body {
    background-color: #004E98; /* Color de fondo por defecto XP */
    font-family: "Tahoma", "Segoe UI", sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

/* Contenedor principal estilo Ventana XP */
.xp-window {
    width: 400px;
    background-color: #ECE9D8; /* Fondo Gris Arena */
    border: 3px solid #0054E3;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    box-shadow: 4px 4px 10px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

/* Barra de título con el degradado solicitado */
.xp-title-bar {
    background: linear-gradient(to bottom, #0054E3 0%, #2257D6 10%, #0840A5 100%);
    padding: 5px 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: white;
    font-weight: bold;
    text-shadow: 1px 1px 1px #000;
}

.xp-title-controls i {
    background-color: #316AC5;
    border: 1px solid #FFFFFF;
    border-radius: 3px;
    padding: 0 4px;
    font-size: 0.8rem;
    cursor: pointer;
}

.xp-title-controls .bi-x-lg {
    background-color: #DE482B; /* Botón de cerrar rojo */
}

/* Cuerpo de la ventana */
.xp-window-body {
    padding: 25px;
    border: 1px solid #FFFFFF; /* Brillo interno */
}

.form-label {
    font-size: 0.9rem;
    color: #000;
    margin-bottom: 2px;
}

.form-control {
    border-radius: 0;
    border: 2px solid #7F9DB9; /* Borde clásico de input XP */
    font-size: 0.9rem;
}

.form-control:focus {
    box-shadow: none;
    border-color: #245EDC;
}

/* Botón estilo XP */
.btn-xp {
    background: linear-gradient(to bottom, #FFFFFF 0%, #EFEFEF 50%, #DCDCDC 100%);
    border: 1px solid #003C74;
    color: #000;
    padding: 5px 20px;
    border-radius: 3px;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-xp:hover {
    border-color: #FF9F00; /* Resalte naranja típico */
    background: #EFEFEF;
}

/* Botón Inicio (Verde) */
.btn-start {
    background: linear-gradient(to bottom, #54B435 0%, #388E3C 100%);
    color: white;
    border: 1px solid #2D5E2D;
    border-radius: 0 5px 5px 0;
    font-style: italic;
    font-weight: bold;
}

.footer-info {
    font-size: 0.75rem;
    color: #ACA899;
    text-align: center;
    margin-top: 15px;
}