* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #ffffff;
    display: flex;
    justify-content: center;
    padding: 50px 20px;
}

.container {
    max-width: 680px;
    width: 100%;
    padding: 40px 20px;
}

.profile {
    text-align: center;
    margin-bottom: 40px;
}

.avatar {
    width: 0px;
    height: 120px;
    border-radius: 60px;
    margin-bottom: 20px;
    object-fit: cover;
    display: flex;
    justify-content: center;
    margin-left: auto;
    margin-right: auto;
}

.name {
    font-size: 24px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 10px;
}

.bio {
    font-size: 16px;
    color: #86868b;
    margin-bottom: 30px;
}

.links {
    list-style: none;
}

.link-item {
    background-color: #f2f2f2;
    border-radius: 12px;
    margin-bottom: 12px;
    transition: transform 0.2s ease, background-color 0.2s ease;
}

.link-item:hover {
    transform: scale(1.02);
    background-color: #e2e2e2;
}

.link-item a {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    text-decoration: none;
    color: #1d1d1f;
}

.link-icon {
    width: 24px;
    height: 24px;
    margin-right: 12px;
}

.link-text {
    font-size: 16px;
    font-weight: 500;
}

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }

    .avatar {
        width: 100px;
        height: 100px;
    }

    .name {
        font-size: 20px;
    }

    .bio {
        font-size: 14px;
    }
}

.beian {
    text-align: center;
    margin-top: 100px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.beian a {
    color: #86868b;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
}

.beian a:hover {
    color: #1d1d1f;
    transform: scale(1.02);
}

.collapsible-header {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    cursor: pointer;
}

.collapsible-content {
    padding: 0 20px 16px 20px;
}

.download-button {
    display: inline-block;
    margin-top: 12px;
    padding: 10px 16px;
    background-color: #f2f2f2;
    color: #1d1d1f;
    text-decoration: none;
    border-radius: 8px;
    font-size: 14px;
    border: 1px solid #d4d4d4;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.download-button:hover {
    background-color: #e6e6e6;
    border-color: #c0c0c0;
}