* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: #2c3e50;
            color: white;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-family: 'Comic Sans MS', cursive, sans-serif;
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(45deg, #FF6B6B, #4ECDC4);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            transition: transform 0.3s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .my-logo a {
            text-decoration: none;
            color: inherit;
        }
        .main-nav {
            display: flex;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 25px;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            padding: 8px 15px;
            border-radius: 20px;
            transition: all 0.3s ease;
            font-weight: 500;
        }
        .nav-links a:hover {
            background: #3498db;
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            background: #34495e;
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin-left: 10px;
            color: #bdc3c7;
        }
        .breadcrumb a {
            color: #ecf0f1;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            color: #3498db;
            text-decoration: underline;
        }
        main {
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            padding: 40px;
            margin: 30px auto;
            position: relative;
            overflow: hidden;
        }
        main::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: linear-gradient(90deg, #FF6B6B, #4ECDC4, #45B7D1);
        }
        h1 {
            font-size: 3.2rem;
            color: #2c3e50;
            margin-bottom: 20px;
            line-height: 1.2;
            text-align: center;
            position: relative;
            padding-bottom: 20px;
        }
        h1::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 150px;
            height: 4px;
            background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
            border-radius: 2px;
        }
        h2 {
            font-size: 2.2rem;
            color: #3498db;
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #ecf0f1;
        }
        h3 {
            font-size: 1.8rem;
            color: #2c3e50;
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.4rem;
            color: #7f8c8d;
            margin: 25px 0 12px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
            font-size: 1.1rem;
            color: #444;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: #2c3e50;
            background: #f8f9fa;
            padding: 20px;
            border-left: 5px solid #3498db;
            border-radius: 0 10px 10px 0;
            margin: 30px 0;
        }
        .highlight {
            background: linear-gradient(120deg, #a8edea 0%, #fed6e3 100%);
            padding: 15px 20px;
            border-radius: 10px;
            margin: 25px 0;
            border-left: 5px solid #FF6B6B;
        }
        .content-img {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 12px;
            margin: 30px auto;
            display: block;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            transition: transform 0.4s ease;
        }
        .content-img:hover {
            transform: scale(1.02);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #7f8c8d;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .content-link {
            color: #e74c3c;
            font-weight: 600;
            text-decoration: none;
            border-bottom: 2px dotted #e74c3c;
            transition: all 0.3s ease;
        }
        .content-link:hover {
            color: #c0392b;
            border-bottom: 2px solid #c0392b;
            background: #fff5f5;
            padding: 2px 5px;
            border-radius: 4px;
        }
        .function-section {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 30px;
            margin: 40px 0;
            border: 2px solid #e9ecef;
        }
        .function-section h3 {
            color: #2c3e50;
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .function-section h3 i {
            color: #3498db;
        }
        .function-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 25px;
        }
        .function-card {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s ease;
        }
        .function-card:hover {
            transform: translateY(-5px);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        input, textarea, select {
            padding: 12px 15px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        button {
            background: linear-gradient(45deg, #3498db, #2ecc71);
            color: white;
            border: none;
            padding: 14px 25px;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 7px 15px rgba(52, 152, 219, 0.3);
        }
        footer {
            background: #2c3e50;
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: #ecf0f1;
            font-size: 1.4rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #3498db;
        }
        friend-link {
            display: block;
            margin: 12px 0;
        }
        friend-link a {
            color: #bdc3c7;
            text-decoration: none;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        friend-link a:hover {
            color: #3498db;
            transform: translateX(5px);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        .last-updated {
            color: #3498db;
            font-weight: 600;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #2c3e50;
                padding: 20px;
                box-shadow: 0 10px 20px rgba(0,0,0,0.2);
                border-top: 2px solid #3498db;
            }
            .nav-links.active {
                display: flex;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 1.9rem;
            }
            main {
                padding: 25px;
            }
            .function-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .my-logo {
                font-size: 2rem;
            }
            h1 {
                font-size: 2rem;
            }
            .container {
                padding: 0 15px;
            }
        }