/* ==========================================================================
   Barzin Mobasher Research Group — ASU Unity Design System look
   Colors, type, and components follow ASU web standards:
   maroon #8C1D40, gold #FFC627, Arial, pill buttons, square cards,
   gold-highlight headings, standard ASU global footer.
   ========================================================================== */

:root {
  --maroon: #8C1D40;
  --maroon-dark: #6f1734;
  --gold: #FFC627;
  --dark: #191919;
  --gray-7: #484848;
  --gray-5: #6d6d6d;
  --gray-4: #bfbfbf;
  --gray-3: #d0d0d0;
  --gray-2: #e8e8e8;
  --gray-1: #fafafa;
  --white: #ffffff;
  --max-w: 1200px;
  --shadow-1: 0 2px 8px rgba(25, 25, 25, .12);
  --shadow-2: 0 8px 24px rgba(25, 25, 25, .18);
}

* { box-sizing: border-box; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
[id] { scroll-margin-top: 9rem; }

body {
  margin: 0;
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--dark);
  background: var(--white);
}

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

a { color: var(--maroon); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--maroon-dark); }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--dark);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--gold);
}
.band-dark :focus-visible, .band-maroon :focus-visible, .hero-dark :focus-visible, .footer-social :focus-visible {
  outline-color: var(--white);
}

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 .6em;
  color: var(--dark);
}
h1 { font-size: clamp(2.4rem, 5.5vw, 4rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.05rem; }

p { margin: 0 0 1em; }
.lead { font-size: 1.2rem; line-height: 1.55; color: var(--gray-7); }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.25rem; }

section { padding: 3.5rem 0; }
section.tight { padding: 2.25rem 0; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--gold); color: var(--dark); font-weight: 700;
  padding: .6rem 1rem; text-decoration: none;
}
.skip-link:focus { left: 0; }


/* --- Prototype ribbon ---------------------------------------------------- */
.proto-ribbon {
  background: var(--gold);
  color: var(--dark);
  font-size: .85rem;
  font-weight: 700;
  text-align: center;
  padding: .45rem 1rem;
}
.proto-ribbon button {
  background: none; border: 0; font: inherit; cursor: pointer;
  margin-left: .75rem; text-decoration: underline;
}


/* --- Header -------------------------------------------------------------- */
.asu-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-3);
  position: sticky;
  top: 0;
  z-index: 100;
}
.asu-header .brand-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: .8rem 0 .55rem;
}
.asu-header .brand-row img.asu-logo { height: 52px; width: auto; }
.asu-header .brand-row .search-toggle {
  background: none; border: 0; cursor: pointer; padding: .4rem;
  color: var(--dark);
}
.title-row {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap; padding-bottom: 0;
}
.site-title {
  font-weight: 700; font-size: 1.05rem; color: var(--dark);
  text-decoration: none; padding: .35rem 0 .8rem;
}
.site-title:hover { color: var(--maroon); }

.main-nav { display: flex; gap: .25rem; flex-wrap: wrap; align-items: stretch; }


/* --- Dropdown navigation ---------------------------------------------------- */
.nav-item.has-sub { position: relative; display: flex; align-items: stretch; }
.nav-item.has-sub > a { padding-right: .3rem; }
.sub-toggle {
  background: none; border: 0; cursor: pointer; color: var(--dark);
  padding: .55rem .55rem .55rem .1rem; font-size: .8rem; line-height: 1;
  border-bottom: 8px solid transparent;
}
.sub-toggle:hover { background: var(--gray-1); }
.sub-menu {
  display: none; position: absolute; top: 100%; left: 0; z-index: 120;
  min-width: 15rem; background: var(--white);
  border: 1px solid var(--gray-3); border-top: 4px solid var(--maroon);
  box-shadow: var(--shadow-2); padding: .35rem 0;
}
.nav-item.has-sub.open .sub-menu { display: block; }
.sub-menu a {
  display: block; padding: .5rem 1rem; font-size: .92rem; font-weight: 400;
  border-bottom: 0; text-decoration: none; color: var(--dark);
}
.sub-menu a:hover { background: var(--gray-1); color: var(--maroon); }
@media (min-width: 901px) {
  .nav-item.has-sub:hover .sub-menu,
  .nav-item.has-sub:focus-within .sub-menu { display: block; }
}
@media (max-width: 900px) {
  .nav-item.has-sub { flex-wrap: wrap; }
  .nav-item.has-sub > a { flex: 1; }
  .sub-menu { position: static; width: 100%; box-shadow: none; border: 0; border-left: 8px solid var(--gray-2); padding: 0 0 .3rem; }
  .sub-menu a { padding-left: 1.6rem; }
  .sub-toggle { border-bottom: 0; border-left: 0; padding: .55rem .9rem; }
}
.main-nav a {
  display: block;
  padding: .55rem .8rem;
  font-weight: 700;
  font-size: .95rem;
  color: var(--dark);
  text-decoration: none;
  border-bottom: 8px solid transparent;
}
.main-nav a:hover { background: var(--gray-1); border-bottom-color: var(--gray-3); }
.main-nav a.active { border-bottom-color: var(--gold); }

.nav-toggle {
  display: none;
  background: var(--white); border: 1px solid var(--gray-3);
  font-weight: 700; font-size: .95rem; padding: .5rem .9rem; cursor: pointer;
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-block; margin-bottom: .8rem; }
  .main-nav {
    display: none; width: 100%; flex-direction: column; gap: 0;
    border-top: 1px solid var(--gray-3); padding-bottom: .5rem;
  }
  .main-nav.open { display: flex; }
  .main-nav a { border-bottom: 0; border-left: 8px solid transparent; }
  .main-nav a.active { border-left-color: var(--gold); }
}


/* --- Footer (ASU global footer) ------------------------------------------ */
footer.asu-footer { margin-top: 3rem; }
.footer-social {
  background: var(--dark);
  padding: 2.2rem 0;
}
.footer-social .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; }
.footer-social img.endorsed { height: 64px; width: auto; }
.social-icons { display: flex; gap: .8rem; }
.social-icons a, .social-icons > span {
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--white); color: var(--dark);
  display: flex; align-items: center; justify-content: center;
  text-decoration: none;
}
.social-icons a:hover { background: var(--gold); }
.social-icons > span { opacity: .45; }
.social-icons svg { width: 20px; height: 20px; fill: var(--dark); }

.footer-innovation { background: var(--white); padding: 1.4rem 0; border-bottom: 1px solid var(--gray-2); }
.footer-innovation .wrap { display: flex; justify-content: center; }
.footer-innovation img { height: 64px; width: auto; }

.footer-columns { background: var(--gray-2); padding: 1.6rem 0 .4rem; }
.footer-columns ul {
  list-style: none; margin: 0 auto; padding: 0;
  display: flex; flex-wrap: wrap; gap: .4rem 2.6rem; justify-content: center;
}
.footer-columns a { color: var(--dark); font-weight: 700; text-decoration: none; }
.footer-columns a:hover { text-decoration: underline; }

.footer-legal { background: var(--gray-2); padding: .9rem 0 2rem; }
.footer-legal ul {
  list-style: none; margin: 0 auto; padding: 0;
  display: flex; flex-wrap: wrap; gap: .3rem 1.8rem; justify-content: center;
}
.footer-legal a { color: var(--gray-7); font-size: .88rem; text-decoration: none; }
.footer-legal a:hover { text-decoration: underline; }