/* ==========================================================
   American Air Duct Cleaning Enid
   Extends the local-design base system.
   Design rules: sharp corners (radius 0), strong hierarchy, high contrast.
   Palette contrast verified: #0B2545 on #FFF = 14.6:1, #FFF on #C8102E = 5.9:1
   ========================================================== */

:root {
  --ink: #0B2545;
  --ink-soft: #14345F;
  --accent: #C8102E;
  --accent-dark: #9E0C24;
  --body: #3A4759;
  --muted: #6B7A8D;
  --line: #D9E1EA;
  --bg: #FFFFFF;
  --bg-alt: #F4F6F8;
  --success: #15803D;
  --error: #B91C1C;

  --font-heading: 'Montserrat', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --fs-h1: clamp(2.25rem, 5vw, 3.75rem);
  --fs-h2: clamp(1.6rem, 3.5vw, 2.4rem);
  --fs-h3: clamp(1.15rem, 2vw, 1.4rem);

  --s-1: .5rem; --s-2: 1rem; --s-3: 1.5rem; --s-4: 2rem;
  --s-5: 3rem; --s-6: 4rem; --s-7: 6rem;

  --container: 1200px;
  --narrow: 820px;
  --radius: 0;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 1rem; line-height: 1.65;
  color: var(--body); background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
img, svg, iframe { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; }
a { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

h1,h2,h3,h4 {
  font-family: var(--font-heading); font-weight: 900; line-height: 1.12;
  color: var(--ink); letter-spacing: -.02em;
}
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 800; letter-spacing: -.01em; }
h4 { font-size: 1rem; font-weight: 800; }
p + p { margin-top: var(--s-2); }

.overline {
  font-size: .75rem; text-transform: uppercase; letter-spacing: .1em;
  font-weight: 800; color: var(--accent); margin-bottom: var(--s-1);
  font-family: var(--font-heading);
}
.lede { font-size: 1.125rem; color: var(--body); }
.mb-3 { margin-bottom: var(--s-3); }
.mt { margin-top: var(--s-3); }
.text-center { text-align: center; }
.sep { opacity: .5; }
.note { font-size: .9375rem; color: var(--muted); margin-top: var(--s-2); }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--s-3); }
.container-narrow { max-width: var(--narrow); }
section { padding-block: var(--s-6); }
@media (min-width: 768px) { section { padding-block: var(--s-7); } }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: #fff; padding: .75rem 1.25rem; text-decoration: none;
}
.skip-link:focus { left: 0; }

/* ---------- announcement + header ---------- */
.announce {
  background: var(--ink); color: #fff; font-size: .8125rem; text-align: center;
  padding-block: .5rem; letter-spacing: .01em;
}
.announce strong { color: #fff; }

.site-header {
  position: sticky; top: 0; z-index: 60; background: #fff;
  border-bottom: 3px solid var(--ink);
}
.site-header > .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-2); min-height: 72px;
}
.site-header .logo { line-height: 0; text-decoration: none; flex-shrink: 0; }
.site-header nav { display: none; gap: var(--s-3); }
.site-header nav a {
  text-decoration: none; font-weight: 700; font-size: .9375rem; color: var(--ink);
}
.site-header nav a:hover { color: var(--accent); }
@media (min-width: 1024px) { .site-header nav { display: flex; } }

.header-call {
  display: inline-flex; align-items: center; gap: .5rem; flex-shrink: 0;
  padding: .7rem 1.1rem; background: var(--accent); color: #fff;
  text-decoration: none; font-weight: 800; font-family: var(--font-heading);
  white-space: nowrap;
}
.header-call:hover { background: var(--ink); color: #fff; }

/* ---------- review bar ---------- */
.review-bar { background: var(--ink-soft); color: #fff; padding-block: .6rem; font-size: .875rem; }
.review-bar .container {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: .5rem 1rem; text-align: center;
}
.review-bar .stars { display: inline-flex; color: #F5B301; }
.review-bar a { color: #fff; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .9rem 1.75rem; font-family: var(--font-heading); font-weight: 800;
  font-size: .9375rem; text-decoration: none; text-transform: uppercase;
  letter-spacing: .04em; border: 3px solid transparent; cursor: pointer;
  transition: background-color .15s, color .15s, border-color .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--ink); color: #fff; }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: #fff; }
.btn-call { background: var(--ink); color: #fff; }
.btn-call:hover { background: var(--accent); color: #fff; }

/* ---------- hero ---------- */
.hero, .page-hero { background: var(--bg-alt); border-bottom: 1px solid var(--line); }
.hero .container, .page-hero .container { display: grid; gap: var(--s-4); }
@media (min-width: 900px) {
  .hero .container, .page-hero .container {
    grid-template-columns: 1.05fr .95fr; gap: var(--s-5); align-items: start;
  }
}
.page-hero.narrow .container { display: block; }
.hero h1, .page-hero h1 { margin-bottom: var(--s-2); }
.subhead { font-size: 1.15rem; margin-bottom: var(--s-3); max-width: 54ch; }
.hero-btns { display: flex; flex-wrap: wrap; gap: var(--s-2); margin-top: var(--s-3); }

/* ---------- photo band ---------- */
.photo-band { background: var(--bg-alt); padding: var(--s-4) 0; }
.photo-band img {
  width: 100%; aspect-ratio: 16 / 9; object-fit: cover;
  border-radius: 10px; border: 1px solid var(--line);
}

ul.ticks { list-style: none; padding: 0; margin: var(--s-3) 0 0; display: grid; gap: .6rem; }
ul.ticks li { position: relative; padding-left: 1.9rem; }
ul.ticks li::before {
  content: ""; position: absolute; left: 0; top: .45em; width: 1.1rem; height: .6rem;
  border-left: 3px solid var(--accent); border-bottom: 3px solid var(--accent);
  transform: rotate(-45deg);
}

/* ---------- forms ---------- */
.lead-form { background: #fff; padding: var(--s-3); border: 3px solid var(--ink); }
.lead-form h2 { font-size: 1.4rem; margin-bottom: .35rem; }
.lead-form .form-sub { font-size: .9375rem; color: var(--muted); margin-bottom: var(--s-2); }
.lead-form .form-row { display: grid; gap: var(--s-2); margin-bottom: var(--s-2); }
.lead-form label { display: block; font-weight: 700; font-size: .875rem; }
.lead-form .req { color: var(--accent); }
.lead-form input, .lead-form select, .lead-form textarea {
  width: 100%; margin-top: .3rem; padding: .8rem; border: 2px solid var(--line);
  background: #fff; color: var(--ink); font-size: 1rem;
}
.lead-form input:focus, .lead-form select:focus, .lead-form textarea:focus {
  border-color: var(--ink); outline: 3px solid var(--accent); outline-offset: 1px;
}
.lead-form textarea { resize: vertical; }
.lead-form .btn { width: 100%; }
.lead-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; }
.lead-form .form-note {
  font-size: .8125rem; color: var(--muted); margin-top: var(--s-2); text-align: center;
}
.form-error { color: var(--error); font-weight: 700; margin-bottom: var(--s-2); }
.form-success { border: 3px solid var(--success); padding: var(--s-3); background: #fff; }
.form-success h3 { color: var(--success); margin-bottom: .5rem; }

.midform { background: var(--ink); }
.midform .lead-form { border-color: var(--accent); }

/* ---------- trust bar ---------- */
.trust-bar { background: var(--ink); color: #fff; padding-block: var(--s-3); }
.trust-bar ul {
  list-style: none; padding: 0; margin: 0; display: grid;
  grid-template-columns: repeat(2, 1fr); gap: var(--s-3); text-align: center;
}
@media (min-width: 900px) { .trust-bar ul { grid-template-columns: repeat(5, 1fr); } }
.trust-bar li { font-weight: 600; font-size: .875rem; line-height: 1.35; }
.trust-bar li span {
  display: block; font-family: var(--font-heading); font-weight: 900;
  font-size: 1.35rem; color: #fff; margin-bottom: .25rem; letter-spacing: -.01em;
}

/* ---------- services grid ---------- */
.services { background: var(--bg); }
.services-grid { display: grid; grid-template-columns: 1fr; gap: var(--s-2); }
@media (min-width: 640px) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .services-grid { grid-template-columns: repeat(3, 1fr); } }
.service-card {
  display: block; padding: var(--s-3); background: #fff; border: 2px solid var(--line);
  text-decoration: none; color: inherit; transition: border-color .15s, background .15s;
}
.service-card:hover { border-color: var(--ink); background: var(--bg-alt); }
.service-card h3 { margin-bottom: .4rem; }
.service-card p { font-size: .9375rem; color: var(--body); }
.service-card .arrow {
  display: inline-block; margin-top: var(--s-2); font-weight: 800;
  color: var(--accent); font-family: var(--font-heading); font-size: .875rem;
  text-transform: uppercase; letter-spacing: .04em;
}

/* ---------- topic + inclusion grids ---------- */
.topics { background: var(--bg-alt); }
.topics + .topics { background: var(--bg); }
.topic-grid, .inc-grid { display: grid; gap: var(--s-3); margin-top: var(--s-4); }
@media (min-width: 700px) { .topic-grid, .inc-grid { grid-template-columns: repeat(2, 1fr); } }
.topic, .inc { border-left: 4px solid var(--accent); padding-left: var(--s-3); }
.topic h3, .inc h3 { margin-bottom: .5rem; }
.topic p, .inc p { font-size: .9375rem; }

.intro { padding-block: var(--s-5); }
.intro .lede { font-size: 1.2rem; }

/* ---------- process ---------- */
.process { background: var(--bg-alt); }
.steps { list-style: none; padding: 0; margin: var(--s-4) 0 0; display: grid; gap: var(--s-3); }
@media (min-width: 900px) { .steps { grid-template-columns: repeat(2, 1fr); } }
.steps li { display: flex; gap: var(--s-2); align-items: flex-start; }
.steps .num {
  flex-shrink: 0; width: 2.5rem; height: 2.5rem; background: var(--ink); color: #fff;
  display: grid; place-items: center; font-family: var(--font-heading);
  font-weight: 900; font-size: 1.1rem;
}
.steps h3 { margin-bottom: .35rem; }
.steps p { font-size: .9375rem; }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; margin-top: var(--s-4); border: 2px solid var(--line); }
table { width: 100%; border-collapse: collapse; min-width: 640px; background: #fff; }
th, td { padding: .9rem 1rem; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th {
  background: var(--ink); color: #fff; font-family: var(--font-heading);
  font-weight: 800; font-size: .8125rem; text-transform: uppercase; letter-spacing: .06em;
}
tbody th { font-weight: 800; color: var(--ink); width: 22%; }
tbody td { font-size: .9375rem; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }

/* ---------- why ---------- */
.why { background: var(--bg); }
.why-grid { display: grid; gap: var(--s-3); }
@media (min-width: 900px) { .why-grid { grid-template-columns: repeat(3, 1fr); } }
.why-card { border-top: 5px solid var(--accent); padding-top: var(--s-3); }
.why-card h3 { margin-bottom: .5rem; }
.why-card p { font-size: .9375rem; }

/* ---------- proof ---------- */
.reviews { background: var(--bg-alt); }
.proof-grid { display: grid; gap: var(--s-3); }
@media (min-width: 900px) { .proof-grid { grid-template-columns: 1.3fr 1fr 1fr; } }
.proof-card { background: #fff; border: 2px solid var(--line); padding: var(--s-3); }
.proof-card.featured { border-color: var(--ink); border-width: 3px; }
.proof-card h3 { margin-bottom: .5rem; }
.proof-card p { font-size: .9375rem; }
.proof-card .stars { display: inline-flex; color: #F5B301; margin-bottom: .5rem; }
.review-card { background: #fff; border: 2px solid var(--line); padding: var(--s-3); }
.review-card blockquote { font-style: italic; margin-bottom: var(--s-2); }
.review-card cite { font-style: normal; font-weight: 800; display: block; color: var(--ink); }
.review-card cite span { display: block; font-weight: 400; font-size: .875rem; color: var(--muted); }

/* ---------- faq ---------- */
.faq { background: var(--bg); }
.faq details { border-bottom: 2px solid var(--line); padding-block: var(--s-2); }
.faq summary {
  font-family: var(--font-heading); font-weight: 800; font-size: 1.0625rem;
  color: var(--ink); cursor: pointer; list-style: none; position: relative;
  padding-right: 2.5rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+'; position: absolute; right: 0; top: -.15em; font-size: 1.6rem;
  color: var(--accent); line-height: 1;
}
.faq details[open] summary::after { content: '\2212'; }
.faq details p { margin-top: var(--s-2); font-size: .9375rem; }

/* ---------- prose / legal ---------- */
.prose h2 { margin-top: var(--s-4); margin-bottom: var(--s-2); font-size: 1.5rem; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin-bottom: var(--s-2); }
.legal p { font-size: .9375rem; }

/* ---------- contact ---------- */
.contact-grid { display: grid; gap: var(--s-4); }
@media (min-width: 900px) { .contact-grid { grid-template-columns: 1fr 1fr; gap: var(--s-5); } }
.contact-sec address { font-style: normal; margin-block: var(--s-2); line-height: 1.7; }
.contact-sec h3 { margin-top: var(--s-3); margin-bottom: .35rem; }
.big-call { margin-block: var(--s-3); }
.map-wrap { border: 3px solid var(--ink); margin-top: var(--s-2); }
.map-wrap iframe { width: 100%; height: 340px; border: 0; }

/* ---------- map ---------- */
.map-sec { background: var(--bg); }
.map-sec.alt-bg { background: var(--bg-alt); }
.map-grid { display: grid; gap: var(--s-4); align-items: center; }
@media (min-width: 900px) { .map-grid { grid-template-columns: .9fr 1.1fr; gap: var(--s-5); } }
.map-sec address { font-style: normal; margin-top: var(--s-3); line-height: 1.7; }

.area-list { margin-top: var(--s-2); font-size: .9375rem; color: var(--muted); }
.area { background: var(--bg-alt); }

/* ---------- cta band ---------- */
.cta-band { background: var(--ink); color: #fff; text-align: center; }
.cta-band h2 { color: #fff; margin-bottom: var(--s-2); }
.cta-band p { font-size: 1.125rem; margin-bottom: var(--s-3); }
.cta-band .cta-phone { margin-top: var(--s-3); margin-bottom: 0; font-size: 1rem; }
.cta-band a { color: #fff; font-weight: 800; }
.cta-band .btn-primary { color: #fff; }

/* ---------- breadcrumbs ---------- */
.breadcrumbs { padding-block: var(--s-2); font-size: .8125rem; color: var(--muted); background: #fff; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--ink); }
.breadcrumbs span[aria-current] { color: var(--ink); font-weight: 700; }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: #fff; padding-block: var(--s-5) var(--s-3); font-size: .9375rem; }
.site-footer a { color: #fff; }
.site-footer a:hover { color: #fff; text-decoration: none; }
.site-footer h4 {
  color: #fff; margin-bottom: var(--s-2); font-size: .8125rem;
  text-transform: uppercase; letter-spacing: .08em;
}
.site-footer h4.mt { margin-top: var(--s-3); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .45rem; }
.site-footer address { font-style: normal; margin-top: var(--s-2); line-height: 1.7; }
.site-footer .tagline { margin-top: var(--s-2); color: rgba(255,255,255,.8); }
.site-footer .area { color: rgba(255,255,255,.8); background: none; padding: 0; }
.footer-grid { display: grid; gap: var(--s-4); }
@media (min-width: 900px) { .footer-grid { grid-template-columns: 2fr 1.2fr 1fr 1.2fr; } }
.footer-bottom {
  margin-top: var(--s-4); padding-top: var(--s-3);
  border-top: 1px solid rgba(255,255,255,.18); display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: var(--s-2); font-size: .8125rem; color: rgba(255,255,255,.7);
}
.footer-bottom a { color: rgba(255,255,255,.85); }

/* ---------- sticky mobile cta + fab ---------- */
.mobile-cta {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
  display: grid; grid-template-columns: 1fr 1fr;
  padding-bottom: env(safe-area-inset-bottom);
  transform: translateY(110%); transition: transform .25s ease;
}
.mobile-cta.visible { transform: translateY(0); }
.mobile-cta a {
  padding: 1.05rem .5rem; text-align: center; text-decoration: none; font-weight: 800;
  text-transform: uppercase; font-size: .9375rem; font-family: var(--font-heading);
  letter-spacing: .04em;
}
.mobile-cta .call { background: var(--ink); color: #fff; }
.mobile-cta .quote { background: var(--accent); color: #fff; }
@media (min-width: 768px) { .mobile-cta { display: none; } }

.fab {
  position: fixed; right: 1.25rem; bottom: 1.25rem; z-index: 90;
  width: 3.5rem; height: 3.5rem; background: var(--accent); color: #fff;
  display: none; place-items: center; text-decoration: none;
  box-shadow: 0 2px 12px rgba(11,37,69,.35);
}
.fab:hover { background: var(--ink); color: #fff; }
.fab.visible { display: grid; }
@media (max-width: 767px) { .fab { display: none !important; } }

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