* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f9f9f9 0%, #f0f4ff 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #ff6600;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .header {
            background: linear-gradient(90deg, #1a237e 0%, #283593 50%, #3949ab 100%);
            color: white;
            padding: 1.5rem 2rem;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
            flex-wrap: wrap;
        }
        .logo a {
            font-size: 2.8rem;
            font-weight: 900;
            color: #ffd700;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
            font-family: 'Arial Black', sans-serif;
            letter-spacing: 1px;
        }
        .logo a:hover {
            color: #ffed4e;
            text-decoration: none;
        }
        .nav {
            display: flex;
            gap: 2.5rem;
        }
        .nav a {
            color: white;
            font-size: 1.2rem;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 8px;
            transition: background 0.3s ease;
        }
        .nav a:hover {
            background: rgba(255, 255, 255, 0.2);
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 2rem;
            cursor: pointer;
            color: white;
            background: none;
            border: none;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav {
                flex-direction: column;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
                background: #283593;
                padding: 1rem;
                display: none;
                z-index: 1000;
                box-shadow: 0 6px 12px rgba(0,0,0,0.15);
            }
            .nav.active {
                display: flex;
            }
            .nav a {
                width: 100%;
                text-align: center;
                padding: 1rem;
            }
        }
        .breadcrumb {
            background: #e8eaf6;
            padding: 1rem 2rem;
            font-size: 1rem;
            border-bottom: 1px solid #c5cae9;
        }
        .breadcrumb a {
            color: #3949ab;
        }
        .breadcrumb span {
            color: #666;
        }
        .main-content {
            flex: 1;
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 3fr 1fr;
            gap: 3rem;
        }
        @media (max-width: 1024px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        .article {
            background: white;
            border-radius: 20px;
            padding: 3rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
        }
        .sidebar {
            background: white;
            border-radius: 20px;
            padding: 2rem;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            align-self: start;
        }
        h1 {
            font-size: 3.2rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.3;
            border-bottom: 5px solid #ffd700;
            padding-bottom: 1rem;
        }
        h2 {
            font-size: 2.4rem;
            color: #283593;
            margin: 3rem 0 1.5rem;
            padding-left: 1rem;
            border-left: 6px solid #ff6600;
        }
        h3 {
            font-size: 1.8rem;
            color: #3949ab;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #5c6bc0;
            margin: 2rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.8rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .highlight {
            background: #fff9c4;
            padding: 1.5rem;
            border-left: 6px solid #ffd700;
            border-radius: 10px;
            margin: 2rem 0;
            font-size: 1.2rem;
            font-weight: 600;
        }
        .emoji {
            font-size: 1.4rem;
            margin-right: 0.5rem;
        }
        .bold {
            font-weight: 900;
            color: #1a237e;
        }
        .last-updated {
            font-size: 1rem;
            color: #666;
            text-align: right;
            margin-top: 3rem;
            padding-top: 1rem;
            border-top: 2px dashed #ccc;
        }
        .article-img {
            width: 100%;
            border-radius: 15px;
            margin: 2.5rem auto;
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .form-section {
            background: #f5f7ff;
            padding: 2rem;
            border-radius: 15px;
            margin: 3rem 0;
        }
        .form-title {
            font-size: 1.6rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #333;
        }
        input, textarea, select {
            width: 100%;
            padding: 1rem;
            border: 2px solid #c5cae9;
            border-radius: 10px;
            font-size: 1rem;
            transition: border 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3949ab;
            box-shadow: 0 0 8px rgba(57, 73, 171, 0.3);
        }
        button {
            background: linear-gradient(90deg, #ff6600 0%, #ff8c00 100%);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: 10px;
            font-size: 1.2rem;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(255, 102, 0, 0.4);
        }
        .sidebar h3 {
            font-size: 1.6rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            text-align: center;
        }
        .link-list {
            list-style: none;
        }
        .link-list li {
            margin-bottom: 1.2rem;
            padding: 1rem;
            background: #f0f4ff;
            border-radius: 10px;
            transition: background 0.3s ease;
        }
        .link-list li:hover {
            background: #e1e8ff;
        }
        .link-list a {
            color: #283593;
            font-weight: 600;
            display: block;
        }
        .footer {
            background: #1a237e;
            color: white;
            padding: 3rem 2rem;
            margin-top: 4rem;
        }
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 3rem;
        }
        .footer-section h4 {
            color: #ffd700;
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .footer-links a {
            color: #bbdefb;
            display: block;
            margin-bottom: 0.8rem;
        }
        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 1rem;
        }
        friend-link {
            background: #283593;
            padding: 1rem 1.5rem;
            border-radius: 8px;
            font-weight: 600;
        }
        friend-link a {
            color: white;
        }
        .copyright {
            text-align: center;
            margin-top: 3rem;
            padding-top: 2rem;
            border-top: 1px solid #3949ab;
            font-size: 1rem;
            color: #bbdefb;
        }
        .text-center {
            text-align: center;
        }
        .mb-3 {
            margin-bottom: 3rem;
        }