.game-section {
    background: #0a0a0f4e;
    color: #e0f7fa;
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    height: 72vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.colorseq-container {
    background: rgba(0, 246, 255, 0.07);
    border: 2px solid #00f6ff;
    border-radius: 16px;
    padding: 2rem 2.5rem;
    box-shadow: 0 4px 24px rgba(0,246,255,0.08);
    text-align: center;
    min-width: 350px;
    min-height: 400px;
    position: relative;
}

#color-board {
    display: grid;
    grid-template-columns: repeat(2, 80px);
    grid-gap: 20px;
    justify-content: center;
    margin: 2rem auto 1.5rem auto;
}

.color-btn {
    width: 80px;
    height: 80px;
    border-radius: 18px;
    border: none;
    outline: none;
    cursor: pointer;
    transition: filter 0.15s, box-shadow 0.15s;
    box-shadow: 0 2px 12px #00f6ff22;
    opacity: 0.95;
}

#red { background: #ff5252; }
#green { background: #00e676; }
#blue { background: #2979ff; }
#yellow { background: #fff176; }

.color-btn.active {
    filter: brightness(2.2);
    box-shadow: 0 0 24px 8px #fff;
    opacity: 1;
}

#info {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    width: 220px;
    margin-left: auto;
    margin-right: auto;
}

#game-over {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #0a0a0fdd;
    color: #fff;
    padding: 2rem 3rem;
    border-radius: 12px;
    font-size: 1.3rem;
    z-index: 10;
}

.hidden {
    display: none;
}

.popup {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(10,10,15,0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}
.popup-content {
    background: #11131a;
    color: #e0f7fa;
    padding: 2rem 2.5rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 24px rgba(0,246,255,0.18);
}
#start-btn {
    margin-top: 1rem;
    padding: 0.7rem 2rem;
    border-radius: 8px;
    border: none;
    background: #00f6ff;
    color: #0a0a0f;
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.2s;
}
.popup.hidden {
    display: none;
}