/* ==========================================================================
   SUPPLEMENTGO // BRUTALIST RESEARCH CHEMICAL PLATFORM
   Design System: Simple, High-Contrast Brutalist Aesthetic
   Colors: Electric Blue (#0289d3), Bio-Green (#63b11c), Dark Carbon (#0c1c2e)
   ========================================================================== */

:root {
  /* Logo Color Palette */
  --color-blue: #0289d3;
  --color-blue-dark: #006eb0;
  --color-blue-subtle: #e6f3fa;
  
  --color-green: #63b11c;
  --color-green-dark: #4b8b12;
  --color-green-subtle: #f0f8e9;
  
  --color-dark: #0c1c2e;
  --color-dark-muted: #1e334a;
  --color-slate: #54667a;
  --color-slate-light: #94a3b8;
  
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-surface-dim: #edf1f5;
  --color-surface-hover: #f1f5f9;
  
  --color-amber: #d97706;
  --color-amber-bg: #fffbeb;
  
  /* Brutalist Metrics */
  --border-width: 2px;
  --border-main: 2px solid var(--color-dark);
  --border-subtle: 1px solid #cbd5e1;
  
  --shadow-brutal: 4px 4px 0px var(--color-dark);
  --shadow-brutal-sm: 2px 2px 0px var(--color-dark);
  --shadow-brutal-lg: 6px 6px 0px var(--color-dark);
  
  /* Fonts */
  --font-display: "Syne", sans-serif;
  --font-ui: "Space Grotesk", sans-serif;
  --font-body: "Plus Jakarta Sans", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
}

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

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

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-dark);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-image: 
    linear-gradient(to right, rgba(12, 28, 46, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(12, 28, 46, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Utilities */
.text-green { color: var(--color-green) !important; }
.text-blue { color: var(--color-blue) !important; }
.highlight-blue { color: var(--color-blue); }
.highlight-green { color: var(--color-green); }

/* Top Regulatory Strip */
.regulatory-strip {
  background-color: var(--color-dark);
  color: #ffffff;
  padding: 8px 24px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--color-blue);
  flex-wrap: wrap;
  gap: 8px;
}

.regulatory-content {
  display: flex;
  align-items: center;
  gap: 8px;
}

.warning-icon {
  color: #fbbf24;
  font-size: 0.9rem;
}

.regulatory-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-green);
  font-weight: 700;
}

.pulse-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-green);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--color-green);
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.8; }
}

/* Header & Navbar */
.site-header {
  background-color: var(--color-surface);
  border-bottom: var(--border-main);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Logo Top Left */
.navbar-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-image {
  height: 44px;
  width: auto;
  display: block;
  object-fit: contain;
}

/* Navigation Links */
.main-nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-dark);
  text-decoration: none;
  padding: 6px 14px;
  border: 1px solid transparent;
  transition: all 0.15s ease;
  letter-spacing: 0.05em;
}

.nav-link:hover {
  background-color: var(--color-blue-subtle);
  border-color: var(--color-blue);
  color: var(--color-blue-dark);
}

.nav-link.active {
  background-color: var(--color-dark);
  color: #ffffff;
  border-color: var(--color-dark);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 12px;
  color: var(--color-slate);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-wrapper input {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 8px 12px 8px 36px;
  width: 220px;
  background-color: var(--color-surface-dim);
  border: var(--border-main);
  border-radius: 0;
  color: var(--color-dark);
  outline: none;
  transition: all 0.2s;
}

.search-wrapper input:focus {
  background-color: #ffffff;
  border-color: var(--color-blue);
  box-shadow: 2px 2px 0px var(--color-blue);
  width: 260px;
}

/* Cart Trigger Button */
.cart-trigger-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  background-color: var(--color-surface);
  color: var(--color-dark);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal-sm);
  padding: 8px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border-radius: 0;
  transition: all 0.1s ease;
}

.cart-trigger-btn:hover {
  background-color: var(--color-green-subtle);
  border-color: var(--color-green-dark);
  color: var(--color-green-dark);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--color-dark);
}

.cart-trigger-btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px var(--color-dark);
}

.cart-badge {
  background-color: var(--color-green);
  color: #ffffff;
  padding: 2px 7px;
  font-size: 0.75rem;
  font-weight: 700;
}

/* Main App Views */
#app-root {
  flex: 1;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
}

.view-section {
  display: none;
}

.view-section.active {
  display: block;
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   CATALOG VIEW
   ========================================================================== */
.catalog-hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
  background-color: var(--color-surface);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal);
  padding: 36px 40px;
  margin-bottom: 32px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-blue-subtle);
  border: 1px solid var(--color-blue);
  color: var(--color-blue-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 10px;
  margin-bottom: 16px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 3.8vw, 3.4rem);
  line-height: 1.05;
  font-weight: 800;
  color: var(--color-dark);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.hero-subtext {
  font-size: 1.05rem;
  color: var(--color-slate);
  max-width: 600px;
  line-height: 1.6;
  margin-bottom: 28px;
}

.hero-specs-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  border-top: var(--border-main);
  padding-top: 20px;
}

.spec-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.spec-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--color-slate);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.spec-val {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-dark);
}

/* Terminal Box */
.terminal-box {
  background-color: var(--color-dark);
  color: #e2e8f0;
  border: var(--border-main);
  height: 100%;
  display: flex;
  flex-direction: column;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.terminal-bar {
  background-color: var(--color-dark-muted);
  border-bottom: 1px solid #334155;
  padding: 8px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.terminal-dot.red { background-color: #ef4444; }
.terminal-dot.yellow { background-color: #f59e0b; }
.terminal-dot.green { background-color: #10b981; }

.terminal-title {
  margin-left: 6px;
  font-size: 0.72rem;
  color: #94a3b8;
  letter-spacing: 0.05em;
}

.terminal-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.term-dim {
  color: #64748b;
}

.term-code-block {
  margin-top: auto;
  background-color: #050b14;
  border-left: 3px solid var(--color-green);
  padding: 10px 12px;
  color: var(--color-green);
  font-weight: 700;
}

/* Catalog Toolbar */
.catalog-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  background-color: var(--color-surface);
  border: var(--border-main);
  padding: 12px 20px;
  flex-wrap: wrap;
  gap: 16px;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-slate);
  margin-right: 4px;
}

.filter-btn {
  background-color: var(--color-surface-dim);
  border: 1px solid var(--color-dark);
  color: var(--color-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 12px;
  cursor: pointer;
  border-radius: 0;
  transition: all 0.15s;
}

.filter-btn:hover {
  background-color: var(--color-blue-subtle);
  border-color: var(--color-blue);
  color: var(--color-blue-dark);
}

.filter-btn.active {
  background-color: var(--color-dark);
  color: #ffffff;
  border-color: var(--color-dark);
}

.view-indicator {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-slate);
  display: flex;
  align-items: center;
  gap: 8px;
}

.indicator-led {
  width: 8px;
  height: 8px;
  background-color: var(--color-green);
  border-radius: 50%;
}

/* ==========================================================================
   4-WIDE PRODUCT GRID
   ========================================================================== */
.product-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.product-card {
  background-color: var(--color-surface);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal);
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  position: relative;
}

.product-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-brutal-lg);
  border-color: var(--color-blue);
}

.card-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background-color: var(--color-surface-dim);
  border-bottom: var(--border-main);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.card-batch-code {
  color: var(--color-slate);
  font-weight: 700;
}

.card-purity-tag {
  background-color: var(--color-green);
  color: #ffffff;
  padding: 2px 6px;
  font-weight: 700;
}

/* Card Image */
.card-image-box {
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: #f8fafc;
  border-bottom: var(--border-main);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-img {
  width: 90%;
  height: 90%;
  object-fit: contain;
  transition: transform 0.3s ease;
}

.product-card:hover .card-img {
  transform: scale(1.05);
}

.card-body {
  padding: 16px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-cas-line {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-blue);
  font-weight: 700;
  margin-bottom: 4px;
}

.card-product-name {
  font-family: var(--font-ui);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-dark);
  line-height: 1.25;
  margin-bottom: 6px;
}

.card-product-sub {
  font-size: 0.8rem;
  color: var(--color-slate);
  line-height: 1.4;
  margin-bottom: 16px;
  flex: 1;
}

.card-footer {
  border-top: 1px solid #e2e8f0;
  padding-top: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-price-block {
  display: flex;
  flex-direction: column;
}

.card-price-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-slate);
}

.card-price {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-dark);
}

.card-action-btn {
  background-color: var(--color-dark);
  color: #ffffff;
  border: 1px solid var(--color-dark);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 8px 12px;
  cursor: pointer;
  border-radius: 0;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s;
}

.product-card:hover .card-action-btn {
  background-color: var(--color-blue);
  border-color: var(--color-blue);
}

/* Analytical Banner Section */
.analytical-banner {
  background-color: var(--color-surface);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 48px;
}

.banner-col {
  padding: 32px 24px;
  border-right: var(--border-main);
  display: flex;
  flex-direction: column;
}

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

.col-num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-blue);
  margin-bottom: 12px;
}

.banner-col h3 {
  font-family: var(--font-ui);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-dark);
}

.banner-col p {
  font-size: 0.85rem;
  color: var(--color-slate);
  line-height: 1.6;
}

/* ==========================================================================
   PRODUCT PAGE VIEW (1/3 LEFT + 2/3 RIGHT)
   ========================================================================== */
.product-page-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.back-to-catalog-btn {
  background-color: var(--color-surface);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal-sm);
  color: var(--color-dark);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 8px 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  border-radius: 0;
  transition: all 0.15s;
}

.back-to-catalog-btn:hover {
  background-color: var(--color-dark);
  color: #ffffff;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--color-blue);
}

.product-breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-slate);
  display: flex;
  align-items: center;
  gap: 8px;
}

.product-breadcrumbs .sep {
  color: var(--color-slate-light);
}

.product-breadcrumbs .active-crumb {
  color: var(--color-dark);
  font-weight: 700;
}

/* 1/3 (LEFT) + 2/3 (RIGHT) CONTAINER */
.product-layout-container {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 32px;
  align-items: start;
}

/* --------------------------------------------------------------------------
   LEFT 1/3: IMAGE VIEWER & SPECIMEN GALLERY
   -------------------------------------------------------------------------- */
.product-col-left {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.image-viewer-card {
  background-color: var(--color-surface);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal);
  display: flex;
  flex-direction: column;
}

.viewer-header {
  padding: 10px 16px;
  background-color: var(--color-surface-dim);
  border-bottom: var(--border-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
}

.viewer-tag {
  color: var(--color-dark);
}

.viewer-zoom-tip {
  color: var(--color-blue);
}

/* Large Main Image Viewer */
.main-image-viewer {
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: #ffffff;
  border-bottom: var(--border-main);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: crosshair;
}

.active-view-img {
  width: 95%;
  height: 95%;
  object-fit: contain;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.main-image-viewer:hover .active-view-img {
  transform: scale(1.15);
}

/* Reticle Crosshairs */
.reticle-overlay {
  position: absolute;
  inset: 12px;
  pointer-events: none;
}

.reticle-corner {
  position: absolute;
  width: 12px;
  height: 12px;
  border-color: rgba(12, 28, 46, 0.3);
}

.reticle-corner.top-left { top: 0; left: 0; border-top: 2px solid; border-left: 2px solid; }
.reticle-corner.top-right { top: 0; right: 0; border-top: 2px solid; border-right: 2px solid; }
.reticle-corner.bottom-left { bottom: 0; left: 0; border-bottom: 2px solid; border-left: 2px solid; }
.reticle-corner.bottom-right { bottom: 0; right: 0; border-bottom: 2px solid; border-right: 2px solid; }

.reticle-cross {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  opacity: 0.15;
}

.reticle-cross::before, .reticle-cross::after {
  content: "";
  position: absolute;
  background-color: var(--color-dark);
}
.reticle-cross::before { top: 0; bottom: 0; left: 7px; width: 2px; }
.reticle-cross::after { left: 0; right: 0; top: 7px; height: 2px; }

/* Thumbnails Strip */
.gallery-thumbnails-wrapper {
  padding: 16px;
  border-bottom: var(--border-main);
}

.gallery-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--color-slate);
  margin-bottom: 10px;
}

.gallery-thumbnails {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.thumb-item {
  aspect-ratio: 1 / 1;
  background-color: var(--color-surface-dim);
  border: 1px solid var(--color-dark);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  position: relative;
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.thumb-item:hover {
  border-color: var(--color-blue);
  transform: translateY(-2px);
}

.thumb-item.active {
  border: 2px solid var(--color-blue);
  box-shadow: 2px 2px 0px var(--color-blue);
  background-color: #ffffff;
}

.thumb-label {
  position: absolute;
  bottom: 2px;
  right: 2px;
  background-color: rgba(12, 28, 46, 0.85);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  padding: 1px 4px;
}

/* Specimen Meta Box */
.specimen-meta-box {
  padding: 14px 16px;
  background-color: var(--color-surface-dim);
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.meta-row {
  display: flex;
  justify-content: space-between;
}

.meta-k {
  color: var(--color-slate);
}

.meta-v {
  font-weight: 700;
  color: var(--color-dark);
}

/* --------------------------------------------------------------------------
   RIGHT 2/3: ORDER CARD & DESCRIPTION
   -------------------------------------------------------------------------- */
.product-col-right {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* Top Portion: Order Card */
.product-order-card {
  background-color: var(--color-surface);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal);
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.order-header-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.cas-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background-color: var(--color-blue-subtle);
  color: var(--color-blue-dark);
  border: 1px solid var(--color-blue);
  padding: 4px 10px;
}

.purity-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background-color: var(--color-green-subtle);
  color: var(--color-green-dark);
  border: 1px solid var(--color-green);
  padding: 4px 10px;
}

.in-stock-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-green-dark);
  margin-left: auto;
}

.product-headline {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 2.8vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-dark);
  letter-spacing: -0.01em;
  margin-bottom: 8px;
}

.product-subhead {
  font-size: 1.05rem;
  color: var(--color-slate);
  margin-bottom: 24px;
}

/* Price Box */
.product-price-section {
  display: flex;
  align-items: baseline;
  gap: 16px;
  border-top: var(--border-main);
  border-bottom: var(--border-main);
  padding: 18px 0;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.price-box .currency {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-dark);
}

.price-box .price-value {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-dark);
  line-height: 1;
}

.price-box .currency-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-slate);
  margin-left: 6px;
  font-weight: 700;
}

.tax-shipping-note {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-slate);
  max-width: 320px;
}

/* Tier & Quantity Grid */
.selection-grid {
  display: grid;
  grid-template-columns: 2.2fr 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.section-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-slate);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.tier-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.tier-btn {
  background-color: var(--color-surface);
  border: var(--border-main);
  padding: 10px 8px;
  cursor: pointer;
  border-radius: 0;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: all 0.15s;
}

.tier-btn strong {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--color-dark);
}

.tier-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 700;
  background-color: var(--color-green);
  color: #ffffff;
  padding: 1px 4px;
  align-self: flex-start;
}

.tier-price {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-blue);
  margin-top: auto;
}

.tier-btn:hover {
  background-color: var(--color-surface-dim);
  border-color: var(--color-blue);
}

.tier-btn.active {
  border: 2px solid var(--color-blue);
  background-color: var(--color-blue-subtle);
  box-shadow: 2px 2px 0px var(--color-blue);
}

/* Quantity Counter */
.qty-counter {
  display: flex;
  height: 48px;
  border: var(--border-main);
  background-color: var(--color-surface);
}

.qty-btn {
  width: 44px;
  background-color: var(--color-surface-dim);
  border: none;
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-dark);
  transition: background 0.1s;
}

.qty-btn:hover {
  background-color: #e2e8f0;
}

.qty-counter input {
  flex: 1;
  border: none;
  border-left: 1px solid var(--color-dark);
  border-right: 1px solid var(--color-dark);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  outline: none;
  width: 50px;
}

/* BUY ACTIONS */
.buy-action-area {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

.brutalist-buy-btn {
  background-color: var(--color-blue);
  color: #ffffff;
  border: var(--border-main);
  box-shadow: var(--shadow-brutal);
  padding: 16px 24px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  letter-spacing: 0.04em;
  transition: all 0.15s ease;
}

.brutalist-buy-btn:hover {
  background-color: var(--color-dark);
  color: #ffffff;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-brutal-lg);
}

.brutalist-buy-btn:active {
  transform: translate(2px, 2px);
  box-shadow: var(--shadow-brutal-sm);
}

.express-checkout-btn {
  background-color: var(--color-surface);
  color: var(--color-dark);
  border: var(--border-main);
  box-shadow: var(--shadow-brutal-sm);
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.15s;
}

.express-checkout-btn:hover {
  background-color: var(--color-green-subtle);
  border-color: var(--color-green);
  color: var(--color-green-dark);
}

/* Reassurance Strip */
.order-reassurance-strip {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid #e2e8f0;
  padding-top: 16px;
}

.reassurance-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-slate);
}

.check-icon {
  color: var(--color-green);
  font-weight: 800;
}

/* --------------------------------------------------------------------------
   BELOW THE RIGHT TWO THIRDS: PRODUCT DESCRIPTION & TABS
   -------------------------------------------------------------------------- */
.product-description-section {
  display: flex;
  flex-direction: column;
}

.desc-tabs-header {
  display: flex;
  gap: 4px;
  border-bottom: var(--border-main);
  overflow-x: auto;
}

.desc-tab-btn {
  background-color: var(--color-surface-dim);
  border: var(--border-main);
  border-bottom: none;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-dark);
  cursor: pointer;
  border-radius: 0;
  white-space: nowrap;
  transition: all 0.1s;
}

.desc-tab-btn:hover {
  background-color: #ffffff;
}

.desc-tab-btn.active {
  background-color: var(--color-dark);
  color: #ffffff;
}

.desc-tab-content {
  display: none;
}

.desc-tab-content.active {
  display: block;
}

.desc-card {
  background-color: var(--color-surface);
  border: var(--border-main);
  border-top: none;
  box-shadow: var(--shadow-brutal);
  padding: 28px;
}

.desc-heading {
  font-family: var(--font-ui);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.desc-heading::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 18px;
  background-color: var(--color-blue);
}

.desc-prose {
  font-size: 0.95rem;
  color: var(--color-slate);
  line-height: 1.7;
  margin-bottom: 24px;
}

.mechanism-box {
  background-color: var(--color-surface-dim);
  border: 1px solid #cbd5e1;
  border-left: 4px solid var(--color-green);
  padding: 18px 20px;
}

.mechanism-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
  letter-spacing: 0.04em;
}

.mechanism-list {
  list-style-type: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mechanism-list li {
  font-size: 0.85rem;
  color: var(--color-slate);
  position: relative;
  padding-left: 20px;
  line-height: 1.5;
}

.mechanism-list li::before {
  content: "»";
  position: absolute;
  left: 0;
  color: var(--color-green);
  font-weight: 800;
}

/* Analytical Specs Table */
.specs-table-wrapper {
  overflow-x: auto;
}

.brutalist-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.brutalist-table th {
  background-color: var(--color-dark);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--color-dark);
  letter-spacing: 0.05em;
}

.brutalist-table td {
  padding: 10px 14px;
  border: 1px solid #e2e8f0;
  color: var(--color-dark);
}

.brutalist-table tr:nth-child(even) {
  background-color: var(--color-surface-dim);
}

.brutalist-table td:first-child {
  font-weight: 700;
  color: var(--color-dark);
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.brutalist-table td:last-child {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-slate);
}

/* Protocol Grid */
.protocol-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.protocol-step {
  background-color: var(--color-surface-dim);
  border: 1px solid #cbd5e1;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  background-color: var(--color-dark);
  color: #ffffff;
  padding: 2px 6px;
  align-self: flex-start;
}

.protocol-step h4 {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-dark);
}

.protocol-step p {
  font-size: 0.82rem;
  color: var(--color-slate);
  line-height: 1.5;
}

/* Warning Card */
.warning-card {
  background-color: var(--color-amber-bg);
  border-color: var(--color-amber);
}

.warning-title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--color-amber);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.warn-symbol {
  font-size: 1.2rem;
}

.warning-text {
  font-size: 0.9rem;
  color: #78350f;
  margin-bottom: 16px;
  line-height: 1.6;
}

.warning-bullet-points {
  list-style-type: square;
  padding-left: 20px;
  color: #78350f;
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 8px;
  line-height: 1.5;
}

/* ==========================================================================
   CART DRAWER & BACKDROP
   ========================================================================== */
.cart-drawer-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(12, 28, 46, 0.6);
  backdrop-filter: blur(2px);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.cart-drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.cart-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 440px;
  background-color: var(--color-surface);
  border-left: var(--border-main);
  z-index: 210;
  transform: translateX(100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.cart-drawer.active {
  transform: translateX(0);
}

.cart-drawer-header {
  padding: 16px 20px;
  background-color: var(--color-dark);
  color: #ffffff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 2px solid var(--color-blue);
}

.drawer-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.drawer-icon {
  color: var(--color-green);
}

.drawer-close-btn {
  background: none;
  border: none;
  color: #ffffff;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.cart-items-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cart-item {
  border: 1px solid var(--color-dark);
  background-color: var(--color-surface-dim);
  padding: 12px;
  display: flex;
  gap: 12px;
  position: relative;
}

.cart-item-img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  background-color: #ffffff;
  border: 1px solid #cbd5e1;
  flex-shrink: 0;
}

.cart-item-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cart-item-name {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-dark);
}

.cart-item-tier {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-slate);
}

.cart-item-price-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 6px;
}

.cart-item-price {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-blue);
}

.cart-item-remove {
  background: none;
  border: none;
  color: #ef4444;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  cursor: pointer;
  text-decoration: underline;
}

.empty-cart-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--color-slate);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.cart-drawer-footer {
  padding: 20px;
  border-top: var(--border-main);
  background-color: var(--color-surface);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.manifest-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-slate);
}

.manifest-total-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid #e2e8f0;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-dark);
}

.manifest-total-val {
  font-size: 1.35rem;
  color: var(--color-blue);
}

.manifest-checkout-btn {
  background-color: var(--color-green);
  color: #ffffff;
  border: var(--border-main);
  box-shadow: var(--shadow-brutal-sm);
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 800;
  cursor: pointer;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.15s;
}

.manifest-checkout-btn:hover {
  background-color: var(--color-dark);
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--color-dark);
}

.cart-legal-notice {
  font-size: 0.7rem;
  color: var(--color-slate);
  text-align: center;
  line-height: 1.4;
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--color-dark);
  color: #ffffff;
  border: 2px solid var(--color-green);
  box-shadow: var(--shadow-brutal);
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 300;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: all 0.2s ease;
}

.toast-notification.active {
  opacity: 1;
  transform: translateY(0);
}

.toast-icon {
  color: var(--color-green);
  font-size: 1.1rem;
}

/* Footer */
.site-footer {
  background-color: var(--color-surface);
  border-top: var(--border-main);
  margin-top: auto;
}

.footer-top-grid {
  max-width: 1440px;
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 32px;
}

.footer-logo {
  height: 38px;
  width: auto;
  margin-bottom: 14px;
  display: block;
}

.footer-desc {
  font-size: 0.85rem;
  color: var(--color-slate);
  line-height: 1.6;
  margin-bottom: 16px;
}

.footer-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-dark);
  color: var(--color-green);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 10px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 0.82rem;
  color: var(--color-slate);
  text-decoration: none;
  transition: color 0.15s;
}

.footer-links a:hover {
  color: var(--color-blue);
  text-decoration: underline;
}

.dispatch-text {
  font-size: 0.82rem;
  color: var(--color-slate);
  margin-bottom: 12px;
  line-height: 1.5;
}

.batch-search-box {
  display: flex;
  border: var(--border-main);
}

.batch-search-box input {
  flex: 1;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border: none;
  outline: none;
  background-color: var(--color-surface-dim);
}

.batch-search-box button {
  background-color: var(--color-dark);
  color: #ffffff;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 8px 14px;
  cursor: pointer;
  transition: background 0.15s;
}

.batch-search-box button:hover {
  background-color: var(--color-blue);
}

.footer-bottom-bar {
  background-color: var(--color-dark);
  color: #94a3b8;
  padding: 24px;
  border-top: 1px solid #1e293b;
}

.bottom-disclaimer {
  max-width: 1440px;
  margin: 0 auto 12px auto;
  font-size: 0.72rem;
  line-height: 1.5;
}

.bottom-copyright {
  max-width: 1440px;
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  color: #64748b;
}

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */
@media (max-width: 1200px) {
  .product-grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
  .analytical-banner {
    grid-template-columns: repeat(2, 1fr);
  }
  .banner-col {
    border-bottom: var(--border-main);
  }
  .banner-col:nth-child(2) {
    border-right: none;
  }
  .footer-top-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .catalog-hero {
    grid-template-columns: 1fr;
  }
  .hero-specs-row {
    grid-template-columns: repeat(2, 1fr);
  }
  /* Collapse Product Page 1/3 and 2/3 on Tablet */
  .product-layout-container {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .selection-grid {
    grid-template-columns: 1fr;
  }
  .tier-options {
    grid-template-columns: 1fr;
  }
  .product-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .protocol-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-container {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .main-nav {
    overflow-x: auto;
    padding-bottom: 4px;
  }
  .header-actions {
    justify-content: space-between;
  }
  .search-wrapper input {
    width: 100%;
  }
  .search-wrapper input:focus {
    width: 100%;
  }
  .product-grid-4 {
    grid-template-columns: 1fr;
  }
  .buy-action-area {
    grid-template-columns: 1fr;
  }
  .analytical-banner {
    grid-template-columns: 1fr;
  }
  .banner-col {
    border-right: none;
  }
  .footer-top-grid {
    grid-template-columns: 1fr;
  }
}