:root {
  --bg: #07070f;
  --surface: #10101d;
  --border: #23233a;
  --text: #f4f4fb;
  --text-dim: #8a8aa3;
  --neon-pink: #ff2ba6;
  --neon-purple: #8b5cf6;
  --neon-cyan: #22d3ee;
}

* {
  box-sizing: border-box;
}

body {
  background: radial-gradient(circle at 50% -10%, #16162c 0%, var(--bg) 55%);
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  margin: 0;
  min-height: 100vh;
}

.btn {
  background: transparent;
  border: 1px solid var(--neon-cyan);
  border-radius: 8px;
  color: var(--neon-cyan);
  cursor: pointer;
  font: inherit;
  letter-spacing: 0.08em;
  padding: 0.6rem 1.2rem;
  text-transform: uppercase;
  transition: box-shadow 0.15s ease, background 0.15s ease;
}

.btn:hover {
  background: rgba(34, 211, 238, 0.12);
  box-shadow: 0 0 14px rgba(34, 211, 238, 0.45);
}