* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            line-height: 1.7;
            color: #2c3e50;
            background-color: #f8f9fa;
            overflow-x: hidden;
        }
        a {
            color: #3498db;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #1abc9c;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: #1abc9c;
            text-shadow: 2px 2px 0 #1a5276;
        }
        .my-logo a {
            color: inherit;
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .breadcrumb {
            background-color: #ecf0f1;
            padding: 0.75rem 0;
            font-size: 0.9rem;
            margin-bottom: 2rem;
        }
        .breadcrumb-list {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
        }
        .breadcrumb-item {
            margin-right: 0.5rem;
            color: #7f8c8d;
        }
        .breadcrumb-item a {
            color: #3498db;
        }
        .breadcrumb-item::after {
            content: '/';
            margin-left: 0.5rem;
            color: #bdc3c7;
        }
        .breadcrumb-item:last-child::after {
            content: '';
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 1.5rem;
        }
        .main-nav a {
            color: white;
            font-weight: 600;
            padding: 0.5rem 0.75rem;
            border-radius: 4px;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav a:hover {
            background-color: rgba(255,255,255,0.15);
            color: #1abc9c;
        }
        .main-content {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-bottom: 3px solid #1abc9c;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 2rem;
            color: #2980b9;
            margin: 2.5rem 0 1rem 0;
            padding-top: 1rem;
        }
        h3 {
            font-size: 1.5rem;
            color: #16a085;
            margin: 1.8rem 0 0.8rem 0;
        }
        h4 {
            font-size: 1.2rem;
            color: #8e44ad;
            margin: 1.5rem 0 0.5rem 0;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.25rem;
            color: #34495e;
            font-weight: 500;
            margin-bottom: 2rem;
            padding: 1rem;
            background-color: #ecf9ff;
            border-left: 5px solid #3498db;
            border-radius: 0 8px 8px 0;
        }
        .highlight {
            background-color: #fffacd;
            padding: 0.2rem 0.4rem;
            border-radius: 3px;
            font-weight: 600;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.3rem;
        }
        .feature-img {
            margin: 2.5rem auto;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            max-width: 900px;
        }
        .feature-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .feature-img:hover img {
            transform: scale(1.03);
        }
        .img-caption {
            text-align: center;
            font-style: italic;
            color: #7f8c8d;
            padding: 0.75rem;
            background-color: #f8f9fa;
            font-size: 0.9rem;
        }
        .interaction-module {
            background: #f1f8ff;
            border: 1px solid #d1e3ff;
            border-radius: 10px;
            padding: 1.5rem;
            margin: 2.5rem 0;
        }
        .module-title {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            color: #2c3e50;
            margin-bottom: 1.25rem;
        }
        .module-title i {
            color: #e74c3c;
        }
        form {
            display: grid;
            gap: 1rem;
            max-width: 600px;
        }
        input, textarea, select {
            padding: 0.85rem;
            border: 1px solid #bdc3c7;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
            transition: border-color 0.3s ease;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        button, .btn {
            background: linear-gradient(to right, #3498db, #2ecc71);
            color: white;
            border: none;
            padding: 0.9rem 1.75rem;
            border-radius: 6px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            display: inline-block;
            text-align: center;
        }
        button:hover, .btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 7px 14px rgba(50, 150, 250, 0.4);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            font-size: 1.8rem;
            color: #f1c40f;
            margin-bottom: 1rem;
        }
        .star {
            cursor: pointer;
            transition: transform 0.2s;
        }
        .star:hover {
            transform: scale(1.3);
        }
        .content-links {
            background-color: #f0f7ff;
            padding: 1rem 1.5rem;
            border-radius: 8px;
            margin: 2rem 0;
            border-left: 4px solid #3498db;
        }
        .content-links ul {
            list-style-position: inside;
            color: #2c3e50;
        }
        .content-links li {
            margin-bottom: 0.5rem;
            padding-left: 0.5rem;
        }
        .site-footer {
            background-color: #2c3e50;
            color: #ecf0f1;
            padding: 3rem 0 1.5rem 0;
            margin-top: 3rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }
        .footer-section h3 {
            color: #1abc9c;
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #34495e;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.75rem;
        }
        .footer-links a {
            color: #bdc3c7;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-links a:hover {
            color: #1abc9c;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            padding: 1rem;
            background: #34495e;
            border-radius: 6px;
            margin-bottom: 1rem;
            border-left: 5px solid #1abc9c;
        }
        friend-link a {
            color: #ecf0f1;
            font-weight: bold;
            display: block;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid #34495e;
            color: #95a5a6;
            font-size: 0.9rem;
        }
        .last-updated {
            text-align: right;
            font-style: italic;
            color: #7f8c8d;
            font-size: 0.9rem;
            margin-top: 2rem;
            padding-top: 1rem;
            border-top: 1px dashed #bdc3c7;
        }
        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                width: 100%;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.5s ease;
            }
            .main-nav.active {
                max-height: 300px;
                margin-top: 1rem;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0.75rem;
            }
            .main-nav a {
                padding: 0.75rem;
                background-color: rgba(0,0,0,0.2);
                border-radius: 6px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            h3 {
                font-size: 1.3rem;
            }
            .main-content {
                padding: 1.5rem;
            }
            .footer-content {
                grid-template-columns: 1fr;
            }
        }
        .text-center { text-align: center; }
        .mb-2 { margin-bottom: 2rem; }
        .mt-2 { margin-top: 2rem; }
        .py-1 { padding-top: 1rem; padding-bottom: 1rem; }
        .hidden { display: none; }