* {
            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-color: #f8f9fa;
            max-width: 100%;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        h1, h2, h3, h4 {
            font-family: 'Georgia', serif;
            color: #1a365d;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.5rem);
            border-bottom: 4px solid #e63946;
            padding-bottom: 0.5rem;
            margin-top: 1.5rem;
        }
        h2 {
            font-size: clamp(1.8rem, 4vw, 2.5rem);
            color: #2d3748;
            margin-top: 2.5rem;
            padding-left: 0.5rem;
            border-left: 5px solid #4cc9f0;
        }
        h3 {
            font-size: clamp(1.4rem, 3vw, 1.9rem);
            color: #4a5568;
            margin-top: 2rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #718096;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 300;
            color: #2d3748;
            background: #e9f5ff;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
        }
        em {
            color: #e63946;
            font-style: italic;
        }
        strong {
            color: #1a365d;
            font-weight: 700;
        }
        a {
            color: #3182ce;
            text-decoration: none;
            transition: color 0.3s ease, border-bottom 0.3s ease;
            border-bottom: 1px dotted transparent;
        }
        a:hover {
            color: #e63946;
            border-bottom: 1px dotted #e63946;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        main.container {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
            margin-top: 2rem;
            margin-bottom: 3rem;
        }
        .site-header {
            background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
            color: white;
            padding: 1rem 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;
        }
        .logo a {
            color: white;
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            border: none;
        }
        .logo a:hover {
            color: #4cc9f0;
        }
        .logo span {
            color: #e63946;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: #cbd5e0;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 2px solid transparent;
        }
        .nav-desktop a:hover,
        .nav-desktop a.active {
            color: white;
            border-bottom-color: #e63946;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background: #2d3748;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            padding: 1rem;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: #cbd5e0;
            padding: 0.8rem;
            border-bottom: 1px solid #4a5568;
        }
        .nav-mobile a:hover {
            color: white;
            background: #4a5568;
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: #718096;
        }
        .breadcrumb a {
            color: #718096;
        }
        .breadcrumb a:hover {
            color: #3182ce;
        }
        .breadcrumb .separator {
            margin: 0 0.5rem;
            color: #a0aec0;
        }
        .search-box {
            margin: 2rem 0;
            background: #f1f5f9;
            padding: 1.5rem;
            border-radius: 10px;
            text-align: center;
        }
        .search-box h3 {
            margin-top: 0;
            color: #1a365d;
        }
        .search-form {
            display: flex;
            max-width: 600px;
            margin: 1rem auto;
        }
        .search-form input {
            flex-grow: 1;
            padding: 0.8rem 1rem;
            border: 2px solid #cbd5e0;
            border-radius: 6px 0 0 6px;
            font-size: 1rem;
            outline: none;
        }
        .search-form input:focus {
            border-color: #3182ce;
        }
        .search-form button {
            background: #3182ce;
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 6px 6px 0;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background: #2b6cb0;
        }
        .article-image {
            margin: 2.5rem auto;
            text-align: center;
        }
        .article-image img {
            border-radius: 10px;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            border: 1px solid #e2e8f0;
            max-height: 500px;
            object-fit: cover;
        }
        .article-caption {
            font-style: italic;
            color: #718096;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .highlight-box {
            background: linear-gradient(to right, #fff5f5, #fed7d7);
            border-left: 5px solid #e53e3e;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tool-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .tool-card {
            background: white;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            padding: 1.5rem;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .tool-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
        }
        .tool-card h4 {
            color: #2d3748;
            margin-bottom: 0.5rem;
        }
        .user-feedback {
            margin: 3rem 0;
            border-top: 2px solid #e2e8f0;
            padding-top: 2rem;
        }
        .rating-section, .comment-section {
            background: #f8f9fa;
            padding: 2rem;
            border-radius: 10px;
            margin-bottom: 2rem;
        }
        .rating-form, .comment-form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
            max-width: 700px;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #cbd5e0;
            cursor: pointer;
        }
        .stars .star:hover,
        .stars .star.active {
            color: #f6ad55;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group label {
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: #3182ce;
        }
        .submit-btn {
            background: #38a169;
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            align-self: flex-start;
            transition: background 0.3s;
        }
        .submit-btn:hover {
            background: #2f855a;
        }
        .site-footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #90cdf4;
            text-decoration: none;
        }
        friend-link a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #4a5568;
            font-size: 0.9rem;
            color: #a0aec0;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
            main.container {
                padding: 1.5rem;
            }
            .tool-list {
                grid-template-columns: 1fr;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form input {
                border-radius: 6px;
                margin-bottom: 0.5rem;
            }
            .search-form button {
                border-radius: 6px;
                padding: 0.8rem;
            }
            .footer-content {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }