/* Dencher Consulting Engineers — site styles */
@font-face { font-family: "Barlow"; font-weight: 300; font-style: normal; font-display: swap; src: url("../fonts/barlow-light.woff") format("woff"); }
@font-face { font-family: "Barlow"; font-weight: 400; font-style: normal; font-display: swap; src: url("../fonts/barlow-regular.woff") format("woff"); }
@font-face { font-family: "Barlow"; font-weight: 500; font-style: normal; font-display: swap; src: url("../fonts/barlow-medium.woff") format("woff"); }
:root {
  /* Brand, taken from the logo */
  --blue: #0a95d3;          /* logo blue: large type, lines, fills */
  --blue-ink: #06699a;      /* text-safe blue on white (AA) */
  --blue-deep: #064a6e;     /* dark panels */
  --charcoal: #343537;      /* logo grey: body text */
  --mortar: #d2d3d5;        /* logo ground: rules, surfaces */
  --stone: #eef0f1;         /* quiet section ground */
  --paper: #ffffff;
  --muted: #5b5d60;         /* secondary text (AA on white and stone) */

  --font: "Barlow", "Helvetica Neue", Arial, sans-serif;

  --step--1: 0.9375rem;
  --step-0: 1.0625rem;
  --step-1: 1.3125rem;
  --step-2: 1.75rem;
  --step-3: clamp(2rem, 1.4rem + 2.2vw, 2.75rem);
  --step-4: clamp(2.5rem, 1.5rem + 3.6vw, 4.25rem);

  --gutter: clamp(1.25rem, 4vw, 3rem);
  --wrap: 72rem;
  --section: clamp(4rem, 8vw, 7.5rem);
  --ease: cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--charcoal);
  background: var(--paper);
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue-ink); text-underline-offset: .18em; text-decoration-thickness: 1px; }
a:hover { color: var(--blue-deep); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; border-radius: 2px; }
h1, h2, h3 { font-weight: 300; line-height: 1.12; color: var(--blue-deep); margin: 0; letter-spacing: -0.01em; text-wrap: balance; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-1); font-weight: 500; letter-spacing: 0; color: var(--charcoal); }
p { margin: 0 0 1em; max-width: 68ch; }

.wrap { width: 100%; max-width: calc(var(--wrap) + 2 * var(--gutter)); margin-inline: auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: -999px; top: 0; background: var(--blue-deep); color: #fff; padding: .75rem 1rem; z-index: 100; }
.skip:focus { left: 1rem; top: 1rem; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Header ---------- */
.utility { font-size: var(--step--1); border-bottom: 1px solid var(--stone); }
.utility .wrap { display: flex; justify-content: flex-end; gap: 1.5rem; padding-block: .55rem; flex-wrap: wrap; }
.utility a { text-decoration: none; color: var(--blue-deep); display: inline-flex; align-items: center; gap: .45rem; min-height: 32px; }
.utility a:hover { text-decoration: underline; }
.utility svg { width: 16px; height: 16px; flex: none; }

.masthead { position: sticky; top: 0; z-index: 50; background: rgba(255,255,255,.96); backdrop-filter: saturate(1.4) blur(8px); box-shadow: 0 1px 0 var(--stone); }
.masthead .wrap { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding-block: 1rem; }
.brand { display: block; line-height: 0; }
.brand img { width: 168px; height: auto; }
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: clamp(1.25rem, 3vw, 2.75rem); align-items: center; }
.nav a { font-size: 1.125rem; color: var(--blue-deep); text-decoration: none; padding: .5rem 0; position: relative; display: inline-block; }
.nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: .15rem; height: 2px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .25s var(--ease); }
.nav a:hover::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav .nav-cta { border: 1.5px solid var(--blue); border-radius: 999px; padding: .5rem 1.25rem; }
.nav .nav-cta::after { display: none; }
.nav .nav-cta:hover { background: var(--blue-deep); border-color: var(--blue-deep); color: #fff; }
.menu-toggle { display: none; background: none; border: 1.5px solid var(--mortar); border-radius: 999px; padding: .55rem 1rem; font: inherit; color: var(--blue-deep); cursor: pointer; min-height: 44px; }

@media (max-width: 820px) {
  .menu-toggle { display: inline-flex; align-items: center; gap: .5rem; }
  .nav { position: absolute; left: 0; right: 0; top: 100%; background: #fff; box-shadow: 0 12px 24px rgba(6, 74, 110, .12); display: none; }
  .nav.is-open { display: block; }
  .nav ul { flex-direction: column; align-items: stretch; gap: 0; padding: .5rem var(--gutter) 1.25rem; }
  .nav a { display: block; padding: .9rem 0; border-bottom: 1px solid var(--stone); }
  .nav a::after { display: none; }
  .nav .nav-cta { margin-top: 1rem; text-align: center; border-bottom: 1.5px solid var(--blue); }
  .brand img { width: 140px; }
}

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .6rem; min-height: 48px; padding: .7rem 1.6rem; border-radius: 999px; font: 500 1.0625rem/1 var(--font); text-decoration: none; cursor: pointer; transition: background-color .2s, color .2s, border-color .2s; border: 1.5px solid var(--blue); color: var(--blue-deep); background: transparent; }
.btn:hover { background: var(--blue-deep); border-color: var(--blue-deep); color: #fff; }
.btn-solid { background: var(--blue-deep); border-color: var(--blue-deep); color: #fff; }
.btn-solid:hover { background: var(--charcoal); border-color: var(--charcoal); }
.btn-light { border-color: rgba(255,255,255,.7); color: #fff; }
.btn-light:hover { background: #fff; color: var(--blue-deep); border-color: #fff; }
.actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2rem; }

/* ---------- Datum line: the site's signature device ----------
   A dimension line, as on a structural drawing, running in from the
   page edge to the start of each opening heading. */
.datum { position: relative; }
.datum::before {
  content: ""; position: absolute; right: calc(100% + 1.75rem); top: .62em;
  width: 100vw; height: 1px; background: var(--charcoal); opacity: .55;
}
.datum::after {
  content: ""; position: absolute; right: calc(100% + 1.75rem); top: calc(.62em - 6px);
  width: 1px; height: 13px; background: var(--charcoal); opacity: .7;
}
@media (max-width: 820px) { .datum::before, .datum::after { display: none; } }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; background: linear-gradient(115deg, #fff 30%, #e7f3f9 70%, #f1f4f6 100%); }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); align-items: center; min-height: clamp(34rem, 78vh, 46rem); padding-block: 4rem; }
.hero h1 { font-size: clamp(2.3rem, 1.3rem + 3.2vw, 3.9rem); font-weight: 300; }
.hero h1 span { display: block; }
.hero .lede { font-size: var(--step-1); color: var(--blue-deep); margin-top: 1.75rem; max-width: 34ch; line-height: 1.45; }
.hero-disc {
  position: absolute; top: 50%; right: calc(-1 * clamp(4rem, 9vw, 9rem));
  width: clamp(26rem, 46vw, 40rem); aspect-ratio: 1; border-radius: 50%; overflow: hidden;
  transform: translateY(-46%);
  box-shadow: 0 30px 60px -30px rgba(6, 74, 110, .45);
}
.hero-disc img { width: 100%; height: 100%; object-fit: cover; object-position: 38% 50%; }
.hero-disc figcaption { position: absolute; left: 22%; bottom: 13%; right: 22%; color: #fff; font-size: var(--step--1); text-shadow: 0 1px 3px rgba(0,0,0,.6); }
@media (max-width: 900px) {
  .hero .wrap { grid-template-columns: 1fr; min-height: 0; padding-block: 3rem 0; }
  .hero-disc { position: relative; top: auto; right: auto; transform: none; width: min(88vw, 26rem); margin: 3rem -2rem -3rem auto; }
  .hero { padding-bottom: 0; }
}

/* Page load: the only orchestrated motion on the site */
@media (prefers-reduced-motion: no-preference) {
  .hero h1 span, .hero .lede, .hero .actions { opacity: 0; transform: translateY(14px); animation: rise .8s var(--ease) forwards; }
  .hero h1 span:nth-child(2) { animation-delay: .12s; }
  .hero .lede { animation-delay: .28s; }
  .hero .actions { animation-delay: .4s; }
  .hero-disc img { transform: scale(1.08); animation: settle 1.6s var(--ease) forwards; }
  .datum::before { transform-origin: right; animation: draw .9s var(--ease) both; }
  @keyframes rise { to { opacity: 1; transform: none; } }
  @keyframes settle { to { transform: scale(1); } }
  @keyframes draw { from { transform: scaleX(0); } }
}

/* ---------- Sections ---------- */
.section { padding-block: var(--section); }
.section-stone { background: var(--stone); }
.section-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2rem 4rem; align-items: end; margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-head p { color: var(--muted); margin: 0; }
@media (max-width: 820px) { .section-head { grid-template-columns: 1fr; } }

/* Disciplines */
.disciplines { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--mortar); }
.discipline { padding: 2.25rem 2rem 2rem 0; border-right: 1px solid var(--mortar); }
.discipline + .discipline { padding-left: 2rem; }
.discipline:last-child { border-right: 0; }
.discipline svg { width: 88px; height: 72px; color: var(--blue); margin-bottom: 1.5rem; overflow: visible; }
.discipline h3 { font-size: var(--step-2); font-weight: 300; color: var(--blue-deep); margin-bottom: .75rem; }
.discipline p { color: var(--muted); }
@media (max-width: 820px) {
  .disciplines { grid-template-columns: 1fr; }
  .discipline, .discipline + .discipline { padding: 2rem 0; border-right: 0; border-bottom: 1px solid var(--mortar); }
}
@media (prefers-reduced-motion: no-preference) {
  .js .discipline svg .draw { stroke-dasharray: var(--len, 300); stroke-dashoffset: var(--len, 300); transition: stroke-dashoffset 1.4s var(--ease); }
  .js .discipline.is-seen svg .draw { stroke-dashoffset: 0; }
  .js .discipline:nth-child(2) svg .draw { transition-delay: .15s; }
  .js .discipline:nth-child(3) svg .draw { transition-delay: .3s; }
}

.services { display: flex; flex-wrap: wrap; gap: .75rem 2.5rem; margin-top: 2.5rem; padding-top: 1.5rem; color: var(--muted); }
.services strong { color: var(--charcoal); font-weight: 500; }

/* Building types: split feature */
.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(1.5rem, 4vw, 3.5rem); }
.feature figure { margin: 0 0 1.75rem; border-radius: 0 0 0 clamp(6rem, 14vw, 11rem); overflow: hidden; aspect-ratio: 16 / 10; background: var(--mortar); }
.feature:nth-child(2) figure { border-radius: 0 clamp(6rem, 14vw, 11rem) 0 0; }
.feature figure img { width: 100%; height: 100%; object-fit: cover; }
.feature h3 { font-size: var(--step-2); font-weight: 300; color: var(--blue-deep); margin-bottom: .75rem; }
@media (max-width: 820px) { .split { grid-template-columns: 1fr; } }

/* Facts band */
.facts { background: var(--blue-deep); color: #fff; }
.facts .wrap { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 3rem; align-items: center; padding-block: clamp(3.5rem, 7vw, 6rem); }
.facts h2 { color: #fff; }
.facts dl { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem 2.5rem; margin: 0; }
.facts dt { font-size: var(--step-3); font-weight: 300; line-height: 1; color: #fff; }
.facts dd { margin: .6rem 0 0; color: #cfe6f2; font-size: var(--step--1); line-height: 1.45; }
.facts .fact { border-top: 1px solid rgba(255,255,255,.28); padding-top: 1.1rem; }
@media (max-width: 820px) { .facts .wrap { grid-template-columns: 1fr; } }
@media (max-width: 420px) { .facts dl { grid-template-columns: 1fr; } }

/* Work strip */
.work { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 1rem; }
.work figure { margin: 0; position: relative; overflow: hidden; background: var(--mortar); }
.work figure:first-child { grid-row: span 2; }
.work img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 10; }
.work figure:first-child img { aspect-ratio: auto; min-height: 100%; }
.work figcaption { position: absolute; inset: auto 0 0 0; padding: 2.5rem 1rem .9rem; color: #fff; font-size: var(--step--1); line-height: 1.35; background: linear-gradient(transparent, rgba(3, 30, 45, .82)); }
@media (max-width: 820px) {
  .work { grid-template-columns: 1fr 1fr; }
  .work figure:first-child { grid-column: 1 / -1; grid-row: auto; }
  .work figure:first-child img { aspect-ratio: 16 / 10; }
}
@media (max-width: 480px) { .work { grid-template-columns: 1fr; } }

/* Enquiry band */
.enquire { padding-block: var(--section); }
.enquire .wrap { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 2rem 4rem; align-items: end; }
.enquire h2 { font-size: var(--step-4); }
.enquire p { font-size: var(--step-1); color: var(--charcoal); }
@media (max-width: 820px) { .enquire .wrap { grid-template-columns: 1fr; } }

/* ---------- Inner pages ---------- */
.page-hero { background: linear-gradient(115deg, #fff 35%, #e7f3f9 100%); padding-block: clamp(3.5rem, 8vw, 6.5rem) clamp(3rem, 6vw, 5rem); position: relative; overflow: hidden; }
.page-hero h1 { font-size: var(--step-4); }
.page-hero .lede { font-size: var(--step-1); color: var(--blue-deep); margin-top: 1.5rem; max-width: 40ch; line-height: 1.45; }
.page-hero .arc { position: absolute; right: -4rem; top: 50%; transform: translateY(-50%); width: clamp(16rem, 25vw, 22rem); aspect-ratio: 1; border-radius: 50%; overflow: hidden; box-shadow: 0 30px 60px -30px rgba(6, 74, 110, .45); }
.page-hero .arc img { width: 100%; height: 100%; object-fit: cover; }
.page-hero .has-arc { max-width: 58%; }
@media (max-width: 900px) { .page-hero .arc { display: none; } .page-hero .has-arc { max-width: none; } }

.prose { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 2rem 5rem; }
.prose h2 { font-size: var(--step-3); }
.prose .body p:first-child { font-size: var(--step-1); line-height: 1.5; color: var(--charcoal); }
.prose + .prose { margin-top: var(--section); }
@media (max-width: 820px) { .prose { grid-template-columns: 1fr; } }

.pullquote { margin: 2.5rem 0; padding: 0 0 0 1.5rem; border-left: 3px solid var(--blue); font-size: var(--step-2); font-weight: 300; line-height: 1.35; color: var(--blue-deep); max-width: 34ch; }

.inset-photo { margin: 2.5rem 0 0; }
.inset-photo img { border-radius: 0 0 0 7rem; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.inset-photo figcaption { font-size: var(--step--1); color: var(--muted); margin-top: .75rem; }

.aside-panel { background: var(--stone); padding: 2rem; border-top: 3px solid var(--blue); }
.aside-panel h3 { margin-bottom: .75rem; }
.aside-panel p:last-child { margin-bottom: 0; }

/* Process: a real sequence, so it's numbered */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); counter-reset: step; }
.steps li { counter-increment: step; padding: 0 1.5rem 0 0; position: relative; }
.steps li::before { content: counter(step); display: grid; place-items: center; width: 3rem; height: 3rem; border-radius: 50%; border: 1.5px solid var(--blue); color: var(--blue-deep); font-size: 1.25rem; background: #fff; position: relative; z-index: 1; margin-bottom: 1.5rem; }
.steps li::after { content: ""; position: absolute; top: 1.5rem; left: 3rem; right: 0; height: 1px; background: var(--mortar); }
.steps li:last-child::after { display: none; }
.steps h3 { margin-bottom: .5rem; }
.steps p { color: var(--muted); font-size: var(--step--1); }
@media (max-width: 900px) {
  .steps { grid-template-columns: 1fr; gap: 0; }
  .steps li { padding: 0 0 2rem 4.5rem; }
  .steps li::before { position: absolute; left: 0; top: 0; margin: 0; }
  .steps li::after { top: 3rem; bottom: 0; left: 1.5rem; right: auto; width: 1px; height: auto; }
}

/* FAQ */
.faq { border-top: 1px solid var(--mortar); max-width: 56rem; }
.faq details { border-bottom: 1px solid var(--mortar); }
.faq summary { list-style: none; cursor: pointer; padding: 1.4rem 3rem 1.4rem 0; font-size: var(--step-1); color: var(--blue-deep); position: relative; min-height: 44px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: .5rem; top: 50%; width: 14px; height: 14px; border-right: 1.5px solid var(--blue); border-bottom: 1.5px solid var(--blue); transform: translateY(-70%) rotate(45deg); transition: transform .25s var(--ease); }
.faq details[open] summary::after { transform: translateY(-30%) rotate(225deg); }
.faq summary:hover { color: var(--charcoal); }
.faq .answer { padding: 0 3rem 1.5rem 0; color: var(--charcoal); }

/* Contact */
.contact-list { list-style: none; margin: 0 0 2rem; padding: 0; }
.contact-list li { padding: 1.25rem 0; border-bottom: 1px solid var(--mortar); display: grid; grid-template-columns: 2rem 1fr; gap: .9rem; align-items: start; }
.contact-list li:first-child { border-top: 1px solid var(--mortar); }
.contact-list svg { width: 22px; height: 22px; color: var(--blue); margin-top: .2rem; }
.contact-list .label { display: block; font-size: var(--step--1); color: var(--muted); }
.contact-list a, .contact-list address { font-size: var(--step-1); font-style: normal; line-height: 1.4; }
.contact-list a { text-decoration: none; }
.contact-list a:hover { text-decoration: underline; }
.contact-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 3rem; border-top: 1px solid var(--mortar); border-bottom: 1px solid var(--mortar); margin-bottom: 0; }
.contact-cols li { border: 0; padding: 1.75rem 0; align-content: start; }
.contact-cols li:first-child { border-top: 0; }
.map-link { font-size: 1rem; }
.reg-line { color: var(--muted); font-size: var(--step--1); margin-top: 1.5rem; }
@media (max-width: 760px) {
  .contact-cols { grid-template-columns: 1fr; }
  .contact-cols li + li { border-top: 1px solid var(--mortar); }
}

.form { background: var(--stone); padding: clamp(1.5rem, 4vw, 2.75rem); border-top: 3px solid var(--blue); }
.form h2 { font-size: var(--step-2); margin-bottom: .5rem; }
.form > p { color: var(--muted); }
.field { margin-bottom: 1.25rem; }
.field label { display: block; font-weight: 500; margin-bottom: .4rem; }
.field .hint { display: block; font-size: var(--step--1); color: var(--muted); margin: -.2rem 0 .45rem; }
.field input, .field select, .field textarea { width: 100%; font: inherit; color: var(--charcoal); background: #fff; border: 1.5px solid #9a9ca0; border-radius: 6px; padding: .75rem .9rem; min-height: 48px; }
.field textarea { min-height: 9rem; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: 3px solid var(--blue); outline-offset: 1px; border-color: var(--blue-deep); }
.field [aria-invalid="true"] { border-color: #b3261e; }
.field .error { color: #b3261e; font-size: var(--step--1); margin-top: .4rem; display: none; }
.field [aria-invalid="true"] + .error { display: block; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 1rem; }
@media (max-width: 560px) { .row-2 { grid-template-columns: 1fr; } }
.req { color: var(--blue-ink); }
.form-status { margin-top: 1rem; font-weight: 500; color: var(--blue-deep); }

/* ---------- Footer ---------- */
.footer { background: #26282a; color: #d9dadc; font-size: var(--step--1); }
.footer .wrap { padding-block: clamp(3rem, 6vw, 4.5rem) 2rem; }
.footer-top { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 2.5rem; padding-bottom: 2.5rem; border-bottom: 1px solid rgba(255,255,255,.14); }
.footer img { width: 170px; margin-bottom: 1.25rem; }
.footer h2 { font-size: 1rem; font-weight: 500; color: #fff; margin-bottom: .9rem; letter-spacing: 0; }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: .45rem; }
.footer a { color: #fff; text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer address { font-style: normal; line-height: 1.6; }
.footer-base { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; padding-top: 1.5rem; color: #b5b7ba; }
@media (max-width: 820px) { .footer-top { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-top { grid-template-columns: 1fr; } }