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

        body {
            font-family: 'Arial', sans-serif;
            line-height: 1.6;
            color: #333;
            background: #f9f9f9;
        }

        /* ── Header ── */
        header {
            background: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        nav {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 64px;
        }

        .logo {
            display: flex;
            align-items: center;
            text-decoration: none;
        }

        .logo img {
            height: 36px;
            width: auto;
            display: block;
        }

        .nav-back {
            font-size: 14px;
            color: #4CAF50;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: gap .2s;
        }
        .nav-back:hover { gap: 10px; }

        /* ── Hero ── */
        .hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: #fff;
            padding: 60px 20px;
            text-align: center;
        }
        .hero h1 { font-size: 36px; margin-bottom: 12px; }
        .hero p  { font-size: 15px; opacity: .85; }
        .hero .meta { margin-top: 16px; font-size: 13px; opacity: .7; }

        /* ── Main Content ── */
        .container {
            max-width: 860px;
            margin: 0 auto;
            padding: 48px 20px 80px;
        }

        /* Table of Contents */
        .toc {
            background: #fff;
            border: 1px solid #e8e8e8;
            border-radius: 12px;
            padding: 24px 28px;
            margin-bottom: 40px;
        }
        .toc h2 { font-size: 15px; color: #555; margin-bottom: 14px; font-weight: 600; }
        .toc ol { padding-left: 20px; }
        .toc li { margin-bottom: 8px; }
        .toc a  { color: #4CAF50; text-decoration: none; font-size: 14px; }
        .toc a:hover { text-decoration: underline; }

        /* Sections */
        .section {
            background: #fff;
            border-radius: 12px;
            padding: 32px 36px;
            margin-bottom: 20px;
            border: 1px solid #f0f0f0;
            scroll-margin-top: 80px;
        }

        .section-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 28px; height: 28px;
            background: linear-gradient(135deg, #4CAF50, #2e7d32);
            color: #fff;
            border-radius: 50%;
            font-size: 13px;
            font-weight: 700;
            margin-right: 10px;
            flex-shrink: 0;
        }

        .section h2 {
            font-size: 18px;
            color: #222;
            margin-bottom: 18px;
            display: flex;
            align-items: center;
            padding-bottom: 14px;
            border-bottom: 2px solid #f0f0f0;
        }

        .section p {
            font-size: 14px;
            color: #555;
            line-height: 1.8;
            margin-bottom: 14px;
        }
        .section p:last-child { margin-bottom: 0; }

        .section ul, .section ol {
            padding-left: 20px;
            margin-bottom: 14px;
        }
        .section li {
            font-size: 14px;
            color: #555;
            line-height: 1.8;
            margin-bottom: 6px;
        }

        /* Highlight blocks */
        .highlight {
            background: #e8f5e9;
            border-left: 4px solid #4CAF50;
            border-radius: 0 8px 8px 0;
            padding: 14px 18px;
            margin: 16px 0;
            font-size: 14px;
            color: #2e7d32;
            line-height: 1.7;
        }

        .warning {
            background: #fff8e1;
            border-left: 4px solid #ffc107;
            border-radius: 0 8px 8px 0;
            padding: 14px 18px;
            margin: 16px 0;
            font-size: 14px;
            color: #7a5c00;
            line-height: 1.7;
        }

        /* Data table */
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 16px 0;
            font-size: 14px;
        }
        .data-table th {
            background: #f5f5f5;
            padding: 10px 14px;
            text-align: left;
            font-weight: 600;
            color: #444;
            border-bottom: 2px solid #e8e8e8;
        }
        .data-table td {
            padding: 10px 14px;
            border-bottom: 1px solid #f0f0f0;
            color: #555;
            vertical-align: top;
        }
        .data-table tr:last-child td { border-bottom: none; }
        .data-table tr:hover td { background: #fafafa; }

        /* Contact card */
        .contact-card {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 12px;
            padding: 28px 32px;
            color: #fff;
            margin-top: 8px;
        }
        .contact-card h3 { font-size: 16px; margin-bottom: 14px; }
        .contact-card a  { color: #fff; }
        .contact-info { display: flex; flex-direction: column; gap: 8px; }
        .contact-row  { display: flex; align-items: center; gap: 10px; font-size: 14px; opacity: .9; }
        .contact-icon { font-size: 16px; }

        /* Language switcher */
        .lang-switch {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,.15);
            border: 1px solid rgba(255,255,255,.3);
            border-radius: 20px;
            padding: 6px 14px;
            font-size: 13px;
            text-decoration: none;
            color: #fff;
            margin-top: 16px;
            transition: background .2s;
        }
        .lang-switch:hover { background: rgba(255,255,255,.25); }

        /* ── Footer ── */
        footer {
            background: #222;
            color: #aaa;
            text-align: center;
            padding: 24px 20px;
            font-size: 13px;
        }
        footer a { color: #888; text-decoration: none; }
        footer a:hover { color: #fff; }