* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a { color: #2c5aa0; text-decoration: none; transition: color 0.3s ease; }
        a:hover { color: #1a3d7a; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .visually-hidden {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }
        header {
            background: linear-gradient(135deg, #1a3d7a, #2c5aa0);
            color: white;
            padding: 15px 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            letter-spacing: 1px;
            color: white;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover { color: #ffcc00; text-decoration: none; }
        .my-logo i { font-size: 2.5rem; }
        nav ul {
            display: flex;
            list-style: none;
            gap: 25px;
            flex-wrap: wrap;
        }
        nav a {
            color: white;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
            display: block;
        }
        nav a:hover, nav a:focus {
            background: rgba(255,255,255,0.15);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
            padding: 5px;
        }
        .breadcrumb {
            background: #e9ecef;
            padding: 12px 20px;
            border-radius: 8px;
            margin: 20px auto;
            font-size: 0.95rem;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #1a3d7a; }
        main { padding: 30px 0; background: white; }
        article { max-width: 900px; margin: 0 auto; padding: 0 20px; }
        h1 {
            font-size: 3rem;
            color: #1a3d7a;
            margin-bottom: 25px;
            line-height: 1.2;
            text-align: center;
            border-bottom: 4px solid #ffcc00;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2.2rem;
            color: #2c5aa0;
            margin: 40px 0 20px;
            padding-top: 10px;
            border-top: 2px solid #eee;
        }
        h3 {
            font-size: 1.8rem;
            color: #3a6bc5;
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
            margin: 25px 0 12px;
        }
        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            color: #444;
            font-weight: 500;
            margin-bottom: 30px;
            line-height: 1.8;
        }
        .highlight {
            background: #fff9e6;
            border-left: 5px solid #ffcc00;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .image-wrapper {
            margin: 30px auto;
            text-align: center;
            max-width: 800px;
        }
        .image-wrapper img {
            border-radius: 12px;
            box-shadow: 0 6px 15px rgba(0,0,0,0.1);
            border: 3px solid #ddd;
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .link-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 15px;
            margin: 30px 0;
            padding: 20px;
            background: #f1f8ff;
            border-radius: 10px;
        }
        .link-list a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px;
            background: white;
            border-radius: 6px;
            border: 1px solid #cce0ff;
        }
        .link-list a:hover {
            background: #e6f2ff;
            border-color: #2c5aa0;
        }
        .function-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 50px 0;
        }
        .function-card {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 25px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border: 1px solid #dee2e6;
        }
        .function-card h3 { margin-top: 0; color: #1a3d7a; }
        form { display: flex; flex-direction: column; gap: 15px; }
        input, textarea, select {
            padding: 12px 15px;
            border: 2px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #2c5aa0;
        }
        button {
            padding: 14px 20px;
            background: linear-gradient(to right, #2c5aa0, #1a3d7a);
            color: white;
            border: none;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(44, 90, 160, 0.3);
        }
        .rating {
            display: flex;
            gap: 10px;
            justify-content: center;
            margin: 15px 0;
        }
        .rating input { display: none; }
        .rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating label:hover,
        .rating input:checked ~ label { color: #ffcc00; }
        footer {
            background: #1a1a2e;
            color: #ddd;
            padding: 40px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 30px;
        }
        .footer-section h3 {
            color: #ffcc00;
            font-size: 1.5rem;
            margin-bottom: 20px;
            border-bottom: 2px solid #2c5aa0;
            padding-bottom: 8px;
        }
        friend-link {
            display: block;
            margin: 10px 0;
            padding: 8px 12px;
            background: #2c5aa0;
            border-radius: 5px;
            color: white;
            text-decoration: none;
            transition: background 0.3s;
        }
        friend-link:hover {
            background: #ffcc00;
            color: #1a1a2e;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #333;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .header-container { flex-direction: column; align-items: flex-start; }
            nav ul {
                flex-direction: column;
                width: 100%;
                display: none;
                margin-top: 15px;
                gap: 10px;
            }
            nav ul.show { display: flex; }
            .hamburger { display: block; align-self: flex-end; margin-top: -50px; }
            h1 { font-size: 2.3rem; }
            h2 { font-size: 1.9rem; }
            h3 { font-size: 1.5rem; }
            .lead { font-size: 1.1rem; }
            .function-grid { grid-template-columns: 1fr; }
            .link-list { grid-template-columns: 1fr; }
        }
        @media print {
            header, nav, .function-grid, footer { display: none; }
            body { background: white; }
            h1 { color: black; }
        }