* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        a { color: #0056b3; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #ff6b35; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; padding-right: 15px; padding-left: 15px; margin-right: auto; margin-left: auto; }
        header {
            background: linear-gradient(90deg, #1e3c72 0%, #2a5298 100%);
            color: white;
            padding: 1.5rem 0;
            border-bottom: 5px solid #ff6b35;
            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: 2.5rem;
            font-weight: 900;
            color: #ffdd40;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
            font-style: italic;
        }
        .my-logo:hover { color: #ff6b35; text-decoration: none; }
        .breadcrumb {
            background: #2a5298;
            padding: 0.8rem;
            border-radius: 5px;
            margin-top: 10px;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #ffdd40; }
        .breadcrumb a:hover { color: white; }
        nav { display: flex; align-items: center; }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-links a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .nav-links a:hover {
            background: #ff6b35;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #1e3c72;
                padding: 1rem;
                border-top: 2px solid #ff6b35;
            }
            .nav-links.active { display: flex; }
        }
        main {
            background: white;
            padding: 2.5rem;
            margin: 2rem 0;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }
        h1 {
            color: #1e3c72;
            font-size: 3rem;
            margin-bottom: 1.5rem;
            border-bottom: 4px solid #ff6b35;
            padding-bottom: 0.5rem;
            text-align: center;
        }
        h2 { color: #2a5298; font-size: 2.2rem; margin-top: 2.5rem; margin-bottom: 1rem; }
        h3 { color: #0056b3; font-size: 1.8rem; margin-top: 2rem; margin-bottom: 0.8rem; }
        h4 { color: #ff6b35; font-size: 1.4rem; margin-top: 1.5rem; margin-bottom: 0.6rem; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .highlight { background: #fffacd; padding: 1rem; border-left: 5px solid #ffdd40; margin: 1.5rem 0; }
        .emoji { font-size: 1.2em; margin-right: 5px; }
        .article-img {
            float: right;
            margin: 0 0 1.5rem 1.5rem;
            border-radius: 10px;
            border: 3px solid #2a5298;
            max-width: 45%;
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        @media (max-width: 768px) {
            .article-img { float: none; margin: 1.5rem auto; max-width: 100%; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            main { padding: 1.5rem; }
        }
        .functional-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
            padding: 2rem;
            background: #f8f9fa;
            border-radius: 10px;
            border: 2px dashed #c3cfe2;
        }
        .function-box {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
        }
        .function-box h3 { margin-top: 0; }
        form { display: flex; flex-direction: column; gap: 1rem; }
        input, textarea, select {
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-size: 1rem;
        }
        button {
            background: linear-gradient(90deg, #ff6b35, #ff8e53);
            color: white;
            border: none;
            padding: 1rem;
            border-radius: 5px;
            font-weight: bold;
            cursor: pointer;
            transition: transform 0.3s;
        }
        button:hover { transform: scale(1.03); background: linear-gradient(90deg, #ff8e53, #ff6b35); }
        footer {
            background: #1e3c72;
            color: white;
            padding: 2.5rem 0;
            text-align: center;
            border-top: 5px solid #ff6b35;
            margin-top: 3rem;
        }
        friend-link {
            display: block;
            margin: 1.5rem 0;
            font-size: 1.1rem;
        }
        friend-link a {
            color: #ffdd40;
            font-weight: bold;
            margin: 0 10px;
        }
        friend-link a:hover { color: #ff6b35; }
        .copyright {
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #c3cfe2;
            border-top: 1px solid #2a5298;
            padding-top: 1rem;
        }
        .last-updated {
            text-align: right;
            font-style: italic;
            color: #666;
            margin-bottom: 2rem;
            font-size: 0.95rem;
        }
        .keyword { font-weight: bold; color: #1e3c72; }
        .link-list { list-style: none; padding-left: 1.5rem; }
        .link-list li { margin-bottom: 0.5rem; }
        .rating-stars { color: #ffdd40; font-size: 1.5rem; }