/* ==========================================================================
   PureNovus — Shared Stylesheet
   Editorial / research-publication aesthetic
   ========================================================================== */

/* --- CSS Variables --- */
:root {
  /* Colours */
  --navy-900: #0a2c52;
  --navy-800: #0f3a6b;
  --navy-700: #14467f;
  --navy-600: #1a5599;
  --blue-700: #1c5ba0;
  --blue-600: #1e6cb8;
  --blue-500: #2b7dc7;
  --blue-100: #e8f1fa;
  --blue-50:  #f4f8fc;

  --ink-900: #0e1a2b;
  --ink-700: #2c3e54;
  --ink-500: #5a6b7e;
  --ink-300: #9aa8b8;

  --line: #e3e8ee;
  --line-strong: #c9d3de;

  --white: #ffffff;
  --bg-tint: #f7f9fc;

  /* Type */
  --font-sans: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* Layout */
  --container: 760px;
  --container-wide: 1080px;
  --radius: 8px;
  --radius-lg: 14px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(14, 26, 43, 0.06);
  --shadow-md: 0 4px 16px rgba(14, 26, 43, 0.08);

  /* Transitions */
  --t-fast: 150ms ease;
  --t-med: 250ms ease;
}

/* --- Reset & base --- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-900);
  background: var(--white);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue-600); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--blue-700); text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--navy-900);
  margin: 0 0 var(--space-4);
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 5vw, 2.75rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3.5vw, 1.875rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.0625rem; text-transform: uppercase; letter-spacing: 0.06em; }

p { margin: 0 0 var(--space-4); }

ul, ol { margin: 0 0 var(--space-4); padding-left: 1.5rem; }
li { margin-bottom: var(--space-2); }

hr { border: 0; border-top: 1px solid var(--line); margin: var(--space-7) 0; }

blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-5) var(--space-6);
  background: var(--blue-50);
  border-left: 3px solid var(--blue-600);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--navy-800);
  font-style: italic;
}
blockquote p:last-child { margin-bottom: 0; }

/* --- Layout containers --- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--space-5); }
.container-wide { max-width: var(--container-wide); margin: 0 auto; padding: 0 var(--space-5); }
.section { padding: var(--space-8) 0; }
.section-tight { padding: var(--space-7) 0; }

/* --- Header / nav --- */
.site-header {
  background: var(--navy-900);
  color: var(--white);
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(10, 44, 82, 0.15);
}
.site-header .container-wide {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--white);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.04em;
}
.brand:hover { text-decoration: none; color: var(--white); }
.brand-mark {
  width: 28px; height: 28px;
  background: var(--blue-500);
  clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
  flex-shrink: 0;
}
.brand-name .pure { color: var(--white); }
.brand-name .novus { color: var(--blue-500); font-weight: 400; }

.site-nav { display: flex; gap: var(--space-6); }
.site-nav a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  position: relative;
  padding: var(--space-2) 0;
}
.site-nav a:hover { color: var(--white); text-decoration: none; }
.site-nav a.active { color: var(--white); }
.site-nav a.active::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0; height: 2px;
  background: var(--blue-500);
}
.nav-toggle {
  display: none;
  background: none; border: 0; color: var(--white);
  font-size: 1.5rem; cursor: pointer; padding: var(--space-2);
}

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--navy-900) 0%, var(--navy-700) 100%);
  color: var(--white);
  padding: var(--space-9) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(43, 125, 199, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(43, 125, 199, 0.1) 0%, transparent 50%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }
.hero h1 { color: var(--white); margin-bottom: var(--space-5); }
.hero .lede {
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.85);
  max-width: 580px;
  margin: 0 auto var(--space-6);
  line-height: 1.7;
}
.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue-500);
  margin-bottom: var(--space-4);
}
.hero .eyebrow { color: rgba(43, 125, 199, 0.95); }

.hero-bullets {
  list-style: none;
  padding: 0;
  margin: var(--space-6) 0;
  display: inline-block;
  text-align: left;
}
.hero-bullets li {
  position: relative;
  padding-left: 1.75rem;
  color: rgba(255, 255, 255, 0.92);
  margin-bottom: var(--space-2);
}
.hero-bullets li::before {
  content: '';
  position: absolute; left: 0; top: 0.65rem;
  width: 8px; height: 8px;
  background: var(--blue-500);
  border-radius: 2px;
  transform: rotate(45deg);
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  background: var(--blue-600);
  color: var(--white);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 0;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--t-fast), transform var(--t-fast);
  text-decoration: none;
}
.btn:hover { background: var(--blue-700); color: var(--white); text-decoration: none; transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1.5px solid rgba(255, 255, 255, 0.6);
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.1); border-color: var(--white); }
.btn-light {
  background: var(--white);
  color: var(--navy-900);
}
.btn-light:hover { background: var(--blue-50); color: var(--navy-900); }

/* --- Section headings --- */
.section-title {
  text-align: center;
  color: var(--blue-700);
  margin-bottom: var(--space-3);
}
.section-subtitle {
  text-align: center;
  color: var(--ink-700);
  max-width: 600px;
  margin: 0 auto var(--space-7);
}

/* --- Cards --- */
.card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--t-fast), box-shadow var(--t-med), transform var(--t-med);
}
.card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-md);
}
.card h3 { color: var(--blue-700); margin-bottom: var(--space-3); }
.card .meta {
  font-size: 0.8125rem;
  color: var(--ink-500);
  margin-bottom: var(--space-3);
}
.card .read-more {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue-600);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-5);
}

/* --- Two-column callout --- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
}

/* --- Numbered list (research process, most-read) --- */
.numbered-list { list-style: none; padding: 0; margin: 0; }
.numbered-list > li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--space-5);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--line);
  margin: 0;
  align-items: start;
}
.numbered-list > li:last-child { border-bottom: 0; }
.numbered-list .num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  background: var(--blue-50);
  color: var(--blue-700);
  font-weight: 700;
  font-size: 1.125rem;
  border-radius: 50%;
}
.numbered-list h3 { margin-bottom: var(--space-2); font-size: 1.0625rem; }
.numbered-list .meta { font-size: 0.8125rem; color: var(--ink-500); margin-bottom: var(--space-2); }
.numbered-list p { margin-bottom: var(--space-2); color: var(--ink-700); }

/* --- Tinted band --- */
.band {
  background: var(--blue-50);
  padding: var(--space-8) 0;
}

/* --- Founder block --- */
.founder-block {
  background: var(--bg-tint);
  border-left: 3px solid var(--blue-600);
  padding: var(--space-6);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-top: var(--space-7);
}
.founder-block .eyebrow { color: var(--blue-600); }
.founder-block h3 { color: var(--blue-700); margin-bottom: var(--space-4); }
.founder-block .signoff { color: var(--ink-500); font-size: 0.9375rem; margin-top: var(--space-4); }

/* --- Article-page typography --- */
.article-body { max-width: 680px; margin: 0 auto; padding: var(--space-8) var(--space-5); }
.article-body p { font-size: 1.0625rem; line-height: 1.75; color: var(--ink-900); }
.article-body h2 {
  color: var(--blue-700);
  text-align: center;
  margin-top: var(--space-8);
  margin-bottom: var(--space-5);
}
.article-body h3 { color: var(--blue-700); margin-top: var(--space-6); }
.article-body strong { color: var(--navy-900); }

.habit-marker {
  text-align: center;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.habit-marker .pill {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: var(--blue-600);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 999px;
}
.article-body .habit-marker + h2 { margin-top: var(--space-3); text-align: center; }

/* References */
.references {
  background: var(--bg-tint);
  padding: var(--space-6);
  border-radius: var(--radius);
  margin-top: var(--space-8);
  font-size: 0.9375rem;
}
.references h3 {
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8125rem;
  color: var(--blue-700);
  margin-bottom: var(--space-5);
}
.references ol { padding-left: 1.25rem; }
.references li { margin-bottom: var(--space-3); color: var(--ink-700); line-height: 1.55; }
.references em { color: var(--ink-900); }

/* Article meta header */
.article-hero { text-align: center; }
.article-hero .breadcrumb {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(43, 125, 199, 0.95);
  margin-bottom: var(--space-4);
}
.article-hero h1 { color: var(--white); }
.article-hero .article-meta {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--space-4);
}

/* Article navigation */
.article-nav {
  border-top: 1px solid var(--line);
  padding-top: var(--space-6);
  margin-top: var(--space-8);
}
.article-nav .next-up,
.article-nav .back-to {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-500);
  margin-bottom: var(--space-2);
}
.article-nav h3 { margin-bottom: 0; }

/* --- Form embed wrapper --- */
.form-embed {
  background: var(--blue-50);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  text-align: center;
  margin-top: var(--space-6);
}
.form-embed h2 { color: var(--navy-900); }
.form-embed .bullets {
  display: inline-block;
  text-align: left;
  margin: var(--space-4) auto var(--space-5);
}

/* --- Tools / CGM section --- */
.tools-band {
  background: linear-gradient(180deg, var(--bg-tint) 0%, var(--white) 100%);
  padding: var(--space-8) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

/* --- Footer --- */
.site-footer {
  background: var(--navy-900);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-7) 0 var(--space-5);
  margin-top: var(--space-8);
}
.site-footer .brand { margin-bottom: var(--space-4); }
.site-footer .footer-tagline {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: var(--space-6);
}
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.site-footer nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  font-weight: 500;
}
.site-footer nav a:hover { color: var(--white); text-decoration: none; }
.site-footer .copyright {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.6;
}

/* --- Disclaimer block --- */
.disclaimer {
  background: var(--bg-tint);
  border-radius: var(--radius);
  padding: var(--space-5);
  margin-top: var(--space-7);
  font-size: 0.875rem;
  color: var(--ink-700);
}
.disclaimer .eyebrow { color: var(--ink-500); margin-bottom: var(--space-2); }

/* --- Updated badge --- */
.updated-badge {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  background: var(--blue-50);
  color: var(--blue-700);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 4px;
  margin-bottom: var(--space-5);
}

/* --- Pull-quote --- */
.pull-quote {
  text-align: center;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--blue-700);
  font-weight: 600;
  margin: var(--space-7) auto;
  max-width: 540px;
  padding: var(--space-5);
  border-top: 2px solid var(--blue-100);
  border-bottom: 2px solid var(--blue-100);
}

/* --- Highlighted callout --- */
.callout {
  background: var(--blue-50);
  border-left: 3px solid var(--blue-600);
  padding: var(--space-5) var(--space-6);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--space-6) 0;
  color: var(--navy-800);
  font-weight: 600;
}
.callout p:last-child { margin-bottom: 0; }

/* --- Comparison table (CGM) --- */
.cgm-table-wrap { overflow-x: auto; margin: var(--space-6) 0; }
.cgm-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-size: 0.9375rem;
}
.cgm-table th, .cgm-table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.cgm-table th {
  background: var(--navy-900);
  color: var(--white);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.cgm-table tr:last-child td { border-bottom: 0; }
.cgm-table tbody tr:nth-child(even) { background: var(--bg-tint); }
.cgm-table .label-cell { font-weight: 700; color: var(--navy-900); width: 24%; }

/* --- Product card (CGM, adhesion) --- */
.product-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-5);
  background: var(--white);
}
.product-card h3 { color: var(--blue-700); margin-bottom: var(--space-2); }
.product-card .product-meta {
  display: inline-block;
  background: var(--blue-50);
  color: var(--blue-700);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.25rem 0.625rem;
  border-radius: 4px;
  margin-bottom: var(--space-3);
}
.product-card .pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
}
@media (max-width: 600px) { .product-card .pros-cons { grid-template-columns: 1fr; } }
.product-card .pros-cons h4 {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-2);
}
.product-card .pros h4 { color: #2d7a4a; }
.product-card .cons h4 { color: #b8763e; }
.product-card .pros-cons ul { padding-left: 1.125rem; font-size: 0.9375rem; }
.product-card .affiliate-link {
  display: inline-block;
  margin-top: var(--space-4);
  padding: 0.625rem 1.25rem;
  background: var(--blue-600);
  color: var(--white);
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.product-card .affiliate-link:hover {
  background: var(--blue-700);
  text-decoration: none;
  color: var(--white);
}
.affiliate-disclosure {
  background: var(--bg-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  font-size: 0.875rem;
  color: var(--ink-700);
  margin: var(--space-5) 0;
}

/* --- Mobile nav --- */
@media (max-width: 820px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--navy-900);
    flex-direction: column;
    padding: var(--space-4) var(--space-5) var(--space-5);
    gap: var(--space-3);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: var(--space-3) 0; border-bottom: 1px solid rgba(255, 255, 255, 0.08); }
  .site-nav a:last-child { border-bottom: 0; }
  .site-header { position: relative; }
}

/* --- Tighter mobile spacing --- */
@media (max-width: 600px) {
  .section { padding: var(--space-7) 0; }
  .hero { padding: var(--space-7) 0; }
  body { font-size: 16px; }
}