:root {
            --primary-color: #1a365d; 
            --secondary-color: #c53030; 
            --accent-color: #f6ad55; 
            --light-color: #f7fafc;
            --dark-color: #2d3748;
            --gray-color: #a0aec0;
            --max-width: 1200px;
            --font-heading: 'Segoe UI', system-ui, sans-serif;
            --font-body: 'Open Sans', sans-serif;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-body);
            line-height: 1.7;
            color: var(--dark-color);
            background-color: #f8f9fa;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            color: var(--secondary-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary-color), #2a4365);
            color: white;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .my-logo {
            font-family: var(--font-heading);
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-color);
            text-transform: uppercase;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .my-logo:hover {
            color: white;
            text-decoration: none;
        }
        .search-form {
            display: flex;
            flex-grow: 0.5;
            max-width: 500px;
        }
        .search-form input {
            flex-grow: 1;
            padding: 12px 20px;
            border: none;
            border-radius: 30px 0 0 30px;
            font-size: 1rem;
            outline: none;
        }
        .search-form button {
            background-color: var(--secondary-color);
            color: white;
            border: none;
            border-radius: 0 30px 30px 0;
            padding: 0 25px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
        }
        .search-form button:hover {
            background-color: #9b2c2c;
        }
        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        nav ul {
            display: flex;
            list-style: none;
            background-color: rgba(255,255,255,0.05);
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        nav li {
            flex: 1;
            text-align: center;
        }
        nav a {
            display: block;
            padding: 18px 10px;
            color: white;
            font-weight: 600;
            border-bottom: 3px solid transparent;
            transition: all 0.3s;
        }
        nav a:hover, nav a.active {
            background-color: rgba(255,255,255,0.1);
            border-bottom-color: var(--accent-color);
            text-decoration: none;
        }
        .breadcrumb {
            padding: 12px 20px;
            background-color: var(--light-color);
            color: var(--dark-color);
            font-size: 0.9rem;
            border-bottom: 1px solid #e2e8f0;
        }
        .breadcrumb a {
            color: var(--primary-color);
        }
        main {
            flex: 1;
            padding: 40px 0;
        }
        article {
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            padding: 40px;
            margin-bottom: 40px;
        }
        h1 {
            font-family: var(--font-heading);
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid var(--accent-color);
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary-color);
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 8px;
            border-bottom: 1px dashed var(--gray-color);
        }
        h3 {
            font-size: 1.7rem;
            color: var(--secondary-color);
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: var(--dark-color);
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .intro {
            font-size: 1.2rem;
            color: var(--dark-color);
            background: linear-gradient(to right, var(--light-color), transparent);
            padding: 20px;
            border-left: 5px solid var(--accent-color);
            margin-bottom: 2.5rem;
            border-radius: 0 8px 8px 0;
        }
        .highlight {
            background-color: #fffaf0;
            border-left: 4px solid var(--accent-color);
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
        }
        .stats-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .stat-card {
            background: linear-gradient(145deg, #edf2f7, #e2e8f0);
            padding: 25px;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        .stat-card:hover {
            transform: translateY(-5px);
        }
        .stat-card h4 {
            color: var(--primary-color);
            margin-top: 0;
        }
        .stat-card .number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary-color);
            display: block;
            line-height: 1;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            display: block;
            margin: 30px auto;
            border: 1px solid #e2e8f0;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray-color);
            margin-top: -20px;
            margin-bottom: 30px;
            font-size: 0.95rem;
        }
        blockquote {
            font-style: italic;
            color: #4a5568;
            border-left: 5px solid var(--secondary-color);
            padding: 20px 30px;
            margin: 30px 0;
            background-color: #fef2f2;
            border-radius: 0 8px 8px 0;
        }
        .link-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin: 25px 0;
        }
        .link-btn {
            background-color: var(--primary-color);
            color: white;
            padding: 10px 20px;
            border-radius: 30px;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.3s;
        }
        .link-btn:hover {
            background-color: var(--secondary-color);
            color: white;
            text-decoration: none;
            transform: scale(1.05);
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        aside {
            background-color: var(--light-color);
            padding: 25px;
            border-radius: 10px;
            height: fit-content;
            box-shadow: 0 4px 10px rgba(0,0,0,0.05);
        }
        .update-time {
            background-color: #e6fffa;
            padding: 15px;
            border-radius: 8px;
            text-align: center;
            margin-top: 40px;
            border: 1px solid #81e6d9;
            font-weight: 600;
            color: var(--primary-color);
        }
        .interactive-section {
            background-color: #f0f9ff;
            padding: 30px;
            border-radius: 12px;
            margin: 40px 0;
            border: 1px solid #bee3f8;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--primary-color);
        }
        .form-control {
            width: 100%;
            padding: 14px;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(246, 173, 85, 0.3);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 5px;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: #cbd5e0;
            cursor: pointer;
            transition: color 0.3s;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: var(--accent-color);
        }
        .btn-submit {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
        }
        .btn-submit:hover {
            background: linear-gradient(to right, var(--secondary-color), var(--primary-color));
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(0,0,0,0.15);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 50px 0 20px;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: var(--accent-color);
            font-size: 1.4rem;
            margin-bottom: 20px;
            border-bottom: 2px solid rgba(255,255,255,0.1);
            padding-bottom: 10px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #cbd5e0;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: inline-block;
            background-color: rgba(255,255,255,0.1);
            padding: 8px 15px;
            border-radius: 5px;
            margin: 5px;
            transition: background 0.3s;
        }
        friend-link a {
            color: var(--accent-color);
        }
        friend-link:hover {
            background-color: rgba(255,255,255,0.2);
        }
        .copyright {
            text-align: center;
            padding-top: 25px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #a0aec0;
            font-size: 0.9rem;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-top {
                flex-wrap: wrap;
            }
            .search-form {
                order: 3;
                flex-grow: 1;
                margin-top: 15px;
                max-width: 100%;
            }
            .mobile-toggle {
                display: block;
            }
            nav ul {
                flex-direction: column;
                display: none;
                border-top: none;
            }
            nav.active ul {
                display: flex;
            }
            nav li {
                text-align: left;
            }
            nav a {
                padding: 15px 20px;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            article {
                padding: 25px;
            }
            .footer-content {
                grid-template-columns: 1fr;
                gap: 30px;
            }
        }