/* GallonMan mini design system: color, type, spacing, radii, shadows, and components. */
:root {
  --ink: #0b2f3a;
  --ink-2: #164a53;
  --teal: #0d7772;
  --teal-dark: #075955;
  --aqua: #47d8cc;
  --aqua-soft: #d9f4f0;
  --coral: #e95c4f;
  --coral-soft: #fee5df;
  --gold: #f4bc43;
  --gold-soft: #fff1c9;
  --cream: #f8f4e9;
  --paper: #fffefa;
  --white: #fff;
  --line: #d9e1dc;
  --line-dark: #abc2bd;
  --muted: #5d7074;
  --success: #177a55;
  --danger: #a83a34;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --space-1: .375rem;
  --space-2: .625rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6.5rem;
  --radius-sm: .55rem;
  --radius: 1rem;
  --radius-lg: 1.6rem;
  --radius-xl: 2.4rem;
  --shadow-sm: 0 8px 25px rgba(11, 47, 58, .08);
  --shadow: 0 24px 60px rgba(11, 47, 58, .12);
  --shell: 76rem;
  --narrow: 52rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 7rem; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-sans);
  font-size: .975rem;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .22;
  background-image: radial-gradient(rgba(11,47,58,.12) .7px, transparent .7px);
  background-size: 18px 18px;
  mask-image: linear-gradient(to bottom, #000, transparent 70%);
}
img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--teal-dark); text-decoration-thickness: .09em; text-underline-offset: .18em; }
a:hover { color: var(--coral); }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }
::selection { color: var(--ink); background: var(--aqua); }
h1, h2, h3, p { overflow-wrap: break-word; }
h1, h2, h3 {
  margin: 0 0 .75em;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.07;
  letter-spacing: -.025em;
}
h1 { font-size: clamp(2.35rem, 5.4vw, 4.35rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 2.65rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
p { margin: 0 0 1.2em; }
ul, ol { padding-left: 1.3rem; }
strong { font-weight: 750; }
small { color: var(--muted); }
code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

.shell { width: min(calc(100% - 2rem), var(--shell)); margin-inline: auto; }
.narrow { max-width: var(--narrow); }
.section { padding-block: var(--space-7); }
.section--tight { padding-block: var(--space-5); }
.section--tint { background: var(--cream); border-block: 1px solid #ece4d4; }
.section--dark { color: var(--white); background: var(--ink); }
.centered { max-width: 45rem; margin-inline: auto; text-align: center; }
.lede { max-width: 48rem; margin: 0; color: var(--muted); font-size: clamp(1rem, 1.6vw, 1.12rem); }
.eyebrow, .kicker {
  margin: 0 0 .85rem;
  color: var(--teal);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .13em;
  line-height: 1.35;
  text-transform: uppercase;
}
.eyebrow--light { color: var(--aqua); }
.signal-dot { display: inline-block; width: .55rem; height: .55rem; margin-right: .45rem; border-radius: 50%; background: var(--aqua); box-shadow: 0 0 0 .28rem rgba(71,216,204,.16); }
.section-heading { margin-bottom: var(--space-5); }
.section-heading h2 { margin-bottom: .35rem; }
.section-heading p:last-child { max-width: 42rem; margin: 0; color: var(--muted); }
.section-heading--row { display: flex; align-items: end; justify-content: space-between; gap: var(--space-4); }
.text-link { display: inline-flex; align-items: center; gap: .45rem; font-weight: 750; text-decoration: none; }
.text-link span { transition: transform .2s ease; }
.text-link:hover span { transform: translateX(.2rem); }
.text-link--light { color: var(--white); }

.skip-link { position: fixed; top: .5rem; left: .5rem; z-index: 1000; padding: .7rem 1rem; color: var(--white); background: var(--ink); border-radius: .5rem; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; top: 0; z-index: 100; background: rgba(255,254,250,.94); border-bottom: 1px solid rgba(171,194,189,.6); backdrop-filter: blur(14px); }
.header__inner { min-height: 5rem; display: flex; align-items: center; gap: 1.5rem; }
.brand { display: flex; column-gap: .6rem; align-items: center; justify-content: flex-start; color: var(--ink); text-decoration: none; }
.brand-text { display: flex; flex-direction: column; }
.brand:hover { color: var(--ink); }
.brand__mark { grid-row: 1 / 3; color: var(--teal); width: 2.15rem; height: 2.4rem; }
.brand__word { font-family: var(--font-display); font-size: 1.55rem; font-weight: 800; line-height: 1; letter-spacing: -.045em; }
.brand__word span { color: var(--coral); }
.brand__tagline { color: var(--muted); font-size: .61rem; font-weight: 750; letter-spacing: .08em; line-height: 1.2; text-transform: uppercase; }
.primary-nav { margin-left: auto; display: flex; align-items: center; gap: .2rem; }
.primary-nav a { position: relative; padding: .8rem .9rem; color: var(--ink); border-radius: .55rem; font-size: .93rem; font-weight: 700; text-decoration: none; }
.primary-nav a:hover { color: var(--teal-dark); background: var(--aqua-soft); }
.primary-nav a[aria-current="page"]::after { content: ""; position: absolute; right: .9rem; bottom: .45rem; left: .9rem; height: 2px; background: var(--coral); border-radius: 4px; }
.header__quiz { flex: none; }
.menu-button { display: none; border: 0; background: transparent; font-weight: 750; cursor: pointer; }
.menu-button__icon { width: 1.4rem; display: grid; gap: .25rem; }
.menu-button__icon i { display: block; height: 2px; background: currentColor; border-radius: 4px; }
.mobile-nav { background: var(--paper); border-top: 1px solid var(--line); }
.mobile-nav .shell { padding-block: .5rem 1rem; display: grid; grid-template-columns: repeat(2, 1fr); gap: .35rem; }
.mobile-nav a { padding: .75rem; color: var(--ink); background: var(--cream); border-radius: .55rem; font-weight: 700; text-decoration: none; }
.breadcrumbs { padding-block: 1rem; }
.breadcrumbs ol { margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .35rem .65rem; list-style: none; color: var(--muted); font-size: .78rem; font-weight: 650; }
.breadcrumbs li + li::before { content: "/"; margin-right: .65rem; color: var(--line-dark); }
.breadcrumbs a { color: inherit; text-decoration: none; }

.button {
  min-height: 3rem;
  padding: .78rem 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  color: var(--white);
  background: var(--teal);
  border: 2px solid var(--teal);
  border-radius: .72rem;
  box-shadow: none;
  font-weight: 780;
  line-height: 1.15;
  text-decoration: none;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, color .2s ease, transform .2s ease;
}
.button:hover { color: var(--white); background: var(--teal-dark); border-color: var(--teal-dark); transform: translateY(-1px); }
.button--secondary { color: var(--ink); background: var(--white); border-color: var(--line-dark); }
.button--secondary:hover { color: var(--teal-dark); background: var(--aqua-soft); border-color: var(--teal); }
.button--ghost { color: var(--teal-dark); background: transparent; border-color: transparent; }
.button--ghost:hover { color: var(--coral); background: var(--coral-soft); border-color: transparent; }
.button--bright { color: var(--ink); background: var(--gold); border-color: var(--gold); }
.button--bright:hover { color: var(--ink); background: #ffd066; border-color: #ffd066; }
.button--outline-light { color: var(--white); background: transparent; border-color: rgba(255,255,255,.48); }
.button--outline-light:hover { color: var(--ink); background: var(--white); border-color: var(--white); }
.button--small { min-height: 2.5rem; padding: .57rem .9rem; font-size: .875rem; }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: .75rem; }

.page-heading { padding-block: clamp(3.5rem, 7vw, 6.5rem) var(--space-5); text-align: center; }
.page-heading h1 { font-size: clamp(2.3rem, 5.2vw, 3.85rem); }
.page-heading .lede { margin-inline: auto; }
.quick-answer { margin-top: var(--space-3); padding: var(--space-4) var(--space-5); display: grid; gap: .4rem; background: var(--aqua-soft); border: 1px solid #a8ded9; border-left: .45rem solid var(--teal); border-radius: var(--radius); }
.quick-answer span { color: var(--teal-dark); font-size: .74rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.quick-answer strong { font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.15; }
.quick-answer p { margin: 0; color: var(--muted); }
.quick-answer code { margin-top: .25rem; color: var(--ink-2); }
.quick-answer--large { margin-bottom: 1.5rem; }
.quick-intro { color: var(--muted); font-size: 1rem; }

.home-hero { position: relative; overflow: hidden; color: var(--white); background: var(--ink); }
.home-hero::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .3; background: radial-gradient(circle at 75% 35%, rgba(71,216,204,.24), transparent 34%), linear-gradient(115deg, transparent 55%, rgba(255,255,255,.035) 55% 56%, transparent 56%); }
.home-hero__grid { position: relative; min-height: 41rem; padding-block: 5.5rem 4rem; display: grid; grid-template-columns: minmax(0, .9fr) minmax(28rem, 1.1fr); gap: 3rem; align-items: center; }
.home-hero h1 { margin-bottom: .35em; color: var(--white); font-size: clamp(2.75rem, 5.8vw, 3.75rem); }
.home-hero__lede { max-width: 38rem; color: #d5e8e9; font-size: clamp(1.03rem, 1.6vw, 1.18rem); }
.home-hero .button-row { margin-block: 1.8rem 2rem; }
.home-hero .equivalence-strip { justify-content: flex-start; margin: 0; padding: .8rem 1rem; color: var(--white); background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.15); }
.hero-note { margin: .75rem 0 0; color: #a8c6c9; font-size: .8rem; }
.home-hero__visual { position: relative; }
.home-hero__ruler { height: .9rem; background: repeating-linear-gradient(90deg, var(--gold) 0 2px, transparent 2px 2rem), var(--teal-dark); }
.converter-dock { position: relative; z-index: 4; margin-top: -2.2rem; }

.equivalence-strip { width: fit-content; max-width: 100%; margin-block: 1rem 1.5rem; padding: .75rem 1rem; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .5rem .8rem; background: var(--cream); border: 1px solid var(--line); border-radius: 999px; font-weight: 800; }
.equivalence-strip b { color: var(--coral); }

.answer-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .9rem; }
.answer-grid a { min-height: 8.5rem; padding: 1.2rem; display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 1rem; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); text-decoration: none; }
.answer-grid a:hover { border-color: var(--teal); transform: translateY(-2px); }
.answer-grid strong { min-width: 4.1rem; color: var(--coral); font-family: var(--font-display); font-size: 2.05rem; line-height: 1; text-align: center; }
.answer-grid span { font-weight: 730; line-height: 1.35; }

.path-grid, .resource-grid { display: grid; gap: 1rem; }
.path-grid { grid-template-columns: repeat(4, 1fr); counter-reset: path; }
.resource-grid--three { grid-template-columns: repeat(3, 1fr); }
.resource-grid--two { grid-template-columns: repeat(2, 1fr); }
.resource-card { position: relative; min-height: 19rem; padding: 1.5rem; display: flex; flex-direction: column; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
.resource-card:hover { transform: translateY(-4px); border-color: var(--aqua); box-shadow: var(--shadow); }
.resource-card h3 { font-size: 1.35rem; }
.resource-card h2 { font-size: clamp(1.7rem, 3.5vw, 1.65rem); }
.resource-card h3 a { color: inherit; text-decoration: none; }
.resource-card h3 a::after { content: ""; position: absolute; inset: 0; }
.resource-card p:not(.kicker) { color: var(--muted); }
.resource-card .text-link { margin-top: auto; color: var(--teal-dark); }
.resource-card__icon { width: 3rem; height: 3rem; margin-bottom: 1.4rem; position: relative; color: var(--teal); background: var(--aqua-soft); border-radius: .8rem; }
.resource-card__icon::before, .resource-card__icon::after { content: ""; position: absolute; }
.icon--figure::before { left: 1.1rem; top: .55rem; width: .8rem; height: .8rem; border: 2px solid currentColor; border-radius: 50%; }
.icon--figure::after { left: .75rem; top: 1.45rem; width: 1.5rem; height: 1rem; border: 2px solid currentColor; border-radius: .4rem .4rem .8rem .8rem; }
.icon--calculator::before { inset: .55rem .7rem; border: 2px solid currentColor; border-radius: .25rem; box-shadow: inset 0 .55rem 0 rgba(13,119,114,.16); }
.icon--quiz::before { left: .8rem; top: .7rem; width: 1.4rem; height: 1.6rem; border: 2px solid currentColor; border-radius: .25rem; }
.icon--quiz::after { left: 1.15rem; top: 1.12rem; width: .65rem; height: .3rem; border-left: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(-45deg); }
.icon--print::before { left: .7rem; top: .9rem; width: 1.6rem; height: 1.2rem; border: 2px solid currentColor; border-radius: .25rem; }
.icon--print::after { left: .95rem; top: .45rem; width: 1.1rem; height: 1.6rem; border: 2px solid currentColor; background: var(--aqua-soft); }
.icon--chart::before { left: .7rem; bottom: .7rem; width: .35rem; height: .8rem; background: currentColor; box-shadow: .55rem -.4rem 0 currentColor, 1.1rem -.85rem 0 currentColor; }
.icon--metric::before { left: .65rem; top: .65rem; width: 1.7rem; height: 1.7rem; border: 2px solid currentColor; border-radius: 50%; }
.icon--metric::after { left: 1.45rem; top: .95rem; width: 2px; height: 1.05rem; background: currentColor; transform-origin: bottom; transform: rotate(35deg); }
.icon--compare::before { left: .6rem; top: .65rem; width: .75rem; height: 1.7rem; border: 2px solid currentColor; border-radius: .2rem; }
.icon--compare::after { right: .6rem; top: .65rem; width: .75rem; height: 1.7rem; border: 2px solid var(--coral); border-radius: .2rem; }
.icon--lesson::before { inset: .55rem; border-left: 2px solid currentColor; border-bottom: 2px solid currentColor; }
.icon--lesson::after { left: .8rem; top: 1.65rem; width: 1.5rem; height: 2px; background: currentColor; box-shadow: .4rem -.5rem 0 currentColor, .9rem -1rem 0 currentColor; transform: rotate(-34deg); }

.split-feature { display: grid; grid-template-columns: 1.1fr .9fr; gap: clamp(2rem, 7vw, 6rem); align-items: center; }
.split-feature__copy h2 {  }
.check-list { margin: 1.5rem 0 2rem; padding: 0; display: grid; gap: .75rem; list-style: none; }
.check-list li { position: relative; padding-left: 2rem; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: .05rem; width: 1.35rem; height: 1.35rem; display: grid; place-items: center; color: var(--white); background: var(--teal); border-radius: 50%; font-size: .75rem; font-weight: 900; }
.lesson-board { padding: 1.5rem; background: var(--ink); border-radius: var(--radius-xl); box-shadow: var(--shadow); transform: rotate(1.2deg); }
.lesson-board__label { color: var(--aqua); font-size: .72rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.lesson-board ol { margin: 0; padding: 0; display: grid; gap: .6rem; list-style: none; }
.lesson-board li { padding: .95rem; display: flex; gap: 1rem; align-items: center; color: var(--white); background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.09); border-radius: .8rem; }
.lesson-board li > span { color: var(--gold); font-family: var(--font-display); font-size: 1.4rem; font-weight: 800; }
.lesson-board strong, .lesson-board small { display: block; }
.lesson-board small { color: #abc8ca; }
.trust-band { padding-block: var(--space-7); display: grid; grid-template-columns: 1fr 1fr; gap: 2rem 4rem; align-items: end; }
.trust-band h2 { margin: 0; color: var(--white); }
.trust-band > p { margin: 0; color: #c6dcde; font-size: 1rem; }
.trust-band .button-row { grid-column: 1 / -1; }

.site-footer { padding-top: var(--space-7); color: #c6dcde; background: #061f27; }
.footer__grid { display: grid; grid-template-columns: 1.4fr repeat(3, .75fr); gap: 2rem; }
.site-footer .brand { color: var(--white); }
.site-footer .brand__tagline { color: #9bbdc0; }
.footer__brand p { max-width: 24rem; margin-top: 1.4rem; }
.footer__heading { margin-bottom: 1rem; color: var(--white); font-family: var(--font-sans); font-size: .75rem; letter-spacing: .12em; text-transform: uppercase; }
.site-footer ul { margin: 0; padding: 0; display: grid; gap: .6rem; list-style: none; }
.site-footer a { color: #c6dcde; text-decoration: none; }
.site-footer a:hover { color: var(--aqua); }
.footer__bottom { margin-top: 3rem; padding-block: 1.2rem; display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid rgba(255,255,255,.12); font-size: .78rem; }
.footer__bottom p { margin: 0; }
.footer__bottom div { display: flex; gap: 1.2rem; }

/* Converter */
.converter { padding: clamp(1.2rem, 3.5vw, 2.1rem); background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-xl); box-shadow: var(--shadow); }
.converter__topline { display: flex; align-items: start; justify-content: space-between; gap: 1rem; }
.converter__topline h2 { margin-bottom: 1.3rem; font-size: clamp(1.4rem, 2.4vw, 1.9rem); }
.system-badge { padding: .45rem .75rem; color: var(--teal-dark); background: var(--aqua-soft); border-radius: 999px; font-size: .7rem; font-weight: 800; white-space: nowrap; }
.converter__form { display: grid; grid-template-columns: minmax(7rem, .7fr) minmax(12rem, 1fr) auto minmax(12rem, 1fr); gap: .7rem; align-items: end; }
.field { display: grid; gap: .4rem; font-weight: 720; }
.field > span { font-size: .78rem; letter-spacing: .04em; }
.field input, .field select, .field textarea { width: 100%; min-height: 3.35rem; padding: .75rem .85rem; color: var(--ink); background: var(--paper); border: 1px solid var(--line-dark); border-radius: .65rem; }
.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--teal); }
.field small { font-weight: 500; }
.field textarea { resize: vertical; }
.field-error { color: var(--danger); font-size: .78rem; font-style: normal; font-weight: 700; }
.swap-button { width: 3.35rem; height: 3.35rem; display: grid; place-items: center; color: var(--teal); background: var(--aqua-soft); border: 1px solid #acdcd7; border-radius: 50%; cursor: pointer; }
.swap-button:hover { color: var(--white); background: var(--teal); }
.converter__result { margin-top: 1rem; padding: 1.1rem 1.2rem; position: relative; color: var(--white); background: var(--ink); border-radius: var(--radius); overflow: hidden; }
.converter__result::after { content: ""; position: absolute; right: -2rem; bottom: -4rem; width: 12rem; height: 12rem; border: 1.5rem solid rgba(71,216,204,.08); border-radius: 50%; }
.converter__equation { position: relative; z-index: 1; margin: 0; color: #b9d5d7; font-size: .82rem; }
.converter__number { position: relative; z-index: 1; margin: .15rem 0; color: var(--white); font-family: var(--font-display); font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; line-height: 1.1; }
.converter__precision { position: relative; z-index: 1; margin: .35rem 0 .8rem; color: #b9d5d7; font-size: .78rem; }
.converter__actions { position: relative; z-index: 2; display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; }
.copy-status { min-height: 1.5em; color: var(--aqua); font-size: .8rem; }
.converter__formula { margin-top: .8rem; padding: .75rem 1rem; display: flex; justify-content: space-between; gap: 1rem; background: var(--cream); border-radius: .65rem; font-size: .78rem; }
.converter__formula span { font-weight: 800; }
.converter__formula code { overflow-wrap: anywhere; text-align: right; }
.equivalence-explorer { margin-top: 1.25rem; padding-top: 1.25rem; border-top: 1px solid var(--line); }
.equivalence-explorer h3 { font-family: var(--font-sans); font-size: .85rem; }
.equivalence-explorer__grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: .5rem; }
.equivalence-explorer__grid div { padding: .8rem .6rem; display: grid; text-align: center; background: var(--cream); border-radius: .65rem; }
.equivalence-explorer__grid strong { font-family: var(--font-display); font-size: 1.3rem; }
.equivalence-explorer__grid span { color: var(--muted); font-size: .7rem; font-weight: 750; }
.converter--compact { padding: 1.2rem; border-radius: var(--radius-lg); }
.converter--compact .converter__topline h2 { font-size: 1.45rem; }
.converter--compact .converter__result { padding: .85rem 1rem; }
.converter--compact .converter__number { font-size: clamp(1.65rem, 3.5vw, 2.35rem); }

/* Gallon Lab illustration */
.gallon-lab { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(17rem, .75fr); background: #0d3843; border: 1px solid rgba(255,255,255,.12); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow); }
.gallon-lab__stage { min-width: 0; padding: 1rem; position: relative; display: grid; place-items: center; background: radial-gradient(circle at 50% 42%, #155160 0, #0b303a 58%, #08262f 100%); }
.gallon-lab__stage::before { content: ""; position: absolute; inset: 0; opacity: .18; background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px); background-size: 32px 32px; }
.gallon-lab__label { position: absolute; z-index: 3; top: 1rem; left: 1rem; color: #c5e1e2; font-size: .66rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.gallon-figure { position: relative; z-index: 2; width: min(100%, 37rem); height: auto; }
.figure-shadow ellipse { fill: rgba(0,0,0,.35); }
.figure-connectors path { fill: none; stroke: #6aa3a7; stroke-width: 17; stroke-linecap: round; }
.tank-shell { fill: #123f49; stroke: #89c3c5; stroke-width: 5; }
.tank-liquid { fill: #159f9a; }
.tank-wave { fill: url(#liquid-gradient-1); opacity: .95; animation: liquid-bob 4s ease-in-out infinite alternate; }
.tank-cap { fill: #f4bc43; stroke: #ffd36f; stroke-width: 4; }
.tank-light { fill: #fff1c9; stroke: #0b2f3a; stroke-width: 5; }
.tank-number { fill: #fff; font-family: var(--font-display); font-size: 108px; font-weight: 800; text-anchor: middle; }
.tank-unit { fill: #d9fffb; font-family: var(--font-sans); font-size: 24px; font-weight: 900; letter-spacing: 3px; text-anchor: middle; }
.tank-sub { fill: #082f39; font-family: var(--font-sans); font-size: 14px; font-weight: 900; letter-spacing: 3px; text-anchor: middle; }
.tank-gauge { fill: none; stroke: rgba(255,255,255,.45); stroke-width: 8; stroke-linecap: round; }
.tank-gauge-dot { fill: var(--gold); stroke: #fff; stroke-width: 3; }
.quart-pod { cursor: pointer; }
.pod-shell { fill: #f8f4e9; stroke: #47d8cc; stroke-width: 5; transition: fill .2s ease, stroke .2s ease; }
.quart-pod:hover .pod-shell, .quart-pod:focus .pod-shell, .quart-pod.is-active .pod-shell { fill: #fff1c9; stroke: #f4bc43; }
.pint-divider { stroke: #e95c4f; stroke-width: 3; stroke-dasharray: 4 4; opacity: .38; }
.pod-label { fill: #0b2f3a; font-family: var(--font-sans); font-size: 16px; font-weight: 900; text-anchor: middle; }
.pint-label { fill: #0d7772; font-family: var(--font-sans); font-size: 16px; font-weight: 900; text-anchor: middle; opacity: .38; }
.cup-dot { fill: #e95c4f; opacity: .3; }
.figure-face circle { fill: #0b2f3a; }
.figure-face path { fill: none; stroke: #0b2f3a; stroke-width: 7; stroke-linecap: round; }
.gallon-lab[data-level="quart"] .quart-pod .pod-shell, .gallon-lab[data-level="pint"] .quart-pod .pod-shell, .gallon-lab[data-level="cup"] .quart-pod .pod-shell { fill: var(--gold-soft); stroke: var(--gold); }
.gallon-lab[data-level="pint"] .pint-divider, .gallon-lab[data-level="pint"] .pint-label, .gallon-lab[data-level="cup"] .pint-divider, .gallon-lab[data-level="cup"] .pint-label { opacity: 1; }
.gallon-lab[data-level="cup"] .cup-dot { opacity: 1; animation: cup-pop .35s ease both; }
.gallon-lab__status { position: relative; z-index: 3; width: min(100%, 34rem); min-height: 4rem; padding: .75rem 1rem; display: grid; align-self: end; color: #d4e7e8; background: rgba(4,24,30,.78); border: 1px solid rgba(255,255,255,.12); border-radius: .8rem; }
.gallon-lab__status strong { color: var(--aqua); }
.gallon-lab__status span { font-size: .76rem; }
.gallon-lab__panel { padding: 1.25rem; color: var(--ink); background: var(--paper); }
.segmented { padding: .25rem; display: grid; grid-template-columns: repeat(3, 1fr); gap: .2rem; background: var(--cream); border: 1px solid var(--line); border-radius: .7rem; }
.segmented button { padding: .55rem .35rem; background: transparent; border: 0; border-radius: .5rem; font-size: .72rem; font-weight: 800; cursor: pointer; }
.segmented button.is-active { color: var(--white); background: var(--ink); }
.gallon-lab__prompt { min-height: 3.2rem; margin: 1.1rem 0 .7rem; color: var(--muted); font-size: .88rem; }
.unit-controls { display: grid; gap: .5rem; }
.unit-controls button { padding: .65rem .75rem; display: grid; grid-template-columns: 2rem 1fr auto; gap: .65rem; align-items: center; text-align: left; background: var(--white); border: 1px solid var(--line); border-radius: .7rem; font-weight: 750; cursor: pointer; }
.unit-controls button:hover, .unit-controls button.is-active { color: var(--teal-dark); background: var(--aqua-soft); border-color: var(--teal); }
.unit-controls button > span { width: 2rem; height: 2rem; display: grid; place-items: center; color: var(--white); background: var(--teal); border-radius: .45rem; font-family: var(--font-display); font-size: 1.15rem; }
.unit-controls small { font-size: .66rem; }
.remember-card { margin-top: 1rem; padding: .8rem; display: flex; gap: .75rem; align-items: center; background: var(--gold-soft); border: 1px solid #efd078; border-radius: .75rem; }
.remember-card > span { color: var(--coral); font-family: var(--font-display); font-weight: 900; white-space: nowrap; }
.remember-card strong { font-size: .8rem; }
.remember-card p { margin: .1rem 0 0; color: var(--muted); font-size: .68rem; line-height: 1.35; }
.text-equivalent { margin-top: .75rem; font-size: .75rem; }
.text-equivalent summary { font-weight: 750; cursor: pointer; }
.text-equivalent ul { margin-bottom: 0; }
.gallon-lab__quiz { margin-top: .7rem; padding: .9rem; background: var(--cream); border-radius: .75rem; }
.gallon-lab__quiz p { margin: 0 0 .6rem; }
.gallon-lab__quiz [data-gallon-choices] { display: grid; grid-template-columns: repeat(2, 1fr); gap: .4rem; }
.gallon-lab__quiz button { padding: .55rem; background: var(--white); border: 1px solid var(--line-dark); border-radius: .45rem; cursor: pointer; }
.gallon-lab.is-classroom { position: fixed; z-index: 900; inset: 1rem; grid-template-columns: minmax(0, 1.4fr) minmax(20rem, .6fr); overflow: auto; }
.gallon-lab--compact { grid-template-columns: 1fr; box-shadow: none; }
.gallon-lab--compact .gallon-lab__panel { display: none; }
.gallon-lab--compact .gallon-lab__stage { min-height: 32rem; }
.gallon-lab--compact .gallon-lab__status { display: none; }
.home-hero .gallon-lab--compact { background: transparent; border-color: rgba(255,255,255,.16); }

@keyframes liquid-bob { to { transform: translateY(-8px); } }
@keyframes cup-pop { from { transform: scale(.4); transform-origin: center; } to { transform: scale(1); } }

/* Editorial pages, tables, and learning components */
.article { padding-block: var(--space-5) var(--space-7); }
.article-grid { display: grid; grid-template-columns: 14rem minmax(0, var(--narrow)); justify-content: center; gap: clamp(2rem, 6vw, 5rem); align-items: start; }
.article-toc { position: sticky; top: 7rem; padding: 1rem; display: grid; gap: .5rem; background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); font-size: .8rem; }
.article-toc strong { margin-bottom: .25rem; color: var(--ink); }
.article-toc a { padding: .25rem 0; color: var(--muted); text-decoration: none; }
.article-toc a:hover { color: var(--coral); }
.prose { min-width: 0; }
.prose > section { margin-bottom: clamp(3.2rem, 7vw, 5.5rem); }
.prose > section:last-child { margin-bottom: 0; }
.prose h2 { margin-top: 0; font-size: clamp(1.65rem, 3vw, 2.35rem); }
.prose h3 { margin-top: 1.6rem; }
.prose p, .prose li { color: #294d54; font-size: .985rem; }
.prose li + li { margin-top: .55rem; }
.prose a { font-weight: 700; }
.step-list { margin-block: 1.5rem; display: grid; gap: .8rem; }
.step-list > div { padding: 1rem; display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; align-items: start; background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); }
.step-list > div > span { width: 3rem; height: 3rem; display: grid; place-items: center; color: var(--white); background: var(--teal); border-radius: .75rem; font-family: var(--font-display); font-size: 1.45rem; font-weight: 800; }
.step-list h3 { margin: 0 0 .3rem; }
.step-list p { margin: 0; font-size: .92rem; }
.callout { padding: 1.1rem 1.2rem; border-radius: var(--radius); }
.callout h2 { font-size: 1.4rem; }
.callout p:last-child { margin-bottom: 0; }
.callout--note { background: var(--aqua-soft); border-left: .4rem solid var(--teal); }
.callout--tip { background: var(--gold-soft); border-left: .4rem solid var(--gold); }
.callout--warning { background: var(--coral-soft); border-left: .4rem solid var(--coral); }
.example-stack { display: grid; gap: .75rem; }
.example-stack article { padding: 1.1rem 1.2rem; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.example-stack h3 { margin: 0 0 .6rem; font-family: var(--font-sans); font-size: 1rem; letter-spacing: 0; }
.example-stack code, .formula-card code { display: block; padding: .7rem .8rem; color: var(--ink); background: var(--aqua-soft); border-radius: .5rem; overflow-wrap: anywhere; }
.example-stack p { margin: .7rem 0 0; font-size: .92rem; }
.mistake-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
.mistake-grid > div { padding: 1rem; background: var(--cream); border: 1px solid var(--line); border-radius: .8rem; }
.mistake-grid strong { display: block; margin-bottom: .25rem; }
.mistake-grid p { margin: 0; font-size: .88rem; }
.practice-card { padding: 1.4rem; background: var(--ink); border-radius: var(--radius-lg); }
.practice-card h2, .practice-card p { color: var(--white); }
.practice-card h2 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); }
.practice-options { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; }
.practice-options button { padding: .7rem; color: var(--white); background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.25); border-radius: .55rem; font-weight: 800; cursor: pointer; }
.practice-options button:hover, .practice-options button.is-correct { color: var(--ink); background: var(--aqua); border-color: var(--aqua); }
.practice-options button.is-wrong { background: var(--coral); border-color: var(--coral); }
.practice-card [data-practice-feedback] { min-height: 1.6em; margin: .75rem 0 0; color: #c8dfe1; font-size: .85rem; }
.formula-card { margin-block: 1.1rem; padding: 1rem; background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); }
.formula-card span { display: block; margin-bottom: .6rem; color: var(--teal); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.mini-path { padding: 1rem; display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; background: var(--cream); border-radius: var(--radius); font-weight: 800; }
.mini-path b { color: var(--coral); }
.source-note { padding-top: 1rem; color: var(--muted) !important; border-top: 1px solid var(--line); font-size: .83rem !important; }
.comparison-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; }
.comparison-cards > div { padding: 1rem; display: grid; gap: .2rem; background: var(--cream); border: 1px solid var(--line); border-radius: .8rem; }
.comparison-cards span, .comparison-cards small { color: var(--muted); font-size: .72rem; }
.comparison-cards strong { font-family: var(--font-display); font-size: 1.2rem; }
.definition-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: .65rem; }
.definition-list > div { padding: .9rem; background: var(--cream); border-radius: .7rem; }
.definition-list strong, .definition-list span { display: block; }
.definition-list span { color: var(--coral); font-size: .66rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.definition-list p { margin: .35rem 0 0; font-size: .82rem; }
.level-tag { display: inline-flex; padding: .35rem .65rem; color: var(--teal-dark); background: var(--aqua-soft); border-radius: 999px; font-size: .7rem; font-weight: 800; }

.table-scroll { max-width: 100%; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); }
.table-scroll:focus-visible { outline-offset: 3px; }
table { min-width: 42rem; background: var(--white); font-variant-numeric: tabular-nums; }
caption { padding: 1rem; color: var(--ink); background: var(--cream); font-family: var(--font-display); font-size: 1.12rem; font-weight: 800; text-align: left; }
th, td { padding: .8rem .9rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: left; }
thead th { color: var(--white); background: var(--ink); font-size: .75rem; letter-spacing: .025em; }
tbody th { color: var(--ink); background: #f2f8f6; }
tbody tr:nth-child(even) td { background: #fbfaf5; }
tr:last-child > * { border-bottom: 0; }
tr > *:last-child { border-right: 0; }
.chart-sheet { margin-top: 1.5rem; padding: 1.5rem; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); }
.chart-sheet__masthead { margin-bottom: 1rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.chart-sheet__masthead .brand__tagline { display: none; }
.chart-sheet__masthead > span { color: var(--muted); font-size: .78rem; font-weight: 800; text-align: right; }
.chart-sheet__tip { margin: 1rem 0 .4rem; padding: .8rem; background: var(--gold-soft); border-radius: .6rem; }
.chart-sheet__source { margin: 0; color: var(--muted); font-size: .7rem; }
.print-actions { margin-block: 1rem 2rem; padding: .9rem; display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); }
.print-actions > span { color: var(--muted); font-size: .76rem; }

.related { border-top: 1px solid var(--line); }
.related__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
.related-link { position: relative; padding: 1rem 3rem 1rem 1rem; display: grid; gap: .25rem; color: var(--ink); background: var(--cream); border: 1px solid var(--line); border-radius: .8rem; text-decoration: none; }
.related-link::after { content: "→"; position: absolute; right: 1rem; top: 50%; color: var(--coral); font-size: 1.3rem; transform: translateY(-50%); }
.related-link:hover { color: var(--teal-dark); border-color: var(--teal); }
.related-link span { font-weight: 800; }
.related-link small { line-height: 1.4; }
.guide-index { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2.5rem; }
.guide-index h2 { font-size: 1.7rem; }
.guide-index ul { margin: 0; padding: 0; display: grid; gap: .65rem; list-style: none; }
.guide-index a { padding: .9rem; display: grid; color: var(--ink); background: var(--cream); border: 1px solid var(--line); border-radius: .7rem; text-decoration: none; }
.guide-index a:hover { border-color: var(--teal); }
.guide-index span { color: var(--muted); font-size: .78rem; line-height: 1.4; }

/* Worksheets */
.worksheet-meta { margin-bottom: 1rem; display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.worksheet-meta > div { padding: 1rem; display: grid; gap: .25rem; background: var(--cream); border: 1px solid var(--line); border-radius: .75rem; }
.worksheet-meta span { color: var(--teal); font-size: .68rem; font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.worksheet-sheet { margin-top: 1.5rem; padding: clamp(1.2rem, 4vw, 3rem); background: #fff; border: 1px solid var(--line-dark); box-shadow: var(--shadow-sm); }
.worksheet-sheet__header { padding-bottom: 1rem; border-bottom: 3px solid var(--ink); }
.worksheet-sheet__header .brand__tagline { display: none; }
.worksheet-sheet__header h2 { margin: 1rem 0; font-size: 2rem; }
.student-fields { display: flex; justify-content: space-between; gap: 2rem; font-size: .82rem; }
.worksheet-instructions { margin-block: 1.4rem; padding: .9rem; background: var(--cream); border-radius: .6rem; }
.worksheet-instructions h3 { margin: 0 0 .25rem; font-family: var(--font-sans); font-size: .85rem; text-transform: uppercase; }
.worksheet-instructions p { margin: 0; font-size: .85rem; }
.blank-map { margin-block: 1.5rem; padding: 1rem; border: 2px dashed var(--line-dark); border-radius: .8rem; }
.blank-map__whole { margin: auto auto 1rem; width: fit-content; padding: .65rem 2rem; border: 2px solid var(--ink); border-radius: 999px; font-weight: 900; }
.blank-map__quarters { display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; }
.blank-map__quarters > div { padding: .7rem; display: grid; gap: .25rem; border: 2px solid var(--teal); border-radius: .5rem; text-align: center; }
.blank-map__quarters span, .blank-map__quarters small { color: var(--muted); font-size: .7rem; }
.worksheet-section { margin-block: 2rem; }
.worksheet-section h3 { padding-bottom: .35rem; border-bottom: 2px solid var(--ink); font-size: 1.22rem; }
.worksheet-section li { margin-bottom: 1rem; padding-left: .35rem; break-inside: avoid; }
.answer-lines { min-height: 2.4rem; margin-top: .45rem; background: repeating-linear-gradient(to bottom, transparent 0 1.35rem, #d5d5d5 1.35rem calc(1.35rem + 1px)); }
.worksheet-sheet__footer { margin-top: 2rem; padding-top: .7rem; color: var(--muted); border-top: 1px solid var(--line); font-size: .68rem; text-align: center; }
.answer-key { margin-block: 1rem 3rem; }
.answer-key details { background: var(--aqua-soft); border: 1px solid #abdcd7; border-radius: var(--radius); }
.answer-key summary { padding: 1rem; font-weight: 800; cursor: pointer; }
.answer-key__content { padding: 0 1.2rem 1.2rem; }
.answer-key__content h2 { font-size: 1.7rem; }
.answer-key__content h3 { margin: 1.5rem 0 .5rem; font-family: var(--font-sans); font-size: .95rem; }

/* Quiz */
.quiz { padding: clamp(1rem, 3vw, 1.7rem); background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-xl); box-shadow: var(--shadow); }
.quiz__intro { padding-bottom: 1rem; display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: end; border-bottom: 1px solid var(--line); }
.quiz__intro p { margin: 0 0 .6rem; color: var(--muted); }
.quiz__progress { min-width: 11rem; display: grid; gap: .35rem; font-size: .73rem; font-weight: 800; }
.quiz__progress progress { width: 100%; height: .65rem; accent-color: var(--teal); }
.quiz__question { margin: 1.5rem 0 0; padding: 0; border: 0; }
.quiz__question + .quiz__question { padding-top: 2rem; border-top: 1px solid var(--line); }
.quiz.is-enhanced .quiz__question + .quiz__question { padding-top: 0; border-top: 0; }
.quiz__question legend { width: 100%; margin-bottom: 1rem; font-family: var(--font-display); font-size: clamp(1.3rem, 2.4vw, 1.75rem); font-weight: 800; line-height: 1.2; }
.quiz__question legend span { display: block; margin-bottom: .45rem; color: var(--teal); font-family: var(--font-sans); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; }
.quiz__choices { display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; }
.quiz__choices label { position: relative; cursor: pointer; }
.quiz__choices input { position: absolute; opacity: 0; }
.quiz__choices span { min-height: 3.2rem; padding: .8rem 1rem; display: flex; align-items: center; background: var(--cream); border: 2px solid transparent; border-radius: .7rem; font-weight: 700; }
.quiz__choices input:focus-visible + span { outline: 3px solid var(--gold); outline-offset: 2px; }
.quiz__choices input:checked + span { background: var(--aqua-soft); border-color: var(--teal); }
.quiz__choices label.is-correct span { background: #dcf6e8; border-color: var(--success); }
.quiz__choices label.is-wrong span { background: var(--coral-soft); border-color: var(--danger); }
.quiz__controls { margin-top: 1rem; display: flex; gap: .6rem; }
.quiz__feedback { margin-top: 1rem; padding: 1rem; background: var(--aqua-soft); border-left: .35rem solid var(--teal); border-radius: .6rem; }
.quiz__feedback p { margin: .25rem 0 0; }
.quiz__result { padding: 2rem 1rem; text-align: center; }
.quiz__result h2 { font-size: 2.5rem; }
.quiz__result .button { margin: .25rem; }
.notice { padding: .8rem; background: var(--gold-soft); border-radius: .6rem; font-size: .82rem; }

/* Teacher, trust, legal, and contact */
.teacher-toolkit { padding-block: var(--space-7); display: grid; grid-template-columns: .75fr 1.25fr; gap: 3rem; align-items: start; }
.toolkit-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: .7rem; }
.toolkit-links a { padding: 1rem; display: grid; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: .8rem; text-decoration: none; }
.toolkit-links a:hover { border-color: var(--teal); }
.toolkit-links span { color: var(--muted); font-size: .78rem; }
.lesson-facts { position: sticky; top: 7rem; display: grid; gap: .7rem; }
.lesson-facts > div { padding: .9rem; display: grid; gap: .25rem; background: var(--cream); border: 1px solid var(--line); border-radius: .7rem; }
.lesson-facts span { color: var(--teal); font-size: .65rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.lesson-facts strong { font-size: .8rem; }
.sequence-timeline { position: relative; padding-left: 2.2rem; }
.sequence-timeline::before { content: ""; position: absolute; top: .6rem; bottom: 2rem; left: .6rem; width: 2px; background: var(--line-dark); }
.sequence-timeline section { position: relative; margin-bottom: 3rem; }
.sequence-timeline section::before { content: ""; position: absolute; top: .45rem; left: -2rem; width: .85rem; height: .85rem; background: var(--gold); border: 3px solid var(--paper); border-radius: 50%; box-shadow: 0 0 0 2px var(--teal); }
.sequence-timeline section > span { color: var(--coral); font-size: .7rem; font-weight: 900; letter-spacing: .12em; text-transform: uppercase; }
.lesson-check { padding: .8rem; background: var(--aqua-soft); border-radius: .6rem; }
.methodology > section { position: relative; padding-left: 4.5rem; }
.method-number { position: absolute; left: 0; top: 0; color: var(--coral); font-family: var(--font-display); font-size: 2.1rem; font-weight: 900; }
.source-list { display: grid; gap: .75rem; }
.source-list article { padding: 1.1rem; background: var(--cream); border: 1px solid var(--line); border-radius: .8rem; }
.source-list article > span { color: var(--coral); font-family: monospace; font-size: .7rem; }
.source-list h3 { margin: .3rem 0 .5rem; font-family: var(--font-sans); font-size: 1rem; }
.source-list p { margin: 0; font-size: .86rem; }
.contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem, 7vw, 5rem); align-items: start; }
.contact-copy { position: sticky; top: 7rem; }
.contact-form { padding: 1.3rem; display: grid; gap: 1rem; background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius-lg); }
.contact-form .button { justify-self: start; }
.form-error { padding: .8rem; color: var(--danger); background: var(--coral-soft); border: 1px solid #eeb1aa; border-radius: .6rem; font-weight: 700; }
.honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.legal .page-heading + & { padding-top: 0; }
.state-page { min-height: 35rem; padding-block: var(--space-8); display: grid; place-items: center; align-content: center; text-align: center; }
.state-page h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
.state-page > p { max-width: 42rem; color: var(--muted); font-size: 1rem; }
.state-icon { width: 4rem; height: 4rem; display: grid; place-items: center; color: var(--white); background: var(--teal); border-radius: 50%; font-size: 2rem; font-weight: 900; }
.state-code { color: var(--coral); font-family: var(--font-display); font-size: clamp(5rem, 18vw, 10rem); font-weight: 900; line-height: .8; opacity: .18; }
.state-links { width: 100%; margin-block: 1.5rem; display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; }
.state-links a { padding: 1rem; display: grid; color: var(--ink); background: var(--cream); border: 1px solid var(--line); border-radius: .8rem; text-decoration: none; }
.state-links span { color: var(--muted); font-size: .75rem; }

.content-meta { display: flex; flex-wrap: wrap; gap: .45rem 1rem; margin-top: -1rem; margin-bottom: 1.6rem; color: var(--muted); font-size: .84rem; }
.content-meta span { display: inline-flex; align-items: center; gap: .3rem; }
.content-meta span + span::before { content: "•"; margin-right: .7rem; color: var(--line-strong); }
.content-meta a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .16em; }
.ad-placement { width: min(calc(100% - 2rem), var(--narrow)); min-height: 7rem; margin: 0 auto var(--space-5); padding-top: 1rem; border-top: 1px solid var(--line); }
.ad-placement .adsbygoogle { display: block; }
.ad-placement > span { display: block; margin-bottom: .4rem; color: var(--muted); font-size: .62rem; letter-spacing: .1em; text-align: center; text-transform: uppercase; }

/* Responsive behavior */
@media (max-width: 68rem) {
  .primary-nav { display: none; }
  .header__quiz { margin-left: auto; }
  .menu-button { display: flex; align-items: center; gap: .45rem; }
  .home-hero__grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .path-grid { grid-template-columns: repeat(2, 1fr); }
  .resource-grid--three { grid-template-columns: repeat(2, 1fr); }
  .gallon-lab { grid-template-columns: 1fr; }
  .gallon-lab__panel { display: grid; grid-template-columns: 1fr 1fr; gap: .7rem 1rem; }
  .gallon-lab__panel .segmented, .gallon-lab__panel .remember-card, .gallon-lab__panel .text-equivalent { grid-column: 1 / -1; }
  .gallon-lab__prompt { margin: 0; }
  .gallon-lab__quiz { margin: 0; }
  .article-grid { grid-template-columns: 12rem minmax(0, 1fr); gap: 2rem; }
}

@media (max-width: 52rem) {
  .section { padding-block: var(--space-6); }
  .home-hero__grid { padding-top: 4rem; grid-template-columns: 1fr; }
  .home-hero h1 { max-width: 12ch; }
  .home-hero__visual { max-width: 37rem; margin-inline: auto; }
  .answer-grid { grid-template-columns: repeat(2, 1fr); }
  .split-feature, .trust-band, .teacher-toolkit, .contact-grid { grid-template-columns: 1fr; }
  .lesson-board { transform: none; }
  .trust-band .button-row { grid-column: auto; }
  .footer__grid { grid-template-columns: 1.2fr repeat(2, 1fr); }
  .footer__grid > div:last-child { grid-column: 2; }
  .converter__form { grid-template-columns: 1fr 1fr; }
  .converter__form .field--value { grid-column: 1 / -1; }
  .swap-button { grid-row: 3; position: absolute; left: 50%; margin-top: .05rem; transform: translateX(-50%) rotate(90deg); }
  .converter__form { position: relative; }
  .converter__formula { display: grid; }
  .converter__formula code { text-align: left; }
  .equivalence-explorer__grid { grid-template-columns: repeat(3, 1fr); }
  .article-grid { grid-template-columns: 1fr; }
  .article-toc, .lesson-facts, .contact-copy { position: static; }
  .article-toc { grid-template-columns: repeat(2, 1fr); }
  .article-toc strong { grid-column: 1 / -1; }
  .guide-index { grid-template-columns: 1fr; }
  .worksheet-meta { grid-template-columns: 1fr; }
}

@media (max-width: 38rem) {
  :root { --space-7: 3.5rem; }
  .shell { width: min(calc(100% - 1.2rem), var(--shell)); }
  .header__inner { min-height: 4.4rem; gap: .7rem; }
  .brand__tagline, .header__quiz { display: none; }
  .brand__mark { grid-row: auto; }
  .brand { grid-template-columns: auto auto; }
  .mobile-nav .shell { grid-template-columns: 1fr; }
  .page-heading { padding-top: 2.7rem; }
  .page-heading h1 { font-size: clamp(2.05rem, 9vw, 2.9rem); }
  h2 { font-size: clamp(1.6rem, 7vw, 2.15rem); }
  h3 { font-size: clamp(1.12rem, 5vw, 1.35rem); }
  .button-row { align-items: stretch; }
  .button-row .button { flex: 1 1 12rem; }
  .home-hero__grid { min-height: auto; padding-block: 3rem; }
  .home-hero h1 { font-size: clamp(2.55rem, 11vw, 3.55rem); }
  .home-hero .equivalence-strip { border-radius: var(--radius); }
  .gallon-lab--compact .gallon-lab__stage { min-height: 23rem; padding: .3rem; }
  .converter-dock { margin-top: -.7rem; }
  .section-heading--row { align-items: start; flex-direction: column; }
  .answer-grid, .path-grid, .resource-grid--three, .resource-grid--two, .related__grid, .comparison-cards, .definition-list, .toolkit-links { grid-template-columns: 1fr; }
  .answer-grid a { min-height: 6.5rem; }
  .resource-card { min-height: 15rem; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
  .footer__grid > div:last-child { grid-column: auto; }
  .footer__bottom { align-items: start; flex-direction: column; }
  .converter { padding: .9rem; border-radius: var(--radius); }
  .converter__topline { display: block; }
  .system-badge { display: inline-flex; margin-bottom: .8rem; white-space: normal; }
  .converter__form { grid-template-columns: 1fr; }
  .converter__form .field--value { grid-column: auto; }
  .swap-button { position: static; grid-row: auto; margin: -.2rem auto; transform: rotate(90deg); }
  .converter__number { font-size: 1.8rem; }
  .converter__actions .button { flex: 1 1 auto; }
  .equivalence-explorer__grid { grid-template-columns: repeat(2, 1fr); }
  .gallon-lab__stage { padding: .4rem; }
  .gallon-lab__label { font-size: .55rem; }
  .gallon-lab__panel { padding: .9rem; display: block; }
  .gallon-lab__prompt { margin: .9rem 0 .5rem; }
  .unit-controls button { grid-template-columns: 2rem 1fr auto; }
  .remember-card { align-items: start; flex-direction: column; }
  .gallon-lab.is-classroom { inset: 0; display: block; border-radius: 0; }
  .article-toc { grid-template-columns: 1fr; }
  .article-toc strong { grid-column: auto; }
  .mistake-grid, .practice-options, .blank-map__quarters, .quiz__choices, .state-links { grid-template-columns: 1fr; }
  .mini-path { align-items: start; flex-direction: column; }
  .mini-path b { transform: rotate(90deg); }
  .chart-sheet { padding: .7rem; }
  .chart-sheet__masthead { align-items: start; flex-direction: column; }
  .chart-sheet__masthead > span { text-align: left; }
  .student-fields { flex-direction: column; gap: .4rem; }
  .worksheet-sheet { padding: 1rem; }
  .worksheet-sheet__header h2 { font-size: 1.65rem; }
  .quiz__intro { grid-template-columns: 1fr; }
  .quiz__progress { width: 100%; }
  .methodology > section { padding-left: 0; padding-top: 3rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media print {
  @page { size: auto; margin: .55in; }
  :root { --ink: #000; --muted: #333; }
  body { color: #000; background: #fff; font-size: 10.5pt; line-height: 1.35; }
  body::before, .site-header, .breadcrumbs, .site-footer, .page-heading, .content-meta, .print-actions, .related, .ad-placement, .button, .answer-key, .section:not(.print-keep), .worksheet-meta { display: none !important; }
  main { display: block; }
  .chart-sheet, .worksheet-sheet { width: 100%; margin: 0; padding: 0; border: 0; border-radius: 0; box-shadow: none; }
  .chart-sheet .table-scroll { overflow: visible; border-color: #777; }
  .chart-sheet table { min-width: 0; font-size: 8pt; }
  .chart-sheet th, .chart-sheet td { padding: .3rem; border-color: #777; }
  .chart-sheet thead th { color: #000; background: #ddd; }
  .chart-sheet__tip { padding: .4rem; background: #eee; }
  .worksheet-sheet__header .brand { display: flex; }
  .worksheet-sheet__header .brand__mark { width: 1.5rem; }
  .worksheet-sheet__header h2 { margin: .6rem 0; font-size: 18pt; }
  .worksheet-instructions { margin-block: .7rem; padding: .45rem; background: #eee; }
  .blank-map { margin-block: .6rem; }
  .worksheet-section { margin-block: .9rem; break-inside: auto; }
  .worksheet-section h3 { margin-bottom: .4rem; font-size: 12pt; }
  .worksheet-section li { margin-bottom: .45rem; }
  .answer-lines { min-height: 1.35rem; }
  body.print-answer-key .worksheet-sheet { display: none !important; }
  body.print-answer-key .answer-key { display: block !important; margin: 0; }
  body.print-answer-key .answer-key details { border: 0; }
  body.print-answer-key .answer-key summary { display: none; }
  body.print-answer-key .answer-key__content { display: block; padding: 0; }
  body.print-answer-key .answer-key__content h2 { font-size: 18pt; }
  body.print-answer-key .answer-key__content li { margin-bottom: .3rem; }
  a { color: #000; text-decoration: none; }
  a[href^="http"]::after { content: ""; }
}