* {
            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: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: #2a5db0;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #e63946;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .section-spacing {
            padding: 60px 0;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background: linear-gradient(to right, #2a5db0, #3a7bd5);
            color: white;
            border-radius: 30px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 12px rgba(42, 93, 176, 0.2);
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 18px rgba(42, 93, 176, 0.3);
            background: linear-gradient(to right, #3a7bd5, #4a8be5);
        }
        .text-center {
            text-align: center;
        }
        .highlight {
            background-color: #fffacd;
            padding: 2px 5px;
            border-radius: 3px;
        }
        .site-header {
            background: linear-gradient(90deg, #1e3c72 0%, #2a5298 100%);
            color: white;
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 1.8rem;
            color: #4cc9f0;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
            letter-spacing: 1px;
        }
        .my-logo span {
            color: #f72585;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
        }
        .main-nav li {
            margin-left: 25px;
        }
        .main-nav a {
            color: white;
            font-weight: 500;
            font-size: 1rem;
            padding: 8px 5px;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover,
        .main-nav a.active {
            color: #4cc9f0;
            border-bottom: 2px solid #4cc9f0;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e9f2fa;
            padding: 12px 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #d1e3f5;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "›";
            margin: 0 10px;
            color: #777;
        }
        .hero {
            background: radial-gradient(circle at top right, #a2c2e8, #e4edf5);
            padding: 80px 0 60px;
            border-bottom: 3px solid #2a5db0;
        }
        .hero h1 {
            font-size: 2.8rem;
            color: #1e3c72;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            color: #444;
            max-width: 800px;
            margin-bottom: 30px;
        }
        main article {
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            margin-bottom: 40px;
            padding: 40px;
        }
        h1 {
            font-size: 2.5rem;
            color: #1e3c72;
            margin-bottom: 25px;
            border-bottom: 3px solid #f72585;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2rem;
            color: #2a5298;
            margin: 35px 0 20px;
            padding-bottom: 10px;
            border-bottom: 1px dashed #c5d7f0;
        }
        h3 {
            font-size: 1.5rem;
            color: #3a7bd5;
            margin: 25px 0 15px;
        }
        h4 {
            font-size: 1.2rem;
            color: #555;
            margin: 20px 0 10px;
        }
        p {
            margin-bottom: 1.2em;
            text-align: justify;
        }
        .content-img {
            margin: 30px auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 6px 20px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 8px;
            font-size: 0.95rem;
        }
        ul, ol {
            margin-left: 25px;
            margin-bottom: 1.5em;
        }
        blockquote {
            background: linear-gradient(to right, #f8f9fa, #e9f2fa);
            border-left: 5px solid #2a5db0;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 8px 8px 0;
            font-style: italic;
        }
        .key-point {
            background-color: #e9f7ef;
            border-left: 5px solid #28a745;
            padding: 15px;
            margin: 20px 0;
            border-radius: 0 8px 8px 0;
        }
        .warning-box {
            background-color: #fff3cd;
            border-left: 5px solid #ffc107;
            padding: 15px;
            margin: 20px 0;
            border-radius: 0 8px 8px 0;
        }
        .interactive-module {
            background: linear-gradient(135deg, #f8f9fa, #eef5ff);
            border-radius: 12px;
            padding: 30px;
            margin: 40px 0;
            border: 1px solid #d1e3f5;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 12px;
            color: #1e3c72;
            margin-bottom: 25px;
        }
        .module-title i {
            font-size: 1.8rem;
            color: #f72585;
        }
        .search-form, .comment-form, .rating-form {
            display: grid;
            gap: 15px;
            max-width: 600px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
        }
        .form-group label {
            margin-bottom: 6px;
            font-weight: 600;
            color: #444;
        }
        .form-control {
            padding: 12px 16px;
            border: 2px solid #c5d7f0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        .form-control:focus {
            outline: none;
            border-color: #2a5db0;
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            gap: 8px;
            font-size: 1.8rem;
            color: #ffc107;
            cursor: pointer;
        }
        .star-rating i {
            transition: transform 0.2s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .internal-links {
            background-color: #f0f7ff;
            padding: 25px;
            border-radius: 10px;
            margin: 30px 0;
        }
        .internal-links h3 {
            margin-top: 0;
        }
        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin-top: 15px;
        }
        .links-grid a {
            display: block;
            background: white;
            padding: 12px 18px;
            border-radius: 8px;
            box-shadow: 0 3px 8px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }
        .links-grid a:hover {
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(42, 93, 176, 0.15);
            background-color: #e6f0ff;
        }
        .site-footer {
            background: linear-gradient(90deg, #1a1a2e 0%, #16213e 100%);
            color: #ddd;
            padding: 50px 0 20px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: #4cc9f0;
            margin-bottom: 20px;
            font-size: 1.3rem;
        }
        .footer-links a {
            display: block;
            color: #bbb;
            margin-bottom: 10px;
            transition: color 0.3s;
        }
        .footer-links a:hover {
            color: #4cc9f0;
        }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.05);
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 10px;
            border-left: 3px solid #4cc9f0;
        }
        friend-link a {
            color: #4cc9f0;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #2a3b5e;
            color: #aaa;
            font-size: 0.9rem;
        }
        .last-updated {
            background-color: #e9f7ef;
            padding: 10px 20px;
            border-radius: 8px;
            margin: 20px 0;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
        }
        .last-updated i {
            color: #28a745;
        }
        @media (max-width: 992px) {
            .hero h1 {
                font-size: 2.4rem;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .main-nav.active {
                max-height: 300px;
                margin-top: 15px;
            }
            .main-nav ul {
                flex-direction: column;
            }
            .main-nav li {
                margin: 10px 0;
                margin-left: 0;
            }
            .hero {
                padding: 60px 0 40px;
            }
            .hero h1 {
                font-size: 2rem;
            }
            main article {
                padding: 25px;
            }
            .internal-links .links-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .container {
                padding: 0 15px;
            }
            .interactive-module {
                padding: 20px;
            }
        }