:root {
  /* Color Palette - Light Mode (Default) */
  --bg-primary: #ffffff;
  --bg-secondary: #f4f4f4;
  --fg-primary: #000000;
  --fg-secondary: #555555;
  --border-color: #e0e0e0;
  --chip-bg: #eeeeee;
  --focus-ring: #000000;
  
  /* Typography */
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
  
  /* Spacing */
  --space-unit: 8px;
  --container-max-width: 1400px;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Color Palette - Dark Mode */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --fg-primary: #ffffff;
    --fg-secondary: #aaaaaa;
    --border-color: #333333;
    --chip-bg: #333333;
    --focus-ring: #ffffff;
  }
}

/* Reset & Base Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--fg-primary);
  margin: 0;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* Layout */
.container, main, header, footer {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 calc(var(--space-unit) * 2);
}

.site-header {
  width: 100%;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  /* Reset max-width/margin from generic selector above if needed, but 'header' selector below handles specific spacing */
}

.site-nav a {
  text-decoration: none;
  color: var(--fg-primary);
  transition: opacity 0.2s;
}

.site-nav a:hover {
  opacity: 0.6;
}

/* Page Headers (inside Main or specific views) */
main header {
  padding-top: calc(var(--space-unit) * 4);
  padding-bottom: calc(var(--space-unit) * 2);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: calc(var(--space-unit) * 4);
}

main header h1 {
  font-size: 2rem;
  margin-bottom: var(--space-unit);
}

/* Search Section */
.search-container {
  display: flex;
  gap: var(--space-unit);
  margin-bottom: calc(var(--space-unit) * 3);
}

#search-bar {
  flex: 1;
  padding: calc(var(--space-unit) * 1.5);
  font-family: inherit;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--fg-primary);
  border-radius: 0; /* Square edges */
  appearance: none;
}

#search-bar:focus {
  outline: 2px solid var(--focus-ring);
  border-color: transparent;
}

#search-submit-button {
  padding: 0 calc(var(--space-unit) * 3);
  background-color: var(--fg-primary);
  color: var(--bg-primary);
  border: none;
  font-weight: 600;
  cursor: pointer;
  border-radius: 0;
  text-transform: uppercase;
  font-size: 0.9rem;
}

#search-submit-button:hover {
  opacity: 0.9;
}

/* Filters (Sidebar/Top) */
nav fieldset {
  border: none;
  padding: 0;
  margin: 0 0 calc(var(--space-unit) * 4) 0;
}

nav legend {
  font-weight: 600;
  margin-bottom: var(--space-unit);
  font-size: 1.1rem;
  padding: 0;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--space-unit) * 1.5);
}

nav li {
  display: flex;
  align-items: center;
}

nav input[type="checkbox"] {
  appearance: none;
  width: 1.2em;
  height: 1.2em;
  border: 1px solid var(--fg-secondary);
  margin-right: var(--space-unit);
  display: grid;
  place-content: center;
}

nav input[type="checkbox"]::before {
  content: "";
  width: 0.65em;
  height: 0.65em;
  background-color: var(--fg-primary);
  transform: scale(0);
  transition: 120ms transform ease-in-out;
}

nav input[type="checkbox"]:checked::before {
  transform: scale(1);
}

nav label {
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--fg-secondary);
}

nav input[type="checkbox"]:checked + label {
  color: var(--fg-primary);
  font-weight: 500;
}


/* Product Grid */
.product-list {
  display: grid;
  /* Mobile: 2 columns */
  grid-template-columns: repeat(2, 1fr); 
  gap: calc(var(--space-unit) * 2);
  list-style: none;
  padding: 0;
  margin: 0;
}

/* Tablet & Desktop: 3 or 4 columns based on space */
@media (min-width: 768px) {
  .product-list {
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--space-unit) * 4);
  }
}

@media (min-width: 1024px) {
  .product-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.reading-item {
  display: flex;
  flex-direction: column;
  background: transparent;
  padding: 0;
  border-radius: 0;
  cursor: pointer;
}

/* Image Styles */
.thumbnail-container {
  width: 100%;
  aspect-ratio: 1 / 1.2; /* Slightly taller aspect ratio for fashion feel */
  overflow: hidden;
  background-color: var(--bg-secondary);
  margin-bottom: var(--space-unit);
}

.thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  /* No border as requested */
  /* Grayscale filter removed */
  transition: transform 0.3s ease;
}

.reading-item:hover .thumbnail {
  transform: scale(1.02);
}

/* Product Info */
.details {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
}

.meta-info {
  display: flex;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--fg-secondary);
  font-family: var(--font-mono);
  margin-top: 4px;
}

.meta-info span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Chips for Allergens */
.additional-info {
  margin-top: calc(var(--space-unit) * 1);
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.allergen-chip {
  font-size: 0.75rem;
  background-color: var(--chip-bg);
  color: var(--fg-primary);
  padding: 2px 6px;
  border-radius: 4px; /* Minimal rounding for chips */
  white-space: nowrap;
}

/* Footer */
footer {
  margin-top: calc(var(--space-unit) * 8);
  padding-top: calc(var(--space-unit) * 4);
  padding-bottom: calc(var(--space-unit) * 4);
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--fg-secondary);
}

/* Utility */
.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }
.ref-link { color: var(--fg-secondary); vertical-align: super; font-size: smaller; }

/* Quote Block */
blockquote {
  margin: calc(var(--space-unit) * 4) 0;
  padding-left: calc(var(--space-unit) * 2);
  border-left: 2px solid var(--fg-primary);
  font-style: italic;
  font-size: 1.2rem;
}

cite {
  display: block;
  margin-top: var(--space-unit);
  font-size: 0.9rem;
  font-style: normal;
  color: var(--fg-secondary);
}