* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a237e;
            --secondary: #d32f2f;
            --accent: #ffc107;
            --light: #f5f5f5;
            --dark: #212121;
            --gray: #757575;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: var(--dark);
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            min-height: 100vh;
        }
        header {
            background: var(--primary);
            color: white;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
            padding: 1rem 2rem;
            flex-wrap: wrap;
        }
        .logo a {
            color: white;
            text-decoration: none;
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: 1px;
            transition: color 0.3s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo a:hover {
            color: var(--accent);
        }
        .logo i {
            color: var(--accent);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        nav ul li a:hover {
            background: var(--secondary);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            background: var(--light);
            padding: 1rem 2rem;
            max-width: 1400px;
            margin: 0 auto;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.3s;
        }
        .breadcrumb a:hover {
            color: var(--secondary);
        }
        main {
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }
        article {
            background: white;
            border-radius: 12px;
            padding: 3rem;
            box-shadow: var(--shadow);
        }
        h1, h2, h3, h4 {
            color: var(--primary);
            margin-bottom: 1.5rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 3.5rem;
            border-bottom: 4px solid var(--accent);
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2.5rem;
            margin-top: 3rem;
            padding-left: 1rem;
            border-left: 5px solid var(--secondary);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--secondary);
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            font-size: 1.1rem;
        }
        strong {
            color: var(--primary);
            font-weight: 700;
        }
        em {
            color: var(--gray);
            font-style: italic;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            margin: 2rem auto;
            display: block;
            box-shadow: var(--shadow);
            transition: transform 0.5s;
        }
        img:hover {
            transform: scale(1.01);
        }
        .float-left {
            float: left;
            margin: 0 2rem 1rem 0;
            max-width: 50%;
        }
        .float-right {
            float: right;
            margin: 0 0 1rem 2rem;
            max-width: 50%;
        }
        .clearfix::after {
            content: "";
            display: table;
            clear: both;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e3f2fd, #f3e5f5);
            border-left: 6px solid var(--accent);
            padding: 2rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-card {
            background: var(--light);
            padding: 1.5rem;
            border-radius: 8px;
            text-align: center;
            transition: transform 0.3s;
        }
        .stat-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--secondary);
            margin-bottom: 1rem;
        }
        .function-section {
            background: var(--light);
            padding: 2rem;
            border-radius: 12px;
            margin: 3rem 0;
            border: 2px dashed var(--primary);
        }
        form {
            display: grid;
            gap: 1.5rem;
            max-width: 600px;
            margin: 0 auto;
        }
        input, textarea, select {
            padding: 1rem;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus {
            border-color: var(--primary);
            outline: none;
        }
        button {
            padding: 1rem 2rem;
            background: var(--primary);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        button:hover {
            background: var(--secondary);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.2);
        }
        .rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 5px;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2.5rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: var(--accent);
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 3rem 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 3rem;
        }
        .footer-section h3 {
            color: var(--accent);
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .friend-links a {
            color: white;
            text-decoration: none;
            display: block;
            margin-bottom: 0.8rem;
            padding: 0.5rem;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .friend-links a:hover {
            background: rgba(255,255,255,0.1);
            padding-left: 1rem;
        }
        .social-icons {
            display: flex;
            gap: 1rem;
            margin-top: 1rem;
        }
        .social-icons a {
            color: white;
            font-size: 1.5rem;
            transition: color 0.3s;
        }
        .social-icons a:hover {
            color: var(--accent);
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid var(--gray);
            font-size: 0.9rem;
            color: #bbb;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.8rem; }
            h2 { font-size: 2.2rem; }
            article { padding: 2rem; }
        }
        @media (max-width: 768px) {
            .header-container { padding: 1rem; }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: var(--primary);
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1rem;
                box-shadow: var(--shadow);
            }
            nav ul.active {
                display: flex;
            }
            .hamburger { display: block; }
            .float-left, .float-right {
                float: none;
                margin: 1rem auto;
                max-width: 100%;
            }
            main { padding: 0 1rem; }
            article { padding: 1.5rem; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .footer-container {
                grid-template-columns: 1fr;
            }
        }