/* ==========================================================================
   NICKEL-WIRE.COM — The NP1 Nickel Wire Intelligence Platform
   Design System: Industrial precision meets scientific credibility
   ========================================================================== */

/* ------ 1. Reset & Base ------ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'IBM Plex Sans', 'Source Sans Pro', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: #1A1A2E;
  background-color: #F7F8FA;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #3D6B8A; text-decoration: none; transition: color 0.2s ease; }
a:hover { color: #2C5F7A; text-decoration: underline; }
ul, ol { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }

/* ------ 2. Typography ------ */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Libre Baskerville', 'Source Serif Pro', Georgia, serif;
  color: #1A1A2E;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); margin-bottom: 1.5rem; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.3rem); margin: 3rem 0 1.25rem; }
h3 { font-size: clamp(1.3rem, 2.4vw, 1.55rem); margin: 2rem 0 1rem; }
h4 { font-size: 1.15rem; margin: 1.5rem 0 0.75rem; }
p { margin-bottom: 1.1rem; }
strong { color: #0D1B2A; font-weight: 600; }
code, .mono, .data-value {
  font-family: 'IBM Plex Mono', 'Menlo', 'Courier New', monospace;
  font-size: 0.95em;
}

/* ------ 3. Layout Containers ------ */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.reading-column { max-width: 720px; margin: 0 auto; padding: 0 1.5rem; }
.wide-column { max-width: 1080px; margin: 0 auto; padding: 0 1.5rem; }
section { padding: 4.5rem 0; }
.section-tight { padding: 3rem 0; }

/* ------ 4. Header / Navigation ------ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  background-color: rgba(247, 248, 250, 0.97);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}
.site-header.scrolled {
  box-shadow: 0 2px 14px rgba(13, 27, 42, 0.06);
  border-bottom-color: #E2E5EA;
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 78px;
  padding-top: 0.6rem; padding-bottom: 0.6rem;
}
.brand { display: flex; flex-direction: column; line-height: 1.1; color: #0D1B2A; }
.brand:hover { text-decoration: none; color: #0D1B2A; }
.brand-wordmark {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600; font-size: 1.25rem;
  letter-spacing: 0.08em;
  position: relative; padding-bottom: 4px;
}
.brand-wordmark::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: linear-gradient(90deg, #3D6B8A 0%, #B87333 100%);
}
.brand-tagline {
  font-size: 0.62rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: #3D6B8A; margin-top: 4px; font-weight: 500;
}
.main-nav ul { display: flex; list-style: none; padding: 0; margin: 0; gap: 2rem; }
.main-nav li { margin: 0; }
.main-nav a {
  font-size: 0.92rem; font-weight: 500; color: #1A1A2E;
  padding: 0.4rem 0; position: relative; letter-spacing: 0.01em;
}
.main-nav a:hover { color: #3D6B8A; text-decoration: none; }
.main-nav a.active, .main-nav a[aria-current="page"] { color: #3D6B8A; }
.main-nav a.active::after, .main-nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 2px; background-color: #B87333;
}
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 0.5rem; width: 44px; height: 44px;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background-color: #1A1A2E; position: relative;
  transition: background 0.2s;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0;
  width: 24px; height: 2px; background-color: #1A1A2E;
  transition: transform 0.25s ease;
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
.nav-toggle.is-open span { background: transparent; }
.nav-toggle.is-open span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span::after  { transform: translateY(-7px) rotate(-45deg); }

/* ------ 5. Hero ------ */
.hero {
  background-color: #0D1B2A; color: #E2E5EA;
  padding: 10rem 0 6rem; position: relative; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(61, 107, 138, 0.18) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 70%, rgba(184, 115, 51, 0.08) 0%, transparent 55%);
  pointer-events: none;
}
.hero > .container { position: relative; z-index: 1; }
.hero h1 {
  color: #F7F8FA;
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  line-height: 1.1; margin-bottom: 1.75rem; letter-spacing: -0.015em;
}
.hero h1 .line-break { display: block; }
.hero h1 .accent-line { color: #B87333; }
.hero-sub {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem); line-height: 1.6;
  max-width: 780px; color: #C7CCD6; margin-bottom: 1.5rem;
}
.hero-body { font-size: 1rem; max-width: 780px; color: #9BA3B0; margin-bottom: 2.5rem; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 4rem; }
.hero-compact { padding: 8rem 0 3.5rem; }
.hero-compact h1 { font-size: clamp(2rem, 4.5vw, 3rem); margin-bottom: 1rem; }
.hero-compact .hero-sub { font-size: 1.1rem; margin-bottom: 0; }

/* ------ 6. Buttons ------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.9rem 1.75rem;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.95rem; font-weight: 500; letter-spacing: 0.02em;
  border-radius: 2px; border: 1px solid transparent; cursor: pointer;
  transition: all 0.2s ease; text-decoration: none; line-height: 1.2;
}
.btn-primary { background-color: #B87333; color: #FFF; border-color: #B87333; }
.btn-primary:hover { background-color: #A0621F; border-color: #A0621F; color: #FFF; text-decoration: none; transform: translateY(-1px); }
.btn-outline-light { background-color: transparent; color: #F7F8FA; border-color: rgba(247,248,250,0.5); }
.btn-outline-light:hover { background-color: rgba(247,248,250,0.08); border-color: #F7F8FA; color: #F7F8FA; text-decoration: none; }
.btn-outline { background-color: transparent; color: #3D6B8A; border-color: #3D6B8A; }
.btn-outline:hover { background-color: #3D6B8A; color: #FFF; text-decoration: none; }
.btn-arrow::after { content: " →"; margin-left: 0.35rem; }

/* ------ 7. Stat Bar ------ */
.stat-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border-top: 1px solid rgba(226, 229, 234, 0.15); padding-top: 2.5rem;
}
.stat { padding: 0 1.5rem; border-right: 1px solid rgba(226, 229, 234, 0.15); text-align: left; }
.stat:last-child { border-right: none; }
.stat-value {
  font-family: 'IBM Plex Mono', monospace;
  font-size: clamp(1.6rem, 3vw, 2.35rem);
  font-weight: 500; color: #F7F8FA; line-height: 1.1;
  margin-bottom: 0.5rem; letter-spacing: -0.01em;
}
.stat-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.12em; color: #9BA3B0; font-weight: 500; }

/* ------ 8. Section helpers ------ */
.section-eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.18em;
  color: #B87333; margin-bottom: 1rem; font-weight: 500;
}
.section-intro { max-width: 760px; margin: 0 auto 3rem; text-align: center; }
.section-intro h2 { margin-top: 0; }
.section-intro p { font-size: 1.1rem; color: #3A3F4B; }
hr, .rule { border: none; border-top: 1px solid #E2E5EA; margin: 4rem auto; max-width: 1080px; }

/* ------ 9. Three-col ------ */
.three-col {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem; max-width: 1080px; margin: 0 auto;
}
.three-col h3 {
  font-size: 1.2rem; margin-top: 0; margin-bottom: 1rem;
  padding-bottom: 0.75rem; border-bottom: 2px solid #B87333;
  display: inline-block;
}
.three-col p { font-size: 0.97rem; line-height: 1.65; color: #3A3F4B; }

/* ------ 10. App card grid ------ */
.app-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem; max-width: 1200px; margin: 0 auto;
}
.app-card {
  background-color: #FFF; border: 1px solid #E2E5EA;
  padding: 2rem 1.75rem; transition: all 0.25s ease;
  display: flex; flex-direction: column;
  border-top: 3px solid #3D6B8A;
}
.app-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(13, 27, 42, 0.08);
  border-top-color: #B87333;
}
.app-card-icon { width: 44px; height: 44px; margin-bottom: 1.25rem; color: #3D6B8A; }
.app-card-icon svg { width: 100%; height: 100%; }
.app-card h3 { font-size: 1.25rem; margin: 0 0 0.5rem; }
.app-card-meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.8rem; color: #2C5F7A;
  margin-bottom: 1rem; padding-bottom: 1rem;
  border-bottom: 1px dashed #E2E5EA;
}
.app-card p { font-size: 0.95rem; line-height: 1.6; color: #3A3F4B; margin-bottom: 1.25rem; flex-grow: 1; }
.app-card-link { font-size: 0.9rem; font-weight: 500; color: #3D6B8A; margin-top: auto; }
.app-card-link:hover { color: #B87333; }
.app-card-link::after { content: " →"; }

/* ------ 11. Tables ------ */
.data-table-wrap { overflow-x: auto; margin: 2rem 0; border: 1px solid #E2E5EA; background-color: #FFF; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
.data-table thead th {
  background-color: #0D1B2A; color: #F7F8FA;
  text-align: left; padding: 1rem 1.25rem;
  font-weight: 600; font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em;
  border-bottom: 2px solid #2C5F7A;
}
.data-table tbody td { padding: 0.9rem 1.25rem; border-bottom: 1px solid #E2E5EA; vertical-align: top; }
.data-table tbody tr:nth-child(even) { background-color: #FAFBFC; }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background-color: #F0F3F7; }
.data-table td.numeric, .data-table td .data-value {
  font-family: 'IBM Plex Mono', monospace; color: #2C5F7A; font-weight: 500;
}

/* ------ 12. Validation grid ------ */
.validation-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem; max-width: 1080px; margin: 2.5rem auto 0;
}
.inst-tile {
  background-color: #FFF; border: 1px solid #E2E5EA;
  border-left: 3px solid #2C5F7A; padding: 1.5rem 1.25rem;
}
.inst-tile h4 { font-family: 'Libre Baskerville', serif; font-size: 1.05rem; margin: 0 0 0.4rem; color: #0D1B2A; }
.inst-tile .loc {
  font-size: 0.8rem; color: #3D6B8A;
  font-family: 'IBM Plex Mono', monospace;
  margin-bottom: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em;
}
.inst-tile p { font-size: 0.88rem; line-height: 1.55; color: #3A3F4B; margin: 0; }

/* ------ 13. Breadcrumb ------ */
.breadcrumb { padding: 1.25rem 0 0; font-size: 0.85rem; color: #5C6370; font-family: 'IBM Plex Mono', monospace; }
.breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.breadcrumb li { margin: 0; }
.breadcrumb li + li::before { content: "→"; margin-right: 0.5rem; color: #A0A6B2; }
.breadcrumb a { color: #3D6B8A; }
.breadcrumb [aria-current="page"] { color: #1A1A2E; }

/* ------ 14. ALKN bridge ------ */
.alkn-bridge {
  max-width: 860px; margin: 2rem auto;
  background: linear-gradient(180deg, #FFF 0%, #FAFBFC 100%);
  border: 1px solid #E2E5EA; border-left: 4px solid #B87333;
  padding: 2.25rem 2rem;
}
.alkn-bridge h3 { margin-top: 0; font-size: 1.4rem; color: #0D1B2A; }
.alkn-bridge p { font-size: 0.98rem; color: #3A3F4B; line-height: 1.65; }
.alkn-bridge .compliance-note {
  font-size: 0.8rem; color: #6B7280; margin-top: 1.25rem;
  padding-top: 1rem; border-top: 1px dashed #E2E5EA; font-style: italic;
}

/* ------ 15. Property rows ------ */
.property-row {
  display: grid; grid-template-columns: 280px 1fr;
  gap: 2.5rem; padding: 2rem 0; border-bottom: 1px solid #E2E5EA;
}
.property-row:last-child { border-bottom: none; }
.property-row h3 { margin: 0; font-size: 1.25rem; color: #2C5F7A; font-family: 'Libre Baskerville', serif; }
.property-row p { margin: 0; font-size: 0.98rem; line-height: 1.7; color: #3A3F4B; }

/* ------ 16. Process diagram ------ */
.process-diagram {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem; flex-wrap: wrap; margin: 2.5rem 0;
}
.process-step {
  flex: 1 1 180px; background-color: #FFF; border: 1px solid #E2E5EA;
  border-top: 3px solid #3D6B8A; padding: 1.25rem 1rem;
  text-align: center; position: relative; min-width: 160px;
}
.process-step-num { font-family: 'IBM Plex Mono', monospace; font-size: 0.75rem; color: #B87333; letter-spacing: 0.15em; margin-bottom: 0.5rem; }
.process-step h4 { font-size: 0.98rem; margin: 0; font-family: 'IBM Plex Sans', sans-serif; color: #1A1A2E; font-weight: 600; }
.process-arrow { color: #B87333; font-size: 1.25rem; flex: 0 0 auto; }

/* ------ 17. Diameter compare ------ */
.diameter-compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
  max-width: 720px; margin: 2.5rem auto; padding: 2rem;
  background-color: #FFF; border: 1px solid #E2E5EA;
}
.diameter-visual { text-align: center; }
.diameter-circle {
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #C7CCD6 0%, #5C6370 70%);
  margin: 0 auto 1rem; box-shadow: inset -3px -3px 8px rgba(0,0,0,0.2);
}
.diameter-circle.big { width: 120px; height: 120px; }
.diameter-circle.small { width: 60px; height: 60px; }
.diameter-visual .label { font-family: 'IBM Plex Mono', monospace; font-size: 0.9rem; color: #2C5F7A; font-weight: 500; }
.diameter-visual .meta { font-size: 0.78rem; color: #5C6370; margin-top: 0.35rem; }

/* ------ 18. FAQ ------ */
.faq-list { max-width: 820px; margin: 2rem auto 0; }
.faq-item { border-bottom: 1px solid #E2E5EA; }
.faq-item:first-child { border-top: 1px solid #E2E5EA; }
.faq-question {
  width: 100%; text-align: left; padding: 1.25rem 0;
  background: none; border: none; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'Libre Baskerville', serif; font-size: 1.05rem;
  color: #1A1A2E; font-weight: 700; gap: 1rem;
}
.faq-question:hover { color: #3D6B8A; }
.faq-toggle { flex: 0 0 auto; width: 24px; height: 24px; position: relative; transition: transform 0.25s ease; }
.faq-toggle::before, .faq-toggle::after {
  content: ""; position: absolute; background-color: #3D6B8A; transition: transform 0.25s ease;
}
.faq-toggle::before { top: 11px; left: 4px; right: 4px; height: 2px; }
.faq-toggle::after { top: 4px; bottom: 4px; left: 11px; width: 2px; }
.faq-item.is-open .faq-toggle::after { transform: scaleY(0); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease; }
.faq-answer-inner { padding: 0 0 1.5rem; color: #3A3F4B; font-size: 0.98rem; line-height: 1.7; }

/* ------ 19. News ------ */
.article-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem; max-width: 1200px; margin: 0 auto;
}
.article-card {
  background-color: #FFF; border: 1px solid #E2E5EA;
  padding: 1.75rem; display: flex; flex-direction: column;
  transition: all 0.25s ease;
}
.article-card:hover { border-color: #3D6B8A; box-shadow: 0 8px 24px rgba(13, 27, 42, 0.06); }
.article-meta {
  display: flex; gap: 1rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em;
  color: #5C6370; margin-bottom: 1rem;
}
.article-tag { color: #B87333; }
.article-card h3 { font-size: 1.2rem; margin: 0 0 1rem; line-height: 1.3; }
.article-card p { font-size: 0.94rem; line-height: 1.6; color: #3A3F4B; margin-bottom: 1.25rem; flex-grow: 1; }

/* ------ 20. Form ------ */
.form-block { max-width: 640px; margin: 2.5rem auto 0; background-color: #FFF; border: 1px solid #E2E5EA; padding: 2.25rem 2rem; }
.form-row { margin-bottom: 1.25rem; }
.form-row label {
  display: block; font-size: 0.85rem; font-weight: 500;
  margin-bottom: 0.45rem; color: #1A1A2E;
  text-transform: uppercase; letter-spacing: 0.06em;
  font-family: 'IBM Plex Mono', monospace;
}
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 0.75rem 0.9rem;
  border: 1px solid #E2E5EA; background-color: #F7F8FA;
  font-family: inherit; font-size: 0.97rem; color: #1A1A2E;
  border-radius: 2px; transition: border-color 0.2s, background-color 0.2s;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: #3D6B8A; background-color: #FFF;
  box-shadow: 0 0 0 3px rgba(61, 107, 138, 0.1);
}
.form-row textarea { min-height: 140px; resize: vertical; }

/* ------ 21. Footer ------ */
.site-footer { background-color: #0D1B2A; color: #9BA3B0; padding: 4rem 0 2rem; font-size: 0.9rem; }
.footer-top {
  display: grid; grid-template-columns: 2fr repeat(4, 1fr);
  gap: 2.5rem; padding-bottom: 3rem;
  border-bottom: 1px solid rgba(226, 229, 234, 0.1);
}
.footer-brand .brand-wordmark { color: #F7F8FA; font-size: 1.1rem; }
.footer-brand .brand-wordmark::after { background: linear-gradient(90deg, #3D6B8A 0%, #B87333 100%); }
.footer-brand .brand-tagline { color: #3D6B8A; margin-top: 6px; }
.footer-brand p { font-size: 0.85rem; line-height: 1.6; margin-top: 1rem; color: #9BA3B0; }
.footer-col h4 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.78rem; font-weight: 600; color: #F7F8FA;
  text-transform: uppercase; letter-spacing: 0.14em; margin: 0 0 1rem;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 0.55rem; }
.footer-col a { color: #9BA3B0; font-size: 0.88rem; }
.footer-col a:hover { color: #B87333; text-decoration: none; }
.footer-bottom { padding-top: 2rem; font-size: 0.8rem; color: #6B7280; text-align: center; line-height: 1.6; }
.footer-bottom a { color: #9BA3B0; }

/* ------ 22. Utility ------ */
.bg-white { background-color: #FFF; }
.bg-offwhite { background-color: #F7F8FA; }
.bg-navy { background-color: #0D1B2A; color: #E2E5EA; }
.bg-navy h1, .bg-navy h2, .bg-navy h3, .bg-navy h4 { color: #F7F8FA; }
.bg-data { background-color: #FAFBFC; }
.text-center { text-align: center; }
.text-mono { font-family: 'IBM Plex Mono', monospace; }
.mb-0 { margin-bottom: 0 !important; }
.mt-0 { margin-top: 0 !important; }
.mb-sm { margin-bottom: 0.75rem; }
.mb-md { margin-bottom: 1.5rem; }
.mb-lg { margin-bottom: 2.5rem; }
.callout {
  background-color: #FFF; border-left: 4px solid #B87333;
  padding: 1.5rem 1.75rem; margin: 2rem 0;
  font-size: 0.98rem; line-height: 1.65;
}
.callout-data { border-left-color: #2C5F7A; background-color: #F0F3F7; }
.callout h4 { margin-top: 0; color: #2C5F7A; font-size: 1.05rem; }

/* ------ 23. Fade-in ------ */
.fade-in { opacity: 0; transform: translateY(16px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}
.source-note {
  font-size: 0.82rem; color: #6B7280; font-style: italic;
  margin-top: 1.25rem; padding-left: 1rem; border-left: 2px solid #E2E5EA;
}

/* ------ 24. Responsive ------ */
@media (max-width: 1024px) {
  .three-col { grid-template-columns: 1fr; gap: 2rem; }
  .validation-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .property-row { grid-template-columns: 1fr; gap: 0.75rem; }
  .stat-bar { grid-template-columns: repeat(2, 1fr); gap: 2rem 0; }
  .stat { border-right: none; padding: 0 1rem; }
  .stat:nth-child(odd) { border-right: 1px solid rgba(226, 229, 234, 0.15); }
}
@media (max-width: 768px) {
  body { font-size: 16px; }
  section { padding: 3.5rem 0; }
  .main-nav {
    position: fixed; top: 78px; left: 0; right: 0; bottom: 0;
    background-color: #F7F8FA; transform: translateX(100%);
    transition: transform 0.3s ease;
    padding: 2rem 1.5rem; overflow-y: auto;
    border-top: 1px solid #E2E5EA;
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; gap: 0; }
  .main-nav li { border-bottom: 1px solid #E2E5EA; }
  .main-nav a { display: block; padding: 1rem 0; font-size: 1.05rem; }
  .nav-toggle { display: inline-flex; }
  .hero { padding: 8rem 0 4rem; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { width: 100%; }
  .validation-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .process-diagram { flex-direction: column; }
  .process-arrow { transform: rotate(90deg); }
  .diameter-compare { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.5rem; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.55rem; margin: 2.5rem 0 1rem; }
}
@media (max-width: 480px) {
  .container, .reading-column, .wide-column { padding: 0 1rem; }
  .stat-bar { grid-template-columns: 1fr; }
  .stat { border-right: none !important; padding: 1rem 0; border-bottom: 1px solid rgba(226,229,234,0.15); }
  .stat:last-child { border-bottom: none; }
  .alkn-bridge { padding: 1.5rem 1.25rem; }
  .form-block { padding: 1.5rem 1.25rem; }
}
@media print {
  .site-header, .nav-toggle, .hero-ctas, .site-footer { display: none; }
  body { font-size: 11pt; background: #FFF; color: #000; }
  .hero { background: #FFF; color: #000; padding: 2rem 0; }
  .hero h1 { color: #000; }
}