@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --surface: #1e1e2a;
  --surface-glow: rgba(99, 102, 241, 0.15);
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-cyan: #22d3ee;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255, 255, 255, 0.08);
  --glow: rgba(99, 102, 241, 0.5);
  --glow-cyan: rgba(34, 211, 238, 0.5);
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s ease;
}

.logo {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  cursor: pointer;
}

.logo-memres {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.logo-by {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text-primary);
}

.nav-cta {
  padding: 0.5rem 1.25rem;
  background: var(--accent-primary);
  color: white !important;
  border-radius: 8px;
  font-weight: 600 !important;
  transition: opacity 0.2s, transform 0.2s;
}

.nav-cta:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
  position: relative;
  background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(99, 102, 241, 0.2) 0%, transparent 60%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1rem;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.pulse {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  max-width: 900px;
}

.gradient {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 4rem;
}

.hero-code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem 2rem;
  text-align: left;
  max-width: 560px;
  width: 100%;
}

.hero-code pre {
  margin: 0;
}

.hero-code code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  line-height: 1.8;
  display: block;
  white-space: pre;
}

.code-comment { color: var(--text-muted); }
.code-prompt { color: var(--accent-cyan); }
.code-response { color: var(--text-secondary); }

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  background: var(--accent-primary);
  color: white;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  opacity: 0.88;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.35);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
  border-color: rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.04);
}

/* Sections */
.section {
  padding: 6rem 2rem;
}

.section-container {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 680px;
  margin-bottom: 3rem;
}

/* Problem Section */
.problem-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.problem-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  transition: border-color 0.2s, transform 0.2s;
}

.problem-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-3px);
}

.problem-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.problem-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.problem-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Features */
.features-section {
  background: var(--bg-primary);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-3px);
}

.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--surface-glow);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.feature-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--accent-primary);
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* How It Works */
.how-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 680px;
}

.step {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.step-number {
  font-size: 2rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  min-width: 3rem;
  line-height: 1.2;
}

.step-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.step-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.step-connector {
  width: 2px;
  height: 2.5rem;
  background: linear-gradient(to bottom, var(--accent-primary), transparent);
  margin-left: 0.9rem;
}

/* Architecture Diagram */
.arch-section {
  background: var(--bg-primary);
}

.arch-diagram {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 2.5rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
}

.arch-row {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
}

.arch-label {
  min-width: 80px;
  font-weight: 700;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.arch-sources {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.arch-tag {
  padding: 0.25rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

.arch-arrow {
  text-align: center;
  color: var(--accent-primary);
  font-size: 1.25rem;
  padding: 0.25rem 0;
  margin-bottom: 0.5rem;
}

.arch-box {
  flex: 1;
  padding: 0.6rem 1rem;
  background: var(--surface);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: 8px;
  color: var(--text-secondary);
}

.arch-inbox .arch-box,
.arch-pipeline .arch-box {
  border-color: rgba(99, 102, 241, 0.4);
  color: var(--accent-primary);
}

.arch-layers {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.arch-layer {
  flex: 1;
}

.arch-layer-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.arch-layer-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.arch-entity {
  font-size: 0.7rem;
  color: var(--accent-secondary);
}

.arch-sync {
  font-size: 1.5rem;
  color: var(--accent-primary);
}

.arch-archive .arch-box {
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
}

/* Services */
.services-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}

.service-card:hover {
  border-color: rgba(99, 102, 241, 0.4);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.service-icon {
  width: 48px;
  height: 48px;
  background: var(--surface-glow);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}

.service-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent-primary);
}

.service-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.service-card > p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.service-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.service-list li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding-left: 1.25rem;
  position: relative;
}

.service-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-size: 0.75rem;
}

/* Open Source */
.opensource-section {
  background: var(--bg-primary);
}

.opensource-card {
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(34,211,238,0.08));
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 20px;
  padding: 3.5rem;
  text-align: center;
}

.opensource-card h2 {
  font-size: clamp(1.5rem, 3.5vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}

.opensource-card p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto 2rem;
}

.opensource-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* Contact */
.contact-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  text-align: center;
  transition: border-color 0.2s, transform 0.2s;
}

.contact-card:hover {
  border-color: rgba(99, 102, 241, 0.35);
  transform: translateY(-3px);
}

.contact-icon {
  width: 52px;
  height: 52px;
  background: var(--surface-glow);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent-primary);
}

.contact-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.contact-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.contact-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-cyan);
  transition: opacity 0.2s;
}

.contact-link:hover {
  opacity: 0.75;
}

/* Footer */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 4rem 2rem 2rem;
}

.footer-container {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 3rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.footer-brand {
  max-width: 280px;
}

.footer-logo {
  font-size: 1.1rem;
  font-weight: 800;
  display: block;
  margin-bottom: 0.75rem;
}

.footer-by {
  font-weight: 400;
  color: var(--text-muted);
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: 4rem;
  flex-wrap: wrap;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.footer-col a {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Section visibility — override JS inline opacity:0 */
.section {
  opacity: 1 !important;
  transform: none !important;
}

/* Karpathy Origins Section */
.karpathy-section {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.karpathy-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  margin-bottom: 2rem;
  overflow-x: auto;
}

.diagram-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.karpathy-diagram pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
  white-space: pre;
}

.diagram-caption {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.diagram-caption strong {
  color: var(--accent-cyan);
}

.karpathy-pros {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.karpathy-pro-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
}

.karpathy-pro-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.karpathy-pro-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.karpathy-pro-card li {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  padding-left: 1.25rem;
  position: relative;
}

.karpathy-pro-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
}

.karpathy-pro-card li strong {
  color: var(--text-primary);
}

/* Comparison Section */
.comparison-section {
  background: var(--bg-primary);
}

.comparison-table-wrapper {
  overflow-x: auto;
  margin-bottom: 2.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 1.25rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.comparison-table th {
  background: var(--surface);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table tbody tr:hover {
  background: rgba(255,255,255,0.02);
}

.comparison-table td:first-child {
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

.comparison-table td:nth-child(2) {
  color: var(--text-muted);
}

.comparison-table td:nth-child(3) {
  color: var(--text-primary);
}

.karpathy-label {
  color: var(--text-muted);
}

.memres-label {
  color: var(--accent-primary);
  font-weight: 700;
}

.comparison-diagram {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  overflow-x: auto;
}

.comparison-diagram pre {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  line-height: 1.45;
  color: var(--text-secondary);
  margin: 0;
  white-space: pre;
}

/* Architecture Grid */
.arch-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.arch-block {
  width: 100%;
  max-width: 680px;
  text-align: center;
}

.arch-block-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.arch-sources {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.arch-tag {
  padding: 0.25rem 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--accent-cyan);
}

.arch-arrow-down {
  color: var(--accent-primary);
  font-size: 1rem;
  padding: 0.25rem 0;
}

.arch-block .arch-box {
  padding: 0.6rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.inbox-block .arch-box,
.pipeline-block .arch-box {
  border-color: rgba(99, 102, 241, 0.25);
  color: var(--accent-primary);
}

.manifest-block .arch-box {
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--accent-emerald);
}

.arch-layers-row {
  width: 100%;
  max-width: 680px;
  display: flex;
  align-items: stretch;
  gap: 1rem;
}

.graph-block,
.wiki-block {
  flex: 1;
  text-align: left;
}

.graph-block .arch-block-label {
  color: var(--accent-primary);
}

.wiki-block .arch-block-label {
  color: var(--accent-cyan);
}

.arch-layer-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.5rem;
}

.arch-entity {
  font-size: 0.72rem;
  color: var(--accent-secondary);
  font-family: 'JetBrains Mono', monospace;
}

.arch-layer-caption {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-style: italic;
}

.arch-sync {
  font-size: 1.5rem;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  padding-top: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    padding: 1rem 1.25rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a:not(.nav-cta):not([href="#karpathy"]):not([href="#comparison"]) {
    display: none;
  }

  .hero {
    padding: 7rem 1.25rem 3rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .section {
    padding: 4rem 1.25rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn-primary, .btn-secondary {
    width: 100%;
    justify-content: center;
    max-width: 280px;
  }

  .karpathy-diagram {
    padding: 1.25rem;
  }

  .karpathy-diagram pre {
    font-size: 0.6rem;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 0.75rem;
    font-size: 0.8rem;
  }

  .comparison-diagram {
    padding: 1.25rem;
  }

  .comparison-diagram pre {
    font-size: 0.58rem;
  }

  .arch-layers-row {
    flex-direction: column;
  }

  .arch-sync {
    display: none;
  }

  .steps {
    max-width: 100%;
  }

  .opensource-card {
    padding: 2rem 1.5rem;
  }

  .opensource-actions {
    flex-direction: column;
    align-items: center;
  }

  .footer-container {
    flex-direction: column;
  }

  .footer-links {
    gap: 2rem;
  }
}