:root {
  --ink: #111111;
  --paper: #f7f7f3;
  --white: #ffffff;
  --signal: #c8ff00;
  --muted: #5d5d58;
  --line: #c9c9c2;
  --pad: clamp(1.25rem, 4vw, 4.5rem);
  --sans: "Arial Narrow", "Aptos Narrow", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; overflow-x: hidden; color: var(--ink); background: var(--paper); font-family: var(--sans); }
a { color: inherit; text-underline-offset: .25em; }
a:focus-visible { outline: 3px solid var(--signal); outline-offset: 4px; }
::selection { color: var(--ink); background: var(--signal); }

.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 10; padding: .8rem 1rem; background: var(--signal); font-weight: 800; }
.skip-link:focus { top: 1rem; }

.site-header { min-height: 5.5rem; padding: 0 var(--pad); border-bottom: 1px solid var(--ink); display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.wordmark { font-family: var(--mono); font-size: clamp(1.1rem, 2vw, 1.45rem); font-weight: 800; text-decoration: none; letter-spacing: -.04em; }
.wordmark span { background: var(--signal); }
.studio-link { font-family: var(--mono); font-size: .76rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; }

.hero { min-height: calc(100svh - 5.5rem); display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(22rem, .95fr); border-bottom: 1px solid var(--ink); }
.hero-copy { padding: clamp(4rem, 9vh, 7.5rem) var(--pad); display: flex; flex-direction: column; align-items: flex-start; }
.intro, .product-index { margin: 0 0 2.5rem; font: 700 .75rem/1.2 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 11ch; margin: 0; font-size: clamp(3.6rem, 7vw, 6.75rem); line-height: .86; letter-spacing: -.04em; text-transform: uppercase; }
.lede { max-width: 32rem; margin: clamp(2rem, 5vh, 4rem) 0 2rem; color: var(--muted); font-size: clamp(1.15rem, 2vw, 1.5rem); line-height: 1.45; }
.primary-link { min-height: 3.5rem; padding: 1rem 1.25rem; display: inline-flex; align-items: center; gap: 3rem; background: var(--ink); color: var(--white); font: 800 .9rem/1 var(--mono); text-decoration: none; }
.primary-link:hover { color: var(--ink); background: var(--signal); }

.sheet-stage { min-height: 38rem; position: relative; overflow: hidden; display: grid; place-items: center; background: var(--ink); }
.sheet { position: absolute; width: min(68%, 29rem); aspect-ratio: 1 / 1.414; background: var(--white); }
.sheet-back { transform: translate(11%, -2%) rotate(6deg); background: var(--signal); }
.sheet-front { transform: rotate(-3deg); padding: 9% 8%; box-shadow: 0 1.4rem 4rem rgba(0,0,0,.35); }
.sheet-head { display: flex; align-items: end; justify-content: space-between; font: .65rem/1 var(--mono); }
.sheet-head b { font-size: 1.35rem; }
.rule { height: 3px; margin: 8% 0; background: var(--ink); }
.rule.short { width: 58%; margin-top: 12%; }
.task { padding: 5% 0; border-bottom: 1px solid #cfcfca; display: grid; grid-template-columns: 2rem 1fr 3rem; align-items: center; font: 700 clamp(.75rem, 1.4vw, 1.1rem)/1 var(--mono); }
.task b { width: 1.4rem; height: 1.4rem; display: grid; place-items: center; background: var(--ink); color: white; }
.task i { height: 1.5rem; border-bottom: 2px solid var(--ink); }
.checks { display: flex; gap: 8%; }.checks span { width: 1.5rem; aspect-ratio: 1; border: 2px solid var(--ink); }
.free-stamp { position: absolute; right: 8%; bottom: 11%; padding: .7rem 1rem; transform: rotate(5deg); background: var(--signal); font: 900 .75rem/1 var(--mono); text-transform: uppercase; letter-spacing: .1em; }

.product-section { padding: clamp(5rem, 10vw, 9rem) var(--pad); display: grid; grid-template-columns: .7fr 1.3fr 1fr; gap: clamp(2rem, 6vw, 7rem); align-items: start; }
.product-main h2 { margin: -.12em 0 1.25rem; font-size: clamp(3.2rem, 7vw, 6.5rem); line-height: .9; letter-spacing: -.04em; }
.product-main p { max-width: 32rem; margin: 0; font-size: clamp(1.15rem, 2vw, 1.45rem); line-height: 1.45; }
.facts { margin: 0; border-top: 1px solid var(--ink); }
.facts div { padding: 1rem 0 1.2rem; border-bottom: 1px solid var(--line); }
.facts dt { margin-bottom: .5rem; font: 800 .76rem/1 var(--mono); text-transform: uppercase; }
.facts dd { margin: 0; color: var(--muted); line-height: 1.5; }
.product-link { grid-column: 2; width: fit-content; font: 800 .85rem/1 var(--mono); text-transform: uppercase; }

footer { padding: 2rem var(--pad); border-top: 1px solid var(--ink); display: flex; justify-content: space-between; gap: 2rem; font: .75rem/1.5 var(--mono); }
footer p { margin: 0; } footer nav { display: flex; flex-wrap: wrap; gap: 1.5rem; }

@media (max-width: 760px) {
  .site-header { min-height: 4.5rem; }
  .studio-link { font-size: .68rem; }
  .hero { min-height: 0; grid-template-columns: minmax(0, 1fr); }
  .hero-copy { padding-top: 4rem; padding-bottom: 4rem; }
  h1 { font-size: clamp(2.5rem, 14vw, 4.2rem); }
  .sheet-stage { min-height: 33rem; }
  .sheet { width: min(70%, 18rem); }
  .product-section { grid-template-columns: 1fr; }
  .product-index { margin-bottom: 0; }
  .product-link { grid-column: 1; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }