:root{
  --bg: #0a0a1a;                  /* Fondo general */
  --card-bg: #0f1030;             /* Fondo del formulario */
  --border: #2a2a5a;              /* Borde base */
  --border-focus: #6b7bff;        /* Borde en foco */
  --label: #c9c9ff;               /* Color de labels */
  --text: #ffffff;                /* Texto principal */
  --muted: #b6b6d6;               /* Texto secundario / placeholders */
  --accent-1: #7c4dff;            /* Gradiente botón (inicio) */
  --accent-2: #00d4ff;            /* Gradiente botón (fin) */
  --success: #28c76f;             /* Éxito */
  --error: #ff4d6d;               /* Error */
  --shadow: 0 12px 30px rgba(0,0,0,.35), 0 6px 16px rgba(20,20,60,.25);
  --radius: 16px;
  --radius-sm: 10px;
  --focus-ring: 0 0 0 4px rgba(107,123,255,0.25);
}

/* Contenedor del formulario */
form {
  margin: 32px auto;
  width: min(100%, 480px);
  padding: 28px;
  background: linear-gradient(180deg, rgba(15,16,48,0.95), rgba(10,10,26,0.95));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
  color: var(--text);
  position: relative;
  overflow: hidden;
}

/* Efecto sutil decorativo */
form::before{
  content: "";
  position: absolute;
  inset: -40% -40% auto auto;
  width: 360px;
  height: 360px;
  background: radial-gradient(closest-side, rgba(124,77,255,0.25), transparent 70%);
  transform: rotate(25deg);
  pointer-events: none;
}

/* Título opcional dentro del formulario */
form .form-title{
  margin: 0 0 6px 0;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: .3px;
}

form .form-subtitle{
  margin: 0 0 18px 0;
  color: var(--muted);
  font-size: .95rem;
}

/* Etiquetas */
label {
  display: block;
  margin-top: 18px;
  margin-bottom: 6px;
  letter-spacing: .5px;
  color: var(--label);
  font-weight: 600;
  font-size: .95rem;
}

/* Agrupador de campo (para estados y mensajes) */
.form-field{
  position: relative;
}

/* Inputs y textarea */
input,
textarea {
  width: 92%;
  min-height: 44px;
  background: #0B0B3B;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-top: 4px;
  font-size: 16px;
  color: var(--text);
  outline: none;
  transition: border-color .20s ease, box-shadow .20s ease, transform .05s ease;
  box-shadow: inset 0 0 0 rgba(0,0,0,0);
}

textarea{
  min-height: 140px;
  resize: vertical;
}

/* Placeholders */
input::placeholder,
textarea::placeholder{
  color: var(--muted);
  opacity: .85;
}

/* Focus visible accesible */
input:focus-visible,
textarea:focus-visible {
  border-color: var(--border-focus);
  box-shadow: var(--focus-ring);
}

/* microfeedback al teclear */
input:active,
textarea:active{
  transform: translateY(0px);
}

/* Estados: error / éxito (añadir .is-error o .is-success al input) */
input.is-error,
textarea.is-error{
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(255,77,109,0.2);
}

input.is-success,
textarea.is-success{
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(40,199,111,0.2);
}

/* Mensajes de ayuda / error */
.field-hint{
  margin-top: 6px;
  font-size: .85rem;
  color: var(--muted);
}

.field-error{
  margin-top: 6px;
  font-size: .85rem;
  color: var(--error);
  font-weight: 600;
}

/* Botón enviar */
#submit,
button[type="submit"]{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 46px;
  margin-top: 22px;
  border: none;
  cursor: pointer;
  border-radius: 999px;
  color: #0a0a1a;
  font-weight: 800;
  letter-spacing: .3px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
  box-shadow: 0 10px 24px rgba(0, 212, 255, 0.24), 0 6px 16px rgba(124,77,255,0.20);
  transition: transform .12s ease, box-shadow .2s ease, filter .2s ease;
}

#submit:hover,
button[type="submit"]:hover{
  transform: translateY(-1px);
  filter: brightness(1.06);
  box-shadow: 0 12px 28px rgba(0, 212, 255, 0.28), 0 8px 20px rgba(124,77,255,0.24);
}

#submit:active,
button[type="submit"]:active{
  transform: translateY(0);
}

#submit:disabled,
button[type="submit"]:disabled{
  opacity: .6;
  cursor: not-allowed;
  filter: grayscale(.15);
}

/* Línea divisoria opcional */
.form-divider{
  margin: 18px 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.12), transparent);
  border: 0;
}

/* Info pequeña (ej. aviso de privacidad) */
.form-footnote{
  margin-top: 12px;
  font-size: .82rem;
  color: var(--muted);
}

/* Responsive */
@media (max-width: 520px){
  form{
    padding: 20px 16px;
    border-radius: 14px;
  }
  label{
    margin-top: 14px;
  }
}

/* Preferencia de reducción de movimiento */
@media (prefers-reduced-motion: reduce){
  * {
    transition: none !important;
    animation: none !important;
  }
}