* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            max-width: 1920px;
            margin: 0 auto;
            padding: 0;
        }
        img { max-width: 100%; height: auto; display: block; }
        .site-header {
            background: linear-gradient(135deg, #1a5f7a 0%, #2a9d8f 100%);
            color: white;
            padding: 1.2rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            text-decoration: none;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo span {
            background: #ffd166;
            color: #1a5f7a;
            padding: 5px 12px;
            border-radius: 8px;
            transform: rotate(-5deg);
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .main-nav a {
            color: #e9f5db;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 0.5rem 0.8rem;
            border-radius: 5px;
            transition: all 0.3s ease;
        }
        .main-nav a:hover,
        .main-nav a:focus {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #e9ecef;
            padding: 1rem 2rem;
            font-size: 0.95rem;
            border-bottom: 1px solid #ced4da;
        }
        .breadcrumb a {
            color: #1a5f7a;
            text-decoration: none;
            font-weight: 500;
        }
        .breadcrumb a:hover { text-decoration: underline; }
        .main-container {
            display: grid;
            grid-template-columns: 1fr minmax(300px, 25%);
            gap: 2.5rem;
            padding: 2.5rem;
        }
        @media (max-width: 992px) {
            .main-container { grid-template-columns: 1fr; }
        }
        .content-area {
            background: white;
            padding: 2.5rem;
            border-radius: 15px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.07);
        }
        h1, h2, h3, h4 {
            color: #1a5f7a;
            margin-top: 2rem;
            margin-bottom: 1rem;
            line-height: 1.3;
        }
        h1 { font-size: 2.8rem; border-bottom: 3px solid #ffd166; padding-bottom: 0.5rem; }
        h2 { font-size: 2.1rem; padding-left: 1rem; border-left: 5px solid #2a9d8f; }
        h3 { font-size: 1.7rem; color: #e76f51; }
        h4 { font-size: 1.4rem; color: #264653; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.25rem; color: #555; font-weight: 500; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        b, strong { color: #e76f51; }
        em { font-style: italic; color: #2a9d8f; }
        .content-area a {
            color: #1a5f7a;
            text-decoration: underline;
            font-weight: 600;
            transition: color 0.2s;
        }
        .content-area a:hover {
            color: #e76f51;
            text-decoration: none;
        }
        figure {
            margin: 2rem auto;
            text-align: center;
            background: #f8f9fa;
            padding: 1.5rem;
            border-radius: 10px;
            border-left: 5px solid #2a9d8f;
        }
        figcaption {
            font-style: italic;
            color: #666;
            margin-top: 0.8rem;
            font-size: 0.95rem;
        }
        ul, ol { margin-left: 2rem; margin-bottom: 1.5rem; }
        li { margin-bottom: 0.5rem; }
        .interactive-module {
            background: #f1faee;
            border: 2px dashed #2a9d8f;
            border-radius: 12px;
            padding: 2rem;
            margin: 3rem 0;
        }
        .interactive-module h3 { margin-top: 0; }
        .form-group { margin-bottom: 1.5rem; }
        label { display: block; margin-bottom: 0.5rem; font-weight: 600; color: #264653; }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid #ced4da;
            border-radius: 8px;
            font-family: inherit;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #1a5f7a;
            box-shadow: 0 0 0 3px rgba(26, 95, 122, 0.2);
        }
        button {
            background: linear-gradient(to right, #1a5f7a, #2a9d8f);
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1.1rem;
            cursor: pointer;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(26, 95, 122, 0.3);
        }
        .stars { display: flex; gap: 0.5rem; margin: 1rem 0; }
        .star { font-size: 2rem; color: #ddd; cursor: pointer; transition: color 0.2s; }
        .star:hover,
        .star.active { color: #ffd166; }
        .sidebar {
            background: white;
            padding: 2rem;
            border-radius: 15px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.07);
            align-self: start;
        }
        .sidebar h3 {
            background: #1a5f7a;
            color: white;
            padding: 1rem;
            border-radius: 8px;
            margin-top: 0;
            text-align: center;
        }
        .related-links { list-style: none; margin-left: 0; }
        .related-links li { margin-bottom: 1rem; }
        .related-links a {
            display: block;
            padding: 1rem;
            background: #f8f9fa;
            border-left: 4px solid #2a9d8f;
            text-decoration: none;
            color: #333;
            border-radius: 5px;
            transition: all 0.3s;
        }
        .related-links a:hover {
            background: #e9f5db;
            transform: translateX(5px);
        }
        .site-footer {
            background: #264653;
            color: #f1faee;
            padding: 3rem 2rem 1.5rem;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-section h4 {
            color: #ffd166;
            margin-top: 0;
            border-bottom: 2px solid #2a9d8f;
            padding-bottom: 0.5rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        friend-link a {
            color: #a8dadc;
            text-decoration: none;
            transition: color 0.3s;
        }
        friend-link a:hover { color: #ffd166; text-decoration: underline; }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #457b9d;
            font-size: 0.9rem;
            color: #a8dadc;
        }
        @media (max-width: 768px) {
            .site-header { flex-direction: column; align-items: flex-start; }
            .hamburger { display: block; }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .main-nav.active { max-height: 500px; margin-top: 1rem; }
            .main-nav ul { flex-direction: column; gap: 0.5rem; }
            .main-nav li { width: 100%; }
            .main-nav a { display: block; padding: 0.8rem; border-radius: 5px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .main-container, .content-area, .sidebar { padding: 1.5rem; }
        }