* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }
        ul {
            list-style: none;
        }
        button, input, textarea {
            font-family: inherit;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .highlight {
            background-color: #fffacd;
            padding: 2px 4px;
            border-radius: 3px;
        }
        .section-padding {
            padding: 60px 0;
        }
        header {
            background: linear-gradient(135deg, #1a5fb4 0%, #2d7dd2 100%);
            color: white;
            padding: 15px 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #ffde57;
            text-shadow: 2px 2px 0 #1a5fb4;
        }
        .logo a:hover {
            color: #ffcc00;
        }
        nav.desktop-nav ul {
            display: flex;
            gap: 30px;
        }
        nav.desktop-nav a {
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
        }
        nav.desktop-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: white;
            cursor: pointer;
        }
        .mobile-nav {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            background-color: #1a5fb4;
            padding: 20px;
            box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        }
        .mobile-nav.active {
            display: block;
        }
        .mobile-nav ul {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .mobile-nav a {
            display: block;
            padding: 12px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
            font-weight: 600;
        }
        .mobile-nav a:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 12px 0;
            font-size: 0.9rem;
            margin-bottom: 30px;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb a {
            color: #1a5fb4;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            margin: 0 5px;
            color: #6c757d;
        }
        main {
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 30px auto;
            overflow: hidden;
        }
        .article-header {
            padding: 40px 20px;
            background: linear-gradient(to right, #2d7dd2, #26a269);
            color: white;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            font-size: 0.95rem;
            opacity: 0.9;
        }
        .article-meta i {
            margin-right: 5px;
        }
        .content {
            padding: 40px;
        }
        .content p {
            margin-bottom: 1.5rem;
            line-height: 1.8;
        }
        .content h2 {
            font-size: 2rem;
            color: #1a5fb4;
            margin: 2.5rem 0 1.5rem;
            padding-bottom: 10px;
            border-bottom: 3px solid #ffde57;
        }
        .content h3 {
            font-size: 1.6rem;
            color: #26a269;
            margin: 2rem 0 1rem;
        }
        .content ul, .content ol {
            margin-bottom: 1.5rem;
            padding-left: 2rem;
        }
        .content li {
            margin-bottom: 0.8rem;
        }
        .featured-image {
            margin: 30px 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .featured-image figcaption {
            text-align: center;
            font-style: italic;
            padding: 10px;
            background-color: #f8f9fa;
            color: #666;
        }
        .tip-box {
            background-color: #e7f5ff;
            border-left: 5px solid #1a5fb4;
            padding: 20px;
            margin: 30px 0;
            border-radius: 0 10px 10px 0;
        }
        .tip-box h4 {
            color: #1a5fb4;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .warning-box {
            background-color: #fff4e6;
            border-left: 5px solid #ff9423;
            padding: 20px;
            margin: 30px 0;
            border-radius: 0 10px 10px 0;
        }
        .warning-box h4 {
            color: #e67e22;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interactive-section {
            background-color: #f8f9fa;
            padding: 40px;
            margin: 40px 0;
            border-radius: 10px;
            border: 1px solid #dee2e6;
        }
        .interactive-section h2 {
            text-align: center;
            color: #1a5fb4;
            margin-bottom: 30px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #495057;
        }
        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: #1a5fb4;
            box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.2);
        }
        .btn {
            display: inline-block;
            padding: 12px 25px;
            background-color: #1a5fb4;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        .btn:hover {
            background-color: #155093;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(26, 95, 180, 0.3);
        }
        .star-rating {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 20px 0;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #ffc107;
        }
        .comments-display {
            margin-top: 40px;
        }
        .comment {
            background-color: white;
            padding: 20px;
            border-radius: 10px;
            margin-bottom: 20px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 10px;
            font-size: 0.9rem;
            color: #666;
        }
        .long-tail-links {
            background-color: #2d3748;
            padding: 40px 0;
            color: #e2e8f0;
        }
        .web-link {
            display: inline-block;
            margin: 10px 15px;
            padding: 8px 15px;
            background-color: #4a5568;
            border-radius: 20px;
            transition: all 0.3s;
        }
        .web-link:hover {
            background-color: #1a5fb4;
            transform: translateY(-3px);
        }
        footer {
            background-color: #1a202c;
            color: #a0aec0;
            padding: 40px 0 20px;
            text-align: center;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-links a:hover {
            color: #ffde57;
        }
        .copyright {
            border-top: 1px solid #2d3748;
            padding-top: 20px;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .header-container {
                flex-wrap: wrap;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                flex-direction: column;
                gap: 10px;
            }
            .content {
                padding: 20px;
            }
            .content h2 {
                font-size: 1.6rem;
            }
            .content h3 {
                font-size: 1.3rem;
            }
            .interactive-section {
                padding: 25px;
            }
            .footer-links {
                flex-direction: column;
                gap: 15px;
            }
        }
        @media (max-width: 480px) {
            .article-header {
                padding: 25px 15px;
            }
            .btn {
                width: 100%;
            }
        }