answer; }
  .chart-panel{ grid-area: chart; }
  .breakdown  { grid-area: breakdown; }
  .disclaimer { grid-area: disclaimer; }
}

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.17em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.5rem;
}

.panel-hint {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-3);
}

.answer-figure {
  display: flex;
  align-items: flex-start;
  gap: 0.15em;
  margin: 0.5rem 0 0;
  color: var(--ink);
}

.answer-rate {
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 15vw, 8rem);
  line-height: 0.92;
  font-weight: 400;
  letter-spacing: -0.02em;
  font-variant-numeric: lining-nums tabular-nums;
}

.answer-unit {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1;
  padding-top: 0.35em;
  color: var(--ink-2);
}

.answer-caption {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  line-height: 1.45;
  max-width: 38ch;
  margin: 1rem 0 0;
  color: var(--ink-2);
}

.answer-caption b { color: var(--ink); font-weight: 600; }

.answer-why {
  margin: 1rem 0 0;
  max-width: var(--measure);
  font-size: 1rem;
  color: var(--ink-2);
  border-left: 2px solid var(--brass);
  padding-left: 1rem;
  min-height: 1.6em;
}

.answer-cliff {
  margin: 1rem 0 0;
  max-width: var(--measure);
  font-size: 1rem;
  color: var(--ink-2);
  background: var(--cliff-soft);
  border-left: 2px solid var(--cliff);
  padding: 0.85rem 1rem;
}

.answer-cliff b { color: var(--cliff); }

.chart-frame {
  margin: 0;
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  padding: clamp(0.5rem, 1.5vw, 1rem);
}

#chart {
  display: block;
  width: 100%;
  height: auto;
  touch-action: pan-y;
  outline: none;
}

#chart:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
}

#chart * { pointer-events: none; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.75rem;
  list-style: none;
  margin: 1.1rem 0 0;
  padding: 0;
  font-size: 0.9rem;
  color: var(--ink-2);
}

.legend li { display: flex; align-items: center; gap: 0.55rem; }

.swatch { width: 1.5rem; height: 0; border-top-width: 3px; border-top-style: solid; }
.swatch-real    { border-color: var(--curve); }
.swatch-nominal { border-color: var(--nominal); border-top-style: dashed; }
.swatch-cliff   { border-color: var(--cliff); border-top-style: dashed; }
.swatch-torpedo { height: 0.85rem; border: none; background: var(--torpedo); }

.cliff-strip {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}

.cliff-strip:empty { display: none; }

.cliff-strip li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.15rem 0.75rem;
  align-items: start;
  font-size: 0.95rem;
  color: var(--ink-2);
}

.cliff-strip .cliff-cost { grid-column: 2; }

@media (min-width: 34rem) {
  .cliff-strip li { grid-template-columns: auto minmax(0, 1fr) auto; column-gap: 1.25rem; }
  .cliff-strip .cliff-cost { grid-column: 3; }
}

.cliff-strip .cliff-mark {
  width: 0.5rem;
  height: 0.5rem;
  margin-top: 0.45rem;
  background: var(--cliff);
  transform: rotate(45deg);
}

.cliff-strip .cliff-where { color: var(--ink); }
.cliff-strip .cliff-where small { display: block; font-size: 0.8125rem; color: var(--ink-3); }
.cliff-strip .cliff-cost { color: var(--cliff); font-weight: 600; white-space: nowrap; }

.controls-inner {
  background: var(--paper-sunk);
  border: 1px solid var(--rule);
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
}

.controls .section-label { padding-bottom: 1rem; border-bottom: 1px solid var(--rule); display: block; }

.field { margin-top: 1.5rem; }

.field label,
.field > .label {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
}

.field-money {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  background: var(--paper-raised);
  border: 1px solid var(--rule-strong);
  padding: 0 0.85rem;
  min-height: 3rem;
}

.field-money:focus-within {
  border-color: var(--brass);
  box-shadow: 0 0 0 3px var(--brass-soft);
}

.currency { color: var(--ink-3); font-size: 1.05rem; }

.field input[type="text"] {
  flex: 1;
  min-width: 0;
  border: none;
  background: none;
  color: var(--ink);
  font: inherit;
  font-size: 1.15rem;
  font-variant-numeric: tabular-nums;
  padding: 0.6rem 0;
  outline: none;
}

select {
  width: 100%;
  min-height: 3rem;
  font: inherit;
  font-size: 1.05rem;
  color: var(--ink);
  background: var(--paper-raised);
  border: 1px solid var(--rule-strong);
  border-radius: 0;
  padding: 0 0.8rem;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%),
                    linear-gradient(135deg, var(--ink-3) 50%, transparent 50%);
  background-position: right 1.1rem center, right 0.75rem center;
  background-size: 0.35rem 0.35rem, 0.35rem 0.35rem;
  background-repeat: no-repeat;
}

select:focus-visible {
  outline: none;
  border-color: var(--brass);
  box-shadow: 0 0 0 3px var(--brass-soft);
}

select:disabled, option:disabled { color: var(--ink-3); }

.field-note {
  margin: 0.5rem 0 0;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--ink-3);
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  margin: 1rem 0 0;
  height: 2.75rem;
  background: none;
  outline: none;
}

.slider::-webkit-slider-runnable-track {
  height: 2px;
  background: var(--rule-strong);
}

.slider::-moz-range-track { height: 2px; background: var(--rule-strong); }

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 1.65rem; height: 1.65rem;
  margin-top: -0.8rem;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 2px solid var(--ink);
  cursor: grab;
}

.slider::-moz-range-thumb {
  width: 1.5rem; height: 1.5rem;
  border-radius: 50%;
  background: var(--paper-raised);
  border: 2px solid var(--ink);
  cursor: grab;
}

.slider:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px var(--brass-soft); border-color: var(--brass); }
.slider:focus-visible::-moz-range-thumb     { box-shadow: 0 0 0 4px var(--brass-soft); border-color: var(--brass); }

.more { margin-top: 1.75rem; border-top: 1px solid var(--rule); padding-top: 1rem; }

.more summary {
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  min-height: 2.75rem;
  padding: 0.6rem 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.more summary::-webkit-details-marker { display: none; }

.more summary::before {
  content: "+";
  color: var(--brass);
  font-size: 1.1rem;
  width: 1ch;
}

.more[open] summary::before { content: "−"; }

.control-actions { margin-top: 1.75rem; border-top: 1px solid var(--rule); padding-top: 1.5rem; }

.button {
  width: 100%;
  min-height: 3rem;
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--paper-raised);
  background: var(--ink);
  border: 1px solid var(--ink);
  padding: 0.7rem 1rem;
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease;
}

.button:hover { background: var(--brass); border-color: var(--brass); color: #fff; }
.button:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; }

.ledger { display: grid; gap: 2rem; }

.ledger-group { border-top: 1px solid var(--rule-strong); padding-top: 0.9rem; }

.ledger-group > h3 {
  margin: 0 0 0.5rem;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.ledger-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0 1.5rem;
  align-items: baseline;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.ledger-row:last-child { border-bottom: none; }

.ledger-term { color: var(--ink-2); }
.ledger-term small { display: block; font-size: 0.8125rem; color: var(--ink-3); line-height: 1.45; }

.ledger-value {
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
  white-space: nowrap;
}

.ledger-row.is-total { border-bottom: none; padding-top: 0.8rem; }
.ledger-row.is-total .ledger-term { color: var(--ink); font-weight: 600; }
.ledger-row.is-total .ledger-value {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 400;
}

.ledger-row.is-cliff .ledger-value { color: var(--cliff); }
.ledger-row.is-muted .ledger-value { color: var(--ink-3); }

.disclaimer { border-top: 1px solid var(--rule-strong); padding-top: 1.5rem; }

.disclaimer-grid {
  display: grid;
  gap: 2rem clamp(2rem, 4vw, 3.5rem);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  margin-top: 1.5rem;
}

.disclaimer h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 400;
  margin: 0 0 0.4rem;
}

.disclaimer p { margin: 0; font-size: 0.95rem; line-height: 1.6; color: var(--ink-2); }

.colophon {
  border-top: 1px solid var(--rule);
  background: var(--paper-sunk);
}

.colophon p {
  max-width: 78rem;
  margin: 0 auto;
  padding: 1.25rem var(--gutter);
  font-size: 0.9rem;
  color: var(--ink-3);
}

.colophon p + p { padding-top: 0; }
.colophon-privacy { color: var(--brass); }

.noscript {
  max-width: 78rem;
  margin: 0 auto;
  padding: 2rem var(--gutter);
  font-size: 1.05rem;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 2rem;
  transform: translate(-50%, 1rem);
  background: var(--ink);
  color: var(--paper);
  padding: 0.8rem 1.4rem;
  font-size: 0.95rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
  max-width: calc(100vw - 2rem);
  text-align: center;
}

.toast.is-shown { opacity: 1; transform: translate(-50%, 0); }

.axis-line   { stroke: var(--rule-strong); stroke-width: 1; }
.grid-line   { stroke: var(--rule); stroke-width: 1; }
.axis-label  { fill: var(--ink-3); font-size: 12px; font-family: var(--font-ui); }
.axis-title  { fill: var(--ink-3); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; font-family: var(--font-ui); }

.curve-line  { stroke: var(--curve); stroke-width: 2.25; fill: none; stroke-linejoin: round; stroke-linecap: round; }
.curve-area  { fill: var(--area); }
.nominal-line{ stroke: var(--nominal); stroke-width: 1.5; fill: none; stroke-dasharray: 5 4; }

.torpedo-band { fill: var(--torpedo); }
.torpedo-label { fill: var(--brass); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; font-family: var(--font-ui); }

.cliff-line  { stroke: var(--cliff); stroke-width: 1.5; stroke-dasharray: 4 4; }
.cliff-dot   { fill: var(--cliff); }
.cliff-label { fill: var(--cliff); font-size: 12px; font-family: var(--font-ui); font-weight: 600; }
.cliff-sub   { fill: var(--cliff); font-size: 11px; font-family: var(--font-ui); opacity: 0.8; }

.probe-line  { stroke: var(--ink); stroke-width: 1; }
.probe-dot   { fill: var(--paper-raised); stroke: var(--ink); stroke-width: 2.5; }
.probe-label { fill: var(--ink); font-size: 13px; font-weight: 600; font-family: var(--font-ui); }
.probe-plate { fill: var(--paper-raised); stroke: var(--rule-strong); }

.rmd-tick    { stroke: var(--brass); stroke-width: 1.5; }
.rmd-label   { fill: var(--brass); font-size: 11px; font-family: var(--font-ui); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

@media print {
  .controls, .colophon, .toast { display: none; }
  body { background: #fff; color: #000; }
}