:root {
  --accent: #2f7df0;
  --accent-dark: #1a52c4;
  --bg: #f5f8ff;
  --text: #14161a;
  --muted: #5b6470;
}

* { box-sizing: border-box; }

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

.nav {
  position: sticky;
  top: 0;
  background: rgba(245, 248, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  z-index: 10;
}

.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

.brand {
  font-weight: 700;
  font-size: 17px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.nav nav a {
  margin-left: 22px;
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

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

.hero {
  text-align: center;
  padding: 90px 24px 60px;
  max-width: 720px;
  margin: 0 auto;
}

.orbit {
  position: relative;
  width: 220px;
  height: 160px;
  margin: 0 auto 24px;
}

.core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 70px;
  height: 70px;
  margin: -35px 0 0 -35px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: 0 10px 30px rgba(47, 125, 240, 0.35);
}

.node {
  position: absolute;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  opacity: 0.85;
}

.n1 { background: #c9a3ff; top: 0; left: 50%; margin-left: -23px; }
.n2 { background: #ffb23e; top: 30%; right: 0; }
.n3 { background: #7ce0c6; bottom: 10%; right: 8%; }
.n4 { background: #ffe066; bottom: 10%; left: 8%; }
.n5 { background: #5fd0ff; top: 30%; left: 0; }

.hero h1 {
  font-size: 36px;
  font-weight: 800;
  margin: 0 0 14px;
}

.subtitle {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.5;
  margin: 0 0 32px;
}

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

.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: transform 0.15s ease;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  box-shadow: 0 8px 20px rgba(47, 125, 240, 0.3);
}

.btn-secondary {
  background: white;
  color: var(--text);
  border: 1px solid rgba(0,0,0,0.1);
}

.features {
  max-width: 1080px;
  margin: 40px auto 80px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}

.feature-card {
  background: white;
  border-radius: 18px;
  padding: 26px;
  border: 1px solid rgba(0,0,0,0.05);
  box-shadow: 0 4px 18px rgba(20, 22, 26, 0.04);
}

.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: white;
  margin-bottom: 14px;
}

.feature-card h3 {
  font-size: 16px;
  margin: 0 0 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

.versions {
  max-width: 720px;
  margin: 0 auto 90px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.version-card {
  background: white;
  border-radius: 18px;
  padding: 28px;
  text-align: center;
  border: 1px solid rgba(0,0,0,0.05);
  box-shadow: 0 4px 18px rgba(20, 22, 26, 0.04);
}

.version-card h3 { margin: 0 0 6px; }
.version-card p { color: var(--muted); margin: 0 0 18px; font-size: 14px; }

footer {
  text-align: center;
  padding: 30px 24px 50px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.7;
}

footer a {
  color: var(--muted);
  text-decoration: underline;
}

.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 90px;
}

.legal h1 {
  font-size: 28px;
  margin-bottom: 6px;
}

.legal .updated {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 36px;
}

.legal section {
  margin-bottom: 26px;
}

.legal h2 {
  font-size: 17px;
  margin: 0 0 8px;
}

.legal p {
  color: var(--muted);
  line-height: 1.65;
  margin: 0;
  font-size: 15px;
}