/* Fondo con gradiente moderno */
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #e0dbe1f2, #727275);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Contenedor principal */
.login-container {
    background: #fff;
    padding: 20px 35px;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    width: 400px;
    text-align: center;
    animation: fadeIn 1s ease-in-out;
}

/* Título */
.login-container h2 {
    margin-bottom: 25px;
    color: #333;
    font-size: 22px;
    font-weight: 600;
}

/* Etiquetas */
label {
    display: block;
    text-align: left;
    margin: 10px 0 5px;
    font-size: 18px;
    font-weight: 600;
    color: #444;
}

/* Inputs */
input[type="text"],
input[type="password"] {
    width: 88%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 15px;
    transition: all 0.3s;
}

input[type="text"]:focus,
input[type="password"]:focus {
    border-color: #b5b0b3;
    outline: none;
    box-shadow: 0 0 6px rgba(22, 144, 225, 0.662);
}

/* Botón */
button {
    width: 97%;
    padding: 12px;
    background: linear-gradient(135deg, #1246c8, #9f177b);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, background 0.3s;
}

button:hover {
    transform: scale(1.05);
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
}

/* Mensaje de error */
.error {
    margin-top: 15px;
    color: #e53e3e;
    font-size: 14px;
    font-weight: bold;
    background: #ffe0e0;
    padding: 8px;
    border-radius: 8px;
    animation: shake 0.4s;
}

/* Animaciones */
@keyframes fadeIn {
    from {opacity: 0; transform: translateY(-20px);}
    to {opacity: 1; transform: translateY(0);}
}

@keyframes shake {
    0% {transform: translateX(0);}
    25% {transform: translateX(-5px);}
    50% {transform: translateX(5px);}
    75% {transform: translateX(-5px);}
    100% {transform: translateX(0);}
}
/* =========================================
   RESPONSIVE — TABLETS
========================================= */
@media (max-width: 900px) {

    body {
        padding: 20px;
        height: auto;
        min-height: 100vh;
    }

    .login-container {
        width: 90%;
        padding: 20px 25px;
        border-radius: 14px;
    }

    label {
        font-size: 16px;
    }

    input[type="text"],
    input[type="password"] {
        width: 95%;
        font-size: 15px;
        padding: 11px;
    }

    button {
        width: 100%;
        font-size: 16px;
    }
}


/* =========================================
   RESPONSIVE — CELULARES
========================================= */
@media (max-width: 480px) {

    body {
        padding: 15px;
        align-items: flex-start;
    }

    .login-container {
        width: 100%;
        padding: 18px 18px;
        border-radius: 12px;
        margin-top: 40px;
    }

    .login-container h2 {
        font-size: 20px;
        margin-bottom: 18px;
    }

    label {
        font-size: 15px;
    }

    input[type="text"],
    input[type="password"] {
        width: 100%;
        font-size: 14px;
        padding: 10px;
        border-radius: 8px;
    }

    button {
        padding: 11px;
        font-size: 15px;
        border-radius: 8px;
    }

    .error {
        font-size: 13px;
        padding: 6px;
    }
}