/* ==========================================================================
   Navigation Bar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11, 14, 20, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-md) 0;
  transition: all var(--transition-normal);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-brand i {
  color: var(--accent-primary);
  font-size: 1.8rem;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  padding: var(--spacing-xs) 0;
  position: relative;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text-primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-normal);
  border-radius: 2px;
}

.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

@media (max-width: 768px) {
  .nav-links {
    display: none; /* Add a hamburger menu for mobile later */
  }
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 6rem 0 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.1) 0%, transparent 70%);
  z-index: -1;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* ==========================================================================
   Flight Board Component
   ========================================================================== */
.flight-board {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.board-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  gap: var(--spacing-md);
}

.selector-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.airport-select {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 0.6rem 2.5rem 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 1rem;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394A3B8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem top 50%;
  background-size: 0.65rem auto;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.airport-select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}

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

.date-filters {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: 0.25rem;
  border: 1px solid var(--border-color);
}

.date-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.date-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.tabs-container {
  display: flex;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 1rem 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast);
}

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

.tab-btn.active {
  color: var(--accent-secondary);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent-gradient);
  border-radius: 3px 3px 0 0;
}

.flights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.flight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.flight-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.flight-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: rgba(139, 92, 246, 0.3);
}

.flight-card:hover::before {
  opacity: 1;
}

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

.flight-number {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.airline-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.flight-route {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-tertiary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.route-point {
  text-align: center;
}

.route-code {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.route-city {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.2rem;
}

.route-arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
}

.flight-details {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.detail-group {
  display: flex;
  flex-direction: column;
}

.detail-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.detail-value {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.time-value {
  font-size: 1.4rem;
  color: var(--accent-secondary);
}

/* Status Badges */
.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.status-indicator {
  width: 6px;
  height: 6px;
  border-radius: 50%;
}

.status-ontime {
  background: var(--status-success-bg);
  color: var(--status-success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}
.status-ontime .status-indicator { background: var(--status-success); }

.status-delayed {
  background: var(--status-warning-bg);
  color: var(--status-warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}
.status-delayed .status-indicator { background: var(--status-warning); }

.status-cancelled {
  background: var(--status-error-bg);
  color: var(--status-error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}
.status-cancelled .status-indicator { background: var(--status-error); }

.status-boarding {
  background: var(--status-info-bg);
  color: var(--status-info);
  border: 1px solid rgba(59, 130, 246, 0.2);
  animation: pulse-glow 2s infinite;
}
.status-boarding .status-indicator { background: var(--status-info); }

.status-scheduled {
  background: var(--status-neutral-bg);
  color: var(--text-secondary);
  border: 1px solid rgba(100, 116, 139, 0.2);
}
.status-scheduled .status-indicator { background: var(--text-secondary); }

.status-departed, .status-arrived {
  background: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}
.status-departed .status-indicator, .status-arrived .status-indicator { background: var(--text-muted); }

/* Past Flight styling */
.flight-card.is-past {
  opacity: 0.6;
}
.flight-card.is-past:hover {
  opacity: 0.9;
}

/* Live indicator */
.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(239, 68, 68, 0.1);
  color: var(--status-error);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.live-dot {
  width: 8px;
  height: 8px;
  background: var(--status-error);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
  100% { opacity: 1; transform: scale(1); }
}

/* Empty state */
.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
}

.empty-state i {
  font-size: 3rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-md);
}

.empty-state h3 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--text-secondary);
}

/* Footer */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-col h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-size: 1.1rem;
}

.footer-col p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-secondary);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
}