* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #2d3748;
            background-color: #f7fafc;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        a {
            text-decoration: none;
            color: #3182ce;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #2b6cb0;
            text-decoration: underline;
        }
        header {
            background: linear-gradient(135deg, #1a365d 0%, #2d3748 100%);
            color: white;
            padding: 1.2rem 0;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a.my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: white;
            display: flex;
            align-items: center;
            gap: 12px;
            letter-spacing: 1px;
        }
        .logo i {
            color: #63b3ed;
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-desktop {
            display: flex;
            list-style: none;
            gap: 28px;
        }
        .nav-desktop a {
            color: #e2e8f0;
            font-weight: 600;
            padding: 8px 16px;
            border-radius: 6px;
            transition: all 0.3s;
        }
        .nav-desktop a:hover {
            background-color: #4a5568;
            text-decoration: none;
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
            padding: 8px;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            list-style: none;
            background-color: #2d3748;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 20px;
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
            border-top: 3px solid #63b3ed;
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile li {
            margin: 12px 0;
        }
        .nav-mobile a {
            color: #e2e8f0;
            display: block;
            padding: 12px;
            border-radius: 6px;
            font-weight: 600;
        }
        .nav-mobile a:hover {
            background-color: #4a5568;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 14px 0;
            font-size: 0.95rem;
        }
        .breadcrumb ul {
            display: flex;
            list-style: none;
            flex-wrap: wrap;
            gap: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 10px;
            color: #718096;
        }
        main {
            padding: 40px 0;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
            margin: 30px auto;
            max-width: 1100px;
        }
        article {
            padding: 0 30px;
        }
        h1 {
            font-size: 3.2rem;
            color: #1a365d;
            margin-bottom: 24px;
            line-height: 1.2;
            border-bottom: 4px solid #63b3ed;
            padding-bottom: 20px;
        }
        h2 {
            font-size: 2.4rem;
            color: #2d3748;
            margin-top: 48px;
            margin-bottom: 24px;
            padding-bottom: 12px;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            font-size: 1.8rem;
            color: #4a5568;
            margin-top: 36px;
            margin-bottom: 18px;
        }
        h4 {
            font-size: 1.4rem;
            color: #718096;
            margin-top: 28px;
            margin-bottom: 14px;
            font-style: italic;
        }
        p {
            margin-bottom: 22px;
            text-align: justify;
            font-size: 1.1rem;
        }
        .highlight-box {
            background: linear-gradient(120deg, #ebf8ff 0%, #e6fffa 100%);
            border-left: 6px solid #38b2ac;
            padding: 24px;
            margin: 32px 0;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        }
        .update-time {
            background-color: #fed7d7;
            color: #742a2a;
            padding: 12px 20px;
            border-radius: 8px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: bold;
            margin-bottom: 30px;
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: 12px;
            margin: 36px 0;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            transition: transform 0.5s ease;
        }
        .featured-image:hover {
            transform: scale(1.01);
        }
        .resource-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
            margin: 40px 0;
        }
        .resource-card {
            background: white;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 24px;
            transition: all 0.3s;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
        }
        .resource-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
            border-color: #63b3ed;
        }
        .resource-card h4 {
            color: #2d3748;
            margin-top: 0;
        }
        .interactive-section {
            background: #f8f9fa;
            border-radius: 12px;
            padding: 36px;
            margin: 50px 0;
            border: 1px solid #dee2e6;
        }
        form {
            display: grid;
            gap: 22px;
            max-width: 600px;
            margin-top: 28px;
        }
        input, textarea, select {
            padding: 16px;
            border: 2px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            border-color: #3182ce;
            outline: none;
            box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.2);
        }
        button {
            padding: 16px 30px;
            background: linear-gradient(90deg, #3182ce 0%, #2b6cb0 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        button:hover {
            background: linear-gradient(90deg, #2b6cb0 0%, #2c5282 100%);
            transform: translateY(-3px);
            box-shadow: 0 6px 12px rgba(43, 108, 176, 0.3);
        }
        .rating-stars {
            display: flex;
            gap: 10px;
            font-size: 1.8rem;
            color: #e2e8f0;
            margin: 15px 0;
        }
        .rating-stars .star {
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating-stars .star:hover,
        .rating-stars .star.active {
            color: #f6ad55;
        }
        footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 50px 0 30px;
            margin-top: 60px;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-section h3 {
            color: #e2e8f0;
            font-size: 1.5rem;
            margin-bottom: 24px;
            border-bottom: 2px solid #4a5568;
            padding-bottom: 10px;
        }
        friend-link {
            display: block;
            margin-bottom: 14px;
        }
        friend-link a {
            color: #a0aec0;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: color 0.3s;
        }
        friend-link a:hover {
            color: #63b3ed;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #4a5568;
            font-size: 0.95rem;
            color: #a0aec0;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.8rem; }
            h2 { font-size: 2.1rem; }
            .nav-desktop { display: none; }
            .hamburger { display: block; }
            .resource-links { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.9rem; }
            article { padding: 0 20px; }
            .interactive-section { padding: 24px; }
            .footer-content { grid-template-columns: 1fr; }
        }