* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary-dark: #0d1b2a;
            --primary-accent: #1b4965;
            --secondary-accent: #5fa8d3;
            --highlight: #bee9e8;
            --text-light: #f8f9fa;
            --text-gray: #adb5bd;
            --bg-light: #edf2f4;
            --border-color: #4a6fa5;
            --success: #4caf50;
            --warning: #ff9800;
            --danger: #e63946;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        body {
            background-color: var(--primary-dark);
            color: var(--text-light);
            line-height: 1.7;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--secondary-accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--highlight);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: rgba(13, 27, 42, 0.95);
            border-bottom: 2px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            backdrop-filter: blur(10px);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--highlight);
            text-transform: uppercase;
            letter-spacing: 2px;
            background: linear-gradient(90deg, var(--secondary-accent), var(--highlight));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
        }
        .my-logo:hover {
            transform: scale(1.03);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-desktop {
            display: flex;
            list-style: none;
        }
        .nav-desktop li {
            margin-left: 30px;
        }
        .nav-desktop a {
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: 5px;
        }
        .nav-desktop a:hover {
            background-color: rgba(91, 168, 211, 0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--highlight);
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: var(--primary-accent);
            list-style: none;
            box-shadow: var(--shadow);
            border-top: 1px solid var(--border-color);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile li {
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .nav-mobile a {
            display: block;
            padding: 18px 20px;
            font-size: 1.2rem;
        }
        .breadcrumb {
            padding: 15px 0;
            background-color: rgba(27, 73, 101, 0.4);
            font-size: 0.95rem;
            margin-bottom: 30px;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 12px;
            color: var(--text-gray);
        }
        main {
            flex: 1;
            padding: 30px 0 60px;
        }
        article {
            background-color: rgba(27, 73, 101, 0.15);
            border-radius: 12px;
            padding: 40px;
            margin-bottom: 40px;
            border: 1px solid var(--border-color);
        }
        h1 {
            font-size: 3.2rem;
            margin-bottom: 25px;
            color: var(--highlight);
            line-height: 1.2;
            text-align: center;
            border-bottom: 3px solid var(--secondary-accent);
            padding-bottom: 20px;
        }
        h2 {
            font-size: 2.4rem;
            margin: 50px 0 25px;
            color: var(--secondary-accent);
            padding-left: 15px;
            border-left: 6px solid var(--highlight);
        }
        h3 {
            font-size: 1.8rem;
            margin: 35px 0 18px;
            color: var(--text-light);
        }
        h4 {
            font-size: 1.4rem;
            margin: 25px 0 15px;
            color: var(--text-gray);
        }
        p {
            margin-bottom: 22px;
            font-size: 1.15rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.3rem;
            background: rgba(190, 233, 232, 0.08);
            padding: 25px;
            border-radius: 10px;
            margin-bottom: 35px;
            border-left: 5px solid var(--secondary-accent);
        }
        .highlight-box {
            background: linear-gradient(135deg, rgba(27, 73, 101, 0.7), rgba(13, 27, 42, 0.9));
            border: 1px solid var(--secondary-accent);
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
            box-shadow: var(--shadow);
        }
        .feature-img {
            width: 80%;
            margin: 40px auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
            border: 3px solid var(--border-color);
        }
        .feature-img img {
            transition: transform 0.5s ease;
            width: 100%;
        }
        .feature-img:hover img {
            transform: scale(1.03);
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: var(--text-gray);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 50px 0;
        }
        .card {
            background: var(--primary-accent);
            padding: 30px;
            border-radius: 12px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow);
            border-color: var(--highlight);
        }
        .card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        .card h3 i {
            color: var(--highlight);
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin-top: 20px;
        }
        input, textarea, select {
            padding: 15px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            background-color: rgba(255, 255, 255, 0.1);
            color: var(--text-light);
            font-size: 1rem;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--highlight);
            box-shadow: 0 0 0 3px rgba(190, 233, 232, 0.3);
        }
        button, .btn {
            background: linear-gradient(to right, var(--primary-accent), var(--secondary-accent));
            color: white;
            border: none;
            padding: 16px 30px;
            border-radius: 8px;
            font-weight: bold;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            display: inline-block;
        }
        button:hover, .btn:hover {
            background: linear-gradient(to right, var(--secondary-accent), var(--highlight));
            transform: scale(1.05);
            text-decoration: none;
        }
        .rating {
            display: flex;
            gap: 10px;
            margin: 15px 0;
            flex-wrap: wrap;
        }
        .star {
            font-size: 2rem;
            color: var(--text-gray);
            cursor: pointer;
            transition: color 0.2s;
        }
        .star.active, .star:hover {
            color: var(--warning);
        }
        .update-info {
            text-align: right;
            font-size: 0.9rem;
            color: var(--text-gray);
            margin-top: 40px;
            padding-top: 20px;
            border-top: 1px dashed var(--border-color);
        }
        footer {
            background-color: var(--primary-accent);
            padding: 50px 0 30px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 900;
            color: var(--highlight);
            margin-bottom: 20px;
        }
        .footer-links h4 {
            color: var(--highlight);
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        friend-link {
            display: block;
            padding: 12px 15px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 6px;
            margin-bottom: 10px;
            border-left: 4px solid transparent;
            transition: var(--transition);
        }
        friend-link:hover {
            background: rgba(190, 233, 232, 0.1);
            border-left-color: var(--highlight);
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid var(--border-color);
            color: var(--text-gray);
            font-size: 0.95rem;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.8rem; }
            h2 { font-size: 2.1rem; }
            article { padding: 30px; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-desktop { display: none; }
            h1 { font-size: 2.3rem; }
            h2 { font-size: 1.9rem; }
            .header-container, .container { padding-left: 15px; padding-right: 15px; }
            article { padding: 25px 20px; }
            .interactive-section { grid-template-columns: 1fr; }
            .feature-img { width: 100%; }
        }
        @media (max-width: 576px) {
            h1 { font-size: 1.9rem; }
            h2 { font-size: 1.6rem; }
            .intro { font-size: 1.1rem; padding: 20px; }
            .card { padding: 25px 20px; }
        }