* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: #ffffff;
    color: #000000;
    line-height: 1.7;
    width: 100%;
    height: 100%;
    overflow-y: auto;
    overflow-x: hidden;
}

body {
    display: flex;
}

.back-button {
    position: fixed;
    top: 0;
    left: 0;
    width: 64px;
    height: 100vh;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 40px;
    z-index: 10;
}

.back-button a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    text-decoration: none;
    color: rgba(0, 0, 0, 0.6);
    transition: all 0.2s ease;
}

.back-button a:hover {
    background: rgba(0, 0, 0, 0.05);
    color: rgba(0, 0, 0, 0.9);
}

.back-button a svg {
    width: 20px;
    height: 20px;
}

.article-container {
    flex: 1;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    padding: 60px 80px 60px 64px;
}

.article-content {
    max-width: 640px;
    width: 100%;
    margin: auto 0;
}

.article-content h1 {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 40px;
    color: #000;
}

.article-content h2 {
    font-size: 18px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 12px;
    color: #000;
}

.article-content p {
    font-size: 15px;
    color: rgba(0, 0, 0, 0.72);
    margin-bottom: 16px;
    line-height: 1.8;
}

.article-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: 16px;
}

.article-content ul li {
    font-size: 15px;
    color: rgba(0, 0, 0, 0.72);
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
    line-height: 1.8;
}

.article-content ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 14px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.3);
}

.article-content .last-updated {
    margin-top: 48px;
    font-size: 13px;
    color: rgba(0, 0, 0, 0.36);
}

@media (max-width: 768px) {
    .back-button {
        width: 48px;
        padding-top: 20px;
    }

    .article-container {
        padding: 40px 24px 40px 48px;
    }

    .article-content h1 {
        font-size: 26px;
        margin-bottom: 32px;
    }
}