/* Option B — Blueprint.
   Warm paper, serif display, one indigo accent. A framed plate instead of a
   full-bleed canvas, so the page reads like a printed spec rather than a
   product demo. */

:root {
  --paper: #eeeae1;
  --paper-2: #f4f1e9;
  --card: #f8f5ee;
  --ink: #191c22;
  --ink-soft: #3b404b;
  --muted: #5d6472;
  --accent: #4f46e5;
  --line: rgba(25, 28, 34, 0.14);
  --line-strong: rgba(25, 28, 34, 0.3);
  --max: 1180px;
  --gutter: clamp(1.15rem, 4vw, 2.6rem);
  --r: 4px;
  --serif: ui-serif, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1rem/1.62 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* A faint paper tooth, no image request. */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  opacity: 0.5;
  background-image:
    radial-gradient(rgba(25,28,34,0.045) 1px, transparent 1px);
  background-size: 4px 4px;
}

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--ink); color: var(--paper);
  padding: 0.7rem 1rem; font-weight: 600;
}
.skip:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

code, .mono { font-family: var(--mono); font-size: 0.88em; }

/* ---------- nav ---------- */

.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: clamp(1rem, 3vw, 2rem);
  width: 100%;
  padding-block: 0.32rem;
  padding-inline: max(var(--gutter), calc((100vw - var(--max)) / 2 + var(--gutter)));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(10px);
}

.wordmark {
  font-family: var(--serif); font-size: 1.18rem; letter-spacing: -0.02em;
  color: var(--ink); text-decoration: none; font-weight: 600;
}
.wordmark span { color: var(--muted); font-weight: 400; }

.nav-links {
  display: flex; gap: clamp(0.9rem, 2vw, 1.5rem);
  margin: 0 0 0 auto; padding: 0; list-style: none;
}
.nav-links a {
  color: var(--muted); text-decoration: none;
  font-size: 0.86rem; letter-spacing: 0.01em;
  display: inline-flex; align-items: center; min-height: 44px;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.nav-links a:hover { color: var(--ink); border-bottom-color: var(--accent); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0.7rem 1.2rem;
  border: 1px solid var(--ink); border-radius: var(--r);
  font: inherit; font-size: 0.9rem; font-weight: 550;
  text-decoration: none; cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, transform 0.16s ease;
}
.btn-sm { min-height: 44px; padding: 0.5rem 1rem; font-size: 0.84rem; }
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.btn-ghost { border-color: var(--line-strong); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--ink); }

/* ---------- hero ---------- */

.hero {
  position: relative; z-index: 1;
  max-width: var(--max); margin-inline: auto;
  padding: clamp(2.4rem, 6vh, 4.2rem) var(--gutter) clamp(2.4rem, 6vh, 4rem);
  display: grid; grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(1.6rem, 4vw, 3.6rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 1.1rem;
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--muted);
  display: flex; align-items: center; gap: 0.7rem;
}
.eyebrow::after { content: ""; flex: 1; height: 1px; background: var(--line); }

h1 {
  margin: 0 0 1.15rem;
  font-family: var(--serif);
  font-size: clamp(2.35rem, 4.6vw, 3.9rem);
  line-height: 1.0;
  letter-spacing: -0.028em;
  font-weight: 500;
  text-wrap: balance;
}
h1 em { font-style: italic; }

.lede {
  margin: 0 0 1.8rem; max-width: 40ch;
  color: var(--ink-soft); font-size: 1.04rem; line-height: 1.66;
}

.cta-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.fineprint {
  margin: 1rem 0 0; font-size: 0.8rem; color: var(--muted);
  font-family: var(--mono); letter-spacing: 0.01em;
}

/* ---------- the plate ---------- */

.plate { margin: 0; }

.plate-frame {
  position: relative;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line-strong);
  background: var(--card);
  overflow: hidden;
}
#stage { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.tick { position: absolute; width: 9px; height: 9px; border: 0 solid var(--ink); opacity: 0.55; }
.tick.tl { top: -1px; left: -1px; border-top-width: 1px; border-left-width: 1px; }
.tick.tr { top: -1px; right: -1px; border-top-width: 1px; border-right-width: 1px; }
.tick.bl { bottom: -1px; left: -1px; border-bottom-width: 1px; border-left-width: 1px; }
.tick.br { bottom: -1px; right: -1px; border-bottom-width: 1px; border-right-width: 1px; }

.plate figcaption {
  display: flex; align-items: baseline; gap: 0.8rem;
  margin-top: 0.7rem; padding-top: 0.6rem;
  border-top: 1px solid var(--line);
  font-size: 0.76rem; color: var(--muted);
}
.plate .fig { font-family: var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink); }
.plate .state { margin-left: auto; color: var(--accent); letter-spacing: 0.08em; }

/* ---------- facts ---------- */

.strip {
  position: relative; z-index: 1;
  border-block: 1px solid var(--line);
  background: var(--paper-2);
}
.strip ul {
  list-style: none; margin: 0 auto; padding: clamp(1.2rem, 2.6vw, 1.8rem) var(--gutter);
  max-width: var(--max);
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2.2rem);
}
.strip li { display: flex; flex-direction: column; gap: 0.15rem; }
.strip .v {
  font-family: var(--serif); font-size: clamp(1.5rem, 2.4vw, 2rem);
  letter-spacing: -0.02em; color: var(--ink);
}
.strip .l { color: var(--muted); font-size: 0.8rem; line-height: 1.45; }

/* ---------- sections ---------- */

section { scroll-margin-top: 4.5rem; }

.how, .record, .limits {
  position: relative; z-index: 1;
  max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter);
  padding-block: clamp(3rem, 6.5vw, 5.4rem);
}
.record { border-top: 1px solid var(--line); }
.limits { border-top: 1px solid var(--line); }

.section-head { max-width: 56ch; margin-bottom: clamp(1.7rem, 3.4vw, 2.6rem); }
.kicker {
  display: block; margin-bottom: 0.8rem;
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--accent);
}
.section-head h2 {
  margin: 0 0 0.6rem;
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.06; letter-spacing: -0.025em;
  text-wrap: balance;
}
.section-head p { margin: 0; color: var(--muted); font-size: 0.98rem; max-width: 48ch; }

.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 2rem);
  counter-reset: step;
}
.steps li { padding-top: 1.1rem; border-top: 1px solid var(--ink); }
.steps .num {
  display: block; font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 0.85rem;
}
.steps h3 {
  margin: 0 0 0.45rem; font-family: var(--serif); font-weight: 600;
  font-size: 1.2rem; letter-spacing: -0.015em;
}
.steps p { margin: 0; color: var(--ink-soft); font-size: 0.94rem; line-height: 1.62; }

.ledger {
  margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(1.5rem, 4vw, 3.4rem);
}
.ledger > div {
  padding: 1.2rem 0;
  border-top: 1px solid var(--line);
}
.ledger dt {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink); margin-bottom: 0.45rem;
}
.ledger dd { margin: 0; color: var(--ink-soft); font-size: 0.95rem; line-height: 1.64; }
.ledger code { color: var(--accent); }

.band {
  position: relative; z-index: 1;
  max-width: var(--max); margin-inline: auto;
  padding: clamp(2rem, 4.5vw, 3.2rem) var(--gutter);
  border-block: 1px solid var(--line-strong);
  background: var(--paper-2);
  display: grid; grid-template-columns: minmax(0, 1fr) auto;
  align-items: center; gap: clamp(1rem, 3vw, 2.4rem);
}
.band h2 {
  grid-column: 1; margin: 0 0 0.4rem;
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(1.55rem, 2.8vw, 2.1rem); letter-spacing: -0.025em; line-height: 1.1;
  text-wrap: balance;
}
.band p { grid-column: 1; margin: 0; color: var(--muted); max-width: 52ch; }
.band .btn { grid-column: 2; grid-row: 1 / span 2; }

.limits ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; max-width: 66ch; }
.limits li { position: relative; padding-left: 1.6rem; color: var(--ink-soft); font-size: 0.97rem; line-height: 1.62; }
.limits li::before {
  content: ""; position: absolute; left: 0; top: 0.68em;
  width: 0.65rem; height: 1px; background: var(--accent);
}
.limits strong { color: var(--ink); font-weight: 600; }

footer {
  position: relative; z-index: 1;
  max-width: var(--max); margin-inline: auto;
  padding: 1.5rem var(--gutter) 2.6rem;
  border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 1rem;
  align-items: center; justify-content: space-between;
  font-size: 0.78rem; color: var(--muted);
}
footer p { margin: 0; }
footer nav { display: flex; gap: 1.3rem; }
footer a { color: var(--muted); text-decoration: none; display: inline-flex; align-items: center; min-height: 44px; border-bottom: 1px solid transparent; }
footer a:hover { color: var(--ink); border-bottom-color: var(--accent); }

/* ---------- responsive ---------- */

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; }
  .plate { order: 2; }
  .hero-copy { order: 1; }
  .lede { max-width: 52ch; }
  .steps { grid-template-columns: 1fr; }
  .strip ul { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .band { grid-template-columns: 1fr; align-items: start; }
  .band .btn { grid-column: 1; grid-row: auto; justify-self: start; }
}

@media (max-width: 620px) {
  .nav-links { display: none; }
  .hero { padding-top: 1.6rem; }
  .plate-frame { aspect-ratio: 1 / 1; }
  .ledger { grid-template-columns: 1fr; }
  .plate figcaption { flex-wrap: wrap; gap: 0.4rem 0.8rem; }
  .plate .state { margin-left: 0; }
  footer { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}