:root {
            --primary: #1a6dfc;
            --secondary: #fc3c1a;
            --dark: #0a1428;
            --light: #f8f9fa;
            --gray: #6c757d;
            --success: #28a745;
            --warning: #ffc107;
            --shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --border-radius: 12px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f0f2f5;
            color: #333;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        ul {
            list-style: none;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .btn {
            display: inline-block;
            padding: 12px 28px;
            background: linear-gradient(to right, var(--primary), #0d4dc2);
            color: white;
            border-radius: 50px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 111, 252, 0.3);
        }
        .btn-secondary {
            background: linear-gradient(to right, var(--secondary), #d32a0a);
        }
        header {
            background-color: white;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 20px;
        }
        .logo a {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo i {
            color: var(--primary);
        }
        nav ul {
            display: flex;
            gap: 30px;
        }
        nav a {
            font-weight: 600;
            color: var(--dark);
            padding: 8px 0;
            position: relative;
        }
        nav a:hover {
            color: var(--primary);
        }
        nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.3s;
        }
        nav a:hover::after {
            width: 100%;
        }
        .search-box {
            display: flex;
            background: #f1f3f5;
            border-radius: 50px;
            overflow: hidden;
            padding: 5px;
            width: 300px;
        }
        .search-box input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 10px 15px;
            outline: none;
        }
        .search-box button {
            background: var(--primary);
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 50px;
            cursor: pointer;
        }
        .hamburger {
            display: none;
            font-size: 1.5rem;
            cursor: pointer;
            color: var(--dark);
        }
        .breadcrumb {
            background: #e9ecef;
            padding: 15px 20px;
            font-size: 0.9rem;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb span {
            color: var(--gray);
            margin: 0 8px;
        }
        .hero {
            background: linear-gradient(rgba(10, 20, 40, 0.85), rgba(10, 20, 40, 0.9)), url('https://images.unsplash.com/photo-1575361204480-aadea25e6e68?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 80px 20px;
            text-align: center;
            border-radius: 0 0 var(--border-radius) var(--border-radius);
            margin-bottom: 40px;
        }
        .hero h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
            opacity: 0.9;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 350px;
            gap: 40px;
            margin-bottom: 60px;
        }
        main article {
            background: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        h1, h2, h3 {
            color: var(--dark);
            margin-top: 1.5em;
            margin-bottom: 0.7em;
            line-height: 1.3;
        }
        h1 {
            font-size: 2.5rem;
        }
        h2 {
            font-size: 2rem;
            padding-bottom: 10px;
            border-bottom: 3px solid var(--primary);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--primary);
        }
        p {
            margin-bottom: 1.5em;
            font-size: 1.05rem;
        }
        .intro {
            font-size: 1.2rem;
            color: var(--dark);
            font-weight: 500;
            padding: 20px;
            background: #e7f0ff;
            border-left: 5px solid var(--primary);
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin-bottom: 2em;
        }
        .highlight {
            background: linear-gradient(120deg, #ffec99 0%, #ffec99 100%);
            padding: 3px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .feature-img {
            width: 100%;
            border-radius: var(--border-radius);
            margin: 30px 0;
            box-shadow: var(--shadow);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        blockquote {
            border-left: 4px solid var(--secondary);
            padding: 20px 30px;
            background: #fff5f5;
            margin: 30px 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            font-style: italic;
        }
        .tip-box {
            background: #d1ecf1;
            border-left: 5px solid #0dcaf0;
            padding: 20px;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            margin: 25px 0;
        }
        .tip-box h4 {
            color: #055160;
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .link-list {
            background: #f8f9fa;
            padding: 25px;
            border-radius: var(--border-radius);
            margin: 30px 0;
        }
        .link-list h3 {
            margin-top: 0;
        }
        .link-list ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
        }
        .link-list li a {
            display: block;
            padding: 12px 15px;
            background: white;
            border-radius: 8px;
            border: 1px solid #dee2e6;
            transition: var(--transition);
        }
        .link-list li a:hover {
            border-color: var(--primary);
            transform: translateX(5px);
            box-shadow: var(--shadow);
        }
        aside {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }
        .sidebar-widget {
            background: white;
            padding: 25px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
        }
        .widget-title {
            font-size: 1.3rem;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #e9ecef;
            color: var(--dark);
        }
        .download-cta {
            background: linear-gradient(135deg, var(--primary), #0a2a7a);
            color: white;
            text-align: center;
            padding: 30px 25px;
            border-radius: var(--border-radius);
        }
        .download-cta h3 {
            color: white;
            margin-top: 0;
        }
        .rating-widget form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .stars {
            display: flex;
            justify-content: center;
            gap: 10px;
            font-size: 1.8rem;
            color: #ddd;
            margin: 10px 0;
        }
        .stars i {
            cursor: pointer;
            transition: var(--transition);
        }
        .stars i:hover,
        .stars i.active {
            color: var(--warning);
        }
        .rating-widget input,
        .rating-widget textarea {
            padding: 12px 15px;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
        }
        .rating-widget textarea {
            min-height: 100px;
            resize: vertical;
        }
        .comments-section {
            background: white;
            padding: 40px;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin-bottom: 60px;
        }
        .comment-form {
            display: grid;
            gap: 20px;
            margin-bottom: 40px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .comment-form input,
        .comment-form textarea {
            padding: 15px;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .comment-form input:focus,
        .comment-form textarea:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(26, 111, 252, 0.2);
        }
        .comment-form textarea {
            min-height: 150px;
            resize: vertical;
        }
        .comment {
            display: flex;
            gap: 20px;
            padding: 25px 0;
            border-bottom: 1px solid #e9ecef;
        }
        .comment:last-child {
            border-bottom: none;
        }
        .comment-avatar {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--primary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            flex-shrink: 0;
        }
        .comment-content h4 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .comment-date {
            color: var(--gray);
            font-size: 0.9rem;
        }
        footer {
            background: var(--dark);
            color: #adb5bd;
            padding-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            padding-bottom: 40px;
        }
        .footer-col h3 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
        }
        .footer-col ul li {
            margin-bottom: 12px;
        }
        .footer-col a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #2d3748;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 15px;
        }
        .friend-links a {
            background: #2d3748;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 0.9rem;
        }
        .friend-links a:hover {
            background: var(--primary);
        }
        .copyright {
            text-align: center;
            padding: 25px;
            border-top: 1px solid #2d3748;
            font-size: 0.9rem;
            color: #6c757d;
        }
        @media (max-width: 1024px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 20px;
            }
            nav.active {
                display: block;
            }
            nav ul {
                flex-direction: column;
                gap: 0;
            }
            nav li {
                border-bottom: 1px solid #eee;
            }
            nav a {
                display: block;
                padding: 15px;
            }
            .search-box {
                width: 100%;
                order: 2;
                margin-top: 15px;
                display: none;
            }
            .search-box.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .hero {
                padding: 50px 20px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            main article,
            .comments-section,
            .sidebar-widget {
                padding: 25px 20px;
            }
            .link-list ul {
                grid-template-columns: 1fr;
            }
        }