* {
            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: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(to right, #0033a0, #0066b3, #0099cc);
            color: white;
            padding: 1.2rem 0;
            box-shadow: 0 4px 12px rgba(0, 51, 160, 0.2);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
            text-transform: uppercase;
            letter-spacing: 1px;
            transition: transform 0.3s ease;
        }
        .logo a:hover {
            transform: scale(1.05);
        }
        .logo i {
            color: #FFD700;
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
            position: relative;
        }
        nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 50%;
            width: 0;
            height: 3px;
            background: #FFD700;
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        nav a:hover::after {
            width: 80%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #f0f8ff;
            border-bottom: 1px solid #ddeeff;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 0.5rem;
            color: #666;
        }
        .breadcrumb a {
            color: #0066b3;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 3rem 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: #0033a0;
            border-bottom: 2px solid #FFD700;
            padding-bottom: 0.5rem;
            margin-bottom: 1.5rem;
        }
        h1 {
            color: #0033a0;
            font-size: 2.8rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #FFD700;
            padding-bottom: 0.5rem;
        }
        h2 {
            color: #0066b3;
            font-size: 2rem;
            margin: 2.5rem 0 1.2rem;
            padding-top: 0.5rem;
        }
        h3 {
            color: #0099cc;
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        h4 {
            color: #333;
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        strong {
            color: #0033a0;
            font-weight: 700;
        }
        em {
            color: #666;
            font-style: italic;
        }
        .content a {
            color: #0066b3;
            text-decoration: none;
            border-bottom: 1px dotted #0066b3;
            transition: all 0.2s ease;
        }
        .content a:hover {
            color: #0033a0;
            border-bottom: 2px solid #0033a0;
        }
        ul, ol {
            margin: 1rem 0 1.5rem 1.5rem;
        }
        li {
            margin-bottom: 0.7rem;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
            transition: transform 0.5s ease;
        }
        .article-image:hover {
            transform: scale(1.01);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .feature-box {
            background: linear-gradient(to right, #f8fdff, #eef7ff);
            border-left: 5px solid #0066b3;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .interactive-form {
            background: #f9f9f9;
            padding: 1.8rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            border: 1px solid #e1e1e1;
        }
        .interactive-form h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #0066b3;
            box-shadow: 0 0 0 3px rgba(0, 102, 179, 0.1);
        }
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        button {
            background: linear-gradient(to right, #0066b3, #0099cc);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        button:hover {
            background: linear-gradient(to right, #0033a0, #0066b3);
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0, 51, 160, 0.2);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin: 0.5rem 0;
        }
        .star-rating .star:hover,
        .star-rating .star:hover ~ .star {
            color: #ddd;
        }
        .star-rating .star.active {
            color: #FFD700;
        }
        footer {
            background: #002244;
            color: #e6f2ff;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h4 {
            color: #FFD700;
            margin-bottom: 1.2rem;
            font-size: 1.3rem;
        }
        .footer-section ul {
            list-style: none;
            margin: 0;
        }
        .footer-section li {
            margin-bottom: 0.8rem;
        }
        .footer-section a {
            color: #b3d9ff;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer-section a:hover {
            color: #FFD700;
            text-decoration: underline;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.1);
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }
        friend-link h5 {
            color: #FFD700;
            margin-bottom: 1rem;
        }
        friend-link a {
            display: inline-block;
            background: rgba(255, 255, 255, 0.15);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            margin-right: 0.8rem;
            margin-bottom: 0.8rem;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        friend-link a:hover {
            background: rgba(255, 215, 0, 0.3);
            transform: translateY(-2px);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            color: #99ccff;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            nav {
                width: 100%;
                order: 3;
                margin-top: 1rem;
                display: none;
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                gap: 0.5rem;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .content {
                padding: 1.5rem;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 15px;
            }
            h1 {
                font-size: 1.9rem;
            }
            .logo a {
                font-size: 1.5rem;
            }
        }
        .text-center { text-align: center; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .highlight { background-color: #fffacd; padding: 2px 6px; border-radius: 3px; }