:root {
  --bg: #faf9f7;
  --bg-warm: #f5f3ef;
  --stone: #e8e4de;
  --charcoal: #2d2d2d;
  --charcoal-muted: #6b6b6b;
  --amber: #b6784e;
  --white: #ffffff;
  --border: #e5e2dc;
  --font-sans: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: "Cormorant Garamond", Georgia, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--charcoal);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
.page-nav {
  align-items: center;
  background: rgba(250, 249, 247, 0.94);
  border-bottom: 1px solid var(--border);
  display: flex;
  height: 72px;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.page-logo {
  background: url("assets/corepure-logo-transparent.png") center / contain no-repeat;
  display: block;
  height: 42px;
  width: 174px;
}
.page-links { display: flex; gap: 30px; list-style: none; }
.page-links a {
  color: var(--charcoal-muted);
  font-size: 0.78rem;
  letter-spacing: 1px;
  text-decoration: none;
  text-transform: uppercase;
}
.page-links a:hover { color: var(--charcoal); }
.page-shell { margin: 0 auto; max-width: 1180px; padding: 92px 24px; }
.eyebrow {
  color: var(--amber);
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 2.6px;
  margin-bottom: 18px;
  text-transform: uppercase;
}
.page-hero { border-bottom: 1px solid var(--border); padding-bottom: 64px; }
h1, h2, h3 {
  color: var(--charcoal);
  font-family: var(--font-serif);
  font-weight: 300;
  letter-spacing: 0;
  line-height: 1.12;
}
h1 { font-size: clamp(3rem, 7vw, 5.6rem); max-width: 860px; }
h2 { font-size: clamp(2.1rem, 4vw, 3.2rem); margin-bottom: 28px; }
h3 { font-size: 1.55rem; margin-bottom: 12px; }
.lead {
  color: var(--charcoal-muted);
  font-size: 1.08rem;
  font-weight: 300;
  margin-top: 28px;
  max-width: 680px;
}
.section-block { padding: 72px 0 0; }
.article-grid, .doc-grid {
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.article-card, .doc-card {
  background: var(--white);
  border: 1px solid var(--border);
  display: block;
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.article-card:hover, .doc-card:hover {
  border-color: #d4cfc7;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.04);
  transform: translateY(-3px);
}
.article-card img {
  aspect-ratio: 1.85;
  display: block;
  object-fit: cover;
  width: 100%;
}
.article-card div, .doc-card { padding: 30px; }
.meta {
  color: var(--amber);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 1.7px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.muted { color: var(--charcoal-muted); font-weight: 300; }
.article-cover {
  margin: 0 0 58px;
  overflow: hidden;
}
.article-cover img {
  aspect-ratio: 1.85;
  display: block;
  object-fit: cover;
  width: 100%;
}
.article-layout {
  display: grid;
  gap: 72px;
  grid-template-columns: minmax(0, 760px) minmax(220px, 1fr);
}
.article-content p, .article-content li {
  color: var(--charcoal-muted);
  font-size: 1rem;
  font-weight: 300;
  line-height: 1.9;
}
.article-content p { margin-bottom: 18px; }
.article-content h2 { margin-top: 46px; }
.article-content ul { margin: 0 0 26px 22px; }
.article-content hr { border: 0; border-top: 1px solid var(--border); margin: 36px 0; }
.insight-card,
.takeaway-box {
  border: 1px solid var(--border);
  margin: 28px 0;
  padding: 24px 26px;
}
.insight-card h3,
.takeaway-box h3 {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 1.8px;
  line-height: 1.4;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.insight-card p:last-child,
.takeaway-box p:last-child { margin-bottom: 0; }
.insight-card.evidence {
  background: #eef4f6;
  border-color: #d3e0e5;
}
.insight-card.choice {
  background: #eef5ec;
  border-color: #d3dfce;
}
.insight-card.myth {
  background: #f0eeeb;
  border-color: #d9d2c9;
}
.takeaway-box {
  background: var(--white);
  border-left: 3px solid var(--amber);
}
.formula-grid,
.evidence-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 26px 0 34px;
}
.formula-card,
.evidence-card {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 22px;
}
.formula-card.positive { border-top: 3px solid #9fb894; }
.formula-card.negative { border-top: 3px solid #cfc8be; }
.formula-card strong,
.evidence-card strong {
  color: var(--charcoal);
  display: block;
  font-size: 0.76rem;
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  text-transform: uppercase;
}
.formula-card p,
.evidence-card p {
  font-size: 0.93rem;
  line-height: 1.7;
  margin-bottom: 0;
}
.faq-list {
  border-top: 1px solid var(--border);
  margin: 28px 0 42px;
}
.faq-list details {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}
.faq-list summary {
  color: var(--charcoal);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.4px;
  list-style: none;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  color: var(--amber);
  content: "+";
  float: right;
  font-size: 1.15rem;
}
.faq-list details[open] summary::after { content: "-"; }
.faq-list p { margin: 14px 0 0; }
.article-table {
  border-collapse: collapse;
  margin: 24px 0 34px;
  width: 100%;
}
.article-table th, .article-table td {
  border: 1px solid var(--border);
  font-size: 0.92rem;
  padding: 14px 16px;
  text-align: left;
}
.article-table th { background: var(--bg-warm); color: var(--charcoal); }
.side-note {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  padding: 28px;
  position: sticky;
  top: 104px;
}
.doc-card strong {
  color: var(--charcoal);
  display: block;
  font-size: 0.82rem;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.doc-card span { color: var(--charcoal-muted); display: block; font-weight: 300; }
.page-footer {
  border-top: 1px solid var(--border);
  color: var(--charcoal-muted);
  font-size: 0.8rem;
  padding: 32px 24px;
}

.cart-page-layout {
  align-items: start;
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(0, 1fr) 360px;
}
.cart-panel,
.cart-summary {
  background: var(--white);
  border: 1px solid var(--border);
}
.cart-panel-header,
.cart-row {
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(260px, 1fr) 120px 150px 120px;
}
.cart-panel-header {
  border-bottom: 1px solid var(--border);
  color: var(--charcoal-muted);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 1.6px;
  padding: 20px 24px;
  text-transform: uppercase;
}
.cart-row {
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding: 24px;
}
.cart-row:last-child { border-bottom: 0; }
.cart-product {
  align-items: center;
  display: grid;
  gap: 20px;
  grid-template-columns: 86px minmax(0, 1fr);
}
.cart-product img {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  display: block;
  height: 108px;
  object-fit: contain;
  padding: 9px;
  width: 86px;
}
.cart-product h2 {
  font-size: 1.45rem;
  margin-bottom: 6px;
}
.cart-product p,
.cart-price,
.cart-line-subtotal {
  color: var(--charcoal-muted);
  font-size: 0.92rem;
  font-weight: 300;
}
.cart-includes,
.cart-savings {
  display: block;
  font-size: 0.82rem;
  line-height: 1.6;
  margin-top: 8px;
}
.cart-includes {
  color: var(--charcoal-muted);
  font-weight: 300;
}
.cart-savings {
  color: var(--amber);
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.cart-line-subtotal {
  color: var(--charcoal);
  font-weight: 500;
}
.cart-quantity {
  align-items: center;
  border: 1px solid var(--border);
  display: inline-flex;
  height: 40px;
  width: max-content;
}
.cart-quantity button {
  background: var(--white);
  border: 0;
  color: var(--charcoal);
  cursor: pointer;
  font-size: 1rem;
  height: 38px;
  width: 38px;
}
.cart-quantity input {
  background: transparent;
  border: 0;
  color: var(--charcoal);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  height: 38px;
  text-align: center;
  width: 42px;
}
.cart-quantity input::-webkit-outer-spin-button,
.cart-quantity input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.cart-remove-line {
  background: transparent;
  border: 0;
  color: var(--charcoal-muted);
  cursor: pointer;
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  margin-top: 12px;
  text-transform: uppercase;
}
.cart-summary {
  padding: 28px;
  position: sticky;
  top: 96px;
}
.cart-summary h2 {
  font-size: 2rem;
  margin-bottom: 24px;
}
.cart-summary-row {
  align-items: center;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  padding: 15px 0;
}
.cart-summary-row span {
  color: var(--charcoal-muted);
  font-size: 0.84rem;
  letter-spacing: 1.3px;
  text-transform: uppercase;
}
.cart-summary-row strong {
  color: var(--charcoal);
  font-size: 1.05rem;
  font-weight: 500;
}
.cart-summary-row.total {
  border-bottom: 0;
  padding: 22px 0 26px;
}
.cart-summary-row.total strong { font-size: 1.35rem; }
.checkout-button,
.continue-button {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 1.8px;
  padding: 15px;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  width: 100%;
}
.checkout-button {
  background: var(--charcoal);
  border: 0;
  color: var(--white);
  cursor: pointer;
  margin-bottom: 12px;
}
.checkout-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}
.continue-button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--charcoal);
}
.cart-empty-state {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 46px;
}
.cart-empty-state p {
  color: var(--charcoal-muted);
  font-weight: 300;
  margin: 14px 0 26px;
}
.checkout-layout {
  align-items: start;
  display: grid;
  gap: 34px;
  grid-template-columns: minmax(0, 1fr) 380px;
}
.checkout-form-panel {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 34px;
}
.checkout-form-panel h2 { margin-bottom: 28px; }
.checkout-form {
  display: grid;
  gap: 18px;
}
.form-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.form-field.full { grid-column: 1 / -1; }
.form-field label {
  color: var(--charcoal-muted);
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
  text-transform: uppercase;
}
.form-field input,
.form-field textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--charcoal);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: 0;
  padding: 14px 16px;
  transition: border-color 0.25s ease, background 0.25s ease;
  width: 100%;
}
.form-field textarea {
  min-height: 118px;
  resize: vertical;
}
.form-field input:focus,
.form-field textarea:focus {
  background: var(--white);
  border-color: var(--amber);
}
.checkout-note {
  color: var(--charcoal-muted);
  font-size: 0.86rem;
  font-weight: 300;
  margin-top: 4px;
}
.summary-items {
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
  padding-bottom: 12px;
}
.summary-item {
  display: grid;
  gap: 12px;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  padding: 12px 0;
}
.summary-item img {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  height: 62px;
  object-fit: contain;
  padding: 6px;
  width: 52px;
}
.summary-item h3 {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 4px;
}
.summary-item p {
  color: var(--charcoal-muted);
  font-size: 0.78rem;
  font-weight: 300;
}
.summary-item .cart-savings {
  font-size: 0.72rem;
  margin-top: 4px;
}
.summary-item strong {
  color: var(--charcoal);
  font-size: 0.9rem;
  font-weight: 500;
}
.checkout-message {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  color: var(--charcoal-muted);
  font-size: 0.9rem;
  font-weight: 300;
  margin-top: 18px;
  padding: 16px;
}

@media (max-width: 760px) {
  .page-links { display: none; }
  .page-shell { padding: 72px 20px; }
  .article-grid, .doc-grid, .article-layout, .formula-grid, .evidence-grid, .cart-page-layout, .checkout-layout, .form-grid { grid-template-columns: 1fr; }
  .side-note { position: static; }
  .form-field.full { grid-column: auto; }
  .cart-panel-header { display: none; }
  .cart-row {
    gap: 18px;
    grid-template-columns: 1fr;
  }
  .cart-product { grid-template-columns: 78px minmax(0, 1fr); }
  .cart-product img {
    height: 98px;
    width: 78px;
  }
  .cart-price::before,
  .cart-line-subtotal::before {
    color: var(--charcoal-muted);
    display: block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 1.4px;
    margin-bottom: 4px;
    text-transform: uppercase;
  }
  .cart-price::before { content: "Price"; }
  .cart-line-subtotal::before { content: "Subtotal"; }
  .cart-summary { position: static; }
}