:root {
  --bg: #0a0a0a;
  --bg-elevated: #111111;
  --bg-card: #161616;
  --fg: #f0f0f0;
  --fg-muted: #8a8a8a;
  --fg-dim: #555555;
  --accent: #00d47b;
  --accent-dim: #00a35f;
  --accent-glow: rgba(0, 212, 123, 0.15);
  --accent-glow-strong: rgba(0, 212, 123, 0.3);
  --border: #222222;
  --radius: 12px;
  --radius-sm: 8px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* NAV */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
}

.nav-logo {
  color: var(--accent);
  font-size: 22px;
}

.nav-links {
  display: flex;
  gap: 32px;
  color: var(--fg-muted);
  font-size: 14px;
  font-weight: 400;
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 32px 80px;
}

.hero-grid {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 24px;
  padding: 6px 16px;
  border: 1px solid var(--accent-dim);
  border-radius: 100px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 28px;
}

.hero-accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 460px;
  line-height: 1.7;
}

/* Hero molecule animation */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-molecule {
  position: relative;
  width: 380px;
  height: 380px;
}

.mol-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
}

.mol-ring-1 {
  width: 380px;
  height: 380px;
  top: 0;
  left: 0;
  border-color: var(--accent-glow);
  animation: spin 20s linear infinite;
}

.mol-ring-2 {
  width: 260px;
  height: 260px;
  top: 60px;
  left: 60px;
  border-color: var(--accent-glow-strong);
  animation: spin 15s linear infinite reverse;
}

.mol-ring-3 {
  width: 140px;
  height: 140px;
  top: 120px;
  left: 120px;
  border-color: var(--accent);
  animation: spin 10s linear infinite;
}

.mol-node {
  position: absolute;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 20px var(--accent-glow-strong);
}

.mol-node-1 { top: -5px; left: 185px; animation: pulse 3s ease-in-out infinite; }
.mol-node-2 { top: 185px; right: -5px; animation: pulse 3s ease-in-out infinite 0.6s; }
.mol-node-3 { bottom: -5px; left: 185px; animation: pulse 3s ease-in-out infinite 1.2s; }
.mol-node-4 { top: 120px; left: 55px; animation: pulse 3s ease-in-out infinite 1.8s; }
.mol-node-5 { top: 190px; left: 190px; background: var(--accent); width: 16px; height: 16px; margin: -3px; box-shadow: 0 0 40px var(--accent); }

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.7; }
  50% { transform: scale(1.8); opacity: 1; }
}

/* TRUST */
.trust {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 48px 32px;
  background: var(--bg-elevated);
}

.trust-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
}

.trust-item {
  text-align: center;
}

.trust-number {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}

.trust-label {
  font-size: 13px;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.trust-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* FEATURES */
.features {
  padding: 120px 32px;
}

.features-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.features-header {
  margin-bottom: 64px;
}

.features-header h2 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 16px;
}

.text-accent {
  color: var(--accent);
}

.features-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 500px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  transition: border-color 0.3s;
}

.feature-card:hover {
  border-color: var(--accent-dim);
}

.feature-card-large {
  grid-column: span 3;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 212, 123, 0.04) 100%);
  border-color: var(--accent-dim);
  padding: 48px;
}

.feature-icon {
  font-size: 28px;
  color: var(--accent);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.7;
}

.feature-card-large h3 {
  font-size: 26px;
}

.feature-card-large p {
  font-size: 17px;
  max-width: 700px;
}

/* EDUCATION */
.education {
  padding: 120px 32px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.education-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.education-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 3px;
  color: var(--accent);
  margin-bottom: 20px;
}

.education-content h2 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 20px;
}

.education-content p {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.8;
  margin-bottom: 28px;
}

.education-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topic-pill {
  display: inline-block;
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-muted);
  transition: all 0.3s;
}

.topic-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.education-preview {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.3s;
}

.edu-card:hover {
  border-color: var(--accent-dim);
}

.edu-card-tag {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 12px;
}

.edu-card h4 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.3;
}

.edu-card p {
  font-size: 14px;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* CLOSING */
.closing {
  padding: 140px 32px;
  text-align: center;
}

.closing-inner {
  max-width: 800px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.closing-sub {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto;
}

/* FOOTER */
.footer {
  padding: 48px 32px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
}

.footer-links {
  display: flex;
  gap: 12px;
  font-size: 13px;
  color: var(--fg-muted);
}

.footer-legal {
  max-width: 600px;
  text-align: center;
}

.footer-legal p {
  font-size: 11px;
  color: var(--fg-dim);
  line-height: 1.6;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 60px;
    text-align: center;
  }

  .hero-sub {
    margin: 0 auto;
  }

  .hero-molecule {
    width: 280px;
    height: 280px;
  }

  .mol-ring-1 { width: 280px; height: 280px; }
  .mol-ring-2 { width: 190px; height: 190px; top: 45px; left: 45px; }
  .mol-ring-3 { width: 100px; height: 100px; top: 90px; left: 90px; }
  .mol-node-1 { left: 135px; }
  .mol-node-2 { top: 135px; }
  .mol-node-3 { left: 135px; }
  .mol-node-4 { top: 90px; left: 40px; }
  .mol-node-5 { top: 140px; left: 140px; }

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

  .feature-card-large {
    grid-column: span 1;
  }

  .education-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .trust-inner {
    flex-wrap: wrap;
    gap: 24px;
  }

  .trust-divider {
    display: none;
  }

  .trust-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .nav-links {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero { padding: 100px 20px 60px; }
  .features { padding: 80px 20px; }
  .education { padding: 80px 20px; }
  .closing { padding: 80px 20px; }
  .trust { padding: 32px 20px; }
  .feature-card { padding: 24px; }
  .feature-card-large { padding: 32px; }
}