* {
            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;
            max-width: 100vw;
            overflow-x: hidden;
        }
        a {
            color: #2c5aa0;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #1a3d6f;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul, ol {
            margin-left: 1.5em;
            margin-bottom: 1.5em;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .py-1 { padding-top: 1em; padding-bottom: 1em; }
        .py-2 { padding-top: 2em; padding-bottom: 2em; }
        .my-2 { margin-top: 2em; margin-bottom: 2em; }
        .text-center { text-align: center; }
        .text-primary { color: #2c5aa0; }
        .bg-white { background-color: #fff; }
        .shadow { box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
        .rounded { border-radius: 8px; }
        .site-header {
            background: linear-gradient(135deg, #1a3d6f 0%, #2c5aa0 100%);
            color: white;
            padding: 1em 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            letter-spacing: 1px;
            text-transform: uppercase;
            background: linear-gradient(to right, #ffd700, #ffec8b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        .my-logo:hover {
            text-shadow: 0 2px 8px rgba(255, 215, 0, 0.4);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.8em;
        }
        .main-nav a {
            color: #fff;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5em 0.2em;
            border-bottom: 2px solid transparent;
        }
        .main-nav a:hover,
        .main-nav a.active {
            border-bottom-color: #ffd700;
            color: #ffd700;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 0.8em 20px;
            font-size: 0.9rem;
            border-bottom: 1px solid #dee2e6;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #1a3d6f; }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5em;
            padding: 2em 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: white;
            padding: 2.5em;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.07);
        }
        .sidebar {
            background: white;
            padding: 1.5em;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.07);
        }
        .sidebar h3 {
            border-bottom: 2px solid #2c5aa0;
            padding-bottom: 0.5em;
            margin-bottom: 1em;
            color: #1a3d6f;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a3d6f;
            margin-bottom: 0.8em;
            line-height: 1.2;
        }
        h2 {
            font-size: 2.1rem;
            color: #2c5aa0;
            margin-top: 2em;
            margin-bottom: 0.8em;
            padding-bottom: 0.3em;
            border-bottom: 2px solid #e9ecef;
        }
        h3 {
            font-size: 1.7rem;
            color: #333;
            margin-top: 1.8em;
            margin-bottom: 0.6em;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
            margin-top: 1.5em;
            margin-bottom: 0.5em;
        }
        p {
            margin-bottom: 1.5em;
            text-align: justify;
        }
        strong {
            color: #1a3d6f;
        }
        blockquote {
            border-left: 5px solid #2c5aa0;
            background-color: #f0f5ff;
            padding: 1.5em;
            margin: 2em 0;
            font-style: italic;
            border-radius: 0 8px 8px 0;
        }
        .highlight-box {
            background: linear-gradient(to right, #f0f5ff, #e6f0ff);
            border-left: 5px solid #2c5aa0;
            padding: 1.5em;
            margin: 2em 0;
            border-radius: 0 8px 8px 0;
        }
        .feature-form {
            background: #f8f9fa;
            padding: 1.5em;
            border-radius: 8px;
            margin: 2em 0;
            border: 1px solid #dee2e6;
        }
        .feature-form h3 {
            margin-top: 0;
            color: #2c5aa0;
        }
        .form-group {
            margin-bottom: 1.2em;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5em;
            font-weight: 600;
            color: #555;
        }
        .form-control {
            width: 100%;
            padding: 0.8em 1em;
            border: 1px solid #ced4da;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            border-color: #2c5aa0;
            outline: none;
            box-shadow: 0 0 0 3px rgba(44, 90, 160, 0.1);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #2c5aa0, #1a3d6f);
            color: white;
            padding: 0.8em 2em;
            border: none;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn:hover {
            background: linear-gradient(to right, #1a3d6f, #12315c);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        .star-rating {
            display: flex;
            gap: 0.5em;
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
            margin: 0.5em 0;
        }
        .star-rating .star:hover,
        .star-rating .star.active {
            color: #ffc107;
        }
        .featured-image {
            margin: 2.5em 0;
            text-align: center;
        }
        .featured-image img {
            border-radius: 12px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
            border: 1px solid #dee2e6;
        }
        .image-caption {
            font-style: italic;
            color: #666;
            margin-top: 0.8em;
            font-size: 0.95rem;
        }
        .toc {
            background: #f0f5ff;
            padding: 1.5em 2em;
            border-radius: 8px;
            margin-bottom: 2.5em;
        }
        .toc h3 {
            margin-top: 0;
        }
        .toc ul {
            list-style: none;
            margin-left: 0;
        }
        .toc li {
            margin-bottom: 0.8em;
        }
        .toc a {
            color: #2c5aa0;
            font-weight: 500;
        }
        .toc a:hover {
            text-decoration: underline;
        }
        .internal-links {
            background: #f8f9fa;
            padding: 1.5em;
            border-radius: 8px;
            margin: 2em 0;
        }
        .internal-links ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 1em;
            margin-bottom: 0;
        }
        .internal-links li {
            background: white;
            padding: 0.8em 1.2em;
            border-radius: 6px;
            border: 1px solid #dee2e6;
            transition: transform 0.3s;
        }
        .internal-links li:hover {
            transform: translateY(-3px);
            border-color: #2c5aa0;
        }
        .site-footer {
            background: #1a3d6f;
            color: white;
            padding: 3em 0 1.5em;
            margin-top: 3em;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2em;
        }
        .footer-section h4 {
            color: #ffd700;
            margin-top: 0;
            border-bottom: none;
        }
        .footer-section a {
            color: #ccc;
        }
        .footer-section a:hover {
            color: #ffd700;
        }
        friend-link {
            display: block;
            margin: 0.5em 0;
            padding: 0.5em 0;
            border-bottom: 1px dashed rgba(255,255,255,0.1);
        }
        .copyright {
            text-align: center;
            margin-top: 3em;
            padding-top: 1.5em;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: #aaa;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav ul {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1a3d6f;
                position: absolute;
                top: 100%;
                left: 0;
                padding: 1em;
                gap: 0;
                border-top: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav ul.active {
                display: flex;
            }
            .main-nav li {
                margin: 0.5em 0;
            }
            .main-nav a {
                display: block;
                padding: 0.8em;
                border-left: 3px solid transparent;
                border-bottom: none;
            }
            .main-nav a:hover {
                border-left-color: #ffd700;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            .article-content {
                padding: 1.5em;
            }
            .header-container {
                padding: 0 15px;
            }
        }