:root {
  --bg-dark: #0b0f1a;
  --bg-darker: #070b14;
  --text-main: #ffffff;
  --text-muted: #b9c0d0;
  --accent-blue: #21c8ff;
  --accent-violet: #7b6cff;
  --border-soft: rgba(255,255,255,0.08);
}

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

body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.6;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 80px 20px;
}

.section.dark {
  background: var(--bg-darker);
}

.center {
  text-align: center;
}

.hero {
  background: radial-gradient(circle at top right, #1a2a4f, #070b14);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.hero h1 {
  font-size: 42px;
  margin-bottom: 20px;
}

.subtitle {
  color: var(--text-muted);
  margin-bottom: 30px;
  font-size: 18px;
}

.features li {
  margin-bottom: 10px;
}

.cta-group {
  margin-top: 30px;
}

.btn {
  display: inline-block;
  padding: 14px 26px;
  border-radius: 10px;
  text-decoration: none;
  margin-right: 15px;
  font-weight: bold;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-violet));
  color: #000;
}

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

.video-placeholder {
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.video-placeholder.large {
  height: 360px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(240px,1fr));
  gap: 20px;
  margin-top: 40px;
}

.card {
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  padding: 30px;
  background: rgba(255,255,255,0.02);
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.checklist li {
  margin-bottom: 12px;
}

.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-top: 40px;
}

.box {
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  padding: 30px;
}

.box.highlight {
  background: linear-gradient(
    135deg,
    rgba(33,200,255,0.1),
    rgba(123,108,255,0.1)
  );
}

.cta-box {
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: 50px 30px;
}

.faq details {
  border-bottom: 1px solid var(--border-soft);
  padding: 15px 0;
}

.faq summary {
  cursor: pointer;
  font-weight: bold;
}

@media (max-width: 900px) {
  .hero-grid,
  .split,
  .comparison {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 32px;
  }
}