:root {
  --bg: #0b0f1a;
  --card: #161b2e;
  --accent: #4f7cff;
  --accent2: #00e0ff;
  --text: #e8ebf3;
  --muted: #9aa3c7;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Inter, system-ui, sans-serif;
}

body {
  background:
    radial-gradient(800px 400px at 10% -10%, #1a245a55, transparent),
    var(--bg);
  color: var(--text);
  overflow-x: hidden;
  padding-top: 60px; /* spazio per navbar fissa */
}

header {
  padding: 80px 20px;
  text-align: center;
}

header h1 {
  font-size: 3rem;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

header p {
  max-width: 720px;
  margin: 20px auto;
  color: var(--muted);
  font-size: 1.1rem;
}

section {
  max-width: 1100px;
  margin: auto;
  padding: 80px 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background: var(--card);
  padding: 24px;
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  transition: transform .3s ease, box-shadow .3s ease;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 45px rgba(0,0,0,0.6);
}

.card::after {
  content: "";
  position: absolute;
  inset: -50%;
  background: radial-gradient(circle, var(--accent2), transparent 70%);
  opacity: 0;
  transition: opacity .3s;
}

.card:hover::after {
  opacity: .15;
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--muted);
  font-size: .95rem;
}

.cta {
  display: inline-block;
  margin-top: 18px;
  padding: 12px 22px;
  border-radius: 12px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #000;
  font-weight: 600;
  text-decoration: none;
  position: relative; /* sopra il glow */
  z-index: 2;
}

footer {
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  border-top: 1px solid #ffffff10;
  font-size: 0.9rem;
  background: var(--card);
}

footer a {
  color: var(--accent2);
  text-decoration: none;
  margin: 0 8px;
  transition: color 0.2s;
}

footer a:hover {
  color: var(--accent);
}

.glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  pointer-events: none;
  background: radial-gradient(circle, #4f7cff55, transparent 70%);
  transform: translate(-50%, -50%);
  transition: transform .3s ease-out;
  z-index: -1;
}
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: #12182add;
  display: flex;
  justify-content: center;
  gap: 30px;
  padding: 12px 0;
  z-index: 1000;
  backdrop-filter: blur(6px);
}

.top-nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(18,24,42,0.95);
  backdrop-filter: blur(8px);
  z-index: 1000;
  padding: 10px 20px;
}

.top-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 40px;
}

.top-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}

.top-nav a:hover {
  color: var(--accent2);
}