* {
            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%, #e4e8ed 100%);
            max-width: 100%;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: #2a5caa;
            transition: color 0.3s ease, transform 0.2s ease;
        }
        a:hover {
            color: #e63946;
            transform: translateY(-1px);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        ul, ol {
            padding-left: 1.8em;
            margin: 1.2em 0;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .section-padding {
            padding: 4rem 0;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight {
            background: linear-gradient(120deg, #ffec8a 0%, #ffec8a 100%);
            padding: 0 6px;
            border-radius: 3px;
        }
        .emoji { font-size: 1.2em; }
        header {
            background: linear-gradient(90deg, #1e3c72 0%, #2a5298 100%);
            color: white;
            padding: 1.2rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            background: linear-gradient(to right, #4cc9f0, #4361ee);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.5px;
            font-family: 'Arial Black', sans-serif;
        }
        .my-logo:hover {
            transform: scale(1.03);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 2.2rem;
            margin: 0;
            padding: 0;
        }
        nav a {
            color: #e9ecef;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0.8rem;
            border-radius: 6px;
        }
        nav a:hover {
            background: rgba(255,255,255,0.15);
            color: white;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            background: none;
            border: none;
            color: white;
        }
        .breadcrumb {
            background: #f8f9fa;
            padding: 1rem 0;
            border-bottom: 1px solid #dee2e6;
            font-size: 0.95rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            padding-left: 0;
            margin: 0;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin: 0 10px;
            color: #6c757d;
        }
        .breadcrumb a {
            color: #495057;
        }
        .breadcrumb a:hover {
            color: #1e3c72;
        }
        main {
            background: white;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            margin: 2.5rem auto;
            overflow: hidden;
            padding: 3rem;
        }
        @media (max-width: 768px) {
            main {
                padding: 1.8rem;
                margin: 1.5rem auto;
            }
        }
        article {
            max-width: 900px;
            margin: 0 auto;
        }
        h1 {
            font-size: 3.2rem;
            color: #1e3c72;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #4361ee;
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #2a5298;
            margin: 2.8rem 0 1.5rem;
            padding-bottom: 0.7rem;
            border-bottom: 2px dashed #adb5bd;
        }
        h3 {
            font-size: 1.7rem;
            color: #3a5fc9;
            margin: 2.2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #4a6fdc;
            margin: 1.8rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.6rem;
            font-size: 1.15rem;
            color: #444;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.4rem;
            color: #555;
            font-weight: 500;
            line-height: 1.8;
            background: #f8f9ff;
            padding: 1.8rem;
            border-left: 5px solid #4361ee;
            border-radius: 0 8px 8px 0;
            margin: 2.5rem 0;
        }
        .info-box {
            background: #e7f3ff;
            border-left: 5px solid #2a5caa;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .float-img {
            float: right;
            margin: 0 0 1.5rem 2rem;
            max-width: 45%;
            border: 3px solid #e9ecef;
        }
        .clearfix::after {
            content: "";
            clear: both;
            display: table;
        }
        .search-box {
            background: #f1f8ff;
            padding: 2rem;
            border-radius: 12px;
            margin: 3rem 0;
            text-align: center;
            border: 1px solid #cfe2ff;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 1.5rem auto 0;
        }
        .search-form input {
            flex: 1;
            padding: 1rem 1.5rem;
            border: 2px solid #4361ee;
            border-radius: 8px 0 0 8px;
            font-size: 1.1rem;
            outline: none;
        }
        .search-form button {
            background: linear-gradient(90deg, #4361ee, #3a56d4);
            color: white;
            border: none;
            padding: 0 1.8rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-size: 1.2rem;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: linear-gradient(90deg, #3a56d4, #2e4bc2);
        }
        .user-interaction {
            background: #f9f9f9;
            padding: 2.5rem;
            border-radius: 12px;
            margin: 4rem 0;
            border: 1px solid #e0e0e0;
        }
        .form-group {
            margin-bottom: 1.8rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.6rem;
            font-weight: 600;
            color: #444;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.9rem 1.2rem;
            border: 1px solid #ccc;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #4361ee;
            outline: none;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ffc107;
            margin: 0.5rem 0;
        }
        .rating-stars i {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .rating-stars i:hover {
            transform: scale(1.2);
        }
        .submit-btn {
            background: linear-gradient(90deg, #2a9d8f, #1d7873);
            color: white;
            border: none;
            padding: 1rem 2.5rem;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
        }
        .submit-btn:hover {
            background: linear-gradient(90deg, #1d7873, #145c5c);
            transform: translateY(-2px);
            box-shadow: 0 5px 12px rgba(29, 120, 115, 0.3);
        }
        footer {
            background: #1a1a2e;
            color: #b0b7c3;
            padding: 3.5rem 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 h3 {
            color: #f8f9fa;
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            border-bottom: 2px solid #2a5caa;
            padding-bottom: 0.7rem;
        }
        friend-link {
            display: block;
            margin: 0.8rem 0;
        }
        friend-link a {
            color: #6ea8fe;
        }
        friend-link a:hover {
            color: #a6c8ff;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #2d3748;
            font-size: 0.95rem;
            color: #8a94a6;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.7rem; }
            h2 { font-size: 2rem; }
            h3 { font-size: 1.6rem; }
            .float-img {
                float: none;
                margin: 1.5rem auto;
                max-width: 80%;
            }
        }
        @media (max-width: 768px) {
            .header-content {
                flex-wrap: wrap;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1e3c72;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1.5rem;
                border-top: 1px solid #2a5298;
                gap: 1.2rem;
            }
            nav ul.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            h1 { font-size: 2.3rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .section-padding { padding: 2.5rem 0; }
            main { padding: 1.5rem; }
            .lead { font-size: 1.2rem; padding: 1.3rem; }
            .user-interaction { padding: 1.8rem; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            .my-logo { font-size: 1.8rem; }
            .search-form { flex-direction: column; }
            .search-form input { border-radius: 8px; margin-bottom: 0.8rem; }
            .search-form button { border-radius: 8px; padding: 1rem; }
        }
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        main {
            animation: fadeInUp 0.6s ease-out;
        }
        .pulse {
            display: inline-block;
            animation: pulse 2s infinite;
        }
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }