/* ==========================================
   PLANET SECTION STYLES
   ========================================== */

/* General Planet Section */
.planet-section {
  min-height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) var(--spacing-md);
  overflow: hidden;
}

.planet-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.1;
  z-index: 1;
  pointer-events: none;
}

.planet-content {
  position: relative;
  z-index: 10;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.planet-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.planet-name {
  font-size: clamp(3rem, 8vw, 5rem);
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 0 30px currentColor;
}

.planet-type {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--star-glow);
  text-transform: uppercase;
  letter-spacing: 3px;
  font-weight: 300;
}

/* Stats Grid */
.planet-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.stat-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: var(--spacing-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition-medium);
}

.stat-card:hover {
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-5px);
}

.stat-label {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--star-glow);
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

/* Why Interesting Section */
.planet-highlight {
  background: rgba(255, 255, 255, 0.08);
  border-left: 4px solid currentColor;
  border-radius: 12px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(10px);
}

.planet-highlight h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.planet-highlight p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
}

/* Key Features */
.planet-features {
  margin-bottom: var(--spacing-lg);
}

.planet-features h3 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.features-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-sm);
}

.features-list li {
  background: rgba(255, 255, 255, 0.05);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 30px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: all var(--transition-fast);
}

.features-list li:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(5px);
}

.features-list li::before {
  content: '→';
  font-size: 1.5rem;
  color: currentColor;
}

/* Fun Fact */
.fun-fact {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
  border-radius: 20px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  border: 2px solid rgba(255, 255, 255, 0.2);
}

.fun-fact-label {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--star-glow);
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
}

.fun-fact-text {
  font-size: 1.3rem;
  line-height: 1.6;
  font-weight: 500;
}

/* Further Reading */
.further-reading {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 16px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.further-reading h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toggle-icon {
  transition: transform var(--transition-fast);
}

.further-reading.collapsed .toggle-icon {
  transform: rotate(-90deg);
}

.reading-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 500px;
  overflow: hidden;
  transition: max-height var(--transition-medium);
}

.further-reading.collapsed .reading-links {
  max-height: 0;
}

.reading-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: all var(--transition-fast);
}

.reading-link:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateX(10px);
}

/* Back Button */
.back-to-home {
  text-align: center;
  margin-top: var(--spacing-lg);
}

.back-to-home .btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* ==========================================
   INDIVIDUAL PLANET STYLES
   ========================================== */

/* HD 189733 b - Blue Glass Planet */
#hd-189733-b {
  background: linear-gradient(135deg, #001a4d 0%, #003d7a 50%, #0047AB 100%);
}

#hd-189733-b .planet-name {
  color: var(--hd189733b-secondary);
}

#hd-189733-b .planet-highlight {
  border-left-color: var(--hd189733b-secondary);
}

#hd-189733-b::before {
  background: radial-gradient(circle at 30% 50%, var(--hd189733b-secondary) 0%, transparent 50%);
}

/* WASP-76b - Iron Rain Planet */
#wasp-76b {
  background: linear-gradient(135deg, #4a0000 0%, #8B0000 50%, #FF6B35 100%);
}

#wasp-76b .planet-name {
  color: var(--wasp76b-primary);
}

#wasp-76b .planet-highlight {
  border-left-color: var(--wasp76b-primary);
}

#wasp-76b::before {
  background: radial-gradient(circle at 70% 30%, var(--wasp76b-primary) 0%, transparent 50%);
}

/* 55 Cancri e - Lava Ocean Planet */
#cancri-e {
  background: linear-gradient(135deg, #330000 0%, #660000 50%, #FF4500 100%);
}

#cancri-e .planet-name {
  color: var(--cancri-secondary);
}

#cancri-e .planet-highlight {
  border-left-color: var(--cancri-secondary);
}

#cancri-e::before {
  background: radial-gradient(circle at 50% 50%, var(--cancri-primary) 0%, transparent 50%);
}

/* Kepler-16b - Tatooine Planet with Yellow Stripes */
#kepler-16b {
  background: linear-gradient(135deg, #8B7355 0%, #A89078 50%, #C4B5A0 100%);
  position: relative;
}

#kepler-16b::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    repeating-linear-gradient(
      165deg,
      transparent 0%,
      transparent 15%,
      rgba(218, 186, 0, 0.3) 15%,
      rgba(218, 186, 0, 0.3) 20%,
      transparent 20%,
      transparent 35%
    ),
    repeating-linear-gradient(
      -15deg,
      transparent 0%,
      transparent 20%,
      rgba(218, 186, 0, 0.2) 20%,
      rgba(218, 186, 0, 0.2) 25%,
      transparent 25%,
      transparent 45%
    );
  pointer-events: none;
  z-index: 1;
  opacity: 0.7;
}

#kepler-16b .planet-content {
  position: relative;
  z-index: 10;
}

#kepler-16b .planet-name {
  color: #DAB900;
  text-shadow: 0 0 20px rgba(218, 185, 0, 0.5);
}

#kepler-16b .planet-highlight {
  border-left-color: #DAB900;
}

#kepler-16b::before {
  background: radial-gradient(circle at 40% 40%, rgba(255, 165, 0, 0.4) 0%, transparent 40%),
              radial-gradient(circle at 60% 40%, rgba(255, 200, 87, 0.3) 0%, transparent 40%);
}

/* TrES-2b - Darkest Planet */
#tres-2b {
  background: linear-gradient(135deg, #000000 0%, #0a0a0a 50%, #1C1C1C 100%);
}

#tres-2b .planet-name {
  color: var(--tres2b-secondary);
}

#tres-2b .planet-highlight {
  border-left-color: var(--tres2b-secondary);
}

#tres-2b::before {
  background: radial-gradient(circle at 50% 50%, var(--tres2b-secondary) 0%, transparent 70%);
  opacity: 0.2;
}

/* Responsive */
@media (max-width: 768px) {
  .planet-stats {
    grid-template-columns: 1fr;
  }
  
  .features-list {
    grid-template-columns: 1fr;
  }
  
  .planet-header {
    margin-bottom: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .planet-section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  .planet-name {
    font-size: 2.5rem;
  }
  
  .planet-type {
    font-size: 1rem;
  }
  
  .stat-card {
    padding: var(--spacing-sm);
  }
  
  .fun-fact-text {
    font-size: 1.1rem;
  }
}