/* ============================================
   Pettides Rx — clinical / chemical-label design system
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,500;0,600;0,700;1,600&family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --cream: #fafafa;
  --cream-deep: #f2f2f3;
  --ink: #16151a;
  --ink-soft: #58595f;
  --forest: #9c141f;
  --forest-deep: #0f0e12;
  --sage: #8b8d92;
  --amber: #b31626;
  --amber-soft: #e7b8bc;
  --line: #e1e1e4;
  --white: #ffffff;

  --red: #b31626;
  --red-deep: #7c0f1c;
  --red-bright: #d61f30;
  --silver: #c9cbce;
  --silver-deep: #9a9da3;
  --silver-light: #eef0f1;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --radius: 14px;
  --radius-lg: 26px;
  --shadow-soft: 0 20px 60px -30px rgba(16, 15, 18, 0.4);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle, rgba(16,15,18,0.05) 1px, transparent 1.4px) 0 0/26px 26px,
    var(--cream);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Chemical-code / seal motifs ---------- */
.lot-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.seal {
  position: relative;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  border: 1.5px solid var(--red);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: radial-gradient(circle at 35% 30%, #fff, var(--cream-deep));
}

.seal::before {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  border: 1px dashed var(--silver-deep);
}

.seal-inner {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--red-bright), var(--red-deep));
  color: var(--white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 9px;
  letter-spacing: 0.05em;
  line-height: 1.3;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.25);
}

.molecule-divider {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--silver-deep);
}

.molecule-divider .bond {
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, var(--silver-deep), var(--red));
}

.molecule-divider .atom {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--red);
  flex-shrink: 0;
}

h1, h2, h3, .display {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--forest-deep);
  margin: 0;
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 28px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--red);
  font-weight: 600;
}

.eyebrow::before {
  content: '';
  width: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--silver-deep), var(--silver));
  border-radius: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 30px;
  border-radius: 999px;
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.35s var(--ease);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--red-bright), var(--red-deep));
  color: var(--white);
  box-shadow: 0 14px 30px -14px rgba(124, 15, 28, 0.65);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 36px -14px rgba(124, 15, 28, 0.7);
}

.btn-ghost {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--ink);
  color: var(--white);
}

.btn-block {
  width: 100%;
}

.btn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* ---------- Top ribbon ---------- */
.top-ribbon {
  background: linear-gradient(90deg, var(--red-deep), var(--red-bright), var(--red-deep));
  color: var(--white);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  font-weight: 600;
  padding: 8px 12px;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid;
  border-image: linear-gradient(90deg, var(--red) 0%, var(--silver) 50%, var(--red) 100%) 1;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 600;
  color: var(--forest-deep);
}

.logo-mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.logo-img {
  height: 46px;
  width: auto;
  display: block;
  mix-blend-mode: multiply;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--ink-soft);
}

.nav-links a {
  transition: color 0.25s ease;
}

.nav-links a:hover {
  color: var(--forest-deep);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-price {
  font-size: 13.5px;
  color: var(--ink-soft);
}

.nav-price strong {
  color: var(--forest-deep);
}

.btn-sm {
  padding: 11px 22px;
  font-size: 13.5px;
}

@media (max-width: 760px) {
  .nav-links { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 60px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 60px;
  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(38px, 5vw, 60px);
  line-height: 1.04;
  margin: 18px 0 22px;
}

.hero-copy .accent {
  color: var(--amber);
  font-style: italic;
}

.hero-sub {
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 460px;
  margin-bottom: 34px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.hero-price {
  display: flex;
  flex-direction: column;
  font-size: 13px;
  color: var(--ink-soft);
}

.hero-price strong {
  font-size: 20px;
  color: var(--forest-deep);
  font-family: var(--font-serif);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.badge {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
  color: var(--ink-soft);
  font-weight: 500;
}

.badge svg {
  width: 18px;
  height: 18px;
  color: var(--forest);
  flex-shrink: 0;
}

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

.hero-visual-ring {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 420px;
  height: 420px;
  max-width: 90%;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    repeating-conic-gradient(from 0deg, rgba(179,22,38,0.05) 0deg 2deg, transparent 2deg 12deg),
    radial-gradient(circle at 30% 25%, #ffffff 0%, var(--cream-deep) 55%, var(--amber-soft) 130%);
  box-shadow: inset 0 0 0 1px var(--line), inset 0 0 0 8px rgba(255,255,255,0.6);
  border: 1px solid var(--silver);
}

.hero-photo-wrap {
  position: relative;
  width: 100%;
  max-width: 440px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  aspect-ratio: 4/5;
}

.hero-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-photo-wrap-bottle {
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 36px;
}

.hero-bottle-photo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.hero-seal {
  position: absolute;
  top: 18px;
  left: 18px;
  filter: drop-shadow(0 10px 20px rgba(16, 15, 18, 0.25));
}

.hero-seal .seal {
  width: 84px;
  height: 84px;
}

.hero-seal .seal-inner {
  width: 56px;
  height: 56px;
  font-size: 7.5px;
}

.hero-strip {
  margin-top: 68px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 600;
}

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }

/* ---------- Section shell ---------- */
section {
  padding: 96px 0;
}

.section-head {
  max-width: 620px;
  margin-bottom: 56px;
}

.section-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  margin-top: 14px;
}

.section-head p {
  color: var(--ink-soft);
  font-size: 16.5px;
  margin-top: 14px;
}

.section-alt {
  background: var(--white);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-dark {
  position: relative;
  background: var(--forest-deep);
  color: var(--cream);
  background-image:
    radial-gradient(circle at 15% 20%, rgba(179,22,38,0.16) 0%, transparent 40%),
    radial-gradient(circle at 85% 80%, rgba(201,203,206,0.08) 0%, transparent 40%);
  border-top: 1px solid rgba(201,203,206,0.15);
}

.section-dark h2, .section-dark h3 {
  color: var(--cream);
}

.section-dark .section-head p {
  color: #a9abb0;
}

/* ---------- Problem / benefit ---------- */
.benefit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.benefit-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.benefit-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-soft);
}

.benefit-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: linear-gradient(160deg, var(--silver-light), var(--cream-deep));
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--red);
}

.benefit-card {
  position: relative;
}

.benefit-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 26px;
  right: 26px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--red), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.benefit-card:hover::before {
  opacity: 1;
}

.benefit-icon svg {
  width: 24px;
  height: 24px;
}

.benefit-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.benefit-card p {
  color: var(--ink-soft);
  font-size: 15px;
}

/* ---------- How it works ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  position: relative;
}

.step {
  position: relative;
}

.step-num {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--amber);
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-weight: 600;
}

.step-num::after {
  content: '';
  height: 1px;
  flex: 1;
  background: var(--line);
}

.step h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.step p {
  color: var(--ink-soft);
  font-size: 15px;
}

/* ---------- Science / ingredient section ---------- */
.science-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

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

.science-visual svg {
  width: 100%;
  max-width: 340px;
}

.compound-card {
  width: 100%;
  max-width: 420px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-soft);
}

.compound-card img {
  width: 100%;
  border-radius: 6px;
}

.ingredient-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
  margin-top: 28px;
}

.ingredient-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.ingredient-row .name {
  font-family: var(--font-serif);
  font-size: 17px;
}

.ingredient-row .amount {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--silver);
  letter-spacing: 0.04em;
}

.composition-note {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: #8d8f95;
}

.product-tagline {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--red-deep);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: -6px 0 16px;
}

/* ---------- Supplement facts & usage ---------- */
.facts-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: stretch;
  margin-bottom: 40px;
}

.facts-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-soft);
  display: flex;
}

.facts-card-img {
  width: 100%;
  display: block;
}

.usage-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
}

.usage-col {
  padding: 26px 22px;
}

.usage-col:first-child {
  border-right: 1px solid var(--line);
}

.usage-tag {
  display: inline-block;
  background: var(--red);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.usage-icon-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.usage-icon-row svg:first-child {
  width: 46px;
  height: 28px;
}

.usage-icon-row svg:last-child {
  width: 22px;
  height: 22px;
}

.usage-dose {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
}

.usage-dose strong {
  color: var(--ink);
  font-size: 16px;
}

.usage-copy {
  font-size: 14.5px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.usage-icons-mini {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.usage-icons-mini span {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--ink-soft);
}

.usage-icons-mini svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.usage-dietary {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.disclaimer-banner {
  border: 1.5px solid var(--red);
  border-radius: 999px;
  text-align: center;
  padding: 14px 24px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--red-deep);
  background: rgba(179, 22, 38, 0.04);
  margin-bottom: 28px;
}

.disclaimer-banner span {
  color: var(--silver-deep);
  margin: 0 4px;
}

.storage-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  text-align: center;
}

/* ---------- Product / buy panel ---------- */
.product {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: center;
}

.product-visual {
  position: relative;
  background:
    radial-gradient(circle at 20% 15%, rgba(179,22,38,0.05), transparent 45%),
    var(--cream-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-visual svg {
  width: 100%;
  max-width: 260px;
}

.product-label-img {
  width: 100%;
  max-width: 320px;
  filter: drop-shadow(0 20px 40px rgba(16, 15, 18, 0.18));
}

.product-panel h2 {
  font-size: clamp(28px, 3.2vw, 36px);
  margin-bottom: 12px;
}

.stars {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--amber);
  font-size: 14px;
}

.stars svg {
  width: 16px;
  height: 16px;
}

.product-desc {
  color: var(--ink-soft);
  font-size: 16px;
  margin-bottom: 26px;
  max-width: 480px;
}

.price-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 26px;
}

.price-now {
  font-family: var(--font-serif);
  font-size: 38px;
  color: var(--forest-deep);
}

.price-was {
  font-size: 17px;
  color: var(--ink-soft);
  text-decoration: line-through;
}

.price-note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--red-deep);
  font-weight: 700;
  background: rgba(179, 22, 38, 0.08);
  border: 1px solid rgba(179, 22, 38, 0.2);
  padding: 4px 10px;
  border-radius: 999px;
}

.check-list {
  list-style: none;
  padding: 0;
  margin: 0 0 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--ink);
}

.check-list svg {
  width: 18px;
  height: 18px;
  color: var(--forest);
  flex-shrink: 0;
  margin-top: 2px;
}

.buy-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  background: var(--white);
}

.qty-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.qty-label {
  font-size: 13.5px;
  color: var(--ink-soft);
  font-weight: 600;
}

.qty-control {
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.qty-control button {
  width: 36px;
  height: 36px;
  border: none;
  background: var(--cream);
  cursor: pointer;
  font-size: 17px;
  color: var(--forest-deep);
}

.qty-control span {
  width: 34px;
  text-align: center;
  font-weight: 600;
  font-size: 14.5px;
}

.buy-total {
  font-size: 13.5px;
  color: var(--ink-soft);
  margin-bottom: 18px;
}

.buy-total strong {
  color: var(--forest-deep);
  font-size: 15px;
}

.trust-row {
  display: flex;
  gap: 14px;
  margin-top: 16px;
  font-size: 12px;
  color: var(--ink-soft);
  align-items: center;
  flex-wrap: wrap;
}

.trust-row span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.trust-row svg {
  width: 14px;
  height: 14px;
}

#checkout-error {
  display: none;
  color: var(--red-deep);
  font-size: 13.5px;
  margin-top: 12px;
}

/* ---------- FAQ ---------- */
.faq {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-q {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--forest-deep);
}

.faq-q .plus {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  position: relative;
}

.faq-q .plus::before,
.faq-q .plus::after {
  content: '';
  position: absolute;
  background: var(--forest-deep);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.faq-q .plus::before { width: 14px; height: 2px; }
.faq-q .plus::after { width: 2px; height: 14px; transition: transform 0.3s var(--ease); }

.faq-item.open .plus::after { transform: translate(-50%, -50%) rotate(90deg) scaleY(0); }

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease);
}

.faq-a p {
  padding-bottom: 22px;
  color: var(--ink-soft);
  font-size: 15px;
  max-width: 600px;
}

/* ---------- Final CTA ---------- */
.final-cta {
  text-align: center;
  padding: 110px 0;
}

.final-cta h2 {
  font-size: clamp(30px, 4vw, 46px);
  margin-bottom: 20px;
}

.final-cta p {
  color: var(--ink-soft);
  font-size: 17px;
  max-width: 480px;
  margin: 0 auto 36px;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  padding: 44px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--ink-soft);
}

.footer-links {
  display: flex;
  gap: 22px;
}

/* ---------- Sticky mobile buy bar ---------- */
.sticky-buy {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  background: var(--white);
  border-top: 1px solid var(--line);
  padding: 14px 20px;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  transform: translateY(100%);
  transition: transform 0.4s var(--ease);
  box-shadow: 0 -12px 30px -20px rgba(0,0,0,0.3);
}

.sticky-buy.show {
  transform: translateY(0);
}

.sticky-buy .price-now {
  font-size: 22px;
}

@media (max-width: 900px) {
  .hero-grid, .science-grid, .product { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .benefit-grid, .steps { grid-template-columns: 1fr; }
  .facts-grid, .usage-card { grid-template-columns: 1fr; }
  .usage-col:first-child { border-right: none; border-bottom: 1px solid var(--line); }
  .sticky-buy { display: flex; }
  body { padding-bottom: 78px; }
}

@media (max-width: 600px) {
  .hero { padding-top: 56px; }
  section { padding: 68px 0; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
}