/* MAC Engineering — macengllc.com. Navy masthead, white body; one column on phones. */
:root {
  --navy: #12305B;
  --ink: #0F1B2D;
  --body: #3A4452;
  --muted: #555F6B;
  --num: #7D8693;
  --line: #D5DAE1;
  --alt: #F4F6F9;
  --on-navy: #DCE2EB;
  --on-navy-muted: #C3CCD9;
  --rule-on-navy: rgba(255, 255, 255, 0.24);
  --display: "Saira", "Arial Narrow", "Helvetica Neue", sans-serif;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --gutter: clamp(16px, 4vw, 32px);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: #fff; color: var(--ink); font: 400 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { font-family: var(--display); margin: 0; text-wrap: balance; }
p { margin: 0; }
a { color: var(--navy); text-underline-offset: 4px; }
:focus-visible { outline: 2px solid #4C9BE8; outline-offset: 3px; }
[id] { scroll-margin-top: 16px; }

.wrap { max-width: 1200px; margin: 0 auto; padding-inline: var(--gutter); }
.skip { position: absolute; left: 16px; top: -48px; background: #fff; color: var(--navy); padding: 10px 14px; z-index: 10; font-weight: 600; }
.skip:focus { top: 12px; }

.kicker { font: 500 12px/1.6 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.kicker-light { color: var(--on-navy-muted); }
.muted { color: var(--muted); }

.btn { display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 22px; border-radius: 2px; font-weight: 600; font-size: 16px; text-decoration: none; }
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { background: #E6ECF4; }
.link-light { display: inline-flex; align-items: center; min-height: 48px; color: #fff; font-weight: 600; }
.link-light:hover { color: var(--on-navy); }

/* Header */
.site-header { background: var(--navy); color: #fff; border-bottom: 1px solid rgba(255, 255, 255, 0.14); position: relative; }
.header-row { display: flex; align-items: center; justify-content: space-between; gap: 8px 32px; padding-block: 14px; }
.brand { display: flex; align-items: center; min-height: 44px; }
.brand img { height: 40px; width: auto; }
.nav { display: flex; align-items: center; gap: 0 24px; font-size: 15px; font-weight: 500; }
.nav a, .mobile-nav a { color: #fff; text-decoration: none; display: inline-flex; align-items: center; min-height: 44px; }
.nav a:hover { color: var(--on-navy); text-decoration: underline; }
.nav .nav-cta { padding: 0 16px; border: 1px solid rgba(255, 255, 255, 0.7); border-radius: 2px; font-weight: 600; }
.nav .nav-cta:hover { background: rgba(255, 255, 255, 0.1); text-decoration: none; }

.menu-btn { display: none; align-items: center; gap: 8px; min-height: 44px; padding: 0 14px; background: transparent; color: #fff; border: 1px solid rgba(255, 255, 255, 0.7); border-radius: 2px; font: 600 15px/1 var(--sans); cursor: pointer; }
.menu-btn[aria-expanded="true"] { background: rgba(255, 255, 255, 0.12); }
.mobile-nav { position: absolute; left: 0; right: 0; top: 100%; z-index: 5; background: var(--navy); border-top: 1px solid var(--rule-on-navy); box-shadow: 0 12px 24px rgba(15, 27, 45, 0.25); padding: 8px var(--gutter) 16px; display: flex; flex-direction: column; }
.mobile-nav[hidden] { display: none; }
.mobile-nav a { min-height: 48px; border-bottom: 1px solid rgba(255, 255, 255, 0.12); font-size: 17px; }

/* Hero */
.hero { background: var(--navy); color: #fff; }
.hero-row { display: flex; flex-wrap: wrap; align-items: center; gap: 40px 64px; padding-block: clamp(40px, 7vw, 96px) clamp(88px, 10vw, 136px); }
.hero-copy { flex: 1 1 520px; min-width: 0; display: flex; flex-direction: column; gap: 24px; }
.hero h1 { font-weight: 700; font-size: clamp(40px, 6vw, 76px); line-height: 1.02; letter-spacing: -0.015em; max-width: 16ch; }
.lede { font-size: clamp(17px, 1.6vw, 20px); line-height: 1.55; color: var(--on-navy); max-width: 52ch; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px; padding-top: 8px; }
.hero-photo { flex: 1 1 420px; min-width: 0; margin: 0; aspect-ratio: 4 / 3; border: 1px solid rgba(255, 255, 255, 0.2); background: rgba(255, 255, 255, 0.06); overflow: hidden; }
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }

/* Credentials strip, overlapping the masthead */
.creds-wrap { margin-top: -56px; position: relative; }
.creds { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.creds li { flex: 1 1 240px; background: #fff; padding: 24px; display: flex; flex-direction: column; gap: 6px; }
.creds strong { font: 600 22px/1.25 var(--display); color: var(--navy); }
.creds span { font-size: 14px; line-height: 1.5; color: var(--muted); }

/* Sections */
.section { padding-block: clamp(56px, 8vw, 96px); }
#services { padding-top: clamp(64px, 9vw, 112px); }
.section-navy { background: var(--navy); color: #fff; }
.section-alt { background: var(--alt); border-block: 1px solid var(--line); }
.section h2 { font-weight: 700; font-size: clamp(30px, 3.6vw, 44px); line-height: 1.1; color: var(--navy); margin-top: 14px; }
.section-navy h2 { color: #fff; }
.stack { display: flex; flex-direction: column; gap: 36px; }
.section-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px 48px; }
.intro { font-size: 17px; line-height: 1.6; color: var(--body); max-width: 50ch; }
.section-navy .intro { color: var(--on-navy); }
.split { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 32px 64px; }
.split-intro { flex: 1 1 300px; min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.split-intro h2 { margin-top: 0; }
.split-intro .intro { max-width: 40ch; }

/* Services */
.services { flex: 2 1 560px; min-width: 0; list-style: none; margin: 0; padding: 0; border-top: 2px solid var(--navy); }
.services li { display: flex; flex-wrap: wrap; gap: 8px 28px; padding: 28px 0; border-bottom: 1px solid var(--line); }
.services .num { flex: 0 0 56px; font: 600 40px/1 var(--display); color: var(--num); }
.services li > div { flex: 1 1 360px; min-width: 0; display: flex; flex-direction: column; gap: 10px; }
.services h3 { font-weight: 600; font-size: 24px; line-height: 1.2; }
.services p { color: var(--body); }
.services .deliverables { font-size: 14px; color: var(--muted); }

/* Control systems */
.tiles { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1px; background: rgba(255, 255, 255, 0.2); border: 1px solid rgba(255, 255, 255, 0.2); }
.tiles li { flex: 1 1 260px; min-width: 0; background: var(--navy); padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.tiles span { font: 500 11px/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--on-navy-muted); }
.tiles strong { font: 600 22px/1.3 var(--display); }
.fineprint { font-size: 13px; line-height: 1.6; color: var(--on-navy-muted); }

/* Process */
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 32px; }
.steps li { flex: 1 1 240px; min-width: 0; border-top: 3px solid var(--navy); padding-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.step-num { font: 500 13px/1 var(--mono); color: var(--navy); }
.steps h3 { font-weight: 600; font-size: 20px; }
.steps p { font-size: 15.5px; color: var(--body); }

/* About */
.about { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 40px 64px; }
.portrait { flex: 0 1 320px; min-width: 0; margin: 0; display: flex; flex-direction: column; gap: 14px; }
.portrait img { aspect-ratio: 3 / 4; width: 100%; object-fit: cover; background: #E3E8EF; border: 1px solid var(--line); }
.portrait figcaption { display: flex; flex-direction: column; gap: 2px; }
.portrait strong { font: 600 20px/1.3 var(--display); color: var(--navy); }
.portrait span { font-size: 15px; color: var(--muted); }
.about-copy { flex: 1 1 480px; min-width: 0; display: flex; flex-direction: column; gap: 18px; }
.about-copy h2 { margin-top: 0; max-width: 20ch; }
.about-copy p { max-width: 62ch; font-size: 17px; line-height: 1.65; color: var(--body); }
.about-copy .about-lead { font-size: 18px; color: var(--ink); }
.about-copy .muted { font-size: 15px; color: var(--muted); }

/* Contact */
.contact-title { margin-top: 0; font-size: clamp(30px, 4vw, 52px); line-height: 1.05; max-width: 18ch; }
.section-head .contact-title + .intro { margin-top: 14px; }
.contact-list { margin: 0; display: flex; flex-wrap: wrap; gap: 24px 32px; border-top: 1px solid rgba(255, 255, 255, 0.28); padding-top: 28px; }
.contact-list div { flex: 1 1 220px; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
.contact-list dt { font: 500 11px/1.4 var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--on-navy-muted); }
.contact-list dd { margin: 0; font-size: 18px; font-weight: 500; overflow-wrap: anywhere; }
.contact-list a { color: #fff; }

/* Footer */
.site-footer { background: var(--navy); border-top: 1px solid rgba(255, 255, 255, 0.14); color: var(--on-navy-muted); }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px 32px; padding-block: 28px; }
.footer-row img { height: 28px; width: auto; }
.footer-row p { font-size: 14px; }

/* Phones and small tablets: the inline nav becomes a menu */
@media (max-width: 860px) {
  .nav { display: none; }
  .menu-btn { display: inline-flex; }
}
@media (min-width: 861px) {
  .mobile-nav { display: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}