:root {
  --bg-900: #0a0f1c; /* darkest space */
  --bg-800: #10182a; /* deep navy */
  --accent: #4fc3f7; /* ocean blue */
  --accent-2: #81c784; /* earth green */
  --muted: #a0aec0; /* gray-blue text */
  --glass: rgba(255, 255, 255, 0.05);
  --radius: 16px;
  --max-width: 1100px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  cursor: url(../Media/Space.cur), auto;
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  color: #e9f2ff;
  background-color: var(--bg-800);
  line-height: 1.6;
}

#vanta-bg,
#stars,
#halo,
#earth-particles,
#earth {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

#vanta-bg {
  z-index: -5;
}

#stars {
  z-index: -4;
}

#halo {
  z-index: -3;
}

#earth-particles {
  z-index: -2;
}

#earth {
  z-index: -1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.globe {
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: url(../Media/earth.jpg);
  background-size: cover;
  animation: spin 240s linear infinite;
  position: relative;
  box-shadow: inset -30px 0 50px rgba(0, 0, 0, 0.6),
    0 0 80px rgba(79, 195, 247, 0.6);
}

/* Cloud layer */
.globe::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: url(../Media/earth\ clouds.jpg);
  background-size: cover;
  opacity: 0.35;
  animation: spinClouds 360s linear infinite;
}

/* Glow around Earth */
.globe::after {
  content: "";
  position: absolute;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(79, 195, 247, 0.25),
    transparent 70%
  );
  z-index: -1;
}

@keyframes spin {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -200% 0;
  }
}

@keyframes spinClouds {
  from {
    background-position: 0 0;
  }
  to {
    background-position: -100% 0;
  }
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

h1,
h2 {
  font-family: "Orbitron", sans-serif;
  font-weight: 700;
  color: #fff;
}

h2 {
  font-size: 2rem;
  margin-bottom: 24px;
  padding-left: 16px;
  border-left: 4px solid var(--accent-2); /* green highlight */
}

p {
  margin-bottom: 1rem;
}

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

.main-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  background: linear-gradient(
    180deg,
    rgba(3, 4, 10, 0.7) 0%,
    rgba(3, 4, 10, 0) 100%
  );
}

.main-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-brand .logo-icon {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 12px;
}

.header-brand .logo-icon i {
  font-size: 22px;
  color: var(--bg-900);
}

.header-brand .brand-text h1 {
  font-size: 1.2rem;
  margin: 0;
}

.main-nav-links a {
  padding: 8px 16px;
  color: #fff;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 99px;
  transition: all 0.2s ease;
  backdrop-filter: blur(5px);
}

.main-nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.4);
}

.planet-hero {
  min-height: 50vh;
  padding: 120px 0 60px;
  display: flex;
  align-items: flex-end;
  position: relative;
  background: transparent;
}

.planet-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: left;
}

.planet-tag {
  display: inline-block;
  padding: 4px 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 99px;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--bg-900);
  box-shadow: 0 0 10px rgba(79, 195, 247, 0.5);
}

.planet-hero h1 {
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 16px;
  background: linear-gradient(
    90deg,
    var(--accent),
    var(--accent-2),
    var(--accent)
  );
  background-size: 200% auto; /* ✅ allows shimmer */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 20px rgba(79, 195, 247, 0.4);
  animation: shimmer 6s linear infinite; /* ✅ shimmer effect */
}

@keyframes shimmer {
  0% {
    background-position: 200% center;
  }
  100% {
    background-position: -200% center;
  }
}

.hero-content p {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 60ch;
}

.planet-info {
  padding: 40px 0 80px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 60px;
}

.stat-card {
  background: var(--bg-900);
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-card .icon {
  font-size: 24px;
  color: var(--accent);
  margin-bottom: 12px;
}

.stat-card h3 {
  font-size: 0.9rem;
  color: var(--muted);
  font-family: "Inter";
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.stat-card p {
  font-size: 1.25rem;
  color: #fff;
  font-weight: 600;
}

.structure-section {
  margin-bottom: 60px;
  padding: 24px;
  background: linear-gradient(
    135deg,
    rgba(79, 195, 247, 0.05),
    rgba(129, 199, 132, 0.05)
  );
  border: 1px solid rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(5px); /* ✅ subtle blur */
  border-radius: var(--radius);
  box-shadow: 0 0 20px rgba(79, 195, 247, 0.15);
}

.structure-section h2 {
  font-size: 2rem;
  margin-bottom: 16px;
  padding-left: 16px;
  border-left: 4px solid var(--accent); /* ocean blue */
  color: var(--accent); /* matches Earth's oceans */
  display: flex;
  align-items: center;
  gap: 8px;
}

.structure-section p {
  color: var(--muted);
  max-width: 80ch;
  line-height: 1.7;
}

.discoveries-section h2 {
  font-size: 2rem;
  margin-bottom: 24px;
  padding-left: 16px;
  border-left: 4px solid var(--accent-2); /* green */
}

.discoveries-list {
  list-style: none;
  counter-reset: discoveries-counter;
}

.discovery-item {
  background: var(--bg-900);
  padding: 20px 24px 20px 70px;
  border-radius: 12px;
  margin-bottom: 16px;
  position: relative;
  font-size: 1.05rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.discovery-item::before {
  content: counter(discoveries-counter);
  counter-increment: discoveries-counter;
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--bg-900);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: "Orbitron", sans-serif;
  font-weight: 700;
}

/* --------- Footer --------- */
.main-footer {
  padding: 48px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(3, 4, 10, 0.5);
  text-align: center;
}

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

/* Scrollbar Styling - Chrome, Edge, Safari */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-900); /* darkest background */
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-2) 100%);
  border-radius: 6px;
  border: 2px solid var(--bg-900); /* spacing effect */
  transition: all 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent-2) 0%, var(--accent) 100%);
  box-shadow: 0 0 10px var(--accent), 0 0 15px var(--accent-2);
}

/* Scrollbar Styling - Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--accent) var(--bg-900);
}

/* Text Selection */
::selection {
  background: var(--accent);
  color: var(--bg-900);
  text-shadow: 0 0 6px var(--accent-2), 0 0 12px var(--accent);
}

::-moz-selection {
  background: var(--accent);
  color: var(--bg-900);
  text-shadow: 0 0 6px var(--accent-2), 0 0 12px var(--accent);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .main-nav-links {
    display: none;
  }
}

@media (max-width: 500px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }
}