/* solo-probe — mobile-first, no framework. Contrast: every text/background pair below is >= 4.5:1 (AA). */
:root {
  --ink: #1f2937;        /* on #fff: 14.7:1 */
  --muted: #4b5563;      /* on #fff: 7.6:1 */
  --bg: #ffffff;
  --soft: #f5f5f4;
  --line: #d6d3d1;
  --accent: #9a3412;     /* paint (rust): white on it 7.3:1 */
  --accent-soft: #fff7ed;
  --error: #b91c1c;      /* on #fff: 6.5:1 */
  --radius: 10px;
}
.p-detail { --accent: #0e7490; --accent-soft: #ecfeff; } /* detail (teal): white on it 5.4:1 */

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; } /* .field/.btn set display; the hidden attribute must still win */
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); background: var(--bg);
  font: 400 1.0625rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
h1, h2, h3 { line-height: 1.2; margin: 0 0 .6em; }
h1 { font-size: clamp(1.75rem, 6vw, 2.75rem); letter-spacing: -.01em; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
a { color: var(--accent); text-underline-offset: 3px; }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: 100%; max-width: 68rem; margin: 0 auto; padding: 0 1.25rem; }
.narrow { max-width: 42rem; }

.top { border-bottom: 1px solid var(--line); }
.top-inner { display: flex; align-items: center; justify-content: space-between; min-height: 3.5rem; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--accent); }
.lang { font-weight: 600; padding: .5rem .25rem; }

.hero { background: var(--accent-soft); padding: 2.5rem 0 3rem; }
.eyebrow {
  display: inline-block; font-size: .875rem; font-weight: 700; color: var(--accent);
  border: 1px solid currentColor; border-radius: 999px; padding: .2rem .75rem; margin-bottom: 1rem;
}
.sub { font-size: 1.125rem; color: var(--muted); max-width: 46rem; }

.btn {
  display: inline-block; min-height: 3rem; padding: .8rem 1.4rem; border: 0; border-radius: var(--radius);
  background: var(--accent); color: #fff; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(.92); }
.btn:disabled { opacity: .7; cursor: progress; }

.pains { padding: 2.5rem 0 1rem; }
.pains ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.pains li { border-left: 4px solid var(--accent); padding: .25rem 0 .25rem 1rem; color: var(--muted); }

.features { padding: 1.5rem 0 2.5rem; }
.grid { display: grid; gap: 1rem; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; background: var(--bg); }
.card h2 { font-size: 1.1rem; }
.card p { color: var(--muted); margin: 0; }

.calc { border: 2px solid var(--accent); border-radius: calc(var(--radius) + 4px); padding: 1.5rem 1.25rem; margin: 1rem 0 3rem; }
.calc-grid { display: grid; gap: 1.5rem; }
.field { display: grid; gap: .35rem; margin: 0 0 1rem; border: 0; padding: 0; min-width: 0; }
.field label, .field legend { font-weight: 600; }
.unit { font-weight: 400; color: var(--muted); }
input[type="text"], input[type="email"], input[type="number"], select {
  width: 100%; min-height: 3rem; padding: .6rem .75rem; font: inherit; color: var(--ink);
  background: var(--bg); border: 1px solid #78716c; border-radius: 8px;
}
.check { display: flex; align-items: center; gap: .6rem; font-weight: 400; min-height: 2.75rem; }
.check input { width: 1.25rem; height: 1.25rem; accent-color: var(--accent); }
.calc-result { background: var(--soft); border-radius: var(--radius); padding: 1.25rem; align-self: start; }
.calc-result dl { margin: 0; }
.result-row { display: flex; justify-content: space-between; gap: 1rem; padding: .6rem 0; border-bottom: 1px solid var(--line); }
.result-row:last-child { border-bottom: 0; }
.result-row dt { color: var(--muted); }
.result-row dd { margin: 0; font-weight: 800; font-size: 1.25rem; font-variant-numeric: tabular-nums; text-align: right; }
.fine { font-size: .9rem; color: var(--muted); margin-top: 1rem; }

.waitlist { background: var(--soft); padding: 2.5rem 0; }
.forget { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid currentColor; border-top-color: color-mix(in srgb, var(--muted) 30%, transparent); font-size: .9rem; }
.forget h3 { font-size: 1rem; margin: 0 0 .75rem; }
.btn-quiet { min-height: 2.75rem; background: transparent; color: inherit; border: 1px solid var(--muted); font-weight: 600; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.status { margin: 1rem 0 0; font-weight: 600; }
.status:empty { display: none; }
.status.is-error { color: var(--error); }

.faq { padding: 2.5rem 0; }
details { border-bottom: 1px solid var(--line); padding: .9rem 0; }
summary { cursor: pointer; font-weight: 700; min-height: 2rem; }
details p { margin: .6rem 0 0; color: var(--muted); }

.foot { border-top: 1px solid var(--line); padding: 1.5rem 0 2.5rem; font-size: .9rem; color: var(--muted); }

@media (min-width: 48rem) {
  .hero { padding: 4rem 0; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .pains ul { grid-template-columns: repeat(3, 1fr); }
  .calc { padding: 2rem; }
  .calc-grid { grid-template-columns: 3fr 2fr; }
}
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }