:root {
  --purple: #7c3aed;
  --azure: #0ea5e9;
  --dark: #020617;
  --light: #f1f5f9;
}

* {
  box-sizing: border-box;
  font-family: Inter, sans-serif;
}

body {
  margin: 0;
  background: var(--light);
  color: var(--dark);
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: white;
  display: flex;
  justify-content: space-between;
  padding: 1rem 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,.08);
  z-index: 1000;
}

.navbar a {
  margin-left: 1rem;
  text-decoration: none;
  font-weight: 600;
  color: var(--purple);
}

.hero {
  height: 100vh;
  background: linear-gradient(120deg, var(--purple), var(--azure));
  color: white;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.btn {
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  font-weight: bold;
}

.primary {
  background: white;
  color: var(--purple);
}

.secondary {
  background: var(--azure);
  color: white;
}

.danger {
  background: crimson;
  color: white;
}

section {
  padding: 6rem 2rem;
  text-align: center;
}

.features, .games {
  background: #eef2ff;
}

.feature-grid, .game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px,1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.card, .game-card {
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 15px 30px rgba(0,0,0,.1);
}

.auth input {
  display: block;
  width: 100%;
  max-width: 320px;
  margin: 0.6rem auto;
  padding: 0.7rem;
  border-radius: 8px;
  border: 1px solid #c7d2fe;
}

.hidden {
  display: none;
}

footer {
  background: var(--dark);
  color: white;
  padding: 1.5rem;
}