:root {
  --paper: #f3f0e8;
  --ink: #16181a;
  --muted: #5d6166;
  --line: #c9c4b8;
  --accent: #d9531e;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141517;
    --ink: #ebe7de;
    --muted: #9a9ea3;
    --line: #34373b;
    --accent: #f07a45;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
}
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

.top {
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 22px 0 18px;
  border-bottom: 1px solid var(--ink);
}
.brand { font-weight: 700; font-size: 18px; letter-spacing: -0.01em; text-decoration: none; }
.brand span { color: var(--accent); }
nav { display: flex; gap: 18px; font: 13px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; }
nav a { text-decoration: none; color: var(--muted); }

/* scale-bar motif: major ticks every 10 units, minor every 1 */
.ruler {
  height: 14px;
  background:
    repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 60px) top left / 100% 14px no-repeat,
    repeating-linear-gradient(90deg, var(--muted) 0 1px, transparent 1px 6px) top left / 100% 6px no-repeat;
  opacity: 0.7;
}

.label { font: 12px/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0 0 8px; }

.hero { padding: 64px 0 40px; }
.hero h1 {
  font-size: clamp(40px, 9vw, 76px); line-height: 1; letter-spacing: -0.03em;
  margin: 0 0 20px; font-weight: 800;
}
.hero h1 span { color: var(--accent); }
.hero p { font-size: 19px; max-width: 34em; margin: 0 0 28px; }
.btn {
  display: inline-block; padding: 12px 20px; border: 1.5px solid var(--ink);
  font: 600 14px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; text-decoration: none;
}
.btn:hover { background: var(--ink); color: var(--paper); }

.specs { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); margin: 24px 0 56px; }
.specs div { padding: 18px 16px 18px 0; border-bottom: 1px solid var(--line); }
.specs div:nth-child(odd) { border-right: 1px solid var(--line); }
.specs div:nth-child(even) { padding-left: 16px; }
.specs b { display: block; font-size: 17px; }
.specs span { color: var(--muted); font-size: 15px; }
@media (max-width: 520px) {
  .specs { grid-template-columns: 1fr; }
  .specs div:nth-child(odd) { border-right: 0; }
  .specs div:nth-child(even) { padding-left: 0; }
}

article { padding: 48px 0 56px; }
article h1 { font-size: clamp(32px, 7vw, 46px); line-height: 1.05; letter-spacing: -0.02em; margin: 0 0 24px; }
article h2 { font-size: 20px; margin: 36px 0 8px; padding-top: 16px; border-top: 1px solid var(--line); }
article ul { padding-left: 20px; }
article li { margin: 6px 0; }

footer {
  border-top: 1px solid var(--ink); padding: 18px 0 40px;
  font: 13px var(--mono); color: var(--muted);
}
footer a { color: var(--muted); }