/* StainLookup — vanilla CSS, no frameworks. Mobile-first. */
:root {
  --ink: #1c2430;
  --muted: #5b6675;
  --bg: #ffffff;
  --wash: #f4f6f8;
  --line: #e2e7ec;
  --brand: #0e6b4f;
  --brand-dark: #0a4f3a;
  --warn: #b3402a;
  --warn-bg: #fdf1ee;
  --radius: 10px;
  --maxw: 760px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; font-family: var(--font); color: var(--ink); background: var(--bg);
  line-height: 1.6; font-size: 17px;
}
a { color: var(--brand); }
a:hover { color: var(--brand-dark); }
header.site {
  border-bottom: 1px solid var(--line); background: var(--bg);
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1rem; }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 0; }
.brand { font-weight: 800; font-size: 1.25rem; text-decoration: none; color: var(--ink); }
.brand span { color: var(--brand); }
nav.links a { margin-left: 1rem; text-decoration: none; color: var(--muted); font-size: 0.95rem; }
nav.links a:hover { color: var(--ink); }
main { padding: 1.5rem 0 3rem; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0.5rem 0 1rem; letter-spacing: -0.01em; }
h2 { font-size: 1.35rem; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }
.lede { color: var(--muted); font-size: 1.1rem; }
.breadcrumb { font-size: 0.85rem; color: var(--muted); margin-bottom: 0.5rem; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---- Lookup tool ---- */
.tool {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--wash); padding: 1.25rem; margin: 1.5rem 0;
}
.tool fieldset { border: 0; padding: 0; margin: 0 0 1rem; }
.tool label { display: block; font-weight: 600; margin-bottom: 0.75rem; }
.tool select, .tool button {
  font-size: 1rem; padding: 0.65rem 0.75rem; border-radius: 8px;
  border: 1px solid var(--line); width: 100%; background: #fff; color: var(--ink);
}
.tool .row { display: grid; gap: 0.75rem; }
@media (min-width: 560px) { .tool .row { grid-template-columns: 1fr 1fr; } }
.seg { display: flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #fff; }
.seg button {
  flex: 1; border: 0; background: #fff; padding: 0.65rem; cursor: pointer;
  font-size: 1rem; color: var(--muted); font-weight: 600;
}
.seg button[aria-pressed="true"] { background: var(--brand); color: #fff; }
.tool .go {
  background: var(--brand); color: #fff; border: 0; font-weight: 700;
  cursor: pointer; margin-top: 0.25rem;
}
.tool .go:hover { background: var(--brand-dark); }
.result { margin-top: 1.25rem; }
.result ol.steps { margin: 0.5rem 0; padding-left: 1.4rem; }
.result ol.steps li { margin-bottom: 0.55rem; }
.notice {
  border-left: 4px solid var(--brand); background: #eaf4ef;
  padding: 0.75rem 1rem; border-radius: 0 8px 8px 0; margin: 1rem 0;
  font-size: 0.95rem;
}
.notice strong { display: block; margin-bottom: 0.15rem; }
.notice.pro { border-left-color: var(--warn); background: var(--warn-bg); }
details.rules { border: 1px solid var(--line); border-radius: var(--radius); padding: 0.75rem 1rem; margin: 1.5rem 0; background: var(--wash); }
details.rules summary { font-weight: 700; cursor: pointer; }
details.rules ul { margin: 0.5rem 0 0.25rem; padding-left: 1.2rem; }
details.rules li { margin-bottom: 0.35rem; font-size: 0.95rem; }
.donts { background: var(--warn-bg); border: 1px solid #f0d5cc; border-radius: 8px; padding: 0.75rem 1rem; margin: 1rem 0; }
.donts h3 { margin: 0 0 0.4rem; color: var(--warn); font-size: 1rem; }
.donts ul { margin: 0; padding-left: 1.2rem; }
.donts li { margin-bottom: 0.35rem; }
.tip { font-size: 0.95rem; color: var(--muted); border-top: 1px dashed var(--line); padding-top: 0.75rem; }

/* ---- Cards / lists ---- */
.cards { display: grid; gap: 0.75rem; margin: 1rem 0; }
@media (min-width: 560px) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 0.9rem 1rem;
  text-decoration: none; color: var(--ink); background: #fff; display: block;
}
.card:hover { border-color: var(--brand); }
.card b { display: block; font-size: 1.02rem; }
.card small { color: var(--muted); }
.stain-list { columns: 2; column-gap: 2rem; padding-left: 1.2rem; }
@media (min-width: 560px) { .stain-list { columns: 3; } }
.stain-list li { margin-bottom: 0.4rem; break-inside: avoid; }
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); padding: 0.75rem 0; }
.faq summary { font-weight: 600; cursor: pointer; }
.faq p { margin: 0.5rem 0 0.25rem; color: var(--ink); }

footer.site {
  border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem;
  padding: 1.5rem 0 2.5rem;
}
footer.site nav a { margin-right: 1rem; color: var(--muted); text-decoration: none; }
footer.site nav a:hover { color: var(--ink); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 0.5rem; top: 0.5rem; background: #fff; padding: 0.5rem; z-index: 99; }