:root {
  --bg: #061019;
  --bg-2: #0d1b2a;
  --panel: rgba(13, 27, 42, 0.78);
  --panel-solid: #11243a;
  --text: #f2fbff;
  --muted: #abc7d8;
  --cyan: #3df2ff;
  --green: #8dff78;
  --gold: #ffd166;
  --rose: #ff5c8a;
  --purple: #9d7dff;
  --line: rgba(255, 255, 255, 0.14);
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(61, 242, 255, 0.18), transparent 32rem),
    radial-gradient(circle at 80% 10%, rgba(141, 255, 120, 0.12), transparent 24rem),
    radial-gradient(circle at 50% 90%, rgba(157, 125, 255, 0.14), transparent 30rem),
    linear-gradient(135deg, var(--bg), #02060a 58%, #081420);
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
button, input, textarea { font: inherit; }
code { color: var(--green); }

.molecule-field {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: -1;
}
.molecule-field span {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background: var(--cyan);
  box-shadow: 0 0 24px var(--cyan), 34px 22px 0 -2px rgba(141,255,120,.8), -38px 18px 0 -3px rgba(255,209,102,.8);
  opacity: .24;
  animation: drift 18s linear infinite;
}
.molecule-field span:nth-child(1) { left: 10%; top: 20%; }
.molecule-field span:nth-child(2) { left: 78%; top: 16%; animation-duration: 23s; }
.molecule-field span:nth-child(3) { left: 62%; top: 72%; animation-duration: 19s; }
.molecule-field span:nth-child(4) { left: 20%; top: 84%; animation-duration: 26s; }
.molecule-field span:nth-child(5) { left: 90%; top: 52%; animation-duration: 21s; }
@keyframes drift { 50% { transform: translateY(-38px) rotate(180deg); } 100% { transform: translateY(0) rotate(360deg); } }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 4rem);
  background: rgba(6, 16, 25, 0.72);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: .8rem; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 16px;
  color: #061019;
  font-weight: 900;
  background: conic-gradient(from 120deg, var(--cyan), var(--green), var(--gold), var(--cyan));
  box-shadow: 0 0 28px rgba(61, 242, 255, .35);
}
.brand strong, .brand small { display: block; }
.brand small { color: var(--muted); font-size: .74rem; }
.nav-links { display: flex; gap: .5rem; align-items: center; }
.nav-links a {
  padding: .65rem .85rem;
  color: var(--muted);
  border-radius: 999px;
  transition: .2s ease;
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,.08); }
.nav-toggle { display: none; background: transparent; color: var(--text); border: 0; font-size: 1.6rem; }

main { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; }
.content-section, .hero { padding: clamp(4rem, 8vw, 7rem) 0; }
.section-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: clamp(2rem, 6vw, 5rem); align-items: center; }
.eyebrow {
  margin: 0 0 .8rem;
  color: var(--green);
  text-transform: uppercase;
  letter-spacing: .16em;
  font-size: .76rem;
  font-weight: 800;
}
h1, h2, h3 { font-family: "Space Grotesk", Inter, sans-serif; line-height: 1; margin: 0; }
h1 { font-size: clamp(3rem, 8vw, 6.8rem); letter-spacing: -0.07em; }
h2 { font-size: clamp(2.1rem, 5vw, 4.2rem); letter-spacing: -0.045em; }
h3 { font-size: 1.45rem; }
p { color: var(--muted); line-height: 1.7; }
.hero-text { font-size: clamp(1.05rem, 2vw, 1.3rem); max-width: 720px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin: 2rem 0; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: .85rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary { color: #031014; background: linear-gradient(135deg, var(--cyan), var(--green)); font-weight: 900; box-shadow: 0 18px 50px rgba(61, 242, 255, .2); }
.button.ghost { background: rgba(255,255,255,.06); color: var(--text); }

.science-stats { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1rem; max-width: 610px; }
.science-stats div, .lesson-card, .lab-panel, .lab-display, .question-form, .question-board, .update-card, .cta, .mission, .image-placeholder {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.035));
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.science-stats div { border-radius: 22px; padding: 1rem; }
.science-stats strong { display:block; font-size: 2rem; color: var(--cyan); }
.science-stats span { color: var(--muted); font-size: .9rem; }

.hero-visual { position: relative; min-height: 560px; display: grid; place-items: center; }
.orbit-card {
  position: relative;
  width: min(450px, 88vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61,242,255,.28), rgba(141,255,120,.04) 52%, transparent 68%);
  border: 1px solid rgba(61,242,255,.25);
  box-shadow: inset 0 0 80px rgba(61,242,255,.12), 0 0 80px rgba(61,242,255,.12);
}
.atom-orbit { position: absolute; inset: 14%; border: 2px solid rgba(61,242,255,.55); border-radius: 50%; animation: spin 12s linear infinite; }
.orbit-one { transform: rotate(32deg) scaleX(.64); }
.orbit-two { transform: rotate(-35deg) scaleX(.64); border-color: rgba(141,255,120,.55); animation-duration: 18s; }
.atom-orbit::after { content: ""; position: absolute; top: -7px; left: 50%; width: 14px; height: 14px; background: var(--gold); border-radius: 50%; box-shadow: 0 0 22px var(--gold); }
.nucleus { position: absolute; inset: 36%; display: grid; place-items: center; border-radius: 50%; background: linear-gradient(135deg, var(--rose), var(--purple)); font-weight: 900; font-size: 2.6rem; }
@keyframes spin { to { rotate: 360deg; } }
.floating-card { position: absolute; display: flex; align-items: center; gap: .5rem; padding: .9rem 1rem; border-radius: 20px; background: rgba(5, 13, 21, .82); border: 1px solid var(--line); box-shadow: var(--shadow); font-weight: 800; }
.microscope-card { top: 12%; left: 2%; }
.ai-card { right: 1%; top: 38%; }
.weld-card { bottom: 10%; left: 15%; }

.mission { display: grid; grid-template-columns: .85fr 1.15fr; gap: 2rem; padding: 2rem; border-radius: 34px; align-items: center; }
.section-heading { max-width: 720px; margin-bottom: 2rem; }
.card-grid, .updates-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1.2rem; }
.lesson-card, .update-card { position: relative; overflow: hidden; border-radius: 28px; padding: 1.4rem; min-height: 250px; }
.lesson-card::before { content: attr(data-icon); position: absolute; right: 1rem; top: .5rem; font-size: 5rem; opacity: .18; }
.lesson-card h3, .update-card h3 { margin: .8rem 0; }
.pill { display: inline-flex; padding: .35rem .7rem; border-radius: 999px; color: #041017; background: var(--gold); font-size: .78rem; font-weight: 900; }
.card-link { display: inline-flex; margin-top: 1rem; color: var(--green); font-weight: 800; }

.lab-section { padding-top: 2rem; }
.lab-panel { border-radius: 34px 34px 0 0; padding: 2rem; display: flex; justify-content: space-between; gap: 1.5rem; align-items: end; }
.lab-tools { display: flex; gap: .7rem; flex-wrap: wrap; }
.lab-tools button { border: 1px solid var(--line); background: rgba(255,255,255,.08); color: var(--text); border-radius: 999px; padding: .75rem 1rem; cursor: pointer; }
.lab-tools button.active { color: #041017; background: var(--green); font-weight: 900; }
.lab-display { border-top: 0; border-radius: 0 0 34px 34px; padding: 2rem; background: rgba(3, 12, 19, .76); }

.split-section { display: grid; grid-template-columns: .9fr 1.1fr; gap: 2rem; align-items: center; }
.image-placeholder { min-height: 460px; border-radius: 34px; display: grid; place-items: center; padding: 2rem; text-align: center; background: repeating-linear-gradient(135deg, rgba(61,242,255,.1), rgba(61,242,255,.1) 12px, rgba(255,255,255,.035) 12px, rgba(255,255,255,.035) 24px); }
.placeholder-icon { font-size: 5rem; filter: drop-shadow(0 0 20px rgba(61,242,255,.6)); }
.feature-list { list-style: none; padding: 0; margin: 2rem 0 0; display: grid; gap: 1rem; }
.feature-list li { display: grid; grid-template-columns: 44px 1fr; gap: .2rem 1rem; padding: 1rem; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.05); }
.feature-list li span { grid-row: span 2; font-size: 2rem; }
.feature-list p { margin: .25rem 0 0; }

.interaction-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 1.2rem; }
.question-form, .question-board { border-radius: 28px; padding: 1.4rem; }
label { display: grid; gap: .45rem; margin: 1rem 0; color: var(--muted); font-weight: 800; }
input, textarea { width: 100%; border: 1px solid var(--line); border-radius: 18px; padding: .9rem 1rem; background: rgba(0,0,0,.28); color: var(--text); outline: none; }
textarea { min-height: 140px; resize: vertical; }
.form-note { font-size: .85rem; }
.question-list { display: grid; gap: .8rem; }
.question-item { border: 1px solid var(--line); border-radius: 18px; padding: 1rem; background: rgba(255,255,255,.05); }
.question-item strong { color: var(--green); }
.question-item p { margin: .35rem 0 0; }

.cta { margin: 2rem 0 5rem; border-radius: 36px; padding: clamp(1.4rem, 4vw, 3rem); display: flex; justify-content: space-between; align-items: center; gap: 2rem; }
.site-footer { width: min(1180px, calc(100% - 2rem)); margin: 0 auto; padding: 2rem 0 3rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 1rem; color: var(--muted); }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links { position: absolute; inset: 76px 1rem auto; display: none; flex-direction: column; align-items: stretch; padding: 1rem; border: 1px solid var(--line); border-radius: 24px; background: rgba(6,16,25,.96); }
  .nav-links.open { display: flex; }
  .section-grid, .mission, .split-section, .interaction-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 430px; }
  .card-grid, .updates-grid { grid-template-columns: 1fr; }
  .lab-panel, .cta, .site-footer { flex-direction: column; align-items: flex-start; }
  .science-stats { grid-template-columns: 1fr; }
}