* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        a {
            text-decoration: none;
            color: #d32f2f;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #9a0007;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul {
            list-style: none;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a237e 0%, #283593 100%);
            color: white;
            padding: 1.5rem 0;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            color: #ffeb3b;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .my-logo span {
            color: #4caf50;
        }
        .my-logo:hover {
            color: #ffc107;
        }
        .main-nav ul {
            display: flex;
            gap: 2rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav a:hover {
            background-color: rgba(255, 255, 255, 0.15);
            transform: translateY(-2px);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        .breadcrumb {
            background-color: #e8eaf6;
            padding: 1rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '/';
            margin-left: 0.5rem;
            color: #777;
        }
        main {
            flex: 1;
            padding: 2rem 0;
        }
        article {
            background: white;
            border-radius: 12px;
            padding: 2.5rem;
            box-shadow: 0 6px 20px rgba(0,0,0,0.08);
            margin-bottom: 2rem;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 1.5rem;
            margin-bottom: 2rem;
            border-bottom: 2px dashed #e0e0e0;
            font-size: 0.9rem;
            color: #666;
        }
        .update-time {
            background: #e3f2fd;
            padding: 0.4rem 0.8rem;
            border-radius: 20px;
            font-weight: 600;
        }
        h1 {
            font-size: 2.8rem;
            color: #1a237e;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            color: #283593;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid #ffeb3b;
        }
        h3 {
            font-size: 1.6rem;
            color: #3949ab;
            margin: 2rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #5c6bc0;
            margin: 1.5rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: #555;
            background: #f5f5f5;
            padding: 1.5rem;
            border-left: 5px solid #4caf50;
            border-radius: 0 8px 8px 0;
            margin-bottom: 2rem;
        }
        .highlight {
            background-color: #fff9c4;
            padding: 0.2rem 0.5rem;
            border-radius: 3px;
            font-weight: 600;
        }
        .note {
            background: #e8f5e9;
            border-left: 4px solid #4caf50;
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .note strong {
            color: #2e7d32;
        }
        .feature-img {
            width: 100%;
            max-width: 800px;
            margin: 2rem auto;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            border: 5px solid white;
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        .links-section {
            background: #f3e5f5;
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
        }
        .links-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1rem;
            margin-top: 1rem;
        }
        .link-card {
            background: white;
            padding: 1.2rem;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .link-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        .link-card i {
            color: #7b1fa2;
            margin-right: 0.8rem;
        }
        .interactive-section {
            background: #fff3e0;
            padding: 2.5rem;
            border-radius: 12px;
            margin: 3rem 0;
        }
        .interactive-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 2rem;
            margin-top: 1.5rem;
        }
        .feature-box {
            background: white;
            padding: 1.8rem;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 6px 12px rgba(0,0,0,0.08);
            transition: all 0.3s ease;
        }
        .feature-box:hover {
            transform: scale(1.03);
            box-shadow: 0 10px 20px rgba(0,0,0,0.12);
        }
        .feature-box i {
            font-size: 2.5rem;
            color: #1a237e;
            margin-bottom: 1rem;
        }
        .feature-box h4 {
            margin-top: 0;
        }
        .feature-box form {
            margin-top: 1rem;
        }
        input, textarea, select {
            width: 100%;
            padding: 0.8rem;
            margin-bottom: 1rem;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-family: inherit;
        }
        button, .btn {
            background: linear-gradient(to right, #1a237e, #283593);
            color: white;
            border: none;
            padding: 0.9rem 1.8rem;
            border-radius: 6px;
            font-weight: 700;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            background: linear-gradient(to right, #283593, #3949ab);
            transform: translateY(-2px);
        }
        .stars {
            font-size: 1.8rem;
            color: #ffd700;
            cursor: pointer;
            margin: 0.5rem 0;
        }
        .stars span:hover,
        .stars span:hover ~ span {
            color: #ffab00;
        }
        .site-footer {
            background: #1a237e;
            color: white;
            padding: 3rem 0 1.5rem;
            margin-top: auto;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-logo {
            font-size: 1.8rem;
            font-weight: 900;
            color: #ffeb3b;
            margin-bottom: 1rem;
        }
        .footer-nav h4, .friend-links h4 {
            color: #ffeb3b;
            margin-bottom: 1.2rem;
            font-size: 1.2rem;
        }
        .footer-nav ul li, .friend-links ul li {
            margin-bottom: 0.8rem;
        }
        .footer-nav a, .friend-links a {
            color: #bbdefb;
        }
        .footer-nav a:hover, .friend-links a:hover {
            color: #ffeb3b;
            padding-left: 5px;
        }
        friend-link {
            display: inline-block;
            background: #283593;
            padding: 0.4rem 0.8rem;
            border-radius: 4px;
            margin-right: 0.5rem;
            margin-bottom: 0.5rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #3949ab;
            font-size: 0.9rem;
            color: #bbdefb;
        }
        @media (max-width: 992px) {
            h1 { font-size: 2.4rem; }
            h2 { font-size: 1.8rem; }
            .main-nav ul { gap: 1rem; }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .main-nav {
                position: fixed;
                top: 85px;
                left: -100%;
                width: 280px;
                height: calc(100vh - 85px);
                background: #1a237e;
                flex-direction: column;
                padding: 2rem;
                transition: left 0.4s ease;
                box-shadow: 5px 0 15px rgba(0,0,0,0.2);
            }
            .main-nav.active { left: 0; }
            .main-nav ul {
                flex-direction: column;
                gap: 1rem;
            }
            .header-container { padding: 0 15px; }
            article { padding: 1.5rem; }
            .interactive-section { padding: 1.5rem; }
        }
        @media (max-width: 480px) {
            h1 { font-size: 2rem; }
            .my-logo { font-size: 1.5rem; }
            .feature-box { padding: 1.2rem; }
            .links-grid { grid-template-columns: 1fr; }
        }