body {
    background: #0288d1;
    font-family: 'Segoe UI', Arial, sans-serif;
    color: #fff;
    text-align: center;
    margin: 0;
    padding: 0;
    /* Subtle SVG wave pattern overlay */
    background-image: url('data:image/svg+xml;utf8,<svg width="100%25" height="100%25" xmlns="http://www.w3.org/2000/svg"><path d="M0 20 Q 50 40 100 20 T 200 20 T 300 20 T 400 20 T 500 20 T 600 20 T 700 20 T 800 20 V1000 H0 Z" fill="%2300bcd4" fill-opacity="0.13"/></svg>');
    background-repeat: repeat-x;
    background-size: 800px 60px;
}

h1 {
    margin-top: 24px;
    font-size: 2.2em;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 2px 2px 8px #0288d1, 0 0 12px #fff;
}

#setupScreen, #winnerScreen {
    margin: 40px auto;
    background: rgba(255,255,255,0.92);
    border: 2px solid #0288d1;
    border-radius: 16px;
    width: 400px;
    padding: 32px 0 24px 0;
    box-shadow: 0 4px 24px #0288d155;
    color: #01579b;
}

.difficulty-select {
    display: flex;
    justify-content: space-around;
    margin: 18px 0 24px 0;
}

label {
    font-size: 1.1em;
    color: #0288d1;
}

select {
    margin-left: 8px;
    font-size: 1em;
    padding: 2px 8px;
    border-radius: 4px;
    border: 1px solid #b3e5fc;
}

button {
    font-size: 1.1em;
    padding: 8px 28px;
    background: #0288d1;
    color: #fff;
    border: none;
    border-radius: 8px;
    box-shadow: 1px 1px 0 #01579b;
    cursor: pointer;
    margin-top: 10px;
    transition: background 0.2s;
}
button:hover {
    background: #01579b;
}

#gameCanvas {
    display: block;
    margin: 32px auto 0 auto;
    background: #0288d1;
    border: 6px solid #0288d1;
    border-radius: 16px;
    box-shadow: 0 2px 18px #0288d155;
}

.hidden {
    display: none;
}

#winnerText {
    color: #0288d1;
    font-size: 1.5em;
    margin-bottom: 18px;
}