/* 00  Core — resets and behaviour hooks only. Every visual decision for this
       site lives in the sections below, starting with the design tokens.    */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; }
img, svg, iframe, video { display: block; max-width: 100%; }
img { height: auto; }
iframe { border: 0; }
figure { margin: 0; }
[hidden] { display: none !important; }
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.skip-link { position: absolute; left: 0.5rem; top: 0.5rem; z-index: 999; transform: translateY(-160%); padding: 0.8rem 1.2rem; background: #000; color: #fff; font-weight: 700; text-decoration: none; }
.skip-link:focus { transform: none; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.nav-toggle .icon-close, .nav-toggle[aria-expanded="true"] .icon-open { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }
summary { cursor: pointer; }
summary::-webkit-details-marker { display: none; }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.field { display: flex; flex-direction: column; gap: 0.3rem; min-width: 0; }
.field__error { margin: 0; min-height: 1rem; font-size: 0.82rem; font-weight: 700; color: var(--err); }
.field.is-invalid :where(input, select, textarea) { border-color: var(--err); }
.form-status { min-height: 1.2rem; font-weight: 700; }
.form-status.is-error { color: var(--err); }
.form-status.is-ok { color: var(--ok); }
.img-placeholder { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.25rem; width: 100%; padding: 1rem; text-align: center; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; line-height: 1.5; }
.img-placeholder b { display: block; font-size: 0.92rem; letter-spacing: 0; text-transform: none; word-break: break-all; }
:target { scroll-margin-top: 120px; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; } }

/* ==========================================================================
   Onyx HVAC & Building Coatings — onyxhvac.xyz
   Onyx black, bone and mint; a quiet wide serif.
   01 Tokens · 02 Base · 03 Header · 04 Edge tab (mobile) · 05 Buttons
   06 Hero · 07 Page heads · 08 Sections · 09 Generator check (signature)
   10 FAQ · 11 Form & contact · 12 Footer · 13 Images
   ========================================================================== */

/* 01 Tokens */
:root {
  --onyx: #17181c; --onyx-2: #232429; --bone: #f4f2ee; --bone-2: #e8e5df; --white: #ffffff;
  --mint: #3ddc97; --mint-dark: #0f7a52; --mint-soft: #e2f7ee;
  --ink: #101114; --text: #43464c; --muted: #61656c; --line: #ddd9d2;
  --focus: #0f7a52; --err: #b3261e; --ok: #0f7a52;
  --serif: "Tenor Sans", "Optima", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --f-sm: 0.92rem; --f0: clamp(1rem, 0.97rem + 0.15vw, 1.07rem); --f1: clamp(1.18rem, 1.06rem + 0.5vw, 1.45rem);
  --f2: clamp(1.75rem, 1.35rem + 1.7vw, 2.5rem); --f3: clamp(2.2rem, 1.55rem + 3vw, 3.8rem);
  --r: 2px; --wrap: 1160px; --pad-y: clamp(3.2rem, 2.4rem + 4vw, 6rem);
}

/* 02 Base */
body { background: var(--bone); color: var(--text); font-family: var(--sans); font-size: var(--f0); line-height: 1.7; }
h1, h2, h3 { margin: 0 0 0.5em; font-family: var(--serif); color: var(--ink); font-weight: 400; line-height: 1.18; letter-spacing: 0.01em; text-wrap: balance; }
h1 { font-size: var(--f3); }
h2 { font-size: var(--f2); }
h3 { font-size: var(--f1); }
p { margin: 0 0 1em; max-width: 64ch; }
p:last-child { margin-bottom: 0; }
a { color: var(--mint-dark); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
strong, b { color: var(--ink); font-weight: 650; }
ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
.wrap { width: min(100% - 2rem, var(--wrap)); margin-inline: auto; }
.over { display: block; margin-bottom: 0.9rem; font-size: 0.76rem; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase; color: var(--mint-dark); }
.mt { margin-top: 2rem; }

/* 03 Header */
.hd { position: sticky; top: 0; z-index: 30; background: var(--onyx); color: #c3c6cb; }
.hd .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 70px; }
.ox-logo { display: inline-flex; align-items: center; gap: 0.6rem; color: #fff; text-decoration: none; }
.ox-logo svg { width: 30px; height: 30px; flex: none; }
.ox-logo b { color: #fff; display: block; font-family: var(--serif); font-size: 1.32rem; font-weight: 400; letter-spacing: 0.1em; text-transform: uppercase; line-height: 1; }
.ox-logo small { display: block; margin-top: 0.22rem; font-size: 0.64rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--mint); }
.nav-toggle { display: inline-flex; align-items: center; gap: 0.4rem; flex: none; min-height: 42px; padding: 0 0.9rem; border: 1px solid #40434a; background: transparent; color: #fff; font: inherit; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.86rem; cursor: pointer; }
.nav-toggle svg { width: 18px; height: 18px; }
.hd :focus-visible { outline-color: var(--mint); }
.onav { display: none; }
@media (max-width: 1019px) {
  .onav { position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; padding: 0.4rem 1rem 1.2rem; background: var(--onyx-2); }
  .onav.is-open { display: flex; }
  .onav a { padding: 0.85rem 0.3rem; border-bottom: 1px solid #33353b; color: #fff; font-family: var(--serif); font-size: 1.15rem; letter-spacing: 0.06em; text-decoration: none; }
  .onav a[aria-current="page"] { color: var(--mint); }
}
@media (max-width: 420px) { .ox-logo small { display: none; } }
@media (min-width: 1020px) {
  .hd .wrap { min-height: 82px; gap: 1.6rem; }
  .nav-toggle { display: none; }
  .onav { display: flex; gap: 1.6rem; margin-left: auto; }
  .onav a { padding: 0.3rem 0; color: #c3c6cb; font-size: 0.92rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; text-decoration: none; border-bottom: 1px solid transparent; }
  .onav a:hover { color: #fff; }
  .onav a[aria-current="page"] { color: #fff; border-bottom-color: var(--mint); }
  .hd__tel { color: #fff; font-family: var(--serif); font-size: 1.1rem; letter-spacing: 0.04em; text-decoration: none; white-space: nowrap; }
}
.hd__tel { display: none; }
@media (min-width: 1020px) { .hd__tel { display: inline-block; } }

/* 04 Edge tab (mobile) — the number, rotated, on the right edge */
.edge { position: fixed; right: 0; top: 50%; z-index: 40; transform: translateY(-50%) ; display: flex; align-items: center; gap: 0.5rem; padding: 0.9rem 0.6rem; background: var(--mint); color: var(--ink); font-weight: 700; font-size: 0.95rem; text-decoration: none; writing-mode: vertical-rl; box-shadow: -4px 0 14px -6px rgba(16,17,20,0.5); }
.edge svg { width: 17px; height: 17px; }
.edge:hover { background: var(--ink); color: #fff; }
.edge:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }
@media (min-width: 1020px) { .edge { display: none; } }

/* 05 Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.9rem 1.5rem; border: 0; border-radius: var(--r); background: var(--ink); color: #fff; font: inherit; font-weight: 650; letter-spacing: 0.04em; line-height: 1.3; text-decoration: none; white-space: nowrap; cursor: pointer; transition: background-color 0.2s, color 0.2s; }
.btn:hover { background: var(--mint-dark); color: #fff; }
.btn svg { width: 1.1em; height: 1.1em; flex: none; }
.btn--mint { background: var(--mint); color: var(--ink); }
.btn--mint:hover { background: #fff; color: var(--ink); }
.btn--line { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink); }
.btn--line:hover { background: var(--ink); color: #fff; }
.btn--bone { background: var(--bone); color: var(--ink); }
.btn--bone:hover { background: var(--mint); color: var(--ink); }
.btns { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.7rem; }

/* 06 Hero */
.hero { padding-block: clamp(3rem, 2.4rem + 3vw, 5rem); background: var(--onyx); color: #c3c6cb; }
.hero h1 { color: #fff; max-width: 17ch; }
.hero .over { color: var(--mint); }
.hero p.lede { font-size: var(--f1); line-height: 1.55; max-width: 42ch; }
.hero .wrap { display: grid; gap: 2.6rem; align-items: center; }
@media (min-width: 940px) { .hero .wrap { grid-template-columns: 1.05fr 0.95fr; gap: 3.6rem; } }
.hero img, .hero .img-placeholder { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.hero :focus-visible { outline-color: var(--mint); }

/* 07 Page heads */
.phead { padding-block: clamp(2.6rem, 2rem + 3vw, 4.2rem); background: var(--bone-2); border-bottom: 1px solid var(--line); }
.phead h1 { font-size: clamp(2rem, 1.5rem + 2.2vw, 3.2rem); max-width: 20ch; }
.phead p { font-size: 1.08rem; max-width: 58ch; }
.crumbs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 1rem; padding: 0; list-style: none; font-size: 0.84rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.crumbs li + li::before { content: "—"; margin-right: 0.5rem; color: var(--mint-dark); }

/* 08 Sections */
.sec { padding-block: var(--pad-y); }
.sec--white { background: var(--white); }
.sec--bone { background: var(--bone-2); }
.sec--onyx { background: var(--onyx); color: #c3c6cb; }
.sec--onyx h2, .sec--onyx h3, .sec--onyx b { color: #fff; }
.sec--onyx .over { color: var(--mint); }
.sec--onyx a:not(.btn) { color: #fff; }
.sec--onyx :focus-visible { outline-color: var(--mint); }
.head { max-width: 640px; margin-bottom: 2.6rem; }
.duo { display: grid; gap: 2rem; }
@media (min-width: 840px) { .duo { grid-template-columns: 1fr 1fr; gap: 3rem; } }
.duo article { display: flex; flex-direction: column; }
.duo figure { margin-bottom: 1.4rem; }
.duo img, .duo .img-placeholder { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; }
.duo h3 { font-size: 1.45rem; }
.duo ul { margin: 0.6rem 0 1.4rem; padding: 0; list-style: none; font-size: var(--f-sm); }
.duo li { padding: 0.45rem 0; border-bottom: 1px solid var(--line); }
.duo .btns { margin-top: auto; }
.split { display: grid; gap: 2.6rem; align-items: center; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; gap: 3.6rem; } .split--flip > :first-child { order: 2; } }
.split > * { min-width: 0; }
.split img, .split .img-placeholder { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.rows { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.rows li { display: grid; gap: 0.2rem; padding: 1.05rem 0; border-bottom: 1px solid var(--line); }
.rows b { font-family: var(--serif); font-size: 1.12rem; font-weight: 400; }
.rows span { font-size: var(--f-sm); }
.map { display: block; width: 100%; height: clamp(300px, 34vw, 420px); background: var(--mint-soft); }
.where { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 880px) { .where { grid-template-columns: 0.85fr 1.15fr; gap: 3rem; } }

/* 09 Generator check (signature) */
.gen { display: grid; gap: 2rem; align-items: start; }
@media (min-width: 940px) { .gen { grid-template-columns: 0.95fr 1.05fr; gap: 3rem; } }
.gen__form { padding: clamp(1.4rem, 1rem + 2vw, 2.2rem); background: var(--white); border: 1px solid var(--line); }
.gen__form .q { display: grid; gap: 0.4rem; margin-bottom: 1.3rem; }
.gen__form label { font-weight: 650; color: var(--ink); }
.gen__form small { font-size: var(--f-sm); font-weight: 400; color: var(--muted); }
.readout { padding: clamp(1.4rem, 1rem + 2vw, 2.2rem); background: var(--onyx); color: #c3c6cb; }
.readout h2 { color: #fff; font-size: 1.3rem; }
.readout dl { display: grid; grid-template-columns: 1fr auto; gap: 0.5rem 1rem; margin: 1rem 0 0; padding-top: 1rem; border-top: 1px solid #34363c; }
.readout dt { margin: 0; }
.readout dd { margin: 0; font-family: var(--serif); font-size: 1.25rem; color: var(--mint); text-align: right; }
.readout p { margin-top: 1.2rem; font-size: var(--f-sm); }
.readout :focus-visible { outline-color: var(--mint); }
.pts { display: grid; gap: 0.9rem; margin: 0; padding: 0; list-style: none; }
@media (min-width: 760px) { .pts { grid-template-columns: repeat(2, 1fr); } }
.pts li { padding: 1.3rem; background: var(--white); border-left: 3px solid var(--mint); font-size: var(--f-sm); }
.pts b { display: block; font-family: var(--serif); font-size: 1.08rem; color: var(--ink); }

/* 10 FAQ */
.faq { display: grid; gap: 0; max-width: 880px; border-top: 1px solid var(--line); }
.oq2 { border-bottom: 1px solid var(--line); }
.oq2 summary { display: flex; justify-content: space-between; gap: 1rem; padding: 1.1rem 0; font-family: var(--serif); font-size: 1.1rem; color: var(--ink); list-style: none; }
.oq2 summary::after { content: "+"; flex: none; font-family: var(--sans); color: var(--mint-dark); }
.oq2[open] summary::after { content: "–"; }
.oq2 > div { padding: 0 0 1.1rem; }

/* 11 Form & contact */
.form { display: grid; gap: 1.1rem 1.4rem; margin-top: 1.2rem; }
@media (min-width: 640px) { .form--2col { grid-template-columns: 1fr 1fr; } }
.field--full, .form__end { grid-column: 1 / -1; }
.field label, .picks legend { font-weight: 650; color: var(--ink); font-size: 0.95rem; }
.req { color: var(--err); }
.opt { font-weight: 400; color: var(--muted); }
input[type="text"], input[type="tel"], input[type="email"], select, textarea { width: 100%; padding: 0.8rem 0.95rem; font: inherit; color: var(--ink); background: var(--white); border: 1px solid #c8c4bc; border-radius: var(--r); }
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2317181c' stroke-width='2.6'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 0.9rem center; background-size: 15px; padding-right: 2.4rem; }
textarea { min-height: 140px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--ink); }
.picks { margin: 0; padding: 0; border: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.picks legend { margin-bottom: 0.5rem; padding: 0; }
.pick { position: relative; }
.pick input { position: absolute; opacity: 0; }
.pick span { display: inline-block; padding: 0.5rem 0.9rem; border: 1px solid #c8c4bc; background: var(--white); font-size: var(--f-sm); cursor: pointer; }
.pick input:checked + span { background: var(--ink); border-color: var(--ink); color: #fff; }
.pick input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.form-note { margin: 0.5rem 0 0; font-size: 0.85rem; color: var(--muted); }
.contact { display: grid; gap: 2.6rem; align-items: start; }
@media (min-width: 920px) { .contact { grid-template-columns: 1.15fr 0.85fr; gap: 3.4rem; } }
.contact > * { min-width: 0; }
.card { padding: 1.8rem; background: var(--white); border: 1px solid var(--line); }
.card h2 { font-size: 1.15rem; }
.card .big { display: block; margin: 0.2rem 0 1rem; font-family: var(--serif); font-size: 1.6rem; color: var(--ink); text-decoration: none; }
.card dl { margin: 0; }
.card dt { margin-top: 1rem; font-size: 0.76rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--mint-dark); }
.card dd { margin: 0.15rem 0 0; }

/* 12 Footer */
.ft { background: var(--onyx); color: #b3b7bd; font-size: var(--f-sm); }
.ft a { color: #fff; }
.ft :focus-visible { outline-color: var(--mint); }
.ft__row { display: grid; gap: 1.6rem; padding-block: 3rem 1.8rem; }
@media (min-width: 820px) { .ft__row { grid-template-columns: 1.5fr 1fr 1fr; } }
.ft__name { margin: 0 0 0.5rem; font-family: var(--serif); font-size: 1.4rem; letter-spacing: 0.08em; text-transform: uppercase; color: #fff; }
.ft h2 { margin: 0 0 0.6rem; font-family: var(--sans); font-size: 0.76rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--mint); }
.ft ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.35rem; }
.ft__base { padding-block: 1rem; border-top: 1px solid rgba(255,255,255,0.12); font-size: 0.82rem; }

/* 13 Images */
.img-placeholder { background: var(--mint-soft); border: 1px dashed #9ecfba; color: var(--muted); }
.img-placeholder b { color: var(--ink); }
.hero .img-placeholder { background: #232429; border-color: #3c3f46; color: #c3c6cb; }
.hero .img-placeholder b { color: #fff; }
@media (max-width: 560px) { .mlabel { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; } .nav-toggle { padding: 0 0.7rem; } .hd .btn { padding: 0.7rem 0.85rem; font-size: 0.86rem; } .hd .wrap { gap: 0.5rem; } }