* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            padding-bottom: 2rem;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: #2a5db0; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #e63946; }
        .site-header {
            background: linear-gradient(90deg, #1d2b64 0%, #2a5db0 50%, #1d2b64 100%);
            color: white;
            padding: 1.5rem 1rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1.5rem;
        }
        .my-logo {
            font-family: 'Impact', 'Arial Black', sans-serif;
            font-size: 2.8rem;
            letter-spacing: 2px;
            background: linear-gradient(to right, #ffd700, #ffed4e);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
            text-decoration: none;
            font-weight: bold;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-shadow: 3px 3px 6px rgba(0, 0, 0, 0.4);
        }
        .nav-primary {
            display: flex;
            flex-wrap: wrap;
            gap: 1.8rem;
            align-items: center;
        }
        .nav-primary a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0;
            border-bottom: 3px solid transparent;
        }
        .nav-primary a:hover,
        .nav-primary a.active {
            border-bottom-color: #ffd700;
            color: #ffd700;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            max-width: 1200px;
            margin: 1rem auto;
            padding: 0 1rem;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #555; }
        .breadcrumb a:hover { color: #2a5db0; }
        .breadcrumb i { margin: 0 0.5rem; color: #888; }
        .main-container {
            max-width: 1200px;
            margin: 2rem auto;
            background: white;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            overflow: hidden;
            padding: 2.5rem;
        }
        .article-header {
            border-bottom: 3px solid #e63946;
            padding-bottom: 1.5rem;
            margin-bottom: 2.5rem;
        }
        h1 {
            font-size: 3.2rem;
            color: #1d2b64;
            line-height: 1.2;
            margin-bottom: 1rem;
        }
        .article-meta {
            color: #666;
            font-size: 0.95rem;
            display: flex;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        h2 {
            font-size: 2.2rem;
            color: #2a5db0;
            margin: 2.5rem 0 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px dashed #e0e0e0;
        }
        h3 {
            font-size: 1.8rem;
            color: #333;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #555;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .highlight {
            background-color: #f0f8ff;
            border-left: 5px solid #2a5db0;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .float-img {
            float: right;
            margin: 0 0 1.5rem 2rem;
            max-width: 45%;
            border-radius: 10px;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.1);
        }
        .btn {
            display: inline-block;
            background: linear-gradient(to right, #e63946, #ff6b6b);
            color: white;
            padding: 0.8rem 1.8rem;
            border-radius: 50px;
            font-weight: bold;
            border: none;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 10px rgba(230, 57, 70, 0.3);
        }
        .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(230, 57, 70, 0.4);
        }
        .interactive-module {
            background: #f8fafc;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
            border: 1px solid #e2e8f0;
        }
        .module-title {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: #1d2b64;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.9rem;
            border: 2px solid #cbd5e0;
            border-radius: 8px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-control:focus {
            border-color: #2a5db0;
            outline: none;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #ffd700;
            margin: 0.5rem 0;
        }
        .star-rating i {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .site-footer {
            max-width: 1200px;
            margin: 3rem auto 1rem;
            padding: 2rem 1rem;
            border-top: 1px solid #ddd;
            text-align: center;
            color: #666;
        }
        friend-link {
            display: block;
            margin: 1.5rem 0;
            font-style: italic;
        }
        friend-link a {
            color: #2a5db0;
            margin: 0 0.8rem;
        }
        .copyright {
            font-size: 0.9rem;
            margin-top: 1.5rem;
            color: #888;
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-primary {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1d2b64;
                padding: 1rem;
                border-radius: 8px;
                margin-top: 1rem;
            }
            .nav-primary.active { display: flex; }
            h1 { font-size: 2.5rem; }
            .main-container { padding: 1.5rem; margin: 1rem; }
            .float-img {
                float: none;
                max-width: 100%;
                margin: 1.5rem 0;
            }
            .header-container { flex-direction: column; align-items: stretch; }
            .my-logo { align-self: center; }
        }
        .clearfix::after {
            content: "";
            clear: both;
            display: table;
        }
        .text-bold { font-weight: 800; }
        .emoji { font-size: 1.2em; }
        .tag {
            display: inline-block;
            background: #e0f2fe;
            color: #0369a1;
            padding: 0.3rem 0.8rem;
            border-radius: 20px;
            font-size: 0.85rem;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }