/* Shared site chrome used by the Case Studies, About, and AI guide pages. */
:root {
  --chrome-ink: var(--text, #f4f1f6);
  --chrome-muted: var(--muted, #bbb7c4);
  --chrome-accent: var(--accent, #ed1e40);
  --chrome-night: var(--bg, #0f0e16);
  --chrome-surface: var(--surface, #1a1822);
  --chrome-panel: #17151f;
  --chrome-panel-surface: #24212c;
  --chrome-line: var(--line, rgba(244, 241, 246, 0.1));
  --chrome-shadow: 0 1.5rem 3.75rem rgba(0, 0, 0, 0.48);
  --chrome-header-height: 72px;
  --chrome-gutter: clamp(1.25rem, 4vw, 4rem);
  --chrome-ease: cubic-bezier(0.16, 1, 0.3, 1);
}

html { background: var(--chrome-night); }
body { min-width: 20rem; min-height: 100svh; overflow-x: hidden; }
body.menu-open, body.settings-open { overflow: hidden; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: var(--chrome-header-height);
  min-height: 0;
  padding: env(safe-area-inset-top) max(var(--chrome-gutter), env(safe-area-inset-right)) 0 max(var(--chrome-gutter), env(safe-area-inset-left));
  background: transparent;
  -webkit-backdrop-filter: blur(1.25rem) saturate(1.12);
  backdrop-filter: blur(1.25rem) saturate(1.12);
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  transition: transform 420ms cubic-bezier(0.22, 1, 0.36, 1), background-color 220ms ease;
  will-change: transform;
}

.site-header.is-hidden { transform: translate3d(0, calc(-100% - env(safe-area-inset-top)), 0); }

.brand {
  display: grid;
  grid-column: 2;
  width: 3.25rem;
  min-height: 2.75rem;
  justify-self: center;
  place-items: center;
}
.brand-mark { position: relative; display: block; width: 100%; pointer-events: none; }
.brand-logo {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 4;
  background: var(--chrome-accent);
  -webkit-mask: url("adam-yale-logo-light.png") center / contain no-repeat;
  mask: url("adam-yale-logo-light.png") center / contain no-repeat;
  transition: background-color 220ms ease;
}
.brand::after { content: none; display: none; }

.header-actions { display: flex; grid-column: 3; align-items: center; justify-self: end; gap: clamp(1rem, 2vw, 2rem); }
.desktop-nav { display: none; align-items: center; gap: clamp(1.5rem, 2.75vw, 3rem); }
.desktop-nav a, .mobile-nav a {
  color: var(--chrome-accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  text-decoration: none;
  text-transform: uppercase;
  transition: color 140ms linear;
}
.desktop-nav a { display: inline-flex; min-height: 2.75rem; align-items: center; }
.desktop-nav a:hover, .desktop-nav a:focus-visible, .mobile-nav a:hover, .mobile-nav a:focus-visible { color: var(--chrome-ink); }
.desktop-nav a[aria-current="page"], .mobile-nav a[aria-current="page"] { color: var(--chrome-ink); }

.menu-button {
  position: relative;
  z-index: 30;
  display: grid;
  grid-column: 1;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  justify-self: start;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--chrome-accent);
  cursor: pointer;
}
.menu-icon, .menu-icon::before, .menu-icon::after { display: block; width: 1.5rem; height: 0.125rem; background: currentColor; content: ""; transition: transform 260ms var(--chrome-ease), opacity 160ms linear; }
.menu-icon { position: relative; }
.menu-icon::before, .menu-icon::after { position: absolute; left: 0; }
.menu-icon::before { transform: translateY(-0.45rem); }
.menu-icon::after { transform: translateY(0.45rem); }
.menu-open .menu-icon { background: transparent; }
.menu-open .menu-icon::before { transform: rotate(45deg); }
.menu-open .menu-icon::after { transform: rotate(-45deg); }

.mobile-nav { position: fixed; z-index: 10; inset: var(--chrome-header-height) 0 0; display: grid; padding: 2rem var(--chrome-gutter) max(2rem, env(safe-area-inset-bottom)); place-items: center; background: var(--chrome-night); opacity: 0; pointer-events: none; transform: translateY(-1rem); transition: opacity 220ms linear, transform 360ms var(--chrome-ease); }
.menu-open .mobile-nav { opacity: 1; pointer-events: auto; transform: translateY(0); }
.mobile-nav ul { display: grid; width: min(100%, 24rem); gap: 0; padding: 0; margin: 0; list-style: none; text-align: left; }
.mobile-nav li + li { border-top: 1px solid var(--chrome-line); }
.mobile-nav a { display: grid; min-height: 4.75rem; place-items: center; font-size: 1rem; }

.about-footer { padding: 0 var(--chrome-gutter) 2rem; }
.about-footer-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2rem; width: min(100%, 72rem); margin-inline: auto; padding-top: clamp(3rem, 6vw, 5rem); border-top: 1px solid var(--chrome-line); }
.footer-heading { margin: 0 0 1rem; color: var(--chrome-accent); font-size: .7rem; font-weight: 700; letter-spacing: .12em; }
.footer-links { display: grid; gap: .75rem; padding: 0; margin: 0; list-style: none; color: var(--chrome-muted); font-size: .875rem; font-weight: 300; }
.about-footer a { color: var(--chrome-ink); text-decoration: none; transition: color 220ms var(--chrome-ease); }
.about-footer a:hover, .about-footer a:focus-visible { color: var(--chrome-accent); }
.about-copyright { display: flex; width: min(100%, 72rem); margin: 4rem auto 0; padding-top: 1.5rem; align-items: center; justify-content: space-between; border-top: 1px solid var(--chrome-line); color: var(--chrome-muted); font-size: .75rem; }
.about-copyright .brand-logo { width: 2.125rem; }

.menu-button:focus-visible, .brand:focus-visible, .desktop-nav a:focus-visible, .mobile-nav a:focus-visible { outline: 2px solid var(--chrome-ink); outline-offset: .25rem; }

@media (min-width: 48rem) {
  .site-header { display: flex; }
  .brand { grid-column: auto; justify-self: auto; }
  .header-actions { grid-column: auto; margin-left: auto; }
  .desktop-nav { display: flex; }
  .menu-button, .mobile-nav { display: none; }
}

@media (max-width: 63.999rem) {
  .about-footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 30rem) {
  :root { --chrome-header-height: 72px; }
  .brand { width: 2.75rem; }
  .about-footer-grid { grid-template-columns: minmax(0, 1fr); }
  .about-copyright { align-items: flex-start; flex-direction: column; gap: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header, .about-footer a, .menu-icon, .menu-icon::before, .menu-icon::after, .mobile-nav, .sound-toggle::after { transition-duration: .01ms; }
}