/* Rush EM — Components: header, nav, footer, buttons, cards, marquee, hero. */

/* =================== Buttons =================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--dur-base) var(--ease-out),
              color var(--dur-base) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.btn--primary {
  background: var(--color-green);
  color: var(--color-ink);
  border-color: var(--color-green);
}
.btn--primary:hover {
  background: var(--color-green-soft);
  border-color: var(--color-green-soft);
  color: var(--color-ink);
}

.btn--ghost {
  background: transparent;
  color: var(--color-bone);
  border-color: var(--color-hairline-strong);
}
.btn--ghost:hover {
  border-color: var(--color-bone);
  color: var(--color-bone);
}

.btn--lg { padding: 1.05rem var(--space-5); font-size: var(--fs-body); }

.apply-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* =================== Site Header =================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(var(--color-ink-rgb), 0.72);
  backdrop-filter: blur(12px) saturate(140%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--color-hairline);
}

.site-header__bar {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-h);
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}
.site-header__brand img { width: auto; height: 28px; }

.site-header__cta { margin-left: auto; }

/* =================== Primary Nav =================== */

.nav-primary { display: none; }

@media (min-width: 900px) {
  .nav-primary { display: block; flex: 1; }
  .nav-primary__list {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .nav-primary__list > li { margin: 0; }
  .nav-primary__list a,
  .submenu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    padding: var(--space-2) var(--space-3);
    color: var(--color-bone);
    font-size: var(--fs-small);
    font-weight: var(--fw-medium);
    text-decoration: none;
    background: none;
    border: 0;
    border-radius: var(--radius-sm);
    cursor: pointer;
  }
  .nav-primary__list a:hover,
  .submenu-trigger:hover { color: var(--color-green); }

  .submenu-trigger__chevron {
    width: 8px; height: 8px;
    border-right: 1px solid currentColor;
    border-bottom: 1px solid currentColor;
    transform: translateY(-2px) rotate(45deg);
    transition: transform var(--dur-fast) var(--ease-out);
  }
  .submenu-trigger[aria-expanded="true"] .submenu-trigger__chevron {
    transform: translateY(2px) rotate(-135deg);
  }

  .has-submenu { position: relative; }
  .submenu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    min-width: 220px;
    margin: 0;
    padding: var(--space-2);
    list-style: none;
    background: var(--color-surface-2);
    border: 1px solid var(--color-hairline);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-2);
  }
  .submenu li { margin: 0; }
  .submenu a {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--color-bone);
    text-decoration: none;
    font-size: var(--fs-small);
  }
  .submenu a:hover {
    background: var(--color-surface-3);
    color: var(--color-green);
  }
  .submenu[hidden] { display: none; }
}

/* =================== Mobile Nav =================== */

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px; height: 40px;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--color-hairline-strong);
  border-radius: var(--radius-sm);
}
.nav-toggle__bar {
  display: block;
  width: 18px; height: 1.5px;
  background: var(--color-bone);
  transition: transform var(--dur-base) var(--ease-out);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(3.25px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  transform: translateY(-3.25px) rotate(-45deg);
}

.nav-mobile {
  position: fixed;
  inset: 0;
  background: var(--color-ink);
  z-index: 60;
  overflow-y: auto;
  padding: calc(var(--header-h) + var(--space-4)) var(--gutter-x) var(--space-7);
}
.nav-mobile[hidden] { display: none; }

.nav-mobile__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.nav-mobile__list > li > a {
  display: block;
  padding: var(--space-2) 0;
  font-size: var(--fs-h3);
  font-family: var(--font-display);
  font-weight: var(--fw-semibold);
  color: var(--color-bone);
  text-decoration: none;
  border-bottom: 1px solid var(--color-hairline);
}
.nav-mobile__group ul {
  list-style: none;
  padding: 0;
  margin: var(--space-2) 0 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.nav-mobile__group ul a {
  color: var(--color-bone-dim);
  text-decoration: none;
  font-size: var(--fs-body);
}
.nav-mobile__group ul a:hover { color: var(--color-green); }
.nav-mobile__cta {
  margin-top: var(--space-5);
  width: 100%;
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .nav-mobile { display: none !important; }
}

@media (max-width: 899px) {
  .site-header__cta { display: none; }
}

/* =================== Hero =================== */

.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: var(--color-ink);
}
.hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero__media img,
.hero__media picture {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 55%;
  background: linear-gradient(180deg, transparent 0%, rgba(var(--color-ink-rgb), 0.85) 80%, var(--color-ink) 100%);
  z-index: 1;
  pointer-events: none;
}
.hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-block: var(--space-7);
}
.hero__content { max-width: 56ch; }
.hero__title {
  font-size: var(--fs-display);
  line-height: var(--lh-tight);
  margin: var(--space-3) 0;
}
.hero__lede {
  font-size: var(--fs-h3);
  font-weight: var(--fw-regular);
  color: var(--color-bone-dim);
  margin: 0 0 var(--space-5);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.hero__meta {
  margin-top: var(--space-6);
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  color: var(--color-bone-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
}
.hero__meta span + span::before {
  content: "·";
  margin-right: var(--space-3);
  color: var(--color-hairline-strong);
}

/* Smaller, sub-page hero */
.hero--page {
  min-height: 48vh;
  align-items: flex-end;
}
.hero--page .hero__title { font-size: var(--fs-h1); }

/* =================== Cards =================== */

.card {
  background: var(--color-surface-1s);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
}
.card:hover {
  background: var(--color-surface-2);
  border-color: var(--color-hairline-strong);
  transform: translateY(-2px);
}
.card__title { font-size: var(--fs-h3); margin: var(--space-2) 0 var(--space-3); }
.card__body  { color: var(--color-bone-dim); margin-bottom: var(--space-4); }
.card__link  {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  color: var(--color-green);
  text-decoration: none;
  font-weight: var(--fw-medium);
}
.card__link::after { content: "→"; transition: transform var(--dur-fast) var(--ease-out); }
.card__link:hover::after { transform: translateX(3px); }

/* Person grid layout */
.person-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

/* Person card (faculty/residents) */
.card-person {
  background: var(--color-surface-1s);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card-person__photo {
  aspect-ratio: 1 / 1;
  background: var(--color-surface-2);
}
.card-person__photo img { width: 100%; height: 100%; object-fit: cover; }
.card-person__body { padding: var(--space-3); }
.card-person__name { font-size: var(--fs-h4); margin: 0 0 var(--space-1); }
.card-person__role {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--color-bone-muted);
}

/* =================== Marquee (stats strip) =================== */

.marquee {
  position: relative;
  border-block: 1px solid var(--color-hairline);
  overflow: hidden;
  background: var(--color-ink);
}
.marquee__track {
  display: inline-flex;
  gap: var(--space-7);
  padding-block: var(--space-4);
  white-space: nowrap;
  animation: marquee-scroll 36s linear infinite;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: var(--tracking-meta);
  text-transform: uppercase;
  color: var(--color-bone-dim);
}
.marquee:hover .marquee__track { animation-play-state: paused; }
.marquee__item { display: inline-flex; align-items: baseline; gap: 0.5em; }
.marquee__num {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: var(--fw-semibold);
  letter-spacing: var(--tracking-tight);
  color: var(--color-green);
}
@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce) {
  .marquee__track { animation: none; flex-wrap: wrap; white-space: normal; }
}

/* =================== Site Footer =================== */

.site-footer {
  background: var(--color-ink);
  border-top: 1px solid var(--color-hairline);
  margin-top: var(--space-8);
}
.site-footer__inner {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  padding-block: var(--space-7);
}
.site-footer__brand img { height: 28px; width: auto; margin-bottom: var(--space-3); }
.site-footer__tagline { color: var(--color-bone-dim); font-size: var(--fs-small); }

.site-footer__heading { margin-bottom: var(--space-3); }
.site-footer__col ul { list-style: none; padding: 0; margin: 0; }
.site-footer__col li + li { margin-top: var(--space-2); }
.site-footer__col a {
  color: var(--color-bone-dim);
  text-decoration: none;
  font-size: var(--fs-small);
}
.site-footer__col a:hover { color: var(--color-green); }
.site-footer__col address {
  font-style: normal;
  color: var(--color-bone-dim);
  font-size: var(--fs-small);
  line-height: var(--lh-snug);
}

.site-footer__legal {
  border-top: 1px solid var(--color-hairline);
  padding-block: var(--space-4);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  align-items: center;
  color: var(--color-bone-muted);
  font-size: var(--fs-meta);
}
.site-footer__legal-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.site-footer__legal-links li { margin: 0; }
.site-footer__legal-links a {
  color: var(--color-bone-muted);
  text-decoration: none;
}
.site-footer__legal-links a:hover { color: var(--color-bone); }

/* =================== Fellowship block =================== */
.fellowship-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: start;
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-hairline);
}
.fellowship-block:first-of-type { border-top: none; }
.fellowship-block__photo { border-radius: var(--radius-md); overflow: hidden; align-self: start; }
.fellowship-block__photo img { width: 100%; height: 100%; object-fit: cover; display: block; }
.fellowship-block__content { display: flex; flex-direction: column; gap: var(--space-3); }
.fellowship-block__content h2 { margin: 0; }
.fellowship-block__director { color: var(--color-green); font-weight: 500; margin: 0; }
.fellowship-block__duration { margin: 0; }

@media (max-width: 768px) {
  .fellowship-block { grid-template-columns: 1fr; }
}