/* ──────────────────────────────────────────
   steadfaste website stylesheet
   Elegant dark theme with gold/teal accents
────────────────────────────────────────── */

:root {
  --bg-deep:       #0a0f14;
  --bg-surface:    #0f1419;
  --bg-elevated:   #151c24;
  --bg-card:       #1a2330;
  --border-subtle: rgba(255,255,255,0.06);
  --border-medium: rgba(255,255,255,0.1);

  --text-primary:   #e8ecf1;
  --text-secondary: #8a95a5;
  --text-muted:     #4a5568;

  --accent-gold:    #c8a45c;
  --accent-gold-dim: rgba(200,164,92,0.15);
  --accent-teal:    #5ec8a8;
  --accent-teal-dim: rgba(94,200,168,0.15);
  --accent-rose:    #c85e7a;

  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', monospace;

  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ─── Canvas Background ─── */
#particleCanvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

/* ─── Navigation ─── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 100px;
  background: rgba(10,15,20,0.8);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.brand-icon {
  width: 28px; height: 28px;
  color: var(--accent-gold);
}

.brand-name {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-logo {
  height: 80px;
  width: auto;
  display: block;
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--accent-gold);
  transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.github-link svg {
  width: 20px; height: 20px;
  color: var(--text-secondary);
  transition: var(--transition);
}

.github-link:hover svg {
  color: var(--text-primary);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-gold);
  color: var(--bg-deep);
}

.btn-primary:hover {
  background: #d4b368;
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(200,164,92,0.25);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  border-color: var(--accent-gold);
}

.btn-lg {
  padding: 0.85rem 2rem;
  font-size: 1rem;
}

/* ─── Hero ─── */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 4rem;
  padding: 8rem 4rem 4rem;
  max-width: 1400px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 0.8rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--accent-gold-dim);
  color: var(--accent-gold);
  border: 1px solid rgba(200,164,92,0.2);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-title .line {
  display: block;
}

.hero-title .line:last-child {
  background: linear-gradient(135deg, var(--accent-gold) 0%, var(--accent-teal) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

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

/* ─── Hero Visual / Constellation ─── */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.constellation-demo {
  position: relative;
  width: 480px; height: 480px;
}

.constellation-demo .node {
  position: absolute;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent-teal);
  box-shadow: 0 0 12px rgba(94,200,168,0.4);
  transition: var(--transition);
}

.constellation-demo .node.center {
  width: 48px; height: 48px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: var(--accent-gold);
  box-shadow: 0 0 30px rgba(200,164,92,0.5);
}

.node-glow {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px solid rgba(200,164,92,0.3);
  animation: pulseGlow 3s ease-in-out infinite;
}

@keyframes pulseGlow {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.15); opacity: 0.2; }
}

@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 0.85; }
  50% { transform: scale(1.25); opacity: 1; }
}

.constellation-demo .worker {
  animation: breathe 4s ease-in-out infinite;
}
.constellation-demo .worker:nth-child(2) { animation-delay: 0s; }
.constellation-demo .worker:nth-child(3) { animation-delay: 0.7s; }
.constellation-demo .worker:nth-child(4) { animation-delay: 1.4s; }
.constellation-demo .worker:nth-child(5) { animation-delay: 2.1s; }
.constellation-demo .worker:nth-child(6) { animation-delay: 2.8s; }
.constellation-demo .worker:nth-child(7) { animation-delay: 3.5s; }

/* ─── Hero data-flow canvas overlay ─── */
.constellation-demo canvas.data-flow {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 10;
}

.constellation-demo .worker::after {
  content: attr(data-label);
  position: absolute;
  top: 24px; left: 50%;
  transform: translateX(-50%);
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
  font-family: var(--font-mono);
}

.w1 { top: 15%; left: 22%; }
.w2 { top: 15%; left: 68%; }
.w3 { top: 42%; left: 10%; }
.w4 { top: 42%; left: 80%; }
.w5 { top: 72%; left: 22%; }
.w6 { top: 72%; left: 68%; }

.connections {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

.connections line {
  stroke: var(--accent-teal);
  stroke-width: 1;
  opacity: 0.2;
  stroke-dasharray: 4 4;
  animation: dashFlow 20s linear infinite;
}

@keyframes dashFlow {
  to { stroke-dashoffset: -80; }
}

/* ─── Trust Banner ─── */
.trust-banner {
  position: relative;
  z-index: 1;
  padding: 6rem 2rem;
  background: linear-gradient(180deg, transparent 0%, var(--bg-surface) 50%, transparent 100%);
  text-align: center;
}

.trust-content blockquote {
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 300;
  font-style: italic;
  color: var(--text-primary);
  max-width: 700px;
  margin: 0 auto 1rem;
  line-height: 1.5;
}

.trust-content blockquote::before {
  content: '"';
  color: var(--accent-gold);
  font-size: 1.5em;
  margin-right: 0.1em;
}

.trust-content blockquote::after {
  content: '"';
  color: var(--accent-gold);
  font-size: 1.5em;
  margin-left: 0.1em;
}

.trust-caption {
  color: var(--text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

/* ─── Sections Common ─── */
section {
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 4rem;
  padding: 0 1.5rem;
}

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* ─── Features ─── */
.features {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-gold), var(--accent-teal));
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-medium);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-icon {
  width: 44px; height: 44px;
  color: var(--accent-gold);
  margin-bottom: 1.2rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.feature-card code {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg-elevated);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--accent-teal);
}

/* ─── Layers ─── */
.layers {
  padding: 6rem 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.layer-stack {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.layer {
  display: flex;
  gap: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2.5rem;
  transition: var(--transition);
  position: relative;
}

.layer:hover {
  border-color: var(--border-medium);
}

.layer-number {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent-gold);
  opacity: 0.7;
  flex-shrink: 0;
  padding-top: 0.2rem;
}

.layer-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.layer-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* ─── Status ─── */
.status {
  padding: 6rem 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.status-grid {
  display: grid;
  gap: 1.2rem;
  margin-bottom: 3rem;
}

.status-item {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  transition: var(--transition);
}

.status-item:hover {
  border-color: var(--border-medium);
}

.status-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
  position: relative;
}

.status-item.completed .status-dot {
  background: var(--accent-teal);
  box-shadow: 0 0 8px rgba(94,200,168,0.5);
}

.status-item.in-progress .status-dot {
  background: var(--accent-gold);
  animation: pulse 2s ease-in-out infinite;
}

.status-item.pending .status-dot {
  background: var(--text-muted);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.status-info h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.status-info p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.status-cta {
  text-align: center;
}

/* ─── CTA Section ─── */
.cta-section {
  padding: 8rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, transparent, var(--bg-surface) 30%, var(--bg-surface) 70%, transparent);
}

.cta-content {
  max-width: 600px;
  margin: 0 auto;
}

.cta-content h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 2.5rem;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ─── Footer ─── */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 2rem 2rem;
  background: var(--bg-deep);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.5rem;
  max-width: 280px;
}

.footer-contact {
  margin-top: 1rem;
}

.footer-contact a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  padding: 0.3rem 0;
  transition: var(--transition);
}

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

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* ─── Scroll Animations ─── */
[data-animate] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate].visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Page Header (shared) ─── */
.page-header {
  padding: 10rem 2rem 4rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.page-header h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.6;
}

/* ─── Content Section ─── */
.content-section {
  padding: 2rem 2rem 6rem;
  max-width: 850px;
  margin: 0 auto;
}

.content-block {
  margin-bottom: 3.5rem;
}

.content-block h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-subtle);
}

.content-block h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.8rem 0 0.8rem;
  color: var(--accent-gold);
}

.content-block p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.content-block ul,
.content-block ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

.content-block li {
  margin-bottom: 0.4rem;
  line-height: 1.6;
}

.content-block a {
  color: var(--accent-teal);
  text-decoration: none;
}

.content-block a:hover {
  text-decoration: underline;
}

.content-block code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-elevated);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  color: var(--accent-teal);
}

.content-block pre {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1rem 0 1.5rem;
}

.content-block pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ─── Install Page Specifics ─── */
.prerequisites {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.prereq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.2rem;
  text-align: center;
}

.prereq-card .prereq-name {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.prereq-card .prereq-desc {
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.step {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.step-number {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--accent-gold-dim);
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.step-content h3 {
  margin-top: 0;
  color: var(--text-primary);
  font-size: 1.1rem;
}

.update-section {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  margin-top: 2rem;
}

/* ─── Docs Page Specifics ─── */
.docs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 1.8rem;
  transition: var(--transition);
  text-decoration: none;
  color: inherit;
  display: block;
}

.doc-card:hover {
  border-color: var(--border-medium);
  box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}

.doc-card h3 {
  color: var(--accent-gold);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  margin-top: 0;
}

.doc-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
}

.doc-card .doc-tag {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-teal);
}

/* ─── Architecture Diagram ─── */
.arch-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  padding: 2rem;
  margin: 2rem 0;
  overflow-x: auto;
}

.arch-diagram pre {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-secondary);
  margin: 0;
  background: none;
  border: none;
  padding: 0;
}

.arch-diagram .box-label {
  color: var(--accent-gold);
}

.arch-diagram .wire-label {
  color: var(--accent-teal);
}

/* ─── System Diagram (CSS boxes) ─── */
.sys-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  margin: 2rem 0;
}
.sys-diagram .sys-layer { width: 100%; display: flex; justify-content: center; }
.sys-diagram .sys-box {
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem 1.5rem;
  text-align: center;
  min-width: 280px;
}
.sys-diagram .sys-box.accent { border-color: rgba(200,164,92,0.3); }
.sys-diagram .sys-box h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
  color: var(--accent-gold);
}
.sys-diagram .sys-box.accent h4 { color: var(--accent-teal); }
.sys-diagram .sys-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}
.sys-diagram .sys-items span {
  font-size: 0.72rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-deep);
  border-radius: 4px;
  color: var(--text-secondary);
}
.sys-diagram .wire-box { min-width: 220px; padding: 0.8rem 1.2rem; }
.sys-diagram .wire-box h4 { color: var(--accent-teal); }
.sys-diagram .sys-caption {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
}
.sys-diagram .sys-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}
.sys-diagram .sys-pill {
  font-size: 0.75rem;
  padding: 0.35rem 0.8rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 100px;
  color: var(--text-secondary);
}
.sys-diagram .sys-pill.alt {
  background: rgba(94,200,168,0.08);
  border-color: rgba(94,200,168,0.2);
  color: var(--accent-teal);
}
.sys-diagram .sys-arrow.down {
  width: 2px; height: 18px;
  background: linear-gradient(to bottom, var(--border-medium), transparent);
}
.sys-diagram .sys-arrow.up {
  width: 2px; height: 18px;
  background: linear-gradient(to top, var(--border-medium), transparent);
}

/* ─── Flow Diagram ─── */
.flow-diagram {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 2rem 0;
}
.flow-step {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
}
.flow-step:nth-child(odd) { border-left: 3px solid var(--accent-gold); }
.flow-step:nth-child(even) { border-left: 3px solid var(--accent-teal); }
.flow-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--bg-elevated);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700;
  color: var(--accent-gold);
  flex-shrink: 0;
}
.flow-body h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.25rem; }
.flow-body p { font-size: 0.85rem; color: var(--text-secondary); margin: 0; }
.flow-connector {
  width: 2px; height: 24px;
  background: var(--border-medium);
  margin-left: 2.1rem;
}

/* ─── Compare Diagram ─── */
.compare-diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: start;
  margin: 2rem 0;
}
.compare-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.compare-stack {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
}
.compare-box {
  font-size: 0.8rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  text-align: center;
  min-width: 180px;
}
.compare-box.agent { background: rgba(94,200,168,0.1); border: 1px solid rgba(94,200,168,0.25); color: var(--accent-teal); }
.compare-box.infra { background: var(--bg-elevated); border: 1px solid var(--border-subtle); color: var(--text-secondary); }
.compare-box.sf { background: rgba(200,164,92,0.12); border: 1px solid rgba(200,164,92,0.3); color: var(--accent-gold); font-weight: 600; }
.compare-arrow.right { width: 100%; height: 2px; background: var(--border-medium); position: relative; }
.compare-arrow.right::after {
  content: ''; position: absolute; right: -4px; top: -3px;
  border: 4px solid transparent; border-left-color: var(--border-medium);
}
.compare-note { font-size: 0.8rem; color: var(--text-secondary); text-align: center; margin-top: 0.5rem; line-height: 1.5; }
.compare-vs {
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; color: var(--accent-gold);
  padding-top: 2rem;
}

/* ─── Adoption Diagram ─── */
.adopt-diagram {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
}
.adopt-row {
  display: flex; align-items: center; gap: 1rem;
}
.adopt-label {
  width: 120px; flex-shrink: 0;
  font-size: 0.75rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted);
}
.adopt-pills {
  display: flex; flex-wrap: wrap; gap: 0.4rem;
  flex: 1;
}
.adopt-pills span {
  font-size: 0.75rem;
  padding: 0.3rem 0.7rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  color: var(--text-secondary);
}
.adopt-pills.sf span { background: rgba(200,164,92,0.08); border-color: rgba(200,164,92,0.2); color: var(--accent-gold); }
.adopt-pills.result span { background: rgba(94,200,168,0.08); border-color: rgba(94,200,168,0.2); color: var(--accent-teal); }
.adopt-arrow {
  text-align: center; font-size: 1.2rem; font-weight: 700;
  color: var(--text-muted); padding: 0.2rem 0;
}

/* ─── Doc Tabs ─── */
.doc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}
.doc-tab {
  padding: 0.5rem 1.2rem;
  border-radius: 100px;
  border: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.doc-tab:hover {
  border-color: var(--accent-gold);
  color: var(--text-primary);
}
.doc-tab.active {
  background: var(--accent-gold-dim);
  border-color: rgba(200,164,92,0.25);
  color: var(--accent-gold);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.section-lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 600px;
}

.doc-meta {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-teal);
  margin-bottom: 0.4rem;
}

.download-block {
  text-align: center;
  padding: 3rem 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
}
.download-block h2 { margin-bottom: 0.75rem; }
.download-block > p { color: var(--text-secondary); margin-bottom: 1.5rem; }
.download-note {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
    padding-top: 7rem;
  }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-cta { justify-content: center; }
  .hero-visual { order: -1; }
  .constellation-demo { transform: scale(0.7); }

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

  .nav-links {
    position: fixed;
    top: 100px; right: 0;
    flex-direction: column;
    background: var(--bg-deep);
    border-left: 1px solid var(--border-subtle);
    padding: 1.5rem;
    gap: 1.2rem;
    min-width: 200px;
    transform: translateX(100%);
    transition: var(--transition);
    height: calc(100vh - 100px);
    align-items: flex-start;
  }
  .nav-links.open { transform: translateX(0); }
  .mobile-toggle { display: flex; }
}

@media (max-width: 600px) {
  .hero { padding: 7rem 1.5rem 3rem; }
  .features, .layers, .status, .content-section { padding-left: 1.5rem; padding-right: 1.5rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .layer { flex-direction: column; gap: 1rem; padding: 1.8rem; }
  .step { flex-direction: column; gap: 0.8rem; }
  .cta-buttons { flex-direction: column; align-items: center; }
  .btn-lg { width: 100%; max-width: 300px; }

  .compare-diagram { grid-template-columns: 1fr; }
  .compare-vs { display: none; }
  .adopt-row { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .adopt-label { width: auto; }
  .sys-diagram .sys-box { min-width: auto; width: 100%; }
}