* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            background: #ffffff;
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            color: #1f2329;
            line-height: 1.7;
        }
        .top-header {
            position: fixed;
            top: 0; left: 0; right: 0;
            background: #ffffff;
            border-bottom: 1px solid #e5e6eb;
            z-index: 100;
        }
        .header-inner {
            max-width: 720px;
            margin: 0 auto;
            padding: 0 24px;
            height: 56px;
            display: flex;
            align-items: center;
        }
        .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .brand-icon {
            width: 28px;
            height: 28px;
            object-fit: contain;
            display: block;
        }
        .brand-text {
            font-size: 16px;
            font-weight: 600;
            color: #1f2329;
        }
        .brand:hover .brand-text { color: #2563eb; }
        .main-content {
            max-width: 720px;
            margin: 0 auto;
            padding: 88px 24px 60px;
        }
        h1 {
            font-size: 28px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .meta {
            color: #8a9099;
            font-size: 13px;
            margin-bottom: 32px;
            padding-bottom: 20px;
            border-bottom: 1px solid #f2f3f5;
        }
        h2 {
            font-size: 16px;
            font-weight: 600;
            margin-top: 28px;
            margin-bottom: 10px;
            color: #1f2329;
        }
        p {
            font-size: 14px;
            color: #4a4f56;
            margin-bottom: 12px;
        }
        ul {
            padding-left: 22px;
            margin-bottom: 12px;
        }
        li {
            font-size: 14px;
            color: #4a4f56;
            margin-bottom: 6px;
        }
        code {
            background: #f2f3f5;
            padding: 1px 6px;
            border-radius: 3px;
            font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
            font-size: 13px;
            color: #1f2329;
        }
        a {
            color: #2563eb;
            text-decoration: none;
        }
        a:hover { text-decoration: underline; }
        .footer {
            max-width: 720px;
            margin: 40px auto 0;
            padding: 20px 24px;
            text-align: center;
            font-size: 12px;
            color: #9ca3af;
            border-top: 1px solid #f0f0f0;
        }