* { margin: 0; box-sizing: border-box; }
body {
  font-family: system-ui;
  background: #0f172a;
  color: #e5e7eb;
}

.header {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: #020617;
  z-index: 100;
}

.nav a {
  margin-left: 1rem;
  color: #94a3b8;
  text-decoration: none;
}
.nav a.active { color: #38bdf8; }

.menu-btn { display: none; cursor: pointer; }

/* HERO */
.hero {
  height: 100vh;
  display: grid;
  place-items: center;
  position: relative;
  overflow: hidden;
}
.hero-layer.bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle, #38bdf8, transparent);
  animation: pulse 8s infinite;
}
.hero-content {
  position: relative;
  text-align: center;
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit,minmax(220px,1fr));
  gap: 1.5rem;
  padding: 3rem;
}

/* CARD */
.card {
  background: #020617;
  padding: 2rem;
  border-radius: 12px;
  transition: transform .4s;
}
.card:hover { transform: rotateY(10deg) scale(1.05); }

/* FORM */
.field {
  position: relative;
  margin: 2rem;
}
.field input {
  width: 100%;
  padding: 1rem;
  background: transparent;
  border: 1px solid #38bdf8;
  color: white;
}
.field label {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  transition: .3s;
}
.field input:focus + label,
.field input:valid + label {
  top: -8px;
  font-size: .8rem;
  color: #38bdf8;
}

/* TOAST */
#toast {
  position: fixed;
  bottom: 20px;
  right: -300px;
  background: #38bdf8;
  color: black;
  padding: 1rem 2rem;
  transition: .5s;
}
#toast.show { right: 20px; }

@keyframes pulse {
  0%,100% { opacity: .3 }
  50% { opacity: .7 }
}