:root {
  --ink: #171717;
  --paper: #f7f5f0;
  --muted: #e7e4dc;
  --navy: #16324f;
  --line: rgba(23, 23, 23, 0.2);
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 15px; line-height: 1.55; }
a { color: inherit; text-underline-offset: 0.18em; }
button { font: inherit; }
.container { width: min(100% - 3rem, 1280px); margin: 0 auto; }
h1, p { margin-top: 0; }
.eyebrow { margin: 0 0 0.5rem; font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(22, 50, 79, 0.6); }
.skip-link { position: fixed; z-index: 30; top: 0.75rem; left: 0.75rem; padding: 0.5rem 0.75rem; color: var(--paper); background: var(--ink); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

/* Header */
.site-header { position: sticky; z-index: 5; top: 0; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--paper) 94%, transparent); backdrop-filter: blur(10px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 4.25rem; }
.brand { font-size: 0.8rem; font-weight: 800; letter-spacing: 0.06em; text-decoration: none; color: var(--navy); }
.header-icons { display: flex; align-items: center; gap: 1.1rem; }
.icon-btn { position: relative; display: inline-flex; align-items: center; justify-content: center; border: 0; padding: 0; background: none; color: var(--navy); cursor: pointer; text-decoration: none; }
.cart-count { position: absolute; top: -0.5rem; right: -0.6rem; min-width: 1.05rem; height: 1.05rem; padding: 0 0.25rem; display: flex; align-items: center; justify-content: center; border-radius: 999px; background: var(--navy); color: var(--paper); font-size: 0.6rem; font-weight: 700; }

/* Breadcrumb */
.breadcrumb { display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 1.5rem 0 0; font-size: 0.75rem; letter-spacing: 0.03em; text-transform: uppercase; color: rgba(22, 50, 79, 0.55); }
.breadcrumb a { text-decoration: none; }
.breadcrumb a:hover, .breadcrumb a:focus-visible { text-decoration: underline; }
.breadcrumb [aria-current="page"] { color: var(--navy); }

/* Product main */
.product-main { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(2rem, 5vw, 4rem); padding: 1.5rem 0 clamp(3rem, 6vw, 5rem); align-items: start; }
.product-image { position: relative; aspect-ratio: 4 / 4.6; overflow: hidden; background: linear-gradient(160deg, #e3e6e8, #aeb6bb); }
.product-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.product-title { margin: 0 0 0.5rem; color: var(--navy); font-family: var(--display); font-weight: 400; font-size: clamp(1.9rem, 3vw, 2.6rem); letter-spacing: -0.01em; }
.product-price { margin: 0 0 1.25rem; font-size: 1.05rem; color: var(--navy); }
.product-desc { max-width: 26rem; margin: 0 0 1.75rem; color: rgba(22, 50, 79, 0.75); font-size: 0.9rem; line-height: 1.6; }

.product-color-label { margin: 0 0 0.7rem; font-size: 0.8rem; color: var(--navy); }
.product-color-label span { font-weight: 600; }
.color-swatches { display: flex; gap: 0.6rem; margin-bottom: 1.5rem; }
.swatch { width: 1.6rem; height: 1.6rem; border-radius: 50%; border: 2px solid transparent; padding: 2px; background-clip: content-box; cursor: pointer; }
.swatch--blue { background-color: #3f6a86; }
.swatch--sand { background-color: #cbb99e; }
.swatch--black { background-color: #1c1c1c; }
.swatch.is-active { border-color: var(--navy); }

.product-edition { margin: 0 0 1.5rem; font-size: 0.8rem; color: rgba(22, 50, 79, 0.6); }

.product-actions { display: flex; gap: 0.75rem; margin-bottom: 2rem; }
.btn-add-cart { flex: 1; border: 0; padding: 0.9rem 1.5rem; color: var(--paper); background: var(--navy); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer; }
.btn-add-cart:hover, .btn-add-cart:focus-visible { background: var(--ink); }
.btn-wishlist { flex-shrink: 0; width: 3rem; display: flex; align-items: center; justify-content: center; border: 1px solid var(--line); background: none; color: var(--navy); cursor: pointer; }

.product-accordion { border-top: 1px solid var(--line); }
.product-accordion details { border-bottom: 1px solid var(--line); }
.product-accordion summary { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--navy); cursor: pointer; list-style: none; }
.product-accordion summary::-webkit-details-marker { display: none; }
.product-accordion details[open] summary .acc-icon { transform: rotate(45deg); }
.acc-icon { display: inline-block; transition: transform 150ms ease; }
.acc-body { padding: 0 0 1.25rem; max-width: 28rem; font-size: 0.85rem; line-height: 1.6; color: rgba(22, 50, 79, 0.75); }
.acc-body a { color: var(--navy); }

/* Recently viewed */
.recently-viewed { padding-bottom: clamp(3rem, 6vw, 5rem); }
.rv-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.25rem; padding-top: 1.5rem; border-top: 1px solid var(--line); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--navy); }
.rv-nav { display: flex; gap: 0.6rem; }
.rv-nav button { border: 1px solid var(--line); width: 1.9rem; height: 1.9rem; background: none; color: var(--navy); cursor: pointer; }
.rv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.rv-item { position: relative; display: block; aspect-ratio: 1; overflow: hidden; background: linear-gradient(160deg, #ece7de, #cdbfae); }
.rv-item img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.rv-hover { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%) scale(0.85); display: flex; align-items: center; justify-content: center; width: 3.5rem; height: 3.5rem; border-radius: 50%; background: rgba(247, 245, 240, 0.92); color: var(--navy); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; opacity: 0; transition: opacity 150ms ease, transform 150ms ease; }
.rv-item:hover .rv-hover, .rv-item:focus-visible .rv-hover { opacity: 1; transform: translate(-50%, -50%) scale(1); }

/* Search overlay */
.search-overlay { position: fixed; inset: 0; z-index: 40; display: flex; align-items: flex-start; justify-content: center; padding: clamp(3rem, 10vh, 8rem) 1.5rem; background: rgba(23, 23, 23, 0.35); }
.search-overlay[hidden] { display: none; }
.search-overlay-inner { position: relative; width: min(100%, 34rem); padding: clamp(2rem, 5vw, 3rem); background: var(--paper); box-shadow: 0 30px 70px rgba(0, 0, 0, 0.25); }
.search-overlay-inner h2 { margin: 0 0 1.5rem; color: var(--navy); font-family: var(--display); font-weight: 400; font-size: clamp(2rem, 4vw, 2.6rem); }
.search-overlay-inner input { width: 100%; border: 0; border-bottom: 1px solid rgba(22, 50, 79, 0.35); padding: 0.5rem 0; background: transparent; font-size: 1rem; color: var(--navy); }
.search-overlay-inner input:focus { outline: none; border-color: var(--navy); }
.search-close { position: absolute; top: clamp(1.25rem, 3vw, 2rem); right: clamp(1.25rem, 3vw, 2rem); border: 0; background: none; color: var(--navy); font-size: 1.4rem; line-height: 1; cursor: pointer; }
.search-links { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-top: 2rem; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; }
.search-links a { text-decoration: none; color: var(--navy); }
.search-links a:hover, .search-links a:focus-visible { text-decoration: underline; }

/* Cart drawer */
.cart-drawer { position: fixed; inset: 0; z-index: 40; }
.cart-drawer-backdrop { position: absolute; inset: 0; background: rgba(23, 23, 23, 0.35); }
.cart-drawer-panel { position: absolute; top: 0; right: 0; bottom: 0; width: min(100%, 24rem); display: flex; flex-direction: column; background: var(--paper); box-shadow: -20px 0 50px rgba(0, 0, 0, 0.2); }
.cart-drawer-header { display: flex; align-items: center; justify-content: space-between; padding: 1.5rem; border-bottom: 1px solid var(--line); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--navy); }
.cart-drawer-header button { border: 0; background: none; color: var(--navy); font-size: 1.3rem; line-height: 1; cursor: pointer; }
.cart-items { flex: 1; overflow-y: auto; padding: 0.5rem 1.5rem; }
.cart-item { display: grid; grid-template-columns: 3.5rem 1fr auto; gap: 0.85rem; align-items: center; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.cart-item img { width: 3.5rem; height: 3.5rem; object-fit: cover; background: var(--muted); }
.cart-item-name { margin: 0; font-size: 0.85rem; font-weight: 600; color: var(--navy); }
.cart-item-variant { margin: 0.15rem 0; font-size: 0.75rem; color: rgba(22, 50, 79, 0.55); }
.cart-item-price { margin: 0; font-size: 0.8rem; color: var(--navy); }
.qty-stepper { display: flex; align-items: center; gap: 0.5rem; border: 1px solid var(--line); padding: 0.25rem 0.5rem; }
.qty-stepper button { border: 0; background: none; color: var(--navy); cursor: pointer; font-size: 0.85rem; }
.qty-value { min-width: 1rem; text-align: center; font-size: 0.8rem; }
.cart-subtotal { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1.5rem; border-top: 1px solid var(--line); font-size: 0.85rem; font-weight: 600; color: var(--navy); }
.cart-checkout { display: block; margin: 0 1.5rem 1.5rem; padding: 0.9rem; text-align: center; color: var(--paper); background: var(--navy); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; text-decoration: none; }
.cart-checkout:hover, .cart-checkout:focus-visible { background: var(--ink); }

/* Lab Assistant */
.lab-assistant { position: fixed; z-index: 20; right: clamp(1rem, 4vw, 2rem); bottom: clamp(1rem, 4vw, 2rem); display: flex; flex-direction: column; align-items: flex-end; gap: 0.85rem; }
.lab-assistant-launcher { display: flex; align-items: center; gap: 0.75rem; }
.lab-assistant-hint { margin: 0; max-width: 12rem; padding: 0.65rem 1rem; color: var(--ink); background: var(--paper); border-radius: 999px; font-size: 0.8rem; line-height: 1.3; box-shadow: 0 6px 20px rgba(0, 0, 0, 0.14); }
.lab-assistant-trigger { flex-shrink: 0; display: flex; align-items: center; justify-content: center; width: 4.25rem; height: 4.25rem; border-radius: 50%; border: 0; padding: 0; color: var(--paper); background: var(--ink); text-align: center; font-size: 0.62rem; font-weight: 700; letter-spacing: 0.04em; line-height: 1.25; cursor: pointer; box-shadow: 0 8px 26px rgba(0, 0, 0, 0.22); }
.lab-assistant-trigger:hover, .lab-assistant-trigger:focus-visible { background: var(--navy); }
.lab-assistant-panel { width: min(20rem, calc(100vw - 2rem)); background: var(--paper); border: 1px solid var(--line); box-shadow: 0 20px 48px rgba(0, 0, 0, 0.16); }
.lab-assistant-header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.1rem; border-bottom: 1px solid var(--line); }
.lab-assistant-header p { margin: 0; font-size: 0.75rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.lab-assistant-controls { display: flex; gap: 0.5rem; }
.lab-assistant-controls button { width: 1.6rem; height: 1.6rem; border: 1px solid var(--line); background: none; color: var(--ink); cursor: pointer; line-height: 1; }
.lab-assistant-body { padding: 1.1rem; }
.lab-assistant-greeting { margin: 0 0 1rem; font-size: 0.9rem; }
.lab-assistant-menu { display: flex; flex-direction: column; }
.lab-assistant-menu a { display: flex; align-items: center; justify-content: space-between; padding: 0.75rem 0; border-top: 1px solid var(--line); color: var(--ink); font-size: 0.9rem; font-weight: 600; text-decoration: none; }
.lab-assistant-menu a:hover, .lab-assistant-menu a:focus-visible { text-decoration: underline; }
.lab-assistant-form { display: flex; align-items: center; gap: 0.5rem; padding: 0.85rem 1.1rem; border-top: 1px solid var(--line); }
.lab-assistant-form input { flex: 1; border: 0; padding: 0; background: transparent; font: inherit; font-size: 0.85rem; color: var(--ink); }
.lab-assistant-form input::placeholder { color: rgba(23, 23, 23, 0.45); }
.lab-assistant-form button { flex-shrink: 0; border: 0; padding: 0; background: none; color: var(--ink); font-size: 1.1rem; cursor: pointer; }

@media (max-width: 900px) {
  .product-main { grid-template-columns: 1fr; }
  .rv-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
}

@media (max-width: 720px) {
  .header-icons { gap: 0.85rem; }
  .cart-drawer-panel { width: 100%; }
  .lab-assistant { right: 1rem; bottom: 1rem; }
  .lab-assistant-hint { display: none; }
  .lab-assistant-trigger { width: 3.5rem; height: 3.5rem; font-size: 0.55rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }