:root {
  --ink: #16202b;
  --muted: #5c6b7a;
  --line: #e3e8ee;
  --bg: #f6f8fb;
  --card: #ffffff;
  --brand: #0d6d68;      /* teal — trustworthy, not HVAC-red */
  --brand-dk: #0a544f;
  --good: #1a7f4b;
  --good-bg: #e7f6ee;
  --neutral: #5c6b7a;
  --neutral-bg: #eef1f5;
  --caution: #a8680a;
  --caution-bg: #fdf3e2;
  --alert: #b3261e;
  --alert-bg: #fce8e6;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16,32,43,.05), 0 6px 20px rgba(16,32,43,.06);
}
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--ink); background: var(--bg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 18px; }
a { color: var(--brand); }

/* header / hero */
header.hero { background: linear-gradient(160deg, #0d6d68, #0a544f); color: #fff; padding: 40px 0 34px; }
header.hero .wrap { text-align: center; }
.badge { display: inline-block; background: rgba(255,255,255,.16); border: 1px solid rgba(255,255,255,.25);
  padding: 5px 12px; border-radius: 999px; font-size: 13px; font-weight: 600; letter-spacing: .02em; }
header.hero h1 { font-size: clamp(26px, 5vw, 38px); line-height: 1.15; margin: 16px 0 8px; }
header.hero p.sub { font-size: 17px; opacity: .92; margin: 0 auto; max-width: 560px; }

/* form card */
main { padding: 24px 0 60px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px; margin: 0 0 18px; }
.card h2 { margin: 0 0 4px; font-size: 20px; }
.card h3 { margin: 0 0 10px; font-size: 18px; }
.card > p.lead { margin: 0 0 18px; color: var(--muted); }

form .grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
form label.field { display: flex; flex-direction: column; gap: 5px; font-size: 14px; font-weight: 600; }
form label.field span.hint { font-weight: 400; color: var(--muted); font-size: 12.5px; }
form input, form select { font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px;
  background: #fff; color: var(--ink); width: 100%; }
form input:focus, form select:focus { outline: 2px solid var(--brand); border-color: var(--brand); }
.full { grid-column: 1 / -1; }

fieldset { border: 1px solid var(--line); border-radius: 10px; margin: 18px 0 0; padding: 14px 16px; }
fieldset legend { font-weight: 600; font-size: 14px; padding: 0 6px; }
.check-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 14px; margin-top: 6px; }
label.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; font-weight: 400; cursor: pointer; }
label.check input { width: auto; margin-top: 3px; }

.btn { display: inline-block; background: var(--brand); color: #fff; border: 0; border-radius: 10px;
  padding: 14px 22px; font: inherit; font-weight: 700; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--brand-dk); }
button.btn.wide { width: 100%; margin-top: 18px; font-size: 17px; }

.link-btn { background: none; border: 0; color: var(--brand); font: inherit; font-weight: 600; cursor: pointer; padding: 0; text-decoration: underline; }

/* results */
.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13.5px; }
.fineprint { font-size: 12.5px; color: var(--muted); margin: 10px 0 0; }

.verdict .verdict-band { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 6px;
  padding-bottom: 12px; margin-bottom: 12px; border-bottom: 1px solid var(--line); }
.verdict-label { font-size: 13.5px; color: var(--muted); font-weight: 600; }
.verdict-range { font-size: clamp(22px, 5vw, 30px); font-weight: 800; letter-spacing: -.01em; }
.verdict h3 { font-size: 19px; }
.verdict-good { border-left: 5px solid var(--good); }
.verdict-neutral { border-left: 5px solid var(--neutral); }
.verdict-caution { border-left: 5px solid var(--caution); }
.verdict-alert { border-left: 5px solid var(--alert); }
details.how { margin-top: 12px; }
details.how summary { cursor: pointer; font-size: 14px; font-weight: 600; color: var(--brand); }
details.how p { margin: 10px 0 0; }

.signals { display: flex; flex-direction: column; gap: 12px; }
.signal { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.signal-head { display: flex; align-items: center; gap: 10px; margin-bottom: 4px; flex-wrap: wrap; }
.signal p { margin: 0; font-size: 14.5px; }
.detail { margin-top: 14px; font-size: 14px; padding: 12px 14px; background: var(--bg); border-radius: 10px; }

.chip { display: inline-block; font-size: 12px; font-weight: 700; padding: 3px 9px; border-radius: 999px; white-space: nowrap; }
.chip-good { background: var(--good-bg); color: var(--good); }
.chip-neutral { background: var(--neutral-bg); color: var(--neutral); }
.chip-caution { background: var(--caution-bg); color: var(--caution); }
.chip-alert { background: var(--alert-bg); color: var(--alert); }

ul, ol { margin: 6px 0 0; padding-left: 22px; }
ol.questions li, ul li { margin-bottom: 8px; }
table.addons { width: 100%; border-collapse: collapse; margin-top: 6px; font-size: 14.5px; }
table.addons th, table.addons td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); }
table.addons th { color: var(--muted); font-size: 13px; }

/* safety override */
.card.safety { border: 2px solid var(--alert); background: var(--alert-bg); }
.card.safety.urgent { border-color: var(--caution); background: var(--caution-bg); }
.safety-flag { font-weight: 800; font-size: 17px; color: var(--alert); margin-bottom: 8px; }
.card.safety.urgent .safety-flag { color: var(--caution); }
.safety-item { background: #fff; border-radius: 10px; padding: 12px 14px; margin: 12px 0; }
.safety-item h4 { margin: 0 0 6px; }
.safety-item p { margin: 4px 0; font-size: 14.5px; }

/* CTA + affiliate */
.card.cta { background: linear-gradient(160deg, #0d6d68, #0a544f); color: #fff; border: 0; }
.card.cta h3 { color: #fff; }
.card.cta .btn { background: #fff; color: var(--brand-dk); margin: 8px 0 4px; }
.card.cta .btn:hover { background: #eafffb; }
.card.cta .fineprint { color: rgba(255,255,255,.8); }
.amz-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
a.amz { display: inline-block; border: 1px solid var(--line); border-radius: 999px; padding: 8px 14px;
  font-size: 14px; font-weight: 600; text-decoration: none; color: var(--brand-dk); background: var(--bg); }
a.amz:hover { border-color: var(--brand); }

/* SEO content */
.content h2 { font-size: 21px; margin: 26px 0 8px; }
.content h3 { font-size: 17px; margin: 18px 0 6px; }
.content p, .content li { color: #2b3948; }
.faq details { border-bottom: 1px solid var(--line); padding: 12px 0; }
.faq summary { font-weight: 600; cursor: pointer; }
.faq details p { margin: 8px 0 0; }

footer { border-top: 1px solid var(--line); padding: 26px 0 40px; color: var(--muted); font-size: 13px; }
footer .wrap { text-align: center; }
.disclaimer { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; font-size: 13px; color: var(--muted); }

@media (max-width: 560px) {
  form .grid { grid-template-columns: 1fr; }
  .check-grid { grid-template-columns: 1fr; }
}