* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background: linear-gradient(to right, #6a11cb, #2575fc);
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
}

.container {
    background: rgba(0, 0, 0, 0.6);
    padding: 20px 30px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    max-width: 400px;
    width: 100%;
}

h1 {
    font-weight: 700;
    margin-bottom: 10px;
}

.instruction {
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin: 20px 0;
}

.tile {
    width: 100%;
    height: 120px;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.1s ease;
}

.tile:active {
    transform: scale(0.95);
}

#green { background-color: #34d399; }
#red { background-color: #f87171; }
#yellow { background-color: #fde047; }
#blue { background-color: #60a5fa; }

.controls {
    margin-top: 20px;
}

button {
    background-color: #22d3ee;
    color: #000;
    font-weight: bold;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #0891b2;
}

.score {
    margin-top: 15px;
    font-weight: 500;
}