:root {
  --ark-bg: #f5f7fa;
  --ark-panel: #ffffff;
  --ark-border: #e5e7eb;
  --ark-text: #0f172a;
  --ark-muted: #6b7280;
  --ark-gradient: linear-gradient(135deg, #6A7BFF, #A855F7, #38BDF8);
  --ark-primary: #4f46e5;
  --ark-primary-hover: #4338ca;
}

* { box-sizing: border-box; }
body { 
  margin: 0; 
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; 
  background: var(--ark-bg); 
  color: var(--ark-text);
  -webkit-font-smoothing: antialiased;
}  
.container { width: min(1200px, 90%); margin: auto; }

header { padding: 24px 0; display: flex; justify-content: space-between; align-items: center; }
.brand-cluster { display: flex; align-items: center; gap: 40px; }
.logo { display: flex; align-items: center; gap: 12px; font-weight: 800; font-size: 20px; letter-spacing: -0.02em; text-decoration: none; color: inherit; }
.logo-img { height: 24px; width: auto; }
.sys-nav { display: flex; gap: 24px; }
.sys-nav a { font-size: 14px; font-weight: 600; color: var(--ark-muted); text-decoration: none; transition: color 0.2s ease; }
.sys-nav a:hover { color: var(--ark-text); }
.btn { 
  padding: 12px 20px; 
  border-radius: 8px; 
  background: var(--ark-primary); 
  color: white; 
  font-weight: 600; 
  box-shadow: 0 4px 12px rgba(79,70,229,0.15); 
  cursor: pointer; 
  transition: all 0.2s ease; 
  display: inline-block;
  text-decoration: none;
}

.btn:hover {
  background: var(--ark-primary-hover);
  box-shadow: 0 6px 16px rgba(79,70,229,0.22);
  transform: translateY(-1px);
}  

.hero { padding: 100px 0 80px; display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; position: relative; }

.hero:before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(106,123,255,0.06), transparent 40%),
              radial-gradient(circle at 80% 60%, rgba(56,189,248,0.06), transparent 40%);
  pointer-events: none;
}
h1 { font-size: 64px; line-height: 1.05; margin: 0; letter-spacing: -0.03em; font-weight: 800;} 
.gradient { background: var(--ark-gradient); -webkit-background-clip: text; color: transparent; }
.hero p { color: var(--ark-muted); font-size: 18px; max-width: 520px; line-height: 1.6; margin-top: 24px;} 
.hero .actions { margin-top: 32px; display: flex; gap: 16px; }

.btn.secondary {
  background: #ffffff;
  color: var(--ark-text);
  border: 1px solid var(--ark-border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

.btn.secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.section { padding: 80px 0; }
.label { font-size: 12px; letter-spacing: 0.1em; color: var(--ark-muted); margin-bottom: 12px; font-weight: 700; text-transform: uppercase; }
h2 { font-size: 40px; letter-spacing: -0.02em; font-weight: 800; margin-top: 0; margin-bottom: 48px; }

.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card { padding: 32px; border-radius: 12px; background: var(--ark-panel); border: 1px solid var(--ark-border); box-shadow: 0 4px 12px rgba(0,0,0,0.03); transition: transform 0.2s ease, box-shadow 0.2s ease;} 
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
.card h3 { margin-top: 0; font-size: 20px; letter-spacing: -0.01em; }
.card span { display: block; margin-top: 12px; color: var(--ark-muted); line-height: 1.5; }

.why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.why { padding: 32px; border: 1px solid var(--ark-border); border-radius: 12px; background: var(--ark-panel); box-shadow: 0 2px 8px rgba(0,0,0,0.02);}  
.why b { display: block; margin-bottom: 12px; font-size: 18px; letter-spacing: -0.01em; }
.why span { color: var(--ark-muted); line-height: 1.5; }

.case { border-left: 3px solid var(--ark-primary); padding-left: 20px; margin-bottom: 32px; }
.case small { color: var(--ark-muted); display: block; margin-bottom: 8px; font-weight: 700; letter-spacing: 0.05em; font-size: 11px; }
.case b { display: block; font-size: 20px; margin-bottom: 8px; letter-spacing: -0.01em; }
.case span { color: var(--ark-muted); line-height: 1.5; max-width: 600px; display: block; }

.legal-footer { display: flex; justify-content: space-between; align-items: center; padding: 40px 0; border-top: 1px solid var(--ark-border); margin-top: 60px; color: var(--ark-muted); font-size: 14px; font-weight: 500; text-align: left; }
.footer-left { line-height: 1.6; }
.footer-tagline { font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase; opacity: 0.8; }
.footer-right { display: flex; gap: 24px; }
.footer-right a { color: var(--ark-muted); text-decoration: none; transition: color 0.2s ease; }
.footer-right a:hover { color: var(--ark-text); }

/* LEGAL PAGES */
.legal-doc { padding: 60px 0; max-width: 800px; margin: 0 auto; }
.legal-doc h1 { font-size: 40px; margin-bottom: 40px; }
.legal-content h2 { font-size: 24px; margin-top: 40px; margin-bottom: 16px; font-weight: 700; border-bottom: 1px solid var(--ark-border); padding-bottom: 8px; }
.legal-content p { color: var(--ark-muted); line-height: 1.6; margin-bottom: 20px; font-size: 16px; }
.legal-content a { color: var(--ark-primary); text-decoration: none; }

@media(max-width: 900px){
  .hero, .grid, .why-grid { grid-template-columns: 1fr; }
  h1 { font-size: 48px; }
  .system-visual { margin-top: 40px; }
}

@media(max-width: 600px){
  header { flex-wrap: wrap; gap: 20px; }
  .brand-cluster { gap: 20px; flex-wrap: wrap; }
  .sys-nav { flex-wrap: wrap; gap: 16px; }
  .legal-footer { flex-direction: column; gap: 32px; align-items: flex-start; }
  .footer-right { flex-direction: column; align-items: flex-start; gap: 16px; }
}

/* HERO GRAPHIC - SYSTEM VISUAL */
.system-visual {
  position: relative;
  height: 420px;
  border-radius: 16px;
  border: 1px solid var(--ark-border);
  background:
    radial-gradient(circle at 18% 24%, rgba(106,123,255,0.08), transparent 28%),
    radial-gradient(circle at 82% 72%, rgba(56,189,248,0.08), transparent 30%),
    linear-gradient(180deg, #ffffff, #f8fafc);
  overflow: hidden;
  box-shadow: 0 12px 32px rgba(15,23,42,0.04);
}

.system-visual:before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(15,23,42,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15,23,42,0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(circle at center, black, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at center, black, transparent 80%);
  pointer-events: none;
}

.flow {
  position: absolute;
  border-radius: 50%;
  border: 1px dashed rgba(79,70,229,0.2);
  animation: drift 8s ease-in-out infinite alternate;
}

.f1 { width: 180px; height: 180px; top: 32px; left: 80px; }
.f2 { width: 220px; height: 220px; bottom: 24px; right: 64px; animation-delay: -2s; }

.node {
  position: absolute;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--ark-border);
  background: rgba(255,255,255,0.95);
  box-shadow: 0 8px 16px rgba(15,23,42,0.04);
  letter-spacing: 0.02em;
  line-height: 1.3;
  z-index: 2;
}

.node small {
  display: block;
  margin-top: 4px;
  color: var(--ark-muted);
  font-size: 10px;
  letter-spacing: 0.1em;
  font-weight: 500;
  text-transform: uppercase;
}

.core {
  top: 50%; left: 50%; transform: translate(-50%, -50%);
  background: var(--ark-gradient);
  color: white;
  border: none;
  font-weight: 800;
  padding: 14px 18px;
  animation: pulseCore 3s ease-in-out infinite;
  box-shadow: 0 12px 24px rgba(106,123,255,0.2);
}

.core small { color: rgba(255,255,255,0.8); }

.n1 { top: 50px; left: 50px; }
.n2 { top: 76px; right: 60px; }
.n3 { bottom: 60px; left: 96px; }
.n4 { bottom: 90px; right: 40px; }
.n5 { top: 190px; left: 24px; }

.line {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, transparent, #6A7BFF, #38BDF8, transparent);
  opacity: 0.5;
  transform-origin: left center;
  z-index: 1;
}

.line:after {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 32px;
  height: 6px;
  border-radius: 8px;
  background: linear-gradient(90deg, transparent, rgba(56,189,248,0.9));
  animation: signal 3s ease-in-out infinite;
}

.l1 { width: 200px; top: 100px; left: 130px; transform: rotate(26deg); }
.l2 { width: 170px; top: 125px; right: 135px; transform: rotate(148deg); }
.l3 { width: 205px; bottom: 125px; left: 170px; transform: rotate(-22deg); }
.l4 { width: 170px; bottom: 145px; right: 125px; transform: rotate(-152deg); }
.l5 { width: 150px; top: 220px; left: 115px; transform: rotate(-8deg); opacity: 0.3; }

.status-pill {
  position: absolute;
  top: 24px;
  right: 24px;
  z-index: 3;
  padding: 6px 12px;
  border-radius: 999px;
  background: #f0f9ff;
  border: 1px solid #bae6fd;
  color: #0369a1;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.status-pill:before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: #38bdf8;
  box-shadow: 0 0 0 4px rgba(56,189,248,0.15);
  vertical-align: middle;
}

@keyframes signal {
  0% { transform: translateX(0); opacity: 0; }
  20% { opacity: 1; }
  100% { transform: translateX(150px); opacity: 0; }
}

@keyframes pulseCore {
  0%, 100% { box-shadow: 0 12px 24px rgba(79,70,229,0.15); }
  50% { box-shadow: 0 16px 32px rgba(56,189,248,0.25); }
}

@keyframes drift {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-6px) scale(1.02); }
}