body {
    background: #232323;
    color: #fff;
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    min-height: 100vh;
}
.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 30px 20px;
    background: #333;
    border-radius: 18px;
    box-shadow: 0 0 16px #0008;
    text-align: center;
}
h1 {
    margin-bottom: 18px;
}
#balance {
    margin-bottom: 16px;
    font-size: 1.2em;
}
.betting {
    margin-bottom: 18px;
    overflow: auto;
}
input[type="number"] {
    width: 80px;
    padding: 6px 8px;
    border-radius: 5px;
    border: none;
    margin-right: 6px;
}
select {
    padding: 6px 8px;
    border-radius: 5px;
    border: none;
    margin-right: 6px;
}
button {
    padding: 6px 18px;
    background: #f39c12;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-weight: bold;
    cursor: pointer;
    transition: background .15s;
}
button:active {
    background: #d35400;
}
#free-zetony-btn {
    float: right;
    margin-right: 0;
    margin-left: 15px;
    background: #27ae60;
}
#free-zetony-btn:active {
    background: #1e8449;
}
.roulette-bar-wrapper {
    position: relative;
    width: 600px;
    margin: 0 auto 10px auto;
    height: 70px;
}
.arrow-bar {
    position: absolute;
    left: 50%;
    top: 0;
    transform: translateX(-50%);
    font-size: 2em;
    z-index: 2;
    color: #fff;
    text-shadow: 0 1px 8px #000;
    pointer-events: none;
    height: 25px;
    line-height: 25px;
}
#roulette-bar {
    display: block;
    margin: 0 auto;
    background: #222;
    border-radius: 12px;
    box-shadow: 0 0 12px #111b;
}
#result {
    min-height: 30px;
    font-size: 1.15em;
    margin-top: 12px;
    font-weight: bold;
}