/* ═══════════════════════════════════════════════════════
   Nutrition Database — Design System
   Reference-manual aesthetic. Paper white. Ink black.
   Green accent for nutrition/food. 2px borders.
   ═══════════════════════════════════════════════════════ */

/* ── Reset & Variables ── */
:root {
  --paper: #FCFAF7;
  --ink: #1A1A1A;
  --green: #2D7D46;
  --green-light: #E8F5E9;
  --red: #D33A2C;
  --yellow: #F5A623;
  --blue: #2563EB;
  --gray-100: #F5F3F0;
  --gray-200: #E8E5E0;
  --gray-300: #D4D0C8;
  --gray-500: #8B857A;
  --gray-700: #4A4540;
  --border: 2px solid var(--ink);
  --border-light: 1px solid var(--gray-300);
  --radius: 2px;
  --font-mono: 'SF Mono', 'Cascadia Code', 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 900px;
}

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

html {
  font-size: 16px;
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  background:
    radial-gradient(circle, rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  min-height: 100vh;
}

/* ── Typography ── */
h1, h2, h3, h4 {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.4rem; border-bottom: 2px solid var(--ink); padding-bottom: 0.4rem; margin: 2rem 0 1rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 0.75rem; }
p { margin-bottom: 1rem; }
a { color: var(--green); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--ink); }

/* ── Header ── */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--paper);
  border-bottom: var(--border);
  padding: 0 1rem;
  backdrop-filter: blur(8px);
}
.header-inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 52px;
}
.logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.03em;
}
.logo span { color: var(--green); }
.header-nav { display: flex; gap: 1.5rem; align-items: center; }
.header-nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-700);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.header-nav a:hover { color: var(--ink); }

/* ── Search ── */
.search-container {
  max-width: 640px; margin: 2rem auto; padding: 0 1rem;
}
.search-box {
  width: 100%;
  padding: 0.8rem 1rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  border: var(--border);
  background: var(--paper);
  border-radius: var(--radius);
  outline: none;
}
.search-box:focus { border-color: var(--green); box-shadow: 0 0 0 3px var(--green-light); }
.search-results {
  margin-top: 0.5rem;
  background: var(--paper);
  border: var(--border);
  border-radius: var(--radius);
  display: none;
  max-height: 400px; overflow-y: auto;
}
.search-results.active { display: block; }
.search-result-item {
  padding: 0.6rem 1rem;
  border-bottom: var(--border-light);
  display: flex; align-items: center; gap: 0.75rem;
  cursor: pointer;
}
.search-result-item:hover { background: var(--gray-100); }
.search-result-item .emoji { font-size: 1.5rem; }
.search-result-item .info { flex: 1; }
.search-result-item .name { font-weight: 600; }
.search-result-item .cat {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--gray-500);
  text-transform: uppercase;
}

/* ── Category Grid ── */
.category-grid {
  max-width: var(--max-width); margin: 2rem auto; padding: 0 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
}
.category-card {
  border: var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  transition: transform 0.1s ease;
}
.category-card:hover { transform: translateY(-2px); border-color: var(--green); }
.category-card .emoji { font-size: 1.75rem; display: block; margin-bottom: 0.5rem; }
.category-card .name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.9rem;
}
.category-card .count {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-top: 0.25rem;
}

/* ── Buttons ── */
.btn {
  display: inline-block;
  padding: 0.55rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  transition: all 0.15s ease;
}
.btn:hover { background: var(--green); border-color: var(--green); color: var(--paper); }
.btn-outline { background: var(--paper); color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.7rem; }

/* ── Nutrition Facts Panel ── */
.nutrition-facts {
  border: var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  max-width: 320px;
  background: var(--paper);
  font-size: 0.85rem;
}
.nutrition-facts .nf-title {
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.05em;
  border-bottom: 6px solid var(--ink);
  padding-bottom: 0.25rem;
  margin-bottom: 0.5rem;
}
.nutrition-facts .nf-serving {
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.nutrition-facts .nf-divider { border: none; border-top: 2px solid var(--ink); margin: 0.3rem 0; }
.nutrition-facts .nf-divider-thick { border-top: 6px solid var(--ink); }
.nutrition-facts .nf-row {
  display: flex; justify-content: space-between;
  padding: 0.15rem 0;
  border-bottom: 1px solid var(--gray-200);
}
.nutrition-facts .nf-row.bold { font-weight: 700; }
.nutrition-facts .nf-row.indent { padding-left: 1rem; }
.nutrition-facts .nf-dv { font-weight: 600; }

/* ── Macro Bars ── */
.macro-bars { margin: 1.5rem 0; }
.macro-bar-row { margin-bottom: 0.5rem; }
.macro-bar-label {
  display: flex; justify-content: space-between;
  font-family: var(--font-mono); font-size: 0.8rem;
  margin-bottom: 0.2rem;
}
.macro-bar-track {
  height: 8px; background: var(--gray-200);
  border-radius: var(--radius); overflow: hidden;
}
.macro-bar-fill { height: 100%; border-radius: var(--radius); }
.macro-bar-fill.protein { background: var(--red); }
.macro-bar-fill.carbs { background: var(--yellow); }
.macro-bar-fill.fat { background: var(--green); }

/* ── Score Cards ── */
.score-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.5rem;
  margin: 1rem 0;
}
.score-card {
  border: var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  text-align: center;
  background: var(--paper);
}
.score-card .score-value {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--green);
}
.score-card .score-value.high { color: var(--green); }
.score-card .score-value.medium { color: var(--yellow); }
.score-card .score-value.low { color: var(--red); }
.score-card .score-label {
  font-size: 0.7rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.25rem;
}

/* ── Nutrient Table ── */
.nutrient-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.85rem;
}
.nutrient-table th {
  font-family: var(--font-mono);
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: var(--border);
  background: var(--gray-100);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.nutrient-table td {
  padding: 0.4rem 0.75rem;
  border-bottom: var(--border-light);
}
.nutrient-table tr:nth-child(even) { background: var(--gray-100); }
.nutrient-table .dv-bar {
  display: inline-block; height: 6px;
  background: var(--green);
  border-radius: var(--radius);
  vertical-align: middle; margin-right: 0.4rem;
}

/* ── Comparison Table ── */
.compare-table {
  width: 100%; border-collapse: collapse;
  margin: 1rem 0;
}
.compare-table th {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.6rem 0.75rem;
  border-bottom: var(--border);
  text-align: center;
}
.compare-table th:first-child { text-align: left; }
.compare-table td {
  padding: 0.5rem 0.75rem;
  border-bottom: var(--border-light);
  text-align: center;
}
.compare-table td:first-child { text-align: left; font-weight: 600; }
.compare-table .winner { color: var(--green); font-weight: 700; }
.compare-table .winner::after { content: ' ★'; }

/* ── Hero ── */
.hero {
  max-width: var(--max-width); margin: 2rem auto 0; padding: 1.5rem 1rem;
  border-bottom: var(--border);
}
.hero h1 { margin-bottom: 0.25rem; }
.hero .subtitle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--gray-500);
}

/* ── Content ── */
.content {
  max-width: var(--max-width); margin: 0 auto; padding: 1rem 1rem 3rem;
}

/* ── About Section ── */
.about-section {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: var(--border);
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.feature-card {
  border: var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  background: var(--paper);
}
.feature-card .feature-icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.feature-card h4 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-bottom: 0.25rem;
}
.feature-card p { font-size: 0.8rem; color: var(--gray-700); }

/* ── FAQ ── */
.faq-section { margin-top: 2rem; }
.faq-item { margin-bottom: 1rem; }
.faq-item .faq-q {
  font-family: var(--font-mono);
  font-weight: 600;
  cursor: pointer;
  padding: 0.6rem 0;
  border-bottom: var(--border-light);
}
.faq-item .faq-a { padding: 0.5rem 0; font-size: 0.9rem; }

/* ── Similar Foods ── */
.similar-foods {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.5rem;
  margin-top: 1rem;
}
.similar-food-card {
  border: var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  text-decoration: none;
  color: var(--ink);
}
.similar-food-card:hover { border-color: var(--green); }

/* ── Footer ── */
.site-footer {
  border-top: var(--border);
  margin-top: 3rem;
  padding: 2rem 1rem;
  text-align: center;
}
.footer-inner { max-width: var(--max-width); margin: 0 auto; }
.site-footer nav { display: flex; justify-content: center; gap: 1.5rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.site-footer nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-500);
  text-decoration: none;
}
.site-footer nav a:hover { color: var(--ink); }
.site-footer .copyright { font-size: 0.75rem; color: var(--gray-500); }

/* ── Chips / Badges ── */
.chip {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  border: var(--border);
  border-radius: var(--radius);
  background: var(--paper);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.chip.green { background: var(--green-light); border-color: var(--green); color: var(--green); }
.chip.red { background: #FCE8E6; border-color: var(--red); color: var(--red); }
.chip.yellow { background: #FFF8E1; border-color: var(--yellow); color: #B8860B; }

/* ── Supplement Card ── */
.supplement-card {
  border: var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex; gap: 1rem; align-items: flex-start;
  margin-bottom: 0.75rem;
}
.supplement-card .supp-image {
  width: 60px; height: 60px;
  background: var(--gray-100);
  border: var(--border);
  border-radius: var(--radius);
  flex-shrink: 0;
}
.supplement-card .supp-info { flex: 1; }
.supplement-card h4 { margin: 0 0 0.25rem; }
.supplement-card .evidence {
  font-size: 0.7rem;
  color: var(--gray-500);
}
.evidence-strong { color: var(--green); }
.evidence-moderate { color: var(--yellow); }
.evidence-limited { color: var(--red); }

/* ── Popular Foods Row ── */
.popular-row {
  max-width: var(--max-width); margin: 1.5rem auto; padding: 0 1rem;
}
.popular-row h2 {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: none;
  margin-bottom: 0.75rem;
}
.popular-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.5rem;
}

/* ── Breadcrumbs ── */
.breadcrumbs {
  max-width: var(--max-width); margin: 0 auto; padding: 0.75rem 1rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-500);
}
.breadcrumbs a { color: var(--gray-500); text-decoration: none; }
.breadcrumbs a:hover { color: var(--ink); }
.breadcrumbs span { color: var(--ink); }

/* ── Tab Navigation ── */
.tabs {
  display: flex; gap: 0;
  border-bottom: var(--border);
  margin-bottom: 1rem;
}
.tab-btn {
  padding: 0.5rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  color: var(--gray-500);
}
.tab-btn.active {
  color: var(--ink);
  border-bottom-color: var(--green);
  font-weight: 600;
}
.tab-btn:hover { color: var(--ink); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Comparison Dimension Card ── */
.dimension-card {
  border: var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  overflow: hidden;
}
.dimension-card .dim-header {
  background: var(--gray-100);
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.85rem;
  border-bottom: var(--border-light);
}
.dimension-card .dim-body { padding: 0.75rem 1rem; }
.dimension-card .dim-row {
  display: flex; justify-content: space-between;
  padding: 0.3rem 0;
  font-size: 0.85rem;
}
.dimension-card .dim-winner {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: var(--radius);
}
.dim-winner.win-a { background: #E8F5E9; color: var(--green); }
.dim-winner.win-b { background: #E3F2FD; color: var(--blue); }
.dim-winner.tie { background: var(--gray-100); color: var(--gray-500); }

/* ── Responsive ── */
@media (max-width: 640px) {
  h1 { font-size: 1.5rem; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .score-grid { grid-template-columns: repeat(2, 1fr); }
  .header-nav { gap: 0.75rem; }
  .header-nav a { font-size: 0.7rem; }
  .nutrition-facts { max-width: 100%; }
}