/* =============================================
   PeptideKnow — Light Theme
   Clean, bright, user-friendly design
   ============================================= */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --bg-alt: #f6f8fa;
  --bg-elevated: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #555e6e;
  --text-tertiary: #8892a2;
  --accent: #0f7b6c;
  --accent-hover: #0a6358;
  --accent-light: #e6f7f4;
  --accent-bg: #f0faf8;
  --border: #e2e6ea;
  --border-light: #eef1f4;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --card-shadow-hover: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 14px;
}

html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
body {
  overflow-x: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-hover); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border-width: 0; }
.skip-link { position: absolute; top: -9999px; left: 0; background: var(--accent); color: #fff; padding: 0.5rem 1rem; z-index: 1000; border-radius: 0 0 var(--radius-sm) 0; }
.skip-link:focus { top: 0; }

.container { max-width: 1140px; margin: 0 auto; padding: 0 1.25rem; }
.container-narrow { max-width: 760px; }

/* --- Header --- */
.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
  text-decoration: none;
  flex-shrink: 0;
}
.logo svg { color: var(--accent); }
.logo-text {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.125rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text);
}
.logo-text strong { font-weight: 700; color: var(--accent); }

.main-nav { flex: 1; }
.main-nav ul {
  display: flex;
  list-style: none;
  gap: 0.25rem;
}
.main-nav a {
  display: block;
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background 0.15s, color 0.15s;
}
.main-nav a:hover { background: var(--bg-alt); color: var(--text); }
.main-nav a.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

/* Nav dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown > a { display: inline-flex; align-items: center; gap: 0.3rem; }
.nav-dropdown > a svg { transition: transform 0.2s; }
.nav-dropdown:hover > a svg { transform: rotate(180deg); }
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  padding: 0.5rem 0;
  z-index: 200;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
}
.nav-dropdown-menu a:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.header-actions { display: flex; align-items: center; gap: 0.5rem; }
.header-search {
  display: flex;
  align-items: center;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.header-search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15, 123, 108, 0.1);
}
.header-search input {
  border: none;
  background: transparent;
  padding: 0.5rem 0.75rem;
  font-size: 0.8125rem;
  width: 200px;
  color: var(--text);
  outline: none;
  font-family: inherit;
}
.header-search input::placeholder { color: var(--text-tertiary); }
.header-search button {
  background: none;
  border: none;
  padding: 0.5rem;
  color: var(--text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
}
.header-search button:hover { color: var(--accent); }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0.25rem;
}

/* Autocomplete dropdown */
.search-autocomplete {
  position: absolute;
  top: 60px;
  right: 1.25rem;
  width: 320px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow-hover);
  z-index: 200;
  max-height: 400px;
  overflow-y: auto;
}
.search-autocomplete ul { list-style: none; }
.search-autocomplete li a {
  display: block;
  padding: 0.625rem 1rem;
  color: var(--text);
  font-size: 0.875rem;
  border-bottom: 1px solid var(--border-light);
}
.search-autocomplete li a:hover { background: var(--accent-light); }
.search-autocomplete li a .ac-name { font-weight: 600; }
.search-autocomplete li a .ac-cat { color: var(--text-tertiary); font-size: 0.75rem; display: block; }

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, #f0faf8 0%, #e8f4f1 30%, #f6f8fa 100%);
  border-bottom: 1px solid var(--border-light);
  overflow: hidden;
}
.hero-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  min-height: 440px;
}
.hero-content { padding: 3rem 0; }
.hero h1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: clamp(1.75rem, 1.2rem + 2.5vw, 2.5rem);
  font-weight: 700;
  color: var(--text);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}
.hero-subtitle {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  max-width: 520px;
}
.hero-subtitle strong { color: var(--accent); font-weight: 600; }
.hero-search {
  display: flex;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.2s, box-shadow 0.2s;
  max-width: 520px;
  margin-bottom: 1rem;
}
.hero-search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(15, 123, 108, 0.1);
}
.hero-search input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 0.875rem 1rem;
  font-size: 0.9375rem;
  color: var(--text);
  outline: none;
  font-family: inherit;
}
.hero-search input::placeholder { color: var(--text-tertiary); }
.hero-search button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.875rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
  white-space: nowrap;
}
.hero-search button:hover { background: var(--accent-hover); }

.hero-quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-size: 0.8125rem;
}
.hero-quick-links span { color: var(--text-tertiary); font-weight: 500; }
.hero-quick-links a {
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-secondary);
  font-weight: 500;
  background: var(--bg);
  transition: all 0.15s;
  font-size: 0.8125rem;
}
.hero-quick-links a:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

.hero-image {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(0,0,0,0.1);
  align-self: stretch;
  min-height: 320px;
}
.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- Sections --- */
.section { padding: 3.5rem 0; }
.section-alt { background: var(--bg-alt); }
.section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 1rem;
}
.section-header h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.section-heading-center {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 0.5rem;
}
.section-subheading {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 560px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}
.view-all {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}
.view-all:hover { text-decoration: underline; }

/* --- Category Cards (with images) --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.category-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
  box-shadow: var(--card-shadow);
}
.category-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
  border-color: var(--accent);
}
.category-card-img {
  height: 140px;
  overflow: hidden;
}
.category-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.category-card:hover .category-card-img img { transform: scale(1.05); }
.category-card-body {
  padding: 1rem 1.125rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.category-card-body h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.375rem;
}
.category-card-body p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.category-card .count {
  display: inline-block;
  margin-top: 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  font-family: 'JetBrains Mono', monospace;
}

/* --- Peptide Cards --- */
.peptide-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.875rem;
}
.peptide-card {
  display: block;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.125rem;
  text-decoration: none;
  color: var(--text);
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
  box-shadow: var(--card-shadow);
}
.peptide-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
  border-color: var(--accent);
}
.peptide-card h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.25rem;
}
.peptide-card .card-cats {
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.peptide-card p:last-child {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* --- Audience Grid --- */
.audience-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
.audience-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: box-shadow 0.2s, transform 0.2s;
}
.audience-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
}
.audience-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}
.audience-card-body { padding: 1.25rem 1.5rem; }
.audience-card-body h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.audience-card-body p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- About Split --- */
.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}
.about-split-text h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.about-split-text p {
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1rem;
  font-size: 0.9375rem;
}
.about-split-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.about-split-image img { width: 100%; height: auto; }

/* --- Two Column Layout --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}
.two-col h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

/* --- Recent List --- */
.recent-list { display: flex; flex-direction: column; gap: 0; }
.list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
  text-decoration: none;
  transition: background 0.15s;
}
.list-item:hover { background: var(--accent-light); margin: 0 -0.5rem; padding: 0.75rem 0.5rem; border-radius: var(--radius-sm); }
.list-name { font-weight: 500; font-size: 0.9375rem; }
.list-cat { font-size: 0.75rem; color: var(--text-tertiary); text-align: right; max-width: 50%; }

/* --- A-Z Grid --- */
.az-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-bottom: 1.25rem;
}
.az-link {
  padding: 0.25rem 0.625rem;
  font-size: 0.8125rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.15s;
}
.az-link:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }

/* --- Buttons --- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s;
  font-family: inherit;
}
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  background: transparent;
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 600;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
  font-family: inherit;
}
.btn-outline:hover { background: var(--accent); color: #fff; }
.text-link { font-weight: 500; color: var(--accent); }
.text-link:hover { text-decoration: underline; }

/* --- Page Header --- */
.page-header {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border-light);
  padding: 2rem 0 1.75rem;
}
.page-header h1 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}
.page-header p {
  color: var(--text-secondary);
  margin-top: 0.375rem;
  font-size: 1rem;
  max-width: 600px;
}
.page-header-image {
  position: relative;
  overflow: hidden;
  padding: 2.5rem 0 2rem;
}
.page-header-bg { position: absolute; inset: 0; z-index: 0; }
.page-header-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.12; filter: saturate(0.5); }
.page-header-bg::after { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(246,248,250,0.7) 0%, var(--bg-alt) 100%); }
.page-header-image .container { position: relative; z-index: 1; }

.breadcrumb {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  margin-bottom: 0.5rem;
}
.breadcrumb a { color: var(--accent); }
.breadcrumb span[aria-hidden] { margin: 0 0.375rem; }

/* --- Prose (About page) --- */
.prose h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--text);
  margin: 2rem 0 0.75rem;
  letter-spacing: -0.02em;
}
.prose h2:first-child { margin-top: 0; }
.prose p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 1rem; }
.prose ul, .prose ol { color: var(--text-secondary); margin: 0 0 1rem 1.5rem; line-height: 1.7; }
.prose strong { color: var(--text); font-weight: 600; }

/* --- Detail Page --- */
.detail-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  padding: 2rem 0 3rem;
}
.detail-main { min-width: 0; }
.detail-sidebar { order: 0; }

.info-box {
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}
.info-box h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}
.info-row {
  display: flex;
  justify-content: space-between;
  padding: 0.375rem 0;
  font-size: 0.8125rem;
  border-bottom: 1px solid var(--border-light);
}
.info-row:last-child { border-bottom: none; }
.info-label { color: var(--text-tertiary); font-weight: 500; }
.info-value { color: var(--text); font-weight: 500; text-align: right; max-width: 55%; }

.detail-section {
  margin-bottom: 2rem;
  scroll-margin-top: 80px;
}
.detail-section h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-light);
  letter-spacing: -0.01em;
}
.detail-section p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 0.75rem; }
.detail-section ul { color: var(--text-secondary); line-height: 1.7; margin: 0 0 0.75rem 1.5rem; }

.sequence-box {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  background: var(--bg-alt);
  border: 1px solid var(--border-light);
  padding: 1rem;
  border-radius: var(--radius-sm);
  word-break: break-all;
  line-height: 1.8;
  color: var(--text);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: 0.5rem;
}
.tag-group a {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 500;
  border-radius: 100px;
  text-decoration: none;
  transition: all 0.15s;
}
.tag-group a:hover {
  background: var(--accent);
  color: #fff;
}

.synergy-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.5rem 0 1rem; }
.synergy-tag {
  padding: 0.375rem 0.75rem;
  background: var(--accent-light);
  border: 1px solid rgba(15, 123, 108, 0.15);
  border-radius: 100px;
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 500;
  transition: all 0.15s;
}
.synergy-tag:hover { background: var(--accent); color: #fff; }

.reference-list { list-style: none; margin: 0; padding: 0; }
.reference-list li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-light);
  font-size: 0.8125rem;
  line-height: 1.5;
}
.reference-list li a { color: var(--accent); }

.toc-sidebar {
  position: sticky;
  top: 76px;
}
.toc-sidebar h4 {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: 0.75rem;
}
.toc-sidebar ul { list-style: none; padding: 0; }
.toc-sidebar li { margin-bottom: 0.25rem; }
.toc-sidebar a {
  display: block;
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: all 0.15s;
}
.toc-sidebar a:hover { color: var(--accent); background: var(--accent-light); }
.toc-sidebar a.active {
  border-left-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
  font-weight: 500;
}

/* --- Peptide Index Grid --- */
.peptide-index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.letter-group { margin-bottom: 2rem; }
.letter-group h2 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-light);
}
.letter-group ul { list-style: none; columns: 2; column-gap: 2rem; margin: 0; padding: 0; }
.letter-group li { break-inside: avoid; }
.letter-group a {
  display: block;
  padding: 0.375rem 0;
  color: var(--text);
  font-size: 0.9375rem;
  font-weight: 500;
  border-bottom: 1px solid var(--border-light);
}
.letter-group a:hover { color: var(--accent); }

/* --- Categories Index Large Cards --- */
.category-card-lg {
  display: grid;
  grid-template-columns: 1fr 2fr;
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
  margin-bottom: 1rem;
  transition: box-shadow 0.2s, border-color 0.2s;
  box-shadow: var(--card-shadow);
}
.category-card-lg:hover { box-shadow: var(--card-shadow-hover); border-color: var(--accent); }
.category-card-lg h3 {
  font-family: 'Space Grotesk', 'Inter', sans-serif;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.375rem;
}
.category-card-lg p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 0.5rem; }
.category-card-lg .count { font-size: 0.75rem; font-weight: 600; color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.cat-card-body { padding: 1.25rem 1.5rem; }
.cat-card-peptides { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: 0.75rem; }
.cat-card-peptides span {
  font-size: 0.75rem;
  padding: 0.125rem 0.5rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 100px;
  font-weight: 500;
}

/* --- Search Page --- */
.search-container { padding: 2rem 0 3rem; }
.search-form-lg {
  display: flex;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 600px;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.search-form-lg:focus-within { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(15, 123, 108, 0.1); }
.search-form-lg input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 1rem 1.25rem;
  font-size: 1rem;
  color: var(--text);
  outline: none;
  font-family: inherit;
}
.search-form-lg button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 1rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
.search-form-lg button:hover { background: var(--accent-hover); }

.search-results { list-style: none; padding: 0; }
.search-result-item {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border-light);
}
.search-result-item h3 { margin-bottom: 0.25rem; }
.search-result-item h3 a { font-size: 1.0625rem; font-weight: 600; color: var(--text); }
.search-result-item h3 a:hover { color: var(--accent); }
.search-result-item .result-cats { font-size: 0.75rem; color: var(--accent); margin-bottom: 0.375rem; }
.search-result-item p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; }

/* --- Status Badges --- */
.status-badge {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 600;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.status-approved { background: #e6f7e9; color: #1a7f37; }
.status-clinical { background: #fff4e6; color: #9a5b13; }
.status-research { background: #e8f0fe; color: #1a56db; }
.status-preclinical { background: #f3e8ff; color: #7c3aed; }

/* --- Footer --- */
.site-footer {
  background: #1a1a2e;
  color: #c8ccd4;
  padding: 3rem 0 0;
}
.footer-inner { max-width: 1140px; margin: 0 auto; padding: 0 1.25rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2rem; }
.footer-col h4 { color: #fff; font-size: 0.9375rem; font-weight: 600; margin-bottom: 0.75rem; }
.footer-col p { font-size: 0.8125rem; line-height: 1.6; opacity: 0.8; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 0.375rem; }
.footer-col a { color: #c8ccd4; font-size: 0.8125rem; transition: color 0.15s; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1.25rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.footer-bottom p { font-size: 0.75rem; opacity: 0.7; line-height: 1.6; }
.footer-links a { color: #c8ccd4; font-size: 0.75rem; }
.footer-links a:hover { color: #fff; }

/* --- 404 --- */
.not-found { text-align: center; padding: 4rem 0; }
.not-found h1 { font-size: 4rem; color: var(--text-tertiary); }

/* --- Mobile --- */
@media (max-width: 768px) {
  .main-nav { display: none; }
  .main-nav.open { display: block; position: absolute; top: 60px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); padding: 1rem 1.25rem; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
  .main-nav.open ul { flex-direction: column; }
  .mobile-menu-btn { display: block; }
  .header-search { display: none; }
  
  .hero-inner { grid-template-columns: 1fr; min-height: auto; gap: 1rem; padding: 0 1rem; }
  .hero-content { padding: 2rem 0 0; }
  .hero-image { height: 220px; border-radius: var(--radius); margin-bottom: 1rem; }
  .hero h1 { font-size: 1.5rem; }
  .hero-subtitle { font-size: 0.9375rem; }
  .hero-search { max-width: 100%; }
  .hero-search input { padding: 0.75rem 0.75rem; font-size: 0.875rem; min-width: 0; }
  .hero-search button { padding: 0.75rem 1rem; font-size: 0.8125rem; }
  .hero-quick-links { font-size: 0.75rem; }
  .hero-quick-links a { font-size: 0.75rem; padding: 0.1875rem 0.5rem; }
  
  .category-grid { grid-template-columns: 1fr 1fr; }
  .peptide-grid { grid-template-columns: 1fr 1fr; }
  .audience-grid { grid-template-columns: 1fr; }
  .about-split { grid-template-columns: 1fr; gap: 1.5rem; }
  .about-split-image { order: -1; }
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
  .detail-grid { grid-template-columns: 1fr; }
  .detail-sidebar { order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .category-card-lg { grid-template-columns: 1fr; }
  .letter-group ul { columns: 1; }
}

@media (max-width: 480px) {
  .category-grid { grid-template-columns: 1fr; }
  .peptide-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
}

/* =============================================
   Guide & Tool Pages
   ============================================= */

/* Guide Layout */
.guide-layout { display: grid; grid-template-columns: 1fr 280px; gap: 2.5rem; }
.guide-main { min-width: 0; }
.guide-sidebar .sticky-sidebar { position: sticky; top: 80px; }
.guide-intro { margin-bottom: 2rem; }
.guide-intro > p { font-size: 1.0625rem; line-height: 1.7; color: var(--text-secondary); }

.guide-section { margin-bottom: 3rem; padding-top: 1rem; }
.guide-section h2 { font-family: 'Space Grotesk', sans-serif; font-size: 1.5rem; font-weight: 700; margin-bottom: 1rem; color: var(--text); }
.guide-section h3 { font-size: 1.125rem; font-weight: 600; margin: 1.5rem 0 0.75rem; }
.guide-section h4 { font-size: 0.9375rem; font-weight: 600; margin-bottom: 0.375rem; }
.guide-section p { margin-bottom: 0.75rem; line-height: 1.65; }
.guide-section ul, .guide-section ol { margin: 0.5rem 0 1rem 1.25rem; }
.guide-section li { margin-bottom: 0.375rem; line-height: 1.55; }

/* Sidebar */
.sidebar-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1rem; }
.sidebar-card h3 { font-size: 0.9375rem; font-weight: 700; margin-bottom: 0.75rem; }
.sidebar-card h4 { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; color: var(--text-secondary); margin-bottom: 0.5rem; }
.sidebar-card hr { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }
.sidebar-nav { list-style: none; padding: 0; margin: 0; }
.sidebar-nav li { margin-bottom: 0.25rem; }
.sidebar-nav a { display: block; padding: 0.375rem 0; font-size: 0.875rem; color: var(--accent); }
.sidebar-nav a:hover { color: var(--accent-hover); }
.sidebar-link { display: block; margin-top: 0.75rem; font-size: 0.875rem; font-weight: 500; color: var(--accent); }

.mini-table { width: 100%; font-size: 0.8125rem; border-collapse: collapse; }
.mini-table th, .mini-table td { padding: 0.375rem 0.5rem; text-align: left; border-bottom: 1px solid var(--border-light); }
.mini-table th { font-weight: 600; color: var(--text-secondary); font-size: 0.75rem; text-transform: uppercase; }
.mini-table a { color: var(--accent); }

/* Data Tables */
.table-responsive { overflow-x: auto; margin: 1rem 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.875rem; }
.data-table th, .data-table td { padding: 0.625rem 0.75rem; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th { font-weight: 600; font-size: 0.8125rem; color: var(--text-secondary); background: var(--bg-alt); white-space: nowrap; }
.data-table td { color: var(--text); }
.data-table td a { color: var(--accent); }
.data-table tr:hover td { background: var(--accent-bg); }
.monitor-table-wrap { overflow-x: auto; }

/* Callouts */
.callout { padding: 1rem 1.25rem; border-radius: var(--radius-sm); margin: 1rem 0; font-size: 0.9375rem; line-height: 1.55; }
.callout strong { display: block; margin-bottom: 0.25rem; }
.callout-warning { background: #fff8e1; border-left: 4px solid #f9a825; color: #5d4037; }
.callout-info { background: var(--accent-bg); border-left: 4px solid var(--accent); color: var(--text); }

/* Numbered Steps */
.numbered-steps { list-style: none; counter-reset: step; padding: 0; margin: 1rem 0; }
.numbered-steps li { counter-increment: step; position: relative; padding: 0.75rem 0 0.75rem 3rem; margin-bottom: 0.5rem; border-bottom: 1px solid var(--border-light); }
.numbered-steps li::before { content: counter(step); position: absolute; left: 0; top: 0.75rem; width: 2rem; height: 2rem; background: var(--accent); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 0.8125rem; }
.numbered-steps li h4 { margin-bottom: 0.25rem; }
.numbered-steps li p { margin-bottom: 0.375rem; color: var(--text-secondary); font-size: 0.9375rem; }
.numbered-steps-lg li { padding: 1rem 0 1rem 3.5rem; margin-bottom: 1rem; }

/* Info Grid */
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1rem 0; }
.info-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.info-card h4 { font-size: 0.9375rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--text); }
.info-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.55; }
.info-card ul { margin: 0.375rem 0 0 1rem; font-size: 0.875rem; }
.info-card li { margin-bottom: 0.25rem; color: var(--text-secondary); }

/* Mechanism Grid */
.mechanism-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin: 1rem 0; }
.mechanism-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; transition: border-color 0.15s; }
.mechanism-card:hover { border-color: var(--accent); }
.mechanism-card h4 { font-size: 0.875rem; font-weight: 600; color: var(--accent); margin-bottom: 0.375rem; }
.mechanism-card p { font-size: 0.8125rem; color: var(--text-secondary); line-height: 1.5; margin: 0; }

/* Category Overview */
.category-overview { margin: 1rem 0; }
.cat-row { padding: 1rem 0; border-bottom: 1px solid var(--border-light); }
.cat-row:last-child { border-bottom: none; }
.cat-row h4 { margin-bottom: 0.25rem; }
.cat-row h4 a { color: var(--accent); font-weight: 600; }
.cat-row p { font-size: 0.9375rem; color: var(--text-secondary); margin: 0; }

/* Detail Box */
.detail-box { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin: 1rem 0; }
.detail-box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.5rem; }
.detail-box h4 { font-size: 0.875rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 0.5rem; color: var(--accent); }
.detail-box ul { margin: 0; padding-left: 1rem; font-size: 0.875rem; }
.detail-box li { margin-bottom: 0.25rem; color: var(--text-secondary); }

/* Decision List */
.decision-list { margin: 1rem 0; }
.decision-item { padding: 1rem 0; border-bottom: 1px solid var(--border-light); }
.decision-item:last-child { border-bottom: none; }
.decision-item h4 { font-weight: 600; margin-bottom: 0.375rem; color: var(--text); }
.decision-item p { font-size: 0.9375rem; color: var(--text-secondary); margin: 0; }
.decision-item ul { margin: 0.5rem 0 0 1.25rem; }
.decision-item li { font-size: 0.9375rem; color: var(--text-secondary); margin-bottom: 0.25rem; }

/* Safety List */
.safety-list { margin: 1rem 0 1rem 1.25rem; }
.safety-list li { margin-bottom: 0.625rem; line-height: 1.55; font-size: 0.9375rem; }

/* Supplies Grid */
.supplies-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; margin: 1rem 0; }
.supply-item { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; }
.supply-item h4 { font-size: 0.875rem; font-weight: 700; margin-bottom: 0.375rem; }
.supply-item p { font-size: 0.8125rem; color: var(--text-secondary); margin: 0; line-height: 1.5; }

/* Formula Box */
.formula-box { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.5rem; margin: 1rem 0; text-align: center; }
.formula-box p { font-family: 'JetBrains Mono', monospace; font-size: 0.9375rem; margin: 0; }

/* Checklist */
.checklist { list-style: none; padding: 0; margin: 1rem 0; }
.checklist li { padding: 0.375rem 0 0.375rem 1.75rem; position: relative; font-size: 0.9375rem; }
.checklist li::before { content: '\2713'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* FAQ List */
.faq-list { margin: 1rem 0; }
.faq-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 0.5rem; overflow: hidden; }
.faq-item summary { padding: 0.875rem 1rem; cursor: pointer; font-weight: 500; font-size: 0.9375rem; background: var(--bg-alt); list-style: none; display: flex; align-items: center; justify-content: space-between; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.125rem; color: var(--accent); font-weight: 700; flex-shrink: 0; margin-left: 0.75rem; }
.faq-item[open] summary::after { content: '\2212'; }
.faq-item p { padding: 0 1rem 1rem; margin: 0; font-size: 0.9375rem; color: var(--text-secondary); line-height: 1.6; }

/* Timeline */
.timeline-vertical { position: relative; padding-left: 2.5rem; margin: 1.5rem 0; }
.timeline-vertical::before { content: ''; position: absolute; left: 0.875rem; top: 0; bottom: 0; width: 2px; background: var(--border); }
.timeline-item { position: relative; padding-bottom: 1.5rem; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-marker { position: absolute; left: -2.5rem; width: 1.75rem; height: 1.75rem; background: var(--accent); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 0.75rem; font-weight: 700; }
.timeline-content h4 { font-weight: 600; margin-bottom: 0.125rem; }
.timeline-content p { font-size: 0.875rem; color: var(--text-secondary); margin: 0; }

/* Principles Grid */
.principles-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1rem 0; }
.principle-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.principle-card h3 { font-size: 0.9375rem; font-weight: 700; margin-bottom: 0.5rem; color: var(--text); }
.principle-card p { font-size: 0.8125rem; color: var(--text-secondary); margin: 0; line-height: 1.5; }

/* Stack Cards */
.stack-card { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem; margin-bottom: 1.5rem; transition: border-color 0.15s; }
.stack-card:hover { border-color: var(--accent); }
.stack-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; flex-wrap: wrap; gap: 0.5rem; }
.stack-header h3 { font-size: 1.125rem; font-weight: 700; margin: 0; display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.stack-badge { display: inline-block; padding: 0.125rem 0.5rem; border-radius: 99px; font-size: 0.6875rem; font-weight: 600; text-transform: uppercase; }
.badge-recovery { background: #dcfce7; color: #166534; }
.badge-growth { background: #dbeafe; color: #1e40af; }
.badge-healing { background: #fef3c7; color: #92400e; }
.badge-advanced { background: #fce7f3; color: #9d174d; }
.badge-metabolic { background: #d1fae5; color: #065f46; }
.badge-cognitive { background: #ede9fe; color: #5b21b6; }
.badge-longevity { background: #e0e7ff; color: #3730a3; }
.stack-difficulty { font-size: 0.75rem; font-weight: 500; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.05em; }
.stack-compounds { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.compound-chip { display: inline-block; padding: 0.25rem 0.75rem; background: var(--accent-light); color: var(--accent); border-radius: 99px; font-size: 0.8125rem; font-weight: 500; transition: background 0.15s; }
.compound-chip:hover { background: var(--accent); color: #fff; }
.plus { color: var(--text-tertiary); font-weight: 300; font-size: 1.25rem; }
.stack-details { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.25rem; }
.stack-col h4 { font-size: 0.8125rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; color: var(--text-secondary); margin-bottom: 0.375rem; }
.stack-col p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; margin: 0; }
.stack-col ul { margin: 0; padding-left: 1rem; font-size: 0.8125rem; }
.stack-col li { margin-bottom: 0.25rem; color: var(--text-secondary); }
.stack-col li a { color: var(--accent); }

/* Warning Grid */
.warning-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; margin: 1rem 0; }
.warning-card { background: #fff8e1; border: 1px solid #ffe082; border-radius: var(--radius); padding: 1rem; }
.warning-card h4 { font-size: 0.875rem; font-weight: 600; color: #5d4037; margin-bottom: 0.375rem; }
.warning-card p { font-size: 0.8125rem; color: #6d4c41; margin: 0; line-height: 1.5; }

/* Calculator */
.calc-layout { display: grid; grid-template-columns: 1fr 320px; gap: 2.5rem; }
.calc-main { min-width: 0; }
.calc-sidebar { }
.calc-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 2rem; margin-bottom: 2rem; }
.calc-card h2 { font-family: 'Space Grotesk', sans-serif; font-size: 1.125rem; font-weight: 700; margin: 1.5rem 0 1rem; color: var(--text); }
.calc-card h2:first-child { margin-top: 0; }
.calc-form { margin-bottom: 1.5rem; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.8125rem; font-weight: 600; color: var(--text); margin-bottom: 0.375rem; }
.form-group small { display: block; font-size: 0.75rem; color: var(--text-tertiary); margin-top: 0.25rem; }
.form-group input, .form-group select { width: 100%; padding: 0.625rem 0.75rem; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.9375rem; font-family: inherit; background: var(--bg); color: var(--text); transition: border-color 0.15s; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(15,123,108,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 100px 1fr; gap: 0.75rem; }

.btn-primary { display: inline-block; padding: 0.625rem 1.5rem; background: var(--accent); color: #fff; font-weight: 600; font-size: 0.9375rem; border: none; border-radius: var(--radius-sm); cursor: pointer; transition: background 0.15s; font-family: inherit; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-lg { padding: 0.875rem 2rem; font-size: 1rem; width: 100%; text-align: center; }
.btn-secondary { display: inline-block; padding: 0.5rem 1rem; background: var(--bg); border: 1px solid var(--border); color: var(--text); font-weight: 500; font-size: 0.8125rem; border-radius: var(--radius-sm); cursor: pointer; transition: background 0.15s, border-color 0.15s; font-family: inherit; }
.btn-secondary:hover { background: var(--bg-alt); border-color: var(--accent); }
.btn-outline { display: inline-block; padding: 0.5rem 1.25rem; background: transparent; border: 1px solid var(--accent); color: var(--accent); font-weight: 500; font-size: 0.875rem; border-radius: var(--radius-sm); transition: background 0.15s, color 0.15s; }
.btn-outline:hover { background: var(--accent); color: #fff; }

/* Calculator Results */
.calc-results { background: var(--bg); border: 2px solid var(--accent); border-radius: var(--radius-lg); padding: 2rem; }
.calc-results h2 { font-family: 'Space Grotesk', sans-serif; font-size: 1.25rem; margin-bottom: 1.25rem; }
.results-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.result-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; text-align: center; }
.result-primary { background: var(--accent-bg); border-color: var(--accent); }
.result-highlight { background: var(--accent); border-color: var(--accent); }
.result-highlight .result-label, .result-highlight .result-unit { color: rgba(255,255,255,0.8); }
.result-highlight .result-value { color: #fff; }
.result-label { display: block; font-size: 0.6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-secondary); margin-bottom: 0.25rem; }
.result-value { display: block; font-family: 'Space Grotesk', monospace; font-size: 1.75rem; font-weight: 700; color: var(--text); line-height: 1.2; }
.result-unit { display: block; font-size: 0.6875rem; color: var(--text-tertiary); margin-top: 0.25rem; }
.result-summary { background: var(--bg-alt); border-radius: var(--radius); padding: 1rem; margin-bottom: 1.5rem; }
.result-summary p { margin: 0; font-size: 0.9375rem; line-height: 1.6; }

/* Syringe Visual */
.syringe-diagram { display: flex; align-items: center; gap: 1rem; margin: 0.75rem 0; }
.syringe-body { width: 40px; height: 200px; background: #f0f0f0; border: 2px solid #999; border-radius: 4px 4px 20px 20px; position: relative; overflow: hidden; }
.syringe-fill { position: absolute; bottom: 0; left: 0; right: 0; background: var(--accent); opacity: 0.6; transition: height 0.5s ease; }
.syringe-label { font-family: 'JetBrains Mono', monospace; font-size: 0.875rem; color: var(--text-secondary); }

/* Guides Index */
.guides-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1.25rem; }
.guide-card { display: block; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; transition: border-color 0.15s, box-shadow 0.15s; }
.guide-card:hover { border-color: var(--accent); box-shadow: var(--card-shadow-hover); color: var(--text); }
.guide-card h2, .guide-card h3 { font-family: 'Space Grotesk', sans-serif; font-weight: 700; margin-bottom: 0.5rem; color: var(--text); }
.guide-card h2 { font-size: 1.25rem; }
.guide-card h3 { font-size: 1.0625rem; }
.guide-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.55; margin-bottom: 0.75rem; }
.guide-card-featured { border: 2px solid var(--accent); background: var(--accent-bg); grid-column: 1 / -1; }
.guide-badge { display: inline-block; padding: 0.125rem 0.5rem; background: var(--accent); color: #fff; border-radius: 99px; font-size: 0.6875rem; font-weight: 600; text-transform: uppercase; margin-bottom: 0.5rem; }
.guide-read-time { font-size: 0.75rem; color: var(--text-tertiary); }

/* Tools Grid */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
.tool-card { display: block; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; transition: border-color 0.15s; }
.tool-card:hover { border-color: var(--accent); color: var(--text); }
.tool-icon { color: var(--accent); margin-bottom: 0.75rem; }
.tool-card h3 { font-family: 'Space Grotesk', sans-serif; font-size: 1.0625rem; font-weight: 700; margin-bottom: 0.375rem; color: var(--text); }
.tool-card p { font-size: 0.875rem; color: var(--text-secondary); margin: 0; }

/* Quick Ref */
.quick-ref-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.25rem; }
.quick-ref-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.quick-ref-card h4 { font-size: 0.875rem; font-weight: 700; margin-bottom: 0.625rem; }
.inline-links { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.375rem; }
.inline-links li { }
.inline-links a { display: inline-block; padding: 0.25rem 0.625rem; background: var(--bg); border: 1px solid var(--border); border-radius: 99px; font-size: 0.8125rem; color: var(--accent); transition: background 0.15s, border-color 0.15s; }
.inline-links a:hover { background: var(--accent-light); border-color: var(--accent); }

/* CTA Box */
.cta-box { background: var(--accent-bg); border: 1px solid var(--accent); border-radius: var(--radius); padding: 1.5rem; margin: 1.5rem 0; text-align: center; }
.cta-box h4 { font-size: 1rem; font-weight: 700; margin-bottom: 0.75rem; }
.cta-links { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* Comparison table highlight */
.comparison-table td:nth-child(2) { background: var(--accent-bg); }

/* Recon steps */
.recon-steps { list-style: none; counter-reset: recon; padding: 0; margin: 0; }
.recon-steps li { counter-increment: recon; padding: 0.5rem 0 0.5rem 1.75rem; font-size: 0.8125rem; color: var(--text-secondary); position: relative; border-bottom: 1px solid var(--border-light); }
.recon-steps li:last-child { border-bottom: none; }
.recon-steps li::before { content: counter(recon); position: absolute; left: 0; width: 1.25rem; height: 1.25rem; background: var(--accent); color: #fff; border-radius: 50%; font-size: 0.6875rem; display: flex; align-items: center; justify-content: center; font-weight: 700; }

/* Dosage section enhancements on detail pages */
.dosage-table-wrap { overflow-x: auto; margin: 1rem 0; }
.dosage-routes { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0.75rem; margin: 1rem 0; }
.route-card { background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem; }
.route-card h5 { font-size: 0.8125rem; font-weight: 600; margin-bottom: 0.25rem; }
.route-card p { font-size: 0.75rem; color: var(--text-secondary); margin: 0; }
.route-badge { display: inline-block; padding: 0.0625rem 0.375rem; border-radius: 99px; font-size: 0.6875rem; font-weight: 500; }
.route-badge-high { background: #dcfce7; color: #166534; }
.route-badge-moderate { background: #fef3c7; color: #92400e; }
.route-badge-low { background: #fee2e2; color: #991b1b; }

.stacking-section .stack-card { margin-bottom: 1rem; padding: 1rem; }
.popularity-badge { display: inline-flex; align-items: center; gap: 0.25rem; padding: 0.125rem 0.5rem; background: var(--accent-light); color: var(--accent); border-radius: 99px; font-size: 0.75rem; font-weight: 600; }

/* Responsive for guide/calc pages */
@media (max-width: 768px) {
  .guide-layout { grid-template-columns: 1fr; }
  .guide-sidebar { order: -1; }
  .guide-sidebar .sticky-sidebar { position: static; }
  .calc-layout { grid-template-columns: 1fr; }
  .calc-sidebar { order: -1; }
  .form-row { grid-template-columns: 1fr 80px 1fr; }
  .results-grid { grid-template-columns: 1fr 1fr; }
  .stack-details { grid-template-columns: 1fr; }
  .detail-box-grid { grid-template-columns: 1fr; }
  .principles-grid { grid-template-columns: 1fr; }
  .guides-promo-grid { grid-template-columns: 1fr; }
  .guide-promo-featured { grid-column: auto; }
  .nav-dropdown-menu { position: fixed; top: 60px; left: 0; right: 0; border-radius: 0; }
}

/* Guides Promo Grid (Homepage) */
.guides-promo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.guide-promo-card {
  display: flex;
  flex-direction: column;
  padding: 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.guide-promo-card:hover {
  border-color: var(--accent);
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
  color: var(--text);
}
.guide-promo-featured {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  gap: 1.5rem;
  background: var(--accent-bg);
  border-color: var(--accent);
  padding: 1.5rem 2rem;
}
.guide-promo-featured .guide-promo-icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
}
.guide-promo-featured h3 { font-size: 1.125rem; margin-bottom: 0.25rem; }
.guide-promo-featured p { font-size: 0.9rem; margin-bottom: 0.25rem; }
.guide-promo-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  color: var(--accent);
  margin-bottom: 0.75rem;
  flex-shrink: 0;
}
.guide-promo-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.guide-promo-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}
.guide-promo-cta {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: auto;
}
@media (max-width: 640px) {
  .guides-promo-grid { grid-template-columns: 1fr 1fr; }
  .guide-promo-featured { flex-direction: column; grid-column: 1 / -1; }
}

/* Crosslink grid (internal linking on detail pages) */
.crosslink-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}
.crosslink-card {
  display: flex;
  flex-direction: column;
  padding: 0.875rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.crosslink-card:hover { border-color: var(--accent); box-shadow: var(--card-shadow); color: var(--text); }
.crosslink-card strong { font-size: 0.875rem; font-weight: 600; margin-bottom: 0.125rem; }
.crosslink-card span { font-size: 0.75rem; color: var(--text-secondary); }
.crosslink-inline { font-size: 0.875rem; margin-top: 0.75rem; }
.crosslink-inline a { font-weight: 600; }

/* Stack cards (detail pages) */
.stack-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.stack-card h4 { font-family: 'Space Grotesk', sans-serif; font-size: 1rem; font-weight: 700; margin-bottom: 0.375rem; }
.stack-purpose { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.625rem; font-style: italic; }
.stack-compounds { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-bottom: 0.5rem; }
.stack-compound-link, .stack-compound-tag {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  border-radius: 99px;
  font-size: 0.8125rem;
  font-weight: 500;
}
.stack-compound-link { background: var(--accent-light); color: var(--accent); border: 1px solid transparent; }
.stack-compound-link:hover { border-color: var(--accent); color: var(--accent); }
.stack-compound-tag { background: var(--bg); border: 1px solid var(--border); color: var(--text-secondary); }
.stack-notes { font-size: 0.8125rem; color: var(--text-secondary); margin: 0; line-height: 1.5; }
.dosage-note, .recon-note { font-size: 0.875rem; color: var(--text-secondary); margin-top: 0.75rem; line-height: 1.5; }

/* Sidebar tools */
.sidebar-tools { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border-light); display: flex; flex-direction: column; gap: 0.5rem; }
.sidebar-tool-link {
  display: flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 0.625rem;
  font-size: 0.8125rem; font-weight: 500;
  color: var(--accent);
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  transition: background 0.15s;
}
.sidebar-tool-link:hover { background: var(--accent-bg); color: var(--accent); }