:root {
  /* Palette - Swiss Medical / Editorial */
  --bg-paper: #FDFCF8;
  --bg-surface: #FFFFFF;
  --bg-surface-alt: #F4F4F5;
  
  --text-primary: #18181B;
  --text-secondary: #52525B;
  --text-tertiary: #A1A1AA;
  
  --accent-primary: #0F766E; /* Teal 700 */
  --accent-light: #CCFBF1; /* Teal 100 */
  --accent-dark: #134E4A;
  
  --border-subtle: #E4E4E7;
  --border-focus: #27272A;

  --font-serif: 'Instrument Serif', serif;
  --font-sans: 'Plus Jakarta Sans', sans-serif;

  --container-width: 1200px;
  --header-height: 60px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-paper);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.1;
  margin: 0;
  color: var(--text-primary);
}

img {
  max-width: 100%;
  display: block;
}

/* Navigation */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253, 252, 248, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.nav-content {
  width: min(var(--container-width), 92vw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.nav-divider {
  color: var(--text-tertiary);
  font-weight: 300;
}

.nav-section {
  color: var(--text-secondary);
  font-weight: 500;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-link:hover {
  color: var(--text-primary);
}

/* Search Component */
.search-wrapper {
  position: relative;
  margin-left: auto;
  margin-right: 0;
}

.search-input {
  background: var(--bg-surface-alt);
  border: 1px solid var(--border-subtle);
  border-radius: 99px;
  padding: 0.5rem 1rem 0.5rem 2.2rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-primary);
  width: 240px;
  transition: all 0.2s ease;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2352525B'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'%3E%3C/path%3E%3C/svg%3E");
  background-size: 16px;
  background-repeat: no-repeat;
  background-position: 12px center;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  background-color: var(--bg-surface);
  width: 320px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.search-results {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 380px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.12);
  display: none;
  z-index: 1000;
  overflow: hidden;
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  display: block;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  text-decoration: none !important; /* Override specific link styles */
  transition: background 0.1s ease;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background: var(--bg-surface-alt);
}

.search-result-item .result-title {
  font-family: var(--font-sans); /* Use sans for search results for clarity */
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
  line-height: 1.3;
}

.search-result-item .result-meta {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-weight: 600;
}

.no-results {
  padding: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  text-align: center;
}

/* Layout Shell */
.blog-shell {
  width: min(var(--container-width), 92vw);
  margin: 4rem auto 6rem;
}

/* Blog Index */
.minimal-hero {
  text-align: center;
  padding: 4rem 0 6rem;
  max-width: 800px;
  margin: 0 auto;
}

.minimal-hero h1 {
  font-size: clamp(3.5rem, 8vw, 6rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  margin-bottom: 2rem;
}

.minimal-hero h1 em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  color: var(--text-secondary);
}

.minimal-hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 48ch;
  margin: 0 auto;
  line-height: 1.5;
}

.topic-pills {
  margin: -3rem auto 2.5rem;
  max-width: 980px;
}

.topic-pill-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
}

.topic-pill {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 0.34rem;
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  background: var(--bg-surface);
  color: var(--text-secondary);
  padding: 0.34rem 0.64rem 0.34rem 0.74rem;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.topic-pill-total {
  font-weight: 700;
}

.topic-pill:hover {
  border-color: #D4D4D8;
  color: var(--text-primary);
  transform: translateY(-1px);
}

.topic-pill:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.topic-pill.is-active {
  border-color: #99F6E4;
  background: #ECFDF5;
  color: var(--accent-dark);
}

.topic-pill .topic-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.35rem;
  padding: 0.08rem 0.34rem;
  border-radius: 999px;
  background: var(--accent-light);
  color: var(--accent-dark);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0;
}

.topic-pill.is-active .topic-count {
  background: var(--accent-dark);
  color: #FFFFFF;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

.blog-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 2rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.blog-card:hover {
  border-color: var(--border-focus);
  transform: translateY(-4px);
}

.blog-card.is-hidden {
  display: none;
}

.card-content {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.card-meta {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.blog-card h2 {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.blog-card h2 a {
  text-decoration: none;
}

.card-description {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.card-link {
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.card-link span {
  transition: transform 0.2s ease;
}

.card-link:hover span {
  transform: translateX(4px);
}

.blog-filter-empty {
  margin: 2rem 0 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Post Page Layout */
.post-header {
  padding: 4rem 0 4rem;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.post-header .eyebrow {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.post-header h1 {
  font-size: clamp(3rem, 6vw, 4.5rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.post-header .dek {
  font-size: 1.25rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 65ch;
  margin: 0 auto 2rem;
}

.post-header .byline {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  font-size: 0.9rem;
  color: var(--text-tertiary);
  font-weight: 500;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1.5rem;
  display: inline-flex;
}

.post-grid {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 4rem;
  align-items: start;
}

/* Sidebar TOC */
.toc-sidebar {
  position: relative;
  align-self: stretch;
}

.toc-sticky {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 1rem;
}

.toc {
  font-size: 0.9rem;
}

.toc-title {
  font-family: var(--font-sans);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

.toc ol {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li {
  margin-bottom: 0.75rem;
}

.toc a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  line-height: 1.4;
  transition: color 0.2s ease, transform 0.2s ease;
}

.toc a:hover {
  color: var(--text-primary);
  transform: translateX(2px);
}

/* Article Body */
.article-body {
  max-width: 720px; /* Optimal reading width */
  margin: 0 auto; /* Center in the available space if needed, though grid handles it */
  font-size: 1.125rem; /* 18px body */
}

.article-body p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

.article-body .lead-paragraph {
  font-size: 1.35rem;
  color: var(--text-primary);
  font-weight: 400;
  line-height: 1.5;
  margin-bottom: 2.5rem;
}

.article-body h2 {
  font-size: 2.25rem;
  margin-top: 3.5rem;
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.article-body ul, 
.article-body ol {
  padding-left: 0;
  margin-bottom: 2rem;
  list-style-position: inside;
}

.article-body li {
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
}

.article-body a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color: var(--accent-primary);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.article-body a:hover {
  background-color: var(--accent-light);
  text-decoration: none;
}

/* Custom Lists */
ul.check-list, 
ul.warning-list, 
ul.data-sheet,
ul.metrics-list {
  list-style: none;
}

ul.check-list li, 
ul.warning-list li {
  padding-left: 1.5rem;
  position: relative;
}

ul.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-primary);
  font-weight: bold;
}

ul.warning-list li::before {
  content: '⚠';
  position: absolute;
  left: 0;
  color: #D97706; /* Amber 600 */
}

/* Data Sheet Style */
.data-sheet {
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  overflow: hidden;
}

.data-sheet li {
  padding: 1rem;
  margin: 0;
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1rem;
  align-items: baseline;
}

.data-sheet li:last-child {
  border-bottom: none;
}

.data-sheet li span {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-tertiary);
  font-weight: 600;
  letter-spacing: 0.05em;
}

/* Playbook Steps */
.playbook-steps {
  margin: 2rem 0;
  border-left: 2px solid var(--border-subtle);
  padding-left: 2rem;
}

.playbook-step {
  margin-bottom: 2rem;
  position: relative;
}

.step-number {
  position: absolute;
  left: -2.9rem;
  top: 0;
  width: 1.8rem;
  height: 1.8rem;
  background: var(--bg-paper);
  border: 2px solid var(--text-tertiary);
  color: var(--text-tertiary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.step-content strong {
  display: block;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.step-content p {
  font-size: 1rem;
  margin: 0;
}

/* Inline CTA */
.cta-inline {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 1.5rem;
  margin: 3rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-radius: 4px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.02);
}

.cta-content {
  display: flex;
  flex-direction: column;
}

.cta-content strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
}

.cta-content span {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.cta-link {
  white-space: nowrap;
  background: var(--text-primary);
  color: white !important;
  padding: 0.75rem 1.25rem;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none !important;
  transition: background 0.2s ease;
}

.cta-link:hover {
  background: #333;
}

/* Final CTA */
.final-cta {
  background: var(--accent-dark);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
  margin-top: 5rem;
  border-radius: 8px;
}

.final-cta h3 {
  color: white;
  font-size: 2rem;
  margin-bottom: 1rem;
}

.final-cta p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 50ch;
  margin: 0 auto 2rem;
}

.final-cta .cta-button {
  display: inline-block;
  background: white;
  color: var(--accent-dark);
  padding: 1rem 2rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 99px;
}

/* FAQ Grid */
.faq-grid {
  display: grid;
  gap: 1.5rem;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 1.5rem;
  border-radius: 4px;
}

.faq-item h3 {
  margin-top: 0;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.faq-item p {
  margin: 0;
  font-size: 0.95rem;
}

/* Medical Note */
.medical-note {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 3rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 1rem;
  font-style: italic;
}

/* References */
.references {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.references li {
  margin-bottom: 0.5rem;
  word-break: break-all;
}

/* Mobile Responsiveness */
@media (max-width: 900px) {
  .post-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .toc-sidebar {
    display: none; /* Hide TOC on mobile for now, or move it */
  }

  .minimal-hero h1,
  .post-header h1 {
    font-size: 3rem;
  }

  .topic-pills {
    margin: -3.4rem auto 2rem;
  }
}

@media (max-width: 600px) {
  .nav-content {
    flex-wrap: wrap;
    gap: 0.75rem;
    height: auto;
    padding: 0.75rem 0;
  }
  
  .site-nav {
    height: auto;
  }

  .search-wrapper {
    margin-left: 0;
    width: 100%;
    order: 3;
  }
  
  .search-input {
    width: 100%;
  }
  
  .search-input:focus {
    width: 100%;
  }
  
  .search-results {
    width: 100%;
    left: 0;
    right: 0;
  }

  html {
    font-size: 15px;
  }
  
  .data-sheet li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .cta-inline {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .cta-link {
    width: 100%;
    text-align: center;
    justify-content: center;
  }

  .topic-pills {
    margin: -2.5rem 0 1.75rem;
  }

  .topic-pill-list {
    justify-content: center;
  }

  .topic-pill {
    font-size: 0.64rem;
    padding: 0.3rem 0.58rem 0.3rem 0.64rem;
    letter-spacing: 0.03em;
    gap: 0.28rem;
  }

  .topic-pill .topic-count {
    min-width: 1.25rem;
    font-size: 0.6rem;
    padding: 0.07rem 0.28rem;
  }
}

/* Site footer */
.site-footer {
  margin-top: 3rem;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary, #6b7280);
}
.footer-content {
  max-width: 680px;
  margin: 0 auto;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin: 0.75rem 0;
}
.footer-links a {
  color: var(--accent, #0f766e);
  text-decoration: none;
}
.footer-links a:hover {
  text-decoration: underline;
}
.footer-disclaimer {
  font-size: 0.78rem;
  margin-top: 0.75rem;
  color: var(--text-secondary, #9ca3af);
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  margin: 2.5rem 0 1rem;
  padding: 1rem 0;
}
.pagination a {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  border: 1px solid var(--border, #e5e7eb);
  border-radius: 6px;
  color: var(--accent, #0f766e);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.15s;
}
.pagination a:hover {
  background: var(--accent, #0f766e);
  color: #fff;
}
.page-info {
  font-size: 0.85rem;
  color: var(--text-secondary, #6b7280);
}