:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --border: #222;
  --text: #e5e5e5;
  --text-muted: #888;
  --accent: #22c55e;
  --accent-dim: rgba(34, 197, 94, 0.1);
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Inter', -apple-system, sans-serif;
}

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

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* NAV */
nav {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}
nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
}
.logo span { color: var(--accent); }
nav .links {
  display: flex;
  gap: 32px;
  list-style: none;
}
nav .links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
nav .links a:hover { color: var(--text); }

/* HERO */
.hero {
  padding: 120px 0 100px;
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-family: var(--mono);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1.5px;
  max-width: 800px;
  margin-bottom: 24px;
}
.hero h1 .accent { color: var(--accent); }
.hero .subtitle {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.7;
}
.hero .stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
.stat-item {
  display: flex;
  flex-direction: column;
}
.stat-number {
  font-family: var(--mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 4px;
}

/* SYSTEM */
.system {
  padding: 100px 0;
  border-bottom: 1px solid var(--border);
}
.section-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.system h2 {
  font-family: var(--mono);
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.system .description {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 48px;
  line-height: 1.7;
}
.arch-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 48px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-muted);
  line-height: 2;
  overflow-x: auto;
  white-space: pre;
}
.arch-diagram .highlight { color: var(--accent); }
.arch-diagram .dim { color: #444; }

/* PROOF */
.proof {
  padding: 100px 0;
  border-bottom: 1px solid var(--border);
}
.proof h2 {
  font-family: var(--mono);
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 48px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  transition: border-color 0.2s;
}
.card:hover { border-color: #333; }
.card-tag {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 4px;
  display: inline-block;
  margin-bottom: 16px;
}
.card h3 {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
.card p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.7;
}
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}
.card-link:hover { opacity: 0.8; }

/* ABOUT */
.about {
  padding: 100px 0;
  border-bottom: 1px solid var(--border);
}
.about h2 {
  font-family: var(--mono);
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.about .bio {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  line-height: 1.8;
  margin-bottom: 24px;
}
.about .bio strong { color: var(--text); font-weight: 500; }
.about-link {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  text-decoration: none;
}
.about-link:hover { text-decoration: underline; }

/* CONTACT */
.contact {
  padding: 100px 0;
}
.contact h2 {
  font-family: var(--mono);
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 16px;
}
.contact .subtitle {
  font-size: 16px;
  color: var(--text-muted);
  margin-bottom: 40px;
}
.contact-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.contact-btn {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text);
  text-decoration: none;
  padding: 12px 24px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
}
.contact-btn:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}
.contact-btn.primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.contact-btn.primary:hover {
  opacity: 0.9;
}

/* FOOTER */
footer {
  padding: 24px 0;
  border-top: 1px solid var(--border);
}
footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer .copy {
  font-size: 13px;
  color: var(--text-muted);
}
footer .footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}
footer .footer-links a {
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
}
footer .footer-links a:hover { color: var(--text); }

/* PAGE (terms, privacy) */
.page-content {
  padding: 80px 0 100px;
}
.page-content .container {
  max-width: 760px;
}
.page-content h1 {
  font-family: var(--mono);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 40px;
}
.page-content h2 {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-top: 40px;
  margin-bottom: 16px;
}
.page-content p {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}
.page-content a {
  color: var(--accent);
  text-decoration: none;
}
.page-content a:hover { text-decoration: underline; }

nav .back {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
}
nav .back:hover { color: var(--text); }

/* MOBILE */
@media (max-width: 768px) {
  .hero { padding: 80px 0 60px; }
  .hero .stats { gap: 32px; }
  .system, .proof, .about, .contact { padding: 64px 0; }
  .arch-diagram { padding: 24px; font-size: 12px; }
  .cards { grid-template-columns: 1fr; }
  nav .links { gap: 20px; }
  .contact-links { flex-direction: column; }
  .contact-btn { text-align: center; }
}
@media (max-width: 480px) {
  nav .links { display: none; }
  .hero .stats { flex-direction: column; gap: 20px; }
}