/* ==========================================================================
   The Di Salvo Engineering Group — Home
   ========================================================================== */

/* ---------- Tokens ---------- */
:root {
  --burgundy: #960000;
  --burgundy-dark: #400205;
  --slate: #374B4C;
  --sage: #95BAB2;
  --cream: #EEE8DC;
  --white: #FFFFFF;

  --rule-light: rgba(55, 75, 76, .25);
  --rule-dark: rgba(149, 186, 178, .35);

  --font-sans: 'Archivo', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --gutter: clamp(20px, 5vw, 80px);
  --header-h: 84px;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--slate);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }

a { color: inherit; text-decoration: none; }

img { display: block; max-width: 100%; }

ul, ol { list-style: none; margin: 0; padding: 0; }

h1, h2, h3, p, figure { margin: 0; }

/* Shared mono "eyebrow" type */
.section__label,
.hero__meta,
.project-card__location,
.site-footer__heading {
  font-family: var(--font-mono);
  text-transform: uppercase;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
  padding: 17px 24px;
  border-radius: 2px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .02em;
  white-space: nowrap;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.btn__arrow { font-family: var(--font-mono); }

.btn--primary { background: var(--burgundy); color: var(--white); }
.btn--primary:hover { background: var(--slate); color: var(--white); }

.btn--outline {
  padding: 16px 24px;
  border: 1px solid var(--sage);
  background: transparent;
  color: var(--white);
}
.btn--outline:hover { background: var(--cream); border-color: var(--cream); color: var(--slate); }

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  --nav-ink: var(--white);
  --nav-line: rgba(238, 232, 220, .18);
  --burger-line: rgba(255, 255, 255, .45);

  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: transparent;
  border-bottom: 1px solid var(--nav-line);
  transition: background-color .35s ease, border-color .35s ease;
}

.site-header.is-solid {
  --nav-ink: var(--slate);
  --nav-line: rgba(55, 75, 76, .18);
  --burger-line: rgba(55, 75, 76, .35);
  background: var(--cream);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--header-h);
  padding: 0 var(--gutter);
}

.site-header__left {
  display: flex;
  align-items: center;
  gap: clamp(24px, 3.5vw, 56px);
}

.site-header__brand { line-height: 0; }

.site-logo { height: 44px; width: auto; }

/* White logo over the hero; original colours once the header is solid */
.site-logo--default { display: none; }
.is-solid .site-logo--default { display: block; }
.is-solid .site-logo--on-dark { display: none; }

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-cta {
  gap: 10px;
  padding: 14px 22px;
  font-size: 14px;
}
.header-cta:hover { background: var(--burgundy-dark); }

/* ---------- Primary nav ---------- */
.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(20px, 2.4vw, 36px);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: .01em;
}

.primary-nav__item { position: relative; padding: 28px 0; }

.primary-nav__link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--nav-ink);
  transition: color .2s ease;
}
.primary-nav__link:hover { color: var(--sage); }
.is-solid .primary-nav__link:hover { color: var(--burgundy); }

.primary-nav__toggle-icon {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: .8;
}
.primary-nav__toggle-icon::before { content: "+"; }
.primary-nav__item--has-dropdown:hover .primary-nav__toggle-icon::before,
.primary-nav__item--has-dropdown:focus-within .primary-nav__toggle-icon::before { content: "−"; }

.primary-nav__dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: -20px;
  min-width: 200px;
  flex-direction: column;
  padding: 8px 0;
  background: var(--cream);
  border: 1px solid rgba(55, 75, 76, .18);
  border-top: 2px solid var(--burgundy);
}
.primary-nav__item--has-dropdown:hover .primary-nav__dropdown,
.primary-nav__item--has-dropdown:focus-within .primary-nav__dropdown { display: flex; }

.primary-nav__dropdown-link {
  display: block;
  padding: 12px 20px;
  color: var(--slate);
}
.primary-nav__dropdown-link:hover { background: var(--white); color: var(--burgundy); }

/* ---------- Menu toggle (burger) ---------- */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--burger-line);
  border-radius: 2px;
  cursor: pointer;
}

.menu-toggle__bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--nav-ink);
  transition: transform .25s ease, opacity .2s ease;
}

.menu-open .menu-toggle__bar:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.menu-open .menu-toggle__bar:nth-child(2) { opacity: 0; }
.menu-open .menu-toggle__bar:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- Mobile menu ---------- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 40;
  padding: calc(var(--header-h) + var(--dc-topbar-h, 0px) + 16px) 20px 32px;
  background: var(--cream);
  overflow-y: auto;
}
.mobile-menu[hidden] { display: none; }

.mobile-menu__link {
  display: block;
  padding: 16px 0;
  border-bottom: 1px solid rgba(55, 75, 76, .2);
  color: var(--slate);
  font-size: 22px;
}
.mobile-menu__link--sub { font-size: 17px; padding-left: 16px; }

/* Company dropdown inside the mobile menu */
.mobile-menu__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  border-width: 0 0 1px;
  border-style: solid;
  border-color: rgba(55, 75, 76, .2);
  background: none;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
}

.mobile-menu__caret {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--burgundy);
}
.mobile-menu__caret::before { content: "+"; }
.mobile-menu__toggle[aria-expanded="true"] .mobile-menu__caret::before { content: "−"; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  overflow: hidden;
  background: #000;
}

/* Slow pan/zoom to give the banner photo some movement */
@keyframes hero-pan-zoom {
  0%   { transform: scale(1.04) translate(0, 0); }
  100% { transform: scale(1.18) translate(-2.5%, -1.5%); }
}

.hero__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform-origin: 60% 40%;
  will-change: transform;
  animation: hero-pan-zoom 26s ease-in-out infinite alternate;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, .62) 0%, rgba(0, 0, 0, .52) 40%, rgba(0, 0, 0, .78) 100%);
}

.hero__grid-lines {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 0 var(--gutter);
  pointer-events: none;
}
.hero__grid-line { border-left: 1px solid rgba(238, 232, 220, .1); }
.hero__grid-line:last-child { border-right: 1px solid rgba(238, 232, 220, .1); }

.hero__container {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: max(100vh, 620px);
  min-height: max(100svh, 620px);
  padding: calc(var(--header-h) + var(--dc-topbar-h, 0px) + 48px) var(--gutter) clamp(72px, 10vh, 112px);
}

.hero__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(20px, 2.4vw, 32px);
  max-width: 1120px;
}

.hero__title {
  font-weight: 400;
  font-size: clamp(40px, 6vw, 86px);
  line-height: 1.02;
  letter-spacing: -.03em;
  color: var(--white);
  text-wrap: balance;
}
.hero__highlight { color: var(--sage); }

.hero__lede {
  max-width: 560px;
  font-size: clamp(17px, 1.4vw, 20px);
  font-weight: 300;
  line-height: 1.5;
  color: var(--cream);
  text-wrap: pretty;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px;
  margin-top: 8px;
}

.hero__cta-primary { padding: 18px 26px; }
.hero__cta-primary:hover { background: var(--white); color: var(--burgundy); }

.hero__cta-secondary {
  padding: 6px 0;
  border-bottom: 1px solid var(--sage);
  color: var(--white);
  font-size: 15px;
  font-weight: 500;
  transition: color .2s ease;
}
.hero__cta-secondary:hover { color: var(--sage); }

.hero__meta {
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 24px;
  display: flex;
  justify-content: flex-end;
  gap: 32px;
  font-size: 11px;
  letter-spacing: .14em;
  color: rgba(238, 232, 220, .7);
}

/* ==========================================================================
   Sections (shared)
   ========================================================================== */
.section {
  --rule: var(--rule-light);
  --accent: var(--burgundy);
  --title-ink: var(--slate);

  padding: clamp(80px, 11vw, 100px) var(--gutter);
}

.section--dark {
  --rule: var(--rule-dark);
  --accent: var(--sage);
  --title-ink: var(--white);

  background: var(--slate);
  color: var(--cream);
}

.section__header {
  display: flex;
  flex-wrap: wrap;
  gap: 32px clamp(32px, 5vw, 80px);
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}

.section__label {
  flex: 1 1 220px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .12em;
  color: var(--accent);
}

.section__intro {
  flex: 3 1 560px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 40px;
}

.section__title {
  font-weight: 400;
  font-size: clamp(32px, 3.8vw, 56px);
  line-height: 1.08;
  letter-spacing: -.025em;
  color: var(--title-ink);
  text-wrap: balance;
}
.section__highlight { color: var(--accent); }

/* ---------- Framed media (corner brackets) ---------- */
.framed-media {
  --corner: 28px;

  position: relative;
  padding: clamp(10px, 1.2vw, 16px);
  border: 1px solid var(--rule);
}

.framed-media__corner {
  position: absolute;
  width: var(--corner);
  height: var(--corner);
  border: 0 solid var(--accent);
}
.framed-media__corner--tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; }
.framed-media__corner--tr { top: -1px; right: -1px; border-top-width: 2px; border-right-width: 2px; }
.framed-media__corner--bl { bottom: -1px; left: -1px; border-bottom-width: 2px; border-left-width: 2px; }
.framed-media__corner--br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; }

.framed-media__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   01 What We Do
   ========================================================================== */
.services__figure { margin-top: clamp(56px, 7vw, 104px); }

.services__media .framed-media__frame {
  aspect-ratio: 16 / 7.5;
  min-height: 260px;
}

/* ---------- Photo slider ---------- */
.services-slider {
  position: relative;
  overflow: hidden;
}

.services-slider__track {
  display: flex;
  height: 100%;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}
.services-slider__track::-webkit-scrollbar { display: none; }
.services-slider__track:focus-visible { outline: 2px solid var(--burgundy); outline-offset: -2px; }

.services-slider__slide {
  flex: 0 0 100%;
  height: 100%;
  scroll-snap-align: start;
}

.services-slider__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Arrows sit over the bottom-right corner of the photo */
.services-slider__nav {
  position: absolute;
  right: 20px;
  bottom: 20px;
  display: flex;
  gap: 8px;
}

.services-slider__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--cream);
  border-radius: 2px;
  background: var(--cream);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 16px;
  cursor: pointer;
  transition: background-color .2s ease, border-color .2s ease, color .2s ease;
}
.services-slider__btn:hover { background: var(--burgundy); border-color: var(--burgundy); color: var(--white); }
.services-slider__btn:focus-visible { outline: 2px solid var(--white); outline-offset: 2px; }

/* ==========================================================================
   02 Company
   ========================================================================== */
.company__body {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 48px clamp(32px, 5vw, 80px);
  margin-top: clamp(56px, 7vw, 104px);
}

.company__content {
  flex: 1 1 400px;
  display: flex;
  flex-direction: column;
  gap: clamp(32px, 3.5vw, 48px);
}

.company__intro {
  max-width: 560px;
  font-size: clamp(17px, 1.4vw, 20px);
  font-weight: 300;
  line-height: 1.55;
  text-wrap: pretty;
}

.company-timeline { border-bottom: 1px solid var(--rule); }

.company-timeline__item {
  display: grid;
  grid-template-columns: minmax(120px, 160px) 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}

.company-timeline__period {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sage);
}

.company-timeline__title { font-size: 17px; line-height: 1.4; }

.company__media {
  --corner: 24px;
  flex: 1 1 420px;
}
.company__media .framed-media__frame { aspect-ratio: 5 / 4; }

/* ==========================================================================
   03 Selected Experience
   ========================================================================== */
.projects__header {
  align-items: flex-end;
  justify-content: space-between;
}
.projects__header .section__label { flex: 0 1 auto; }

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 48px clamp(20px, 2.4vw, 36px);
  margin-top: 48px;
}

/* Staggered second column */
.project-card:nth-child(even) { margin-top: 120px; }

.project-card__link {
  display: flex;
  flex-direction: column;
  gap: 20px;
  color: var(--slate);
}

.project-card__rule { border-bottom: 1px solid var(--rule-light); }

.project-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--white);
}

.project-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .9s cubic-bezier(.2, .7, .2, 1);
}
.project-card__link:hover .project-card__image { transform: scale(1.06); }

.project-card__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.project-card__title {
  align-self: flex-start;
  padding-bottom: 6px;
  font-weight: 400;
  font-size: clamp(24px, 2.1vw, 32px);
  line-height: 1.15;
  letter-spacing: -.015em;
  background: linear-gradient(var(--burgundy), var(--burgundy)) no-repeat 0 100% / 0% 2px;
  transition: background-size .45s ease;
}
.project-card__link:hover .project-card__title { background-size: 100% 2px; }

.project-card__location {
  font-size: 12px;
  letter-spacing: .1em;
  opacity: .85;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  padding: clamp(72px, 8vw, 80px) var(--gutter) 32px;
  background: var(--slate);
  color: var(--cream);
}

.site-footer__top {
  padding-bottom: 48px;
  border-bottom: 1px solid var(--rule-dark);
}

.site-footer__logo { height: clamp(52px, 5vw, 72px); width: auto; }

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 48px 40px;
  padding: clamp(40px, 5vw, 64px) 0;
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
}

.site-footer__heading {
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .14em;
  color: var(--sage);
}

.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 16px;
}

.footer-nav__link,
.footer-social__link,
.footer-office__phone,
.site-footer__back-to-top { transition: color .2s ease; }

.footer-nav__link:hover,
.footer-social__link:hover,
.footer-office__phone:hover,
.site-footer__back-to-top:hover { color: var(--sage); }

.footer-office__address {
  font-style: normal;
  font-size: 16px;
  line-height: 1.6;
}

.footer-office__phone {
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(149, 186, 178, .5);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 14px;
}

.footer-social__link { font-size: 16px; }

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--rule-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
}

.site-footer__copyright { font-size: inherit; }

/* ==========================================================================
   Back to Home
   ========================================================================== */
.back-home {
  position: fixed;
  left: 20px;
  bottom: 20px;
  z-index: 1000;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 999px;
  background: var(--slate);
  color: var(--white);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .25);
  transition: background-color .2s ease, transform .2s ease;
}
.menu-open .back-home { display: none; }
.back-home:hover { background: var(--burgundy); color: var(--white); transform: translateY(-2px); }
.back-home:focus-visible { outline: 2px solid var(--sage); outline-offset: 3px; }

/* ==========================================================================
   Responsive
   ========================================================================== */

/* Large tablet / small laptop */
@media (max-width: 1099px) {
  .project-card:nth-child(even) { margin-top: 64px; }
}

/* Tablet: swap the inline nav for the burger menu */
@media (max-width: 959px) {
  .primary-nav { display: none; }
  .menu-toggle { display: flex; }
}

/* Mobile */
@media (max-width: 639px) {
  :root { --header-h: 68px; }

  .back-home { left: 12px; bottom: 12px; padding: 12px 14px; }
  .back-home__label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
  }

  .site-header__inner { gap: 12px; }
  .site-logo { height: 34px; }
  .header-cta { padding: 12px 16px; }

  .hero__container {
    min-height: max(100vh, 560px);
    min-height: max(100svh, 560px);
    padding-bottom: 64px;
  }
  .hero__title { font-size: clamp(32px, 10vw, 44px); }
  .hero__actions { gap: 20px 24px; }
  .hero__meta { font-size: 10px; }
  .hero__scroll-cue { display: none; }

  .section { padding-top: 64px; padding-bottom: 64px; }
  .section__header { gap: 24px; }
  .section__intro { gap: 28px; }

  .services__figure,
  .company__body { margin-top: 40px; }
  .services__media .framed-media__frame { aspect-ratio: 4 / 3; min-height: 0; }
  .services-slider__nav { right: 12px; bottom: 12px; gap: 6px; }
  .services-slider__btn { width: 40px; height: 40px; }

  .company__body { gap: 40px; }
  .company-timeline__item { grid-template-columns: 104px 1fr; gap: 12px; padding: 16px 0; }
  .company-timeline__title { font-size: 16px; }

  .projects__header { align-items: flex-start; flex-direction: column; gap: 24px; }

  .project-grid { grid-template-columns: minmax(0, 1fr); gap: 48px; margin-top: 40px; }
  .project-card:nth-child(even) { margin-top: 0; }

  .site-footer__top { padding-bottom: 40px; }
  .site-footer__columns { gap: 40px; }
}

/* Very small phones: keep logo, CTA and burger on one line */
@media (max-width: 379px) {
  .header-cta { padding: 12px 14px; }
  .header-cta .btn__arrow { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .hero__image { animation: none; transform: scale(1.04); }
}