* { 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: #2c3e50;
            background: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            min-height: 100vh;
            padding-bottom: 2rem;
        }
        img { max-width: 100%; height: auto; display: block; }
        h1, h2, h3, h4 { font-family: Georgia, 'Times New Roman', Times, serif; color: #1a5276; margin-bottom: 1rem; line-height: 1.3; }
        h1 { font-size: 2.8rem; border-bottom: 3px solid #3498db; padding-bottom: 0.5rem; margin-top: 1.5rem; }
        h2 { font-size: 2.2rem; margin-top: 2.5rem; padding-left: 0.5rem; border-left: 5px solid #2ecc71; }
        h3 { font-size: 1.8rem; margin-top: 2rem; color: #2980b9; }
        h4 { font-size: 1.4rem; margin-top: 1.5rem; color: #16a085; }
        p { margin-bottom: 1.5rem; text-align: justify; }
        .lead { font-size: 1.3rem; color: #34495e; font-weight: 300; }
        .highlight { background-color: #fffacd; padding: 0.2rem 0.5rem; border-radius: 3px; }
        .emoji { font-size: 1.2em; margin-right: 0.3rem; }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .content-main {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin-top: 2rem;
        }
        @media (max-width: 992px) {
            .content-main { grid-template-columns: 1fr; }
        }
        header { background-color: #1a5276; 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 a {
            color: #fff;
            text-decoration: none;
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: 1px;
            transition: color 0.3s;
            display: flex;
            align-items: center;
        }
        .my-logo a:hover { color: #2ecc71; }
        .my-logo i { margin-right: 10px; }
        nav ul { display: flex; list-style: none; }
        nav li { margin-left: 2rem; }
        nav a {
            color: #ecf0f1;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 0.8rem;
            border-radius: 4px;
            transition: all 0.3s;
        }
        nav a:hover, nav a.active { background-color: #3498db; color: white; }
        .hamburger { display: none; font-size: 1.8rem; cursor: pointer; }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            nav ul {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background-color: #1a5276;
                display: none;
                box-shadow: 0 5px 10px rgba(0,0,0,0.2);
                padding: 1rem 0;
            }
            nav.active ul { display: flex; }
            nav li { margin: 0; text-align: center; }
            nav a { display: block; padding: 0.8rem 1rem; border-bottom: 1px solid #2c3e50; }
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            background-color: #ecf0f1;
            border-radius: 5px;
            margin-top: 1rem;
        }
        .breadcrumb a { color: #3498db; text-decoration: none; }
        .breadcrumb a:hover { text-decoration: underline; }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            height: fit-content;
            position: sticky;
            top: 120px;
        }
        .sidebar h3 { margin-top: 0; }
        .widget { margin-bottom: 2rem; }
        .search-form input {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #bdc3c7;
            border-radius: 5px 0 0 5px;
        }
        .search-form button {
            width: 100%;
            margin-top: 0.5rem;
            padding: 0.8rem;
            background-color: #3498db;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .search-form button:hover { background-color: #2980b9; }
        .link-list a {
            display: block;
            padding: 0.7rem;
            margin-bottom: 0.5rem;
            background-color: #f8f9fa;
            border-left: 4px solid #3498db;
            text-decoration: none;
            color: #2c3e50;
            transition: all 0.3s;
        }
        .link-list a:hover {
            background-color: #e3f2fd;
            border-left-color: #2ecc71;
            padding-left: 1.2rem;
        }
        .interaction-form {
            background: white;
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin: 2rem 0;
        }
        .interaction-form h3 { margin-top: 0; }
        .form-group { margin-bottom: 1rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        .form-group input, .form-group textarea, .form-group select {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid #bdc3c7;
            border-radius: 5px;
            font-family: inherit;
        }
        .form-group textarea { min-height: 120px; }
        .btn-submit {
            background-color: #2ecc71;
            color: white;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            cursor: pointer;
            font-weight: bold;
            transition: background 0.3s;
        }
        .btn-submit:hover { background-color: #27ae60; }
        .star-rating { font-size: 1.8rem; color: #f1c40f; margin: 0.5rem 0; }
        .star-rating i { cursor: pointer; margin-right: 0.2rem; }
        .star-rating i:hover { transform: scale(1.2); }
        article { background: white; padding: 2.5rem; border-radius: 10px; box-shadow: 0 5px 20px rgba(0,0,0,0.08); }
        .article-meta { color: #7f8c8d; font-size: 0.9rem; margin-bottom: 2rem; border-bottom: 1px dashed #bdc3c7; padding-bottom: 1rem; }
        .feature-img {
            float: left;
            margin: 0 1.5rem 1rem 0;
            border-radius: 8px;
            max-width: 400px;
            border: 5px solid #ecf0f1;
        }
        @media (max-width: 768px) {
            .feature-img { float: none; margin: 0 auto 1.5rem; max-width: 100%; }
        }
        .insight-box {
            background: linear-gradient(to right, #e3f2fd, #f3e5f5);
            padding: 1.5rem;
            border-left: 5px solid #9b59b6;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .quote {
            font-style: italic;
            font-size: 1.2rem;
            color: #555;
            text-align: center;
            padding: 2rem;
            border-top: 2px solid #3498db;
            border-bottom: 2px solid #3498db;
            margin: 2rem 0;
        }
        footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem;
            margin-top: 3rem;
            text-align: center;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-links a { color: #3498db; text-decoration: none; }
        .footer-links a:hover { text-decoration: underline; }
        friend-link {
            display: block;
            margin: 1rem auto;
            color: #2ecc71;
            font-weight: bold;
        }
        .copyright { font-size: 0.9rem; color: #95a5a6; margin-top: 1.5rem; }
        .clearfix::after { content: ""; clear: both; display: table; }
        .text-center { text-align: center; }
        .mb-3 { margin-bottom: 3rem; }