/* Definición de colores base */
:root {
    --primary-color: #4caf50; 
    --primary-light: rgb(150, 225, 150); 
    --secondary-color: #333;
    --text-label: #555;
    --text-link: #4caf50;
    --card-bg: #ffffff;
    --border-color: #ccc;
}

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

/* Estilo del cuerpo (fondo y centrado principal) */
body {
    background: var(--primary-light);
    display: flex;
    justify-content: center; /* Centrado horizontal */
    align-items: center;    /* Centrado vertical por defecto */
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

.message-error {
    color: red;
    text-align: center;
    margin-bottom: 10px;
}

/* --- CONTENEDORES PRINCIPALES (Login y Registro) --- */
.signup-container { /* Usado por ambos en tu HTML */
    max-width: 450px;
    width: 100%; 
    padding: 30px;
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    font-family: Arial, sans-serif;
    margin: 0; 
}

/* --- Encabezados y Contenido (Mismos estilos) --- */
.signup-header {
    text-align: center;
    margin-bottom: 25px;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 15px;
}

.signup-header h1 {
    font-size: 1.8em;
    color: var(--secondary-color);
    margin-bottom: 5px;
}

.signup-header p {
    font-size: 0.9em;
    color: #666;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: var(--text-label);
    font-size: 0.9em;
}

.inputs {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 1em;
    transition: border-color 0.3s ease;
}

.inputs:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 5px rgba(76, 175, 80, 0.5);
}

select.inputs {
    appearance: none;
    background-image: url('data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23000000%22%20d%3D%22M287%20172.9L146.2%2032.1%205.4%20172.9c-2.2%202.2-5.1%203.3-8.3%203.3s-6.1-1.1-8.3-3.3c-4.4-4.4-4.4-11.4%200-15.8L137.9%207.7c4.4-4.4%2011.4-4.4%2015.8%200l138.5%20138.5c4.4%204.4%204.4%2011.4%200%2015.8-4.4%204.4-11.4%204.4-15.8%200z%22%20transform%3D%22rotate(180%20146.2%20146.2)%22%2F%3E%3C%2Fsvg%3E');
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 12px auto;
    padding-right: 30px;
}

/* --- BOTÓN PRINCIPAL --- */
.botones {
    width: 100%;
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
    font-size: 1.1em;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s;
    margin-top: 10px;
}

.botones:hover {
    background-color: #43a047;
    transform: translateY(-1px);
}

/* --- Enlaces (Login/Register link) --- */
.login-link, .register-link {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9em;
    color: #777;
}

.links {
    color: var(--text-link);
    text-decoration: none;
    font-weight: bold;
}

.links:hover {
    text-decoration: underline;
}

/* --- BOTÓN DE REGRESO/VOLVER --- */
.return {
    position: absolute;
    top: 20px;
    left: 20px;
    color: #fff;
    text-decoration: none;
    font-size: 1em;
    font-weight: bold;
    background: rgba(99, 185, 99, 0.8); 
    font-family: Arial, sans-serif;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.3s ease, transform 0.1s;
    z-index: 10;
}

.return:hover {
    background-color: var(--primary-color);
    transform: translateY(-1px);
}

/* =================================
   MEDIA QUERIES - RESPONSIVE DESIGN
   ================================= */

/* !Mobile (max-width: 599px) */
@media (max-width: 599px) {
    /* El centrado vertical ya está en el body principal, pero si quieres forzarlo en mobile
       para los formularios cortos (como Login), aseguramos que el body use 'center'.
       NOTA: Si el formulario de Registro es muy largo, esto podría requerir scroll.
    */
    body {
        /* Para formularios cortos como Login, mantener centrado vertical (align-items: center) */
        align-items: center; 
        padding-top: 20px; /* Reducimos el padding superior */
    }
    
    .signup-container {
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        /* Quitamos el margin: 0 auto; ya que flexbox lo centra */
        margin: 0;
    }

    .signup-header h1 {
        font-size: 1.6em;
    }

    .inputs {
        padding: 10px;
        font-size: 0.95em;
    }
    
    .botones {
        padding: 12px;
        font-size: 1em;
    }

    .return {
        top: 15px;
        left: 15px;
        padding: 8px 12px;
        font-size: 0.9em;
    }
}

/* !Tablet (min-width: 600px and max-width: 899px) */
@media (min-width: 600px) and (max-width: 899px) {
    .signup-container {
        max-width: 400px;
        padding: 35px;
    }
    
    .signup-header h1 {
        font-size: 1.7em;
    }
}

/* !Desktop (min-width: 900px) */
@media (min-width: 900px) {
    body {
        align-items: center; 
    }
    
    .signup-container {
        max-width: 450px;
        padding: 40px;
    }
    
    .signup-header h1 {
        font-size: 1.9em;
    }
    
    .botones {
        padding: 16px;
    }

    .return {
        background: var(--primary-color);
    }
}