* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Segoe UI", sans-serif;
}

body {
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.app-wrapper {
    max-width: 900px;
    width: 100%;
    background: #111;
    border-radius: 16px;
    padding: 30px;
    text-align: center;
    color: #fff;
}

.title {
    font-size: 28px;
    margin-bottom: 10px;
}

.description {
    font-size: 14px;
    color: #bbb;
    margin-bottom: 25px;
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.color-box {
    height: 120px;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.color-box:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0,0,0,0.4);
}

.hint {
    margin-top: 20px;
    font-size: 13px;
    color: #aaa;
}

/* Mobile Responsive */
@media (max-width: 600px) {
    .color-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .color-box {
        height: 100px;
    }

    .app-wrapper {
        padding: 20px;
    }
}