body {
    font-family: Georgia, serif;
    text-align: center;
    background: #fafafa;
}

h1 {
    margin-top: 30px;
}

.feature-card-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    max-width: 900px;
    margin: 20px auto;
    padding: 0 20px;
}

.feature-card {
    position: relative;
    padding: 25px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: #fff;
    cursor: pointer;
    transition:
        transform .15s ease,
        box-shadow .15s ease,
        border-color .15s ease;
    /* border transition */
}

/* lighter shadow + border color change */
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    /* lighter shadow */
    border-color: #bbb;
    /* softer border on hover */
}

.feature-card h3,
.feature-card p {
    margin: 5px 0;
}

/* custom checkbox */
.feature-card input[type="checkbox"] {
    appearance: none;
    width: 18px;
    height: 18px;
    border: 2px solid #777;
    border-radius: 4px;
    position: absolute;
    top: 10px;
    right: 10px;
}

.feature-card input[type="checkbox"]::after {
    content: "✓";
    color: white;
    font-size: 13px;
    display: none;
}

.feature-card input[type="checkbox"]:checked {
    background: #4caf50;
    border-color: #3a8f3c;
}

.feature-card input[type="checkbox"]:checked::after {
    display: block;
    position: relative;
    top: -1px;
    left: 3px;
}

@media (max-width: 600px) {
    .feature-card-container {
        grid-template-columns: 1fr;
    }
}