body{
    margin:0;
    padding:0;
    min-height:100vh;
    background:linear-gradient(
        135deg,
        #141e30,
        #243b55
    );
    font-family:Arial, Helvetica, sans-serif;
    overflow:hidden;
}
/* =========================
   CONTENEDOR
========================= */
.clock-container{
    display:flex;
    justify-content:center;
    align-items:center;
    height:90vh;
}
/* =========================
   TARJETA
========================= */
.clock-card{
    background:rgba(255,255,255,0.08);
    border:1px solid rgba(255,255,255,0.2);
    backdrop-filter:blur(10px);
    padding:50px;
    border-radius:25px;
    text-align:center;
    color:white;
    width:90%;
    max-width:500px;
    box-shadow:
    0 0 25px rgba(0,0,0,0.5);
    animation:fade 1s;
}
/* =========================
   SALUDO
========================= */
#saludo{
    margin-bottom:25px;
    font-size:35px;
    font-weight:bold;
}
/* =========================
   RELOJ
========================= */
#clock{
    font-size:70px;
    font-weight:bold;
    color:#00ffcc;
    text-shadow:
    0 0 15px #00ffcc;
    margin-bottom:20px;
}
/* =========================
   FECHA
========================= */
#date{
    font-size:25px;
    color:#ddd;
}
/* =========================
   BOTON
========================= */
.btn{
    padding:12px 25px;
    border-radius:30px;
    font-weight:bold;
    transition:0.3s;
}
.btn:hover{
    transform:scale(1.05);
}
/* =========================
   ANIMACION
========================= */
@keyframes fade{
    from{
        opacity:0;
        transform:translateY(20px);
    }
    to{
        opacity:1;
        transform:translateY(0);
    }
}
/* =========================
   RESPONSIVE
========================= */
@media(max-width:768px){
    #clock{
        font-size:45px;
    }
    #date{
        font-size:20px;
    }
    #saludo{
        font-size:28px;
    }
}