:root {
  --bg1: #020311;
  --muted: rgba(230,240,255,0.92);
  --glass: rgba(255,255,255,0.03);
  --accent1: linear-gradient(90deg,#7ad7ff,#ffcbf8);
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  background: radial-gradient(1000px 500px at 10% 10%, #07112a 0%, #020311 40%, #000 100%);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  color: var(--muted);
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}

canvas {
  position: fixed;
  inset: 0;
  display: block;
  z-index: 1;
}

.topbar, header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 28px;
  backdrop-filter: blur(6px);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-bottom: 1px solid rgba(255,255,255,0.03);
  z-index: 80;
  animation: fadeIn 1.5s forwards;
}

.logo {
  font-weight: 700;
  font-size: 28px;
  letter-spacing: 2px;
  background: linear-gradient(90deg,#7ad7ff,#ffffff,#ffcbf8);
  -webkit-background-clip: text;
  color: transparent;
  transition: transform .25s ease, opacity .25s ease;
}

.logo:hover {
  transform: scale(1.05);
  opacity: .95;
}

.nav {
  display: flex;
  gap: 18px;
}

.nav a {
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  font-size: 15px;
  padding: 6px 8px;
  border-radius: 8px;
  transition: all .18s ease;
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg,#7ad7ff,#ffffff,#ffcbf8);
  transition: 0.4s;
}

.nav a:hover::after {
  width: 100%;
}

.nav a:hover {
  transform: translateY(-2px);
  color: #fff;
}

.stage {
  width: 100%;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

#space {
  position: fixed;
  inset: 0;
  display: block;
  z-index: 1;
}

#space::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('https://i.ibb.co/7Yt6S5Q/stars.png') repeat;
  background-size: cover;
  animation: moveStars 120s linear infinite;
  z-index: 0;
}

#ui, #orbits, #controls {
  position: fixed;
  inset: 0;
  pointer-events: auto;
}

.planet-btn {
  position: absolute;
  transform: translate(-50%, -50%);
  border: 0;
  background: transparent;
  cursor: pointer;
  border-radius: 50%;
  transition: transform .18s cubic-bezier(.2,.8,.2,1), box-shadow .18s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.planet-btn .visual {
  pointer-events: none;
  border-radius: 50%;
  display: block;
  animation: pulse 3s ease-in-out infinite;
}

.planet-btn:focus {
  box-shadow: 0 0 18px rgba(122,215,255,0.25);
  transform: translate(-50%, -50%) scale(1.08);
}

.planet-btn:hover .visual {
  box-shadow: 0 0 25px rgba(122,215,255,0.3), 0 0 40px rgba(255,203,248,0.25);
  transform: scale(1.08);
}

.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.03);
  transform: translate(-50%, -50%);
  pointer-events: none;
  mix-blend-mode: screen;
  z-index: 18;
  transition: opacity .6s ease, transform .6s ease, box-shadow .4s;
  animation: slowRotate 30s linear infinite;
}

.orbit-ring.hidden { opacity: 0; }
.orbit-ring.visible {
  opacity: 1;
  box-shadow: 0 0 28px rgba(122,215,255,0.02) inset;
}

#info {
  position: fixed;
  z-index: 70;
  min-width: 220px;
  max-width: 360px;
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.06);
  backdrop-filter: blur(6px);
  padding: 14px;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.7);
  transform-origin: top left;
  opacity: 0;
  visibility: hidden;
  transition: opacity .22s ease, transform .22s cubic-bezier(.2,.8,.2,1);
  pointer-events: none;
}

#info[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
  transform: scale(1);
}

#info[aria-hidden="true"] {
  transform: scale(.98);
}

#infoClose {
  position: absolute;
  top: 8px;
  right: 8px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 16px;
  cursor: pointer;
}

#infoTitle {
  margin: 6px 0 8px;
  font-size: 18px;
  background: var(--accent1);
  -webkit-background-clip: text;
  color: transparent;
}

#infoDesc {
  margin: 0 0 10px;
  font-size: 14px;
  color: rgba(230,240,255,0.95);
  line-height: 1.4;
}

#infoFacts {
  margin: 0;
  padding-left: 18px;
  font-size: 13px;
  color: rgba(210,225,240,0.95);
}

.planet-glow {
  filter: blur(8px);
  opacity: .9;
  mix-blend-mode: screen;
}

.sun {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120px;
  height: 120px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, #fff89c 0%, #ffcb00 60%, #ff7f00 100%);
  box-shadow: 0 0 80px #fff89c, 0 0 120px #ffcb00, 0 0 200px #ff7f00;
  z-index: 10;
  animation: sunPulse 5s ease-in-out infinite;
}

.content {
  position: relative;
  z-index: 5;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: white;
  text-align: center;
  backdrop-filter: blur(3px);
  opacity: 0;
  animation: fadeIn 2s forwards;
}

h1 {
  font-size: 64px;
  letter-spacing: 4px;
  text-transform: uppercase;
  margin: 0 0 10px;
  background: linear-gradient(90deg, #7ad7ff, #ffffff, #ffcbf8);
  -webkit-background-clip: text;
  color: transparent;
  animation: pulseText 3s infinite alternate;
}

h1:hover {
  transform: scale(1.05);
  text-shadow: 0 0 20px rgba(122, 215, 255, 0.7), 0 0 30px rgba(255, 203, 248, 0.6);
}

p {
  font-size: 20px;
  max-width: 600px;
  opacity: 0.85;
  margin-bottom: 40px;
  animation: fadeInText 2s forwards 0.5s;
}

.btns {
  display: flex;
  gap: 20px;
  margin-bottom: 40px;
}

.btns a {
  text-decoration: none;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 18px;
  color: white;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25);
  transition: all 0.35s ease;
  backdrop-filter: blur(4px);
  position: relative;
  overflow: hidden;
}

.btns a::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, #7ad7ff, #ffffff, #ffcbf8, #7ad7ff);
  background-size: 400% 400%;
  z-index: 0;
  filter: blur(10px);
  opacity: 0;
  transition: 0.5s;
}

.btns a:hover::before {
  opacity: 0.5;
  animation: gradientMove 4s linear infinite;
}

.btns a:hover {
  transform: scale(1.08) rotate(-1deg);
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.4);
  box-shadow: 0 0 25px rgba(255,255,255,0.35), 0 0 40px rgba(122,215,255,0.25);
}

.btns a span {
  position: relative;
  z-index: 1;
}

footer {
  position: fixed;
  bottom: 10px;
  width: 100%;
  text-align: center;
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  letter-spacing: 1px;
  z-index: 5;
  text-shadow: 0 0 5px rgba(255,255,255,0.2);
  pointer-events: none;
}

body, html {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: linear-gradient(to bottom, #000011, #000033);
}

#space {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

#space::before {
  pointer-events: none;
}

#ui,
#orbits {
  pointer-events: none;
}

#controls {
  pointer-events: auto;
  z-index: 32; 
}

.planet-btn {
  z-index: 33;
  position: absolute; 
}

#info {
  z-index: 100;
  pointer-events: none; 
}

.sun,
#space,
canvas {
  -webkit-user-select: none;
  user-select: none;
}

.planet-btn .visual {
  pointer-events: none;
}


@keyframes pulseText {
  0% { transform: scale(1); text-shadow: 0 0 5px rgba(255,255,255,0.2); }
  50% { transform: scale(1.02); text-shadow: 0 0 15px rgba(255,255,255,0.6); }
  100% { transform: scale(1); text-shadow: 0 0 5px rgba(255,255,255,0.2); }
}

@keyframes gradientMove {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes fadeIn {
  0% { opacity: 0; transform: translateY(20px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInText {
  0% { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes slowRotate {
  from { transform: translate(-50%, -50%) rotate(0); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

@keyframes sunPulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.05); }
}

@keyframes moveStars {
  0% { transform: translate(0,0); }
  100% { transform: translate(-1000px, 500px); }
}

@media (max-width:720px) {
  #info { max-width: 92%; min-width: 200px; padding: 12px; }
  .topbar { padding: 10px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  #info, .planet-btn, .nav a { transition: none; }
}