:root {
            --primary-blue: #1a6bc4;
            --primary-green: #2ecc71;
            --accent-orange: #f39c12;
            --dark-bg: #0f172a;
            --light-bg: #f8fafc;
            --text-dark: #1e293b;
            --text-light: #64748b;
            --border-color: #e2e8f0;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: var(--light-bg);
            overflow-x: hidden;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-orange);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        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;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary-blue);
            background: linear-gradient(90deg, var(--primary-blue), var(--primary-green));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .my-logo i {
            font-size: 2.2rem;
            -webkit-text-fill-color: initial;
            color: var(--accent-orange);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 4px;
            background: none;
            border: none;
            padding: 5px;
        }
        .hamburger span {
            width: 25px;
            height: 3px;
            background-color: var(--text-dark);
            border-radius: 2px;
            transition: var(--transition);
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(7px, -6px);
        }
        nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
            align-items: center;
        }
        nav a {
            font-weight: 600;
            color: var(--text-dark);
            padding: 8px 5px;
            border-bottom: 2px solid transparent;
        }
        nav a:hover, nav a.active {
            color: var(--primary-blue);
            border-bottom-color: var(--primary-blue);
        }
        .breadcrumb {
            padding: 15px 20px;
            background-color: #f1f5f9;
            font-size: 0.9rem;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary-blue);
        }
        .breadcrumb span {
            color: var(--text-light);
            margin: 0 8px;
        }
        main {
            padding: 40px 0;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .content-area {
            background-color: white;
            padding: 40px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        aside {
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar-widget {
            background-color: white;
            padding: 25px;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin-bottom: 25px;
        }
        h1 {
            font-size: 2.8rem;
            color: var(--dark-bg);
            margin-bottom: 20px;
            line-height: 1.2;
            border-left: 5px solid var(--primary-green);
            padding-left: 20px;
        }
        h2 {
            font-size: 2rem;
            color: var(--primary-blue);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border-color);
        }
        h3 {
            font-size: 1.5rem;
            color: var(--text-dark);
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.2rem;
            color: var(--text-light);
            margin: 20px 0 10px;
        }
        p {
            margin-bottom: 20px;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            color: var(--text-light);
            background-color: #f0f9ff;
            padding: 20px;
            border-radius: var(--radius);
            border-left: 4px solid var(--primary-blue);
            margin-bottom: 30px;
        }
        .highlight {
            background-color: #fff9db;
            padding: 20px;
            border-radius: var(--radius);
            border: 2px dashed var(--accent-orange);
            margin: 25px 0;
        }
        .tip {
            background-color: #e8f5e9;
            padding: 15px;
            border-radius: var(--radius);
            margin: 15px 0;
            display: flex;
            align-items: flex-start;
            gap: 10px;
        }
        .tip i {
            color: var(--primary-green);
            font-size: 1.2rem;
            margin-top: 3px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        input, select, textarea {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            font-family: inherit;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, select:focus, textarea:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(26, 107, 196, 0.1);
        }
        button, .btn {
            background-color: var(--primary-blue);
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: var(--radius);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }
        button:hover, .btn:hover {
            background-color: #1557a3;
            transform: translateY(-2px);
        }
        .rating-stars {
            display: flex;
            gap: 5px;
            margin-bottom: 15px;
        }
        .rating-stars i {
            color: #ddd;
            cursor: pointer;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        .rating-stars i:hover, .rating-stars i.active {
            color: #ffc107;
        }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 15px;
            margin: 30px 0;
        }
        .link-card {
            background-color: white;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 15px;
            transition: var(--transition);
        }
        .link-card:hover {
            border-color: var(--primary-blue);
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 20px;
            border-bottom: 2px solid var(--primary-blue);
            padding-bottom: 10px;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #cbd5e1;
        }
        .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: 20px;
            margin: 5px;
            font-size: 0.9rem;
        }
        friend-link a {
            color: #7dd3fc;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        @media (max-width: 1024px) {
            main {
                grid-template-columns: 1fr;
            }
            aside {
                position: static;
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .hamburger {
                display: flex;
            }
            nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background-color: white;
                position: absolute;
                top: 100%;
                left: 0;
                box-shadow: var(--shadow);
                padding: 20px;
                gap: 15px;
            }
            nav ul.active {
                display: flex;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .content-area {
                padding: 25px;
            }
            .related-links {
                grid-template-columns: 1fr;
            }
            aside {
                grid-template-columns: 1fr;
            }
        }