/* ============================================
   Flight Price Monitor - Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ── CSS Custom Properties ── */
:root {
  /* Colors - Base */
  --bg-primary: #0a0a1a;
  --bg-secondary: #0f0f2a;
  --bg-tertiary: #141432;
  --bg-card: rgba(20, 20, 50, 0.6);
  --bg-card-hover: rgba(30, 30, 70, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-border: rgba(255, 255, 255, 0.08);

  /* Colors - Text */
  --text-primary: #e8e8f0;
  --text-secondary: #9898b8;
  --text-muted: #5a5a7a;
  --text-accent: #a78bfa;

  /* Colors - Accent Gradients */
  --gradient-purple: linear-gradient(135deg, #7c3aed, #a78bfa);
  --gradient-blue: linear-gradient(135deg, #3b82f6, #60a5fa);
  --gradient-cyan: linear-gradient(135deg, #06b6d4, #22d3ee);
  --gradient-emerald: linear-gradient(135deg, #10b981, #34d399);
  --gradient-rose: linear-gradient(135deg, #f43f5e, #fb7185);
  --gradient-amber: linear-gradient(135deg, #f59e0b, #fbbf24);
  --gradient-hero: linear-gradient(135deg, #7c3aed 0%, #3b82f6 50%, #06b6d4 100%);

  /* Colors - Solid Accents */
  --purple: #a78bfa;
  --blue: #60a5fa;
  --cyan: #22d3ee;
  --emerald: #34d399;
  --rose: #fb7185;
  --amber: #fbbf24;

  /* Colors - Price Coding */
  --price-cheap: #34d399;
  --price-cheap-bg: rgba(52, 211, 153, 0.12);
  --price-moderate: #fbbf24;
  --price-moderate-bg: rgba(251, 191, 36, 0.12);
  --price-expensive: #fb7185;
  --price-expensive-bg: rgba(251, 113, 133, 0.12);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.7rem;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.9rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.2rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-black: 900;

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-purple: 0 0 20px rgba(124, 58, 237, 0.3);
  --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse 600px 400px at 10% 20%, rgba(124, 58, 237, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 80% 60%, rgba(6, 182, 212, 0.06) 0%, transparent 70%),
    radial-gradient(ellipse 400px 300px at 50% 90%, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

a { color: var(--purple); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}
::-webkit-scrollbar-thumb {
  background: rgba(167, 139, 250, 0.3);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(167, 139, 250, 0.5);
}

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px rgba(124, 58, 237, 0.2); }
  50% { box-shadow: 0 0 20px rgba(124, 58, 237, 0.4); }
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(100%) scale(0.9); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(100%) scale(0.9); }
}

.animate-fadeIn { animation: fadeIn 0.5s ease forwards; }
.animate-slideUp { animation: slideUp 0.5s ease forwards; }

/* ── Layout ── */
.app-container {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--bg-glass-border);
  animation: slideDown 0.5s ease;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.logo-icon {
  font-size: var(--font-size-2xl);
  animation: float 3s ease-in-out infinite;
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.status-badge {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 8px rgba(52, 211, 153, 0.6);
  animation: pulse 2s ease-in-out infinite;
}

.status-dot.offline {
  background: var(--rose);
  box-shadow: 0 0 8px rgba(251, 113, 133, 0.6);
}

.last-update {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--gradient-purple);
  border-color: transparent;
  color: #fff;
  font-weight: var(--font-weight-semibold);
}

.btn-primary:hover {
  box-shadow: var(--shadow-glow-purple);
  border-color: transparent;
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn .icon-spin {
  animation: spinSlow 1s linear infinite;
}

/* ── Navigation Tabs ── */
.nav-tabs {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--bg-glass-border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-tab {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
  position: relative;
}

.nav-tab:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.nav-tab.active {
  color: #fff;
  background: var(--gradient-purple);
  box-shadow: var(--shadow-glow-purple);
}

.nav-tab .tab-icon {
  font-size: var(--font-size-md);
}

/* ── Tab Content ── */
.tab-content {
  flex: 1;
  padding: var(--space-xl) 0;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-pane.active {
  display: block;
}

/* ── Cards / Glassmorphism ── */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.card-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
}

.card-icon.purple { background: rgba(124, 58, 237, 0.15); }
.card-icon.blue { background: rgba(59, 130, 246, 0.15); }
.card-icon.cyan { background: rgba(6, 182, 212, 0.15); }
.card-icon.emerald { background: rgba(16, 185, 129, 0.15); }

/* ── Stats Cards Row ── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.stat-card {
  animation: slideUp 0.5s ease forwards;
  opacity: 0;
}

.stat-card:nth-child(1) { animation-delay: 0.05s; }
.stat-card:nth-child(2) { animation-delay: 0.1s; }
.stat-card:nth-child(3) { animation-delay: 0.15s; }
.stat-card:nth-child(4) { animation-delay: 0.2s; }

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
  color: var(--text-primary);
  margin: var(--space-sm) 0;
  letter-spacing: -0.03em;
  animation: countUp 0.6s ease forwards;
}

.stat-value.price {
  background: var(--gradient-emerald);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-change {
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.stat-change.up { color: var(--rose); }
.stat-change.down { color: var(--emerald); }

/* ── Route Cards ── */
.routes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}

.route-card {
  position: relative;
  overflow: hidden;
  animation: slideUp 0.5s ease forwards;
  opacity: 0;
}

.route-card:nth-child(1) { animation-delay: 0.1s; }
.route-card:nth-child(2) { animation-delay: 0.15s; }
.route-card:nth-child(3) { animation-delay: 0.2s; }
.route-card:nth-child(4) { animation-delay: 0.25s; }

.route-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.route-card:nth-child(1)::before { background: var(--gradient-purple); }
.route-card:nth-child(2)::before { background: var(--gradient-blue); }
.route-card:nth-child(3)::before { background: var(--gradient-cyan); }
.route-card:nth-child(4)::before { background: var(--gradient-emerald); }

.route-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.route-name .plane-icon {
  font-size: var(--font-size-md);
  opacity: 0.7;
}

.route-price {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-black);
  letter-spacing: -0.03em;
  margin: var(--space-sm) 0;
}

.route-price.cheap {
  color: var(--price-cheap);
  text-shadow: 0 0 30px rgba(52, 211, 153, 0.3);
}

.route-price.moderate {
  color: var(--price-moderate);
  text-shadow: 0 0 30px rgba(251, 191, 36, 0.3);
}

.route-price.expensive {
  color: var(--price-expensive);
  text-shadow: 0 0 30px rgba(251, 113, 133, 0.3);
}

.route-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.route-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.price-change {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.price-change.down {
  color: var(--price-cheap);
  background: var(--price-cheap-bg);
}

.price-change.up {
  color: var(--price-expensive);
  background: var(--price-expensive-bg);
}

/* ── Section Headers ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.section-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

/* ── Filter / Controls ── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.filter-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
}

.filter-select,
.filter-input {
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  outline: none;
  transition: border-color var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.filter-select {
  padding-right: var(--space-xl);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239898b8' viewBox='0 0 16 16'%3E%3Cpath d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.filter-select:focus,
.filter-input:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 2px rgba(167, 139, 250, 0.15);
}

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

/* ── Tables ── */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--bg-glass-border);
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.data-table thead {
  position: sticky;
  top: 0;
  z-index: 2;
}

.data-table th {
  padding: var(--space-md) var(--space-md);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--bg-glass-border);
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}

.data-table th:hover {
  color: var(--text-primary);
}

.data-table th.sorted {
  color: var(--purple);
}

.data-table th .sort-icon {
  margin-left: var(--space-xs);
  opacity: 0.4;
  transition: opacity var(--transition-fast);
}

.data-table th:hover .sort-icon,
.data-table th.sorted .sort-icon {
  opacity: 1;
}

.data-table td {
  padding: var(--space-md) var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-primary);
  white-space: nowrap;
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: rgba(167, 139, 250, 0.05);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ── Price Tags ── */
.price-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
}

.price-tag.cheap {
  color: var(--price-cheap);
  background: var(--price-cheap-bg);
}

.price-tag.moderate {
  color: var(--price-moderate);
  background: var(--price-moderate-bg);
}

.price-tag.expensive {
  color: var(--price-expensive);
  background: var(--price-expensive-bg);
}

/* ── Pagination ── */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) 0;
}

.page-btn {
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.page-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
}

.page-btn.active {
  background: var(--gradient-purple);
  border-color: transparent;
  color: #fff;
  font-weight: var(--font-weight-semibold);
}

.page-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.page-info {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin: 0 var(--space-sm);
}

/* ── Charts ── */
.chart-container {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  transition: all var(--transition-base);
}

.chart-container:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

.chart-title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.chart-wrapper {
  position: relative;
  width: 100%;
  height: 350px;
}

.chart-wrapper.small {
  height: 220px;
}

/* ── Loading Skeleton ── */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 25%,
    rgba(255, 255, 255, 0.05) 50%,
    var(--bg-tertiary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 14px;
  margin-bottom: var(--space-sm);
  border-radius: var(--radius-sm);
}

.skeleton-text.short { width: 40%; }
.skeleton-text.medium { width: 65%; }
.skeleton-text.long { width: 90%; }

.skeleton-heading {
  height: 28px;
  width: 50%;
  margin-bottom: var(--space-md);
}

.skeleton-price {
  height: 40px;
  width: 120px;
  margin: var(--space-sm) 0;
}

.skeleton-chart {
  height: 300px;
  width: 100%;
}

.skeleton-card {
  padding: var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
}

/* ── Loading Overlay ── */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 26, 0.7);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.spinner-ring {
  width: 48px;
  height: 48px;
  border: 3px solid var(--bg-glass-border);
  border-top-color: var(--purple);
  border-radius: 50%;
  animation: spinSlow 0.8s linear infinite;
}

.loading-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ── Empty State ── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-lg);
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--space-lg);
  opacity: 0.4;
}

.empty-state-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.empty-state-desc {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  max-width: 400px;
}

/* ── Toast Notifications ── */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-tertiary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 420px;
  animation: toastIn 0.4s ease forwards;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.toast.removing {
  animation: toastOut 0.3s ease forwards;
}

.toast-icon {
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.toast.success { border-left: 3px solid var(--emerald); }
.toast.error { border-left: 3px solid var(--rose); }
.toast.info { border-left: 3px solid var(--blue); }
.toast.warning { border-left: 3px solid var(--amber); }

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 26, 0.8);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1500;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-xl);
  width: 90%;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-spring);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--bg-glass-border);
}

.modal-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: var(--radius-md);
  background: var(--bg-glass);
  color: var(--text-secondary);
  font-size: var(--font-size-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

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

.modal-body .detail-row {
  display: flex;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.modal-body .detail-label {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.modal-body .detail-value {
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

/* ── Tooltip ── */
.tooltip {
  position: relative;
}

.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.9);
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-fast);
  z-index: 100;
}

.tooltip:hover::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}

/* ── Transfer Badge ── */
.transfer-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.transfer-badge.direct {
  background: rgba(52, 211, 153, 0.12);
  color: var(--emerald);
}

.transfer-badge.one-stop {
  background: rgba(251, 191, 36, 0.12);
  color: var(--amber);
}

.transfer-badge.multi-stop {
  background: rgba(251, 113, 133, 0.12);
  color: var(--rose);
}

/* ── Footer ── */
.app-footer {
  padding: var(--space-xl) 0;
  border-top: 1px solid var(--bg-glass-border);
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

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

.app-footer a:hover {
  color: var(--purple);
}

/* ── Responsive ── */
@media (max-width: 1200px) {
  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .routes-grid {
    grid-template-columns: 1fr;
  }

  .header-right {
    gap: var(--space-md);
  }
}

@media (max-width: 768px) {
  html { font-size: 14px; }

  .app-container {
    padding: 0 var(--space-md);
  }

  .app-header {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .header-left {
    flex-direction: column;
  }

  .header-right {
    flex-wrap: wrap;
    justify-content: center;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .filter-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .filter-group {
    width: 100%;
  }

  .filter-select,
  .filter-input {
    flex: 1;
  }

  .nav-tabs {
    gap: 2px;
  }

  .nav-tab {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
  }

  .chart-wrapper {
    height: 260px;
  }

  .chart-wrapper.small {
    height: 180px;
  }

  .toast-container {
    left: var(--space-md);
    right: var(--space-md);
  }

  .toast {
    min-width: unset;
    max-width: unset;
  }
}

@media (max-width: 480px) {
  .stats-row {
    grid-template-columns: 1fr;
  }

  .route-price {
    font-size: var(--font-size-2xl);
  }

  .pagination {
    flex-wrap: wrap;
  }
}

/* ── AI Chat ── */
.ai-chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 260px);
  min-height: 500px;
  max-height: 800px;
}

.ai-chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.ai-message {
  display: flex;
  max-width: 85%;
}

.ai-message-user {
  align-self: flex-end;
}

.ai-message-system {
  align-self: flex-start;
}

.ai-message-bubble {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  line-height: 1.7;
}

.ai-message-user .ai-message-bubble {
  background: linear-gradient(135deg, var(--purple), #6366f1);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.ai-message-system .ai-message-bubble {
  background: var(--bg-tertiary);
  border: 1px solid var(--bg-glass-border);
  border-bottom-left-radius: 4px;
  color: var(--text-primary);
}

.ai-message-system .ai-message-bubble p {
  margin-bottom: var(--space-sm);
}

.ai-message-system .ai-message-bubble ul {
  margin: var(--space-sm) 0;
  padding-left: var(--space-lg);
}

.ai-message-system .ai-message-bubble li {
  margin: 4px 0;
  color: var(--text-secondary);
}

.ai-message-system .ai-message-bubble strong {
  color: var(--text-accent);
}

.ai-message-bubble table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-sm) 0;
  font-size: var(--font-size-xs);
}

.ai-message-bubble th,
.ai-message-bubble td {
  padding: 6px 10px;
  border: 1px solid var(--bg-glass-border);
  text-align: left;
}

.ai-message-bubble th {
  background: rgba(167, 139, 250, 0.1);
  font-weight: var(--font-weight-semibold);
}

.ai-message-bubble code {
  background: rgba(167, 139, 250, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.ai-chat-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0 var(--space-md) var(--space-sm);
}

.ai-suggestion-btn {
  padding: 6px 14px;
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-full);
  background: var(--bg-glass);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.ai-suggestion-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-accent);
  border-color: var(--purple);
}

.ai-chat-input {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-top: 1px solid var(--bg-glass-border);
}

.ai-chat-input textarea {
  flex: 1;
  background: var(--bg-tertiary);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: inherit;
  font-size: var(--font-size-sm);
  padding: var(--space-md);
  resize: none;
  outline: none;
  transition: border-color var(--transition-fast);
}

.ai-chat-input textarea:focus {
  border-color: var(--purple);
}

.ai-chat-input textarea::placeholder {
  color: var(--text-muted);
}

.ai-chat-input .btn {
  padding: var(--space-sm) var(--space-lg);
  align-self: flex-end;
  white-space: nowrap;
}

.ai-typing-indicator {
  display: flex;
  gap: 4px;
  padding: var(--space-sm) 0;
}

.ai-typing-indicator span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: aiTyping 1.4s infinite ease-in-out both;
}

.ai-typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.ai-typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
.ai-typing-indicator span:nth-child(3) { animation-delay: 0s; }

@keyframes aiTyping {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}