@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;800&display=swap');

* { box-sizing:border-box; }

body {
  margin:0;
  min-height:100svh;
  font-family:'Poppins',sans-serif;
  background:radial-gradient(circle at top,#1a1b2e,#0c0d14);
  color:#f1f1f5;
  display:flex;
  justify-content:center;
  align-items:center;
  padding:20px;
}

.checkout {
  width:100%;
  max-width:480px;
}

.title {
  text-align:center;
  margin-bottom:24px;
  font-weight:800;
}

.card {
  background:rgba(255,255,255,.05);
  border-radius:20px;
  padding:20px;
  margin-bottom:20px;
}

.card h2 {
  margin-bottom:12px;
  font-size:1.1rem;
}

ul {
  list-style:none;
  padding:0;
  margin:0;
}

li {
  font-size:.9rem;
  margin-bottom:6px;
  color:#cfcfe8;
}

input {
  width:100%;
  padding:12px;
  border-radius:14px;
  border:none;
  margin-bottom:10px;
  background:rgba(255,255,255,.08);
  color:#fff;
}

input::placeholder {
  color:#aaa;
}

input.invalid {
  outline:2px solid #ff6a6a;
}

.error {
  font-size:.8rem;
  color:#ff6a6a;
  margin-top:8px;
}

.hidden {
  display:none;
}

button {
  width:100%;
  padding:14px;
  border:none;
  border-radius:18px;
  background:linear-gradient(135deg,#6a6aff,#8f8fff);
  color:#fff;
  font-weight:600;
  cursor:pointer;
}

/* BOTÓN VOLVER */
.back-btn {
  position: fixed;
  top: 16px;
  left: 16px;
  padding: 10px 14px;
  border-radius: 14px;
  background: rgba(255,255,255,.08);
  color: #fff;
  text-decoration: none;
  font-size: .85rem;
  backdrop-filter: blur(6px);
}