/* --- Reseteo básico y variables --- */
:root {
    --color-primario: #007bff;
    --color-gradiente: linear-gradient(90deg, #007bff, #0056b3);
    --color-texto: #e0e0e0;
    --color-fondo-tarjeta: rgba(255, 255, 255, 0.1);
    --color-borde: rgba(255, 255, 255, 0.2);
    --font-principal: 'Poppins', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-principal);
    background: #0f0c29;
    background: linear-gradient(to right, #24243e, #302b63, #0f0c29);
    color: var(--color-texto);
    
    /* Centrado perfecto con Flexbox */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

/* --- Contenedor Principal (Efecto Cristal) --- */
.login-container {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem;
    
    background: var(--color-fondo-tarjeta);
    border: 1px solid var(--color-borde);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    
    text-align: center;
}

.login-form h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #fff;
}

.login-form p {
    font-size: 1rem;
    font-weight: 300;
    margin-bottom: 2rem;
}

/* --- Grupos de Inputs --- */
.input-group {
    position: relative;
    width: 100%;
    margin-bottom: 1.5rem;
}

.input-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-texto);
    opacity: 0.5;
}

.input-group input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem; /* Padding izquierdo para el icono */
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--color-borde);
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    font-family: var(--font-principal);
}

.input-group input::placeholder {
    color: var(--color-texto);
    opacity: 0.7;
}

.input-group input:focus {
    outline: none;
    border-color: var(--color-primario);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.3);
}

/* --- Toggle de Contraseña --- */
.toggle-password {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-texto);
    cursor: pointer;
    opacity: 0.7;
}

/* --- Botón de Login --- */
.btn-login {
    width: 100%;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    background: var(--color-gradiente);
    color: #fff;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-principal);
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-login:hover {
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
    opacity: 0.9;
}

/* --- Mensaje de Error --- */
.error-box {
    width: 100%;
    background: rgba(255, 0, 0, 0.1);
    border: 1px solid rgba(255, 0, 0, 0.3);
    color: #ffcccc;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
}

/* --- Footer del Login --- */
.login-footer {
    margin-top: 1.5rem;
}

.login-footer a {
    color: var(--color-primario);
    text-decoration: none;
    font-size: 0.9rem;
}

.login-footer a:hover {
    text-decoration: underline;
}

/* --- Adaptable (Responsive) --- */
@media (max-width: 480px) {
    .login-container {
        margin: 1rem;
        padding: 1.5rem;
    }
    
    .login-form h2 {
        font-size: 1.8rem;
    }
}