:root {
  --bg: #222222;
  --bg-soft: #2d2d2d;
  --text: #f5f7ff;
  --muted: #b7c0d8;
  --primary: #4b81f1;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

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

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.narrow {
  width: min(780px, 92vw);
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(34, 34, 34, 0.9);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(6px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--primary);
  color: white;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.02em;
}

.brand h1 {
  font-size: 18px;
  font-weight: 600;
}

.tagline {
  font-size: 13px;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
}

.nav a {
  color: var(--muted);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.nav a.active,
.nav a:hover {
  color: var(--text);
  border-bottom-color: var(--primary);
}

.hero {
  padding: 70px 0 50px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 36px;
  align-items: center;
}

.eyebrow {
  color: var(--primary);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.hero h2 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
  margin-bottom: 18px;
}

.hero p {
  color: var(--muted);
  margin-bottom: 20px;
  font-size: 16px;
}

.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  background: var(--primary);
  color: white;
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-outline {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.card h3 {
  font-size: 20px;
  margin-bottom: 16px;
}

.card ul {
  list-style: none;
  display: grid;
  gap: 10px;
}

.card li::before {
  content: "•";
  color: var(--primary);
  margin-right: 10px;
}

.features {
  padding: 30px 0 70px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 22px;
  border-radius: 14px;
}

.feature h4 {
  margin-bottom: 10px;
  font-size: 18px;
}

.feature p {
  color: var(--muted);
  font-size: 14px;
}

.page {
  padding: 50px 0 70px;
}

.page h2 {
  font-size: clamp(26px, 4vw, 36px);
  margin-bottom: 20px;
}

.page h3 {
  margin-top: 26px;
  margin-bottom: 10px;
  font-size: 20px;
}

.page p,
.page ul {
  color: var(--muted);
  margin-bottom: 14px;
}

.page ul {
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 900px) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav {
    flex-wrap: wrap;
  }

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

  .hero {
    padding-top: 50px;
  }

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

@media (max-width: 600px) {
  .site-header .container {
    padding: 16px 0;
  }

  .brand h1 {
    font-size: 16px;
  }

  .tagline {
    font-size: 12px;
  }

  .card {
    padding: 22px;
  }

  .hero h2 {
    font-size: 28px;
  }
}