*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Poppins',sans-serif;
}

body{
    height:100vh;
    /*background:url('./img/principal/fondo1.jpg?f<?=filemtime("./img/principal/fondo1.jpg")?>') no-repeat center center/cover;*/
    display:flex;
    justify-content:center;
    align-items:center;
    position:relative;
    overflow:hidden;
}

/* Cortina blanca */
body::before{
    content:"";
    position:absolute;
    width:100%;
    height:100%;
    background:rgba(149, 164, 248, 0.2);
    /*backdrop-filter:blur(1px);*/
}

/* Carrusel centrado más grande */
.carousel-container{
    position:relative;
    z-index:2;
    width:45vw;
    max-width:850px;
    min-width:300px;
    display:flex;
    justify-content:center;
    align-items:center;
    perspective:1200px; /* efecto 3D */
}

/* Cuadrado perfecto */
.carousel{
    position:relative;
    width:100%;
    aspect-ratio:1 / 1;
    border-radius:30px;
    overflow:hidden;
    box-shadow:
        0 40px 100px rgba(0,0,0,0.35),
        0 0 60px rgba(0,123,255,0.25);
    transform-style:preserve-3d;
    animation:float 6s ease-in-out infinite;
}

/* Animación flotante */
@keyframes float{
    0%,100%{ transform:translateY(0px) rotateX(0deg); }
    50%{ transform:translateY(-15px) rotateX(3deg); }
}

.carousel img{
    position:absolute;
    width:100%;
    height:100%;
    object-fit:cover;
    opacity:0;
    transition:opacity 1.2s ease, filter 1s ease, transform 1s ease;
}


/* Brillo dinámico */
.carousel::after{
    content:"";
    position:absolute;
    top:0;
    left:-100%;
    width:200%;
    height:100%;
    background:linear-gradient(
        120deg,
        transparent 40%,
        rgba(255,255,255,0.4) 50%,
        transparent 60%
    );
    animation:shine 5s infinite;
}

@keyframes shine{
    0%{ left:-100%; }
    100%{ left:100%; }
}


/* Barra login inferior ./img/baner_academia_2.jpg */
.login-bar{
    position:fixed;
    bottom:0;
    left:0;
    width:100%;
    padding:15px 30px;
    background:rgba(255,255,255,0.55);
    /*background:url('./img/baner_academia_2.jpg') no-repeat center center/cover;*/
    backdrop-filter:blur(15px);
    display:flex;
    justify-content:center;
    align-items:center;
    gap:15px;
    box-shadow:0 -5px 25px rgba(0,0,0,0.15);
    z-index:3;
}

.login-bar input[type="text"],
.login-bar input[type="password"]{
    padding:12px 15px;
    border-radius:10px;
    border:none;
    outline:none;
    min-width:200px;
    background:white;
    transition:0.3s;
}

.login-bar input[type="text"]:focus,
.login-bar input[type="password"]:focus{
    box-shadow:0 0 0 2px #4A90E2;
}

.login-button{
    padding:12px 25px;
    border:none;
    border-radius:10px;
    background:linear-gradient(135deg,#4A90E2,#007BFF);
    color:white;
    font-weight:600;
    cursor:pointer;
    transition:0.3s;
}

.login-button:hover{
    transform:translateY(-2px);
    box-shadow:0 10px 20px rgba(0,0,0,0.2);
}

.alert-danger{
    padding:1px 1px;
    border:none;
    /*background:linear-gradient(135deg,#e24a4a,#ff0000);*/
    color:rgb(221, 0, 0);
    font-weight:600;
    cursor:pointer;
    transition:0.3s;
}

/* Responsive */
@media(max-width:768px){
    .carousel{
        height:300px;
    }
    .login-bar{
        flex-direction:column;
        gap:10px;
    }
    .login-bar input{
        width:100%;
    }
}
@media (min-width:1600px){
    .carousel-container{
        width:35vw;
        max-width:1000px;
    }
}