/* Shared site header — canonical runtime shell for all pages.
 * The case-study header geometry is the global baseline so page-scoped
 * redesign CSS cannot silently fork the site shell.
 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(26,49,75,.16);
  background: rgba(255,255,255,.97);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.site-header .wrap {
  display: flex;
  width: min(calc(100% - 48px), 1240px);
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 0;
  align-items: center;
  justify-content: flex-start;
  gap: 32px;
  height: 76px;
}

.site-header .logo {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  cursor: pointer;
}

.site-header .logo img {
  width: auto;
  height: 28px;
}

.site-header .main-nav {
  display: flex;
  flex: 1;
  min-width: 0;
  align-items: center;
  justify-content: flex-end;
}

.site-header .main-nav ul {
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header .main-nav a {
  position: static;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  color: var(--ob-color-heading);
  font-size: 13.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: border-color .2s, color .2s;
}

.site-header .main-nav a::after {
  content: none;
  display: none;
}

.site-header .main-nav a:hover {
  border-bottom-color: var(--ob-color-action);
  color: var(--ob-color-action);
}
.site-header .main-nav a.active {
  border-bottom-color: var(--ob-color-accent);
  color: var(--ob-color-heading);
}

.site-header .nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border: 0;
  background: none;
  cursor: pointer;
}

.site-header .nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ob-color-heading);
}

.header-contact {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-left: 0;
  padding: 0 20px;
  border: 1px solid var(--ob-color-heading);
  border-radius: var(--ob-shell-control-radius);
  background: var(--ob-color-heading);
  color: #fff;
  font-size: 13.5px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
  transition: background-color .18s ease, border-color .18s ease;
}

.header-contact:hover {
  border-color: var(--ob-color-dark);
  background: var(--ob-color-dark);
  color: #fff;
}

.header-contact:focus-visible,
.site-header .nav-toggle:focus-visible,
.site-header .main-nav a:focus-visible {
  outline: 3px solid var(--ob-color-heading);
  outline-offset: 3px;
}

/* HOME carries a 1440px content wrapper below the shell. The shared header
 * explicitly owns a 1240px symmetric content line so the logo aligns with the
 * HERO reading edge and the contact CTA mirrors it on the right. */
body.home-v2 .site-header {
  border-color: rgba(26,49,75,.16);
  background: rgba(255,255,255,.97);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
body.home-v2 .site-header .wrap {
  width: min(calc(100% - 48px), 1240px);
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: 0;
  justify-content: flex-start;
  gap: 32px;
  height: 76px;
}
body.home-v2 .site-header .logo img { height: 28px; }
body.home-v2 .site-header .main-nav {
  justify-content: flex-end;
}
body.home-v2 .site-header .main-nav ul { gap: 24px; }
body.home-v2 .site-header .main-nav a {
  position: static;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  color: var(--ob-color-heading);
  font-size: 13.5px;
  font-weight: 500;
}
body.home-v2 .site-header .main-nav a::after { content:none; display:none; }
body.home-v2 .site-header .main-nav a:hover {
  border-bottom-color: var(--ob-color-action);
  color: var(--ob-color-action);
}
body.home-v2 .site-header .main-nav a.active {
  border-bottom-color: var(--ob-color-accent);
  color: var(--ob-color-heading);
}

@media (max-width: 1180px) {
  .site-header .wrap,
  body.home-v2 .site-header .wrap {
    width: 100%;
    max-width: none;
    padding-inline: 24px;
    justify-content: flex-start;
    gap: 16px;
    height: 76px;
  }

  .site-header .main-nav,
  body.home-v2 .site-header .main-nav {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    max-height: 80vh;
    padding: 20px 24px 28px;
    overflow-y: auto;
    border-bottom: 1px solid rgba(26,49,75,.16);
    background: #fff;
    box-shadow: var(--shadow-card);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity .2s, transform .2s;
  }

  .site-header .main-nav.open,
  body.home-v2 .site-header .main-nav.open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .site-header .main-nav ul,
  body.home-v2 .site-header .main-nav ul {
    width: 100%;
    flex-direction: column;
    gap: 4px;
  }

  .site-header .main-nav a,
  body.home-v2 .site-header .main-nav a {
    display: block;
    width: 100%;
    padding: 12px 4px;
    border-bottom: 1px solid rgba(26,49,75,.16);
  }

  .site-header .nav-toggle,
  body.home-v2 .site-header .nav-toggle {
    display: flex;
    flex: 0 0 auto;
  }

  body.home-v2 .site-header .nav-toggle {
    min-width: 0;
    min-height: 0;
    align-items: stretch;
    justify-content: flex-start;
  }

  body.home-v2 .site-header .nav-toggle span { background: var(--ob-color-heading); }

  .header-contact {
    margin-left: auto;
    padding-inline: 16px;
    font-size: 13px;
  }
}

@media (max-width: 420px) {
  .site-header .wrap,
  body.home-v2 .site-header .wrap {
    gap: 10px;
    padding-inline: 16px;
  }

  .site-header .logo img,
  body.home-v2 .site-header .logo img {
    height: 24px;
  }

  .header-contact {
    padding-inline: 12px;
    font-size: 12px;
  }

  .site-header .nav-toggle {
    padding-inline: 3px;
  }
}

/* 320px-class viewports need an explicit capacity mode: preserve all three actions
   (brand / contact / menu) rather than allowing the shell to create page overflow. */
@media (max-width: 360px) {
  .site-header .wrap,
  body.home-v2 .site-header .wrap {
    gap: 7px;
    padding-inline: 10px;
  }

  .site-header .logo img,
  body.home-v2 .site-header .logo img {
    height: 20px;
  }

  .header-contact {
    padding-inline: 8px;
    font-size: 11px;
  }

  .site-header .nav-toggle {
    padding-inline: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header .main-nav,
  .header-contact {
    transition: none;
  }
}

@media (forced-colors: active) {
  .site-header,
  .site-header .main-nav {
    background: Canvas;
    color: CanvasText;
  }

  .header-contact {
    border: 1px solid ButtonText;
    background: ButtonFace;
    color: ButtonText;
  }
}