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

:root {
  --glass-bg: rgba(8, 12, 28, 0.55);
  --glass-border: rgba(120, 180, 255, 0.18);
  --accent: #5eead4;
  --accent-glow: rgba(94, 234, 212, 0.35);
  --text: #e8f0ff;
  --text-muted: rgba(200, 220, 255, 0.55);
  --panel-radius: 16px;
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Exo 2', sans-serif;
}

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #020108;
  color: var(--text);
  font-family: var(--font-body);
}

#canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

/* Loading */
#loading {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  background: radial-gradient(ellipse at center, #0a0a2e 0%, #020108 70%);
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

#loading.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-ring {
  width: 64px;
  height: 64px;
  border: 3px solid rgba(94, 234, 212, 0.15);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  box-shadow: 0 0 30px var(--accent-glow);
}

#loading p {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  animation: pulse 2s ease-in-out infinite;
}

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

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

/* Glass panel */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid var(--glass-border);
  border-radius: var(--panel-radius);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.panel {
  padding: 1.25rem 1.5rem;
}

/* UI overlay */
.ui-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

.ui-overlay > * {
  pointer-events: auto;
}

/* Header */
.header-panel {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.sim-clock {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-left: 1.5rem;
  border-left: 1px solid var(--glass-border);
}

.sim-label {
  font-size: 0.62rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
}

#sim-time {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--accent);
  text-shadow: 0 0 12px var(--accent-glow);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.logo-icon {
  font-size: 2rem;
  filter: drop-shadow(0 0 12px #ffaa00);
  animation: sunPulse 3s ease-in-out infinite;
}

@keyframes sunPulse {
  0%, 100% { transform: scale(1); filter: drop-shadow(0 0 12px #ffaa00); }
  50% { transform: scale(1.08); filter: drop-shadow(0 0 20px #ffcc44); }
}

.logo h1 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: linear-gradient(135deg, #fff 30%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 0.15rem;
}

/* Control panel */
.control-panel {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: min(280px, calc(100vw - 2.5rem));
  max-height: calc(100vh - 2.5rem);
  overflow-y: auto;
}

.control-panel h2 {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.control-group {
  margin-bottom: 1.1rem;
}

.control-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

#speed-value {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 0.78rem;
}

input[type="range"] {
  width: 100%;
  height: 4px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent-glow);
  cursor: pointer;
}

.btn {
  font-family: var(--font-body);
  font-size: 0.82rem;
  padding: 0.55rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
  margin-right: 0.5rem;
  margin-bottom: 0.4rem;
}

.btn:hover {
  background: rgba(94, 234, 212, 0.12);
  border-color: var(--accent);
}

.btn.primary {
  background: rgba(94, 234, 212, 0.15);
  border-color: rgba(94, 234, 212, 0.4);
}

.toggles {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
}

.toggle input {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

/* Planet list */
.planet-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.planet-chip {
  font-size: 0.72rem;
  padding: 0.3rem 0.65rem;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-body);
}

.planet-chip:hover,
.planet-chip.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(94, 234, 212, 0.1);
}

/* Info panel */
.info-panel {
  position: absolute;
  bottom: 1.25rem;
  left: 1.25rem;
  width: min(360px, calc(100vw - 2.5rem));
  transform: translateY(0);
  transition: transform 0.35s ease, opacity 0.35s ease;
}

.info-panel.collapsed {
  transform: translateY(calc(100% + 2rem));
  opacity: 0;
  pointer-events: none;
}

.close-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s;
}

.close-btn:hover {
  color: var(--text);
}

.info-content h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
  color: var(--accent);
}

.info-en {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.85rem;
}

.info-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
}

.stat-item {
  background: rgba(255, 255, 255, 0.04);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
}

.stat-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 0.82rem;
  margin-top: 0.15rem;
}

.info-desc {
  font-size: 0.82rem;
  line-height: 1.6;
  color: rgba(220, 235, 255, 0.75);
}

/* Hint bar */
.hint {
  position: absolute;
  bottom: 1.25rem;
  right: 1.25rem;
  display: flex;
  gap: 2.4rem;
  padding: 1.2rem 2.4rem;
  font-size: 1.44rem;
  color: var(--text-muted);
}

.hint span {
  white-space: nowrap;
}

.site-badge {
  position: absolute;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.35rem 0.9rem;
  font-family: var(--font-display);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  pointer-events: none;
}

/* Labels (Three.js CSS2D) */
.planet-label {
  font-family: var(--font-display);
  font-size: 11px;
  color: rgba(220, 240, 255, 0.85);
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.9);
  pointer-events: none;
  letter-spacing: 0.05em;
  padding: 2px 6px;
  background: rgba(0, 0, 0, 0.35);
  border-radius: 4px;
  white-space: nowrap;
}

/* Responsive */
@media (max-width: 768px) {
  .header-panel {
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.75rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }

  .sim-clock {
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--glass-border);
    padding-top: 0.5rem;
    width: 100%;
  }

  .logo h1 {
    font-size: 0.95rem;
  }

  .control-panel {
    top: auto;
    bottom: 0.75rem;
    right: 0.75rem;
    left: 0.75rem;
    width: auto;
    max-height: 40vh;
  }

  .info-panel {
    left: 0.75rem;
    bottom: auto;
    top: 5rem;
    width: calc(100vw - 1.5rem);
  }

  .hint {
    display: none;
  }
}

@media (max-width: 480px) {
  .control-panel {
    max-height: 35vh;
  }

  .planet-list {
    display: none;
  }
}

/* Scrollbar */
.control-panel::-webkit-scrollbar {
  width: 4px;
}

.control-panel::-webkit-scrollbar-thumb {
  background: rgba(94, 234, 212, 0.3);
  border-radius: 2px;
}