body {
    background-color: #1a1a1a;
    color: white;
    font-family: 'Segoe UI', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.game-container {
    background: #2d2d2d;
    padding: 20px;
    border-radius: 15px;
    text-align: center;
    width: 350px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.timer-section {
    font-size: 1.5rem;
    color: #ff4757;
    margin-bottom: 20px;
}

.number-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    background: #000;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.num-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

.red-bg { background-color: #ff4757; }
.green-bg { background-color: #2ed573; }

.result-box {
    background: #1e1e1e;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    border: 1px solid #444;
}

.btn {
    padding: 15px 30px;
    border: none;
    border-radius: 25px;
    color: white;
    font-weight: bold;
    cursor: pointer;
    margin: 5px;
    width: 100px;
    transition: transform 0.1s;
}

.btn:active { transform: scale(0.95); }
.big { background-color: #ffa502; }
.small { background-color: #1e90ff; }
.red { background-color: #ff4757; }
.green { background-color: #2ed573; }

.go-btn {
    margin-top: 20px;
    padding: 15px 60px;
    background: linear-gradient(to bottom, #7bed9f, #2ed573);
    border: none;
    border-radius: 10px;
    font-size: 1.2rem;
    color: white;
    font-weight: bold;
    cursor: pointer;
}

.selected {
    outline: 4px solid white;
    box-shadow: 0 0 15px white;
}