@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600&family=Noto+Sans+SC:wght@400;500;700&display=swap');

:root {
  --bg: #040714;
  --bg-card: rgba(255, 255, 255, 0.06);
  --bg-card-strong: rgba(5, 91, 250, 0.12);
  --text: #f5f7ff;
  --muted: #a8b3d8;
  --accent: #4de0ff;
  --accent-strong: #8a7dff;
  --border: rgba(255, 255, 255, 0.12);
  --gradient: linear-gradient(120deg, #5f5bff, #1b9dff, #4de0ff);
  --radius: 22px;
  --transition: 0.3s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans SC', 'Space Grotesk', system-ui, -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, rgba(77, 224, 255, 0.18), transparent 45%),
              radial-gradient(circle at 20% 20%, rgba(138, 125, 255, 0.25), transparent 35%),
              var(--bg);
  min-height: 100vh;
  line-height: 1.6;
  padding-bottom: 4rem;
}

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

a {
  color: inherit;
  text-decoration: none;
}

section {
  padding: 5rem clamp(1.5rem, 5vw, 6rem);
}

.hero {
  min-height: 100vh;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  padding: 2rem clamp(1.5rem, 5vw, 6rem) 4rem;
  position: relative;
  overflow: hidden;
}

.hero.sub-page {
  min-height: auto;
  padding-bottom: 2rem;
  row-gap: 1rem;
}

.hero.sub-page .hero-visual {
  display: none;
}

.hero.sub-page .tag {
  letter-spacing: 0.35em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 0.4rem clamp(1.5rem, 5vw, 6rem);
  background: rgba(4, 7, 20, 0.92);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-weight: 600;
}

.logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--gradient);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2.2rem;
  align-items: center;
}

.nav-links a {
  position: relative;
  z-index: 1;
  display: inline-flex;
  letter-spacing: 0.18em;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  transition: var(--transition);
  color: var(--muted);
  font-weight: 500;
}

.nav-links a::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: rgba(255, 255, 255, 0.08);
  opacity: 0;
  transition: var(--transition);
  z-index: -1;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  font-size: 0.9rem;
  letter-spacing: 0.22em;
  text-align: left;
}

.brand-text span {
  color: var(--text);
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a:hover::after {
  opacity: 1;
}

body[data-page="home"] .nav-links a[data-link="home"],
body[data-page="mission"] .nav-links a[data-link="mission"],
body[data-page="programs"] .nav-links a[data-link="programs"],
body[data-page="research"] .nav-links a[data-link="research"],
body[data-page="life"] .nav-links a[data-link="life"],
body[data-page="admission"] .nav-links a[data-link="admission"] {
  color: var(--text);
}

body[data-page="home"] .nav-links a[data-link="home"]::after,
body[data-page="mission"] .nav-links a[data-link="mission"]::after,
body[data-page="programs"] .nav-links a[data-link="programs"]::after,
body[data-page="research"] .nav-links a[data-link="research"]::after,
body[data-page="life"] .nav-links a[data-link="life"]::after,
body[data-page="admission"] .nav-links a[data-link="admission"]::after {
  opacity: 1;
  background: rgba(77, 224, 255, 0.2);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
}

.hero-content {
  align-self: center;
}

.tag {
  display: inline-flex;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  line-height: 1.1;
  margin: 1rem 0;
}

.hero p {
  max-width: 480px;
  color: var(--muted);
}

.hero-actions {
  margin-top: 1.5rem;
  display: flex;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.8rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: var(--transition);
}

.btn.primary {
  background: var(--gradient);
  color: var(--bg);
}

.btn.ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn.primary:hover {
  filter: brightness(1.1);
}

.btn.ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hero-visual {
  position: relative;
  min-height: 360px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.orbit {
  width: min(420px, 80vw);
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px dashed rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  animation: rotate 18s linear infinite;
}

.planet {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff, #66d8ff 35%, #3167ff 70%);
  box-shadow: 0 0 40px rgba(77, 224, 255, 0.6);
}

.satellite {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--accent-strong);
  position: absolute;
  top: 5%;
  right: 15%;
  box-shadow: 0 0 30px rgba(138, 125, 255, 0.6);
}

.pulse {
  position: absolute;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(77, 224, 255, 0.2);
  filter: blur(30px);
  animation: pulse 6s ease-in-out infinite;
}

.section-head {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.8rem;
  color: var(--muted);
}

a h2,
.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin-top: 0.7rem;
}

.pillars .grid,
.programs .program-list,
.research-grid,
.life-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.pillars article,
.programs article,
.research-grid article,
.life-grid article {
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  min-height: 200px;
  transition: transform var(--transition), border-color var(--transition);
}

.pillars article:hover,
.programs article:hover,
.research-grid article:hover,
.life-grid article:hover {
  transform: translateY(-4px);
  border-color: rgba(77, 224, 255, 0.5);
}

.stats {
  padding: 3rem clamp(1.5rem, 5vw, 6rem);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  text-align: center;
}

.stat {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: var(--bg-card-strong);
}

.value {
  font-size: 2rem;
  font-weight: 600;
}

.label {
  color: var(--muted);
  font-size: 0.9rem;
}

.research {
  background: rgba(255, 255, 255, 0.02);
}

.research-grid article {
  border-color: rgba(77, 224, 255, 0.2);
}

.caption {
  text-transform: uppercase;
  letter-spacing: 0.25em;
  font-size: 0.75rem;
  color: var(--muted);
}

.admission {
  text-align: center;
}

.admission-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 2rem 0 2.5rem;
}

.admission-steps div {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: var(--bg-card);
}

.step {
  display: inline-flex;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(77, 224, 255, 0.15);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

footer {
  border-top: 1px solid var(--border);
  padding: 2rem clamp(1.5rem, 5vw, 6rem);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.9rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .nav {
    flex-wrap: wrap;
    gap: 1rem;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 0.5rem 1.1rem;
  }

  .nav {
    flex-wrap: nowrap;
    align-items: flex-start;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
    display: none;
    background: rgba(4, 7, 20, 0.95);
    padding: 1rem;
    border-radius: var(--radius);
    margin-top: 0.75rem;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links a {
    width: 100%;
    justify-content: center;
    letter-spacing: 0.1em;
    padding: 0.5rem;
  }

  .hero {
    padding-top: 1rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0% { transform: scale(0.8); opacity: 0.4; }
  50% { transform: scale(1.15); opacity: 0.1; }
  100% { transform: scale(0.8); opacity: 0.4; }
}