:root {
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --paper: #f5f5f7;
  --white: #ffffff;
  --line: #d2d2d7;
  --line-soft: #e8e8ed;
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --blue-soft: #edf6ff;
  --danger: #b42318;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.skip-link { position: fixed; z-index: 100; top: .75rem; left: .75rem; transform: translateY(-180%); padding: .65rem 1rem; background: var(--white); border-radius: 10px; }
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 56px;
  padding: 0 max(1.25rem, calc((100vw - 980px) / 2));
  border-bottom: 1px solid rgba(0, 0, 0, .1);
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(20px);
}
.brand { text-decoration: none; font-size: .95rem; font-weight: 650; letter-spacing: -.01em; }
.header-meta { display: flex; align-items: center; color: var(--ink); font-size: .95rem; font-weight: 650; letter-spacing: -.01em; }
.header-meta strong { color: inherit; font-weight: inherit; }

main { padding: 1rem 0 5rem; }
.intake, footer { width: min(980px, calc(100% - 2.5rem)); margin-left: auto; margin-right: auto; }
h1, h2, h3 { margin: 0; line-height: 1.08; letter-spacing: -.04em; }
h1 { font-size: clamp(1.8rem, 4vw, 2.45rem); font-weight: 700; }
h2 { font-size: clamp(1.8rem, 4vw, 2.35rem); font-weight: 680; }
h3 { font-size: 1.35rem; }
.section-kicker { margin: 0 0 .75rem; color: var(--muted); font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }

.intake { padding: clamp(1.25rem, 4vw, 3.5rem); border: 1px solid var(--line-soft); border-radius: 28px; background: var(--white); box-shadow: 0 10px 40px rgba(0, 0, 0, .045); }
.human-review { margin-bottom: 2.25rem; padding-bottom: 2rem; border-bottom: 1px solid var(--line-soft); }
.human-review h1 { max-width: 790px; margin-bottom: .8rem; }
.human-review > p { max-width: 790px; margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.6; }
.human-review > .service-scope { margin-top: .65rem; }
.form-heading { display: flex; justify-content: space-between; align-items: end; gap: 2rem; margin-bottom: 2rem; }
.form-heading > p { max-width: 300px; margin: 0; color: var(--muted); text-align: right; font-size: .9rem; }
fieldset { min-width: 0; margin: 0; padding: 0; border: 0; }
.form-step { display: block; margin-bottom: 2.5rem; padding-bottom: 2.5rem; border-bottom: 1px solid var(--line-soft); }
.form-step:last-of-type { margin-bottom: 0; border-bottom: 0; }
legend { margin: 0 0 .4rem; padding: 0; font-size: 1.65rem; font-weight: 650; letter-spacing: -.025em; }
.step-intro { margin: 0 0 2rem; color: var(--muted); }
label, .group-label { display: grid; gap: .55rem; margin: 0 0 1.2rem; color: var(--ink); font-size: .9rem; font-weight: 600; }
.group-label span, label > span:not(.optional) { color: var(--danger); }
.optional { color: var(--muted); font-size: .76rem; font-weight: 500; }
input, select, textarea { width: 100%; min-height: 50px; padding: .8rem .9rem; border: 1px solid var(--line); border-radius: 11px; outline: none; background: var(--white); color: var(--ink); }
textarea { resize: vertical; }
input::placeholder, textarea::placeholder { color: #86868b; }
input:hover, select:hover, textarea:hover { border-color: #a1a1a6; }
input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(0, 113, 227, .12); }
input:invalid[aria-invalid="true"], select:invalid[aria-invalid="true"] { border-color: var(--danger); }
.field-grid { display: grid; gap: 1rem; }
.field-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.field-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.certification-fields { align-items: start; }
.measurement-row { display: grid; grid-template-columns: 1fr 110px 1fr 110px; gap: .75rem; }
.field-error { min-height: 1.4rem; color: var(--danger); font-size: .85rem; font-weight: 600; }

.goal-options, .tank-options { display: grid; gap: .65rem; }
.goal-options { margin-bottom: .4rem; }
.tank-options { margin-bottom: 1rem; }
.choice-card {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  margin: 0;
  padding: .95rem 1rem;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--white);
  cursor: pointer;
  font-weight: 500;
  line-height: 1.45;
}
.choice-card:hover { border-color: #a1a1a6; }
.choice-card:has(input:checked) { border-color: var(--blue); background: var(--blue-soft); }
.choice-card input { flex: 0 0 auto; width: 18px; min-height: 18px; margin-top: .14rem; accent-color: var(--blue); }
.choice-card > span { color: var(--ink) !important; }
.tank-option-with-details { display: grid; gap: .65rem; }
.tank-details { margin: 0 0 .25rem 2.55rem; }
.tank-details label { margin-bottom: 0; }
.tank-details label > span { color: var(--ink) !important; }
.size-input { display: grid; grid-template-columns: minmax(0, 1fr) 130px; gap: .75rem; }
.pricing-note { margin: 0; color: var(--muted); font-size: .82rem; }
.payment-methods { margin: .75rem 0 0; color: var(--muted); font-size: .82rem; text-align: right; }
.refund-policy { margin: 1rem 0 0; color: var(--muted); font-size: .8rem; line-height: 1.55; }
.refund-policy strong { color: var(--ink); }

.agency-grid { display: grid; gap: .5rem; margin-bottom: 1.2rem; }
.agency-row { display: grid; gap: .5rem; }
.agency-row-four { grid-template-columns: repeat(4, 1fr); }
.agency-row-two { grid-template-columns: repeat(2, 1fr); }
.agency-row-single { grid-template-columns: 1fr; }
.agency-row label, .segmented label { display: block; position: relative; margin: 0; cursor: pointer; }
.agency-row input, .segmented input { position: absolute; width: 1px; height: 1px; min-height: 1px; opacity: 0; pointer-events: none; }
.agency-row span, .segmented span {
  display: grid;
  place-items: center;
  min-height: 44px;
  padding: .55rem .65rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink) !important;
  background: var(--white);
  font-size: .86rem;
  font-weight: 600;
  text-align: center;
  transition: border-color .15s ease, background .15s ease, color .15s ease;
}
.agency-row label:hover span, .segmented label:hover span { border-color: #a1a1a6; }
.agency-row input:checked + span, .segmented input:checked + span { border-color: var(--blue); background: var(--blue-soft); color: #0058b0 !important; box-shadow: inset 0 0 0 1px var(--blue); }
.agency-row input:focus-visible + span, .segmented input:focus-visible + span { outline: 3px solid rgba(0, 113, 227, .18); outline-offset: 2px; }
.segmented { display: grid; gap: .5rem; margin-bottom: 1.2rem; }
.two-options { grid-template-columns: repeat(2, 1fr); }
.five-options { grid-template-columns: repeat(5, 1fr); }

.checkbox-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; margin-bottom: 1.75rem; }
.checkbox-list label, .radio-stack label { display: flex; align-items: center; gap: .75rem; margin: 0; padding: .85rem 1rem; border: 1px solid var(--line); border-radius: 11px; background: var(--white); cursor: pointer; }
.checkbox-list label:has(input:checked), .radio-stack label:has(input:checked) { border-color: var(--blue); background: var(--blue-soft); }
.checkbox-list input, .radio-stack input, .consent input { flex: 0 0 auto; width: 18px; min-height: 18px; accent-color: var(--blue); }
.checkbox-list span { color: var(--ink) !important; }
.radio-stack { display: grid; grid-template-columns: repeat(2, 1fr); gap: .6rem; margin-bottom: 1.5rem; }
.radio-stack label { align-items: start; }
.radio-stack label > span { display: grid; gap: .15rem; color: var(--ink); }
.radio-stack small { color: var(--muted); font-weight: 400; line-height: 1.4; }
.consent { display: flex; align-items: start; gap: .7rem; color: var(--muted); font-weight: 400; }
.consent span { color: inherit !important; }
.consent strong { color: var(--danger); }
.disclaimer { margin: 1.5rem 0; padding: 1.1rem 1.2rem; border: 1px solid var(--line-soft); border-radius: 12px; background: var(--paper); }
.disclaimer strong { display: block; margin-bottom: .35rem; font-size: .9rem; }
.disclaimer p { margin: 0; color: var(--muted); font-size: .86rem; }

.order-card { display: flex; justify-content: space-between; gap: 1rem; align-items: center; margin-top: 1.5rem; padding: 1.1rem 1.2rem; border: 1px solid var(--line-soft); border-radius: 13px; background: var(--paper); }
.order-card div { display: grid; }
.order-card small { color: var(--muted); }
.order-card > strong { font-size: 1rem; }
.configuration-note { margin-top: 1rem; padding: .9rem 1rem; border-radius: 10px; background: #fff7e6; color: #6f4d00; font-size: .86rem; }
.form-actions { display: flex; justify-content: flex-end; gap: 1rem; margin-top: 1.5rem; padding-top: 1.5rem; border-top: 1px solid var(--line-soft); }
.form-actions .button-primary { margin-left: auto; }

.button { min-height: 46px; display: inline-flex; justify-content: center; align-items: center; gap: .6rem; padding: .7rem 1.2rem; border: 1px solid transparent; border-radius: 999px; cursor: pointer; text-decoration: none; font-weight: 600; transition: background .15s ease, border-color .15s ease; }
.button:focus-visible { outline: 3px solid rgba(0, 113, 227, .2); outline-offset: 2px; }
.button-primary { background: var(--blue); color: var(--white); }
.button-primary:hover { background: var(--blue-hover); }
.button-quiet { border-color: var(--line); background: var(--white); color: var(--ink); }
.button-quiet:hover { background: var(--paper); }
.button:disabled { cursor: not-allowed; opacity: .52; }

footer { display: grid; grid-template-columns: .7fr 1.3fr; gap: 2rem; align-items: start; margin-top: 3.5rem; padding: 2rem 0; border-top: 1px solid var(--line); }
footer p { margin: 0; color: var(--muted); }
.fine-print { font-size: .78rem; }

dialog { width: min(720px, calc(100% - 2rem)); max-height: calc(100vh - 2rem); overflow: auto; padding: clamp(1.3rem, 4vw, 2.5rem); border: 0; border-radius: 22px; color: var(--ink); box-shadow: 0 30px 100px rgba(0, 0, 0, .25); }
dialog::backdrop { background: rgba(0, 0, 0, .42); backdrop-filter: blur(5px); }
.dialog-close { position: absolute; top: 1rem; right: 1rem; width: 36px; height: 36px; border: 0; border-radius: 50%; background: var(--paper); color: var(--muted); cursor: pointer; font-size: 1.35rem; }
.dialog-copy { color: var(--muted); }
.review-summary { margin: 1.5rem 0; border-top: 1px solid var(--line-soft); }
.summary-row { display: grid; grid-template-columns: 160px 1fr; gap: 1rem; padding: .75rem 0; border-bottom: 1px solid var(--line-soft); }
.summary-row dt { color: var(--muted); font-size: .82rem; font-weight: 600; }
.summary-row dd { margin: 0; font-size: .9rem; }
.dialog-actions { display: flex; justify-content: flex-end; gap: .75rem; flex-wrap: wrap; }

@media (max-width: 760px) {
  .site-header { padding: 0 1rem; }
  .form-heading { display: grid; }
  .form-heading > p { text-align: left; }
  .field-grid.two, .field-grid.three, .radio-stack { grid-template-columns: 1fr; }
  .size-input { grid-template-columns: minmax(0, 1fr) 120px; }
  .measurement-row { grid-template-columns: 1fr 100px; }
  .certification-fields { grid-template-columns: 1fr; }
  footer { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .intake, footer { width: min(100% - 1.25rem, 980px); }
  .site-header { gap: .5rem; }
  .brand { font-size: .82rem; }
  .header-meta { font-size: .82rem; white-space: nowrap; }
  .intake { padding: 1.2rem; border-radius: 20px; }
  .agency-row-four { grid-template-columns: repeat(2, 1fr); }
  .five-options { grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .3rem; }
  .five-options span { min-height: 42px; padding: .45rem .15rem; font-size: .78rem; }
  .checkbox-list { grid-template-columns: 1fr; }
  .tank-details { margin-left: 0; }
  .order-card { align-items: start; }
  .payment-methods { text-align: left; }
  .form-actions .button { width: 100%; }
  .summary-row { grid-template-columns: 1fr; gap: .2rem; }
  .dialog-actions .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}