:root {
  --bg: #02050f;
  --bg-2: #06152f;
  --text: #eef7ff;
  --muted: rgba(238, 247, 255, .68);
  --line: rgba(162, 210, 255, .18);
  --cyan: #6de6ff;
  --blue: #1f6fff;
  --violet: #8b7cff;
  --card: rgba(8, 20, 45, .56);
  --shadow: 0 25px 80px rgba(0, 0, 0, .45);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 72% 18%, rgba(38, 111, 255, .32), transparent 34%),
    radial-gradient(circle at 12% 80%, rgba(109, 230, 255, .16), transparent 34%),
    linear-gradient(135deg, var(--bg), #030614 45%, #061124);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-x: hidden;
}

#starfield, .noise, .space-video {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
#starfield { z-index: -4; }
.space-video {
  z-index: -5;
  object-fit: cover;
  opacity: .25;
  filter: saturate(1.2) contrast(1.15) brightness(.72);
}
.noise {
  z-index: -1;
  opacity: .18;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 220 220' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.4'/%3E%3C/svg%3E");
  mix-blend-mode: screen;
}

a { color: inherit; text-decoration: none; }
code {
  padding: .16rem .38rem;
  border: 1px solid var(--line);
  border-radius: .55rem;
  background: rgba(255,255,255,.06);
}

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px clamp(18px, 4vw, 64px);
  background: linear-gradient(180deg, rgba(2, 5, 15, .72), transparent);
  backdrop-filter: blur(16px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: .18em;
  font-size: .82rem;
}
.brand-mark {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: var(--cyan);
  box-shadow: 0 0 24px var(--cyan), 0 0 60px var(--blue);
}
.nav { display: flex; gap: clamp(16px, 3vw, 34px); color: var(--muted); font-size: .92rem; }
.nav a:hover { color: var(--text); }

main { padding: 110px clamp(18px, 4vw, 64px) 50px; }
.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, .86fr);
  gap: clamp(34px, 6vw, 92px);
  align-items: center;
}
.hero { min-height: calc(100vh - 120px); }
.eyebrow {
  margin: 0 0 18px;
  color: var(--cyan);
  letter-spacing: .22em;
  font-size: .76rem;
  font-weight: 800;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 900px;
  margin-bottom: 24px;
  font-size: clamp(3.2rem, 8vw, 8.7rem);
  line-height: .88;
  letter-spacing: -.075em;
  text-wrap: balance;
}
h2 { font-size: clamp(2rem, 4vw, 4.4rem); line-height: .95; letter-spacing: -.045em; }
h3 { font-size: 1.25rem; }
.lead {
  max-width: 760px;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.34rem);
  line-height: 1.65;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 34px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid var(--line);
}
.btn-primary {
  color: #001326;
  background: linear-gradient(135deg, var(--cyan), #ffffff 55%, #8ec7ff);
  box-shadow: 0 18px 55px rgba(109, 230, 255, .28);
}
.btn-ghost { background: rgba(255,255,255,.06); backdrop-filter: blur(16px); }

.planet-stage {
  position: relative;
  height: min(70vw, 690px);
  min-height: 430px;
  display: grid;
  place-items: center;
  perspective: 1200px;
}
.planet {
  position: relative;
  width: min(46vw, 490px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  box-shadow:
    inset -65px -30px 80px rgba(0, 0, 0, .64),
    inset 35px 18px 50px rgba(255,255,255,.12),
    0 0 90px rgba(31, 111, 255, .62),
    0 0 180px rgba(109, 230, 255, .16);
  animation: planetFloat 8s ease-in-out infinite;
}
.planet-surface {
  position: absolute;
  inset: -2%;
  background:
    linear-gradient(90deg, rgba(255,255,255,.04), transparent 35%, rgba(255,255,255,.11) 52%, transparent 70%),
    url('assets/neptune-texture.jpg') center/cover,
    radial-gradient(circle at 34% 26%, #6de6ff, #1759d5 48%, #08275e 76%, #031330);
  animation: rotateTexture 24s linear infinite;
}
.planet-glow {
  position: absolute;
  inset: -20%;
  border-radius: 50%;
  background: radial-gradient(circle at 36% 25%, rgba(255,255,255,.24), transparent 20%, transparent 48%, rgba(2,5,15,.78) 76%);
}
.orbit {
  position: absolute;
  border: 1px solid rgba(109,230,255,.24);
  border-radius: 50%;
  transform: rotateX(68deg) rotateZ(-24deg);
}
.orbit-wide { width: 90%; height: 56%; animation: spin 22s linear infinite; }
.orbit-tight { width: 70%; height: 42%; animation: spin 16s linear reverse infinite; opacity: .55; }
.triton {
  position: absolute;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: #c9f2ff;
  box-shadow: 0 0 22px #bff7ff;
  animation: tritonMove 11s linear infinite;
}
.scanline {
  position: absolute;
  width: 72%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 34px var(--cyan);
  animation: scan 3.6s ease-in-out infinite;
  opacity: .72;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 14px;
  margin: 42px 0 120px;
}
.metric-card, .glass, .science-card {
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px);
}
.metric-card {
  min-height: 170px;
  padding: 22px;
  border-radius: 28px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.metric-card.large { grid-column: span 2; }
.metric-card.accent { grid-column: span 2; background: linear-gradient(135deg, rgba(109,230,255,.2), rgba(31,111,255,.12)); }
.metric-label { color: var(--muted); font-size: .86rem; }
.metric-card strong { margin-top: 14px; font-size: clamp(2.2rem, 4vw, 4.3rem); line-height: .86; letter-spacing: -.06em; }
.metric-card small { margin-top: 12px; color: var(--muted); }

.glass { border-radius: 34px; padding: clamp(24px, 4vw, 42px); }
.mission { margin-bottom: 120px; align-items: stretch; }
.panel p { color: var(--muted); line-height: 1.7; }
.checklist { margin: 26px 0 0; padding: 0; list-style: none; color: var(--text); }
.checklist li { margin: 12px 0; padding-left: 30px; position: relative; }
.checklist li:before { content: "✦"; position: absolute; left: 0; color: var(--cyan); }
.map-card { position: relative; min-height: 420px; overflow: hidden; }
.map-card:before {
  content: "";
  position: absolute;
  inset: 22px;
  border-radius: 28px;
  border: 1px dashed rgba(109,230,255,.2);
}
.map-orbit { position: absolute; inset: 60px; border: 1px solid rgba(255,255,255,.14); border-radius: 50%; transform: rotate(-18deg); }
.sun, .node { position: absolute; border-radius: 50%; }
.sun { left: 18%; top: 45%; width: 34px; height: 34px; background: #fff5bd; box-shadow: 0 0 60px #ffd36d; }
.node-earth { left: 37%; top: 32%; width: 14px; height: 14px; background: #6de6ff; }
.node-neptune { right: 17%; bottom: 28%; width: 28px; height: 28px; background: #277dff; box-shadow: 0 0 42px #277dff; }
.node span { position: absolute; left: 22px; top: -8px; white-space: nowrap; font-size: .8rem; color: var(--muted); }
.route { position: absolute; left: 40%; top: 38%; width: 42%; height: 1px; background: linear-gradient(90deg, var(--cyan), transparent); transform: rotate(27deg); transform-origin: left; }
.map-caption { position: absolute; left: 32px; bottom: 28px; color: var(--muted); font-size: .85rem; }

.science { margin-bottom: 120px; }
.section-head { max-width: 840px; margin-bottom: 34px; }
.science-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.science-card { min-height: 280px; border-radius: 30px; padding: 26px; }
.science-card span { color: var(--cyan); font-weight: 900; letter-spacing: .18em; }
.science-card h3 { margin-top: 52px; }
.science-card p { color: var(--muted); line-height: 1.65; }

.status { display: grid; grid-template-columns: 1fr minmax(280px, .75fr); gap: 30px; align-items: center; margin-bottom: 60px; }
.status p { color: var(--muted); line-height: 1.65; }
.status-grid { display: grid; gap: 12px; }
.status-grid div {
  display: grid;
  grid-template-columns: 20px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-radius: 20px;
  background: rgba(255,255,255,.055);
  border: 1px solid rgba(255,255,255,.08);
}
.status-grid small { color: var(--muted); }
.dot { width: 11px; height: 11px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 18px var(--cyan); }
.dot.cold { background: var(--violet); }
.dot.pulse { animation: pulse 1.4s ease-in-out infinite; }

.footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 34px clamp(18px, 4vw, 64px);
  color: rgba(238,247,255,.52);
  border-top: 1px solid var(--line);
  font-size: .82rem;
}

@keyframes rotateTexture { to { transform: translateX(-4%) scale(1.03); } }
@keyframes planetFloat { 0%,100% { transform: translateY(0) rotate(-2deg); } 50% { transform: translateY(-22px) rotate(2deg); } }
@keyframes spin { to { transform: rotateX(68deg) rotateZ(336deg); } }
@keyframes tritonMove {
  0% { transform: translate(-260px, 80px) scale(.7); opacity: .45; }
  45% { transform: translate(230px, -88px) scale(1.2); opacity: 1; }
  100% { transform: translate(-260px, 80px) scale(.7); opacity: .45; }
}
@keyframes scan { 0%,100% { transform: translateY(-160px); opacity: 0; } 45%,55% { opacity: .9; } 100% { transform: translateY(160px); } }
@keyframes pulse { 50% { transform: scale(1.4); opacity: .48; } }

@media (max-width: 980px) {
  .nav { display: none; }
  .section-grid, .status { grid-template-columns: 1fr; }
  .planet-stage { min-height: 360px; height: 55vw; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .metric-card.large, .metric-card.accent { grid-column: span 2; }
  .science-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer { flex-direction: column; }
}
@media (max-width: 620px) {
  main { padding-top: 88px; }
  h1 { font-size: clamp(3rem, 17vw, 5rem); }
  .metrics, .science-grid { grid-template-columns: 1fr; }
  .metric-card.large, .metric-card.accent { grid-column: auto; }
  .planet { width: min(82vw, 360px); }
  .hero-actions .btn { width: 100%; }
}