:root {
            --primary-blue: #1a365d;
            --accent-red: #c53030;
            --accent-amber: #d69e2e;
            --light-gray: #f7fafc;
            --medium-gray: #e2e8f0;
            --dark-gray: #4a5568;
            --text-color: #2d3748;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
        }
        * {
            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: var(--text-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-red);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-blue);
            text-transform: uppercase;
            letter-spacing: -1px;
        }
        .my-logo span {
            color: var(--accent-red);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        nav a {
            font-weight: 600;
            padding: 5px 0;
            border-bottom: 2px solid transparent;
        }
        nav a:hover, nav a.active {
            border-bottom-color: var(--accent-red);
        }
        .hamburger {
            display: none;
            cursor: pointer;
            font-size: 1.5rem;
            color: var(--primary-blue);
        }
        .breadcrumb {
            background-color: var(--light-gray);
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--dark-gray);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .breadcrumb span {
            color: var(--dark-gray);
            margin: 0 8px;
        }
        main {
            padding: 40px 0;
        }
        article {
            background: white;
            border-radius: 8px;
            padding: 40px;
            box-shadow: var(--shadow);
        }
        h1 {
            font-size: 2.8rem;
            color: var(--primary-blue);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid var(--accent-red);
            padding-left: 20px;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-blue);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--medium-gray);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--dark-gray);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--accent-red);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--dark-gray);
            background-color: var(--light-gray);
            padding: 20px;
            border-radius: 8px;
            border-left: 4px solid var(--accent-amber);
            margin-bottom: 2.5rem;
        }
        .highlight {
            background-color: #fffaf0;
            padding: 25px;
            border-radius: 8px;
            border: 1px solid var(--accent-amber);
            margin: 2rem 0;
        }
        .highlight h3 {
            margin-top: 0;
            color: var(--accent-amber);
        }
        .image-container {
            margin: 2.5rem auto;
            text-align: center;
        }
        .image-container img {
            border-radius: 8px;
            box-shadow: var(--shadow);
            max-height: 500px;
            object-fit: cover;
            width: 100%;
        }
        .image-caption {
            font-style: italic;
            color: var(--dark-gray);
            margin-top: 10px;
            font-size: 0.9rem;
        }
        ul, ol {
            margin-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.5rem;
        }
        blockquote {
            border-left: 4px solid var(--primary-blue);
            padding-left: 20px;
            margin: 2rem 0;
            font-style: italic;
            color: var(--dark-gray);
        }
        .interactive-section {
            background-color: var(--light-gray);
            padding: 30px;
            border-radius: 8px;
            margin: 3rem 0;
        }
        .interactive-section h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px;
            border: 1px solid var(--medium-gray);
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(26, 54, 93, 0.1);
        }
        button {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        button:hover {
            background-color: var(--accent-red);
            transform: translateY(-2px);
        }
        .rating {
            display: flex;
            gap: 5px;
            margin: 1rem 0;
        }
        .rating i {
            color: var(--medium-gray);
            cursor: pointer;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        .rating i:hover, .rating i.active {
            color: var(--accent-amber);
        }
        .update-time {
            text-align: right;
            font-size: 0.9rem;
            color: var(--dark-gray);
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 1px solid var(--medium-gray);
        }
        footer {
            background-color: var(--primary-blue);
            color: white;
            padding: 50px 0 20px;
            margin-top: 50px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
        }
        .footer-links ul {
            list-style: none;
            margin-left: 0;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: var(--medium-gray);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.1);
            padding: 15px;
            border-radius: 6px;
            margin-top: 10px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: var(--medium-gray);
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            article { padding: 30px; }
        }
        @media (max-width: 768px) {
            .header-container { flex-wrap: wrap; }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: white;
                position: absolute;
                top: 100%;
                left: 0;
                box-shadow: var(--shadow);
                padding: 20px;
                gap: 1rem;
            }
            nav ul.active { display: flex; }
            .hamburger { display: block; }
            .header-container { padding: 15px; }
            article { padding: 20px; }
            h1 { font-size: 2rem; }
            h2 { font-size: 1.6rem; }
            .interactive-section { padding: 20px; }
        }
        @media (max-width: 480px) {
            .my-logo { font-size: 1.5rem; }
            h1 { font-size: 1.8rem; }
            .lead { font-size: 1.1rem; padding: 15px; }
        }
        .text-bold { font-weight: 700; }
        .text-italic { font-style: italic; }
        .text-center { text-align: center; }
        .mb-3 { margin-bottom: 3rem; }
        .mt-3 { margin-top: 3rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }