:root {
  --bg-color: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  --highlight-bg: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(147, 51, 234, 0.2));
  --highlight-border: rgba(147, 51, 234, 0.3);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Background glow effects */
.background-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  overflow: hidden;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.5;
}

.glow-1 {
  top: -10%;
  left: -10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(59,130,246,0.3) 0%, rgba(15,23,42,0) 70%);
}

.glow-2 {
  bottom: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(147,51,234,0.2) 0%, rgba(15,23,42,0) 70%);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(to right, #60a5fa, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  box-shadow: var(--glass-shadow);
  padding: 1.5rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: flex-end;
  margin-bottom: 2.5rem;
}

.control-group {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

input[type="date"],
select {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s ease;
  color-scheme: dark;
  appearance: none;
  -webkit-appearance: none;
}

input[type="date"]:focus,
select:focus {
  border-color: var(--accent-color);
}

.primary-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  font-family: inherit;
}

.primary-btn:hover {
  background: var(--accent-hover);
}

.primary-btn:active {
  transform: translateY(2px);
}

.primary-btn:disabled {
  background: #475569;
  cursor: not-allowed;
  transform: none;
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  font-family: inherit;
}

.secondary-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.sync-panel {
  margin-bottom: 2rem;
  padding: 1.5rem;
  text-align: center;
}

.sync-panel.hidden {
  display: none;
}

.sync-panel h3 {
  margin-bottom: 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--accent-color);
  width: 0%;
  transition: width 0.3s ease;
}

.sync-panel p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.results-grid.hidden {
  display: none;
}

.stat-card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.stat-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.stat-card.highlight {
  grid-column: 1 / -1;
  background: var(--highlight-bg);
  border-color: var(--highlight-border);
  text-align: center;
  padding: 2.5rem;
}

.stat-card.highlight .amount {
  font-size: 3rem;
  color: #fff;
  text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.stat-card h3 {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.amount {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Spinner */
.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem 0;
}

.spinner-container.hidden {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(59, 130, 246, 0.2);
  border-left-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.error-panel {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  text-align: center;
}

.error-panel.hidden {
  display: none;
}

/* Vehicles Panel */
.vehicles-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.vehicles-header h3 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.vehicles-actions {
  display: flex;
  gap: 1rem;
}

.text-btn {
  background: none;
  border: none;
  color: var(--accent-color);
  cursor: pointer;
  font-size: 0.9rem;
}

.text-btn:hover {
  text-decoration: underline;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.8rem;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(15, 23, 42, 0.5);
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: background 0.2s;
}

.checkbox-item:hover {
  background: rgba(30, 41, 59, 0.8);
}

.checkbox-item input {
  cursor: pointer;
}

/* Per Vehicle Grid */
.per-vehicle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.vehicle-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.vehicle-card h3 {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--glass-border);
  color: var(--accent-color);
}

.v-stat-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.v-stat-row.total {
  font-weight: bold;
  border-top: 1px solid var(--glass-border);
  padding-top: 0.5rem;
  margin-top: 0.5rem;
}

.v-stat-row.salary {
  color: #fbbf24;
  font-weight: bold;
}

/* =========================================
   Mobile Responsiveness
   ========================================= */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
    margin: 1rem auto;
  }

  h1 {
    font-size: 1.8rem;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
    gap: 1rem;
    padding: 1rem;
  }

  .control-group {
    width: 100%;
  }

  .control-group select {
    width: 100%;
    padding: 0.8rem;
  }

  .primary-btn, .secondary-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
  }

  .vehicles-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }

  .vehicles-actions {
    width: 100%;
    justify-content: space-between;
  }

  .checkbox-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.5rem;
  }

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

  .per-vehicle-grid {
    grid-template-columns: 1fr;
  }
}