/* ztek — paper and ink, one signal colour. System fonts only: nothing loads from another origin. */
:root {
  color-scheme: light;
  --paper: #f3efe6;
  --card: #fbf9f4;
  --ink: #161412;
  --muted: #5d5850;
  --line: #d9d2c3;
  --signal: #ff4f1f;
  --signal-ink: #c2370f;
  --live: #1f8a4c;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --paper: #121110;
    --card: #1b1a18;
    --ink: #efeae0;
    --muted: #a39d92;
    --line: #2f2c28;
    --signal: #ff6a3d;
    --signal-ink: #ff8a63;
    --live: #4cc983;
  }
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 4px; }
h1, h2, p { margin: 0; }

.wrap { max-width: 1040px; margin: 0 auto; padding-inline: 20px; }

/* header */
.top { display: flex; align-items: center; justify-content: space-between; padding-block: 28px; }
.mark { font: 800 1.6rem/1 var(--sans); letter-spacing: -0.05em; text-decoration: none; }
.mark .dot { color: var(--signal); }
.top nav { display: flex; gap: 24px; font: 500 0.9rem var(--mono); }
.top nav a { text-decoration: none; color: var(--muted); }
.top nav a:hover { color: var(--ink); }

/* hero */
.hero { padding-block: 72px 96px; }
.kicker { font: 500 0.82rem var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); margin-bottom: 22px; }
.hero h1 { font-size: clamp(2.6rem, 7.5vw, 5.6rem); font-weight: 800; line-height: 0.98; letter-spacing: -0.045em; max-width: 14ch; text-wrap: balance; }
.hl { color: var(--signal); }
.lead { margin-top: 28px; font-size: clamp(1.1rem, 2vw, 1.3rem); color: var(--muted); max-width: 46ch; }

/* apps */
.apps { border-top: 2px solid var(--ink); }
.app { display: grid; grid-template-columns: 120px 1fr; gap: 24px; padding-block: 48px; border-bottom: 1px solid var(--line); }
.num { font: 700 clamp(2.4rem, 5vw, 3.6rem)/1 var(--mono); color: var(--signal); letter-spacing: -0.04em; }
.body { display: flex; flex-direction: column; gap: 14px; max-width: 64ch; }
.head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 16px; }
.app h2 { font-size: clamp(1.8rem, 3.6vw, 2.5rem); font-weight: 800; letter-spacing: -0.035em; line-height: 1.05; }
.tag { font-size: 1.2rem; font-weight: 600; line-height: 1.35; }
.body > p:not(.tag) { color: var(--muted); }

.status { font: 500 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; padding: 4px 10px; border-radius: 999px; border: 1px solid currentColor; white-space: nowrap; }
.status.live { color: var(--live); }
.status.live::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: currentColor; margin-right: 7px; vertical-align: 1px; }
.status.dev { color: var(--muted); border-style: dashed; }

.links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 10px; background: var(--ink); color: var(--paper); text-decoration: none; font-weight: 600; font-size: 0.95rem; }
.btn:hover { background: var(--signal); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }

/* translator example */
.convo { margin-top: 8px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; display: flex; flex-direction: column; gap: 12px; }
.line { display: flex; flex-direction: column; gap: 2px; }
.who { font: 500 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.said { font-size: 1.15rem; font-weight: 600; }
.heard { display: flex; flex-direction: column; gap: 6px; padding-left: 16px; border-left: 2px solid var(--signal); }
.heard b { font: 500 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--signal-ink); margin-right: 8px; }

/* footer */
.foot { padding-block: 28px 40px; margin-top: 64px; font: 0.85rem var(--mono); color: var(--muted); }

@media (max-width: 640px) {
  .hero { padding-block: 40px 64px; }
  .app { grid-template-columns: 1fr; gap: 12px; padding-block: 36px; }
}

/* 404 */
.nf { min-height: 70vh; display: flex; flex-direction: column; justify-content: center; gap: 20px; }
.nf h1 { font: 800 clamp(4rem, 14vw, 9rem)/0.9 var(--mono); color: var(--signal); letter-spacing: -0.06em; }
.nf p { font-size: 1.2rem; color: var(--muted); }
.nf a { font-weight: 600; }