:root {
  --bg-deep: #030712;
  --bg-glass: rgba(15, 23, 42, 0.75);
  --border-cyan: rgba(56, 189, 248, 0.25);
  --accent-cyan: #38bdf8;
  --accent-gold: #fbbf24;
  --accent-purple: #c084fc;
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --font-sans: 'Space Grotesk', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

body {
  background-color: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-sans);
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

.simulation-container {
  position: relative;
  width: 100%;
  height: 100%;
}

/* Top Navigation */
.top-nav {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.75rem;
  background: linear-gradient(180deg, rgba(3, 7, 18, 0.95) 0%, rgba(3, 7, 18, 0) 100%);
  pointer-events: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  pointer-events: auto;
}

.brand-icon {
  font-size: 1.6rem;
}

.brand h1 {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand .subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.brand .subtitle a {
  color: var(--accent-cyan);
  text-decoration: none;
}

.presets-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  pointer-events: auto;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border-cyan);
}

.preset-label {
  font-size: 0.65rem;
  font-weight: 700;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  margin-right: 0.25rem;
}

.btn-preset {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-preset:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

.btn-preset.active {
  color: #030712;
  background: var(--accent-cyan);
  font-weight: 700;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
}

.stats-badge {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-cyan);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  pointer-events: auto;
}

/* 3D Canvas & Slingshot */
#canvas-container {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

.slingshot-layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 10;
}

/* Left Control Drawer */
.control-drawer {
  position: absolute;
  top: 5.5rem;
  left: 1.75rem;
  width: 290px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-cyan);
  border-radius: 16px;
  padding: 1.25rem;
  z-index: 25;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.drawer-header h3 {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  font-weight: 700;
}

.body-type-selector {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.4rem;
}

.type-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.5rem 0.6rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.type-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-primary);
}

.type-btn.active {
  border-color: var(--accent-cyan);
  color: var(--text-primary);
  background: rgba(56, 189, 248, 0.15);
}

.dot-icon {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.dot-planet { background-color: #38bdf8; }
.dot-giant { background-color: #fb923c; }
.dot-star { background-color: #facc15; box-shadow: 0 0 8px #facc15; }
.dot-hole { background-color: #a855f7; box-shadow: 0 0 8px #a855f7; }

/* Sliders */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.slider-group label span:last-child {
  font-family: var(--font-mono);
  color: var(--accent-cyan);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

/* Toggles */
.toggle-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 0.75rem;
}

.toggle-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
}

.toggle-item input[type="checkbox"] {
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

/* Actions */
.drawer-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-action {
  flex: 1;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.55rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-action:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-danger:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
  color: #ef4444;
}

.slingshot-tip {
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.4;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 0.6rem;
}

/* Bottom Ticker */
.bottom-ticker {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.6rem 1.5rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  background: linear-gradient(0deg, rgba(3, 7, 18, 0.95) 0%, rgba(3, 7, 18, 0) 100%);
  pointer-events: none;
}