/* 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; } }

/* ==========================================================================
   Golden Oak HVAC & Surface Group — goldenoakhvac.xyz
   Sand, mesquite brown and chili red; a warm text serif.
   01 Tokens · 02 Base · 03 Header · 04 Sun button (mobile) · 05 Buttons
   06 Hero with sun arc · 07 Page heads · 08 Sections
   09 Duct temperature check (signature) · 10 FAQ · 11 Form & contact · 12 Footer · 13 Images
   ========================================================================== */

/* 01 Tokens */
:root {
  --sand: #f3ead8; --sand-2: #e9dcc2; --paper: #fffdf8; --white: #ffffff;
  --mesquite: #5a4632; --mesquite-dark: #3e3022; --chili: #c1462c; --chili-dark: #9c3520; --chili-soft: #fae3dc;
  --ink: #2a211a; --text: #4b453d; --muted: #6a6257; --line: #ddd0b6;
  --focus: #9c3520; --err: #9c3520; --ok: #3f6b3a;
  --serif: "Andada Pro", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --f-sm: 0.93rem; --f0: clamp(1rem, 0.97rem + 0.15vw, 1.08rem); --f1: clamp(1.2rem, 1.08rem + 0.5vw, 1.5rem);
  --f2: clamp(1.8rem, 1.4rem + 1.7vw, 2.7rem); --f3: clamp(2.2rem, 1.55rem + 3vw, 3.9rem);
  --r: 6px; --wrap: 1140px; --pad-y: clamp(3.2rem, 2.4rem + 4vw, 5.8rem);
}

/* 02 Base */
body { background: var(--paper); color: var(--text); font-family: var(--sans); font-size: var(--f0); line-height: 1.68; }
h1, h2, h3 { margin: 0 0 0.5em; font-family: var(--serif); color: var(--ink); font-weight: 700; line-height: 1.16; text-wrap: balance; }
h1 { font-size: var(--f3); }
h2 { font-size: var(--f2); }
h3 { font-size: var(--f1); font-weight: 600; }
p { margin: 0 0 1em; max-width: 64ch; }
p:last-child { margin-bottom: 0; }
a { color: var(--chili-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; }
.eyebrow { display: block; margin-bottom: 0.8rem; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--chili-dark); }
.mt { margin-top: 2rem; }

/* 03 Header */
.hd { position: sticky; top: 0; z-index: 30; background: var(--sand); border-bottom: 3px solid var(--mesquite); }
.hd .wrap { display: flex; align-items: center; gap: 0.8rem; min-height: 68px; }
.go-logo { display: inline-flex; align-items: center; gap: 0.6rem; margin-right: auto; color: var(--ink); text-decoration: none; }
.go-logo svg { width: 38px; height: 38px; flex: none; }
.go-logo b { display: block; font-family: var(--serif); font-size: 1.3rem; font-weight: 700; line-height: 1; }
.go-logo small { display: block; margin-top: 0.2rem; font-size: 0.7rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--mesquite); }
.hd__tel { display: inline-grid; place-items: center; flex: none; width: 46px; height: 46px; border-radius: 50%; background: var(--mesquite); color: var(--sand); }
.hd__tel svg { width: 20px; height: 20px; }
.hd__tel span { display: none; }
.nav-toggle { display: inline-flex; align-items: center; gap: 0.4rem; flex: none; min-height: 46px; padding: 0 0.9rem; border: 2px solid var(--mesquite); border-radius: var(--r); background: transparent; color: var(--mesquite-dark); font: inherit; font-weight: 700; cursor: pointer; }
.nav-toggle svg { width: 20px; height: 20px; }
.gnav { display: none; }
.hd .hd__cta { display: none; }
@media (max-width: 1019px) {
  .gnav { position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; padding: 0.4rem 1rem 1.2rem; background: var(--sand); border-bottom: 3px solid var(--chili); }
  .gnav.is-open { display: flex; }
  .gnav a { padding: 0.8rem 0.3rem; border-bottom: 1px solid var(--line); color: var(--ink); font-family: var(--serif); font-size: 1.15rem; font-weight: 600; text-decoration: none; }
  .gnav a[aria-current="page"] { color: var(--chili-dark); }
}
@media (max-width: 400px) { .go-logo small { display: none; } .go-logo b { font-size: 1.15rem; } }
@media (min-width: 1020px) {
  .hd .wrap { min-height: 80px; gap: 1.4rem; }
  .nav-toggle { display: none; }
  .gnav { display: flex; gap: 1.5rem; }
  .gnav a { padding: 0.3rem 0; color: var(--text); font-weight: 600; text-decoration: none; border-bottom: 3px solid transparent; }
  .gnav a:hover { color: var(--ink); }
  .gnav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--chili); }
  .hd__tel { width: auto; height: auto; padding: 0.55rem 1rem; border-radius: 99px; display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 700; text-decoration: none; }
  .hd__tel span { display: inline; }
  .hd .hd__cta { display: inline-flex; }
}

/* 04 Sun button (mobile) */
.sun { position: fixed; right: 14px; bottom: 14px; z-index: 40; display: grid; place-items: center; width: 74px; height: 74px; border-radius: 50%; background: var(--chili); color: #fff; font-weight: 700; font-size: 0.92rem; text-decoration: none; box-shadow: 0 0 0 6px rgba(193,70,44,0.18), 0 10px 20px -10px rgba(42,33,26,0.6); }
.sun:hover { background: var(--mesquite-dark); color: #fff; }
.sun:focus-visible { outline: 3px solid var(--ink); outline-offset: 4px; }
@media (min-width: 1020px) { .sun { display: none; } }

/* 05 Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.85rem 1.45rem; border: 0; border-radius: var(--r); background: var(--chili-dark); color: #fff; font: inherit; font-weight: 650; line-height: 1.3; text-decoration: none; white-space: nowrap; cursor: pointer; transition: background-color 0.2s, color 0.2s; }
.btn:hover { background: var(--ink); color: #fff; }
.btn svg { width: 1.1em; height: 1.1em; flex: none; }
.btn--brown { background: var(--mesquite); }
.btn--brown:hover { background: var(--mesquite-dark); }
.btn--line { background: transparent; color: var(--mesquite-dark); box-shadow: inset 0 0 0 2px var(--mesquite); }
.btn--line:hover { background: var(--mesquite); color: #fff; }
.btn--sand { background: var(--sand); color: var(--ink); }
.btn--sand:hover { background: #fff; color: var(--ink); }
.btns { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.6rem; }

/* 06 Hero with sun arc */
.hero { position: relative; padding-block: clamp(2.8rem, 2.2rem + 3vw, 4.8rem) var(--pad-y); background: var(--sand); overflow: hidden; }
.hero__arc { position: absolute; top: -18%; right: -10%; width: min(70vw, 560px); height: auto; color: rgba(193,70,44,0.16); pointer-events: none; }
.hero .wrap { position: relative; display: grid; gap: 2.4rem; align-items: center; }
@media (min-width: 940px) { .hero .wrap { grid-template-columns: 1.05fr 0.95fr; gap: 3.4rem; } }
.hero p.lede { font-size: var(--f1); line-height: 1.5; color: var(--ink); max-width: 40ch; }
.hero img, .hero .img-placeholder { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--r); }

/* 07 Page heads */
.phead { padding-block: clamp(2.6rem, 2rem + 3vw, 4.2rem); background: var(--mesquite); color: #e7ddcd; }
.phead h1 { color: #fff; font-size: clamp(2rem, 1.5rem + 2.4vw, 3.3rem); max-width: 20ch; }
.phead p { font-size: 1.1rem; max-width: 58ch; }
.phead a { color: #fff; }
.phead :focus-visible { outline-color: var(--sand); }
.crumbs { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0 0 1rem; padding: 0; list-style: none; font-size: 0.86rem; }
.crumbs li + li::before { content: "•"; margin-right: 0.5rem; color: var(--chili-soft); }

/* 08 Sections */
.sec { padding-block: var(--pad-y); }
.sec--sand { background: var(--sand); }
.sec--white { background: var(--white); }
.sec--brown { background: var(--mesquite); color: #e7ddcd; }
.sec--brown h2, .sec--brown h3, .sec--brown b { color: #fff; }
.sec--brown .eyebrow { color: #f0b9a8; }
.sec--brown a:not(.btn) { color: #fff; }
.sec--brown :focus-visible { outline-color: var(--sand); }
.head { max-width: 640px; margin-bottom: 2.4rem; }
.duo { display: grid; gap: 1.6rem; }
@media (min-width: 820px) { .duo { grid-template-columns: 1fr 1fr; gap: 2rem; } }
.duo article { display: flex; flex-direction: column; padding: 1.8rem; background: var(--white); border: 1px solid var(--line); border-radius: var(--r); }
.sec--sand .duo article { background: var(--paper); }
.duo h3 { font-size: 1.4rem; }
.duo ul { margin: 0.6rem 0 1.4rem; padding: 0; list-style: none; }
.duo li { padding: 0.5rem 0; border-bottom: 1px solid var(--line); font-size: var(--f-sm); }
.duo .btns { margin-top: auto; }
.split { display: grid; gap: 2.4rem; align-items: center; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; gap: 3.4rem; } .split--flip > :first-child { order: 2; } }
.split > * { min-width: 0; }
.split img, .split .img-placeholder { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: var(--r); }
.svc { margin: 0; padding: 0; list-style: none; display: grid; gap: 1rem; }
@media (min-width: 760px) { .svc { grid-template-columns: 1fr 1fr; } }
.svc li { padding: 1.2rem 1.4rem; background: var(--sand); border-radius: var(--r); }
.sec--sand .svc li { background: var(--paper); }
.svc b { display: block; font-family: var(--serif); font-size: 1.12rem; margin-bottom: 0.15rem; }
.thermo { display: flex; align-items: center; gap: 1.2rem; padding: 1.4rem 1.6rem; background: var(--chili-soft); border-radius: var(--r); }
.thermo svg { width: 42px; height: 42px; flex: none; color: var(--chili-dark); }
.thermo p { margin: 0; }
.thermo b { display: block; font-family: var(--serif); font-size: 1.2rem; }
.map { display: block; width: 100%; height: clamp(300px, 34vw, 420px); border-radius: var(--r); background: var(--sand-2); }
.where { display: grid; gap: 2rem; align-items: center; }
@media (min-width: 880px) { .where { grid-template-columns: 0.85fr 1.15fr; gap: 3rem; } }

/* 09 Duct temperature check (signature) */
.check { display: grid; gap: 2rem; align-items: start; }
@media (min-width: 940px) { .check { grid-template-columns: 1fr 1fr; gap: 3rem; } }
.check__form { padding: clamp(1.4rem, 1rem + 2vw, 2.2rem); background: var(--sand); border-radius: var(--r); }
.temps { display: grid; gap: 1rem; }
.temp { display: grid; gap: 0.3rem; }
.temp label { font-weight: 650; color: var(--ink); }
.temp small { display: block; font-weight: 400; font-size: var(--f-sm); color: var(--muted); }
.temp input { max-width: 8rem; font-size: 1.15rem; }
.check__out { display: grid; gap: 1rem; }
.result { padding: 1.4rem 1.6rem; background: var(--white); border: 1px solid var(--line); border-left: 6px solid var(--line); border-radius: var(--r); }
.result h3 { font-size: 1.2rem; margin-bottom: 0.2rem; }
.result .val { display: block; font-family: var(--serif); font-size: 1.9rem; font-weight: 700; color: var(--ink); line-height: 1.2; }
.result p { margin: 0.4rem 0 0; font-size: var(--f-sm); }
.result[data-flag="ok"] { border-left-color: var(--ok); }
.result[data-flag="warn"] { border-left-color: var(--chili); }
.result[data-flag="none"] { border-left-color: var(--line); }
.howto { margin: 0; padding-left: 1.3em; }
.howto li { margin-bottom: 0.5rem; }

/* 10 FAQ */
.faq { display: grid; gap: 0.6rem; max-width: 880px; }
.gq { background: var(--sand); border-radius: var(--r); }
.sec--sand .gq { background: var(--paper); }
.gq summary { display: flex; justify-content: space-between; gap: 1rem; padding: 1.05rem 1.2rem; font-family: var(--serif); font-weight: 600; color: var(--ink); list-style: none; }
.gq summary::after { content: "+"; flex: none; color: var(--chili-dark); font-family: var(--sans); font-size: 1.3rem; line-height: 1.1; }
.gq[open] summary::after { content: "–"; }
.gq > div { padding: 0 1.2rem 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"], input[type="number"], select, textarea { width: 100%; padding: 0.8rem 0.95rem; font: inherit; color: var(--ink); background: var(--white); border: 1px solid #c8bda4; 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='%235a4632' 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(--mesquite); }
.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 #c8bda4; border-radius: 99px; background: var(--white); font-size: var(--f-sm); cursor: pointer; }
.pick input:checked + span { background: var(--mesquite); border-color: var(--mesquite); 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: 2.4rem; align-items: start; }
@media (min-width: 920px) { .contact { grid-template-columns: 1.15fr 0.85fr; gap: 3.2rem; } }
.contact > * { min-width: 0; }
.card { padding: 1.8rem; background: var(--sand); border-radius: var(--r); }
.card h2 { font-size: 1.2rem; }
.card .big { display: block; margin: 0.2rem 0 1rem; font-family: var(--serif); font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.1rem); font-weight: 700; color: var(--ink); text-decoration: none; }
.card dt { margin-top: 1rem; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--mesquite); }
.card dd { margin: 0.15rem 0 0; }
.card dl { margin: 0; }

/* 12 Footer */
.ft { background: var(--mesquite-dark); color: #d6cbb9; font-size: var(--f-sm); }
.ft a { color: #fff; }
.ft :focus-visible { outline-color: var(--sand); }
.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; font-weight: 700; color: #fff; }
.ft h2 { margin: 0 0 0.6rem; font-family: var(--sans); font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: #f0b9a8; }
.ft ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.35rem; }
.ft__base { padding-block: 1rem 6.4rem; border-top: 1px solid rgba(255,255,255,0.14); font-size: 0.82rem; }
@media (min-width: 1020px) { .ft__base { padding-bottom: 1rem; } }

/* 13 Images */
.img-placeholder { background: var(--sand-2); border: 1px dashed #b9a883; border-radius: var(--r); color: var(--muted); }
.img-placeholder b { color: var(--ink); }