body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f7;
    color: #333;
}

.container {
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #2a2a2a;
}

.download-section {
    text-align: center;
    padding: 20px;
    margin-top: 20px;
    border-radius: 8px;
    background-color: #f8f9fa;
}

.download-button {
    display: inline-block;
    background-color: #0071e3;
    color: white;
    font-weight: bold;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    margin-top: 15px;
    transition: background-color 0.2s;
}

.download-button:hover {
    background-color: #0051a2;
}

.os-icon {
    font-size: 48px;
    margin-bottom: 10px;
}

.hidden {
    display: none;
}

.manual-section {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.collapsible {
    background-color: #f1f1f1;
    color: #444;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    border-radius: 6px;
    margin-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
}

.collapsible:hover {
    background-color: #e7e7e7;
}

.collapsible:after {
    content: '\002B';
    font-weight: bold;
    float: right;
    margin-left: 5px;
    font-size: 20px;
}

.active:after {
    content: "\2212";
}

.content {
    padding: 0 18px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
    background-color: white;
}