:root {
            --primary: #2a4365;
            --secondary: #c53030;
            --accent: #ecc94b;
            --light: #f7fafc;
            --dark: #1a202c;
            --gray: #718096;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark);
            background-color: var(--light);
            overflow-x: hidden;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary) 0%, #1a365d 100%);
            color: white;
            padding: 1rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 900;
            text-decoration: none;
            color: var(--accent);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 0.75rem;
            transition: var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.03);
            color: white;
        }
        .my-logo i {
            font-size: 2.5rem;
        }
        .main-nav ul {
            display: flex;
            list-style: none;
            gap: 2.5rem;
        }
        .main-nav a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.05rem;
            padding: 0.5rem 0;
            position: relative;
            transition: var(--transition);
        }
        .main-nav a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 3px;
            background-color: var(--accent);
            transition: width 0.3s ease;
        }
        .main-nav a:hover:after {
            width: 100%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: #edf2f7;
            padding: 1rem 2rem;
            font-size: 0.9rem;
            border-bottom: 1px solid #cbd5e0;
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .main-container {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            max-width: 1400px;
            margin: 2rem auto;
            padding: 0 2rem;
        }
        article {
            background: white;
            border-radius: var(--radius);
            padding: 3rem;
            box-shadow: var(--shadow);
        }
        .article-header {
            border-bottom: 3px solid var(--accent);
            padding-bottom: 2rem;
            margin-bottom: 3rem;
        }
        h1 {
            font-size: 3.2rem;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 1.5rem;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--gray);
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
        }
        .update-time {
            background-color: #fff5f5;
            color: var(--secondary);
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-weight: 600;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--primary);
            margin: 3rem 0 1.5rem;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 {
            font-size: 1.7rem;
            color: #2d3748;
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.3rem;
            color: #4a5568;
            margin: 2rem 0 0.8rem;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
            text-align: justify;
        }
        .lead {
            font-size: 1.4rem;
            font-weight: 500;
            color: var(--primary);
            background-color: #ebf8ff;
            padding: 1.5rem;
            border-left: 5px solid var(--secondary);
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 2.5rem 0;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
            border: 1px solid #fbbf24;
            padding: 2rem;
            border-radius: var(--radius);
            margin: 2.5rem 0;
            box-shadow: 0 6px 12px rgba(251, 191, 36, 0.15);
        }
        .content-img {
            width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 2.5rem 0;
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
            transition: var(--transition);
        }
        .content-img:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
        }
        .interactive-section {
            background-color: #f7fafc;
            border-radius: var(--radius);
            padding: 2.5rem;
            margin: 3rem 0;
            border: 1px solid #e2e8f0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--primary);
        }
        input, textarea, select {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 2px solid #cbd5e0;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(42, 67, 101, 0.2);
        }
        button {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: var(--radius);
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
        }
        button:hover {
            background-color: #1a365d;
            transform: translateY(-2px);
            box-shadow: 0 7px 14px rgba(42, 67, 101, 0.25);
        }
        .rating-stars {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .star {
            color: #cbd5e0;
            font-size: 1.8rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #f6ad55;
        }
        .sidebar {
            background: white;
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            align-self: start;
            position: sticky;
            top: 120px;
        }
        .sidebar-widget {
            margin-bottom: 2.5rem;
        }
        .sidebar h3 {
            font-size: 1.4rem;
            margin-top: 0;
            color: var(--primary);
            padding-bottom: 0.75rem;
            border-bottom: 2px solid var(--accent);
        }
        .related-links ul {
            list-style: none;
        }
        .related-links li {
            margin-bottom: 1rem;
        }
        .related-links a {
            color: var(--dark);
            text-decoration: none;
            display: block;
            padding: 0.875rem 1rem;
            border-radius: var(--radius);
            background-color: #f7fafc;
            transition: var(--transition);
            border-left: 4px solid transparent;
        }
        .related-links a:hover {
            background-color: #edf2f7;
            border-left-color: var(--secondary);
            transform: translateX(5px);
        }
        .stats-box {
            background: linear-gradient(135deg, var(--primary) 0%, #2d3748 100%);
            color: white;
            padding: 1.5rem;
            border-radius: var(--radius);
            text-align: center;
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--accent);
            line-height: 1;
        }
        .site-footer {
            background-color: var(--dark);
            color: white;
            padding: 3rem 2rem 1.5rem;
            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: var(--accent);
            font-size: 1.3rem;
            margin-bottom: 1.5rem;
        }
        friend-link {
            display: block;
            background-color: #2d3748;
            padding: 2rem;
            border-radius: var(--radius);
            margin: 2rem auto;
            max-width: 1400px;
            text-align: center;
        }
        friend-link a {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
            margin: 0 1.5rem;
            transition: var(--transition);
        }
        friend-link a:hover {
            color: white;
            text-decoration: underline;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid #4a5568;
            color: #a0aec0;
            font-size: 0.95rem;
        }
        @media (max-width: 1024px) {
            .main-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .sidebar {
                position: static;
            }
            h1 {
                font-size: 2.8rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .main-nav {
                display: none;
                width: 100%;
                order: 3;
                margin-top: 1.5rem;
            }
            .main-nav.active {
                display: block;
            }
            .main-nav ul {
                flex-direction: column;
                gap: 0;
            }
            .main-nav li {
                width: 100%;
                border-bottom: 1px solid rgba(255,255,255,0.1);
            }
            .main-nav a {
                display: block;
                padding: 1rem 0;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.3rem;
            }
            h2 {
                font-size: 1.9rem;
            }
            article {
                padding: 2rem;
            }
            .main-container, .breadcrumb {
                padding: 0 1rem;
            }
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 0.2rem;
        }
        .keyword {
            background-color: #fed7d7;
            color: #742a2a;
            padding: 0.2rem 0.5rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .note {
            background-color: #e6fffa;
            border-left: 4px solid #38b2ac;
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }