:root {
  --bg: #050510;
  --bg-2: #0a0a1a;
  --accent: #00f0ff;
  --accent-2: #a855f7;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: url('assets/phi-wave.svg') center/cover no-repeat;
  opacity: 0.4;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, transparent 0%, var(--bg) 80%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

.badge {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: rgba(0, 240, 255, 0.08);
  margin-bottom: 1rem;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  margin: 0 0 1rem;
  line-height: 1.1;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), #ff00aa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--muted);
  margin-bottom: 2rem;
}

.formula {
  font-family: 'Courier New', monospace;
  font-size: 1.1rem;
  color: var(--accent);
  background: rgba(0, 240, 255, 0.08);
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: inline-block;
  margin-bottom: 2rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.8rem;
  border-radius: 10px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  color: #000;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.25);
}

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

.section {
  padding: 5rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section-alt {
  background: var(--bg-2);
}

.section h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  text-align: center;
}

.section-intro {
  text-align: center;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 3rem;
}

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

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem;
  transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 240, 255, 0.3);
}

.card h3 {
  margin-top: 0;
  font-size: 1.5rem;
  color: var(--accent);
}

.price {
  font-size: 2rem;
  font-weight: 800;
  margin: 0.5rem 0;
}

.price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--muted);
}

.features {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.features li {
  padding: 0.4rem 0;
  color: var(--muted);
}

.features li::before {
  content: 'φ';
  color: var(--accent);
  margin-right: 0.6rem;
  font-weight: bold;
}

.btn-full {
  width: 100%;
  justify-content: center;
  margin-top: 1rem;
}

.how-it-works {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.step {
  padding: 1.5rem;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #000;
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

footer {
  text-align: center;
  padding: 3rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
}

footer strong {
  color: var(--text);
}

@media (max-width: 600px) {
  .hero {
    min-height: 80vh;
  }
  .cta-group {
    flex-direction: column;
    width: 100%;
  }
  .btn {
    width: 100%;
    justify-content: center;
  }
}