/* Reset mínimo — seguro para Lighthouse */
html, body {
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:"Poppins",sans-serif;
}

/* Evita recalcular en todos los elementos */
*, *::before, *::after {
  box-sizing:inherit;
}

/* Página */
html { font-size:16px; }

body{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  padding:20px;
  overflow:hidden;

  background:linear-gradient(120deg,#b4c09b,#f4b6b8,#f4a261,#5e7c50);
  background-size:200% 200%;
  animation:bgMove 16s ease infinite;
}

@keyframes bgMove{
  0%,100%{background-position:0 50%}
  50%{background-position:100% 50%}
}

/* Card */
main.login-card{
  width:100%;
  max-width:380px;
  padding:38px 32px;
  border-radius:18px;
  background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.18);
  box-shadow:0 4px 24px rgba(0,0,0,.15);
  text-align:center;
  animation:fadeSlideIn .8s ease;
}

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

/* Logo */
.logo{
  width:110px;
  margin-bottom:14px;
  animation:float 5s ease-in-out infinite;
}

@keyframes float{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-6px)}
}

h1{
  font-size:1.6rem;
  margin-bottom:12px;
  font-weight:600;
}

.subtitle{
  font-size:.9rem;
  opacity:.9;
  margin-bottom:22px;
}

/* Formulario */
form{
  margin-top:20px;
  text-align:left;
}

/* Inputs */
.input-box{
  position:relative;
  margin-bottom:26px;
}

.input-box input{
  width:100%;
  padding:14px 15px;
  border-radius:12px;
  border:2px solid rgba(255,255,255,.25);
  background:rgba(255,255,255,.15);
  color:#fff;
  font-size:1rem;
  transition:border .25s ease, background .25s ease;
}

.input-box input:focus{
  border-color:#f4b6b8;
  background:rgba(255,255,255,.25);
}

.input-box label{
  position:absolute;
  left:15px;
  top:50%;
  transform:translateY(-50%);
  color:#eee;
  font-size:1rem;
  opacity:.85;
  pointer-events:none;
  transition:.3s ease;
}

.input-box input:valid+label,
.input-box input:focus+label{
  top:-6px;
  font-size:.75rem;
  opacity:1;
}

/* Botón */
.btn{
  width:100%;
  padding:12px 20px;
  border:1px solid rgba(255,255,255,.6);
  background:rgba(255,255,255,.08);
  color:#fff;
  font-weight:600;
  font-size:16px;
  text-transform:uppercase;
  border-radius:12px;
  cursor:pointer;
  position:relative;
  overflow:hidden;
  transition:transform .25s ease, box-shadow .25s ease;
}

.btn:hover{
  transform:translateY(-2px);
  box-shadow:0 4px 14px rgba(255,255,255,.25);
}

.btn::before{
  content:"";
  position:absolute;
  top:0;
  left:-40px;
  width:0;
  height:100%;
  background:linear-gradient(90deg,#5e7c50,#b4c09b,#f4b6b8,#f4a261);
  transform:skewX(40deg);
  transition:width .35s ease;
}

.btn:hover::before{
  width:150%;
}

/* Link */
.forgot{
  display:block;
  margin-top:15px;
  font-size:.85rem;
  color:#fff;
  opacity:.85;
  text-decoration:none;
}

.forgot:hover{ opacity:1; }

/* Alertas */
.alert{
  background:#f8d7da;
  color:#842029;
  border:1px solid #f5c2c7;
  border-radius:8px;
  padding:12px 15px;
  margin-top:12px;
}

/* Disabled */
input:disabled,
.btn[disabled]{
  background:#ccc!important;
  cursor:not-allowed;
  opacity:.7;
}

/* Accesibilidad */
@media(prefers-reduced-motion:reduce){
  body, .logo, main.login-card, .btn {
    animation:none!important;
  }
}