:root {
  --color-accent: #0077ff;
  --color-text: #fff;
  --radius: 20px;
  --transition: all 0.3s ease;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  width: 100vw;
  font-family: "Inter", sans-serif;
  background: linear-gradient(135deg, #111, #333);
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
  padding-bottom: constant(safe-area-inset-bottom);
    padding-bottom: env(safe-area-inset-bottom);
}

.background-circle {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 0, 0, 0.8) 0%, rgba(255, 0, 0, 0.1) 70%);
  border-radius: 50%;
  z-index: 0;
  filter: blur(50px);
  animation: pulse 4s ease-in-out infinite alternate;
}

@keyframes pulse {
  from { transform: translate(-50%, -50%) scale(1); }
  to { transform: translate(-50%, -50%) scale(1.1); }
}

.card {
  position: relative;
  z-index: 1;
  width: 90%;
  height: 80%;
  padding: 2rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(15px);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.3);
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 450px;
  transition: var(--transition);
  animation: fadeIn 1s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  font-size: 1.8rem;
  color: #fff;
  text-align: center;
  margin-bottom: 1.5rem;
  letter-spacing: 1px;
}

label {
  margin-top: 1rem;
  font-weight: 500;
}

input, select {
  width: 100%;
  padding: 0.7rem;
  margin-top: 0.3rem;
  border: none;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 1rem;
  transition: var(--transition);
}

input:focus, select:focus {
  background: rgba(255, 255, 255, 0.2);
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 119, 255, 0.3);
}

button {
  margin-top: 1.5rem;
  padding: 0.9rem;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

button:hover {
  background: #005ed1;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 119, 255, 0.4);
}

.resultado {
  margin-top: 1.5rem;
  font-size: 1.4rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition);
  text-align: center;
}

.resultado.visible {
  opacity: 1;
  transform: translateY(0);
}

footer {
  margin-top: 2rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
}

@media (max-width: 500px) {
  .card {
    padding: 1.5rem;
    height: auto;
  }
  h1 {
    font-size: 1.4rem;
  }
}