* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background-color: #f8f9fa;
            overflow-x: hidden;
        }
        a {
            color: #2c5282;
            text-decoration: none;
            transition: color 0.3s ease, background-color 0.3s ease;
        }
        a:hover {
            color: #1a365d;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
            color: #fff;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo a {
            font-size: 2.2rem;
            font-weight: 900;
            color: #63b3ed;
            text-decoration: none;
            font-family: 'Trebuchet MS', sans-serif;
            letter-spacing: 1px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo a:hover {
            color: #90cdf4;
            text-decoration: none;
        }
        .my-logo i {
            font-size: 2.5rem;
        }
        .breadcrumb {
            padding: 1rem 0;
            background-color: #edf2f7;
            font-size: 0.9rem;
            color: #4a5568;
        }
        .breadcrumb a {
            color: #4a5568;
        }
        .breadcrumb a:hover {
            color: #2d3748;
        }
        .breadcrumb span.separator {
            margin: 0 8px;
            color: #a0aec0;
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-list a {
            color: #cbd5e0;
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
        }
        .nav-list a:hover {
            color: #fff;
            background-color: rgba(255,255,255,0.1);
            text-decoration: none;
        }
        .nav-list a.active {
            color: #63b3ed;
            background-color: rgba(99, 179, 237, 0.1);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: #cbd5e0;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: #2d3748;
                padding: 1rem 0;
                box-shadow: 0 5px 10px rgba(0,0,0,0.2);
                gap: 0;
            }
            .nav-list.show {
                display: flex;
            }
            .nav-list li {
                width: 100%;
            }
            .nav-list a {
                display: block;
                padding: 1rem 2rem;
                border-bottom: 1px solid #4a5568;
            }
        }
        .hero {
            background: linear-gradient(rgba(26, 32, 44, 0.85), rgba(45, 55, 72, 0.9)), url('https://images.unsplash.com/photo-1550745165-9bc0b252726f?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 4rem 2rem;
            text-align: center;
            border-radius: 0 0 12px 12px;
            margin-bottom: 3rem;
        }
        .hero h1 {
            font-size: 3.2rem;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.5);
        }
        .hero p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            color: #e2e8f0;
        }
        .last-updated {
            font-style: italic;
            color: #a0aec0;
            font-size: 0.95rem;
            margin-top: 1rem;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin-bottom: 3rem;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
        }
        main article {
            background: white;
            border-radius: 12px;
            padding: 3rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
        }
        aside.sidebar {
            background: white;
            border-radius: 12px;
            padding: 2rem;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1, h2, h3, h4 {
            color: #2d3748;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 {
            font-size: 3.2rem;
            border-bottom: 4px solid #63b3ed;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2.3rem;
            color: #2c5282;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #cbd5e0;
        }
        h3 {
            font-size: 1.8rem;
            color: #4a5568;
        }
        h4 {
            font-size: 1.4rem;
            color: #718096;
        }
        p, li {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            color: #4a5568;
        }
        ul, ol {
            padding-left: 2rem;
            margin-bottom: 1.5rem;
        }
        strong {
            color: #2d3748;
            font-weight: 700;
        }
        em {
            color: #805ad5;
            font-style: italic;
        }
        .intro-emoji {
            font-size: 1.5rem;
            margin-right: 8px;
        }
        .highlight-box {
            background: linear-gradient(135deg, #e6fffa 0%, #ebf8ff 100%);
            border-left: 6px solid #38b2ac;
            padding: 2rem;
            border-radius: 0 8px 8px 0;
            margin: 2.5rem 0;
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #718096;
            font-size: 0.95rem;
            margin-top: 0.5rem;
            margin-bottom: 2rem;
        }
        .related-term {
            background-color: #fefcbf;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
            color: #744210;
        }
        .interactive-module {
            background: #f7fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 2rem;
            margin: 2.5rem 0;
        }
        .interactive-module h3 {
            margin-top: 0;
            color: #2d3748;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interactive-module h3 i {
            color: #63b3ed;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1.2rem;
        }
        input, textarea, select {
            padding: 0.85rem 1rem;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s ease, box-shadow 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #63b3ed;
            box-shadow: 0 0 0 3px rgba(99, 179, 237, 0.2);
        }
        button, .btn {
            background: linear-gradient(135deg, #4299e1 0%, #3182ce 100%);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            background: linear-gradient(135deg, #3182ce 0%, #2b6cb0 100%);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(49, 130, 206, 0.3);
            text-decoration: none;
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 2rem;
            color: #e2e8f0;
            cursor: pointer;
            transition: color 0.2s ease;
        }
        .rating-stars input:checked ~ label,
        .rating-stars label:hover,
        .rating-stars label:hover ~ label {
            color: #f6e05e;
        }
        .widget {
            margin-bottom: 2.5rem;
        }
        .widget-title {
            font-size: 1.4rem;
            color: #2d3748;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid #63b3ed;
            margin-bottom: 1.5rem;
        }
        .link-list {
            list-style: none;
            padding-left: 0;
        }
        .link-list li {
            margin-bottom: 0.8rem;
            padding-left: 1.5rem;
            position: relative;
        }
        .link-list li:before {
            content: '➤';
            position: absolute;
            left: 0;
            color: #63b3ed;
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag {
            background: #edf2f7;
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-size: 0.9rem;
            color: #4a5568;
            transition: all 0.3s ease;
        }
        .tag:hover {
            background: #63b3ed;
            color: white;
            transform: translateY(-2px);
        }
        .site-footer {
            background: #1a202c;
            color: #cbd5e0;
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-logo {
            font-size: 2rem;
            font-weight: 900;
            color: #63b3ed;
            margin-bottom: 1rem;
        }
        .footer-heading {
            color: #fff;
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #4a5568;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #90cdf4;
        }
        friend-link a:hover {
            color: #63b3ed;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #2d3748;
            font-size: 0.95rem;
            color: #a0aec0;
        }