:root {
  --text: #171717;
  --muted: #6f6f6f;
  --line: #e4e4e4;
  --soft: #f7f7f7;
  --page: 1120px;
  --prose: 720px;
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  color: var(--text);
  background: #fff;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.site-shell {
  width: min(var(--page), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}

.site-name {
  text-decoration: none;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.035em;
}

.post-header {
  width: min(var(--prose), calc(100% - 40px));
  margin: 62px auto 48px;
}

.post-date {
  display: block;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin-bottom: 18px;
  font-size: clamp(38px, 6vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.045em;
  font-weight: 680;
}

.post-dek {
  margin-bottom: 0;
  color: #505050;
  font-size: 19px;
  line-height: 1.55;
}

.prose,
.section-heading,
.post-footer {
  width: min(var(--prose), calc(100% - 40px));
  margin-left: auto;
  margin-right: auto;
}

.prose p { margin-bottom: 1.15em; }

.wide {
  width: min(var(--page), calc(100% - 40px));
  margin-left: auto;
  margin-right: auto;
}

.post-section { margin-top: 58px; }

.section-heading { margin-bottom: 18px; }

h2 {
  margin-bottom: 8px;
  font-size: 27px;
  line-height: 1.2;
  letter-spacing: -0.025em;
  font-weight: 660;
}

.section-note {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.table-scroll {
  overflow-x: auto;
  border-top: 1px solid var(--text);
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  min-width: 1030px;
  border-collapse: collapse;
  font-size: 13px;
  line-height: 1.45;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #444;
  font-size: 12px;
  font-weight: 650;
}

th:first-child,
td:first-child {
  width: 220px;
  padding-left: 0;
}

th:last-child,
td:last-child { padding-right: 0; }

tbody tr:last-child td { border-bottom: 0; }

.strategy {
  font-weight: 680;
  line-height: 1.35;
}

.subline {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-weight: 400;
}

.nowrap { white-space: nowrap; }

.calculator {
  border-top: 1px solid var(--text);
  border-bottom: 1px solid var(--line);
  padding: 24px 0 30px;
}

.preset-row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px 18px;
  margin-bottom: 28px;
}

.preset {
  appearance: none;
  border: 0;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  padding: 0 0 3px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.preset:hover,
.preset:focus-visible {
  color: var(--text);
  outline: none;
}

.preset.active {
  color: var(--text);
  border-bottom-color: var(--text);
}

.input-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px 24px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  color: #4f4f4f;
  font-size: 13px;
  font-weight: 620;
}

.control { position: relative; }

input {
  width: 100%;
  min-height: 42px;
  border: 1px solid #cfcfcf;
  border-radius: 2px;
  background: #fff;
  color: var(--text);
  padding: 9px 42px 9px 10px;
  font: inherit;
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

input:focus {
  border-color: #555;
  outline: 2px solid rgba(0, 0, 0, .06);
}

.unit {
  position: absolute;
  top: 50%;
  right: 10px;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 12px;
  pointer-events: none;
}

.advanced {
  margin-top: 24px;
  padding-top: 17px;
  border-top: 1px solid var(--line);
}

.advanced summary {
  width: fit-content;
  cursor: pointer;
  color: #4f4f4f;
  font-size: 13px;
  font-weight: 650;
}

.advanced .input-grid {
  grid-template-columns: repeat(2, minmax(0, 260px));
  margin-top: 18px;
}

.result-list {
  margin: 30px 0 0;
  border-top: 1px solid var(--line);
}

.result-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.result-row dt {
  color: #4f4f4f;
  font-size: 14px;
}

.result-row dd {
  margin: 0;
  font-size: 21px;
  font-weight: 660;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.result-row.primary {
  padding-top: 18px;
  padding-bottom: 18px;
}

.result-row.primary dt { color: var(--text); }

.result-row.primary dd { font-size: 31px; }

.result-explanation {
  max-width: 640px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.equivalents {
  margin-top: 34px;
}

.equivalents h3 {
  margin-bottom: 8px;
  font-size: 17px;
  font-weight: 660;
}

.equivalent-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.equivalent-list li {
  display: grid;
  grid-template-columns: minmax(190px, .7fr) minmax(0, 1.3fr);
  gap: 22px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.equivalent-list strong {
  font-size: 16px;
  font-weight: 660;
  font-variant-numeric: tabular-nums;
}

.equivalent-list span {
  color: var(--muted);
  font-size: 14px;
}

.method {
  margin-top: 38px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.method summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 650;
}

.method p {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
}

.post-footer {
  margin-top: 56px;
  padding: 24px 0 54px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.index-main {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto;
  padding: 10px 0 70px;
}

.index-entry {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 28px;
  padding: 30px 0 34px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.index-entry time {
  padding-top: 4px;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.index-entry h1 {
  margin-bottom: 10px;
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.12;
}

.index-entry p {
  max-width: 640px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.index-entry:hover h1 { text-decoration: underline; text-underline-offset: 4px; }

@media (max-width: 820px) {
  .input-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  body { font-size: 16px; }

  .site-shell,
  .wide,
  .post-header,
  .prose,
  .section-heading,
  .post-footer,
  .index-main {
    width: calc(100% - 28px);
  }

  .site-header-inner { min-height: 60px; }
  .post-header { margin-top: 42px; }
  h1 { font-size: 38px; }
  .post-section { margin-top: 46px; }

  .input-grid,
  .advanced .input-grid {
    grid-template-columns: 1fr;
  }

  .result-row,
  .equivalent-list li,
  .index-entry {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .result-row dd { text-align: left; }
  .index-entry time { padding-top: 0; }
}