:root {
  --bg: #f7fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --accent: #00bcd4;
  --accent-dark: #0891b2;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(2, 8, 23, 0.07);
}

* { box-sizing: border-box; }

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

.container {
  width: min(1100px, 92%);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e2e8f0;
}

.header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.section { padding: 3.5rem 0; }
.hero h1 { font-size: clamp(1.8rem, 6vw, 3rem); line-height: 1.1; margin-bottom: .8rem; }
.hero p { color: var(--muted); max-width: 60ch; }

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  gap: 1rem;
}

.two-col { grid-template-columns: 1fr; }
.three-col { grid-template-columns: 1fr; }

ul { padding-left: 1rem; }

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 1.2rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  background: var(--accent);
  color: #00131a;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  transition: 160ms ease;
}

.btn:hover,
.btn:focus-visible {
  background: var(--accent-dark);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: #cbd5e1;
}

.site-footer {
  padding: 2rem 0;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (min-width: 768px) {
  .section { padding: 5rem 0; }
  .two-col { grid-template-columns: repeat(2, 1fr); }
  .three-col { grid-template-columns: repeat(3, 1fr); }
  .card { padding: 1.6rem; }
}