:root {
            --primary-bg: #0f172a;
            --secondary-bg: #1e293b;
            --accent-color: #6366f1;
            --accent-hover: #4f46e5;
            --text-primary: #f1f5f9;
            --text-secondary: #cbd5e1;
            --card-bg: #334155;
            --border-color: #475569;
            --success: #10b981;
            --warning: #f59e0b;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: var(--primary-bg);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
        }
        a {
            color: var(--accent-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: var(--accent-hover);
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background-color: var(--secondary-bg);
            border-bottom: 1px solid var(--border-color);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--accent-color), #a855f7);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        .nav-desktop a {
            font-weight: 600;
            padding: 0.5rem 0;
            position: relative;
        }
        .nav-desktop a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-color);
            transition: width 0.3s;
        }
        .nav-desktop a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            background: none;
            border: none;
            color: var(--text-primary);
            cursor: pointer;
        }
        .nav-mobile {
            display: none;
            flex-direction: column;
            background-color: var(--secondary-bg);
            position: absolute;
            top: 100%;
            left: 0;
            width: 100%;
            padding: 1rem;
            border-top: 1px solid var(--border-color);
        }
        .nav-mobile.active {
            display: flex;
        }
        .nav-mobile a {
            padding: 0.8rem 0;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb {
            padding: 1rem 0;
            font-size: 0.9rem;
            color: var(--text-secondary);
        }
        .breadcrumb a {
            color: var(--text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--accent-color);
        }
        .main-article {
            background-color: var(--secondary-bg);
            border-radius: 12px;
            padding: 2.5rem;
            margin: 2rem 0;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
        }
        h1 {
            font-size: 3rem;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            color: var(--text-primary);
            text-align: center;
        }
        h2 {
            font-size: 2.2rem;
            margin: 2.5rem 0 1.2rem;
            color: var(--accent-color);
            border-left: 5px solid var(--accent-color);
            padding-left: 15px;
        }
        h3 {
            font-size: 1.7rem;
            margin: 2rem 0 1rem;
            color: var(--text-primary);
        }
        h4 {
            font-size: 1.3rem;
            margin: 1.5rem 0 0.8rem;
            color: var(--text-secondary);
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.3rem;
            font-weight: 500;
            color: var(--text-secondary);
            margin-bottom: 2rem;
            text-align: center;
            font-style: italic;
        }
        .highlight-box {
            background-color: var(--card-bg);
            border-left: 4px solid var(--warning);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-card {
            background: linear-gradient(145deg, var(--card-bg), #2d3748);
            padding: 1.5rem;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
            transition: transform 0.3s;
        }
        .stat-card:hover {
            transform: translateY(-5px);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--accent-color);
            margin-bottom: 1rem;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 10px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 20px rgba(0,0,0,0.4);
            border: 2px solid var(--border-color);
        }
        .interactive-section {
            background-color: var(--primary-bg);
            padding: 2rem;
            border-radius: 10px;
            margin: 3rem 0;
        }
        .interactive-section h3 {
            text-align: center;
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }
        .form-control {
            width: 100%;
            padding: 0.9rem;
            background-color: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            color: var(--text-primary);
            font-size: 1rem;
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .rating input {
            display: none;
        }
        .rating label {
            font-size: 2rem;
            color: var(--border-color);
            cursor: pointer;
            transition: color 0.2s;
        }
        .rating input:checked ~ label,
        .rating label:hover,
        .rating label:hover ~ label {
            color: var(--warning);
        }
        .btn {
            display: inline-block;
            padding: 0.9rem 2rem;
            background-color: var(--accent-color);
            color: white;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: background-color 0.3s, transform 0.2s;
        }
        .btn:hover {
            background-color: var(--accent-hover);
            transform: scale(1.03);
        }
        .btn-block {
            width: 100%;
        }
        .site-footer {
            background-color: var(--secondary-bg);
            border-top: 1px solid var(--border-color);
            padding: 3rem 0 1.5rem;
            margin-top: 4rem;
        }
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            margin-bottom: 2rem;
        }
        friend-link {
            display: block;
            margin-bottom: 0.8rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 0.9rem;
        }
        .update-time {
            color: var(--warning);
            font-weight: bold;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-desktop {
                display: none;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            .main-article {
                padding: 1.5rem;
            }
            .header-content, .footer-content {
                flex-direction: column;
                text-align: center;
            }
        }