body {
    font-family: 'San Francisco', -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
    background-color: #121212; /* Dark background */
    color: #e0e0e0; /* Light text color */
    margin: 0;
    padding: 0;
}

header {
    background-color: #1f1f1f; /* Darker header */
    color: #fff;
    padding: 20px 10px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 1.5em;
}

header p {
    margin: 5px 0;
    font-size: 1em;
    color: #bbbbbb; /* Softer gray for subtitle text */
}

main {
    width: 90%;
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 10px;
}

.section {
    margin-bottom: 15px;
}

.section h2 {
    font-size: 1.2em;
    background-color: #333; /* Darker section background */
    color: #e0e0e0; /* Light text */
    padding: 10px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 4px;
    position: relative;
}

.section h2::after {
    content: '▼';
    font-size: 0.9em;
    color: #bbbbbb; /* Softer gray arrow */
    position: absolute;
    right: 10px;
    transition: transform 0.3s ease;
}

.section.open h2::after {
    transform: rotate(180deg);
}

.item {
    margin: 5px 0;
    padding-left: 15px;
    display: none;
    position: relative;
}

.item h3 {
    font-size: 1em;
    color: #4a90e2; /* Bright blue for links */
    cursor: pointer;
}

.item h3::after {
    content: '▼';
    font-size: 0.8em;
    color: #bbbbbb;
    margin-left: 10px;
    transition: color 0.3s ease;
}

.item h3:hover::after {
    color: #888;
}

.item p {
    margin: 5px 0;
    color: #bbbbbb; /* Softer gray for paragraph text */
    display: none;
}

footer {
    background-color: #1f1f1f; /* Dark footer background */
    color: #e0e0e0; /* Light text */
    text-align: center;
    padding: 10px;
    position: relative;
    width: 100%;
}

/* Mobile responsive */
@media (max-width: 600px) {
    header {
        padding: 15px 5px;
    }

    header h1 {
        font-size: 1.2em;
    }

    header p {
        font-size: 0.9em;
    }

    .section h2 {
        font-size: 1em;
    }

    .item h3 {
        font-size: 0.9em;
    }
}