:root {
  color-scheme: light dark;
  --bg: #0b1220;
  --fg: #e8eef7;
  --muted: #9aa8bc;
  --accent: #3b82f6;
  --border: rgba(255, 255, 255, 0.08);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, #1e3a5f 0%, var(--bg) 50%);
  color: var(--fg);
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
}
.logo { font-weight: 600; letter-spacing: -0.02em; }
.site-header nav { display: flex; gap: 1rem; align-items: center; }
.btn-primary, .btn-ghost {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--fg); }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.hero {
  max-width: 40rem;
  margin: 0 auto;
  padding: 4rem 2rem 3rem;
  text-align: center;
}
.eyebrow {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 0 0 1rem;
}
.hero h1 { font-size: 2.25rem; margin: 0 0 1rem; letter-spacing: -0.03em; }
.lead { color: var(--muted); line-height: 1.6; margin: 0 0 2rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1.5rem;
  max-width: 56rem;
  margin: 0 auto;
  padding: 2rem;
}
.features article {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
}
.features h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.features p { margin: 0; font-size: 0.875rem; color: var(--muted); line-height: 1.5; }
.site-footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  font-size: 0.8rem;
}
.page-main { max-width: 72rem; margin: 0 auto; padding: 2rem; }
.page-main h1 { margin: 0 0 0.5rem; }
.page-intro { color: var(--muted); margin: 0 0 2rem; }
.plans-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}
.plan-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.plan-card h2 { margin: 0; font-size: 1.125rem; }
.plan-price { font-size: 1.5rem; font-weight: 600; }
.plan-price span { font-size: 0.875rem; font-weight: 400; color: var(--muted); }
.plan-card ul { margin: 0; padding-left: 1.1rem; font-size: 0.8rem; color: var(--muted); line-height: 1.6; }
.checkout-panel {
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 12px;
}
.checkout-panel h2 { margin: 0 0 1rem; font-size: 1.125rem; }
.checkout-panel label { display: block; font-size: 0.8rem; margin-bottom: 0.25rem; color: var(--muted); }
.checkout-panel input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  margin-bottom: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.2);
  color: var(--fg);
  font-size: 0.9rem;
}
.checkout-panel .error {
  color: #f87171;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
}
.hidden { display: none; }