* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        :root {
            --primary: #4361ee;
            --secondary: #3a0ca3;
            --accent: #f72585;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --transition: all 0.3s ease;
        }
        body {
            background-color: #fefefe;
            color: var(--dark);
            line-height: 1.6;
            overflow-x: hidden;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 1.5rem 0;
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            letter-spacing: -1px;
            color: white;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo span {
            color: #ffd166;
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 12px 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            margin-right: 8px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 8px;
            color: var(--gray);
        }
        .nav-container {
            display: flex;
            align-items: center;
        }
        .main-nav {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 8px 0;
            position: relative;
        }
        .main-nav a:hover {
            color: #ffd166;
        }
        .main-nav a::after {
            content: '';
            position: absolute;
            width: 0;
            height: 3px;
            background: #ffd166;
            bottom: 0;
            left: 0;
            transition: width 0.3s;
        }
        .main-nav a:hover::after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .hero {
            background: linear-gradient(rgba(67, 97, 238, 0.9), rgba(58, 12, 163, 0.9)), url('https://images.unsplash.com/photo-1635070041078-e363dbe005cb?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
            color: white;
            padding: 4rem 0;
            text-align: center;
            border-radius: 0 0 var(--radius) var(--radius);
            margin-bottom: 3rem;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
        }
        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            opacity: 0.95;
        }
        main {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 3rem;
            padding: 2rem 0 4rem;
        }
        @media (max-width: 992px) {
            main {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            border-radius: var(--radius);
            overflow: hidden;
        }
        .article-content {
            padding: 2.5rem;
        }
        h1 { font-size: 2.8rem; margin-bottom: 1.5rem; color: var(--dark); }
        h2 { font-size: 2.2rem; margin: 2.5rem 0 1.2rem; padding-bottom: 0.5rem; border-bottom: 3px solid var(--primary); color: var(--secondary); }
        h3 { font-size: 1.8rem; margin: 2rem 0 1rem; color: var(--dark); }
        h4 { font-size: 1.4rem; margin: 1.5rem 0 0.8rem; color: var(--gray); }
        p { margin-bottom: 1.5rem; font-size: 1.1rem; }
        strong { color: var(--secondary); font-weight: 700; }
        em { color: var(--accent); font-style: italic; }
        .intro {
            font-size: 1.25rem;
            background: #f0f4ff;
            padding: 1.5rem;
            border-left: 5px solid var(--primary);
            border-radius: var(--radius);
            margin-bottom: 2.5rem;
        }
        .word-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            margin: 2rem 0;
            padding: 1.5rem;
            background: #f8f9ff;
            border-radius: var(--radius);
        }
        .word-card {
            background: white;
            padding: 15px;
            border-radius: 8px;
            text-align: center;
            font-weight: 600;
            box-shadow: 0 2px 5px rgba(0,0,0,0.05);
            transition: var(--transition);
            border: 2px solid transparent;
        }
        .word-card:hover {
            border-color: var(--accent);
            transform: translateY(-5px);
        }
        .difficulty {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .easy { background: #d4edda; color: #155724; }
        .medium { background: #fff3cd; color: #856404; }
        .hard { background: #f8d7da; color: #721c24; }
        .article-img {
            width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .caption {
            text-align: center;
            font-style: italic;
            color: var(--gray);
            margin-top: -1.5rem;
            margin-bottom: 2rem;
        }
        aside {
            background: #f8f9ff;
            border-radius: var(--radius);
            padding: 2rem;
            height: fit-content;
            box-shadow: var(--shadow);
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar-widget h3 {
            font-size: 1.5rem;
            margin-bottom: 1.2rem;
            color: var(--primary);
        }
        .link-list {
            list-style: none;
        }
        .link-list li {
            margin-bottom: 12px;
            padding-bottom: 12px;
            border-bottom: 1px dashed #dee2e6;
        }
        .link-list a {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .link-list i {
            color: var(--accent);
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }
        button, .btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: 8px;
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            background: var(--secondary);
            transform: translateY(-3px);
        }
        .rating {
            display: flex;
            gap: 10px;
            margin: 1rem 0;
        }
        .star {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #ffc107;
        }
        footer {
            background: var(--dark);
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 3rem;
        }
        @media (max-width: 768px) {
            .footer-container {
                grid-template-columns: 1fr;
            }
        }
        .footer-col h3 {
            color: #ffd166;
            margin-bottom: 1.5rem;
            font-size: 1.4rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: #adb5bd;
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            margin: 1rem 0;
            padding: 15px;
            background: rgba(255,255,255,0.05);
            border-radius: 8px;
            color: #adb5bd;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #495057;
            color: #adb5bd;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: 90px;
                left: 0;
                width: 100%;
                background: var(--secondary);
                flex-direction: column;
                align-items: center;
                padding: 2rem 0;
                gap: 1.5rem;
                clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
                transition: clip-path 0.4s ease;
                box-shadow: var(--shadow);
            }
            .main-nav.active {
                clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
            }
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1.1rem;
            }
            h1 { font-size: 2.3rem; }
            h2 { font-size: 1.9rem; }
            .article-content {
                padding: 1.5rem;
            }
        }
        .update-time {
            font-size: 0.9rem;
            color: var(--gray);
            text-align: right;
            margin-bottom: 1rem;
            font-style: italic;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fff9db, #ffec99);
            border-left: 5px solid #ffd43b;
            padding: 1.5rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .quote {
            font-size: 1.2rem;
            color: var(--secondary);
            font-style: italic;
            text-align: center;
            max-width: 800px;
            margin: 2.5rem auto;
            padding: 2rem;
            border-top: 2px solid var(--primary);
            border-bottom: 2px solid var(--primary);
        }
        .emoji {
            font-size: 1.3rem;
            margin-right: 8px;
        }