/* ===== Clinical Skin Nutrition — V3 Presell ===== */

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

:root {
  --csn-teal: #1a5c5c;
  --csn-mint: #e8f5f0;
  --csn-gold: #c9953d;
  --csn-white: #fff;
  --csn-charcoal: #222;
  --csn-muted: #6b7b7b;
  --csn-border: #d5e0dc;
  --csn-radius: 8px;
  --csn-max-w: 740px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: 'Outfit', sans-serif;
  color: var(--csn-charcoal);
  background: var(--csn-white);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--csn-teal); text-decoration: none; }

/* --- Typography --- */
h1, h2, h3, h4 { font-family: 'Crimson Pro', serif; font-weight: 600; line-height: 1.3; color: var(--csn-charcoal); }
h1 { font-size: 2rem; }
h2 { font-size: 1.55rem; margin-bottom: 0.6em; }
h3 { font-size: 1.25rem; margin-bottom: 0.45em; }
p { margin-bottom: 1em; }

/* --- Layout --- */
.csn-wrap {
  max-width: var(--csn-max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Sponsored Bar --- */
.csn-sponsored-bar {
  background: var(--csn-mint);
  border-bottom: 1px solid var(--csn-border);
  padding: 8px 0;
  text-align: center;
  font-size: 0.78rem;
  color: var(--csn-muted);
  letter-spacing: 0.03em;
}
.csn-sponsored-bar span { margin: 0 6px; }

/* --- Header --- */
.csn-header {
  padding: 22px 0 18px;
  border-bottom: 2px solid var(--csn-teal);
}
.csn-header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.csn-brand {
  font-family: 'Crimson Pro', serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--csn-teal);
  letter-spacing: 0.02em;
}
.csn-editorial-badge {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--csn-muted);
  border: 1px solid var(--csn-border);
  padding: 3px 10px;
  border-radius: 3px;
}

/* --- Hero --- */
.csn-hero {
  padding: 44px 0 36px;
  text-align: center;
}
.csn-hero h1 { margin-bottom: 14px; }
.csn-hero-sub {
  font-size: 1.05rem;
  color: var(--csn-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* --- Sections --- */
.csn-section {
  padding: 38px 0;
}
.csn-section--mint {
  background: var(--csn-mint);
}
.csn-section--border-top {
  border-top: 1px solid var(--csn-border);
}

.csn-section-label {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--csn-teal);
  margin-bottom: 10px;
  font-weight: 600;
}

/* --- Cards --- */
.csn-card {
  background: var(--csn-white);
  border: 1px solid var(--csn-border);
  border-left: 4px solid var(--csn-teal);
  border-radius: var(--csn-radius);
  padding: 22px 24px;
  margin-bottom: 18px;
}
.csn-card h3 {
  color: var(--csn-teal);
}
.csn-card p:last-child { margin-bottom: 0; }

/* --- Blockquote --- */
.csn-quote {
  border-left: 3px solid var(--csn-gold);
  padding: 16px 20px;
  margin: 22px 0;
  background: #fdfaf4;
  border-radius: 0 var(--csn-radius) var(--csn-radius) 0;
  font-family: 'Crimson Pro', serif;
  font-size: 1.08rem;
  font-style: italic;
  color: #3d3d3d;
}
.csn-quote-cite {
  display: block;
  margin-top: 8px;
  font-style: normal;
  font-family: 'Outfit', sans-serif;
  font-size: 0.78rem;
  color: var(--csn-muted);
}

/* --- Nutrient Grid --- */
.csn-nutrient-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}
.csn-nutrient-item {
  background: var(--csn-white);
  border: 1px solid var(--csn-border);
  border-radius: var(--csn-radius);
  padding: 20px;
  text-align: center;
}
.csn-nutrient-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--csn-mint);
  color: var(--csn-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
  font-family: 'Crimson Pro', serif;
  font-weight: 700;
  font-size: 0.85rem;
}
.csn-nutrient-item h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}
.csn-nutrient-item p {
  font-size: 0.88rem;
  color: var(--csn-muted);
  margin-bottom: 0;
}

/* --- Product Intro --- */
.csn-product-intro {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  margin-top: 20px;
}
.csn-product-img {
  flex: 0 0 220px;
}
.csn-product-img img {
  border-radius: var(--csn-radius);
}
.csn-product-details { flex: 1; }
.csn-product-details ul {
  list-style: none;
  padding: 0;
  margin: 12px 0;
}
.csn-product-details ul li {
  padding: 4px 0 4px 22px;
  position: relative;
  font-size: 0.92rem;
}
.csn-product-details ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  background: var(--csn-gold);
  border-radius: 50%;
}

/* --- Who Section --- */
.csn-who-list {
  list-style: none;
  padding: 0;
}
.csn-who-list li {
  padding: 10px 0 10px 28px;
  position: relative;
  border-bottom: 1px solid var(--csn-border);
  font-size: 0.94rem;
}
.csn-who-list li:last-child { border-bottom: none; }
.csn-who-list li::before {
  content: '\2713';
  position: absolute;
  left: 0;
  color: var(--csn-teal);
  font-weight: 700;
}

/* --- Offer --- */
.csn-offer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 26px 0 22px;
}
.csn-offer-card {
  background: var(--csn-white);
  border: 2px solid var(--csn-border);
  border-radius: var(--csn-radius);
  padding: 18px 14px;
  text-align: center;
  position: relative;
  transition: border-color 0.2s;
}
.csn-offer-card:hover {
  border-color: var(--csn-teal);
}
.csn-offer-card--featured {
  border-color: var(--csn-gold);
}
.csn-offer-badge {
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--csn-gold);
  color: var(--csn-white);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 3px 12px;
  border-radius: 20px;
  white-space: nowrap;
}
.csn-offer-card img {
  max-height: 170px;
  margin: 10px auto 14px;
  object-fit: contain;
}
.csn-offer-qty {
  font-family: 'Crimson Pro', serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--csn-charcoal);
  margin-bottom: 2px;
}
.csn-offer-price {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--csn-teal);
}
.csn-offer-price small {
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--csn-muted);
  display: block;
}
.csn-offer-total {
  font-size: 0.82rem;
  color: var(--csn-muted);
  margin: 4px 0 14px;
}
.csn-offer-btn {
  display: inline-block;
  width: 100%;
  padding: 11px 0;
  background: var(--csn-gold);
  color: var(--csn-white);
  border: none;
  border-radius: 6px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: background 0.2s;
}
.csn-offer-btn:hover {
  background: #b5842f;
  color: var(--csn-white);
}

/* --- Guarantee Box --- */
.csn-guarantee {
  background: #fdfaf4;
  border: 1px solid var(--csn-gold);
  border-radius: var(--csn-radius);
  padding: 20px 24px;
  text-align: center;
  margin-top: 10px;
}
.csn-guarantee-title {
  font-family: 'Crimson Pro', serif;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--csn-gold);
  margin-bottom: 6px;
}
.csn-guarantee p {
  font-size: 0.88rem;
  color: var(--csn-muted);
  margin-bottom: 0;
}

/* --- CTA Section --- */
.csn-cta-section {
  text-align: center;
  padding: 36px 0;
}
.csn-cta-btn {
  display: inline-block;
  padding: 15px 48px;
  background: var(--csn-gold);
  color: var(--csn-white);
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 6px;
  transition: background 0.2s;
}
.csn-cta-btn:hover {
  background: #b5842f;
  color: var(--csn-white);
}
.csn-cta-sub {
  display: block;
  font-size: 0.78rem;
  color: var(--csn-muted);
  margin-top: 10px;
}

/* --- FAQ --- */
.csn-faq-item {
  border-bottom: 1px solid var(--csn-border);
}
.csn-faq-item:first-child {
  border-top: 1px solid var(--csn-border);
}
.csn-faq-item summary {
  padding: 16px 32px 16px 0;
  font-family: 'Crimson Pro', serif;
  font-size: 1.08rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  list-style: none;
  color: var(--csn-charcoal);
}
.csn-faq-item summary::-webkit-details-marker { display: none; }
.csn-faq-item summary::after {
  content: '+';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: var(--csn-teal);
  font-weight: 400;
  transition: transform 0.2s;
}
.csn-faq-item[open] summary::after {
  content: '\2212';
}
.csn-faq-answer {
  padding: 0 0 18px;
  font-size: 0.92rem;
  color: var(--csn-muted);
  line-height: 1.65;
}
.csn-faq-answer p { margin-bottom: 0; }

/* --- References --- */
.csn-references {
  padding: 32px 0 24px;
  border-top: 1px solid var(--csn-border);
}
.csn-references h2 {
  font-size: 1.15rem;
  margin-bottom: 14px;
}
.csn-ref-list {
  list-style: none;
  padding: 0;
  counter-reset: refcount;
}
.csn-ref-list li {
  counter-increment: refcount;
  padding: 5px 0 5px 30px;
  position: relative;
  font-size: 0.78rem;
  color: var(--csn-muted);
  line-height: 1.55;
}
.csn-ref-list li::before {
  content: '[' counter(refcount) ']';
  position: absolute;
  left: 0;
  font-weight: 600;
  color: var(--csn-teal);
}

/* --- Disclaimers --- */
.csn-disclaimers {
  background: #f7f9f8;
  padding: 32px 0;
  border-top: 1px solid var(--csn-border);
}
.csn-disclaimer-block {
  margin-bottom: 16px;
  font-size: 0.78rem;
  color: var(--csn-muted);
  line-height: 1.6;
}
.csn-disclaimer-block:last-child { margin-bottom: 0; }
.csn-disclaimer-block strong {
  display: block;
  margin-bottom: 3px;
  color: var(--csn-charcoal);
  font-size: 0.8rem;
}

/* --- Footer --- */
.csn-footer {
  padding: 28px 0;
  text-align: center;
  border-top: 1px solid var(--csn-border);
  font-size: 0.76rem;
  color: var(--csn-muted);
  line-height: 1.7;
}
.csn-footer p { margin-bottom: 8px; }
.csn-footer-links {
  margin-top: 10px;
}
.csn-footer-links a {
  color: var(--csn-muted);
  margin: 0 8px;
  text-decoration: underline;
  font-size: 0.76rem;
}
.csn-footer-links a:hover {
  color: var(--csn-teal);
}

/* ===== Mobile ===== */
@media (max-width: 640px) {
  h1 { font-size: 1.55rem; }
  h2 { font-size: 1.3rem; }

  .csn-hero { padding: 30px 0 24px; }

  .csn-nutrient-grid {
    grid-template-columns: 1fr;
  }

  .csn-product-intro {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .csn-product-img {
    flex: none;
    width: 180px;
  }
  .csn-product-details ul li { text-align: left; }

  .csn-offer-grid {
    grid-template-columns: 1fr;
    max-width: 340px;
    margin-left: auto;
    margin-right: auto;
  }

  .csn-cta-btn {
    padding: 14px 32px;
    font-size: 0.94rem;
  }

  .csn-section { padding: 28px 0; }
}