/* 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; } }

/* ==========================================================================
   SilverOak HVACworks — silveroakhvac.xyz
   Workshop calm: brushed silver greys, warm oak brown, a serif display face.
   01 Tokens · 02 Base · 03 Header · 04 Buttons · 05 Hero · 06 Page heads
   07 Sections & benches · 08 Spec table · 09 Wire checker (signature)
   10 FAQ · 11 Form & contact · 12 Footer · 13 Images
   ========================================================================== */

/* 01 Tokens */
:root {
  --ink: #1f2326; --text: #3a4046; --muted: #5d656c; --rule: #d5d9dc;
  --white: #ffffff; --silver-50: #f4f5f6; --silver-100: #e8ebed; --silver-300: #b9c0c6; --steel: #2b3238;
  --oak: #8b5e34; --oak-dark: #6f4a28; --oak-soft: #f3ebe2; --oak-light: #d9b48f;
  --focus: #8b5e34; --err: #b42318; --ok: #256b3a;
  --serif: "Gloock", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --f-sm: 0.94rem; --f0: clamp(1rem, 0.97rem + 0.18vw, 1.1rem); --f1: clamp(1.25rem, 1.12rem + 0.55vw, 1.6rem);
  --f2: clamp(1.9rem, 1.45rem + 1.9vw, 3rem); --f3: clamp(2.5rem, 1.75rem + 3.4vw, 4.8rem);
  --wrap: 1160px; --pad-y: clamp(3.4rem, 2.4rem + 4.2vw, 6.4rem); --r: 4px;
}

/* 02 Base */
body { background: var(--silver-50); color: var(--text); font-family: var(--sans); font-size: var(--f0); line-height: 1.65; }
h1, h2, h3 { margin: 0 0 0.45em; color: var(--ink); font-weight: 400; line-height: 1.1; text-wrap: balance; }
h1, h2 { font-family: var(--serif); }
h1 { font-size: var(--f3); }
h2 { font-size: var(--f2); }
h3 { font-family: var(--sans); font-size: 1.15rem; font-weight: 700; line-height: 1.3; }
p { margin: 0 0 1em; max-width: 64ch; }
p:last-child { margin-bottom: 0; }
a { color: var(--oak-dark); text-underline-offset: 3px; }
a:hover { color: var(--ink); }
strong, b { color: var(--ink); font-weight: 700; }
ul, ol { margin: 0 0 1em; padding-left: 1.2em; }
.wrap { width: min(100% - 2rem, var(--wrap)); margin-inline: auto; }
.kicker { display: block; margin-bottom: 0.8rem; font-size: 0.8rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--oak-dark); }

/* 03 Header */
.hd { position: sticky; top: 0; z-index: 30; background: var(--white); border-bottom: 1px solid var(--rule); }
.hd .wrap { position: relative; display: flex; align-items: center; gap: 1rem; min-height: 82px; }
.brand { display: flex; align-items: center; gap: 0.7rem; }
.brand__mark { flex: none; width: 38px; height: 38px; }
.brand__txt { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name { color: var(--ink); font-family: var(--serif); font-size: 1.45rem; text-decoration: none; }
.brand__name span { color: var(--oak); }
.brand__tel { display: inline-flex; align-items: center; gap: 0.3rem; min-height: 26px; color: var(--oak-dark); font-size: 0.92rem; font-weight: 700; text-decoration: none; white-space: nowrap; }
.brand__tel svg { width: 14px; height: 14px; }
.brand__tel:hover { color: var(--ink); text-decoration: underline; }
.mainnav { display: none; }
.hd__end { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; }
.nav-toggle { display: inline-grid; place-items: center; width: 44px; height: 44px; border: 1px solid var(--silver-300); border-radius: var(--r); background: var(--white); color: var(--ink); cursor: pointer; }
.nav-toggle svg { width: 22px; height: 22px; }
.hd .cta-short { display: none; }
@media (max-width: 979px) {
  .mainnav { position: absolute; top: 100%; left: -1rem; right: -1rem; flex-direction: column; padding: 0.6rem 1.2rem 1.4rem; background: var(--white); border-bottom: 3px solid var(--oak); box-shadow: 0 20px 30px -24px rgba(31,35,38,0.5); }
  .mainnav.is-open { display: flex; }
  .mainnav a { padding: 0.9rem 0; border-bottom: 1px solid var(--silver-100); color: var(--ink); text-decoration: none; font-family: var(--serif); font-size: 1.4rem; }
  .mainnav a[aria-current="page"] { color: var(--oak-dark); }
  .mainnav a[aria-current="page"]::before { content: "— "; color: var(--oak); }
}
@media (max-width: 440px) {
  .hd .cta-long { display: none; }
  .hd .cta-short { display: inline; }
  .brand__mark { width: 32px; height: 32px; }
  .brand__name { font-size: 1.25rem; }
  .hd .hd__cta { padding: 0.7rem 0.95rem; }
}
@media (min-width: 980px) {
  .nav-toggle { display: none; }
  .mainnav { display: flex; gap: 0.3rem; margin-left: auto; }
  .mainnav a { position: relative; padding: 0.6rem 0.8rem; color: var(--ink); text-decoration: none; font-weight: 600; font-size: 0.97rem; }
  .mainnav a:hover { color: var(--oak-dark); }
  .mainnav a[aria-current="page"]::after { content: ""; position: absolute; left: 0.8rem; right: 0.8rem; bottom: 0.15rem; height: 3px; background: var(--oak); }
  .hd__end { margin-left: 0.8rem; }
}

/* 04 Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.85rem 1.35rem; border: 1px solid transparent; border-radius: var(--r); font: inherit; font-weight: 700; text-decoration: none; white-space: nowrap; cursor: pointer; transition: background-color 0.2s, color 0.2s, border-color 0.2s; }
.btn svg { width: 1em; height: 1em; }
.btn--oak { background: var(--oak); color: #fff; }
.btn--oak:hover { background: var(--oak-dark); color: #fff; }
.btn--line { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn--line:hover { background: var(--ink); color: #fff; }
.btn--white { background: #fff; color: var(--ink); }
.btn--white:hover { background: var(--oak-soft); color: var(--ink); }
.btns { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-top: 1.6rem; }

/* 05 Hero — full-bleed photo with an overlapping card */
.hero { position: relative; background: var(--steel); }
.hero__img img, .hero__img .img-placeholder { width: 100%; height: clamp(300px, 52vw, 620px); object-fit: cover; border-radius: 0; }
.hero__img .img-placeholder { background: #d9dde0; border: 0; }
.hero__card { position: relative; z-index: 2; margin-top: -4rem; padding: clamp(1.6rem, 1.1rem + 2.4vw, 3rem); background: var(--white); border-top: 4px solid var(--oak); box-shadow: 0 30px 50px -36px rgba(31,35,38,0.6); }
.hero__card h1 { max-width: 15ch; }
.hero__card p.lede { font-size: var(--f1); line-height: 1.45; color: var(--ink); max-width: 40ch; }
@media (min-width: 900px) { .hero__card { width: min(64%, 720px); margin-top: -12rem; } }
.hero-wrap { padding-bottom: clamp(2rem, 1.5rem + 2vw, 3.5rem); background: var(--silver-50); }

/* 06 Page heads */
.phead { background: var(--white); border-bottom: 1px solid var(--rule); }
.phead .wrap { display: grid; gap: 1.2rem 3rem; padding-block: clamp(2.4rem, 2rem + 2.6vw, 4.4rem); }
@media (min-width: 900px) { .phead .wrap { grid-template-columns: 1.2fr 0.8fr; align-items: end; } }
.phead h1 { font-size: clamp(2.2rem, 1.6rem + 2.6vw, 3.8rem); margin: 0; }
.phead p { margin: 0; font-size: 1.1rem; }
.crumbs { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0; padding: 0; list-style: none; font-size: 0.88rem; color: var(--muted); }
.crumbs li + li::before { content: "/"; margin-right: 0.5rem; color: var(--silver-300); }

/* 07 Sections & benches */
.sec { padding-block: var(--pad-y); }
.sec--white { background: var(--white); }
.sec--steel { background: var(--steel); color: #cdd3d8; }
.sec--steel h2, .sec--steel h3 { color: #fff; }
.sec--steel .kicker { color: var(--oak-light); }
.sec--steel a:not(.btn) { color: var(--oak-light); }
.sec--steel :focus-visible { outline-color: var(--oak-light); }
.intro { max-width: 720px; margin-bottom: 2.6rem; }
.benches { display: grid; gap: 1.6rem; }
@media (min-width: 860px) { .benches { grid-template-columns: 1fr 1fr; } }
.bench { display: flex; flex-direction: column; background: var(--white); border: 1px solid var(--rule); }
.bench figure img, .bench figure .img-placeholder { border-radius: 0; }
.bench__body { display: flex; flex-direction: column; gap: 0.6rem; flex: 1; padding: 1.6rem 1.6rem 1.8rem; }
.bench__body h3 { font-family: var(--serif); font-weight: 400; font-size: var(--f1); }
.bench__body ul { margin: 0; padding: 0; list-style: none; }
.bench__body li { padding: 0.45rem 0; border-bottom: 1px dashed var(--rule); }
.bench__body .btn { align-self: flex-start; margin-top: auto; }
.split { display: grid; gap: 2.4rem; align-items: center; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; } }
.split > * { min-width: 0; }
.split--top { align-items: start; }
.numbered { margin: 0; padding: 0; list-style: none; counter-reset: n; }
.numbered li { position: relative; padding: 1.1rem 0 1.1rem 3.6rem; border-top: 1px solid var(--rule); counter-increment: n; }
.sec--steel .numbered li { border-color: rgba(255,255,255,0.14); }
.numbered li::before { content: counter(n, decimal-leading-zero); position: absolute; left: 0; top: 0.9rem; font-family: var(--serif); font-size: 1.7rem; color: var(--oak); line-height: 1; }
.sec--steel .numbered li::before { color: var(--oak-light); }
.numbered h3 { margin-bottom: 0.25rem; }
.numbered p { margin: 0; font-size: var(--f-sm); }
.area-line { margin: 1rem 0 0; font-size: 1.05rem; line-height: 1.9; }
.area-line span + span::before { content: " · "; color: var(--oak); }

/* 08 Spec table */
.scroll { overflow-x: auto; }
.spec { width: 100%; min-width: 560px; border-collapse: collapse; background: var(--white); }
.spec caption { text-align: left; }
.spec th, .spec td { padding: 0.95rem 1rem; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; font-size: var(--f-sm); }
.spec thead th { border-bottom: 3px solid var(--ink); font-size: 0.8rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink); }
.spec tbody th { font-weight: 700; color: var(--ink); width: 30%; }
.spec td.y::before { content: "●"; margin-right: 0.45rem; color: var(--oak); }
.spec td.n { color: var(--muted); }

/* 09 Wire checker (signature) */
.wires { padding: clamp(1.4rem, 1rem + 2vw, 2.4rem); background: var(--white); border: 1px solid var(--rule); border-top: 4px solid var(--oak); }
.wires fieldset { margin: 0; padding: 0; border: 0; }
.wires legend { margin-bottom: 0.4rem; font-family: var(--serif); font-size: var(--f1); color: var(--ink); }
.terms { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 0.5rem; margin-top: 1rem; }
.term { position: relative; }
.term input { position: absolute; opacity: 0; }
.term span { display: flex; flex-direction: column; align-items: center; gap: 0.15rem; padding: 0.7rem 0.4rem; border: 1px solid var(--silver-300); border-radius: var(--r); background: var(--silver-50); cursor: pointer; text-align: center; }
.term b { font-family: var(--serif); font-weight: 400; font-size: 1.5rem; line-height: 1; }
.term small { font-size: 0.74rem; color: var(--muted); }
.term input:checked + span { background: var(--oak); border-color: var(--oak); }
.term input:checked + span b, .term input:checked + span small { color: #fff; }
.term input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.line-v { display: flex; gap: 0.7rem; align-items: flex-start; margin-top: 1rem; padding: 0.8rem 1rem; background: var(--oak-soft); cursor: pointer; }
.line-v input { width: 1.15rem; height: 1.15rem; margin-top: 0.2rem; flex: none; accent-color: var(--oak); }
.readout { margin-top: 1.4rem; padding: 1.3rem 1.4rem; background: var(--steel); color: #dfe4e8; }
.readout[hidden] { display: none; }
.readout .verdict { margin: 0; color: #fff; font-family: var(--serif); font-size: 1.45rem; line-height: 1.2; }
.readout ul { margin: 0.6rem 0 0; padding-left: 1.1rem; }
.readout li { margin: 0.3rem 0; }
.readout li::marker { color: var(--oak-light); }
.warn { padding: 1.2rem 1.4rem; border-left: 4px solid var(--oak); background: var(--oak-soft); color: var(--ink); }
.terms-key { display: grid; gap: 0; margin: 0; }
@media (min-width: 700px) { .terms-key { grid-template-columns: 1fr 1fr; column-gap: 2rem; } }
.terms-key div { display: grid; grid-template-columns: 4rem 1fr; gap: 0.8rem; padding: 0.7rem 0; border-bottom: 1px solid var(--rule); }
.terms-key dt { font-family: var(--serif); font-size: 1.3rem; color: var(--oak-dark); }
.terms-key dd { margin: 0; font-size: var(--f-sm); }

/* 10 FAQ */
.faq { display: grid; gap: 0 2.4rem; }
@media (min-width: 900px) { .faq { grid-template-columns: 1fr 1fr; } }
.oq { border-top: 1px solid var(--rule); }
.oq summary { display: flex; justify-content: space-between; gap: 1rem; padding: 1.1rem 0; font-weight: 700; color: var(--ink); cursor: pointer; list-style: none; }
.oq summary::after { content: "+"; flex: none; font-family: var(--serif); font-size: 1.6rem; line-height: 0.8; color: var(--oak); }
.oq[open] summary::after { content: "−"; }
.oq > div { padding: 0 0 1.2rem; font-size: var(--f-sm); }

/* 11 Form & contact */
.form { display: grid; gap: 1.1rem; margin-top: 1.4rem; }
.field--full, .form__end { grid-column: 1 / -1; }
.field label { font-weight: 700; color: var(--ink); font-size: 0.95rem; }
.req { color: var(--oak-dark); }
.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 var(--silver-300); border-bottom: 2px solid var(--ink); border-radius: var(--r) var(--r) 0 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='%238b5e34' stroke-width='2.5'%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: 16px; padding-right: 2.4rem; }
textarea { min-height: 140px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-bottom-color: var(--oak); }
.form-status { margin: 0.8rem 0 0; }
.form-note { margin: 0.5rem 0 0; font-size: 0.86rem; color: var(--muted); }
.formcard { padding: clamp(1.5rem, 1rem + 2vw, 2.6rem); background: var(--white); border: 1px solid var(--rule); }
.factcard { padding: clamp(1.5rem, 1rem + 2vw, 2.4rem); background: var(--steel); color: #cdd3d8; }
.factcard a:not(.big) { color: var(--oak-light); }
.factcard :focus-visible { outline-color: var(--oak-light); }
.facts { margin: 0; }
.facts div:first-child { border-top: 0; padding-top: 0; }
.facts div { padding: 1.1rem 0; border-top: 1px solid rgba(255,255,255,0.16); }
.facts dt { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--oak-light); }
.facts dd { margin: 0.2rem 0 0; color: #fff; }
.facts .big { font-family: var(--serif); font-size: 2rem; color: #fff; text-decoration: none; }
.map-frame { width: 100%; height: clamp(300px, 38vw, 440px); border: 0; display: block; filter: grayscale(0.35); }

/* 12 Footer */
.ft { background: var(--white); border-top: 4px solid var(--oak); font-size: var(--f-sm); }
.ft .wrap { display: grid; gap: 2rem; padding-block: 3rem 1.6rem; }
@media (min-width: 820px) { .ft .wrap { grid-template-columns: 2fr 1fr 1fr; } }
.ft__name { font-family: var(--serif); font-size: 2rem; color: var(--ink); line-height: 1; margin-bottom: 0.6rem; }
.ft__name span { color: var(--oak); }
.ft h2 { font-family: var(--sans); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.ft ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.4rem; }
.ft__base { grid-column: 1 / -1; padding-top: 1.2rem; border-top: 1px solid var(--rule); font-size: 0.85rem; color: var(--muted); }
.ft__base p { margin: 0; max-width: none; }

/* 13 Images */
.img-placeholder { background: var(--silver-100); border: 1px dashed var(--silver-300); color: var(--muted); }
.img-placeholder b { color: var(--ink); }
figure img, figure .img-placeholder { border-radius: var(--r); }
figcaption { margin-top: 0.5rem; font-size: 0.88rem; color: var(--muted); }
.mt { margin-top: 2rem; }