:root {
  --bg: #050810;
  --panel: rgba(12, 22, 38, 0.85);
  --cyan: #22d3ee;
  --cyan-dim: rgba(34, 211, 238, 0.35);
  --text: #e8f4ff;
  --muted: #8aa4bd;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: radial-gradient(ellipse 120% 80% at 50% -20%, #0d2840 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.55;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--cyan-dim);
  backdrop-filter: blur(8px);
  background: rgba(5, 8, 16, 0.75);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.95rem;
}

.orb {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #fff 0%, var(--cyan) 35%, #0369a1 100%);
  box-shadow: 0 0 18px rgba(34, 211, 238, 0.55);
}

.nav {
  display: flex;
  gap: 1.25rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
}

.nav a:hover {
  color: var(--cyan);
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.hero h1 {
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 600;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 1.75rem;
}

.lead strong {
  color: var(--text);
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.25rem;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn.primary {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.25), rgba(6, 182, 212, 0.15));
  border-color: var(--cyan-dim);
  color: var(--cyan);
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.12);
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 28px rgba(34, 211, 238, 0.22);
}

.btn.ghost {
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--muted);
}

.btn.ghost:hover {
  border-color: var(--cyan-dim);
  color: var(--text);
}

.hint {
  font-size: 0.82rem;
  color: var(--muted);
}

.hint code {
  background: rgba(255, 255, 255, 0.06);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.grid {
  display: grid;
  gap: 1rem;
  margin-top: 2.75rem;
}

@media (min-width: 640px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  background: var(--panel);
  border: 1px solid rgba(34, 211, 238, 0.18);
  border-radius: 14px;
  padding: 1.15rem 1.25rem;
}

.card h2 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--cyan);
}

.card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.card code {
  font-size: 0.78rem;
  background: rgba(0, 0, 0, 0.35);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
}

.security {
  margin-top: 2.75rem;
  padding: 1.35rem 1.5rem;
  border-radius: 14px;
  border: 1px solid rgba(250, 204, 21, 0.25);
  background: rgba(250, 204, 21, 0.06);
}

.security h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.security ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.security li + li {
  margin-top: 0.35rem;
}

.foot {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}