:root {
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-dark: #065f46;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-dark: #991b1b;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-hover: #f1f5f9;
  --border: #e2e8f0;
  --border-focus: #a5b4fc;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --transition: 0.2s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding-bottom: 100px;
}

.app-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  padding: 28px 24px 20px;
  color: white;
}

.header-content {
  max-width: 900px;
  margin: 0 auto;
}

.app-title {
  font-size: 1.75rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.02em;
}

.title-icon {
  font-size: 1.5rem;
}

.app-subtitle {
  margin-top: 4px;
  font-size: 0.9rem;
  opacity: 0.85;
  font-weight: 400;
}

.tab-bar {
  display: flex;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow);
}

.tab-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 8px 10px;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition);
  border-bottom: 3px solid transparent;
  font-weight: 500;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-btn:hover:not(.active) {
  color: var(--text-secondary);
}

.tab-icon {
  font-size: 1.25rem;
}

.tab-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.main-content {
  padding: 20px 16px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--bg-hover);
  padding: 4px 10px;
  border-radius: 20px;
}

.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-icon {
  background: transparent;
  border: 1px solid var(--border);
  width: 34px;
  height: 34px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: background var(--transition);
}

.btn-icon:hover {
  background: var(--bg-hover);
}

.btn-icon.btn-danger:hover {
  background: var(--danger-bg);
  border-color: var(--danger);
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 2px dashed var(--border);
}

.empty-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 12px;
}

.empty-state h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.empty-state p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 320px;
  margin: 0 auto;
  line-height: 1.5;
}

.loading-state {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Map Section */
.map-section {
  /* container */
}

.map-container {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.map-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: repeat(12, 1fr);
  aspect-ratio: 1.5;
  background: linear-gradient(135deg, var(--bg-hover), var(--bg));
  position: relative;
  gap: 1px;
}

.map-cell {
  border: 1px solid var(--border);
  opacity: 0.3;
}

.map-stop-pin {
  position: absolute;
  top: calc(var(--pin-row) / 12 * 100%);
  left: calc(var(--pin-col) / 12 * 100%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--primary);
  background: var(--bg-card);
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition), box-shadow var(--transition);
  z-index: 5;
}

.map-stop-pin:hover {
  transform: scale(1.25);
  box-shadow: var(--shadow-md);
  z-index: 10;
}

.map-stop-pin.favorite {
  border-color: var(--warning);
}

.map-stop-pin.highlighted {
  transform: scale(1.3);
  box-shadow: 0 0 0 4px var(--primary-light);
}

.map-route-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}

.legend-route-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.legend-route-chip.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.legend-route-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--route-color);
  display: inline-block;
}

/* Routes Section */
.route-form {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 20px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
}

.form-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.form-group {
  margin-bottom: 14px;
  flex: 1;
}

.form-row {
  display: flex;
  gap: 12px;
}

.form-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.form-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-color {
  height: 42px;
  padding: 4px;
  cursor: pointer;
}

.form-actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.routes-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.route-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.route-card:hover {
  box-shadow: var(--shadow-md);
}

.route-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
}

.route-color-indicator {
  width: 6px;
  height: 40px;
  border-radius: 3px;
  background: var(--route-color);
  flex-shrink: 0;
}

.route-card-info {
  flex: 1;
  min-width: 0;
}

.route-card-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}

.route-card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.route-card-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.route-stops-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 16px 14px;
}

.stop-chip {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(79, 70, 229, 0.08);
  padding: 3px 10px;
  border-radius: 14px;
}

/* Favorites Section */
.add-favorite-panel {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 16px;
  margin-bottom: 16px;
}

.panel-title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text);
}

.panel-empty {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.available-stops-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 8px;
}

.available-stop-btn {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  cursor: pointer;
  text-align: left;
  transition: all var(--transition);
}

.available-stop-btn:hover {
  border-color: var(--primary);
  background: rgba(79, 70, 229, 0.04);
}

.available-stop-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.available-stop-route {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.favorites-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.favorite-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: box-shadow var(--transition);
}

.favorite-card:hover {
  box-shadow: var(--shadow-md);
}

.favorite-card-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.favorite-star {
  font-size: 1.25rem;
}

.favorite-name {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
}

.favorite-route {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Performance Section */
.performance-section {
  /* container */
}

.performance-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.performance-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 18px 20px;
  transition: box-shadow var(--transition);
}

.performance-card:hover {
  box-shadow: var(--shadow-md);
}

.performance-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
  flex-wrap: wrap;
}

.performance-route-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.performance-route-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.performance-range-selector {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 3px;
}

.range-chip {
  border: none;
  background: transparent;
  padding: 5px 12px;
  border-radius: var(--radius-xs);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
}

.range-chip.active {
  background: var(--primary);
  color: white;
  box-shadow: var(--shadow);
}

.range-chip:hover:not(.active) {
  color: var(--text);
  background: var(--bg-hover);
}

.performance-summary {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
}

.summary-item {
  flex: 1;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.summary-item.on-time {
  background: var(--success-bg);
}

.summary-item.delayed {
  background: var(--danger-bg);
}

.summary-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.summary-item.on-time .summary-label {
  color: var(--success-dark);
}

.summary-item.delayed .summary-label {
  color: var(--danger-dark);
}

.summary-value {
  font-size: 1.35rem;
  font-weight: 800;
}

.summary-item.on-time .summary-value {
  color: var(--success);
}

.summary-item.delayed .summary-value {
  color: var(--danger);
}

.summary-subvalue {
  font-size: 0.78rem;
  font-weight: 600;
}

.summary-item.on-time .summary-subvalue {
  color: var(--success-dark);
}

.summary-item.delayed .summary-subvalue {
  color: var(--danger-dark);
}

.performance-bar {
  margin-bottom: 12px;
}

.performance-bar-track {
  display: flex;
  height: 12px;
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-hover);
  margin-bottom: 8px;
}

.performance-bar-fill {
  height: 100%;
  transition: width 0.4s ease;
}

.performance-bar-fill.on-time {
  background: var(--success);
}

.performance-bar-fill.delayed {
  background: var(--danger);
}

.performance-bar-legend {
  display: flex;
  gap: 16px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.performance-bar-legend span {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.legend-dot.on-time {
  background: var(--success);
}

.legend-dot.delayed {
  background: var(--danger);
}

.performance-footnote {
  font-size: 0.72rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: 4px;
}

@media (max-width: 600px) {
  .app-header {
    padding: 20px 16px 16px;
  }

  .app-title {
    font-size: 1.4rem;
  }

  .main-content {
    padding: 16px 12px;
  }

  .performance-card-header {
    flex-direction: column;
  }

  .performance-summary {
    flex-direction: column;
    gap: 10px;
  }

  .form-row {
    flex-direction: column;
    gap: 0;
  }

  .available-stops-grid {
    grid-template-columns: 1fr;
  }
}