/*
 * layout.css — Navigation, footer
 * Desai Lab · Case Western Reserve University
 */

/* ===== NAVIGATION ===== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(251, 246, 236, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: background var(--ease);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--side-pad);
}

/* Logo */
.nav-logo {
  display: flex;
  flex-direction: column;
  gap: 3px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1;
  letter-spacing: -0.01em;
}

.nav-logo-name .dot {
  color: var(--accent);
}

.nav-logo-sub {
  font-family: var(--font-body);
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1;
}

/* Navigation links */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--ease);
  position: relative;
  padding-bottom: 3px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform var(--ease);
  transform-origin: left center;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--text);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* Hamburger button */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 30px;
  height: 30px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 2px;
  flex-shrink: 0;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
  transition: all var(--ease);
  transform-origin: center;
}

.nav-hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile menu */
@media (max-width: 920px) {
  .nav-hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: var(--sp-10) var(--side-pad);
    gap: var(--sp-8);
    transform: translateX(100%);
    transition: transform var(--ease-slow);
    border-top: 1px solid var(--border);
    overflow-y: auto;
  }

  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-link {
    font-size: 1.6rem;
    font-family: var(--font-display);
    font-weight: 500;
  }

  .nav-link[aria-current="page"] {
    color: var(--accent);
  }
}


/* ===== FOOTER ===== */

.footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: var(--sp-16) 0 var(--sp-8);
  margin-top: var(--sp-24);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--sp-12);
  padding-bottom: var(--sp-12);
  border-bottom: 1px solid var(--border);
  margin-bottom: var(--sp-8);
}

.footer-logo-name {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: var(--sp-3);
}

.footer-logo-name .dot {
  color: var(--accent);
}

.footer-tagline {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  max-width: 280px;
  margin-bottom: var(--sp-6);
}

.footer-social {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.5em 1em;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: all var(--ease);
  text-decoration: none;
}

.social-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.footer-section h3 {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--sp-5);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.footer-link {
  font-size: 0.92rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--ease);
}

.footer-link:hover {
  color: var(--accent);
}

.footer-address {
  margin-top: var(--sp-5);
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
  font-style: normal;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer-cwru {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
  }

  .footer {
    margin-top: var(--sp-16);
  }
}