:root {
  --paper: #eef6f3;
  --paper-deep: #dceee9;
  --ink: #173c43;
  --ink-soft: #527177;
  --line: #b5d4cf;
  --teal: #16858a;
  --teal-dark: #0e626b;
  --coral: #df6d57;
  --sun: #f4c85e;
  --white: #fbfffd;
  --display: "Iowan Old Style", "Baskerville", "Palatino Linotype", Georgia, serif;
  --body: "Avenir Next", "Helvetica Neue", system-ui, sans-serif;
  --utility: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal-dark); text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:hover { color: var(--coral); }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 4px; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.topbar {
  width: min(1280px, calc(100% - 40px));
  margin: 0 auto;
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: baseline; gap: 12px; color: var(--ink); text-decoration: none; }
.brand span { font-family: var(--utility); font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; }
.brand small { color: var(--teal); font-size: .72rem; letter-spacing: .09em; text-transform: uppercase; }
.language-nav { display: flex; gap: 4px; }
.language-link {
  min-width: 44px;
  min-height: 44px;
  display: grid;
  place-items: center;
  color: var(--ink-soft);
  font-family: var(--utility);
  font-size: .76rem;
  letter-spacing: .08em;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.language-link:hover, .language-link.is-current { color: var(--ink); border-bottom-color: var(--coral); }

.article-shell { width: min(1280px, calc(100% - 40px)); margin: 0 auto; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, .9fr);
  gap: clamp(32px, 7vw, 110px);
  align-items: center;
  padding: clamp(56px, 9vw, 120px) 0 clamp(42px, 6vw, 88px);
}
.hero-copy { max-width: 620px; }
.eyebrow {
  margin: 0 0 16px;
  color: var(--coral);
  font-family: var(--utility);
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
}
h1, h2 { font-family: var(--display); font-weight: 500; letter-spacing: -.045em; }
h1 { margin: 0; font-size: clamp(3.3rem, 7vw, 6.8rem); line-height: .91; }
h1 em { color: var(--teal-dark); font-style: normal; }
h2 { margin: 0 0 20px; font-size: clamp(2.15rem, 4vw, 3.8rem); line-height: .98; }
.hero-deck { max-width: 580px; margin: 28px 0 17px; color: var(--ink-soft); font-size: clamp(1.12rem, 1.7vw, 1.36rem); line-height: 1.5; }
.hero-answer { max-width: 560px; margin: 0; font-size: 1rem; }
.hero-answer strong { color: var(--teal-dark); }
.source-line, .method-note, .tool-help { color: var(--ink-soft); font-size: .83rem; }
.source-line { max-width: 520px; margin: 18px 0 0; }

.film-figure {
  position: relative;
  margin: 0;
  padding: clamp(10px, 2vw, 25px);
  background: linear-gradient(140deg, rgba(255,255,255,.66), rgba(200,238,230,.4));
  border: 1px solid var(--line);
  border-radius: 48% 52% 44% 56% / 42% 46% 54% 58%;
  box-shadow: 0 24px 60px rgba(23,60,67,.10);
}
.film-figure::before {
  content: "";
  position: absolute;
  inset: 5% 8%;
  border: 1px solid rgba(22,133,138,.25);
  border-radius: 50%;
  pointer-events: none;
}
.film-figure svg { display: block; width: 100%; height: auto; }
.film-figure figcaption { margin: 0 8% 8px; color: var(--ink-soft); font-size: .75rem; line-height: 1.45; }

.section-rule { border-top: 1px solid var(--line); }
.measure-section {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(300px, 1.1fr);
  gap: clamp(26px, 7vw, 100px);
  align-items: start;
  padding: clamp(48px, 7vw, 90px) 0;
}
.section-intro { max-width: 580px; }
.section-intro > p:last-child, .reading-section > p { max-width: 710px; }
.measure-section p, .reading-section > p, .simulator-section p { margin-top: 0; font-size: 1.04rem; }

.blink-tool {
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 5px solid var(--coral);
  box-shadow: 12px 12px 0 rgba(22,133,138,.10);
}
.timer-readout { display: flex; align-items: baseline; gap: 10px; margin-bottom: 20px; }
.timer-readout span { font-family: var(--utility); font-size: clamp(2.4rem, 5vw, 4.4rem); line-height: 1; color: var(--teal-dark); }
.timer-readout small { color: var(--ink-soft); font-family: var(--utility); font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; }
.blink-actions { display: flex; flex-wrap: wrap; gap: 9px; }
.button {
  min-height: 46px;
  padding: 10px 14px;
  border: 1px solid var(--teal-dark);
  border-radius: 2px;
  background: transparent;
  color: var(--teal-dark);
  cursor: pointer;
  font: inherit;
  font-size: .84rem;
  font-weight: 700;
}
.button:hover:not(:disabled) { background: var(--teal-dark); color: var(--white); }
.button:disabled { cursor: not-allowed; opacity: .45; }
.button-primary { background: var(--teal-dark); color: var(--white); }
.button-blink { border-color: var(--coral); color: #9a3e30; }
.button-blink:hover:not(:disabled) { background: var(--coral); }
.button-quiet { border-color: var(--line); color: var(--ink-soft); }
.tool-help { margin: 16px 0; }
.personal-result { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; padding-top: 17px; border-top: 1px solid var(--line); }
.personal-result > div { min-width: 0; }
.result-label { display: block; min-height: 40px; color: var(--ink-soft); font-size: .7rem; line-height: 1.3; text-transform: uppercase; letter-spacing: .08em; }
.personal-result strong { display: block; color: var(--ink); font-family: var(--utility); font-size: 1.1rem; }

.reading-section { padding: clamp(48px, 7vw, 100px) clamp(0px, 10vw, 150px); }
.scale-figure, .rate-figure { margin: 34px 0 30px; padding: 24px 0 18px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.scale-row, .rate-row { display: grid; grid-template-columns: minmax(145px, 1fr) minmax(120px, 2fr) minmax(90px, .45fr); gap: 16px; align-items: center; margin: 16px 0; }
.scale-row > span, .rate-row > span { font-size: .83rem; color: var(--ink-soft); }
.scale-row strong, .rate-row strong { font-family: var(--utility); font-size: .85rem; text-align: right; white-space: nowrap; }
.scale-track, .rate-track { height: 18px; position: relative; overflow: hidden; background: var(--paper-deep); }
.scale-bar, .rate-bar { display: block; height: 100%; transform-origin: left; }
.scale-bar-a { width: 100%; background: linear-gradient(90deg, var(--teal), #8bd8c9); }
.scale-bar-b { width: 1.6%; min-width: 8px; background: var(--coral); }
.scale-ratio { margin: 26px 0 0 !important; color: var(--teal-dark); font-family: var(--utility); font-size: .84rem !important; }
.scale-ratio strong { color: var(--coral); font-size: 1.1rem; }
.rate-bar-flow { width: 100%; background: var(--coral); }
.rate-bar-evap { width: 18%; min-width: 22px; background: var(--teal); }

.simulator-section { padding: clamp(48px, 7vw, 100px) 0; }
.simulator-grid { display: grid; grid-template-columns: minmax(250px, .85fr) minmax(0, 1.15fr); gap: clamp(28px, 6vw, 86px); align-items: center; margin-top: 34px; }
.simulator-controls { display: grid; gap: 10px; }
.simulator-controls label { display: flex; justify-content: space-between; gap: 14px; color: var(--ink-soft); font-size: .88rem; }
.simulator-controls output { color: var(--ink); font-family: var(--utility); white-space: nowrap; }
input[type="range"] { width: 100%; height: 42px; accent-color: var(--coral); cursor: pointer; }
.simulator-controls .button { justify-self: start; margin-top: 10px; }
.film-simulator { min-height: 180px; padding: 34px 24px; background: var(--paper-deep); border: 1px solid var(--line); }
.film-lane { position: relative; height: 42px; margin: 36px 0 52px; background: linear-gradient(90deg, #83cfc2, #f7dda1 50%, #e58a73); }
.film-lane-fill { position: absolute; inset: 0 auto 0 0; width: var(--fill, 17%); background: rgba(23,60,67,.22); transition: width .15s ease; }
.marker { position: absolute; top: -14px; width: 2px; height: 70px; background: var(--ink); transform: translateX(-1px); }
.marker::after { content: ""; position: absolute; bottom: -8px; left: -5px; width: 11px; height: 11px; border-radius: 50%; background: currentColor; }
.marker i { position: absolute; bottom: -35px; left: 50%; width: max-content; transform: translateX(-50%); font-family: var(--utility); font-size: .68rem; font-style: normal; color: var(--ink-soft); }
.marker-interval { left: var(--interval-pos, 17%); color: var(--teal-dark); }
.marker-break { left: var(--break-pos, 78%); color: var(--coral); }
.simulator-readout { display: flex; justify-content: space-between; gap: 24px; }
.simulator-readout small { display: block; color: var(--ink-soft); font-family: var(--utility); font-size: .67rem; letter-spacing: .1em; text-transform: uppercase; }
.simulator-readout strong { display: block; color: var(--ink); font-family: var(--utility); font-size: 1.35rem; }
.method-note { margin: 24px 0 0; max-width: 800px; }

.sources-section { padding: clamp(48px, 7vw, 100px) 0; }
.source-list { max-width: 840px; margin: 30px 0 0; padding-left: 22px; }
.source-list li { padding: 9px 0 9px 8px; }
.source-list a { font-weight: 700; }
.footer { width: min(1280px, calc(100% - 40px)); margin: 0 auto; padding: 26px 0 40px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: .82rem; }
.footer a { color: var(--teal-dark); }
.back-top { white-space: nowrap; }

@media (max-width: 850px) {
  .hero, .measure-section, .simulator-grid { grid-template-columns: 1fr; }
  .hero { gap: 36px; }
  .hero-copy { max-width: none; }
  .film-figure { max-width: 660px; }
  .reading-section { padding-left: 0; padding-right: 0; }
}
@media (max-width: 560px) {
  .topbar, .article-shell, .footer { width: min(100% - 28px, 1280px); }
  .topbar { min-height: 64px; }
  .brand { gap: 7px; }
  .brand small { display: none; }
  .hero { padding-top: 50px; }
  h1 { font-size: clamp(3rem, 15vw, 4.4rem); }
  h2 { font-size: 2.3rem; }
  .film-figure { padding: 5px; border-radius: 22% 78% 25% 75% / 35% 37% 63% 65%; }
  .film-figure figcaption { margin: 0 15px 10px; }
  .blink-tool { padding: 18px; }
  .blink-actions .button { flex: 1 1 100%; }
  .personal-result { gap: 8px; }
  .result-label { font-size: .63rem; }
  .personal-result strong { font-size: .95rem; }
  .scale-row, .rate-row { grid-template-columns: 1fr auto; gap: 8px 12px; }
  .scale-row > span, .rate-row > span { grid-column: 1 / -1; }
  .scale-track, .rate-track { grid-column: 1; }
  .scale-row strong, .rate-row strong { grid-column: 2; grid-row: 2; }
  .film-simulator { padding: 28px 14px; }
  .simulator-readout { gap: 8px; }
  .simulator-readout strong { font-size: 1.05rem; }
  .footer { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
}