* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            background: var(--page-bg); color: var(--text-primary); min-height: 100vh;
        }
        .page-header {
            background: var(--surface); border-bottom: 1px solid var(--border);
            padding: 16px 24px; position: sticky; top: 0; z-index: 100;
        }
        .header-inner {
            max-width: 1200px; margin: 0 auto;
            display: flex; align-items: center; justify-content: space-between;
        }
        .logo-link { display: flex; align-items: center; text-decoration: none; gap: 10px; }
        .logo-img { height: 32px; width: auto; }
        .logo-text { font-size: 20px; font-weight: 700; color: var(--text-primary); }
        .header-actions { display: flex; align-items: center; gap: 12px; }
        .btn-back {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 8px 16px; border-radius: 6px; font-size: 14px; font-weight: 500;
            text-decoration: none; color: var(--text-secondary);
            background: var(--surface-soft); border: 1px solid var(--border); transition: all 0.15s ease;
        }
        .btn-back:hover { background: var(--primary-soft); color: var(--primary); }
        .btn-back .material-icons { font-size: 18px; }
        .theme-toggle {
            padding: 8px; border-radius: 6px; background: var(--surface-soft);
            border: 1px solid var(--border); cursor: pointer; color: var(--text-secondary);
            display: flex; align-items: center; justify-content: center;
        }
        .theme-toggle:hover { background: var(--primary-soft); color: var(--primary); }
        .theme-toggle .material-icons { font-size: 20px; }

        /* Article layout */
        .article-container { max-width: 800px; margin: 0 auto; padding: 40px 24px 80px; position: relative; }

        /* Cyan ambient backdrop - matches /pricing + /careers. */
        .article-container::before {
            content: "";
            position: absolute;
            inset: 0 0 auto 0;
            height: 520px;
            background:
                radial-gradient(ellipse 1100px 600px at 50% 0%, rgba(0,179,201,.12), transparent 65%),
                radial-gradient(ellipse 700px 400px at 50% 100%, rgba(0,179,201,.04), transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        .article-container > * { position: relative; z-index: 1; }
        [data-theme="dark"] .article-container::before {
            background:
                radial-gradient(ellipse 1100px 600px at 50% 0%, rgba(0,179,201,.20), transparent 65%),
                radial-gradient(ellipse 700px 400px at 50% 100%, rgba(0,179,201,.08), transparent 70%);
        }
        .article-header { margin-bottom: 32px; }
        .article-category {
            display: inline-block; padding: 4px 12px; border-radius: 12px;
            font-size: 13px; font-weight: 500; background: var(--primary-soft);
            color: var(--primary); margin-bottom: 16px;
        }
        .article-title { font-size: 36px; font-weight: 800; line-height: 1.2; margin-bottom: 16px; color: var(--text-primary); }
        .article-meta {
            display: flex; gap: 16px; align-items: center; flex-wrap: wrap;
            font-size: 14px; color: var(--text-muted); margin-bottom: 8px;
        }
        .article-meta-item { display: flex; align-items: center; gap: 4px; }
        .article-meta-item .material-icons { font-size: 16px; }
        .article-summary {
            font-size: 18px; line-height: 1.6; color: var(--text-secondary);
            border-left: 3px solid var(--primary); padding-left: 16px; margin-bottom: 32px;
            font-style: italic;
        }
        .article-content {
            font-size: 16px; line-height: 1.8; color: var(--text-secondary);
        }
        .article-content h2 { font-size: 24px; font-weight: 700; margin: 32px 0 16px; color: var(--text-primary); }
        .article-content h3 { font-size: 20px; font-weight: 600; margin: 24px 0 12px; color: var(--text-primary); }
        .article-content p { margin-bottom: 16px; }
        .article-content ul, .article-content ol { margin: 16px 0; padding-left: 24px; }
        .article-content li { margin-bottom: 8px; }
        .article-content a { color: var(--primary); text-decoration: underline; }
        .article-content blockquote {
            border-left: 3px solid var(--primary); padding: 12px 20px;
            margin: 24px 0; background: var(--surface-soft); border-radius: 0 8px 8px 0;
            font-style: italic; color: var(--text-secondary);
        }
        .article-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 16px 0; }
        .article-content pre {
            background: #1e1e2e; color: #e0e0e0; padding: 16px; border-radius: 8px;
            overflow-x: auto; margin: 16px 0; font-size: 14px;
        }
        .article-content code {
            background: var(--surface-soft); padding: 2px 6px; border-radius: 4px;
            font-size: 14px;
        }
        .article-content pre code { background: none; padding: 0; }

        /* Author box */
        .author-box {
            display: flex; gap: 16px; align-items: center;
            padding: 24px; background: var(--surface); border: 1px solid var(--border);
            border-radius: 12px; margin-top: 40px;
        }
        .author-avatar {
            width: 56px; height: 56px; border-radius: 50%; background: var(--primary);
            display: flex; align-items: center; justify-content: center; color: #fff;
            font-size: 24px; font-weight: 700; flex-shrink: 0;
        }
        .author-info h4 { font-size: 16px; font-weight: 600; color: var(--text-primary); }
        .author-info p { font-size: 14px; color: var(--text-muted); margin: 0; }

        /* Related posts */
        .related-section { margin-top: 48px; }
        .related-section h3 { font-size: 22px; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
        .related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
        .related-card {
            background: var(--surface); border: 1px solid var(--border);
            border-radius: 10px; padding: 16px; text-decoration: none;
            color: inherit; transition: all 0.2s;
        }
        .related-card:hover { border-color: var(--primary); transform: translateY(-2px); }
        .related-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 8px; color: var(--text-primary); }
        .related-card p { font-size: 13px; color: var(--text-muted); margin: 0; }

        /* Footer */
        .page-footer {
            text-align: center;
            padding: 32px;
            color: var(--text-muted, var(--text-secondary));
            font-size: 14px;
        }
        .page-footer a { color: var(--text-secondary); text-decoration: none; }
        .page-footer a:hover { color: var(--primary); }

        [data-theme="dark"] .icon-dark { display: none; }
        [data-theme="light"] .icon-light, :root:not([data-theme="dark"]) .icon-light { display: none; }
        [data-theme="dark"] .author-box { background: #131a2a; border-color: rgba(148,163,184,0.18); }
        [data-theme="dark"] .related-card { background: #131a2a; border-color: rgba(148,163,184,0.18); }