* {
            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: #2d3748;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-decoration: none;
            color: #ffeb3b;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
            transition: transform 0.3s ease, color 0.3s ease;
        }
        .my-logo:hover {
            transform: scale(1.05);
            color: #ffff72;
        }
        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: 20px;
            transition: all 0.3s ease;
        }
        nav a:hover, nav a.active {
            background-color: #ffeb3b;
            color: #1a237e;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 20px;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: #3949ab;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 2rem 0;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            margin-bottom: 3rem;
            overflow: hidden;
        }
        article {
            padding: 0 2rem;
        }
        h1 {
            font-size: 3.2rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            text-align: center;
            line-height: 1.2;
            border-bottom: 4px solid #ffeb3b;
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2.4rem;
            color: #283593;
            margin: 2.5rem 0 1.2rem;
            padding-left: 10px;
            border-left: 6px solid #3949ab;
        }
        h3 {
            font-size: 1.8rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 1.5rem;
            border-left: 5px solid #ffeb3b;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 5px;
        }
        strong {
            color: #1a237e;
        }
        a.content-link {
            color: #1e88e5;
            text-decoration: none;
            font-weight: 600;
            border-bottom: 1px dotted #1e88e5;
            transition: color 0.3s;
        }
        a.content-link:hover {
            color: #0d47a1;
            border-bottom-style: solid;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
            display: block;
            margin: 2rem auto;
            transition: transform 0.5s ease;
        }
        img:hover {
            transform: scale(1.02);
        }
        .figure-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: -1.5rem;
            margin-bottom: 2rem;
        }
        .last-updated {
            text-align: right;
            font-size: 0.9rem;
            color: #777;
            margin-bottom: 2rem;
            padding-right: 1rem;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 3rem 0;
            padding: 2rem;
            background: #f3f4f9;
            border-radius: 12px;
        }
        .feature-box {
            background: white;
            padding: 1.8rem;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .feature-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        .feature-box h3 {
            color: #1a237e;
            margin-top: 0;
        }
        form input, form textarea, form select {
            width: 100%;
            padding: 12px;
            margin: 10px 0;
            border: 2px solid #c5cae9;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        form input:focus, form textarea:focus, form select:focus {
            border-color: #3949ab;
            outline: none;
        }
        button, .btn {
            background: linear-gradient(90deg, #3949ab, #1a237e);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 30px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            background: linear-gradient(90deg, #1a237e, #3949ab);
            box-shadow: 0 4px 12px rgba(26, 35, 126, 0.3);
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin: 10px 0;
        }
        .rating-stars i {
            color: #ffc107;
            cursor: pointer;
            font-size: 1.5rem;
            transition: color 0.2s;
        }
        .rating-stars i:hover {
            color: #ff9800;
        }
        footer {
            background: #1a237e;
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer-section h3 {
            color: #ffeb3b;
            margin-bottom: 1.5rem;
            font-size: 1.5rem;
        }
        .friend-links {
            list-style: none;
        }
        .friend-links li {
            margin-bottom: 0.8rem;
        }
        .friend-links a {
            color: #bbdefb;
            text-decoration: none;
            transition: color 0.3s;
        }
        .friend-links a:hover {
            color: #ffeb3b;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #c5cae9;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.5rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.6rem; }
            .header-content {
                flex-wrap: wrap;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: #283593;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                border-radius: 0 0 12px 12px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.2);
            }
            nav ul.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .interactive-section {
                grid-template-columns: 1fr;
                padding: 1.5rem;
            }
            article {
                padding: 0 1rem;
            }
        }