/* ==========================================================================
   Base: tokens, reset, shared components (buttons, nav, preloader, menu)
   ========================================================================== */

:root {
  /* Tulane greens */
  --green-950: #03160d;
  --green-900: #06281a;
  --green-800: #0b3b27;
  --green: #006747;
  --hero-green: #16684a;

  /* Accents */
  --sky: #71c5e8;
  --sky-100: #e6f6fd;
  --gold: #f5a800;
  --gold-hover: #ffb81f;

  /* Neutrals */
  --cream: #f5f1e8;
  --ink: #0f2219;
  --ink-muted: #4f6158;
  --line: rgba(15, 34, 25, 0.14);

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Inter Tight", "Inter", system-ui, sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);

  --gutter: clamp(1rem, 4vw, 3rem);
  --nav-h: 72px;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--green-950);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

body.is-loading,
body.menu-open { overflow: hidden; }

/* Lenis smooth scrolling (from lenis/dist/lenis.css) */
html.lenis,
html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
.lenis.lenis-stopped { overflow: hidden; }

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  background: var(--gold);
  color: var(--green-950);
  font-weight: 600;
  transform: translateY(-150%);
  transition: transform 0.3s var(--ease-out);
}
.skip-link:focus { transform: none; }

.kicker {
  margin: 0 0 clamp(1rem, 2.5vw, 2rem);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: color-mix(in srgb, currentColor 55%, transparent);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 46px;
  padding: 0 1.3rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.4s var(--ease-out), background-color 0.3s, box-shadow 0.4s var(--ease-out), color 0.3s;
}
.btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.4s var(--ease-out);
}
.btn:hover { transform: translateY(-2px); }
.btn:hover svg { transform: translateX(3px); }

.btn--gold {
  background: var(--gold);
  color: var(--green-950);
}
.btn--gold:hover {
  background: var(--gold-hover);
  box-shadow: 0 12px 30px -10px rgba(245, 168, 0, 0.75);
}

.btn--ghost {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}
.btn--ghost:hover { background: rgba(255, 255, 255, 0.14); }

/* ---------- Preloader ---------- */

.preloader {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  background: var(--green-900);
  transition: opacity 0.7s var(--ease-out), visibility 0.7s;
}
.preloader__inner {
  display: grid;
  justify-items: center;
  gap: 1.1rem;
}
.preloader__logo {
  width: min(240px, 55vw);
  animation: pre-bob 1.6s ease-in-out infinite;
}
.preloader__word {
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.4em;
}
.preloader__bar {
  width: 160px;
  height: 2px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.15);
  overflow: hidden;
}
.preloader__bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--sky), var(--gold));
  transform-origin: left;
  animation: pre-load 1.1s var(--ease-in-out) forwards;
}
body.is-ready .preloader {
  opacity: 0;
  visibility: hidden;
}

@keyframes pre-bob {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50% { transform: translateY(-8px) rotate(2deg); }
}
@keyframes pre-load {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* ---------- Navigation ---------- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 var(--gutter);
  color: #fff;
  transition: color 0.35s, transform 0.9s var(--ease-out), opacity 0.9s var(--ease-out);
}
.nav::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s, border-color 0.35s, backdrop-filter 0.35s;
}
.nav.is-scrolled::before {
  background: rgba(6, 40, 26, 0.55);
  border-color: rgba(255, 255, 255, 0.08);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
}
.nav.is-light { color: var(--ink); }
.nav.is-light::before {
  background: rgba(245, 241, 232, 0.78);
  border-color: var(--line);
}
body.menu-open .nav { color: #fff; }
body.menu-open .nav::before {
  background: transparent;
  border-color: transparent;
  backdrop-filter: none;
}

html.js body:not(.is-ready) .nav {
  opacity: 0;
  transform: translateY(-100%);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
/* Wordmark logo: the white-text version over dark backgrounds, the black-text one over light. */
.nav__logo {
  display: block;
  height: 34px;
  width: auto;
  transition: transform 0.5s var(--ease-out);
}
.nav__brand:hover .nav__logo { transform: translateY(-2px); }
.nav__logo--on-light { display: none; }
.nav.is-light .nav__logo--on-dark { display: none; }
.nav.is-light .nav__logo--on-light { display: block; }
body.menu-open .nav .nav__logo--on-dark { display: block; }
body.menu-open .nav .nav__logo--on-light { display: none; }

.nav__links {
  display: none;
  gap: clamp(1.25rem, 2.5vw, 2.25rem);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.nav__links a {
  position: relative;
  padding: 0.25rem 0;
  opacity: 0.85;
  transition: opacity 0.3s;
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1.5px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.45s var(--ease-out);
}
.nav__links a:hover { opacity: 1; }
.nav__links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav__cta {
  display: none;
  height: 40px;
  padding: 0 1.1rem;
  font-size: 0.85rem;
}

.nav__toggle {
  width: 44px;
  height: 44px;
  display: grid;
  place-content: center;
  gap: 6px;
  border-radius: 50%;
}
.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.45s var(--ease-out);
}
.nav__toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

@media (min-width: 480px) {
  .nav__cta { display: inline-flex; }
}
@media (min-width: 900px) {
  .nav__links { display: flex; }
  .nav__toggle { display: none; }
}

/* ---------- Mobile menu ---------- */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 45;
  display: flex;
  padding: calc(var(--nav-h) + 2rem) var(--gutter) 2rem;
  background: var(--green-900);
  color: #fff;
  clip-path: inset(0 0 100% 0);
  transition: clip-path 0.7s var(--ease-out);
}
.mobile-menu.is-open { clip-path: inset(0); }
.mobile-menu nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}
.mobile-menu a {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
  transition-delay: calc(var(--i) * 50ms + 150ms);
}
.mobile-menu a:not(.btn) {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 10vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.15;
}
.mobile-menu .btn { margin-top: 1.5rem; }
.mobile-menu.is-open a {
  opacity: 1;
  transform: none;
}

@media (min-width: 900px) {
  .mobile-menu { display: none; }
}

/* ---------- Scroll-in reveal ---------- */

html.js [data-inview] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  transition-delay: var(--d, 0ms);
}
html.js [data-inview].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- Footer ---------- */

/* The bottom 40vh is left empty for the watercolor that rises into it. */
.footer {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4rem clamp(0.5rem, 4vw, 3.75rem) 40vh;
  border-top: 1px solid var(--line);
  background: var(--cream);
  color: var(--ink);
  text-align: center;
}

.footer__main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(0.25rem, 3vw, 3rem);
  width: 100%;
}

.footer__links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1rem, 1.6vw, 1.25rem);
  min-width: 0;
}

.footer__wordmark {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 9.5vw, 9.5rem);
  font-weight: 300;
  line-height: 0.82;
  letter-spacing: -0.05em;
  translate: 0 0.12em;
}

/* Muted uppercase link with a gradient underline that draws in on hover. */
.footer__link {
  position: relative;
  display: inline-block;
  padding-bottom: 0.25rem;
  font-size: clamp(0.72rem, 1vw, 0.875rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--ink) 60%, transparent);
  transition: color 0.3s;
}
.footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--sky), var(--green), var(--gold));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease-out);
}
.footer__link:hover { color: var(--ink); }
.footer__link:hover::after { transform: scaleX(1); }
/* Socials without a URL yet: shown but inert. Add an href and drop aria-disabled to enable. */
.footer__link[aria-disabled="true"] { opacity: 0.4; cursor: default; }
.footer__link[aria-disabled="true"]:hover { color: color-mix(in srgb, var(--ink) 60%, transparent); }
.footer__link[aria-disabled="true"]:hover::after { transform: scaleX(0); }

/* Hosted by NextGen Institute: the lab's credit, the one place it appears on every page. */
.footer__by {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  margin-top: clamp(2.5rem, 4vw, 3.25rem);
  color: var(--ink);
}
.footer__by-label {
  font-size: clamp(0.6875rem, 0.9vw, 0.75rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--ink) 60%, transparent);
}
.footer__by img {
  display: block;
  height: 24px;
  width: auto;
  border-radius: 2px;
  transition: transform 0.35s var(--ease-out);
}
.footer__by-name {
  font-family: var(--font-display);
  font-size: clamp(0.95rem, 1.2vw, 1.05rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  background: linear-gradient(90deg, var(--sky), var(--green), var(--gold)) 0 100% / 0 1px no-repeat;
  padding-bottom: 2px;
  transition: background-size 0.35s var(--ease-out);
}
.footer__by:hover img { transform: translateY(-2px); }
.footer__by:hover .footer__by-name { background-size: 100% 1px; }

.footer__legal {
  margin: clamp(1.5rem, 3vw, 2rem) 0 0;
  font-size: clamp(0.6875rem, 0.9vw, 0.75rem);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--ink) 75%, transparent);
}

.footer__resources {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  margin-top: 0.75rem;
}
.footer__resources .footer__link { font-size: clamp(0.6875rem, 0.9vw, 0.75rem); }

/* Watercolor of Gibson Hall, fixed to the bottom; rises and sharpens as the page ends. */
.footer-art {
  --reveal: 0;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  height: 40vh;
  overflow: hidden;
  pointer-events: none;
  visibility: hidden;
  opacity: calc(0.35 + var(--reveal) * 0.65);
  transform: translateY(calc((1 - var(--reveal)) * 100%));
  -webkit-mask-image: linear-gradient(to top, #000 45%, rgba(0, 0, 0, 0.55) 72%, transparent);
  mask-image: linear-gradient(to top, #000 45%, rgba(0, 0, 0, 0.55) 72%, transparent);
  will-change: transform;
}
.footer-art.is-visible { visibility: visible; }
/* The blur lives on the image, not the container, so the credit stays sharp. */
.footer-art img {
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: center 52%;
  filter: blur(calc(18px - var(--reveal) * 15px)) saturate(calc(0.8 + var(--reveal) * 0.2));
  will-change: filter;
  animation: footer-drift 26s ease-in-out infinite alternate;
}
/* Artist credit, tucked in the corner like a signature. */
.footer-art__credit {
  position: absolute;
  right: clamp(0.75rem, 2vw, 1.5rem);
  bottom: clamp(0.5rem, 1.5vw, 1rem);
  pointer-events: auto;
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--ink) 70%, transparent);
  text-shadow: 0 0 6px var(--cream), 0 0 2px var(--cream);
  transition: color 0.2s;
}
.footer-art__credit:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 0.2em; }
@keyframes footer-drift {
  from { transform: scale(1.08) translate(-1.5%, 1%); }
  to { transform: scale(1.16) translate(1.5%, -2%); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}