* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            padding: 0;
            margin: 0;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a { text-decoration: none; color: #2c3e50; transition: color 0.3s; }
        a:hover { color: #e74c3c; }
        ul, ol { padding-left: 20px; margin-bottom: 1rem; }
        img { max-width: 100%; height: auto; display: block; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .py-1 { padding-top: 1rem; padding-bottom: 1rem; }
        .py-2 { padding-top: 2rem; padding-bottom: 2rem; }
        .mb-1 { margin-bottom: 1rem; }
        .mb-2 { margin-bottom: 2rem; }
        .text-center { text-align: center; }
        .text-bold { font-weight: 700; }
        .highlight { background-color: #fffacd; padding: 2px 4px; border-radius: 3px; }
        .site-header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 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-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            color: #ffeb3b;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
            padding: 5px 10px;
            border-radius: 8px;
            background: rgba(255,255,255,0.1);
            transition: all 0.3s;
        }
        .my-logo:hover {
            background: rgba(255,255,255,0.2);
            transform: scale(1.05);
        }
        .nav-desktop {
            display: flex;
            gap: 1.5rem;
        }
        .nav-desktop a {
            color: white;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 5px;
        }
        .nav-desktop a:hover {
            background-color: rgba(255,255,255,0.2);
            color: #ffeb3b;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: #1a237e;
            padding: 1rem;
            border-radius: 0 0 10px 10px;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            box-shadow: 0 8px 16px 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:last-child { border-bottom: none; }
        .breadcrumb {
            background-color: #f8f9fa;
            padding: 0.8rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #dee2e6;
        }
        .breadcrumb a { color: #6c757d; }
        .breadcrumb a:hover { color: #e74c3c; }
        .breadcrumb span { color: #495057; }
        .main-content {
            flex: 1;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content { grid-template-columns: 1fr; }
        }
        .article-area {
            background-color: white;
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        .sidebar {
            background-color: white;
            border-radius: 15px;
            padding: 1.5rem;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            align-self: start;
        }
        .search-box {
            margin-bottom: 2rem;
        }
        .search-form {
            display: flex;
        }
        .search-input {
            flex: 1;
            padding: 12px 15px;
            border: 2px solid #3949ab;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-button {
            background-color: #3949ab;
            color: white;
            border: none;
            padding: 12px 20px;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-button:hover {
            background-color: #283593;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 4px solid #ffeb3b;
            padding-bottom: 10px;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            padding-left: 10px;
            border-left: 5px solid #e74c3c;
        }
        h3 {
            font-size: 1.5rem;
            color: #3949ab;
            margin-top: 2rem;
            margin-bottom: 0.8rem;
        }
        h4 {
            font-size: 1.2rem;
            color: #5c6bc0;
            margin-top: 1.5rem;
            margin-bottom: 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
        }
        .intro {
            font-size: 1.2rem;
            color: #555;
            background-color: #f9f9f9;
            padding: 1.5rem;
            border-radius: 10px;
            margin-bottom: 2rem;
            border-left: 5px solid #4caf50;
        }
        .image-container {
            margin: 2rem auto;
            text-align: center;
        }
        .feature-img {
            border-radius: 12px;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            transition: transform 0.5s;
        }
        .feature-img:hover {
            transform: scale(1.02);
        }
        .caption {
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
        }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #e74c3c, #c0392b);
            color: white;
            padding: 12px 24px;
            border-radius: 8px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.3s;
        }
        .btn:hover {
            background: linear-gradient(to right, #c0392b, #a93226);
            box-shadow: 0 6px 12px rgba(231, 76, 60, 0.3);
        }
        .interactive-section {
            margin-top: 3rem;
            padding: 2rem;
            background-color: #f8f9fa;
            border-radius: 12px;
            border: 1px solid #dee2e6;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        input, textarea, select {
            width: 100%;
            padding: 12px;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            border-color: #3949ab;
            outline: none;
        }
        .star-rating {
            display: flex;
            gap: 5px;
            font-size: 1.8rem;
            color: #ffc107;
            cursor: pointer;
        }
        .star-rating span:hover { color: #ff9800; }
        .site-footer {
            background: linear-gradient(90deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
        }
        .footer-section h3 {
            color: #ffeb3b;
            margin-bottom: 1rem;
            font-size: 1.3rem;
        }
        .footer-links a {
            display: block;
            color: #ddd;
            padding: 5px 0;
        }
        .footer-links a:hover { color: #ffeb3b; }
        friend-link {
            display: block;
            background-color: rgba(255,255,255,0.1);
            padding: 1rem;
            border-radius: 8px;
            margin-top: 1rem;
        }
        friend-link a {
            color: #ffeb3b;
            font-weight: 600;
        }
        .copyright {
            text-align: center;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px solid rgba(255,255,255,0.2);
            font-size: 0.9rem;
            color: #ccc;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-desktop { display: none; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            h3 { font-size: 1.3rem; }
            .article-area, .sidebar { padding: 1.5rem; }
            .header-inner { flex-wrap: wrap; }
        }