/* ==========================================================================
   Exploraversity — site styles
   A foundation / research-institute aesthetic for K–12 science education.
   ========================================================================== */

:root {
  --navy:        #0e2a47;
  --navy-deep:   #081c31;
  --navy-soft:   #16375a;
  --teal:        #1f7a8c;
  --teal-light:  #3fa7bb;
  --gold:        #d9a441;
  --gold-soft:   #e8c67d;
  --ink:         #1c2430;
  --slate:       #4a5568;
  --mist:        #f4f7fa;
  --mist-2:      #e9eff5;
  --line:        #d9e2ec;
  --white:       #ffffff;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --wrap: 1140px;
  --shadow-sm: 0 1px 3px rgba(14, 42, 71, .08), 0 1px 2px rgba(14, 42, 71, .06);
  --shadow-md: 0 8px 24px rgba(14, 42, 71, .10);
  --shadow-lg: 0 20px 50px rgba(14, 42, 71, .16);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  line-height: 1.65;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  color: var(--navy);
  letter-spacing: -0.01em;
}

p { margin: 0 0 1.1rem; }

a { color: var(--teal); text-decoration: none; transition: color .15s ease; }
a:hover { color: var(--navy); }

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

.wrap { width: min(var(--wrap), 92%); margin-inline: auto; }

.eyebrow {
  font-family: var(--sans);
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .74rem;
  font-weight: 700;
  color: var(--teal);
  margin: 0 0 .9rem;
}
.eyebrow.on-dark { color: var(--gold-soft); }

.lede { font-size: 1.24rem; color: var(--slate); line-height: 1.6; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-weight: 600;
  font-size: .96rem;
  padding: .8rem 1.5rem;
  border-radius: 999px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform .12s ease, box-shadow .15s ease, background .15s ease;
}
.btn-primary { background: var(--gold); color: var(--navy-deep); }
.btn-primary:hover { background: var(--gold-soft); color: var(--navy-deep); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; border-color: rgba(255,255,255,.5); color: var(--white); }
.btn-ghost:hover { background: rgba(255,255,255,.12); color: var(--white); border-color: var(--white); }
.btn-outline { background: transparent; border-color: var(--teal); color: var(--teal); }
.btn-outline:hover { background: var(--teal); color: var(--white); transform: translateY(-2px); }

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}
.brand { display: flex; align-items: center; gap: .7rem; }
.brand .mark {
  width: 40px; height: 40px; flex: none;
}
.brand .name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.32rem;
  color: var(--navy);
  letter-spacing: -0.02em;
  line-height: 1;
}
.brand .name span { color: var(--teal); }
.brand small {
  display: block;
  font-family: var(--sans);
  font-size: .62rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--slate);
  font-weight: 600;
  margin-top: 3px;
}

.nav-links { display: flex; align-items: center; gap: .35rem; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  display: block;
  padding: .55rem .85rem;
  color: var(--ink);
  font-weight: 500;
  font-size: .95rem;
  border-radius: 8px;
}
.nav-links a:hover { background: var(--mist); color: var(--navy); }
.nav-links a.active { color: var(--teal); }
.nav-links a.active::after {
  content: "";
  display: block;
  height: 2px;
  background: var(--gold);
  border-radius: 2px;
  margin: 3px .85rem 0;
}
.nav-cta { margin-left: .6rem; }
.nav-cta .btn { padding: .55rem 1.15rem; font-size: .9rem; }

.nav-toggle {
  display: none;
  background: none; border: none;
  cursor: pointer; padding: .4rem;
}
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--navy); margin: 5px 0; border-radius: 2px; transition: .2s; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 500px at 78% -10%, rgba(63,167,187,.28), transparent 60%),
    radial-gradient(900px 480px at 8% 110%, rgba(217,164,65,.18), transparent 55%),
    linear-gradient(160deg, var(--navy-deep), var(--navy) 55%, var(--navy-soft));
  color: #eaf1f8;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(70% 60% at 60% 30%, #000 30%, transparent 75%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 2; padding: 6.5rem 0 6rem; max-width: 760px; }
.hero h1 { color: #fff; font-size: clamp(2.4rem, 5vw, 3.9rem); margin: 0 0 1.3rem; }
.hero h1 em { font-style: italic; color: var(--gold-soft); }
.hero p { font-size: 1.28rem; color: #c6d6e6; max-width: 620px; }
.hero-actions { display: flex; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; }
.hero-badge {
  display: inline-flex; align-items: center; gap: .55rem;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.16);
  padding: .4rem .9rem; border-radius: 999px;
  font-size: .82rem; letter-spacing: .04em; color: #d7e4f1;
  margin-bottom: 1.6rem;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 4px rgba(217,164,65,.25); }

/* ---------- Stat strip ---------- */
.stats {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: rgba(255,255,255,.12);
  border-top: 1px solid rgba(255,255,255,.14);
}
.stats .stat { background: var(--navy-deep); padding: 1.6rem 1.4rem; }
.stats .num { font-family: var(--serif); font-size: 2rem; color: var(--gold-soft); line-height: 1; }
.stats .lbl { font-size: .82rem; color: #b9cadd; margin-top: .4rem; letter-spacing: .02em; }

/* ==========================================================================
   Sections
   ========================================================================== */
.section { padding: 5.5rem 0; }
.section.tight { padding: 4rem 0; }
.section.mist { background: var(--mist); }
.section.ink {
  background: linear-gradient(165deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: #dbe6f1;
}
.section.ink h2, .section.ink h3 { color: #fff; }

.section-head { max-width: 720px; margin-bottom: 3rem; }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: clamp(1.9rem, 3.4vw, 2.7rem); margin: 0 0 1rem; }
.section-head p { font-size: 1.12rem; color: var(--slate); margin: 0; }
.section.ink .section-head p { color: #b9cadd; }

/* ---------- Feature grid ---------- */
.grid { display: grid; gap: 1.6rem; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--teal-light); }
.card .icon {
  width: 52px; height: 52px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(150deg, var(--teal), var(--navy));
  color: #fff; margin-bottom: 1.2rem;
}
.card .icon svg { width: 26px; height: 26px; }
.card h3 { font-size: 1.3rem; margin: 0 0 .6rem; }
.card p { color: var(--slate); margin: 0; font-size: .98rem; }
.card .tag {
  display: inline-block; margin-top: 1rem;
  font-size: .74rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--teal); background: var(--mist-2); padding: .25rem .6rem; border-radius: 6px;
}

/* ---------- Split feature ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.split.reverse .split-media { order: 2; }
.split-media {
  border-radius: 20px; overflow: hidden;
  min-height: 340px;
  background: linear-gradient(150deg, var(--navy), var(--teal));
  position: relative;
  box-shadow: var(--shadow-lg);
  display: grid; place-items: center;
}
.split-media .glyph { color: rgba(255,255,255,.9); width: 120px; height: 120px; }
.split-media::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.07) 1px, transparent 1px);
  background-size: 30px 30px;
}
.split-body h2 { font-size: 2rem; margin: 0 0 1rem; }
.split-body ul { margin: 1.2rem 0 0; padding: 0; list-style: none; }
.split-body ul li {
  position: relative; padding-left: 1.7rem; margin-bottom: .7rem; color: var(--slate);
}
.split-body ul li::before {
  content: ""; position: absolute; left: 0; top: .55em;
  width: 8px; height: 8px; border-radius: 2px; background: var(--gold);
  transform: rotate(45deg);
}

/* ==========================================================================
   Page hero (interior pages)
   ========================================================================== */
.page-hero {
  background:
    radial-gradient(800px 380px at 85% -20%, rgba(63,167,187,.3), transparent 60%),
    linear-gradient(160deg, var(--navy-deep), var(--navy));
  color: #eaf1f8;
  padding: 4.5rem 0 3.8rem;
  position: relative;
  overflow: hidden;
}
.page-hero::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(60% 80% at 80% 20%, #000, transparent 70%);
}
.page-hero .inner { position: relative; z-index: 2; max-width: 760px; }
.page-hero h1 { color: #fff; font-size: clamp(2.1rem, 4vw, 3.1rem); margin: .3rem 0 1rem; }
.page-hero p { color: #c6d6e6; font-size: 1.16rem; max-width: 640px; margin: 0; }
.crumbs { font-size: .84rem; color: #9fb6cd; letter-spacing: .03em; }
.crumbs a { color: #cfe0f0; }

/* ==========================================================================
   Program detail rows
   ========================================================================== */
.prog {
  display: grid; grid-template-columns: 64px 1fr; gap: 1.6rem;
  padding: 2.2rem 0; border-bottom: 1px solid var(--line);
}
.prog:last-child { border-bottom: none; }
.prog .num {
  font-family: var(--serif); font-size: 1.5rem; color: var(--white);
  width: 56px; height: 56px; border-radius: 14px;
  background: linear-gradient(150deg, var(--teal), var(--navy));
  display: grid; place-items: center;
}
.prog h3 { font-size: 1.45rem; margin: 0 0 .6rem; }
.prog p { color: var(--slate); margin: 0 0 .8rem; }
.prog .meta { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.pill {
  font-size: .78rem; font-weight: 600; letter-spacing: .02em;
  padding: .3rem .75rem; border-radius: 999px;
  background: var(--mist-2); color: var(--navy-soft);
}
.pill.accent { background: rgba(217,164,65,.18); color: #8a6414; }

/* ==========================================================================
   People
   ========================================================================== */
.people { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.8rem; }
.person {
  background: var(--white); border: 1px solid var(--line); border-radius: 16px;
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease;
}
.person:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.person .avatar {
  height: 150px; display: grid; place-items: center;
  background: linear-gradient(150deg, var(--navy), var(--teal));
  position: relative;
}
.person .avatar::before {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.08) 1px, transparent 1px);
  background-size: 26px 26px;
}
.person .initials {
  position: relative; z-index: 2;
  font-family: var(--serif); font-size: 2.3rem; color: #fff;
  width: 84px; height: 84px; border-radius: 50%;
  display: grid; place-items: center;
  background: rgba(255,255,255,.12); border: 2px solid rgba(255,255,255,.35);
}
.person .body { padding: 1.5rem 1.5rem 1.8rem; }
.person h3 { font-size: 1.22rem; margin: 0 0 .2rem; }
.person .role { color: var(--teal); font-weight: 600; font-size: .9rem; letter-spacing: .02em; margin-bottom: .8rem; }
.person .bio { color: var(--slate); font-size: .92rem; margin: 0; }

/* ==========================================================================
   Research areas
   ========================================================================== */
.research-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.6rem; }
.research-card {
  border: 1px solid var(--line); border-radius: 16px; padding: 2rem;
  background: var(--white); box-shadow: var(--shadow-sm);
}
.research-card h3 { display: flex; align-items: center; gap: .6rem; font-size: 1.3rem; margin: 0 0 .5rem; }
.research-card .field { font-size: .78rem; text-transform: uppercase; letter-spacing: .1em; color: var(--teal); font-weight: 700; }
.research-card p { color: var(--slate); margin: .6rem 0 0; font-size: .96rem; }

.chips { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.4rem; }
.chip { background: var(--white); border: 1px solid var(--line); color: var(--navy-soft); padding: .45rem 1rem; border-radius: 999px; font-size: .88rem; font-weight: 500; }

/* ==========================================================================
   Contact
   ========================================================================== */
.contact-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: start; }
.contact-card {
  background: var(--white); border: 1px solid var(--line); border-radius: 18px;
  padding: 2.4rem; box-shadow: var(--shadow-md);
}
.field-row { margin-bottom: 1.2rem; }
.field-row label { display: block; font-weight: 600; font-size: .9rem; color: var(--navy); margin-bottom: .4rem; }
.field-row input, .field-row textarea, .field-row select {
  width: 100%; padding: .8rem 1rem; border: 1.5px solid var(--line); border-radius: 10px;
  font-family: inherit; font-size: 1rem; color: var(--ink); background: var(--mist);
  transition: border-color .15s ease, background .15s ease;
}
.field-row input:focus, .field-row textarea:focus, .field-row select:focus {
  outline: none; border-color: var(--teal); background: #fff;
}
.field-row textarea { min-height: 130px; resize: vertical; }

.info-block { margin-bottom: 2rem; }
.info-block .label { font-size: .74rem; text-transform: uppercase; letter-spacing: .14em; color: var(--teal); font-weight: 700; margin-bottom: .35rem; }
.info-block .val { font-size: 1.12rem; color: var(--navy); font-weight: 500; }
.info-block .val a { color: var(--navy); }
.info-block .val a:hover { color: var(--teal); }

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(150deg, var(--gold) 0%, var(--gold-soft) 100%);
  color: var(--navy-deep);
  border-radius: 22px;
  padding: 3.2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
  box-shadow: var(--shadow-lg);
}
.cta-band h2 { color: var(--navy-deep); font-size: 2rem; margin: 0 0 .5rem; }
.cta-band p { margin: 0; color: #5a4715; font-size: 1.08rem; }
.cta-band .btn-primary { background: var(--navy); color: #fff; }
.cta-band .btn-primary:hover { background: var(--navy-deep); color: #fff; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer { background: var(--navy-deep); color: #b9cadd; padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 2.5rem; }
.site-footer .brand .name { color: #fff; }
.site-footer .brand .name span { color: var(--gold-soft); }
.site-footer .brand small { color: #8ba3bd; }
.footer-about { margin-top: 1.2rem; font-size: .92rem; color: #93a9c2; max-width: 320px; }
.footer-col h4 { color: #fff; font-family: var(--sans); font-size: .8rem; text-transform: uppercase; letter-spacing: .12em; margin: 0 0 1rem; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: .6rem; }
.footer-col a { color: #b9cadd; font-size: .95rem; }
.footer-col a:hover { color: var(--gold-soft); }
.footer-bottom {
  margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid rgba(255,255,255,.1);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  font-size: .84rem; color: #7f97b2;
}
.footer-bottom .badge501 {
  border: 1px solid rgba(255,255,255,.18); border-radius: 8px; padding: .3rem .7rem; color: #a9bfd6;
}

/* ==========================================================================
   Prose (about page)
   ========================================================================== */
.prose { max-width: 760px; }
.prose h2 { font-size: 1.7rem; margin: 2.4rem 0 1rem; }
.prose h3 { font-size: 1.25rem; margin: 1.8rem 0 .6rem; }
.prose p { color: var(--slate); font-size: 1.05rem; }
.prose blockquote {
  margin: 2rem 0; padding: 1.4rem 1.8rem;
  border-left: 4px solid var(--gold);
  background: var(--mist); border-radius: 0 12px 12px 0;
  font-family: var(--serif); font-size: 1.3rem; color: var(--navy); font-style: italic;
}
.value-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; margin: 1.5rem 0; }
.value-item { padding: 1.4rem; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.value-item h4 { font-size: 1.1rem; margin: 0 0 .4rem; color: var(--navy); }
.value-item p { margin: 0; font-size: .95rem; color: var(--slate); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 960px) {
  .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .grid.cols-3 { grid-template-columns: repeat(2, 1fr); }
  .people { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 2rem; }
  .split.reverse .split-media { order: 0; }
  .split-media { min-height: 260px; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav-links, .nav-cta { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; top: 74px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 1rem 4%; gap: .2rem; box-shadow: var(--shadow-md);
  }
  .nav-links.open a { padding: .8rem 1rem; }
  .nav-links.open a.active::after { display: none; }
  .nav-toggle { display: block; }
  .cta-band { flex-direction: column; text-align: center; }
  .value-list, .research-grid, .grid.cols-2 { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .grid.cols-4, .grid.cols-3, .people { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
}