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

body{
    background:#eaf4ff; /* Azul pastel suave */
}

.contenedor{
    width:420px;
    margin:40px auto;
    background:#ffffff;
    border-radius:10px;
    padding:20px;
    box-shadow:0 2px 8px rgba(0,0,0,0.15);
}

.tabs{
    display:flex;
    margin-bottom:20px;
}

.tab{
    width:50%;
    padding:10px;
    border:none;
    background:#d6e8ff;
    cursor:pointer;
    font-weight:bold;
}

.tab.activo{
    background:#4a90e2;
    color:white;
}

.logo{
    width:100px;
    display:block;
    margin:10px auto;
}

h2{
    text-align:center;
    color:#4a90e2;
    margin-bottom:15px;
}

label{
    display:block;
    margin-top:10px;
    margin-bottom:5px;
    color:#444;
}

input{
    width:100%;
    padding:8px;
    border:1px solid #bcd4f6;
    border-radius:5px;
}

.captcha{
    display:flex;
    gap:5px;
}

.captcha input:last-child{
    width:80px;
    background:#fff3b0;
    text-align:center;
    font-weight:bold;
}

.btnLogin,
.btnRegistro{
    width:100%;
    padding:10px;
    border:none;
    margin-top:15px;
    color:white;
    border-radius:5px;
    cursor:pointer;
}

.btnLogin{
    background:#4a90e2;
}

.btnRegistro{
    background:#5cb85c;
}

.btnLogin:hover{
    background:#357abd;
}

.btnRegistro:hover{
    background:#4a9d4a;
}