/* ── TOKENS ── */
:root {
  --mint: #3ECFA2;
  --mint-dark: #2BA87C;
  --mint-pale: #E8FAF4;
  --green-deep: #1A3C34;
  --cream: #F9F8F5;
  --warm-white: #FDFCFA;
  --sand: #EDE8E0;
  --sand-dark: #D9D2C7;
  --sage: #7BA59B;
  --fg: #1A2E28;
  --fg-muted: #5C7A72;
  --accent: #E8824A;
  --accent-dark: #C96A2E;
  --white: #FFFFFF;
  --shadow-sm: 0 2px 12px rgba(26, 60, 52, 0.08);
  --shadow-md: 0 6px 32px rgba(26, 60, 52, 0.12);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 999px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--cream);
  color: var(--fg);
  font-family: 'DM Sans', system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── HEADER ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(249, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--sand);
}

.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 14px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: 'DM Sans', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--green-deep);
  text-decoration: none;
  letter-spacing: -0.3px;
}

nav {
  display: flex;
  gap: 32px;
}

nav a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

nav a:hover { color: var(--mint-dark); }

/* ── HERO ── */
.hero {
  background: var(--warm-white);
  padding: 96px 40px 88px;
}

.hero-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mint-dark);
  margin-bottom: 20px;
}

.hero h1 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(40px, 4.5vw, 60px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--green-deep);
  margin-bottom: 24px;
  letter-spacing: -1.5px;
}

.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: 36px;
  max-width: 480px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
}

.tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--mint-pale);
  border: 1px solid rgba(62, 207, 162, 0.25);
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  color: var(--mint-dark);
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  padding: 13px 28px;
  background: var(--mint);
  color: var(--green-deep);
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-full);
  text-decoration: none;
  transition: background 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 16px rgba(62, 207, 162, 0.35);
}

.btn-primary:hover {
  background: var(--mint-dark);
  box-shadow: 0 6px 24px rgba(62, 207, 162, 0.45);
}

.btn-secondary {
  display: inline-block;
  padding: 13px 28px;
  background: transparent;
  color: var(--fg-muted);
  font-weight: 500;
  font-size: 15px;
  border-radius: var(--radius-full);
  text-decoration: none;
  border: 1.5px solid var(--sand-dark);
  transition: border-color 0.2s, color 0.2s;
}

.btn-secondary:hover {
  border-color: var(--mint);
  color: var(--mint-dark);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image {
  width: 100%;
  max-width: 520px;
  border-radius: var(--radius-lg);
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

/* ── SHARED SECTION ── */
.section-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
}

.section-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mint-dark);
  margin-bottom: 16px;
}

.section-inner h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(28px, 3.5vw, 44px);
  line-height: 1.15;
  font-weight: 700;
  color: var(--green-deep);
  letter-spacing: -0.8px;
  max-width: 620px;
  margin-bottom: 56px;
}

/* ── HOW IT WORKS / SCIENCE ── */
#supplements, #toothpaste, #accessories, #rinses, #specialty-paste, #science {
  padding: 96px 0;
}

/* Products Section */
.products {
  padding: 96px 0;
  background: var(--warm-white);
}

.products-header {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--white);
  border: 1.5px solid var(--sand);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: box-shadow 0.2s, border-color 0.2s;
  text-decoration: none;
  color: inherit;
}

.product-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--mint);
}

.product-icon {
  width: 52px;
  height: 52px;
  background: var(--mint-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}

.product-icon svg { color: var(--mint-dark); }

.product-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}

.product-card p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
  flex: 1;
}

.product-card .price {
  font-size: 16px;
  font-weight: 600;
  color: var(--mint-dark);
  margin-top: 8px;
}

/* ── FEATURES ── */
.features {
  padding: 96px 0;
  background: var(--cream);
}

.features h2 {
  margin-bottom: 48px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--sand);
  border: 1.5px solid var(--sand);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.feature-card {
  background: var(--cream);
  padding: 36px 32px;
  transition: background 0.2s;
}

.feature-card:hover { background: var(--white); }

.feature-icon {
  color: var(--mint-dark);
  margin-bottom: 20px;
  opacity: 0.85;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ── SCIENCE SECTION ── */
.science-section {
  padding: 96px 0;
  background: var(--cream);
}

.science-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
}

.science-header { margin-bottom: 64px; }

.science-header .section-kicker { color: var(--accent); }

.science-header h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(30px, 3.5vw, 48px);
  font-weight: 700;
  color: var(--green-deep);
  letter-spacing: -0.8px;
  line-height: 1.1;
  margin-bottom: 20px;
  max-width: 600px;
}

.science-header p {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 520px;
}

.science-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.science-pillar {
  background: var(--white);
  border: 1.5px solid var(--sand);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
}

.science-pillar-icon {
  width: 56px;
  height: 56px;
  background: var(--mint-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.science-pillar-icon svg { color: var(--mint-dark); }

.science-pillar h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 12px;
}

.science-pillar p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

.science-cta {
  margin-top: 56px;
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
}

.science-cta span {
  font-size: 14px;
  color: var(--fg-muted);
  font-weight: 500;
}

/* ── OPTIMIZE EVERYTHING ── */
.optimize {
  padding: 96px 0;
  background: var(--green-deep);
}

.optimize-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
}

.optimize-header { margin-bottom: 64px; }

.optimize-header h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(30px, 3.5vw, 48px);
  font-weight: 700;
  color: var(--cream);
  letter-spacing: -0.8px;
  line-height: 1.1;
  margin-bottom: 20px;
  max-width: 580px;
}

.optimize-header p {
  font-size: 17px;
  color: #8BBAA8;
  line-height: 1.7;
  max-width: 520px;
}

.optimize-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.optimize-card {
  background: rgba(255,255,255,0.06);
  border: 1.5px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
}

.optimize-card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.optimize-card--health .optimize-card-tag {
  background: rgba(62, 207, 162, 0.15);
  color: var(--mint);
}

.optimize-card--appearance .optimize-card-tag {
  background: rgba(232, 130, 74, 0.2);
  color: #F0A878;
}

.optimize-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}

.optimize-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.optimize-card li {
  font-size: 15px;
  color: #8BBAA8;
  padding-left: 20px;
  position: relative;
  line-height: 1.5;
}

.optimize-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.optimize-card--health li::before { background: var(--mint); }
.optimize-card--appearance li::before { background: var(--accent); }

.optimize-card li strong { color: var(--cream); }

/* ── SCIENCE / PHILOSOPHY ── */
.philosophy {
  padding: 96px 0;
  background: var(--green-deep);
}

.philosophy-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 56px;
  align-items: start;
}

.philosophy-mark svg { display: block; }

.philosophy-content { padding-top: 4px; }

.philosophy-content h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(26px, 3vw, 40px);
  line-height: 1.2;
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 24px;
  letter-spacing: -0.5px;
  max-width: 520px;
}

.philosophy-content p {
  font-size: 16px;
  color: #8BBAA8;
  line-height: 1.75;
  max-width: 560px;
}

.philosophy-content p + p { margin-top: 14px; }

/* ── CLOSING ── */
.closing {
  padding: 96px 0;
  background: var(--warm-white);
  text-align: center;
}

.closing-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 40px;
}

.closing h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(30px, 3.5vw, 48px);
  line-height: 1.1;
  font-weight: 700;
  color: var(--green-deep);
  letter-spacing: -0.8px;
  margin-bottom: 24px;
}

.closing p {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ── FOOTER ── */
footer {
  padding: 48px 0;
  background: var(--sand);
  border-top: 1.5px solid var(--sand-dark);
}

.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
  text-align: center;
}

.footer-logo {
  font-family: 'DM Sans', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--green-deep);
  margin-bottom: 10px;
}

.footer-inner p {
  font-size: 14px;
  color: var(--fg-muted);
  margin-bottom: 8px;
}

.footer-note {
  font-size: 12px;
  color: var(--sage);
  letter-spacing: 0.05em;
}

/* ── WAITLIST FORMS ── */
.waitlist-form-wrap {
  margin-top: 12px;
}

.waitlist-label {
  font-size: 14px;
  color: var(--fg-muted);
  margin-bottom: 14px;
  line-height: 1.55;
  max-width: 420px;
}

.waitlist-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 440px;
}

.waitlist-input-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.waitlist-input {
  flex: 1;
  min-width: 0;
  padding: 12px 18px;
  border: 1.5px solid var(--sand-dark);
  border-radius: var(--radius-full);
  font-family: 'DM Sans', sans-serif;
  font-size: 15px;
  color: var(--fg);
  background: var(--white);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.waitlist-input:focus {
  border-color: var(--mint);
  box-shadow: 0 0 0 3px rgba(62, 207, 162, 0.15);
}

.waitlist-input::placeholder { color: var(--sage); }

.waitlist-btn {
  flex-shrink: 0;
  padding: 12px 24px;
  background: var(--mint);
  color: var(--green-deep);
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  font-size: 15px;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, opacity 0.2s;
  box-shadow: 0 4px 14px rgba(62, 207, 162, 0.3);
  white-space: nowrap;
}

.waitlist-btn:hover { background: var(--mint-dark); box-shadow: 0 6px 20px rgba(62, 207, 162, 0.4); }
.waitlist-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.waitlist-msg {
  font-size: 14px;
  font-weight: 500;
  min-height: 20px;
  padding: 2px 4px;
}

.waitlist-msg--success { color: var(--mint-dark); }
.waitlist-msg--error   { color: var(--accent-dark); }

/* ── WAITLIST BOTTOM SECTION ── */
.waitlist-section {
  padding: 96px 0;
  background: var(--mint-pale);
  border-top: 1.5px solid rgba(62, 207, 162, 0.2);
  border-bottom: 1.5px solid rgba(62, 207, 162, 0.2);
}

.waitlist-section-inner {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 40px;
}

.waitlist-section-inner h2 {
  font-family: 'DM Sans', sans-serif;
  font-size: clamp(30px, 3.5vw, 46px);
  font-weight: 700;
  color: var(--green-deep);
  letter-spacing: -0.8px;
  line-height: 1.1;
  margin-bottom: 16px;
  max-width: 100%;
}

.waitlist-section-lede {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
  margin-bottom: 32px;
  max-width: 560px;
}

.waitlist-form--centered {
  max-width: 100%;
}

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .hero-inner { gap: 48px; }
  .product-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .header-inner { padding: 14px 20px; }
  nav { gap: 20px; }
  nav a { font-size: 13px; }

  .hero { padding: 64px 20px 56px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-image { max-width: 100%; }
  .hero-lede { font-size: 17px; }

  .section-inner, .products-header, .philosophy-inner, .closing-inner, .science-inner, .optimize-inner {
    padding: 0 20px;
  }

  #supplements, #toothpaste, #accessories, #rinses, #specialty-paste, #science, .features, .philosophy, .closing, .products {
    padding: 72px 0;
  }

  .waitlist-section { padding: 72px 0; }
  .waitlist-section-inner { padding: 0 20px; }
  .waitlist-input-row { flex-direction: column; }
  .waitlist-btn { width: 100%; }

  .product-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .philosophy-inner { grid-template-columns: 1fr; gap: 28px; }
  .philosophy-mark svg { width: 44px; height: 44px; }
  .section-inner h2 { margin-bottom: 40px; }
  .science-pillars { grid-template-columns: 1fr; }
  .optimize-grid { grid-template-columns: 1fr; }
  .science-header h2, .optimize-header h2 { font-size: 26px; }
  .optimize-card { padding: 28px 24px; }
}

@media (max-width: 480px) {
  .site-header { border-bottom: none; }
  nav { gap: 14px; }
  h1 { font-size: 36px; }
  .hero-actions { flex-direction: column; }
  .tag { font-size: 12px; padding: 5px 11px; }
  .btn-primary, .btn-secondary { font-size: 14px; padding: 12px 22px; }
}

/* ── REFERRAL CARD ── */
.referral-card {
  background: var(--white);
  border: 1.5px solid var(--mint);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-top: 16px;
  max-width: 460px;
  box-shadow: 0 4px 20px rgba(62, 207, 162, 0.15);
  text-align: center;
}

.referral-card-header { text-align: center; }

.referral-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--mint-pale);
  border: 1px solid rgba(62, 207, 162, 0.3);
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mint-dark);
  margin-bottom: 14px;
}

.referral-position {
  font-size: 58px;
  font-weight: 700;
  color: var(--green-deep);
  letter-spacing: -2px;
  line-height: 1;
  margin-bottom: 4px;
}

.referral-position-label {
  font-size: 13px;
  color: var(--fg-muted);
  font-weight: 500;
}

.referral-divider {
  border: none;
  border-top: 1.5px solid var(--sand);
  margin: 24px 0;
}

.referral-body { text-align: left; }

.referral-cta {
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 4px;
}

.referral-sub {
  font-size: 13px;
  color: var(--fg-muted);
  margin-bottom: 16px;
}

.referral-link-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

.referral-input {
  flex: 1;
  padding: 10px 14px;
  border: 1.5px solid var(--sand-dark);
  border-radius: var(--radius-full);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  color: var(--fg);
  background: var(--cream);
  outline: none;
  min-width: 0;
}

.referral-copy-btn {
  flex-shrink: 0;
  padding: 10px 18px;
  background: var(--green-deep);
  color: var(--cream);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.2s;
}

.referral-copy-btn:hover { background: var(--mint-dark); color: var(--green-deep); }

.referral-copy-feedback {
  font-size: 12px;
  color: var(--mint-dark);
  font-weight: 500;
  min-height: 18px;
  margin-bottom: 14px;
}

.referral-share-btns { display: flex; gap: 8px; flex-wrap: wrap; }

.referral-share-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-family: 'DM Sans', sans-serif;
  font-size: 12px;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s;
}

.referral-share-btn:hover { opacity: 0.8; }

.referral-share-btn--twitter { background: #000; color: #fff; }
.referral-share-btn--sms { background: var(--sand); color: var(--fg); }
.referral-share-btn--email { background: var(--sand); color: var(--fg); }

/* ── SCIENCE PAGE ── */

/* Fonts: Instrument Serif (headings) + Satoshi (body) */
@import url('https://api.fontshare.com/v2/css?f[]=instrument-serif@400,700&f[]=satoshi@400,500,700&display=swap');

:root {
  --off-white: #faf9f7;
  --science-mint: #4db17a;
  --science-mint-dark: #2fa866;
  --science-mint-pale: #e6f7ef;
  --science-charcoal: #1a2e28;
  --science-muted: #5c7a72;
  --science-sand: #e8e3dc;
}

/* ── SCIENCE PAGE HEADER ── */
.sci-page-body { background: var(--off-white); }

/* ── SCI HERO ── */
.sci-hero {
  background: var(--off-white);
  padding: 96px 40px 80px;
  position: relative;
}

.sci-hero::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--science-mint) 0%, transparent 60%);
}

.sci-hero-inner {
  max-width: 1140px;
  margin: 0 auto;
}

.sci-hero-eyebrow {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--science-mint-dark);
  margin-bottom: 24px;
}

.sci-hero h1 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(40px, 5vw, 68px);
  line-height: 1.08;
  font-weight: 400;
  color: var(--green-deep);
  margin-bottom: 28px;
  max-width: 700px;
  letter-spacing: -1px;
}

.sci-hero-sub {
  font-family: 'Satoshi', system-ui, sans-serif;
  font-size: 19px;
  color: var(--science-muted);
  line-height: 1.65;
  max-width: 540px;
  margin-bottom: 48px;
}

.sci-hero-pillars {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.sci-pillar-tag {
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  font-weight: 600;
  color: var(--science-mint-dark);
  background: var(--science-mint-pale);
  border: 1.5px solid rgba(77, 177, 122, 0.25);
  border-radius: var(--radius-full);
  padding: 7px 16px;
}

.sci-molecule-line {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 48px;
  color: var(--science-sand);
}

.sci-molecule-line span {
  font-family: 'Satoshi', sans-serif;
  font-size: 20px;
}

/* ── SCI SECTION BASE ── */
.sci-section {
  padding: 96px 0;
  border-top: 1px solid var(--science-sand);
}

.sci-section--alt { background: var(--warm-white); }
.sci-section--dark { background: var(--green-deep); }
.sci-section--pale { background: var(--science-mint-pale); }

.sci-section-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 40px;
}

.sci-section-label {
  display: inline-block;
  font-family: 'Satoshi', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--science-mint-dark);
  margin-bottom: 20px;
}

.sci-section-label--light { color: #7fcea8; }

.sci-section h2 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(28px, 3.5vw, 46px);
  line-height: 1.1;
  font-weight: 400;
  color: var(--green-deep);
  margin-bottom: 20px;
  max-width: 600px;
  letter-spacing: -0.5px;
}

.sci-section--dark h2 { color: var(--cream); }

.sci-section-lede {
  font-family: 'Satoshi', sans-serif;
  font-size: 18px;
  color: var(--science-muted);
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 48px;
}

.sci-section--dark .sci-section-lede { color: #8bbaa8; }

/* ── TWO-COLUMN LAYOUT ── */
.sci-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.sci-two-col--wide { grid-template-columns: 1fr 1.4fr; }

/* ── SCI BODY COPY ── */
.sci-body {
  font-family: 'Satoshi', sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fg);
}

.sci-body p { margin-bottom: 18px; }
.sci-body p:last-child { margin-bottom: 0; }

.sci-body strong { color: var(--green-deep); font-weight: 700; }

.sci-body h3 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 22px;
  font-weight: 400;
  color: var(--green-deep);
  margin-bottom: 14px;
  line-height: 1.3;
}

.sci-body h4 {
  font-family: 'Satoshi', sans-serif;
  font-size: 15px;
  font-weight: 700;
  color: var(--green-deep);
  margin: 24px 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sci-section--dark .sci-body { color: #c8ddd8; }
.sci-section--dark .sci-body strong { color: var(--cream); }

/* ── CITATIONS ── */
.sci-citations {
  margin-top: 28px;
  padding: 20px 24px;
  background: rgba(255,255,255,0.5);
  border-left: 3px solid var(--science-mint);
  border-radius: 0 8px 8px 0;
}

.sci-cite {
  display: block;
  font-size: 12.5px;
  color: var(--science-muted);
  line-height: 1.5;
  margin-bottom: 8px;
  font-style: normal;
}

.sci-cite:last-child { margin-bottom: 0; }
.sci-cite sup {
  color: var(--science-mint-dark);
  font-weight: 700;
  margin-right: 4px;
}

/* ── CALLOUT BLOCKS ── */
.sci-callout {
  background: var(--cream);
  border: 1.5px solid var(--science-sand);
  border-radius: var(--radius-lg);
  padding: 32px 36px;
  margin-top: 40px;
}

.sci-callout--mint {
  background: var(--science-mint-pale);
  border-color: rgba(77, 177, 122, 0.3);
}

.sci-callout-label {
  font-family: 'Satoshi', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--science-mint-dark);
  margin-bottom: 14px;
}

.sci-callout h4 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 20px;
  font-weight: 400;
  color: var(--green-deep);
  margin-bottom: 12px;
  line-height: 1.3;
}

.sci-callout p {
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  color: var(--science-muted);
  line-height: 1.6;
  margin: 0;
}

.sci-stat {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 42px;
  font-weight: 400;
  color: var(--science-mint-dark);
  line-height: 1;
  margin-bottom: 8px;
}

.sci-stat-label {
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  color: var(--science-muted);
  line-height: 1.5;
}

/* ── MINERAL DIAGRAM (CSS-drawn) ── */
.mineral-diagram {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 32px 0;
}

.mineral-step {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border-radius: 10px;
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
}

.mineral-step--acid {
  background: rgba(232, 130, 74, 0.1);
  border: 1px solid rgba(232, 130, 74, 0.3);
  color: #c96a2e;
}

.mineral-step--hap {
  background: var(--science-mint-pale);
  border: 1px solid rgba(77, 177, 122, 0.3);
  color: var(--science-mint-dark);
}

.mineral-step--whole {
  background: rgba(77, 177, 122, 0.15);
  border: 1px solid rgba(77, 177, 122, 0.4);
  color: var(--green-deep);
  font-weight: 700;
}

.mineral-step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}

.mineral-step--acid .mineral-step-num { background: rgba(232,130,74,0.2); }
.mineral-step--hap .mineral-step-num { background: rgba(77,177,122,0.2); }
.mineral-step--whole .mineral-step-num { background: rgba(77,177,122,0.3); }

.mineral-arrow {
  text-align: center;
  font-size: 20px;
  color: var(--science-sand);
  padding: 4px 0;
}

/* ── AXIS DIAGRAM (CSS-drawn) ── */
.axis-diagram {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: var(--cream);
  border: 1.5px solid var(--science-sand);
  border-radius: 12px;
  overflow: hidden;
  margin: 32px 0;
}

.axis-node {
  padding: 20px 16px;
  text-align: center;
  font-family: 'Satoshi', sans-serif;
  border-right: 1px solid var(--science-sand);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.axis-node:last-child { border-right: none; }

.axis-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin: 0 auto 4px;
}

.axis-node--mouth .axis-icon { background: var(--science-mint-pale); }
.axis-node--transfer .axis-icon { background: rgba(232,130,74,0.1); }
.axis-node--gut .axis-icon { background: rgba(232,130,74,0.15); }
.axis-node--systemic .axis-icon { background: rgba(200,50,50,0.1); }

.axis-node-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--science-muted);
}

.axis-node-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--green-deep);
  line-height: 1.3;
}

.axis-node-desc {
  font-size: 11px;
  color: var(--science-muted);
  line-height: 1.4;
}

.axis-arrow-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0 4px;
  font-size: 14px;
  color: var(--science-muted);
  background: var(--cream);
  border-right: 1px solid var(--science-sand);
}

.axis-arrow-col:last-child { border-right: none; }

/* ── SCI CARD GRID ── */
.sci-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 0;
}

.sci-card {
  background: var(--cream);
  border: 1.5px solid var(--science-sand);
  border-radius: 12px;
  padding: 28px 28px;
}

.sci-card h4 {
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--science-muted);
  margin-bottom: 10px;
}

.sci-card h3 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 20px;
  font-weight: 400;
  color: var(--green-deep);
  margin-bottom: 12px;
  line-height: 1.3;
}

.sci-card p {
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  color: var(--science-muted);
  line-height: 1.65;
  margin: 0;
}

/* ── COMPARISON TABLE ── */
.sci-comparison {
  width: 100%;
  border-collapse: collapse;
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  margin-top: 28px;
}

.sci-comparison th {
  text-align: left;
  padding: 12px 16px;
  background: var(--cream);
  border-bottom: 2px solid var(--science-sand);
  font-weight: 700;
  color: var(--green-deep);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sci-comparison td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--science-sand);
  vertical-align: top;
  color: var(--fg);
  line-height: 1.5;
}

.sci-comparison tr:last-child td { border-bottom: none; }
.sci-comparison tr:hover td { background: var(--off-white); }

.sci-comparison .highlight { color: var(--science-mint-dark); font-weight: 600; }

/* ── CTA BLOCK ── */
.sci-cta {
  padding: 96px 0;
  background: var(--off-white);
  text-align: center;
  border-top: 1px solid var(--science-sand);
}

.sci-cta-inner {
  max-width: 620px;
  margin: 0 auto;
  padding: 0 40px;
}

.sci-cta h2 {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 400;
  color: var(--green-deep);
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.sci-cta-sub {
  font-family: 'Satoshi', sans-serif;
  font-size: 16px;
  color: var(--science-muted);
  line-height: 1.65;
  margin-bottom: 36px;
}

/* ── SCIENCE NAV (subtle) ── */
.sci-toc {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--science-sand);
  padding-bottom: 0;
}

.sci-toc a {
  font-family: 'Satoshi', sans-serif;
  font-size: 13px;
  font-weight: 500;
  color: var(--science-muted);
  text-decoration: none;
  padding: 12px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  margin-bottom: -1px;
}

.sci-toc a:hover, .sci-toc a.active {
  color: var(--science-mint-dark);
  border-bottom-color: var(--science-mint);
}

/* ── WAITLIST FORM (reused on science page) ── */
.sci-waitlist-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 480px;
  margin: 0 auto;
}

.sci-waitlist-input-row {
  display: flex;
  gap: 10px;
}

.sci-waitlist-input {
  flex: 1;
  padding: 13px 18px;
  border: 1.5px solid var(--sand-dark);
  border-radius: var(--radius-full);
  font-family: 'Satoshi', sans-serif;
  font-size: 15px;
  color: var(--fg);
  background: var(--white);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.sci-waitlist-input:focus {
  border-color: var(--science-mint);
  box-shadow: 0 0 0 3px rgba(77, 177, 122, 0.15);
}

.sci-waitlist-input::placeholder { color: var(--sage); }

.sci-waitlist-btn {
  flex-shrink: 0;
  padding: 13px 26px;
  background: var(--science-mint);
  color: var(--green-deep);
  font-family: 'Satoshi', sans-serif;
  font-weight: 700;
  font-size: 15px;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s, opacity 0.2s;
  box-shadow: 0 4px 14px rgba(77, 177, 122, 0.35);
  white-space: nowrap;
}

.sci-waitlist-btn:hover {
  background: var(--science-mint-dark);
  box-shadow: 0 6px 20px rgba(77, 177, 122, 0.45);
}

.sci-waitlist-btn:disabled { opacity: 0.6; cursor: not-allowed; }

.sci-waitlist-msg {
  font-family: 'Satoshi', sans-serif;
  font-size: 14px;
  font-weight: 500;
  min-height: 20px;
}

.sci-waitlist-msg--success { color: var(--science-mint-dark); }
.sci-waitlist-msg--error { color: var(--accent-dark); }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .sci-two-col { gap: 40px; }
  .axis-diagram { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sci-hero { padding: 72px 20px 56px; }
  .sci-section-inner { padding: 0 20px; }
  .sci-section { padding: 72px 0; }
  .sci-cta { padding: 72px 0; }
  .sci-cta-inner { padding: 0 20px; }

  .sci-two-col { grid-template-columns: 1fr; gap: 32px; }
  .sci-card-grid { grid-template-columns: 1fr; }
  .axis-diagram { grid-template-columns: 1fr; }
  .axis-node { border-right: none; border-bottom: 1px solid var(--science-sand); }
  .axis-node:last-child { border-bottom: none; }
  .sci-toc { gap: 16px; }
  .sci-waitlist-input-row { flex-direction: column; }
  .sci-waitlist-btn { width: 100%; }
}

@media (max-width: 480px) {
  .sci-hero h1 { font-size: 36px; }
  .sci-hero-pillars { gap: 8px; }
  .sci-section-lede { font-size: 16px; }
}