body {
    background: #f8fafc;
    color: #222;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}
main {
    max-width: 500px;
    margin: 40px auto;
    padding: 24px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}
h1 {
    font-size: 1.6rem;
    margin-bottom: 2rem;
    text-align: center;
    font-weight: 700;
    letter-spacing: 1px;
    color: #2a4d7a;
}
#menu-container > div {
    margin-bottom: 2rem;
}
.menu-btn {
    background: #e3eafc;
    color: #2a4d7a;
    border: 1px solid #b6c6e3;
    border-radius: 4px;
    padding: 0.7rem 1.2rem;
    font-size: 1rem;
    cursor: pointer;
    margin: 0.3rem 0.3rem 0.3rem 0;
    transition: background 0.2s, color 0.2s, border 0.2s, box-shadow 0.2s;
    outline: none;
    box-shadow: 0 1px 2px rgba(42,77,122,0.04);
}
.menu-btn.selected, .menu-btn:active {
    background: #2a4d7a;
    color: #fff;
    border-color: #2a4d7a;
}
.menu-btn:hover:not(:disabled):not(.selected) {
    background: #b6c6e3;
    color: #2a4d7a;
}
.menu-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}