/* Reynolds Number of Everything — the front page's paper (Day edition) and ink (Night edition). Fonts are self-hosted Go fonts. */

@font-face { font-family: Go; src: url(../fonts/Go-Regular.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: Go; src: url(../fonts/Go-Italic.woff2) format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Go Smallcaps"; src: url(../fonts/Go-Smallcaps.woff2) format("woff2"); font-display: swap; }
@font-face { font-family: "Go Mono"; src: url(../fonts/Go-Mono.woff2) format("woff2"); font-display: swap; }

:root {
  --paper: #efe9dc; --paper-2: #e6dfcd; --ink: #1b1a17; --ink-2: #47433b; --muted: #675f52;
  --rule: rgba(27, 26, 23, .82); --hair: rgba(27, 26, 23, .16); --accent: #b5361d; --sun: #e0d2ad;
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, "URW Palladio L", Georgia, serif;
  --sans: Go, "Segoe UI", system-ui, sans-serif;
  --caps: "Go Smallcaps", Go, system-ui, sans-serif;
  --mono: "Go Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --gutter: clamp(16px, 3.4vw, 44px);
  color-scheme: light;
}
:root[data-edition="night"] {
  --paper: #111214; --paper-2: #18191c; --ink: #e9e2d2; --ink-2: #c3bba9; --muted: #8d8778;
  --rule: rgba(233, 226, 210, .7); --hair: rgba(233, 226, 210, .13); --accent: #ff7a57; --sun: #2c2820; color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 16px/1.55 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--accent); }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
::selection { background: var(--accent); color: var(--paper); }
.wrap { max-width: 1360px; margin-inline: auto; padding: 0 max(var(--gutter), env(safe-area-inset-right)) env(safe-area-inset-bottom) max(var(--gutter), env(safe-area-inset-left)); }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.smallcaps, .label { font-family: var(--caps); font-weight: 400; letter-spacing: .08em; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 200; background: var(--ink); color: var(--paper); padding: 8px 14px; }
.skip:focus { left: 8px; }
.small { font-size: 13px; color: var(--muted); }

/* ---------- Masthead, as on the front page ---------- */
.masthead { padding-top: clamp(14px, 2vw, 22px); }
.folio {
  display: flex; align-items: center; justify-content: space-between; gap: 6px 16px; flex-wrap: wrap;
  font-family: var(--caps); font-size: 13px; letter-spacing: .08em; color: var(--ink-2);
  border-bottom: 1px solid var(--rule); padding: 0 0 9px 64px; min-height: 44px;
}
.folio__now { font-size: 12.5px; letter-spacing: 0; color: var(--ink); }
.edition { display: flex; align-items: center; gap: 6px; }
.edition span { opacity: .5; }
.edition button { background: none; border: 0; padding: 8px 2px; font: inherit; letter-spacing: inherit; color: var(--muted); }
.edition button[aria-pressed="true"] { color: var(--ink); }
.edition button:hover { color: var(--accent); }
.wordmark { margin: clamp(10px, 1.6vw, 18px) 0 0; text-align: center; font: 400 clamp(44px, 7.6vw, 108px)/.95 var(--serif); letter-spacing: -.025em; padding-bottom: .06em; }
.wordmark__in { font-style: italic; font-size: .5em; margin-left: .04em; letter-spacing: 0; color: var(--accent); }
.dek {
  display: flex; justify-content: space-between; gap: 4px 24px; flex-wrap: wrap; margin-top: clamp(10px, 1.4vw, 16px); padding: 8px 0 7px;
  border-top: 3px double var(--rule); border-bottom: 1px solid var(--rule);
  font-family: var(--caps); font-size: 13px; letter-spacing: .07em; color: var(--ink-2);
}
.dek p { margin: 0; }

.wordmark { font-size: clamp(38px, 6.2vw, 92px); }
.wordmark__in { font-size: .62em; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- The rule ---------- */
.rule { margin: 0; padding: clamp(22px, 3vw, 40px) 0 0; }
.rule__box { width: 100%; min-width: 0; }
.rule svg { display: block; width: 100%; height: auto; user-select: none; -webkit-user-select: none; }
.rule figcaption { margin: 12px auto 0; text-align: center; font-size: 13px; color: var(--ink-2); font-style: italic; max-width: 72ch; }
.r-axis { stroke: var(--ink); stroke-width: 2; stroke-linecap: square; }
.r-ticks { fill: none; stroke: var(--ink); stroke-width: .9; }
.r-ticks--minor { stroke-width: .5; opacity: .6; }
.r-tick { font: 12px var(--mono); fill: var(--ink-2); }
.r-tick--minor { fill: var(--muted); font-size: 11px; }
.r-break { fill: none; stroke: var(--ink); stroke-width: 1.4; }
.r-annex { font: 11px var(--caps); letter-spacing: .1em; fill: var(--muted); }
.r-zone { opacity: .5; }
.r-hatch { stroke: var(--hair); stroke-width: 1; }
.r-zone__edge { stroke: var(--hair); stroke-width: 1; }
.r-band__name { font: 12.5px var(--caps); letter-spacing: .1em; fill: var(--muted); }
.r-mark { stroke: var(--ink); stroke-width: .7; stroke-dasharray: 2 4; opacity: .5; }
.r-mark__t { font: italic 13px var(--serif); fill: var(--ink-2); }
.r-leader { fill: none; stroke: var(--ink); stroke-width: .6; opacity: .5; }
.r-leader--mark { stroke-dasharray: 2 3; }
.r-dot { fill: var(--ink); stroke: var(--paper); stroke-width: 1.4; }
.r-dot--minor { fill: var(--paper); stroke: var(--ink); stroke-width: 1.1; }
.r-lab { font: italic 400 15px var(--serif); fill: var(--ink); }
.r-hit { fill: transparent; }
.ex { cursor: pointer; }
.ex:focus { outline: none; }
.ex:focus-visible .r-hit { stroke: var(--ink-2); stroke-width: 1; stroke-dasharray: 2 3; }
.ex--hover .r-lab, .ex:hover .r-lab { text-decoration: underline; text-decoration-thickness: 1px; }
.ex--hover .r-dot--minor, .ex:hover .r-dot--minor { fill: var(--ink); }
.ex--on .r-lab { fill: var(--accent); }
.ex--on .r-dot, .ex--on .r-dot--minor { fill: var(--accent); stroke: var(--paper); }
.ex--on .r-leader { stroke: var(--accent); opacity: .9; stroke-width: .9; }
.r-tip { pointer-events: none; }
.r-tip__box { fill: var(--paper); stroke: var(--rule); stroke-width: .8; }
.r-tip__leader { stroke: var(--ink); stroke-width: .6; opacity: .5; }
.r-tip--on .r-lab { fill: var(--accent); }
.r-tip--on .r-tip__leader { stroke: var(--accent); opacity: .9; }
.r-you { stroke: var(--accent); stroke-width: 2.4; }
.r-you__tri { fill: var(--accent); }
.r-you__t { font: 12.5px var(--caps); letter-spacing: .08em; fill: var(--accent); }

/* ---------- Stage: the readout and the calculator, side by side ---------- */
.stage { display: flex; flex-wrap: wrap; gap: 36px 56px; padding: clamp(28px, 3.4vw, 48px) 0 clamp(40px, 5vw, 64px); align-items: flex-start; border-top: 1px solid var(--hair); margin-top: clamp(20px, 2.6vw, 32px); }
.readout, .calc { flex: 1 1 420px; min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.readout:focus { outline: none; }
.label { font-size: 13px; color: var(--ink-2); margin: 0; }
.btn { min-height: 44px; min-width: 44px; padding: 0 12px; background: transparent; border: 1px solid var(--rule); font-family: var(--caps); letter-spacing: .06em; font-size: 14px; }
.btn:hover { color: var(--accent); border-color: var(--accent); }
.select, .num { min-height: 44px; background: var(--paper); color: var(--ink); border: 1px solid var(--rule); border-radius: 0; padding: 0 10px; font-size: 15px; }
.select { font-family: var(--sans); max-width: 100%; min-width: 0; }
.select:hover, .num:hover { border-color: var(--ink); }
.num { width: 9em; min-width: 0; flex: 1 1 7em; }
.select--unit { flex: 0 0 auto; }

.readout__head { display: flex; align-items: baseline; justify-content: space-between; gap: 4px 20px; flex-wrap: wrap; border-bottom: 1px solid var(--rule); padding-bottom: 10px; min-height: 64px; }
.readout__big { font: 400 clamp(30px, 3.4vw, 44px)/1.05 var(--serif); letter-spacing: -.02em; }
.readout__big sup { font-size: .55em; }
.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px 20px; margin: 0; }
.facts div { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.facts dt { font-family: var(--caps); font-size: 12px; letter-spacing: .07em; color: var(--muted); }
.facts dd { margin: 0; font-family: var(--mono); font-size: 15px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.readout__regime { margin: 0; font: italic 400 19px/1.3 var(--serif); }
.readout__note { margin: 0; font-size: 15px; color: var(--ink-2); }
.readout .small { margin: 0; }
.pick { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 14px; border-top: 1px solid var(--hair); }
.pick .select { flex: 1 1 12em; }

.calc__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px 24px; }
.field--wide { grid-column: 1 / -1; }
.calc__fluid { grid-column: 1 / -1; margin: -4px 0 0; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field__k { font-family: var(--caps); font-size: 12px; letter-spacing: .07em; color: var(--muted); }
.field__row { display: flex; gap: 8px; min-width: 0; flex-wrap: wrap; }
.range { width: 100%; min-height: 44px; margin: 0; accent-color: var(--ink-2); background: transparent; }
.result, .inverse { display: flex; flex-direction: column; gap: 8px; border-top: 1px solid var(--hair); padding-top: 12px; }
.calc__h { margin: 0; font: 400 12.5px var(--caps); letter-spacing: .08em; color: var(--muted); }
.result__looks, .inverse__out { margin: 0; font-size: 15px; color: var(--ink-2); max-width: 68ch; }
.inverse .btn { align-self: flex-start; }

/* ---------- Plates ---------- */
.plate { padding-bottom: clamp(40px, 5vw, 60px); }
.chapter__h {
  display: flex; align-items: baseline; gap: 12px; margin: 0 0 18px; padding-bottom: 8px; border-bottom: 1px solid var(--rule);
  font: italic 400 clamp(24px, 2.4vw, 32px)/1.1 var(--serif); letter-spacing: -.01em;
}
.chapter__n { font: 400 .62em/1 var(--caps); font-style: normal; letter-spacing: .1em; color: var(--accent); }
.plate__body { display: flex; flex-wrap: wrap; gap: 24px 48px; align-items: flex-start; }
.plate__text { flex: 1 1 320px; min-width: 0; display: flex; flex-direction: column; gap: 10px; font-size: 15px; color: var(--ink-2); }
.plate__text p { margin: 0; }
.eq { font-size: 17px; color: var(--ink); border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); padding: 8px 0; }
.eq i { font-family: var(--serif); }
.diagram { margin: 0; flex: 1 1 520px; max-width: 680px; min-width: 0; }
.diagram svg { display: block; width: 100%; height: auto; max-width: 680px; }
.diagram figcaption { margin-top: 8px; font-size: 13px; color: var(--ink-2); font-style: italic; max-width: 68ch; }
.d-stream { fill: none; stroke: var(--ink); stroke-width: 1; opacity: .7; }
.d-flag { stroke-width: 1.6; opacity: 1; }
.d-eddy { fill: none; stroke: var(--accent); stroke-width: 1; }
.d-ball { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.3; }
.d-shoulder { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.d-shell { fill: none; stroke: var(--ink); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.d-hinge { fill: var(--accent); }
.d-arrow { fill: none; stroke: var(--accent); stroke-width: 1.3; }
.d-turn { fill: none; stroke: var(--accent); stroke-width: 1.2; stroke-dasharray: 3 3; }
.d-rule { stroke: var(--hair); stroke-width: 1; }
.d-cap { font: 13px var(--caps); letter-spacing: .08em; fill: var(--ink-2); }
.d-note { font: italic 14px var(--serif); fill: var(--ink-2); }

.similar { flex: 1.6 1 520px; min-width: 0; }
.sim { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.sim caption { text-align: left; padding-bottom: 8px; color: var(--ink-2); }
.sim th, .sim td { text-align: left; vertical-align: top; padding: 9px 12px 9px 0; border-bottom: 1px solid var(--hair); }
.sim thead th { font: 12px var(--caps); letter-spacing: .07em; color: var(--muted); border-bottom: 1px solid var(--rule); }
.sim tbody th { font: 400 16px/1.2 var(--serif); }
.sim small { display: block; font: 12.5px var(--mono); color: var(--muted); margin-top: 2px; }
.sim td.mono { font-size: 13.5px; white-space: nowrap; }

@media (max-width: 600px) {
  .folio { padding-left: 60px; font-size: 12px; }
  .folio__now { display: none; }
  .dek { justify-content: center; text-align: center; }
  .dek p + p { display: none; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .calc__grid { grid-template-columns: minmax(0, 1fr); }
  .sim { font-size: 13.5px; }
  .sim td.mono { white-space: normal; }
  .d-cap { font-size: 19px; }
  .d-note { font-size: 21px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }

.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding: 12px 0 40px; border-top: 3px double var(--rule); font-size: 13px; color: var(--ink-2); }
.foot p { margin: 0; max-width: 72ch; }
.noscript { text-align: center; padding: 24px; }
sup { font-size: .68em; line-height: 0; }
.sup { font-size: .72em; }