:root {
  --color-text: #1a1a1a;
  --color-text-muted: #555;
  --color-text-placeholder: #888;
  --color-bg: #f5f5f5;
  --color-surface: #fff;
  --color-border: #ccc;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-added: #16a34a;
  --color-added-hover: #15803d;
  --color-btn-dark: #1a1a1a;
  --color-btn-dark-hover: #333;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-hover: rgba(0, 0, 0, 0.12);
  --color-shimmer-from: #e5e7eb;
  --color-shimmer-via: #f3f4f6;
  --color-btn-text: #fff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #e5e7eb;
    --color-text-muted: #9ca3af;
    --color-text-placeholder: #6b7280;
    --color-bg: #111827;
    --color-surface: #1f2937;
    --color-border: #374151;
    --color-accent: #60a5fa;
    --color-accent-hover: #3b82f6;
    --color-added: #22c55e;
    --color-added-hover: #16a34a;
    --color-btn-dark: #e5e7eb;
    --color-btn-dark-hover: #d1d5db;
    --color-shadow: rgba(0, 0, 0, 0.3);
    --color-shadow-hover: rgba(0, 0, 0, 0.4);
    --color-shimmer-from: #1f2937;
    --color-shimmer-via: #374151;
    --color-btn-text: #fff;
  }
}

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

html {
  overflow-y: scroll;
  scrollbar-color: var(--color-border) transparent;
}

body {
  font-family:
    "Jost",
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

input,
button {
  font-family: inherit;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background-color: var(--color-accent);
  color: var(--color-btn-text);
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  z-index: 100;
}

.skip-link:focus {
  top: 1rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 1.75rem;
}

.cart-count {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* Controls */

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background-color: var(--color-surface);
  color: var(--color-text);
}

.search-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: -1px;
  border-color: transparent;
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-add-product {
  background-color: var(--color-btn-dark);
  color: var(--color-bg);
  align-self: flex-start;
  border: 1px solid transparent;
}

.btn-add-product:hover {
  background-color: var(--color-btn-dark-hover);
}

.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-cart {
  width: 100%;
  background-color: var(--color-accent);
  color: var(--color-btn-text);
}

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

/* Product Grid */

.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

/* Product Card */

.product-card {
  background-color: var(--color-surface);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 1px 3px var(--color-shadow);
  transition:
    box-shadow 0.2s,
    opacity 0.3s,
    transform 0.3s;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  box-shadow: 0 4px 12px var(--color-shadow-hover);
}

.product-card__image-wrapper {
  aspect-ratio: 4 / 3;
  flex-shrink: 0;
  overflow: hidden;
  background: linear-gradient(
    90deg,
    var(--color-shimmer-from) 25%,
    var(--color-shimmer-via) 50%,
    var(--color-shimmer-from) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}

.product-card__image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  transition: opacity 0.3s;
}

.product-card__image--loading {
  opacity: 0;
}

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

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.product-card__body {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.product-card__title {
  font-size: 1.125rem;
  margin-bottom: 0.5rem;
}

.product-card__description {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  flex-grow: 1;
}

.product-card__price {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

/* Added-to-cart state */

.product-card--added {
  outline: 2px solid var(--color-added);
  outline-offset: -2px;
}

.product-card--added .btn-cart {
  background-color: var(--color-added);
}

.product-card--added .btn-cart:hover {
  background-color: var(--color-added-hover);
}

/* Result count */

.result-count {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  position: absolute;
  bottom: 0;
  left: 0;
  transform: translateY(100%);
  padding-top: 0.375rem;
  animation: fade-in 0.3s;
}

/* Empty state */

.empty-state {
  text-align: center;
  color: var(--color-text-placeholder);
  padding: 3rem 1rem;
  font-size: 1rem;
  animation: fade-in 0.3s;
}

/* Hidden state for search filtering */

.product-card--hiding {
  opacity: 0;
  transform: scale(0.95);
}

.product-card--hidden {
  display: none;
}

/* Responsive: 2 columns */

@media (min-width: 768px) {
  .controls {
    flex-direction: row;
    align-items: center;
  }

  .search-input {
    flex: 1;
  }

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

/* Responsive: 3 columns */

@media (min-width: 1024px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Reduced motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}