:root {
            --primary-color: #d4af37;
            --secondary-color: #0f3460;
            --accent-color: #e63946;
            --text-dark: #2d3748;
            --text-light: #f7fafc;
            --bg-light: #edf2f7;
            --bg-dark: #1a202c;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--bg-light);
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--bg-dark) 100%);
            color: var(--text-light);
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            font-size: 2rem;
        }
        .breadcrumb {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 0.8rem;
            border-radius: 5px;
            margin-top: 10px;
            width: 100%;
            order: 3;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            margin-right: 10px;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--primary-color);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-links a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
        }
        .nav-links a:hover, .nav-links a.active {
            background-color: var(--primary-color);
            color: var(--secondary-color);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--text-light);
            cursor: pointer;
        }
        .search-form {
            display: flex;
            margin-top: 15px;
            width: 100%;
            order: 4;
        }
        .search-form input {
            flex-grow: 1;
            padding: 0.8rem 1rem;
            border: none;
            border-radius: 4px 0 0 4px;
            font-size: 1rem;
        }
        .search-form button {
            background-color: var(--accent-color);
            color: white;
            border: none;
            padding: 0 1.5rem;
            border-radius: 0 4px 4px 0;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-form button:hover {
            background-color: #c1121f;
        }
        main {
            padding: 2rem 0;
        }
        .article-header {
            text-align: center;
            margin-bottom: 3rem;
            padding: 2rem;
            background: linear-gradient(135deg, #ffffff 0%, #f0f4f8 100%);
            border-radius: 10px;
            box-shadow: var(--shadow);
        }
        .article-header h1 {
            color: var(--secondary-color);
            font-size: 2.8rem;
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            gap: 2rem;
            color: #718096;
            font-size: 0.9rem;
            margin-top: 1.5rem;
            flex-wrap: wrap;
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .content-section {
            background-color: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin-bottom: 2.5rem;
        }
        .content-section h2 {
            color: var(--secondary-color);
            font-size: 2.2rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.8rem;
            border-bottom: 3px solid var(--primary-color);
            display: inline-block;
        }
        .content-section h3 {
            color: var(--secondary-color);
            font-size: 1.8rem;
            margin: 1.8rem 0 1rem;
        }
        .content-section p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background-color: #fffacd;
            padding: 1.5rem;
            border-left: 5px solid var(--primary-color);
            margin: 2rem 0;
            border-radius: 0 5px 5px 0;
        }
        .calculator-tool {
            background-color: #f0f8ff;
            padding: 2rem;
            border-radius: 10px;
            border: 2px dashed var(--secondary-color);
            margin: 3rem 0;
            text-align: center;
        }
        .tool-title {
            font-size: 1.8rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        .tool-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin-top: 2rem;
        }
        .tool-input {
            display: flex;
            flex-direction: column;
            text-align: left;
        }
        .tool-input label {
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--secondary-color);
        }
        .tool-input select, .tool-input input {
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
            font-size: 1rem;
        }
        .calculate-btn {
            background-color: var(--accent-color);
            color: white;
            border: none;
            padding: 1rem 2rem;
            font-size: 1.2rem;
            border-radius: 5px;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 1.5rem;
            grid-column: 1 / -1;
            justify-self: center;
        }
        .calculate-btn:hover {
            background-color: #c1121f;
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        .result-box {
            background-color: #e6f7e9;
            padding: 2rem;
            border-radius: 10px;
            margin-top: 2rem;
            display: none;
            border: 2px solid #38a169;
        }
        .result-box h3 {
            color: #2f855a;
            margin-bottom: 1rem;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: var(--shadow);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .info-card {
            background: linear-gradient(135deg, #fdfcfb 0%, #e2d1c3 100%);
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
            border-left: 5px solid var(--primary-color);
            transition: var(--transition);
            cursor: pointer;
        }
        .info-card:hover {
            transform: translateX(10px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        .tip-box {
            background-color: #ebf8ff;
            border: 1px solid #90cdf4;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            position: relative;
            padding-left: 3.5rem;
        }
        .tip-box::before {
            content: "\f0eb";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            position: absolute;
            left: 1rem;
            top: 1.5rem;
            color: #2b6cb0;
            font-size: 1.5rem;
        }
        .user-interaction {
            background-color: white;
            padding: 2.5rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin: 3rem 0;
        }
        .interaction-tabs {
            display: flex;
            border-bottom: 2px solid #e2e8f0;
            margin-bottom: 2rem;
        }
        .tab-btn {
            padding: 1rem 2rem;
            background: none;
            border: none;
            font-size: 1.1rem;
            font-weight: 600;
            color: #718096;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
        }
        .tab-btn.active {
            color: var(--secondary-color);
        }
        .tab-btn.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary-color);
        }
        .tab-content {
            display: none;
        }
        .tab-content.active {
            display: block;
            animation: fadeIn 0.5s ease;
        }
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        .comment-form, .rating-form {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group label {
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--secondary-color);
        }
        .form-group input, .form-group textarea, .form-group select {
            padding: 0.8rem;
            border: 1px solid #cbd5e0;
            border-radius: 5px;
            font-size: 1rem;
            font-family: inherit;
        }
        .form-group textarea {
            min-height: 150px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            font-size: 2rem;
            gap: 5px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #cbd5e0;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: var(--primary-color);
        }
        .submit-btn {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            padding: 1rem 2rem;
            font-size: 1.1rem;
            border-radius: 5px;
            cursor: pointer;
            transition: var(--transition);
            align-self: flex-start;
        }
        .submit-btn:hover {
            background-color: #1e2d4a;
            transform: translateY(-3px);
        }
        .internal-links {
            background-color: var(--bg-dark);
            color: var(--text-light);
            padding: 2.5rem;
            margin-top: 3rem;
            border-radius: 10px 10px 0 0;
        }
        .internal-links h3 {
            color: var(--primary-color);
            text-align: center;
            margin-bottom: 2rem;
            font-size: 1.8rem;
        }
        .web-links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1.2rem;
        }
        .web-link {
            background-color: rgba(255, 255, 255, 0.1);
            padding: 1.2rem;
            border-radius: 5px;
            transition: var(--transition);
        }
        .web-link:hover {
            background-color: rgba(212, 175, 55, 0.2);
            transform: translateY(-5px);
        }
        .web-link a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 500;
            display: block;
            line-height: 1.5;
        }
        .web-link a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .site-footer {
            background-color: var(--secondary-color);
            color: var(--text-light);
            padding: 3rem 0 1.5rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
        }
        .footer-logo a {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 1rem;
        }
        .footer-about p {
            margin-top: 1rem;
            opacity: 0.9;
            line-height: 1.6;
        }
        .footer-links h4, .footer-contact h4 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: var(--text-light);
            text-decoration: none;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links a:hover {
            color: var(--primary-color);
            transform: translateX(5px);
        }
        .contact-info p {
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.9rem;
            opacity: 0.8;
        }
        @media (max-width: 992px) {
            .header-container {
                flex-direction: column;
                align-items: stretch;
            }
            .logo {
                align-self: flex-start;
            }
            .hamburger {
                display: block;
                position: absolute;
                top: 1.5rem;
                right: 20px;
            }
            .main-nav {
                width: 100%;
                display: none;
                margin-top: 1rem;
            }
            .nav-links {
                flex-direction: column;
                width: 100%;
                gap: 0.5rem;
            }
            .nav-links a {
                display: block;
                padding: 1rem;
                text-align: center;
                background-color: rgba(255, 255, 255, 0.1);
            }
            .nav-links.active {
                display: flex;
            }
            .breadcrumb {
                order: 2;
                margin-top: 1rem;
            }
            .search-form {
                order: 3;
                margin-top: 1rem;
            }
            .article-header h1 {
                font-size: 2.2rem;
            }
            .content-section {
                padding: 1.8rem;
            }
            .content-section h2 {
                font-size: 1.8rem;
            }
            .content-section h3 {
                font-size: 1.5rem;
            }
            .tool-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            .container {
                padding: 0 15px;
            }
            .article-header {
                padding: 1.5rem;
            }
            .article-header h1 {
                font-size: 1.8rem;
            }
            .article-meta {
                flex-direction: column;
                gap: 0.8rem;
                align-items: center;
            }
            .content-section {
                padding: 1.5rem;
            }
            .interaction-tabs {
                flex-direction: column;
            }
            .tab-btn {
                text-align: left;
                border-bottom: 1px solid #e2e8f0;
            }
            .footer-container {
                grid-template-columns: 1fr;
            }
        }