:root {
            --primary-color: #1a5fb4;
            --secondary-color: #e5a50a;
            --accent-color: #c64600;
            --dark-color: #2d2d2d;
            --light-color: #f7f7f7;
            --gray-color: #777;
            --shadow: 0 4px 12px rgba(0,0,0,0.1);
            --border-radius: 8px;
            --transition: all 0.3s ease;
            --max-width: 1200px;
        }
        * {
            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: var(--dark-color);
            background-color: #fff;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-color), #0d3b8c);
            color: white;
            padding: 1rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--secondary-color);
            text-shadow: 2px 2px 0 var(--accent-color);
            letter-spacing: 1px;
        }
        .my-logo:hover {
            transform: scale(1.05);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: var(--border-radius);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background-color: rgba(255, 255, 255, 0.2);
            color: var(--secondary-color);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: var(--light-color);
            border-bottom: 1px solid #eee;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin: 0 10px;
            color: var(--gray-color);
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .page-hero {
            text-align: center;
            padding: 3rem 1rem;
            background: linear-gradient(to right, #f8f9fa, #e9ecef);
            margin-bottom: 2rem;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
        }
        .page-hero h1 {
            font-size: 2.8rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        .page-hero p {
            font-size: 1.2rem;
            color: var(--gray-color);
            max-width: 800px;
            margin: 0 auto;
        }
        .search-section {
            background-color: var(--light-color);
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 2rem auto;
            max-width: 800px;
            box-shadow: var(--shadow);
        }
        .search-form {
            display: flex;
            gap: 0;
        }
        .search-form input {
            flex: 1;
            padding: 1rem;
            border: 2px solid #ddd;
            border-right: none;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
        }
        .search-form button {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 1rem 1.5rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-weight: bold;
        }
        .search-form button:hover {
            background-color: #0d3b8c;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
        }
        .main-content {
            font-size: 1.1rem;
        }
        .main-content h2, .main-content h3, .main-content h4 {
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        .main-content h2 {
            font-size: 2rem;
            border-bottom: 3px solid var(--secondary-color);
            padding-bottom: 0.5rem;
        }
        .main-content h3 {
            font-size: 1.7rem;
        }
        .main-content h4 {
            font-size: 1.4rem;
            color: var(--accent-color);
        }
        .main-content p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .main-content emoji {
            font-size: 1.2em;
            margin-right: 0.3em;
        }
        .main-content strong {
            color: var(--accent-color);
            font-weight: 700;
        }
        .main-content a {
            color: var(--primary-color);
            font-weight: 600;
            border-bottom: 1px dotted var(--primary-color);
        }
        .main-content a:hover {
            color: var(--accent-color);
            border-bottom-style: solid;
        }
        .featured-image {
            float: right;
            margin: 0 0 1.5rem 1.5rem;
            max-width: 400px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            border: 5px solid white;
        }
        @media (max-width: 768px) {
            .featured-image {
                float: none;
                margin: 1.5rem auto;
                max-width: 100%;
            }
        }
        .highlight-box {
            background-color: #fff9e6;
            border-left: 5px solid var(--secondary-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .sidebar {
            background-color: var(--light-color);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 {
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--secondary-color);
        }
        .sidebar ul {
            list-style: none;
            margin-bottom: 2rem;
        }
        .sidebar li {
            margin-bottom: 0.75rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .sidebar li::before {
            content: '▶';
            position: absolute;
            left: 0;
            color: var(--secondary-color);
            font-size: 0.8rem;
        }
        .sidebar a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .user-interaction {
            background-color: #f9f9f9;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            margin: 3rem 0;
            box-shadow: var(--shadow);
        }
        .user-interaction h2 {
            color: var(--dark-color);
            margin-bottom: 2rem;
            text-align: center;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        .interaction-form {
            background: white;
            padding: 1.5rem;
            border-radius: var(--border-radius);
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        .interaction-form h3 {
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-family: inherit;
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
        }
        .stars input {
            display: none;
        }
        .stars label {
            font-size: 1.8rem;
            color: #ccc;
            cursor: pointer;
            transition: var(--transition);
        }
        .stars label:hover,
        .stars label:hover ~ label {
            color: #ffc107;
        }
        .stars input:checked ~ label {
            color: #ffc107;
        }
        .btn-submit {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: bold;
            width: 100%;
            transition: var(--transition);
        }
        .btn-submit:hover {
            background-color: #0d3b8c;
        }
        .site-footer {
            background-color: var(--dark-color);
            color: #ddd;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-section ul {
            list-style: none;
        }
        .footer-section li {
            margin-bottom: 0.75rem;
        }
        .footer-section a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        friend-link {
            display: block;
            padding: 1rem;
            background-color: rgba(255,255,255,0.05);
            border-radius: var(--border-radius);
            margin-bottom: 1rem;
            border-left: 3px solid var(--secondary-color);
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.1);
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #444;
            font-size: 0.9rem;
            color: #aaa;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: var(--primary-color);
                padding: 1rem;
                box-shadow: var(--shadow);
                border-top: 2px solid var(--secondary-color);
            }
            .main-nav.active ul {
                display: flex;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
            .main-content h2 {
                font-size: 1.8rem;
            }
            .main-content h3 {
                font-size: 1.5rem;
            }
            .user-interaction {
                padding: 1.5rem;
            }
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }