* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f5f7fa;
            padding: 0;
            margin: 0;
        }
        a {
            color: #1a73e8;
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
            color: #0d47a1;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .header {
            background: linear-gradient(135deg, #2c3e50, #4a6491);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #00bcd4;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .my-logo:hover {
            color: #ffeb3b;
            transform: scale(1.05);
            transition: transform 0.3s ease;
        }
        .nav {
            display: flex;
            gap: 2rem;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .nav-links a {
            color: white;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: background 0.3s;
        }
        .nav-links a:hover {
            background: rgba(255,255,255,0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: white;
        }
        @media (max-width: 768px) {
            .nav-links {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #2c3e50;
                padding: 1rem;
                display: none;
                z-index: 1000;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .nav {
                position: relative;
            }
        }
        .breadcrumb {
            background: #e8f4fc;
            padding: 0.8rem 20px;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb a {
            color: #555;
        }
        .breadcrumb a:hover {
            color: #1a73e8;
        }
        .main-content {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2rem;
            padding: 2rem 0;
        }
        @media (max-width: 992px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article {
            background: white;
            padding: 2rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        .sidebar {
            background: white;
            padding: 1.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
        }
        h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 6px solid #00bcd4;
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #34495e;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #eee;
        }
        h3 {
            font-size: 1.6rem;
            color: #4a6491;
            margin: 1.8rem 0 0.8rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5d7ba3;
            margin: 1.5rem 0 0.6rem;
        }
        p {
            margin-bottom: 1.2rem;
            text-align: justify;
            font-size: 1.05rem;
        }
        .highlight {
            background: #fff9c4;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: bold;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3rem;
        }
        blockquote {
            border-left: 4px solid #00bcd4;
            padding-left: 1.5rem;
            margin: 1.5rem 0;
            font-style: italic;
            color: #555;
            background: #f9f9f9;
            padding: 1rem;
            border-radius: 0 8px 8px 0;
        }
        .article-img {
            margin: 2rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
            max-width: 800px;
        }
        .article-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .article-img:hover img {
            transform: scale(1.03);
        }
        .form-section {
            background: #f8fdff;
            padding: 1.5rem;
            border-radius: 10px;
            margin: 2rem 0;
            border: 1px solid #d1e7ff;
        }
        .form-title {
            font-size: 1.4rem;
            color: #2c3e50;
            margin-bottom: 1rem;
        }
        .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 #ccc;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #00bcd4;
            outline: none;
        }
        .btn {
            background: #00bcd4;
            color: white;
            padding: 0.8rem 1.5rem;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: bold;
            transition: background 0.3s, transform 0.2s;
        }
        .btn:hover {
            background: #0097a7;
            transform: translateY(-2px);
        }
        .sidebar h3 {
            color: #2c3e50;
            border-left: 4px solid #ff9800;
            padding-left: 0.8rem;
        }
        .sidebar ul {
            list-style: none;
            padding-left: 0;
        }
        .sidebar li {
            margin-bottom: 0.8rem;
            padding-left: 1.2rem;
            position: relative;
        }
        .sidebar li:before {
            content: '▶';
            color: #00bcd4;
            position: absolute;
            left: 0;
        }
        .footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 2rem;
        }
        .footer-section {
            flex: 1;
            min-width: 250px;
        }
        .footer h3 {
            color: #00bcd4;
            margin-bottom: 1rem;
            font-size: 1.4rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.5rem;
            color: #ffeb3b;
            font-weight: 500;
        }
        friend-link:hover {
            color: #ffc107;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #4a6491;
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #bdc3c7;
        }
        .text-center { text-align: center; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .last-updated {
            font-size: 0.9rem;
            color: #777;
            text-align: right;
            margin-top: 1rem;
            font-style: italic;
        }