* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            line-height: 1.7;
            color: #2c3e50;
            background-color: #f8f9fa;
            max-width: 100vw;
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { color: #1a5276; font-weight: 700; line-height: 1.3; margin-bottom: 0.75rem; }
        h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); margin-top: 1.5rem; border-bottom: 3px solid #e74c3c; padding-bottom: 0.5rem; }
        h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-top: 2.5rem; padding-left: 0.5rem; border-left: 5px solid #27ae60; }
        h3 { font-size: 1.6rem; margin-top: 2rem; color: #2980b9; }
        h4 { font-size: 1.3rem; margin-top: 1.5rem; color: #8e44ad; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        a { color: #3498db; text-decoration: none; transition: color 0.3s ease, border-bottom 0.3s ease; }
        a:hover { color: #e74c3c; border-bottom: 1px dashed #e74c3c; }
        strong { color: #c0392b; font-weight: 700; }
        em { font-style: italic; color: #7f8c8d; }
        blockquote { border-left: 4px solid #f1c40f; padding-left: 1.5rem; margin: 2rem 0; font-style: italic; color: #555; background-color: #fef9e7; padding: 1.5rem; border-radius: 0 8px 8px 0; }
        ul, ol { margin-bottom: 1.5rem; padding-left: 2rem; }
        li { margin-bottom: 0.5rem; }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin-top: 2rem;
        }
        @media (max-width: 992px) {
            .content-wrapper { grid-template-columns: 1fr; }
        }
        .site-header {
            background: linear-gradient(135deg, #1a5276 0%, #2c3e50 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-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-family: 'Georgia', serif;
            font-size: 2.2rem;
            font-weight: 800;
            color: #f1c40f;
            text-transform: uppercase;
            letter-spacing: 1px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .my-logo a { color: inherit; border: none; }
        .my-logo a:hover { color: #fff; border: none; }
        .logo-sub { font-size: 0.8rem; color: #bdc3c7; letter-spacing: normal; text-transform: none; display: block; }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop { display: none; }
        }
        .nav-desktop a {
            color: #ecf0f1;
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:hover { color: #f1c40f; }
        .nav-desktop a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #f1c40f;
            transition: width 0.3s ease;
        }
        .nav-desktop a:hover:after { width: 100%; }
        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        @media (max-width: 768px) {
            .hamburger-btn { display: block; }
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: #2c3e50;
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            box-shadow: 0 5px 10px rgba(0,0,0,0.2);
            z-index: 999;
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a {
            color: #ecf0f1;
            padding: 1rem;
            border-bottom: 1px solid #34495e;
        }
        .nav-mobile a:last-child { border-bottom: none; }
        .nav-mobile a:hover { background-color: #34495e; color: #f1c40f; }
        .breadcrumb {
            background-color: #ecf0f1;
            padding: 0.8rem 1.5rem;
            font-size: 0.9rem;
            margin-top: 1px;
        }
        .breadcrumb a { color: #7f8c8d; }
        .breadcrumb a:hover { color: #e74c3c; }
        .breadcrumb span { color: #95a5a6; }
        main { padding: 2rem 0; background-color: white; border-radius: 8px; box-shadow: 0 5px 15px rgba(0,0,0,0.05); margin-bottom: 2rem; }
        .article-content { padding: 0 2rem; }
        @media (max-width: 576px) {
            .article-content { padding: 0 1rem; }
        }
        .feature-img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            border-radius: 8px;
            margin: 2rem 0;
            box-shadow: 0 8px 20px rgba(0,0,0,0.15);
            transition: transform 0.5s ease;
        }
        .feature-img:hover { transform: scale(1.01); }
        .sidebar {
            background-color: #f1f8ff;
            padding: 1.5rem;
            border-radius: 8px;
            border-left: 5px solid #3498db;
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 { color: #1a5276; margin-top: 0; }
        .sidebar ul { list-style: none; padding-left: 0; }
        .sidebar li { margin-bottom: 0.8rem; }
        .sidebar a { color: #2c3e50; display: block; padding: 0.3rem 0; }
        .sidebar a:hover { color: #e74c3c; padding-left: 5px; }
        .interactive-module {
            background: linear-gradient(to right, #f8f9fa, #e8f4fc);
            border: 1px solid #d6eaf8;
            border-radius: 10px;
            padding: 2rem;
            margin: 3rem 0;
            box-shadow: 0 6px 12px rgba(52, 152, 219, 0.1);
        }
        .module-title { text-align: center; margin-bottom: 1.5rem; color: #1a5276; }
        .form-group { margin-bottom: 1.2rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #2c3e50; }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s ease, box-shadow 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        button {
            background: linear-gradient(to right, #27ae60, #2ecc71);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 6px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: block;
            width: 100%;
        }
        button:hover {
            background: linear-gradient(to right, #229954, #27ae60);
            box-shadow: 0 5px 15px rgba(39, 174, 96, 0.4);
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            justify-content: center;
            gap: 0.5rem;
            font-size: 1.8rem;
            margin: 1rem 0;
            color: #f1c40f;
            cursor: pointer;
        }
        .star-rating .star:hover { transform: scale(1.2); }
        .site-footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 { color: #f1c40f; margin-top: 0; }
        .footer-section a { color: #bdc3c7; display: block; margin-bottom: 0.5rem; }
        .footer-section a:hover { color: #f1c40f; }
        friend-link {
            display: block;
            background-color: #34495e;
            padding: 1rem;
            border-radius: 6px;
            margin-bottom: 0.8rem;
            border-left: 4px solid #3498db;
            transition: transform 0.3s ease;
        }
        friend-link:hover { transform: translateX(5px); }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        .text-center { text-align: center; }
        .mt-2 { margin-top: 2rem; }
        .mb-2 { margin-bottom: 2rem; }
        .p-2 { padding: 2rem; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        .last-updated { font-size: 0.9rem; color: #7f8c8d; text-align: right; margin-top: 2rem; font-style: italic; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .clearfix::after { content: ""; clear: both; display: table; }