/* CSS Variables & Palette */
:root {
  --color-bg: #030308;
  --color-text: #f0f0f5;
  --color-accent: #00e5ff;
  --glass-bg: rgba(6, 6, 12, 0.55);
  --glass-border: rgba(255, 255, 255, 0.07);
  --glass-border-hover: rgba(255, 255, 255, 0.15);
  --glow-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'Space Grotesk', sans-serif;
}

/* Reset and Core Layout */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scrollbar-width: none; /* Hide default scrollbars */
  scroll-behavior: auto; /* Handled dynamically by GSAP */
}
html::-webkit-scrollbar {
  display: none; /* Hide scrollbar for Chrome, Safari, and Opera */
}

body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-display);
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* WebGL Background Canvas */
#webgl-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
  pointer-events: none;
}

/* Fixed HUD UI Overlay Container */
#ui-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none; /* Allows scrolling on content underneath */
  display: flex;
  align-items: center;
}

/* Glassmorphism Cards */
.ui-card {
  position: absolute;
  left: 8%;
  max-width: 440px;
  width: 84%;
  padding: 2.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 2px rgba(255, 255, 255, 0.05) inset;
  pointer-events: auto; /* Enable interaction with card buttons/elements */
  opacity: 0;
  transform: translateY(40px) scale(0.96);
  visibility: hidden;
  transition: opacity 0.6s cubic-bezier(0.215, 0.610, 0.355, 1.000),
              transform 0.6s cubic-bezier(0.215, 0.610, 0.355, 1.000),
              visibility 0.6s;
}

.ui-card.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  visibility: visible;
}

/* Card Header */
.card-header {
  margin-bottom: 1.5rem;
}

.category {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.4);
}

.ui-card h2 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: #fff;
  margin: 0;
}

/* Specific Card Styling Tweaks */
#card-overview h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.0;
  margin: 0.5rem 0 1.2rem;
  background: linear-gradient(135deg, #ffffff 40%, #8b9bb4 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.6);
}

.description {
  font-size: 1.05rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.75);
  font-weight: 300;
  margin-bottom: 2rem;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 1.5rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-item .label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.45);
}

.stat-item .value {
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
}

/* Fact text */
.fact {
  font-size: 0.95rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 300;
}

/* Scroll micro-animations */
.scroll-indicator {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.indicator-text {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.5);
}

.mouse-icon {
  width: 20px;
  height: 32px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 10px;
  position: relative;
}

.mouse-icon .wheel {
  width: 3px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 1.5px;
  position: absolute;
  top: 5px;
  left: 50%;
  transform: translateX(-50%);
  animation: mouseScroll 1.5s infinite;
  box-shadow: 0 0 6px var(--color-accent);
}

@keyframes mouseScroll {
  0% {
    opacity: 1;
    transform: translate(-50%, 0);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, 10px);
  }
}

/* Audio Control Button */
#sound-toggle {
  position: fixed;
  top: 2rem;
  left: 2rem;
  z-index: 20;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  pointer-events: auto;
}

#sound-toggle:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--glass-border-hover);
  transform: scale(1.08);
  box-shadow: var(--glow-shadow);
}

#sound-toggle svg {
  transition: transform 0.2s ease;
}

#sound-toggle:active svg {
  transform: scale(0.9);
}

.hidden {
  display: none !important;
}

/* Sidebar Navigation (Right panel) */
#sidebar-nav {
  position: fixed;
  right: 3rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}

.progress-bar-container {
  position: absolute;
  right: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 1px;
}

#progress-indicator {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  background: linear-gradient(to bottom, #ff5e00, var(--color-accent));
  border-radius: 1px;
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.5);
  transition: height 0.1s ease-out;
}

.nav-dots {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.nav-dot {
  width: 16px;
  height: 16px;
  background: rgba(2, 2, 4, 0.8);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.nav-dot:hover {
  border-color: #fff;
  background: #fff;
  transform: scale(1.2);
}

.nav-dot.active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent);
  transform: scale(1.25);
}

/* Dot tooltips */
.dot-tooltip {
  position: absolute;
  right: 2.2rem;
  top: 50%;
  transform: translateY(-50%) translateX(10px);
  background: rgba(4, 4, 8, 0.85);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #fff;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
  white-space: nowrap;
}

.nav-dot:hover .dot-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}

/* Scroll Container & Sections (Creates actual scroll height) */
.scroll-container {
  position: relative;
  width: 100%;
  z-index: 2; /* Sits on top of canvas for mousewheel scroll */
  pointer-events: auto; /* Allows dragging the scrollbar and scrolling naturally */
}

.scroll-section {
  width: 100%;
  height: 100vh;
}

/* Planet-specific Customization Rules */
#card-sun .category { color: #ffb300; text-shadow: 0 0 10px rgba(255,179,0,0.4); }
#card-mercury .category { color: #b0bec5; text-shadow: 0 0 10px rgba(176,190,197,0.4); }
#card-venus .category { color: #ffab91; text-shadow: 0 0 10px rgba(255,171,145,0.4); }
#card-earth .category { color: #81d4fa; text-shadow: 0 0 10px rgba(129,212,250,0.4); }
#card-mars .category { color: #ff8a65; text-shadow: 0 0 10px rgba(255,138,101,0.4); }
#card-jupiter .category { color: #ffe082; text-shadow: 0 0 10px rgba(255,224,130,0.4); }
#card-saturn .category { color: #ffd54f; text-shadow: 0 0 10px rgba(255,213,79,0.4); }
#card-uranus .category { color: #80deea; text-shadow: 0 0 10px rgba(128,222,234,0.4); }
#card-neptune .category { color: #90caf9; text-shadow: 0 0 10px rgba(144,202,249,0.4); }

/* Responsive adjustments */
@media (max-width: 768px) {
  #sidebar-nav {
    right: 1.5rem;
  }
  .ui-card {
    left: 5%;
    right: 5%;
    width: 90%;
    padding: 1.5rem;
    max-height: 80vh;
    overflow-y: auto;
  }
  .ui-card h2 {
    font-size: 2.2rem;
  }
  #card-overview h1 {
    font-size: 2.6rem;
  }
  .stats-grid {
    gap: 0.75rem;
    padding: 1rem 0;
  }
  .stat-item .value {
    font-size: 1rem;
  }
  #sound-toggle {
    top: 1rem;
    left: 1rem;
    width: 40px;
    height: 40px;
  }
}