* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            max-width: 100%;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: #2c3e50;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-top: 1.5rem;
            border-bottom: 3px solid #3f51b5;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.2rem;
            color: #303f9f;
            margin-top: 2.5rem;
            padding-left: 0.5rem;
            border-left: 4px solid #5c6bc0;
        }
        h3 {
            font-size: 1.8rem;
            color: #3949ab;
            margin-top: 2rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a237e 0%, #303f9f 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;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: #ffd700;
        }
        .logo span {
            background: linear-gradient(to right, #ffd700, #ffecb3);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .nav-desktop a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: #1a237e;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            padding: 1rem;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            text-decoration: none;
            padding: 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            transition: background-color 0.3s;
        }
        .nav-mobile a:hover {
            background-color: rgba(255,255,255,0.1);
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 0.8rem 0;
            margin-bottom: 2rem;
            border-radius: 0 0 8px 8px;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
        }
        .breadcrumb li:not(:last-child)::after {
            content: ">";
            margin-left: 0.5rem;
            color: #5c6bc0;
        }
        .breadcrumb a {
            color: #3f51b5;
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 2rem 0;
            background-color: white;
            border-radius: 8px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 2rem;
        }
        .article-content {
            padding: 0 2rem;
        }
        @media (max-width: 768px) {
            .article-content {
                padding: 0 1rem;
            }
        }
        .hero-image {
            width: 100%;
            height: 400px;
            background: linear-gradient(rgba(26, 35, 126, 0.7), rgba(48, 63, 159, 0.7)), url('https://images.unsplash.com/photo-1550745165-9bc0b252726f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            border-radius: 8px;
            margin: 2rem 0;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            text-align: center;
            padding: 2rem;
        }
        .hero-image h2 {
            color: white;
            border: none;
            font-size: 2.5rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.5);
        }
        .search-container {
            background: linear-gradient(135deg, #e8eaf6 0%, #c5cae9 100%);
            padding: 2rem;
            border-radius: 10px;
            margin: 2.5rem 0;
            text-align: center;
            box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        }
        .search-container h3 {
            color: #1a237e;
            margin-bottom: 1.5rem;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex: 1;
            padding: 0.8rem 1.2rem;
            border: 2px solid #3f51b5;
            border-radius: 4px 0 0 4px;
            font-size: 1rem;
            outline: none;
        }
        .search-button {
            background: linear-gradient(to right, #3f51b5, #5c6bc0);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            font-weight: 600;
            transition: all 0.3s ease;
        }
        .search-button:hover {
            background: linear-gradient(to right, #303f9f, #3f51b5);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(63, 81, 181, 0.3);
        }
        .tier-table {
            width: 100%;
            border-collapse: collapse;
            margin: 2.5rem 0;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            border-radius: 8px;
            overflow: hidden;
        }
        .tier-table th {
            background: linear-gradient(135deg, #1a237e 0%, #303f9f 100%);
            color: white;
            padding: 1.2rem;
            text-align: left;
            font-weight: 700;
        }
        .tier-table td {
            padding: 1rem;
            border-bottom: 1px solid #eee;
        }
        .tier-table tr:nth-child(even) {
            background-color: #f5f5f5;
        }
        .tier-table tr:hover {
            background-color: #e8eaf6;
            transform: translateX(5px);
            transition: all 0.3s ease;
        }
        .tier-badge {
            display: inline-block;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-weight: 700;
            font-size: 0.85rem;
            margin-right: 0.5rem;
        }
        .tier-s { background-color: #ff4081; color: white; }
        .tier-a { background-color: #ff9100; color: white; }
        .tier-b { background-color: #00b0ff; color: white; }
        .tier-c { background-color: #00c853; color: white; }
        .user-interaction {
            background-color: #f5f5f5;
            padding: 2.5rem;
            border-radius: 10px;
            margin: 3rem 0;
            border-left: 5px solid #3f51b5;
        }
        .rating-section, .comment-section {
            margin-bottom: 2.5rem;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star-rating i {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s, transform 0.2s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .star-rating i.active {
            color: #ffd700;
        }
        .comment-form textarea {
            width: 100%;
            padding: 1rem;
            border: 2px solid #c5cae9;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            margin-top: 1rem;
            min-height: 150px;
            resize: vertical;
        }
        .submit-button {
            background: linear-gradient(to right, #3f51b5, #5c6bc0);
            color: white;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 4px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            margin-top: 1rem;
            transition: all 0.3s ease;
        }
        .submit-button:hover {
            background: linear-gradient(to right, #303f9f, #3f51b5);
            transform: translateY(-3px);
            box-shadow: 0 5px 10px rgba(63, 81, 181, 0.3);
        }
        .highlight {
            background-color: #e8eaf6;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 4px solid #3f51b5;
        }
        .tip-box {
            background-color: #e8f5e9;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 4px solid #4caf50;
        }
        .tip-box:before {
            content: "💡";
            margin-right: 0.5rem;
            font-size: 1.2rem;
        }
        .warning-box {
            background-color: #ffebee;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 4px solid #f44336;
        }
        .warning-box:before {
            content: "⚠️";
            margin-right: 0.5rem;
            font-size: 1.2rem;
        }
        .content-links {
            margin: 2rem 0;
            padding: 1.5rem;
            background-color: #f5f5f5;
            border-radius: 8px;
        }
        .content-links h3 {
            margin-bottom: 1.2rem;
            color: #1a237e;
        }
        .content-links ul {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
        }
        .content-links a {
            color: #3f51b5;
            text-decoration: none;
            display: block;
            padding: 0.8rem;
            background-color: white;
            border-radius: 4px;
            transition: all 0.3s ease;
            border: 1px solid #e0e0e0;
        }
        .content-links a:hover {
            background-color: #e8eaf6;
            transform: translateX(5px);
            border-color: #3f51b5;
        }
        .web-links {
            background: linear-gradient(135deg, #1a237e 0%, #303f9f 100%);
            padding: 2.5rem 0;
            margin-top: 3rem;
        }
        .web-links .container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1.5rem;
        }
        .web-link {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 1.2rem;
            border-radius: 6px;
            transition: all 0.3s ease;
        }
        .web-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-5px);
        }
        .web-link a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            display: block;
            text-align: center;
        }
        footer {
            background-color: #0d1531;
            color: white;
            padding: 2.5rem 0;
            text-align: center;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1.5rem;
        }
        .copyright {
            font-size: 0.9rem;
            color: #b0b0b0;
            margin-top: 1rem;
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.5rem; }
            .hero-image {
                height: 250px;
            }
            .hero-image h2 {
                font-size: 1.8rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-input {
                border-radius: 4px;
                margin-bottom: 0.5rem;
            }
            .search-button {
                border-radius: 4px;
                width: 100%;
            }
            .tier-table {
                display: block;
                overflow-x: auto;
            }
            .content-links ul {
                grid-template-columns: 1fr;
            }
            .web-links .container {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .web-links .container {
                grid-template-columns: 1fr;
            }
            .user-interaction {
                padding: 1.5rem;
            }
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fade-in {
            animation: fadeIn 0.8s ease-out;
        }
        .text-center { text-align: center; }
        .text-bold { font-weight: 700; }
        .text-highlight { color: #3f51b5; font-weight: 700; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .emoji { font-size: 1.2rem; margin-right: 0.3rem; }