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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            color: #374151;
            background: #ffffff;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        .container {
            max-width: 720px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        header {
            padding: 40px 0 32px;
            border-bottom: 1px solid #e5e7eb;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .logo {
            font-size: 1.6rem;
            font-weight: 700;
            color: #111827;
            letter-spacing: -0.5px;
            text-decoration: none;
        }

        .logo span {
            color: #2563eb;
        }

        .logo:hover {
            text-decoration: none;
        }

        .lang-toggle {
            display: flex;
            gap: 0;
            border: 1px solid #d1d5db;
            border-radius: 6px;
            overflow: hidden;
        }

        .lang-btn {
            padding: 6px 14px;
            font-size: 0.8rem;
            font-weight: 500;
            cursor: pointer;
            border: none;
            background: #f9fafb;
            color: #6b7280;
            transition: all 0.15s ease;
        }

        .lang-btn:first-child {
            border-right: 1px solid #d1d5db;
        }

        .lang-btn.active {
            background: #2563eb;
            color: #ffffff;
        }

        .lang-btn:hover:not(.active) {
            background: #e5e7eb;
        }

        /* Article */
        article {
            padding: 48px 0;
        }

        .article-meta {
            margin-bottom: 32px;
            padding-bottom: 24px;
            border-bottom: 1px solid #e5e7eb;
        }

        .article-date {
            font-size: 0.85rem;
            color: #9ca3af;
            margin-bottom: 8px;
        }

        h1 {
            font-size: 2rem;
            font-weight: 700;
            color: #111827;
            line-height: 1.3;
            letter-spacing: -0.5px;
        }

        h2 {
            font-size: 1.25rem;
            font-weight: 600;
            color: #111827;
            margin-top: 40px;
            margin-bottom: 16px;
        }

        h2::before {
            content: '';
            display: inline-block;
            width: 3px;
            height: 20px;
            background: #2563eb;
            margin-right: 12px;
            vertical-align: middle;
            border-radius: 2px;
        }

        h3 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #1f2937;
            margin-top: 28px;
            margin-bottom: 10px;
        }

        p {
            margin-bottom: 14px;
            color: #4b5563;
        }

        a {
            color: #2563eb;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }

        ul {
            margin-bottom: 14px;
            padding-left: 24px;
        }

        ul li {
            margin-bottom: 6px;
            color: #4b5563;
        }

        ol {
            margin-bottom: 14px;
            padding-left: 24px;
        }

        ol li {
            margin-bottom: 8px;
            color: #4b5563;
        }

        ol li strong {
            color: #1f2937;
        }

        code {
            font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
            font-size: 0.88rem;
            background: #f3f4f6;
            padding: 2px 6px;
            border-radius: 4px;
            color: #2563eb;
        }

        /* Table */
        .table-wrapper {
            overflow-x: auto;
            margin: 20px 0;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.92rem;
        }

        th {
            text-align: left;
            padding: 12px 16px;
            background: #f9fafb;
            border-bottom: 2px solid #e5e7eb;
            color: #111827;
            font-weight: 600;
        }

        td {
            padding: 10px 16px;
            border-bottom: 1px solid #e5e7eb;
            color: #4b5563;
        }

        tr:last-child td {
            border-bottom: none;
        }

        /* Back link */
        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            margin-top: 48px;
            padding: 10px 20px;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            background: #f3f4f6;
            color: #374151;
            border: 1px solid #d1d5db;
            text-decoration: none;
            transition: all 0.15s ease;
        }

        .back-link:hover {
            background: #e5e7eb;
            text-decoration: none;
        }

        /* Footer */
        footer {
            padding: 32px 0;
            text-align: center;
            color: #9ca3af;
            font-size: 0.85rem;
            border-top: 1px solid #e5e7eb;
        }

        /* Responsive */
        @media (max-width: 600px) {
            header {
                padding: 24px 0;
            }

            .logo {
                font-size: 1.3rem;
            }

            h1 {
                font-size: 1.5rem;
            }

            h2 {
                font-size: 1.1rem;
            }

            article {
                padding: 32px 0;
            }

            th, td {
                padding: 8px 10px;
                font-size: 0.85rem;
            }
        }

        /* --- uit artikel-intro (blog 1) --- */
        .article-intro {
            font-size: 1.05rem;
            color: #4b5563;
            line-height: 1.8;
            margin-bottom: 32px;
            padding-bottom: 24px;
            border-bottom: 1px solid #e5e7eb;
        }