/* ============================================================
   LANDING PAGE STYLES — Eyes on the Sky
   ============================================================ */

/* ── Hero Section ─────────────────────────────────────────── */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg canvas {
  width: 100%;
  height: 100%;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 30%, var(--bg-primary) 80%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 var(--space-xl);
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-xl);
  background: rgba(124, 58, 237, 0.15);
  border: 1px solid rgba(124, 58, 237, 0.25);
  color: var(--accent-purple);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xl);
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: var(--space-lg);
  letter-spacing: -0.02em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.hero-logo-img {
  width: clamp(60px, 10vw, 100px);
  height: clamp(60px, 10vw, 100px);
  filter: drop-shadow(0 0 30px rgba(124, 58, 237, 0.3));
  animation: float 3s ease-in-out infinite;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #c084fc, #7c3aed, #3b82f6, #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 4s ease-in-out infinite;
}

/* Brand text shimmer effect */
.brand-text {
  position: relative;
  display: inline-block;
}

.brand-text::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  animation: brandShimmer 5s ease-in-out infinite;
}

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

@keyframes brandShimmer {
  0%, 80% { left: -100%; }
  100% { left: 200%; }
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
  font-weight: 400;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xl);
  margin-top: var(--space-3xl);
}

.hero-stat {
  text-align: center;
}

.hero-stat .number {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat .label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

.hero-scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: float 2s ease-in-out infinite;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--accent-purple), transparent);
}

/* ── Celestial Cards Grid ─────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-lg);
}

.celestial-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-smooth);
  cursor: pointer;
  position: relative;
}

.celestial-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

.celestial-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.card-visual {
  position: relative;
  height: 180px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.card-visual canvas {
  position: absolute;
  inset: 0;
}

.card-planet-render {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-glow {
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.3;
}

.card-body {
  padding: var(--space-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-sm);
}

.card-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.card-stat {
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
}

.card-stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-stat-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 0.15rem;
}

.card-fun-fact {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: rgba(124, 58, 237, 0.08);
  border-left: 3px solid var(--accent-purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Category Filter Tabs ─────────────────────────────────── */
.filter-tabs {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.filter-tab {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-xl);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.03);
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.filter-tab:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}

.filter-tab.active {
  color: var(--accent-purple);
  background: rgba(124, 58, 237, 0.12);
  border-color: rgba(124, 58, 237, 0.3);
}

/* ── APOD Section ─────────────────────────────────────────── */
.apod-section {
  background: var(--bg-secondary);
}

.apod-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.apod-image-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--bg-tertiary);
}

.apod-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.apod-image-wrap .apod-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 4rem;
}

.apod-date {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-xl);
  background: rgba(124, 58, 237, 0.15);
  color: var(--accent-purple);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.apod-title {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.apod-explanation {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.95rem;
}

/* ── NEO Section ──────────────────────────────────────────── */
.neo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.neo-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-smooth);
}

.neo-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.neo-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
}

.neo-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
}

.neo-hazard {
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-xl);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.neo-hazard.safe {
  background: rgba(16,185,129,0.15);
  color: var(--accent-green);
}

.neo-hazard.hazardous {
  background: rgba(239,68,68,0.15);
  color: #ef4444;
}

.neo-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-sm);
}

.neo-stat {
  text-align: center;
  padding: var(--space-sm);
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-sm);
}

.neo-stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent-cyan);
}

.neo-stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

/* ── Timeline Section ─────────────────────────────────────── */
.timeline-section {
  background: var(--bg-secondary);
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent-purple), var(--accent-blue), var(--accent-cyan));
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  padding: var(--space-lg) 0;
  display: flex;
  align-items: center;
}

.timeline-item:nth-child(odd) {
  justify-content: flex-start;
  padding-right: calc(50% + 30px);
  text-align: right;
}

.timeline-item:nth-child(even) {
  justify-content: flex-end;
  padding-left: calc(50% + 30px);
}

.timeline-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 2px solid var(--accent-purple);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  z-index: 1;
  transition: all var(--transition-fast);
}

.timeline-item:hover .timeline-dot {
  transform: translateX(-50%) scale(1.2);
  box-shadow: 0 0 20px rgba(124, 58, 237, 0.4);
}

.timeline-content {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  transition: all var(--transition-smooth);
}

.timeline-item:hover .timeline-content {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.timeline-year {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-purple);
  font-size: 0.9rem;
}

.timeline-event {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

/* ── Quiz Section ─────────────────────────────────────────── */
.quiz-container {
  max-width: 700px;
  margin: 0 auto;
}

.quiz-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}

.quiz-progress {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.quiz-progress-bar {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.05);
  border-radius: 2px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 2px;
  transition: width var(--transition-smooth);
}

.quiz-progress-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.quiz-question {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: var(--space-xl);
  line-height: 1.4;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.quiz-option {
  padding: var(--space-md) var(--space-lg);
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 1rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.quiz-option .option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.quiz-option:hover {
  background: rgba(124, 58, 237, 0.08);
  border-color: rgba(124, 58, 237, 0.3);
}

.quiz-option:hover .option-letter {
  background: rgba(124, 58, 237, 0.2);
  border-color: var(--accent-purple);
}

.quiz-option.correct {
  background: rgba(16, 185, 129, 0.12);
  border-color: var(--accent-green);
}

.quiz-option.correct .option-letter {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: white;
}

.quiz-option.wrong {
  background: rgba(239, 68, 68, 0.12);
  border-color: #ef4444;
}

.quiz-option.wrong .option-letter {
  background: #ef4444;
  border-color: #ef4444;
  color: white;
}

.quiz-option.disabled {
  pointer-events: none;
}

.quiz-explanation {
  margin-top: var(--space-lg);
  padding: var(--space-md) var(--space-lg);
  background: rgba(124, 58, 237, 0.08);
  border-left: 3px solid var(--accent-purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  display: none;
}

.quiz-explanation.visible {
  display: block;
  animation: fadeIn 0.3s ease;
}

.quiz-next-btn {
  margin-top: var(--space-xl);
  display: none;
}

.quiz-next-btn.visible {
  display: inline-flex;
}

.quiz-result {
  text-align: center;
  padding: var(--space-2xl);
}

.quiz-score {
  font-size: 4rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.quiz-score-text {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: var(--space-sm);
}

/* ── Light Speed Calculator ───────────────────────────────── */
.calculator-section {
  background: var(--bg-secondary);
}

.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.calc-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-smooth);
}

.calc-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  transform: translateY(-3px);
}

.calc-target {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.calc-distance {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.calc-time {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  background: var(--gradient-cool);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.calc-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── ISS Tracker ──────────────────────────────────────────── */
.iss-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.iss-map {
  aspect-ratio: 16/9;
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  position: relative;
}

.iss-map canvas {
  width: 100%;
  height: 100%;
}

.iss-info .glass-card {
  margin-bottom: var(--space-md);
}

.iss-coord {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.iss-coord-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.iss-live-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-xl);
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.iss-live-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #ef4444;
  animation: pulse 1.5s infinite;
}

/* ── Planet Comparison ────────────────────────────────────── */
.comparison-container {
  max-width: 900px;
  margin: 0 auto;
}

.comparison-visual {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: var(--space-xl);
  padding: var(--space-3xl) 0;
  min-height: 350px;
}

.comparison-planet {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  transition: all var(--transition-smooth);
}

.comparison-sphere {
  border-radius: 50%;
  transition: all var(--transition-smooth);
  box-shadow: 0 0 30px rgba(255,255,255,0.1);
}

.comparison-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
}

.comparison-selectors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
}

.comparison-select {
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237c3aed' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

.comparison-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.comparison-table {
  width: 100%;
  margin-top: var(--space-2xl);
  border-collapse: collapse;
}

.comparison-table th {
  text-align: center;
  padding: var(--space-md);
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--border-subtle);
}

.comparison-table td {
  text-align: center;
  padding: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(255,255,255,0.02);
}

.comparison-table tr:hover td {
  background: rgba(255,255,255,0.02);
}

/* ── Animations ───────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

.animate-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 1024px) {
  .apod-container {
    grid-template-columns: 1fr;
  }

  .iss-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .hero-stats {
    gap: var(--space-xl);
  }

  .hero-stat .number {
    font-size: 1.4rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .timeline::before {
    left: 20px;
  }

  .timeline-item:nth-child(odd),
  .timeline-item:nth-child(even) {
    padding-left: 60px;
    padding-right: 0;
    justify-content: flex-start;
    text-align: left;
  }

  .timeline-dot {
    left: 20px;
  }

  .neo-grid {
    grid-template-columns: 1fr;
  }

  .comparison-selectors {
    grid-template-columns: 1fr;
  }

  .comparison-visual {
    min-height: 250px;
  }

  .calculator-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .hero-stats {
    flex-direction: column;
    gap: var(--space-md);
  }

  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .filter-tabs {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--space-sm);
  }

  .filter-tab {
    white-space: nowrap;
    flex-shrink: 0;
  }
}