/* ==========================================================================
   Scarp Protocol — Style
   Palette derived from geological strata (escarpment hero image)
   ========================================================================== */

:root {
  /* Geological palette */
  --deep-slate: #1B2838;
  --dark-teal: #2A4A4E;
  --strata-teal: #3A6B5E;
  --strata-blue: #6B8494;
  --sandstone: #C4A265;
  --sandstone-light: #D4B87A;

  /* Functional colors */
  --bg-dark: #1B2838;
  --bg-dark-alt: #1F2F42;
  --bg-light: #F5F3EF;
  --bg-light-alt: #ECEAE4;
  --text-on-dark: #E8E4DC;
  --text-on-dark-muted: #9BA8B4;
  --text-on-light: #2C2C2C;
  --text-on-light-muted: #6B6B6B;
  --border-light: #D4D0C8;
  --border-dark: #2E4050;

  /* Layer colors (mapped to strata) */
  --layer-settlement: #1B2838;
  --layer-governance: #2A5A5E;
  --layer-cooperation: #6B8494;
  --layer-identity: #C4A265;

  /* Typography */
  --font-display: 'Source Serif 4', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-pad: 5rem;
  --container-width: 1140px;
  --container-narrow: 780px;
}

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

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

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

body {
  font-family: var(--font-body);
  color: var(--text-on-light);
  background: var(--bg-light);
  line-height: 1.7;
}

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

a {
  color: var(--strata-teal);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--sandstone); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.25;
  font-weight: 600;
}

h1 { font-size: 2.75rem; }
h2 { font-size: 1.75rem; margin-bottom: 1.25rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.75rem; }
h4 { font-size: 1.1rem; margin-bottom: 0.5rem; font-family: var(--font-body); font-weight: 600; }

p { margin-bottom: 1.25rem; }
p:last-child { margin-bottom: 0; }

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

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.container-narrow {
  max-width: var(--container-narrow);
}

/* ==========================================================================
   Sections — alternating dark/light
   ========================================================================== */

.section-dark {
  background: var(--bg-dark);
  color: var(--text-on-dark);
  padding: var(--section-pad) 0;
}

.section-dark a { color: var(--sandstone-light); }
.section-dark a:hover { color: #E8CC8E; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .text-muted { color: var(--text-on-dark-muted); }

.section-dark-alt {
  background: var(--bg-dark-alt);
  color: var(--text-on-dark);
  padding: var(--section-pad) 0;
}
.section-dark-alt a { color: var(--sandstone-light); }
.section-dark-alt a:hover { color: #E8CC8E; }
.section-dark-alt h2, .section-dark-alt h3 { color: #fff; }
.section-dark-alt .text-muted { color: var(--text-on-dark-muted); }

.section-light {
  background: var(--bg-light);
  color: var(--text-on-light);
  padding: var(--section-pad) 0;
}

.section-light-alt {
  background: var(--bg-light-alt);
  color: var(--text-on-light);
  padding: var(--section-pad) 0;
}

.section-accent {
  background: var(--dark-teal);
  color: var(--text-on-dark);
  padding: var(--section-pad) 0;
}
.section-accent h2, .section-accent h3 { color: #fff; }
.section-accent a { color: var(--sandstone-light); }

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(27, 40, 56, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-dark);
}

.site-nav {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff !important;
  letter-spacing: 0.02em;
}
.nav-logo:hover { color: var(--sandstone-light) !important; }

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-on-dark-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active {
  color: #fff;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  transition: 0.2s;
}

/* ==========================================================================
   Hero — Landing page with escarpment background
   ========================================================================== */

.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  background: var(--bg-dark);
  overflow: hidden;
  padding-top: 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/hero-escarpment.jpg') center center / cover no-repeat;
  opacity: 0.4;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(27, 40, 56, 0.7) 0%,
    rgba(27, 40, 56, 0.5) 50%,
    rgba(27, 40, 56, 0.9) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 4rem 2rem;
}

.hero h1 {
  font-size: 3.25rem;
  color: #fff;
  max-width: 720px;
  margin-bottom: 1.5rem;
  line-height: 1.15;
}

.hero .lead {
  font-size: 1.25rem;
  color: var(--text-on-dark);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Page hero (non-landing pages) */
.page-hero {
  background: var(--bg-dark);
  color: var(--text-on-dark);
  padding: calc(var(--section-pad) + 64px) 0 var(--section-pad);
}

.page-hero h1 {
  color: #fff;
  margin-bottom: 1rem;
}

.page-hero .lead {
  font-size: 1.15rem;
  color: var(--text-on-dark);
  max-width: 640px;
  opacity: 0.85;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 3px;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn-primary {
  background: var(--sandstone);
  color: var(--bg-dark);
}
.btn-primary:hover {
  background: var(--sandstone-light);
  color: var(--bg-dark);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: #fff;
  color: #fff;
}

/* Outline buttons on light backgrounds */
.section-light .btn-outline,
.section-light-alt .btn-outline {
  color: var(--bg-dark);
  border-color: var(--bg-dark);
}
.section-light .btn-outline:hover,
.section-light-alt .btn-outline:hover {
  background: var(--bg-dark);
  color: #fff;
}

/* ---------- FIX 1.3: Button contrast overrides for dark/accent sections ----------
   Section-level anchor rules (.section-dark a, .section-accent a) override
   button text color. These specificity overrides restore correct button colors
   in every section type. */

.section-dark .btn-primary,
.section-dark-alt .btn-primary,
.section-accent .btn-primary {
  color: var(--bg-dark) !important;
}
.section-dark .btn-primary:hover,
.section-dark-alt .btn-primary:hover,
.section-accent .btn-primary:hover {
  color: var(--bg-dark) !important;
}

.section-dark .btn-outline,
.section-dark-alt .btn-outline,
.section-accent .btn-outline {
  color: #fff !important;
  border-color: rgba(255,255,255,0.5);
}
.section-dark .btn-outline:hover,
.section-dark-alt .btn-outline:hover,
.section-accent .btn-outline:hover {
  color: #fff !important;
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}

.section-light .btn-primary,
.section-light-alt .btn-primary {
  color: var(--bg-dark) !important;
}

/* ==========================================================================
   Four-layer substrate diagram
   ========================================================================== */

/* ---------- FIX 1.1: Light background island for the layer diagram ----------
   Prevents the dark section background from bleeding through the rgba
   layer-band colors. Cream background matches the original SVG design. */

.layers-diagram {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 720px;
  margin: 2rem auto;
  background: #F5F3EF;
  border-radius: 6px;
  overflow: hidden;
  padding: 0;
}

.layer-band {
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-left: 4px solid;
}

.layer-band:nth-child(1) {
  background: rgba(196, 162, 101, 0.2);
  border-color: var(--sandstone);
}
.layer-band:nth-child(2) {
  background: rgba(107, 132, 148, 0.18);
  border-color: var(--strata-blue);
}
.layer-band:nth-child(3) {
  background: rgba(42, 90, 94, 0.18);
  border-color: #4A9A8E;
}
.layer-band:nth-child(4) {
  background: rgba(80, 100, 130, 0.15);
  border-color: #7A8EA0;
}

.layer-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  min-width: 140px;
}

/* ---------- Layer text on light background ----------
   Layer descriptions need dark text now that the diagram sits on cream. */

.layer-desc {
  font-size: 0.95rem;
  color: #555;
  flex: 1;
}

/* ---------- FIX 1.2: Badge contrast on light background ----------
   Solid dark badges with white text, readable on the cream diagram. */

.layer-status {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 2px;
  white-space: nowrap;
  margin-left: 1rem;
}

.layer-status.shipped {
  background: #2E8B57;
  color: #fff;
}
.layer-status.specified {
  background: #6B8494;
  color: #fff;
}

/* Four-questions grid forced 2x2 */
.feature-grid-2x2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin: 2rem 0;
}

/* Design boundary / A2A questions */
.boundary-item {
  padding: 2rem;
  border-radius: 4px;
  margin-bottom: 1.5rem;
}

.section-dark .boundary-item,
.section-dark-alt .boundary-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-dark);
}

.section-light .boundary-item,
.section-light-alt .boundary-item {
  background: #fff;
  border: 1px solid var(--border-light);
}

.boundary-item h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.boundary-scenario {
  font-size: 0.95rem;
  line-height: 1.65;
  font-style: italic;
  margin-bottom: 0.75rem;
}

.section-dark .boundary-scenario {
  color: var(--text-on-dark-muted);
}

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

/* Layer description blocks on landing page */
.layer-detail {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border-dark);
}

.layer-detail:last-child {
  border-bottom: none;
}

.layer-detail h3 {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Use case full-width cards */
.use-case-card {
  padding: 2.5rem;
  border-radius: 4px;
  margin-bottom: 2rem;
}

.section-light .use-case-card {
  background: #fff;
  border: 1px solid var(--border-light);
}

.section-dark .use-case-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-dark);
}

.use-case-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

/* Court case callout boxes */
.case-callout {
  padding: 1.5rem 2rem;
  border-radius: 4px;
  margin: 1.5rem 0;
  border-left: 3px solid var(--sandstone);
}

.section-dark .case-callout {
  background: rgba(196, 162, 101, 0.08);
}

.section-light .case-callout {
  background: rgba(196, 162, 101, 0.06);
}

.case-callout .case-name {
  font-weight: 600;
  margin-bottom: 0.5rem;
}

/* ==========================================================================
   Comparison table
   ========================================================================== */

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.comparison-table th {
  text-align: left;
  padding: 0.85rem 1rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
}

.section-dark .comparison-table th {
  border-bottom: 2px solid var(--border-light);
  color: var(--text-on-light-muted);
}

.section-light .comparison-table th {
  border-bottom: 2px solid var(--border-light);
  color: var(--text-on-light-muted);
}

.comparison-table td {
  padding: 0.85rem 1rem;
  vertical-align: top;
}

.section-dark .comparison-table td {
  border-bottom: 1px solid var(--border-dark);
}

.section-light .comparison-table td {
  border-bottom: 1px solid var(--border-light);
}

.comparison-table .gap-cell {
  color: #C97A6A;
}

/* ==========================================================================
   Feature grid (capabilities, use cases)
   ========================================================================== */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.feature-card {
  padding: 1.75rem;
  border-radius: 4px;
}

.section-dark .feature-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-dark);
}

.section-light .feature-card,
.section-light-alt .feature-card {
  background: #fff;
  border: 1px solid var(--border-light);
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
}

.feature-card p {
  font-size: 0.95rem;
  line-height: 1.65;
}

.section-dark .feature-card p {
  color: var(--text-on-dark-muted);
}

.section-light .feature-card p,
.section-light-alt .feature-card p {
  color: var(--text-on-light-muted);
}

.feature-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
  display: block;
}

/* ==========================================================================
   Hub-and-spoke SVG diagram
   ========================================================================== */

.diagram-container {
  margin: 2.5rem auto;
  max-width: 900px;
  overflow-x: auto;
}

.diagram-container svg {
  width: 100%;
  height: auto;
}

/* ==========================================================================
   Worked example / flow
   ========================================================================== */

.flow-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 2rem 0;
  position: relative;
}

.flow-step {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem 0;
  position: relative;
}

.flow-step:not(:last-child) {
  border-bottom: 1px solid var(--border-dark);
}

.flow-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--sandstone);
  min-width: 3rem;
  line-height: 1;
  padding-top: 0.25rem;
}

.flow-content h4 {
  color: #fff;
  margin-bottom: 0.4rem;
}

.flow-content p {
  color: var(--text-on-dark-muted);
  font-size: 0.95rem;
}

.flow-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--strata-teal);
  letter-spacing: 0.03em;
  margin-bottom: 0.25rem;
}

/* ==========================================================================
   Insights / blog listing
   ========================================================================== */

.insight-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.insight-item {
  padding: 2rem;
  border-radius: 4px;
}

.section-light .insight-item {
  background: #fff;
  border: 1px solid var(--border-light);
}

.insight-item h3 a {
  color: var(--text-on-light);
}
.insight-item h3 a:hover {
  color: var(--strata-teal);
}

.insight-meta {
  font-size: 0.85rem;
  color: var(--text-on-light-muted);
  margin-bottom: 0.5rem;
}

.insight-type {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  background: var(--bg-light-alt);
  color: var(--text-on-light-muted);
  margin-right: 0.5rem;
}

/* ==========================================================================
   Post body
   ========================================================================== */

.post-body h2 {
  margin-top: 2.5rem;
  font-size: 1.6rem;
}

.post-body h3 {
  margin-top: 2rem;
}

.post-body p {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.8;
}

.post-body blockquote {
  border-left: 3px solid var(--sandstone);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--text-on-light-muted);
}

.post-date {
  font-size: 0.9rem;
  color: var(--text-on-dark-muted);
  margin-bottom: 0.5rem;
}

.post-subtitle {
  font-size: 1.15rem;
  color: var(--text-on-dark-muted);
  margin-top: 0.75rem;
}

/* ==========================================================================
   Contact page
   ========================================================================== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin: 2rem 0;
}

.contact-path {
  padding: 2rem;
  border-radius: 4px;
}

.section-light .contact-path {
  background: #fff;
  border: 1px solid var(--border-light);
}

.contact-path h3 {
  margin-bottom: 1rem;
}

.contact-email {
  font-size: 1.1rem;
  font-weight: 600;
}

/* ==========================================================================
   Standards alignment badges
   ========================================================================== */

/* ---------- FIX 1.5: Uniform badge grid, 4x2 ----------
   Replaces flexbox with CSS grid so all 8 badges render at equal width. */

.standards-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin: 2rem 0;
}

/* Narrow containers (contact page): badges fill available width */
.container-narrow .standards-bar {
  grid-template-columns: repeat(2, 1fr);
}

.standard-badge {
  padding: 0.5rem 1rem;
  border-radius: 3px;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}

.section-dark .standard-badge {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border-dark);
  color: var(--text-on-dark-muted);
}

.section-light .standard-badge {
  background: var(--bg-light-alt);
  border: 1px solid var(--border-light);
  color: var(--text-on-light-muted);
}

/* ==========================================================================
   Deployment custody table
   ========================================================================== */

.custody-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.custody-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-bottom: 2px solid var(--border-light);
  color: var(--sandstone);
}

/* ---------- FIX 1.4: Custody table text visibility ----------
   Changed from --text-on-dark-muted (#9BA8B4) to --text-on-dark (#E8E4DC)
   so table cell text is clearly readable on the dark background. */

.custody-table td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: #333;
}

.custody-table td:first-child {
  color: #2C2C2C;
  font-weight: 500;
}

.custody-check {
  color: #7FC4A8;
  font-weight: 600;
}

/* ==========================================================================
   Utility
   ========================================================================== */

.text-muted { color: var(--text-on-light-muted); }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 2rem; }

.section-intro {
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.section-intro p {
  font-size: 1.05rem;
  line-height: 1.7;
}

.section-dark .section-intro p {
  color: var(--text-on-dark-muted);
}

.eyebrow {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 1.25rem;
  display: block;
}

.section-dark .eyebrow { color: var(--sandstone); }
.section-light .eyebrow { color: var(--strata-teal); }

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

.site-footer {
  background: #141E2B;
  color: var(--text-on-dark-muted);
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-main {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff !important;
  display: inline-block;
  margin-bottom: 1rem;
}

.footer-tagline {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-on-dark-muted);
  margin-bottom: 1.25rem;
  max-width: 280px;
}

.footer-patent {
  font-size: 0.8rem;
  line-height: 1.5;
  color: rgba(155,168,180,0.6);
}

.footer-nav-col h4 {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  margin-bottom: 1.25rem;
}

.footer-nav-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav-col li {
  margin-bottom: 0.65rem;
}

.footer-nav-col a {
  font-size: 0.9rem;
  color: var(--text-on-dark-muted);
  transition: color 0.2s;
}

.footer-nav-col a:hover {
  color: #fff;
}

.footer-bottom {
  padding: 1.5rem 0;
}

.footer-bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(155,168,180,0.5);
  margin: 0;
}

.footer-legal {
  display: flex;
  gap: 1.5rem;
}

.footer-legal a {
  font-size: 0.8rem;
  color: rgba(155,168,180,0.5);
  transition: color 0.2s;
}

.footer-legal a:hover {
  color: var(--text-on-dark-muted);
}

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

@media (max-width: 768px) {
  :root {
    --section-pad: 3rem;
  }

  .nav-links { display: none; }
  .nav-toggle { display: flex; }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 2rem;
    gap: 0.75rem;
  }

  .hero h1 { font-size: 2.25rem; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }

  .feature-grid {
    grid-template-columns: 1fr;
  }

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

  .feature-grid-2x2 {
    grid-template-columns: 1fr;
  }

  .layer-band {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .layer-status { margin-left: 0; margin-top: 0.25rem; }

  .flow-step { flex-direction: column; gap: 0.5rem; }

  .comparison-table { font-size: 0.85rem; }
  .comparison-table th, .comparison-table td { padding: 0.6rem 0.5rem; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  .footer-brand-col {
    grid-column: 1 / -1;
  }

  .footer-tagline {
    max-width: none;
  }

  .footer-bottom-inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }

  /* Standards badges stack to 2 columns on mobile */
  .standards-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}