/* ==========================================================================
   Axiom Tissue — Modern Clinical Biotech Design System
   (Alternate style — drop-in replacement for styles.css)
   ========================================================================== */

:root {
  /* Clinical, scientific palette */
  --color-cream: #ffffff;            /* primary background */
  --color-sand: #f1f5f9;             /* subtle surface */
  --color-peach: #ecfeff;             /* accent surface (cyan-tinted) */
  --color-terracotta: #0891b2;        /* primary accent: scientific teal */
  --color-terracotta-dark: #0e7490;   /* accent hover */
  --color-sage: #1e3a5f;              /* deep navy */
  --color-sage-dark: #0f172a;         /* deepest navy */
  --color-teal: #06b6d4;              /* bright cyan highlight */
  --color-warm-gold: #3b82f6;         /* crisp blue */
  --color-ink: #0f172a;               /* primary text/dark */
  --color-text: #334155;              /* body text */
  --color-muted: #64748b;             /* secondary text */
  --color-border: #e2e8f0;            /* hairline borders */
  --color-white: #ffffff;

  /* Typography — sans throughout */
  --font-serif: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Spacing */
  --max-width: 1240px;
  --section-padding: 112px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows — crisper */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04), 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 6px rgba(15, 23, 42, 0.05), 0 10px 15px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 15px rgba(15, 23, 42, 0.08), 0 20px 40px rgba(15, 23, 42, 0.12);
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-terracotta);
  text-decoration: none;
  transition: color 0.2s ease;
  font-weight: 500;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.4rem, 5.5vw, 4.2rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); letter-spacing: -0.025em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); letter-spacing: -0.015em; }
h4 { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em; }

p { margin-bottom: 1em; }

/* Chinese typography */
html[lang="zh"] body {
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}
html[lang="zh"] h1, html[lang="zh"] h2, html[lang="zh"] h3, html[lang="zh"] h4 {
  font-family: "Inter", "Noto Sans SC", "PingFang SC", sans-serif;
  letter-spacing: -0.01em;
  font-weight: 700;
}

/* ==========================================================================
   Layout Utilities
   ========================================================================== */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: var(--section-padding) 0;
}

.section-sm { padding: 72px 0; }

.section-cream { background: var(--color-white); }
.section-sand { background: var(--color-sand); }
.section-peach { background: var(--color-peach); }
.section-white { background: var(--color-white); }
.section-dark {
  background: var(--color-sage-dark);
  color: #cbd5e1;
  position: relative;
}
.section-dark h1, .section-dark h2, .section-dark h3 { color: var(--color-white); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-terracotta);
  font-weight: 700;
  margin-bottom: 20px;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 1.5px;
  background: var(--color-terracotta);
}

.lead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-muted);
  max-width: 720px;
}

.text-center { text-align: center; }
.text-center .eyebrow { justify-content: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Buttons — sharper, bolder */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  font-family: inherit;
}

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

.btn-primary:hover {
  background: var(--color-terracotta);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border: 1.5px solid var(--color-border);
}

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

/* ==========================================================================
   Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

.nav-brand:hover { color: var(--color-ink); }

.nav-brand-mark {
  width: 36px;
  height: 36px;
  background: var(--color-ink);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-teal);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 800;
  font-style: normal;
  position: relative;
}

.nav-brand-mark::after {
  content: "";
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 10px;
  height: 10px;
  background: var(--color-teal);
  border-radius: 2px;
  border: 2px solid var(--color-white);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-ink);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-terracotta);
  border-radius: 0;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--color-sand);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--color-border);
}

.lang-btn {
  border: none;
  background: transparent;
  padding: 5px 12px;
  border-radius: 3px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-muted);
  cursor: pointer;
  transition: all 0.15s ease;
  font-family: inherit;
}

.lang-btn.active {
  background: var(--color-ink);
  color: var(--color-white);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  margin: 5px 0;
  border-radius: 0;
  transition: all 0.3s ease;
}

/* ==========================================================================
   Hero — data-driven, scientific
   ========================================================================== */

.hero {
  position: relative;
  padding: 120px 0 140px;
  background:
    linear-gradient(180deg, var(--color-white) 0%, var(--color-sand) 100%);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  top: -200px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content h1 {
  margin-bottom: 28px;
}

.hero-content h1 em {
  color: var(--color-terracotta);
  font-style: normal;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-terracotta), var(--color-teal));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 40px;
  color: var(--color-muted);
  max-width: 560px;
}

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

.hero-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--color-sage-dark) 0%, var(--color-sage) 50%, var(--color-terracotta) 100%);
  border: 1px solid var(--color-border);
}

.hero-visual svg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ==========================================================================
   Page header
   ========================================================================== */

.page-header {
  padding: 96px 0 72px;
  background: var(--color-sand);
  text-align: center;
  position: relative;
  border-bottom: 1px solid var(--color-border);
}

.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15, 23, 42, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, 0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, black, transparent);
  -webkit-mask-image: linear-gradient(180deg, black, transparent);
  pointer-events: none;
}

.page-header > .container { position: relative; }

.page-header .eyebrow { margin-bottom: 16px; }

.page-header h1 {
  max-width: 880px;
  margin: 0 auto 22px;
}

.page-header .lead {
  margin: 0 auto;
}

/* ==========================================================================
   Cards & Features
   ========================================================================== */

.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 36px;
  box-shadow: none;
  transition: all 0.25s ease;
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--color-terracotta);
  transition: width 0.3s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-terracotta);
}

.card:hover::before {
  width: 100%;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--color-peach);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--color-terracotta);
  border: 1px solid rgba(8, 145, 178, 0.15);
}

.card h3 { margin-bottom: 12px; }

.card p {
  color: var(--color-muted);
  margin-bottom: 0;
  font-size: 0.97rem;
}

/* Pillar cards */
.pillar {
  text-align: left;
  padding: 40px 32px;
  border-radius: var(--radius-md);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  position: relative;
  transition: all 0.25s ease;
}

.pillar:hover {
  border-color: var(--color-ink);
  transform: translateY(-3px);
}

.pillar-number {
  font-family: var(--font-sans);
  font-style: normal;
  color: var(--color-terracotta);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  margin-bottom: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pillar-number::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* Product card */
.product-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  margin-bottom: 120px;
}

.product-card:last-child { margin-bottom: 0; }

.product-card.reversed .product-card-visual { order: 2; }

.product-card-visual {
  aspect-ratio: 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-sage-dark), var(--color-sage));
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
  position: relative;
}

.product-card-visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.product-card-visual svg {
  width: 70%;
  height: 70%;
  position: relative;
  z-index: 1;
}

.product-card-content .eyebrow { margin-bottom: 14px; }
.product-card-content h2 { margin-bottom: 22px; }

.product-features {
  list-style: none;
  margin-top: 28px;
  border-top: 1px solid var(--color-border);
}

.product-features li {
  padding: 18px 0 18px 28px;
  position: relative;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.product-features li::before {
  content: "+";
  position: absolute;
  left: 0;
  top: 18px;
  width: 18px;
  height: 18px;
  color: var(--color-terracotta);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  text-align: left;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-white);
}

.stats > div {
  padding: 40px 32px;
  border-right: 1px solid var(--color-border);
  position: relative;
}

.stats > div:last-child { border-right: none; }

.stat-number {
  font-family: var(--font-sans);
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--color-ink);
  line-height: 1;
  display: block;
  margin-bottom: 12px;
  letter-spacing: -0.04em;
  background: linear-gradient(135deg, var(--color-ink), var(--color-terracotta));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  color: var(--color-muted);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
}

/* Story / Quote */
.story {
  background: var(--color-sage-dark);
  color: #cbd5e1;
  border-radius: var(--radius-lg);
  padding: 56px;
  position: relative;
  border: 1px solid var(--color-sage);
  overflow: hidden;
}

.story::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.story-quote {
  font-family: var(--font-sans);
  font-size: 1.35rem;
  font-style: normal;
  font-weight: 500;
  line-height: 1.55;
  color: var(--color-white);
  margin-bottom: 28px;
  letter-spacing: -0.01em;
  position: relative;
  z-index: 1;
}

.story-quote::before {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-teal);
  margin-bottom: 24px;
}

.story-author {
  display: flex;
  align-items: center;
  gap: 16px;
  color: #94a3b8;
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

.story-author-mark {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-teal), var(--color-terracotta));
}

/* Timeline */
.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: 40px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1.5px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-item:last-child { margin-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--color-terracotta);
  box-shadow: 0 0 0 4px var(--color-white);
}

.timeline-year {
  font-family: var(--font-sans);
  font-style: normal;
  color: var(--color-terracotta);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.timeline-item h4 { margin-bottom: 10px; }

.timeline-item p { color: var(--color-muted); font-size: 0.95rem; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 72px;
}

.contact-info-item {
  display: flex;
  gap: 18px;
  margin-bottom: 32px;
  align-items: flex-start;
}

.contact-info-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--color-peach);
  color: var(--color-terracotta);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(8, 145, 178, 0.15);
}

.contact-info-item h4 { margin-bottom: 6px; }

.contact-info-item a {
  color: var(--color-ink);
  font-weight: 600;
}

.contact-form {
  background: var(--color-white);
  padding: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 22px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.01em;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 13px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  background: var(--color-white);
  color: var(--color-ink);
  transition: all 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-terracotta);
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.1);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
  font-family: inherit;
}

/* Callout */
.callout {
  background: var(--color-sage-dark);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-sage);
}

.callout::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.callout::after {
  content: "";
  position: absolute;
  bottom: -150px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.callout > * { position: relative; z-index: 1; }

.callout h2 { color: var(--color-white); margin-bottom: 18px; }

.callout .lead {
  color: #cbd5e1;
  margin: 0 auto 36px;
}

.callout .btn-primary {
  background: var(--color-teal);
  color: var(--color-ink);
}

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

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-sage-dark);
  color: #94a3b8;
  padding: 80px 0 32px;
  border-top: 1px solid var(--color-sage);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 56px;
  margin-bottom: 56px;
}

.site-footer h4 {
  color: var(--color-white);
  margin-bottom: 22px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-family: var(--font-sans);
  font-weight: 700;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-white);
  font-family: var(--font-sans);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.footer-brand .nav-brand-mark {
  width: 36px;
  height: 36px;
  background: var(--color-white);
  color: var(--color-ink);
}

.footer-brand .nav-brand-mark::after {
  background: var(--color-teal);
  border-color: var(--color-sage-dark);
}

.footer-about {
  color: #94a3b8;
  font-size: 0.92rem;
  line-height: 1.65;
}

.footer-list {
  list-style: none;
}

.footer-list li { margin-bottom: 11px; }

.footer-list a {
  color: #94a3b8;
  font-size: 0.92rem;
  font-weight: 400;
}

.footer-list a:hover { color: var(--color-teal); }

.footer-bottom {
  border-top: 1px solid var(--color-sage);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.82rem;
  color: #64748b;
}

/* ==========================================================================
   Language visibility
   ========================================================================== */

html[lang="en"] [lang="zh"] { display: none; }
html[lang="zh"] [lang="en"] { display: none; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 960px) {
  :root { --section-padding: 80px; }

  .hero { padding: 72px 0 96px; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .hero-visual { max-width: 460px; margin: 0 auto; }

  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }

  .product-card { grid-template-columns: 1fr; gap: 40px; margin-bottom: 80px; }
  .product-card.reversed .product-card-visual { order: 0; }

  .contact-grid { grid-template-columns: 1fr; gap: 48px; }

  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }

  .stats { grid-template-columns: repeat(2, 1fr); border-right: none; }
  .stats > div:nth-child(2) { border-right: none; }
  .stats > div:nth-child(1),
  .stats > div:nth-child(2) { border-bottom: 1px solid var(--color-border); }
}

@media (max-width: 640px) {
  :root { --section-padding: 64px; }

  .container { padding: 0 20px; }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-white);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu.open { display: flex; }

  .nav-toggle { display: block; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }

  .callout { padding: 48px 28px; }

  .story { padding: 36px 28px; }

  .contact-form { padding: 28px; }

  .footer-grid { grid-template-columns: 1fr; gap: 40px; }

  .stats { grid-template-columns: 1fr; }
  .stats > div { border-right: none; border-bottom: 1px solid var(--color-border); }
  .stats > div:last-child { border-bottom: none; }
}