:root {
  --blue: #0a4f8f;
  --blue-dark: #073a69;
  --blue-soft: #e8f1f8;
  --gold: #c9a45c;
  --ink: #212121;
  --muted: #6b7280;
  --line: #dbe4ea;
  --white: #ffffff;
  --serif: Georgia, 'Times New Roman', serif;
  --sans: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: var(--sans); line-height: 1.6; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { cursor: pointer; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.announce { padding: 9px 20px; color: #fff; background: var(--blue); text-align: center; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.site-header { position: relative; z-index: 10; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.logo, .footer-logo { color: var(--blue); font-family: var(--serif); font-size: 28px; letter-spacing: .08em; }
.main-nav ul, .footer-col ul { display: flex; gap: 28px; margin: 0; padding: 0; list-style: none; }
.main-nav a { display: block; padding: 27px 0 24px; color: #343b43; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; border-bottom: 2px solid transparent; }
.main-nav a:hover, .main-nav a[aria-current='page'] { color: var(--blue); border-color: var(--gold); }
.header-actions { display: flex; align-items: center; gap: 20px; }
.bag { color: var(--blue); display: flex; }
.nav-toggle { display: none; width: 38px; height: 34px; padding: 7px; border: 0; background: transparent; }
.nav-toggle span { display: block; height: 2px; margin: 4px 0; background: var(--blue); transition: transform .2s, opacity .2s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.hero { min-height: 620px; display: flex; align-items: center; background: #dbeaf3 url('../img/serum/gallery-3.jpg') center/cover no-repeat; }
.hero-overlay { width: 100%; padding: 100px 0; background: linear-gradient(90deg, rgba(255,255,255,.96) 0%, rgba(255,255,255,.78) 42%, rgba(255,255,255,0) 75%); }
.hero-copy { max-width: 560px; }
.eyebrow { margin: 0 0 15px; color: var(--blue); font-size: 12px; font-weight: bold; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, h3, h4, p { margin-top: 0; }
h1, h2 { font-family: var(--serif); font-weight: normal; line-height: 1.12; }
h1 { max-width: 650px; margin-bottom: 20px; font-size: clamp(44px, 6vw, 76px); }
h2 { margin-bottom: 18px; font-size: clamp(34px, 4vw, 50px); }
h3 { margin-bottom: 8px; font-size: 17px; }
.hero-copy p:not(.eyebrow) { max-width: 460px; margin-bottom: 30px; color: #44515c; font-size: 17px; }
.btn { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 13px 25px; color: #fff; background: var(--blue); border: 1px solid var(--blue); font-size: 12px; font-weight: bold; letter-spacing: .1em; text-transform: uppercase; transition: background .2s, border-color .2s; }
.btn:hover { background: var(--blue-dark); border-color: var(--blue-dark); }
.btn-light { color: var(--blue); background: #fff; border-color: #fff; }
.btn-light:hover { color: #fff; background: var(--blue); border-color: var(--blue); }

.section { padding: 90px 0; }
.section-soft { background: var(--blue-soft); }
.section-heading { max-width: 620px; margin: 0 auto 45px; text-align: center; }
.section-heading p { color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature { padding: 28px 20px; text-align: center; border: 1px solid var(--line); background: #fff; }
.feature-icon { width: 42px; height: 42px; margin: 0 auto 16px; color: var(--blue); }
.feature p, .product-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; text-align: center; }
.trust { padding: 8px 25px; border-right: 1px solid #b9cedd; }
.trust:last-child { border-right: 0; }
.trust strong { display: block; margin-bottom: 5px; color: var(--blue); font-family: var(--serif); font-size: 22px; font-weight: normal; }
.trust span { color: var(--muted); font-size: 14px; }
.products-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.product-card { border: 1px solid var(--line); background: #fff; transition: transform .2s, box-shadow .2s; }
.product-card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(10,79,143,.12); }
.product-card-image { aspect-ratio: 1 / 1; overflow: hidden; background: var(--blue-soft); }
.product-card-image img { width: 100%; height: 100%; object-fit: cover; }
.product-card-body { padding: 24px; }
.product-card-body h3 { font-family: var(--serif); font-size: 24px; font-weight: normal; }
.product-meta { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-top: 20px; }
.price { color: var(--blue); font-weight: bold; }
.small-btn { padding: 10px 14px; font-size: 11px; }
.about-split, .contact-grid, .product-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; }
.about-split img { width: 100%; aspect-ratio: 1.15; object-fit: cover; }
.text-link { display: inline-block; margin-top: 12px; padding-bottom: 3px; color: var(--blue); border-bottom: 1px solid var(--gold); font-size: 12px; font-weight: bold; letter-spacing: .1em; text-transform: uppercase; }
.site-footer { color: #dceaf4; background: #083b68; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 50px; padding: 60px 0; }
.footer-logo { color: #fff; margin-bottom: 14px; }
.footer-brand p, .footer-col li { color: #b7cfdf; font-size: 14px; }
.footer-col h4 { margin: 0 0 16px; color: #fff; font-size: 12px; letter-spacing: .12em; text-transform: uppercase; }
.footer-col ul { display: block; }
.footer-col li { margin-bottom: 8px; }
.footer-col a:hover { color: #fff; }
.footer-bottom { padding: 17px 0; color: #9bb9cc; border-top: 1px solid rgba(255,255,255,.15); font-size: 12px; }
.wa-float { position: fixed; z-index: 20; right: 22px; bottom: 22px; width: 54px; height: 54px; display: grid; place-items: center; color: #fff; background: #1aaf5d; border-radius: 50%; box-shadow: 0 5px 18px rgba(0,0,0,.2); }

.page-hero { padding: 85px 0; background: var(--blue-soft); text-align: center; }
.page-hero h1 { max-width: 800px; margin: 0 auto 14px; font-size: clamp(42px, 5vw, 62px); }
.page-hero p { max-width: 650px; margin: auto; color: var(--muted); }
.breadcrumb { margin-bottom: 14px; color: var(--blue); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; }

.product-layout { align-items: start; }
.gallery-main { aspect-ratio: 1 / 1; overflow: hidden; background: var(--blue-soft); }
.gallery-main img { width: 100%; height: 100%; object-fit: cover; }
.gallery-thumbs { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-top: 12px; }
.gallery-thumb { aspect-ratio: 1 / 1; padding: 0; overflow: hidden; border: 1px solid transparent; background: var(--blue-soft); }
.gallery-thumb.active, .gallery-thumb:hover { border-color: var(--blue); }
.gallery-thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-info h1 { margin-bottom: 12px; font-size: clamp(34px, 4vw, 52px); }
.rating { margin-bottom: 22px; color: var(--gold); letter-spacing: .1em; }
.product-price { margin: 0 0 26px; color: var(--blue); font-size: 24px; font-weight: bold; }
.option-label { margin-bottom: 9px; font-size: 12px; font-weight: bold; letter-spacing: .1em; text-transform: uppercase; }
.sku-options { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 26px; }
.sku-btn { min-width: 72px; padding: 11px 15px; color: var(--ink); background: #fff; border: 1px solid var(--line); }
.sku-btn.active, .sku-btn:hover { color: var(--blue); border-color: var(--blue); }
.product-bullets { margin: 0 0 28px; padding-left: 19px; color: #4b5563; }
.product-bullets li { margin-bottom: 8px; }
.ingredient-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 28px; }
.ingredient { padding: 7px 11px; color: var(--blue); background: var(--blue-soft); font-size: 12px; }
.detail-images { max-width: 900px; margin: 0 auto; }
.detail-images img { width: 100%; height: auto; margin-bottom: 14px; }
.usage { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.usage-step { padding: 22px; border-left: 2px solid var(--gold); background: #fff; }
.usage-step strong { display: block; margin-bottom: 5px; color: var(--blue); }
.recommendation { max-width: 560px; margin: 0 auto; }

.about-copy p, .contact-copy p { color: var(--muted); }
.story-list { margin: 28px 0 0; padding: 0; list-style: none; }
.story-list li { margin-bottom: 17px; padding-left: 26px; position: relative; }
.story-list li::before { content: ''; position: absolute; top: 10px; left: 0; width: 9px; height: 9px; background: var(--gold); border-radius: 50%; }
.contact-grid { align-items: start; }
.contact-cards { display: grid; gap: 15px; margin-top: 28px; }
.contact-card { padding: 20px; border: 1px solid var(--line); }
.contact-card strong { display: block; margin-bottom: 4px; color: var(--blue); }
.form { padding: 32px; background: var(--blue-soft); }
.field { margin-bottom: 18px; }
.field label { display: block; margin-bottom: 7px; font-size: 12px; font-weight: bold; letter-spacing: .08em; text-transform: uppercase; }
.field input, .field textarea { width: 100%; padding: 12px 13px; color: var(--ink); background: #fff; border: 1px solid #c9d7e1; border-radius: 0; outline: 0; }
.field input:focus, .field textarea:focus { border-color: var(--blue); }
.field textarea { min-height: 140px; resize: vertical; }
.form-message { min-height: 24px; margin: 13px 0 0; color: var(--blue); font-size: 14px; }

@media (max-width: 800px) {
  .container { width: min(100% - 30px, 600px); }
  .header-inner { min-height: 66px; }
  .main-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--line); }
  .main-nav.open { display: block; }
  .main-nav ul { display: block; padding: 8px 15px 15px; }
  .main-nav a { padding: 13px 0; border: 0; }
  .nav-toggle { display: block; }
  .hero { min-height: 600px; background-position: 65% center; }
  .hero-overlay { background: linear-gradient(90deg, rgba(255,255,255,.96) 0%, rgba(255,255,255,.78) 75%, rgba(255,255,255,.2) 100%); }
  .hero-copy { max-width: 470px; }
  .feature-grid, .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .trust { border-right: 0; }
  .about-split, .contact-grid, .product-layout { grid-template-columns: 1fr; gap: 38px; }
  .product-info { order: -1; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .announce { font-size: 10px; }
  .section { padding: 62px 0; }
  .hero { min-height: 560px; }
  h1 { font-size: 43px; }
  .feature-grid, .products-grid, .trust-grid, .usage { grid-template-columns: 1fr; }
  .feature { padding: 22px 18px; }
  .trust { padding: 10px 0; }
  .product-card-body { padding: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .form { padding: 22px; }
}