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

body {
    font-family: 'Segoe UI', sans-serif;
    background-image: url("https://img.freepik.com/vector-gratis/fondo-tecnologia-blanca-futurista_23-2148390336.jpg?semt=ais_hybrid&w=740");
    color: #222;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

.subtitulo {
    font-size: 1rem;
    color: #555;
}

.menu {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.btn {
    background-color: #d9e4ff;
    padding: 10px 20px;
    border: 2px solid #6495ed;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #a4c9ff;
}

.apps {
    position: relative;
    width: 90vw;
    max-width: 900px;
    height: 500px;
    border-radius: 8px;
    overflow: hidden;
}

.app {
    position: absolute;
    width: 100%;
    height: 100%;
    border: none;
    display: none;
}

#radio-notes:checked ~ header + .menu + .apps #frame-notes {
    display: block;
}

#radio-homeworks:checked ~ header + .menu + .apps #frame-homeworks {
    display: block;
}

#radio-weather:checked ~ header + .menu + .apps #frame-weather {
    display: block;
}

footer {
    margin-top: 20px;
    font-size: 0.9rem;
    color: #666;
}