/* passfar.com — Swiss International.  Tokens are frozen in site/DESIGN.md.
   Hand-written on purpose: no Tailwind CDN, no web fonts, no third-party requests. */

:root {
  --bg: #ffffff;
  --muted: #f5f5f5;
  --rule: #d9d9d9;
  --dim: #797979;
  --fg: #000000;
  --accent: #ff3000;

  --font: "Helvetica Neue", Helvetica, Inter, "Segoe UI", Roboto, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;

  --gut: 1.5rem;
  --maxw: 68rem;
  --readw: 44rem;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  font-weight: 400;
  text-rendering: optimizeLegibility;
}

/* ── grid texture: depth without shadow (constitution §Textures) ───────── */
.grid-pattern {
  background-image:
    linear-gradient(to right, rgba(0,0,0,.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0,0,0,.03) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* ── layout ───────────────────────────────────────────────────────────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut); }
.read { max-width: var(--readw); }
main { display: block; }

section { padding: 3.5rem 0; border-top: 2px solid var(--fg); }
section:first-of-type { border-top: 0; }

/* ── type ─────────────────────────────────────────────────────────────── */
h1, h2, h3, h4 {
  text-transform: uppercase;
  letter-spacing: -0.02em;
  line-height: 1.02;
  margin: 0 0 1rem;
  font-weight: 800;
}
h1 { font-size: clamp(2.4rem, 6.5vw, 5rem); font-weight: 900; }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.5rem); margin-top: 0; }
h3 { font-size: clamp(1.1rem, 2vw, 1.35rem); letter-spacing: 0; }
h4 { font-size: 0.95rem; letter-spacing: 0.06em; }

p { margin: 0 0 1.1rem; }
.lede { font-size: clamp(1.1rem, 2vw, 1.35rem); line-height: 1.45; font-weight: 500; }

.label {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--dim);
  display: block;
  margin-bottom: 0.6rem;
}

.claim {
  border-left: 4px solid var(--accent);
  padding: 0.15rem 0 0.15rem 1.1rem;
  margin: 0 0 1.6rem;
  font-size: clamp(1.05rem, 1.9vw, 1.25rem);
  line-height: 1.45;
  font-weight: 500;
}

small, .src { font-size: 0.8rem; color: var(--dim); line-height: 1.45; }
.src a { color: var(--dim); }

a { color: var(--fg); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--accent); }

ul, ol { margin: 0 0 1.1rem; padding-left: 1.2rem; }
li { margin-bottom: 0.45rem; }

code, .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

/* ── header / footer ──────────────────────────────────────────────────── */
.masthead {
  border-bottom: 2px solid var(--fg);
  padding: 0.9rem 0;
}
.masthead .wrap { display: flex; flex-wrap: wrap; gap: 0.75rem 1.4rem; align-items: baseline; }
.brand {
  font-weight: 900; text-transform: uppercase; letter-spacing: -0.02em;
  font-size: 1.05rem; text-decoration: none; margin-right: auto;
}
.masthead nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.1rem; }
.masthead nav a {
  font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: 0.1em; text-decoration: none; border-bottom: 1px solid transparent;
}
.masthead nav a:hover, .masthead nav a[aria-current="page"] {
  border-bottom-color: var(--accent); color: var(--accent);
}

footer {
  border-top: 2px solid var(--fg);
  padding: 2.5rem 0 3.5rem;
  font-size: 0.85rem;
}
footer nav { display: flex; flex-wrap: wrap; gap: 0.4rem 1.2rem; margin-bottom: 1.2rem; }
footer p { color: var(--dim); max-width: var(--readw); }

/* ── buttons ──────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  border: 2px solid var(--fg);
  background: var(--fg); color: var(--bg);
  padding: 0.7rem 1.4rem;
  font-family: var(--mono); font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.12em;
  text-decoration: none; cursor: pointer;
  transition: background 120ms, color 120ms, transform 120ms;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--fg); }
.btn-ghost:hover { background: var(--fg); border-color: var(--fg); color: var(--bg); }

/* ── tables ───────────────────────────────────────────────────────────── */
.tablewrap { overflow-x: auto; margin: 0 0 1rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
th, td { text-align: left; padding: 0.55rem 0.8rem; border-bottom: 1px solid var(--rule); }
thead th {
  background: var(--muted); border-bottom: 2px solid var(--fg);
  font-family: var(--mono); font-size: 0.68rem;
  text-transform: uppercase; letter-spacing: 0.1em; font-weight: 700;
}
td.n, th.n { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; }
tbody tr:hover { background: var(--muted); }

/* ── blocks ───────────────────────────────────────────────────────────── */
.box { border: 2px solid var(--fg); padding: 1.4rem; }
.box-muted { background: var(--muted); border: 0; border-left: 4px solid var(--fg); padding: 1.1rem 1.3rem; }
.cols { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.cols-2 { display: grid; gap: 2rem; grid-template-columns: 1fr; }
@media (min-width: 52rem) { .cols-2 { grid-template-columns: 1.15fr 1fr; } }

.flag {
  display: inline-block; font-family: var(--mono); font-size: 0.62rem;
  text-transform: uppercase; letter-spacing: 0.1em;
  border: 1px solid var(--accent); color: var(--accent);
  padding: 0.05rem 0.35rem; vertical-align: 1px; white-space: nowrap;
}
.flag-dim { border-color: var(--dim); color: var(--dim); }

/* ── the readout (pass-probability tool) ──────────────────────────────── */
.readout { border: 2px solid var(--fg); padding: 1.6rem; }
.readout .big {
  font-family: var(--mono); font-variant-numeric: tabular-nums;
  font-size: clamp(3rem, 11vw, 5.5rem); font-weight: 700;
  line-height: 0.95; color: var(--accent); display: block;
}
.band {
  position: relative; height: 2.6rem; margin: 1.1rem 0 0.4rem;
  border: 1px solid var(--fg); background: var(--muted);
}
.band .fill { position: absolute; top: 0; bottom: 0; background: rgba(255,48,0,.16); }
.band .pt { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--accent); }
.band .nat { position: absolute; top: -4px; bottom: -4px; width: 1px; background: var(--fg); }
.band .lab {
  position: absolute; bottom: -1.35rem; font-family: var(--mono);
  font-size: 0.62rem; color: var(--dim); transform: translateX(-50%); white-space: nowrap;
}
.scale { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.62rem; color: var(--dim); margin-top: 1.6rem; }

fieldset { border: 1px solid var(--rule); padding: 1rem 1.2rem 1.2rem; margin: 0 0 1.2rem; }
legend { font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.12em; padding: 0 0.4rem; }
label { display: block; font-size: 0.88rem; margin-bottom: 0.9rem; }
label > span { display: block; margin-bottom: 0.25rem; }
input[type="number"], input[type="email"], input[type="text"], select {
  font-family: var(--mono); font-size: 0.95rem;
  border: 2px solid var(--fg); background: var(--bg); color: var(--fg);
  padding: 0.45rem 0.6rem; width: 100%; max-width: 12rem; border-radius: 0;
}
input[type="email"], input[type="text"] { max-width: 22rem; }
input:focus, select:focus, .btn:focus { outline: 3px solid var(--accent); outline-offset: 2px; }
input[type="range"] { width: 100%; max-width: 22rem; accent-color: var(--accent); }

.heat { display: grid; grid-template-columns: repeat(auto-fill, minmax(2.6rem, 1fr)); gap: 3px; }
.heat i {
  display: block; aspect-ratio: 1; border: 1px solid var(--rule);
  font-style: normal; font-family: var(--mono); font-size: 0.5rem;
  color: var(--dim); display: flex; align-items: center; justify-content: center;
}

.note { font-size: 0.88rem; line-height: 1.5; }
.beta {
  font-family: var(--mono); font-size: 0.65rem; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--dim); border: 1px solid var(--dim);
  padding: 0.1rem 0.4rem; display: inline-block;
}

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 0; top: 0; background: var(--fg); color: var(--bg); padding: 0.6rem 1rem; z-index: 9; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}