* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background-color: #f8f9fa;
            color: #2c3e50;
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            text-decoration: none;
            color: #2980b9;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #1a5276;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul, ol {
            padding-left: 1.5rem;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .text-center { text-align: center; }
        .bold { font-weight: 700; }
        .emoji { font-size: 1.2em; }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 1rem 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;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            color: #4fc3f7;
            letter-spacing: -1px;
        }
        .my-logo a {
            color: inherit;
        }
        .my-logo span {
            color: #ffeb3b;
        }
        .breadcrumb {
            background-color: #e3f2fd;
            padding: 12px 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            padding-left: 0;
            flex-wrap: wrap;
        }
        .breadcrumb li {
            margin-right: 10px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin-left: 10px;
            color: #666;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            color: #e3f2fd;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 4px;
        }
        .nav-desktop a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            color: #ffeb3b;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: #283593;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            color: white;
            padding: 12px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .nav-mobile a:hover {
            background-color: rgba(255,255,255,0.1);
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        aside {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #4fc3f7;
            padding-bottom: 15px;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.5rem 0 1rem;
            padding-top: 10px;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        .lead {
            font-size: 1.3rem;
            color: #555;
            font-weight: 300;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fffde7;
            border-left: 4px solid #ffeb3b;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .featured-image {
            width: 100%;
            border-radius: 10px;
            margin: 2rem auto;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .module {
            background: #f1f8ff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2.5rem 0;
        }
        .module h3 {
            margin-top: 0;
            color: #1565c0;
        }
        form {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        input, textarea, select {
            padding: 12px 15px;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            border-color: #3498db;
            outline: none;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
        }
        button, .btn {
            background: linear-gradient(to right, #2980b9, #2c3e50);
            color: white;
            border: none;
            padding: 14px 20px;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        button:hover, .btn:hover {
            background: linear-gradient(to right, #2573a7, #1a2536);
            transform: translateY(-2px);
            box-shadow: 0 5px 12px rgba(0,0,0,0.15);
        }
        .star-rating {
            display: flex;
            gap: 5px;
            margin: 10px 0;
        }
        .star-rating input { display: none; }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: #ffc107;
        }
        .star-rating input:checked ~ label {
            color: #ffc107;
        }
        .internal-links {
            background: #e8f4fc;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
        }
        .internal-links h4 {
            margin-top: 0;
        }
        .internal-links ul {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 10px;
            list-style: none;
            padding-left: 0;
        }
        .internal-links li {
            padding: 8px 0;
            border-bottom: 1px dashed #b3e5fc;
        }
        footer {
            background: #1a237e;
            color: #e3f2fd;
            padding: 3rem 0 2rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #4fc3f7;
            margin-bottom: 1.2rem;
            font-size: 1.3rem;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #90caf9;
        }
        friend-link {
            display: block;
            margin: 10px 0;
        }
        friend-link a {
            color: #bbdefb;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-desktop { display: none; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            article, aside { padding: 1.5rem; }
            .header-content {
                flex-wrap: wrap;
            }
        }