/* 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; } }

/* ==========================================================================
   ZenithHue HVAC Studio — zenithhuehvac.xyz
   Bold navy and sun-yellow. Two-tier header with a quick-links strip.
   01 Tokens · 02 Base · 03 Header & strip · 04 Hero · 05 Page heads
   06 Buttons · 07 Tabs & blocks · 08 Duct check (signature) · 09 FAQ
   10 Form & contact · 11 Footer · 12 Images
   ========================================================================== */

/* 01 Tokens */
:root {
  --navy: #14213d; --navy-2: #1f3057; --text: #3b4458; --muted: #5d6679; --line: #e6e1cf;
  --paper: #fffdf5; --white: #ffffff; --cream: #fbf6e3;
  --sun: #f0b400; --sun-hover: #ffc62e; --sun-soft: #fff4cc; --sun-ink: #8a6400;
  --focus: #14213d; --err: #b42318; --ok: #1f6f3a;
  --font: "Bai Jamjuree", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-sm: 0.94rem; --f0: clamp(1.02rem, 0.99rem + 0.15vw, 1.1rem); --f1: clamp(1.25rem, 1.12rem + 0.5vw, 1.55rem);
  --f2: clamp(1.8rem, 1.45rem + 1.6vw, 2.8rem); --f3: clamp(2.4rem, 1.8rem + 3vw, 4.3rem);
  --wrap: 1200px; --pad-y: clamp(3.4rem, 2.4rem + 4vw, 6rem);
}

/* 02 Base */
body { background: var(--paper); color: var(--text); font-family: var(--font); font-size: var(--f0); line-height: 1.65; }
h1, h2, h3 { margin: 0 0 0.45em; font-weight: 700; color: var(--navy); line-height: 1.08; letter-spacing: -0.015em; text-wrap: balance; }
h1 { font-size: var(--f3); }
h2 { font-size: var(--f2); }
h3 { font-size: var(--f1); line-height: 1.2; }
p { margin: 0 0 1em; max-width: 62ch; }
p:last-child { margin-bottom: 0; }
a { color: var(--navy); text-decoration-color: var(--sun); text-decoration-thickness: 3px; text-underline-offset: 3px; }
a:hover { color: var(--sun-ink); }
strong, b { color: var(--navy); }
ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
.wrap { width: min(100% - 2rem, var(--wrap)); margin-inline: auto; }
.kick { display: inline-block; margin-bottom: 0.9rem; padding: 0.2rem 0.6rem; background: var(--navy); color: var(--sun); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }

/* 03 Header & strip */
.bar { background: var(--navy); color: #fff; }
.bar .wrap { display: flex; align-items: stretch; justify-content: space-between; gap: 1rem; min-height: 72px; }
.zmark { display: inline-flex; align-items: center; gap: 0.6rem; color: #fff; text-decoration: none; }
.zmark svg { width: 40px; height: 40px; flex: none; }
.zmark b { display: flex; flex-direction: column; color: #fff; font-size: 1.4rem; font-weight: 700; line-height: 1.05; letter-spacing: -0.01em; }
.zmark span { font-weight: 400; color: #c8cfdd; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.mainnav { display: none; }
.mainnav a { position: relative; display: flex; align-items: center; padding: 0 1rem; color: #fff; text-decoration: none; font-weight: 600; }
.mainnav a:hover { color: var(--sun); }
.mainnav a[aria-current="page"] { background: var(--sun); color: var(--navy); }
.bar__tel { display: none; align-items: center; gap: 0.45rem; margin-left: 1rem; color: #fff; font-weight: 700; text-decoration: none; white-space: nowrap; }
.bar__tel svg { width: 16px; height: 16px; color: var(--sun); }
.bar__icons { display: flex; align-items: center; gap: 0.4rem; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px; padding: 0; border: 1.5px solid rgba(255,255,255,0.35); border-radius: 4px; background: transparent; color: #fff; cursor: pointer; }
.icon-btn svg { width: 20px; height: 20px; }
.bar :focus-visible { outline-color: var(--sun); }
.strip { background: var(--sun); }
.strip .wrap { display: flex; gap: 0.2rem; overflow-x: auto; scrollbar-width: none; }
.strip .wrap::-webkit-scrollbar { display: none; }
.strip a { flex: none; padding: 0.7rem 0.9rem; color: var(--navy); font-weight: 600; font-size: 0.95rem; text-decoration: none; white-space: nowrap; }
.strip a:hover { background: rgba(20,33,61,0.08); }
.strip a.strip__cta { background: var(--navy); color: var(--sun); font-weight: 700; }
.strip a.strip__cta:hover { background: var(--navy-2); }
.strip__label { flex: none; align-self: center; padding: 0 0.8rem 0 0; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--navy); }
@media (max-width: 1039px) {
  .bar { position: relative; }
  .mainnav { position: absolute; top: 100%; left: 0; right: 0; z-index: 80; flex-direction: column; padding: 0.5rem 1rem 1rem; background: var(--navy); border-top: 1px solid var(--navy-2); }
  .mainnav.is-open { display: flex; }
  .mainnav a { padding: 0.9rem 0.5rem; border-bottom: 1px solid var(--navy-2); }
  .strip__label { display: none; }
}
@media (min-width: 1040px) {
  .mainnav { display: flex; margin-left: auto; }
  .bar__tel { display: inline-flex; }
  .bar__icons { display: none; }
}

/* 04 Hero */
.hero { position: relative; background: linear-gradient(90deg, var(--sun) 0 62%, var(--paper) 62%); }
@media (max-width: 899px) { .hero { background: var(--sun); } }
.hero .wrap { display: grid; gap: 2rem; align-items: center; padding-block: clamp(2.6rem, 2rem + 3vw, 4.8rem); }
@media (min-width: 900px) { .hero .wrap { grid-template-columns: 1.15fr 0.85fr; } }
.hero .wrap > * { min-width: 0; }
.hero h1 { max-width: 13ch; }
.hero p.big { font-size: var(--f1); line-height: 1.45; color: var(--navy); max-width: 32ch; }
.hero .kick { background: var(--navy); }
.hero figure { position: relative; }
.hero figure::after { content: ""; position: absolute; inset: 1.2rem -1.2rem -1.2rem 1.2rem; border: 6px solid var(--navy); z-index: 0; pointer-events: none; }
.hero figure img, .hero figure .img-placeholder { position: relative; z-index: 1; border-radius: 0; }
@media (max-width: 899px) { .hero figure::after { inset: 0.8rem -0.6rem -0.8rem 0.8rem; } }
.hero :focus-visible { outline-color: var(--navy); }

/* 05 Page heads */
.phead { background: var(--navy); color: #d2d8e4; }
.phead .wrap { padding-block: clamp(2.4rem, 2rem + 2.5vw, 4rem); border-left: 10px solid var(--sun); padding-left: clamp(1rem, 0.6rem + 2vw, 2.2rem); }
.phead h1 { color: #fff; font-size: clamp(2.1rem, 1.6rem + 2.4vw, 3.5rem); max-width: 18ch; }
.phead p { font-size: var(--f1); line-height: 1.45; max-width: 52ch; }
.crumbs { display: flex; gap: 0.5rem; margin: 0 0 1rem; padding: 0; list-style: none; font-size: var(--f-sm); color: #aeb7c8; }
.crumbs li + li::before { content: "/"; margin-right: 0.5rem; color: var(--sun); }
.crumbs a { color: #fff; }
.phead :focus-visible { outline-color: var(--sun); }

/* 06 Buttons */
.btns { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.6rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.85rem 1.4rem; border: 3px solid var(--navy); border-radius: 0; font: inherit; font-weight: 700; text-decoration: none; white-space: nowrap; cursor: pointer; box-shadow: 4px 4px 0 var(--navy); transition: transform 0.15s, box-shadow 0.15s; }
.btn:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--navy); }
.btn svg { width: 1em; height: 1em; }
.btn--navy { background: var(--navy); color: var(--sun); }
.btn--navy:hover { color: #fff; }
.btn--white { background: var(--white); color: var(--navy); }
.btn--sun { background: var(--sun); color: var(--navy); }
.btn--sun:hover { background: var(--sun-hover); color: var(--navy); }

/* 07 Tabs & blocks */
.sec { padding-block: var(--pad-y); }
.sec--cream { background: var(--cream); }
.sec--navy { background: var(--navy); color: #d2d8e4; }
.sec--navy h2, .sec--navy h3 { color: #fff; }
.sec--navy .kick { background: var(--sun); color: var(--navy); }
.sec--navy a { color: #fff; }
.sec--navy :focus-visible { outline-color: var(--sun); }
.title-row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 1rem 2rem; margin-bottom: clamp(1.6rem, 1.2rem + 2vw, 2.6rem); }
.title-row h2 { margin: 0; max-width: 20ch; }
.tabs [role="tablist"] { display: flex; gap: 0; border-bottom: 3px solid var(--navy); }
.tabs [role="tab"] { padding: 0.9rem 1.6rem; border: 3px solid var(--navy); border-bottom: 0; margin-right: -3px; background: var(--white); color: var(--navy); font: inherit; font-weight: 700; font-size: 1.08rem; cursor: pointer; }
.tabs [role="tab"][aria-selected="true"] { background: var(--sun); }
.tabs [role="tablist"][hidden] { display: none; }
.tabpanel { display: grid; gap: 2rem; padding: clamp(1.4rem, 1rem + 2vw, 2.6rem) 0; }
@media (min-width: 900px) { .tabpanel { grid-template-columns: 1fr 1fr; align-items: center; } }
.tabpanel > * { min-width: 0; }
.tabs.is-live .tabpanel[hidden] { display: none; }
.tabs:not(.is-live) .tabpanel + .tabpanel { border-top: 3px solid var(--navy); }
.sq-list { margin: 1rem 0 1.4rem; padding: 0; list-style: none; display: grid; gap: 0.55rem; }
.sq-list li { position: relative; padding-left: 1.9rem; }
.sq-list li::before { content: ""; position: absolute; left: 0; top: 0.3rem; width: 1.1rem; height: 1.1rem; background: var(--sun); border: 2px solid var(--navy); }
.tune { display: grid; gap: 0; grid-template-columns: repeat(auto-fill, minmax(min(100%, 230px), 1fr)); border-top: 3px solid var(--navy); border-left: 3px solid var(--navy); }
.tune > div { padding: 1.3rem 1.2rem; border-right: 3px solid var(--navy); border-bottom: 3px solid var(--navy); background: var(--white); }
.tune b { display: block; margin-bottom: 0.2rem; font-size: 1.05rem; }
.tune span { font-size: var(--f-sm); }
.tune > div:nth-child(3n+1) { background: var(--sun-soft); }
.yn { display: grid; gap: 1.2rem; }
@media (min-width: 860px) { .yn { grid-template-columns: 1fr 1fr; } }
.yn > div { padding: 1.4rem 1.5rem; border: 3px solid var(--sun); }
.yn h3 { font-size: 1.25rem; }
.map-wrap { position: relative; }
.map-z { display: block; width: 100%; height: clamp(360px, 42vw, 480px); border: 3px solid var(--navy); background: var(--cream); }
.map-card { position: relative; margin-top: -3rem; margin-left: 1rem; max-width: 420px; padding: 1.3rem 1.4rem; background: var(--sun); border: 3px solid var(--navy); box-shadow: 6px 6px 0 var(--navy); }
.map-card h2 { font-size: 1.4rem; }
.map-card ul { margin: 0.6rem 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0.3rem 0.9rem; font-size: var(--f-sm); font-weight: 600; color: var(--navy); }

/* 08 Duct check (signature) */
.check { display: grid; gap: 2rem; padding: clamp(1.4rem, 1rem + 2vw, 2.6rem); background: var(--white); border: 3px solid var(--navy); box-shadow: 8px 8px 0 var(--sun); }
@media (min-width: 900px) { .check { grid-template-columns: 1.1fr 0.9fr; } }
.check > * { min-width: 0; }
.check fieldset { margin: 0; padding: 0; border: 0; }
.check legend { margin-bottom: 0.8rem; font-size: 1.2rem; font-weight: 700; color: var(--navy); }
.tick { display: flex; gap: 0.8rem; align-items: flex-start; padding: 0.8rem 0; border-bottom: 1px solid var(--line); cursor: pointer; }
.tick input { width: 22px; height: 22px; margin-top: 0.15rem; accent-color: var(--navy); flex: none; }
.tick span b { display: block; }
.tick span small { color: var(--muted); font-size: var(--f-sm); }
.verdict { align-self: start; padding: 1.4rem; background: var(--navy); color: #d2d8e4; }
.verdict h3 { color: var(--sun); font-size: 1.35rem; }
.verdict p { margin: 0; }
.check:not(.is-live) .verdict { display: none; }
.two-col { display: grid; gap: 1.4rem; }
@media (min-width: 860px) { .two-col { grid-template-columns: 1fr 1fr; } }
.col-card { padding: 1.5rem; background: var(--white); border: 3px solid var(--navy); }
.col-card--yes { box-shadow: 6px 6px 0 var(--sun); }
.col-card h3 { font-size: 1.3rem; }
.warnbox { padding: 1.3rem 1.5rem; background: var(--sun-soft); border-left: 8px solid var(--navy); }
.warnbox p { margin: 0; }

/* 09 FAQ */
.faq { display: grid; gap: 0.8rem; max-width: 900px; }
.zq { background: var(--white); border: 3px solid var(--navy); }
.zq summary { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding: 1rem 1.2rem; font-weight: 700; font-size: 1.1rem; color: var(--navy); list-style: none; }
.zq summary::after { content: "+"; flex: none; display: grid; place-items: center; width: 32px; height: 32px; background: var(--sun); border: 2px solid var(--navy); font-size: 1.3rem; line-height: 1; }
.zq[open] summary::after { content: "–"; }
.zq > div { padding: 0 1.2rem 1.1rem; }

/* 10 Form & contact */
.form { display: grid; gap: 1rem 1.2rem; margin-top: 1.4rem; }
@media (min-width: 680px) { .form--2col { grid-template-columns: 1fr 1fr; } }
.field--full, .form__end { grid-column: 1 / -1; }
.field label { font-weight: 700; font-size: var(--f-sm); color: var(--navy); }
.req { color: var(--sun-ink); }
.opt { font-weight: 400; color: var(--muted); }
input[type="text"], input[type="tel"], input[type="email"], select, textarea { width: 100%; padding: 0.8rem 0.9rem; font: inherit; color: var(--navy); background: var(--white); border: 2px solid var(--navy); border-radius: 0; }
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='%2314213d' stroke-width='2.8'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 0.8rem center; background-size: 16px; padding-right: 2.4rem; }
textarea { min-height: 130px; resize: vertical; }
input:focus, select:focus, textarea:focus { background: var(--sun-soft); }
.form-status { margin: 0.8rem 0 0; }
.form-note { margin: 0.5rem 0 0; font-size: 0.85rem; color: var(--muted); }
.contact { display: grid; gap: 2rem; }
@media (min-width: 940px) { .contact { grid-template-columns: 1.15fr 0.85fr; align-items: start; } }
.contact > * { min-width: 0; }
.cblock { padding: 1.4rem; background: var(--navy); color: #d2d8e4; margin-bottom: 1rem; }
.cblock h2 { color: var(--sun); font-size: 0.95rem; letter-spacing: 0.1em; text-transform: uppercase; }
.cblock .num { font-size: clamp(1.8rem, 1.5rem + 1.2vw, 2.4rem); font-weight: 700; color: #fff; text-decoration: none; }
.cblock a { color: #fff; }
.cblock :focus-visible { outline-color: var(--sun); }
.cblock--light { background: var(--sun-soft); color: var(--text); border: 3px solid var(--navy); }
.cblock--light h2 { color: var(--navy); }
.cblock--light a { color: var(--navy); }

/* 11 Footer */
.ftr { background: var(--navy); color: #aeb7c8; font-size: var(--f-sm); border-top: 8px solid var(--sun); }
.ftr__grid { display: grid; gap: 2rem; padding-block: 2.8rem 1.6rem; }
@media (min-width: 820px) { .ftr__grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.ftr h2 { margin-bottom: 0.7rem; font-size: 1.05rem; color: var(--sun); }
.ftr ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.4rem; }
.ftr a { color: #fff; text-decoration: none; }
.ftr a:hover { color: var(--sun); }
.ftr :focus-visible { outline-color: var(--sun); }
.ftr__base { padding-block: 1.1rem; border-top: 1px solid var(--navy-2); font-size: 0.82rem; }
.ftr__base p { margin: 0; max-width: none; }

/* 12 Images */
.img-placeholder { background: var(--cream); border: 2px dashed #c9bf9a; color: var(--muted); }
.img-placeholder b { color: var(--navy); }
figure img, figure .img-placeholder { border-radius: 0; }
figcaption { margin-top: 0.5rem; font-size: 0.88rem; color: var(--muted); }
.mt { margin-top: 2rem; }

.check.is-live + .nojs-note { display: none; }