/* ============================================================
   PEPTIDE MAG — Blog Template CSS v1
   Long-form article layout with sticky TOC, progress bar
   Matches guide-template.css design language
   ============================================================ */

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

:root {
  --bg-primary: #f8f9fb;
  --bg-secondary: #f0f2f5;
  --bg-card: #ffffff;
  --bg-card-hover: #f6f7f9;
  --bg-input: #f2f3f6;
  --accent: #2563eb;
  --accent-bright: #3b82f6;
  --accent-dim: rgba(37, 99, 235, 0.08);
  --accent-glow: rgba(37, 99, 235, 0.18);
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-muted: #8a8a8a;
  --border: rgba(0, 0, 0, 0.08);
  --border-accent: rgba(37, 99, 235, 0.3);
  --glass-bg: rgba(250, 249, 247, 0.88);
  --glass-border: rgba(0, 0, 0, 0.06);
  --radius: 8px;
  --radius-lg: 16px;
  --font-display: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body: 'Source Sans 3', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-bright); }

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

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* --- Reading Progress Bar --- */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  z-index: 10001;
  transition: width 0.1s linear;
}



















/* --- Breadcrumb --- */
.breadcrumb {
  padding: 6.5rem 0 0;
}

.breadcrumb-inner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.breadcrumb-inner a {
  color: var(--text-muted);
  transition: color var(--transition);
}

.breadcrumb-inner a:hover { color: var(--accent); }

.breadcrumb-sep {
  color: var(--text-muted);
  opacity: 0.5;
  font-size: 0.7rem;
}

.breadcrumb-current {
  color: var(--text-secondary);
  font-weight: 500;
}

/* --- Article Hero --- */
.article-hero {
  padding: 2rem 0 3rem;
}

.article-hero-content {
  max-width: 720px;
}

.article-category-badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  padding: 0.3rem 0.85rem;
  border-radius: 100px;
  margin-bottom: 1.25rem;
}

.badge-how-to { background: rgba(37, 99, 235, 0.08); color: #2563eb; border: 1px solid rgba(37, 99, 235, 0.2); }
.badge-research { background: rgba(13, 148, 136, 0.08); color: #0d9488; border: 1px solid rgba(13, 148, 136, 0.2); }
.badge-industry { background: rgba(190, 60, 120, 0.08); color: #be3c78; border: 1px solid rgba(190, 60, 120, 0.2); }
.badge-deep-dive { background: rgba(124, 58, 237, 0.08); color: #7c3aed; border: 1px solid rgba(124, 58, 237, 0.2); }

.article-title {
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.1;
}

.article-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 640px;
}

/* --- Article Meta Bar --- */
.article-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.article-meta-item svg {
  width: 14px;
  height: 14px;
  opacity: 0.6;
}

.article-author {
  font-weight: 500;
  color: var(--text-secondary);
}

/* --- Main Layout: Sidebar + Content --- */
.article-body {
  padding-bottom: 5rem;
}

.article-layout {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
}

.article-content {
  flex: 1;
  min-width: 0;
  max-width: 720px;
}

/* --- Sticky TOC Sidebar --- */
.article-toc {
  width: 240px;
  flex-shrink: 0;
  position: sticky;
  top: 90px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.toc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.toc-title {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--accent);
}

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

.toc-list li {
  margin-bottom: 0.15rem;
}

.toc-list a {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 0.35rem 0.75rem;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}

.toc-list a:hover {
  color: var(--text-secondary);
  background: var(--accent-dim);
  border-left-color: rgba(37, 99, 235, 0.3);
}

.toc-list a.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-left-color: var(--accent);
  font-weight: 500;
}

/* --- Mobile TOC (collapsible) --- */
.toc-mobile {
  display: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 2rem;
}

.toc-mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem 1.25rem;
  background: none;
  border: none;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
}

.toc-mobile-toggle svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: transform var(--transition);
}

.toc-mobile.open .toc-mobile-toggle svg {
  transform: rotate(180deg);
}

.toc-mobile-list {
  list-style: none;
  padding: 0 1.25rem 1rem;
  display: none;
}

.toc-mobile.open .toc-mobile-list {
  display: block;
}

.toc-mobile-list li {
  margin-bottom: 0.25rem;
}

.toc-mobile-list a {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding: 0.4rem 0;
  text-decoration: none;
  transition: color var(--transition);
}

.toc-mobile-list a:hover {
  color: var(--accent);
}

/* --- Key Takeaways Box --- */
.key-takeaways {
  background: var(--accent-dim);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  margin-bottom: 3rem;
}

.key-takeaways-title {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.key-takeaways-title svg {
  width: 16px;
  height: 16px;
}

.key-takeaways ul {
  list-style: none;
  padding: 0;
}

.key-takeaways li {
  position: relative;
  padding: 0.4rem 0 0.4rem 1.5rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.key-takeaways li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* --- Content Sections --- */
.article-section {
  margin-bottom: 3rem;
  scroll-margin-top: 90px;
}

.article-section h2 {
  font-size: 1.6rem;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.article-section h3 {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  margin-top: 1.5rem;
}

.article-section p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.article-section p:last-child {
  margin-bottom: 0;
}

.article-section ul, .article-section ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.article-section li {
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0.4rem;
}

.article-section strong {
  color: var(--text-primary);
  font-weight: 600;
}

.article-section code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

/* --- Highlight Box --- */
.highlight-box {
  background: var(--accent-dim);
  border: 1px solid rgba(37, 99, 235, 0.15);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.highlight-box-title {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.highlight-box p, .highlight-box li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.highlight-box ul {
  padding-left: 1.25rem;
  margin: 0;
}

.highlight-box li {
  margin-bottom: 0.3rem;
}

/* --- Warning Box --- */
.warning-box {
  background: rgba(234, 88, 12, 0.06);
  border: 1px solid rgba(234, 88, 12, 0.15);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.warning-box-title {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: #ea580c;
  margin-bottom: 0.5rem;
}

.warning-box p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Checklist --- */
.checklist {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.checklist li {
  position: relative;
  padding: 0.6rem 0 0.6rem 2rem;
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
}

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

.checklist li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--accent);
  border-radius: 4px;
}

.checklist li::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 0.95rem;
  width: 10px;
  height: 5px;
  border-left: 2px solid var(--accent);
  border-bottom: 2px solid var(--accent);
  transform: rotate(-45deg);
}

/* --- Numbered Steps --- */
.steps {
  counter-reset: step-counter;
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}

.steps li {
  counter-increment: step-counter;
  position: relative;
  padding: 1rem 1rem 1rem 3.5rem;
  margin-bottom: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.93rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.steps li::before {
  content: counter(step-counter);
  position: absolute;
  left: 1rem;
  top: 1rem;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* --- Dosing/Data Table --- */
.data-table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.data-table thead th {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  color: #ffffff;
  background: var(--accent);
  text-align: left;
  padding: 0.85rem 1rem;
  white-space: nowrap;
}

.data-table thead th:first-child { border-radius: var(--radius) 0 0 0; }
.data-table thead th:last-child { border-radius: 0 var(--radius) 0 0; }

.data-table tbody td {
  padding: 0.85rem 1rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  line-height: 1.5;
  vertical-align: top;
}

.data-table tbody tr:hover { background: var(--accent-dim); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* --- Further Reading / Related Articles --- */
.further-reading {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border);
}

.further-reading-title {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.related-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: all var(--transition);
  text-decoration: none;
  display: block;
}

.related-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.related-card-badge {
  font-size: 0.6rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.5rem;
  border-radius: 100px;
  display: inline-block;
  margin-bottom: 0.5rem;
}

.related-card-name {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.related-card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --- Back to Blog Link --- */
.back-to-blog {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 1.5rem;
  transition: gap var(--transition);
}

.back-to-blog:hover {
  gap: 0.7rem;
}

.back-to-blog svg {
  width: 14px;
  height: 14px;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition);
  pointer-events: none;
  z-index: 100;
  color: var(--text-secondary);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--accent);
  color: #ffffff;
  border-color: var(--accent);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* --- Footer --- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 3rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.footer-brand {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: none;
  color: var(--text-primary);
}

.footer-tagline {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.footer-links a {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

.footer-links a:hover { color: var(--text-secondary); }

.footer-disclaimer {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.7;
  text-align: center;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.footer-bottom {
  text-align: center;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .article-toc {
    display: none;
  }

  .toc-mobile {
    display: block;
  }

  .article-layout {
    display: block;
  }
}

@media (max-width: 768px) {
  .container { padding: 0 1.25rem; }

  
  
  

  .article-title { font-size: clamp(1.8rem, 7vw, 2.8rem); }
  .article-meta { flex-wrap: wrap; gap: 0.75rem; }
  .key-takeaways { padding: 1.5rem; }
  .related-grid { grid-template-columns: 1fr; }

  .data-table { font-size: 0.8rem; }
  .data-table thead th { padding: 0.6rem 0.6rem; font-size: 0.6rem; }
  .data-table tbody td { padding: 0.6rem; }

  .footer-inner { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
}

@media (max-width: 480px) {
  .breadcrumb-inner { font-size: 0.72rem; }
  .article-hero { padding: 1.5rem 0 2rem; }
}

/* --- References Section --- */
.references-section { margin-top: 3rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.references-section h2 { font-size: 1.3rem; margin-bottom: 1.2rem; }
.references-list { list-style: none; padding: 0; counter-reset: ref-counter; }
.references-list li { counter-increment: ref-counter; position: relative; padding: 0.85rem 1rem 0.85rem 2.5rem; margin-bottom: 0.5rem; font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); transition: all var(--transition); }
.references-list li:hover { transform: translateX(2px); box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04); }
.references-list li::before { content: counter(ref-counter) '.'; position: absolute; left: 0.85rem; font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent); font-weight: 500; }
.references-list li em { color: var(--text-secondary); }
.ref-link { display: inline-block; margin-left: 0.5rem; font-size: 0.7rem; font-weight: 500; color: var(--accent); padding: 0.15rem 0.6rem; border: 1px solid var(--border-accent, var(--accent)); border-radius: 100px; transition: all var(--transition); text-decoration: none; vertical-align: middle; }
.ref-link:hover { background: var(--accent); color: #ffffff; border-color: var(--accent); }