/* === Base === */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f3460;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0b0;
  --accent: #e94560;
  --color-euro95: #4fc3f7;
  --color-diesel: #ffb74d;
  --color-lpg: #81c784;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
  font-size: 16px;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === Header === */
header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

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

/* === Main === */
main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 1rem 2rem;
  position: relative;
}

/* === Loader === */
.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 400px;
}

.loader.hidden {
  display: none;
}

.loader-content {
  text-align: center;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--bg-card);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

#loader-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-family: var(--font-mono);
}

/* === Price cards === */
.price-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.price-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
  border-top: 3px solid transparent;
  transition: transform 0.15s ease;
}

.price-card:hover {
  transform: translateY(-2px);
}

.price-card.euro95 {
  border-top-color: var(--color-euro95);
}

.price-card.diesel {
  border-top-color: var(--color-diesel);
}

.price-card.lpg {
  border-top-color: var(--color-lpg);
}

.price-card h3 {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.price-card .price {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.price-card.euro95 .price {
  color: var(--color-euro95);
}

.price-card.diesel .price {
  color: var(--color-diesel);
}

.price-card.lpg .price {
  color: var(--color-lpg);
}

.price-card .unit {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.price-card .price-date {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.4rem;
  font-style: italic;
}

/* === Statistics === */
.stats-section {
  margin-bottom: 1.5rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.stats-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  border-left: 3px solid transparent;
}

.stats-card.euro95 {
  border-left-color: var(--color-euro95);
}

.stats-card.diesel {
  border-left-color: var(--color-diesel);
}

.stats-card.lpg {
  border-left-color: var(--color-lpg);
}

.stats-card h4 {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
}

.stats-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 0.35rem;
}

.stats-row.period {
  opacity: 0.85;
}

.stats-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  min-width: 110px;
}

.stats-value {
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.stats-date {
  font-size: 0.7rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* === Fuel toggles === */
.fuel-toggles {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
  user-select: none;
}

.toggle input[type='checkbox'] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.toggle.euro95 span {
  color: var(--color-euro95);
}

.toggle.diesel span {
  color: var(--color-diesel);
}

.toggle.lpg span {
  color: var(--color-lpg);
}

/* === Chart containers === */
.chart-container {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 1.5rem 1rem 1rem;
  margin-bottom: 0.75rem;
}

.navigator-container {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 1rem;
}

#main-chart,
#navigator-chart {
  width: 100%;
}

/* SVG styles for D3 */
.axis text {
  fill: var(--text-secondary);
  font-size: 11px;
}

.axis line,
.axis path {
  stroke: #2a2a4a;
}

.grid line {
  stroke: #2a2a4a;
  stroke-opacity: 0.5;
}

.grid path {
  stroke: none;
}

.line-euro95 {
  stroke: var(--color-euro95);
}

.line-diesel {
  stroke: var(--color-diesel);
}

.line-lpg {
  stroke: var(--color-lpg);
}

.brush .selection {
  fill: var(--accent);
  fill-opacity: 0.2;
  stroke: var(--accent);
  stroke-opacity: 0.6;
}

.tooltip {
  position: absolute;
  background: var(--bg-card);
  color: var(--text-primary);
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.tooltip.visible {
  opacity: 1;
}

/* === Hidden utility === */
.hidden {
  display: none !important;
}

/* === Footer === */
footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* === Responsive === */
@media (max-width: 640px) {
  .price-cards {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 1.4rem;
  }

  .price-card .price {
    font-size: 1.6rem;
  }

  .fuel-toggles {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }

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