/* === Theme variables === */
:root {
  --bg: #000000;
  --surface: #111111;
  --surface-hover: #1a1a1a;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --accent: #38bdf8;
  --accent-dim: #0ea5e9;
  --border: #222222;
  --pb95: #22c55e;
  --pb98: #3b82f6;
  --on: #f59e0b;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-hover: #f1f5f9;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #0ea5e9;
  --accent-dim: #0284c7;
  --border: #e2e8f0;
  --pb95: #16a34a;
  --pb98: #2563eb;
  --on: #d97706;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: light) {
  [data-theme="auto"] {
    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    --text: #0f172a;
    --text-muted: #64748b;
    --accent: #0ea5e9;
    --accent-dim: #0284c7;
    --border: #e2e8f0;
    --pb95: #16a34a;
    --pb98: #2563eb;
    --on: #d97706;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  transition: background 0.3s, color 0.3s;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  width: 100%;
  max-width: 720px;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.8125rem;
  text-align: left;
  width: 100%;
  margin-top: -0.5rem;
}

/* Theme toggle */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.theme-toggle:hover {
  color: var(--text);
  background: var(--surface-hover);
}

.theme-icon { display: none; }
[data-theme="dark"] .theme-icon--dark { display: block; }
[data-theme="light"] .theme-icon--light { display: block; }
[data-theme="auto"] .theme-icon--auto { display: block; }

@media (prefers-color-scheme: dark) {
  [data-theme="auto"] .theme-icon--auto { display: block; }
}
@media (prefers-color-scheme: light) {
  [data-theme="auto"] .theme-icon--auto { display: block; }
}

/* Carousel */
.carousel {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  position: relative;
}

.carousel-track {
  display: flex;
  gap: 0.75rem;
  overflow: hidden;
  flex: 1;
  justify-content: center;
  align-items: stretch;
  min-height: 230px;
}

.carousel-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, transform 0.2s;
  flex-shrink: 0;
  z-index: 2;
  line-height: 1;
}

.carousel-btn:hover {
  background: var(--surface-hover);
  transform: scale(1.1);
}

.carousel-btn:disabled {
  opacity: 0.3;
  cursor: default;
  transform: none;
}

/* Price card */
.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  min-width: 190px;
  max-width: 220px;
  flex: 1;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
}

.price-card--active {
  border-color: var(--accent);
  box-shadow: var(--shadow), 0 0 16px rgba(56, 189, 248, 0.12);
}

.price-card--inactive {
  opacity: 0.55;
  cursor: pointer;
  transform: scale(0.92);
}

.price-card--inactive:hover {
  opacity: 0.75;
}

.price-card--unknown {
  opacity: 0.4;
  border-style: dashed;
}

.price-card__date {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.price-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

.price-row:last-of-type {
  border-bottom: none;
}

.price-label {
  font-weight: 600;
  font-size: 0.875rem;
}

.price-label--pb95 { color: var(--pb95); }
.price-label--pb98 { color: var(--pb98); }
.price-label--on { color: var(--on); }

.price-value {
  font-size: 1.125rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.price-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-left: 0.25rem;
}

.price-change {
  font-size: 0.7rem;
  margin-left: 0.375rem;
  font-weight: 600;
}

.price-change--up { color: #ef4444; }
.price-change--down { color: #22c55e; }
.price-change--same { color: var(--text-muted); }

.price-card__source {
  margin-top: auto;
  padding-top: 0.625rem;
  text-align: center;
}

.price-card__source a {
  font-size: 0.6875rem;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.price-card__source a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.price-card__unknown {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  flex: 1;
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.875rem;
  padding: 1rem 0;
}

.price-card__unknown-icon {
  font-size: 2rem;
  opacity: 0.4;
}

/* Chart toggle */
.chart-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.chart-toggle:hover {
  color: var(--text);
  background: var(--surface-hover);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
}

.modal-overlay[hidden] { display: none; }

.modal-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  overflow: auto;
  box-shadow: 0 8px 48px rgba(0, 0, 0, 0.4);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 1.125rem;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s;
}

.modal-close:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.modal-body {
  padding: 1.5rem;
}

.modal-body canvas {
  width: 100% !important;
  height: auto !important;
  min-height: 300px;
}

/* Footer */
.app-footer {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.6875rem;
  margin-top: 0.5rem;
}

.staleness-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.staleness-dot--fresh { background: #22c55e; }
.staleness-dot--stale { background: #f59e0b; }
.staleness-dot--old { background: #ef4444; }

/* Loading */
.loading {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  gap: 1rem;
  z-index: 100;
  transition: opacity 0.3s;
}

.loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Error */
.error {
  text-align: center;
  color: #ef4444;
}

.error button {
  margin-top: 1rem;
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-weight: 600;
}

.no-data {
  color: var(--text-muted);
  text-align: center;
  padding: 2rem;
  font-style: italic;
}

/* Skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--surface) 25%, var(--surface-hover) 50%, var(--surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius);
}

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

.skeleton-card {
  width: 190px;
  height: 230px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

/* Responsive — mobile: 1 card */
@media (max-width: 600px) {
  h1 { font-size: 1.25rem; }

  .carousel-track {
    min-height: 210px;
  }

  .price-card {
    min-width: 70%;
    max-width: 85%;
  }

  .price-card--inactive {
    display: none;
  }

  .carousel-btn {
    width: 32px;
    height: 32px;
    font-size: 1.25rem;
  }

  .modal-body canvas {
    min-height: 200px;
  }
}