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

:root {
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --bg: #fafafa;
  --text: #1e293b;
  --text-light: #64748b;
  --card-bg: #fff;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

/* Nav */
header { background: #fff; border-bottom: 1px solid #e2e8f0; position: sticky; top: 0; z-index: 100; }
nav { max-width: 1100px; margin: 0 auto; padding: 16px 24px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); text-decoration: none; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { text-decoration: none; color: var(--text-light); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); }

/* Buttons */
.btn { display: inline-block; padding: 10px 24px; background: var(--primary); color: #fff; text-decoration: none; border-radius: 8px; font-weight: 600; transition: background 0.2s; }
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 8px 18px; font-size: 0.9rem; }
.btn-lg { padding: 14px 36px; font-size: 1.1rem; }

/* Hero */
.hero { text-align: center; padding: 80px 24px 60px; max-width: 800px; margin: 0 auto; }
.hero h1 { font-size: 3rem; line-height: 1.2; margin-bottom: 20px; }
.highlight { color: var(--primary); }
.subtitle { font-size: 1.2rem; color: var(--text-light); margin-bottom: 32px; max-width: 600px; margin-left: auto; margin-right: auto; }
.hero-actions { margin-bottom: 48px; }
.hero-stats { display: flex; justify-content: center; gap: 48px; }
.stat { display: flex; flex-direction: column; }
.stat strong { font-size: 1.8rem; color: var(--primary); }
.stat span { font-size: 0.85rem; color: var(--text-light); }

/* Sections */
section { padding: 80px 24px; }
section h2 { text-align: center; font-size: 2rem; margin-bottom: 12px; }
.section-subtitle { text-align: center; color: var(--text-light); margin-bottom: 40px; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; max-width: 1000px; margin: 40px auto 0; }
.feature-card { background: var(--card-bg); padding: 32px; border-radius: var(--radius); border: 1px solid #e2e8f0; }
.feature-card h3 { margin-bottom: 8px; font-size: 1.15rem; }
.feature-card p { color: var(--text-light); font-size: 0.95rem; }

/* Platforms */
.platforms { background: #fff; }
.platform-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 20px; max-width: 900px; margin: 0 auto; }
.platform-card { text-align: center; padding: 28px 16px; border-radius: var(--radius); border: 2px solid #e2e8f0; transition: border-color 0.2s; }
.platform-card.active { border-color: var(--primary); background: #eef2ff; }
.platform-icon { font-size: 2rem; font-weight: 800; color: var(--primary); margin-bottom: 8px; }
.platform-card h3 { font-size: 1rem; }
.platform-card p { font-size: 0.8rem; color: var(--text-light); }

/* How it works */
.steps { display: flex; gap: 32px; max-width: 900px; margin: 40px auto 0; }
.step { flex: 1; text-align: center; }
.step-num { width: 48px; height: 48px; line-height: 48px; border-radius: 50%; background: var(--primary); color: #fff; font-weight: 700; font-size: 1.2rem; margin: 0 auto 16px; }
.step h3 { margin-bottom: 8px; }
.step p { color: var(--text-light); font-size: 0.95rem; }

/* CTA */
.cta { text-align: center; background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%); color: #fff; border-radius: 0; }
.cta h2 { color: #fff; }
.cta p { color: rgba(255,255,255,0.85); margin-bottom: 24px; }
.cta .btn { background: #fff; color: var(--primary); }
.cta .btn:hover { background: #e0e7ff; }
.cta-note { font-size: 0.85rem; margin-top: 12px; color: rgba(255,255,255,0.7); }

/* Footer */
footer { padding: 40px 24px 20px; background: #1e293b; color: #94a3b8; }
.footer-inner { max-width: 1000px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.footer-brand strong { color: #fff; font-size: 1.1rem; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: #94a3b8; text-decoration: none; }
.footer-links a:hover { color: #fff; }
.copyright { text-align: center; font-size: 0.8rem; border-top: 1px solid #334155; padding-top: 16px; }

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 24px; }
  .steps { flex-direction: column; }
  .nav-links { gap: 12px; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
}