:root {
            --primary-blue: #3a86ff;
            --secondary-purple: #8338ec;
            --accent-pink: #ff006e;
            --light-bg: #f8f9fa;
            --dark-text: #212529;
            --gray-border: #dee2e6;
            --success-green: #38b000;
            --warning-orange: #ff9e00;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 8px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: var(--dark-text);
            background-color: #fff;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        a {
            color: var(--primary-blue);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--accent-pink);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .site-header {
            padding: 1.5rem 0;
            border-bottom: 1px solid var(--gray-border);
            margin-bottom: 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        .logo-container {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .my-logo {
            font-size: 2.8rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary-blue), var(--secondary-purple));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            letter-spacing: -0.5px;
            text-align: center;
            display: inline-block;
        }
        .my-logo:hover {
            opacity: 0.9;
        }
        .breadcrumb {
            font-size: 0.9rem;
            color: #6c757d;
            margin-top: 0.5rem;
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            justify-content: center;
        }
        .breadcrumb li {
            display: inline;
        }
        .breadcrumb li+li:before {
            content: "/\00a0";
            padding: 0 8px;
            color: #adb5bd;
        }
        .nav-container {
            position: relative;
        }
        .main-nav {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 1.5rem;
            background: var(--light-bg);
            padding: 1rem;
            border-radius: var(--radius);
        }
        .main-nav a {
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
        }
        .main-nav a:hover {
            background-color: rgba(58, 134, 255, 0.1);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--primary-blue);
            cursor: pointer;
            position: absolute;
            top: -50px;
            right: 10px;
        }
        .search-section {
            margin: 2rem auto;
            max-width: 600px;
        }
        .search-form {
            display: flex;
            border-radius: 50px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .search-input {
            flex-grow: 1;
            padding: 1rem 1.5rem;
            border: none;
            font-size: 1rem;
        }
        .search-input:focus {
            outline: 2px solid var(--primary-blue);
            outline-offset: -2px;
        }
        .search-btn {
            background: linear-gradient(90deg, var(--primary-blue), var(--secondary-purple));
            color: white;
            border: none;
            padding: 0 2rem;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
        }
        .search-btn:hover {
            opacity: 0.95;
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
            margin: 2rem 0;
        }
        @media (max-width: 992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
        }
        .main-content {
            min-width: 0;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            padding-bottom: 1rem;
            margin-bottom: 2rem;
            border-bottom: 1px solid var(--gray-border);
            font-size: 0.95rem;
            color: #6c757d;
        }
        .update-time {
            background: var(--light-bg);
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
        }
        .update-time i {
            margin-right: 0.5rem;
            color: var(--warning-orange);
        }
        h1, h2, h3, h4 {
            line-height: 1.3;
            margin-top: 2.5rem;
            margin-bottom: 1.2rem;
            color: var(--dark-text);
            font-weight: 700;
        }
        h1 {
            font-size: 2.8rem;
            text-align: center;
            margin-top: 1rem;
            background: linear-gradient(90deg, var(--dark-text), var(--secondary-purple));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            padding-bottom: 1rem;
            border-bottom: 3px solid var(--light-bg);
        }
        h2 {
            font-size: 2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--gray-border);
            color: var(--secondary-purple);
        }
        h3 {
            font-size: 1.6rem;
            color: var(--primary-blue);
        }
        h4 {
            font-size: 1.3rem;
            color: #495057;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.25rem;
            font-weight: 500;
            color: #495057;
            background-color: var(--light-bg);
            padding: 1.5rem;
            border-left: 4px solid var(--primary-blue);
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 2rem 0;
        }
        .highlight-box {
            background: linear-gradient(135deg, rgba(58, 134, 255, 0.08), rgba(131, 56, 236, 0.08));
            border: 1px solid rgba(58, 134, 255, 0.2);
            padding: 1.8rem;
            border-radius: var(--radius);
            margin: 2rem 0;
        }
        .highlight-box h4 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .highlight-box i {
            color: var(--accent-pink);
        }
        b, strong {
            color: #000;
            font-weight: 700;
        }
        em {
            color: #e85d04;
        }
        .note {
            background-color: #fff3cd;
            border-left: 4px solid #ffc107;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .tip {
            background-color: #d1ecf1;
            border-left: 4px solid #0dcaf0;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .warning {
            background-color: #f8d7da;
            border-left: 4px solid #dc3545;
            padding: 1rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius) var(--radius) 0;
        }
        .article-img {
            margin: 3rem auto;
            max-width: 900px;
            text-align: center;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-img img {
            width: 100%;
            transition: transform 0.5s ease;
        }
        .article-img img:hover {
            transform: scale(1.02);
        }
        .article-img figcaption {
            font-size: 0.9rem;
            color: #6c757d;
            padding: 1rem;
            background-color: var(--light-bg);
        }
        ul, ol {
            margin-left: 2rem;
            margin-bottom: 1.5rem;
        }
        li {
            margin-bottom: 0.8rem;
        }
        .sidebar {
            background-color: var(--light-bg);
            padding: 2rem;
            border-radius: var(--radius);
            align-self: start;
            position: sticky;
            top: 20px;
        }
        .sidebar h3 {
            font-size: 1.4rem;
            margin-top: 0;
            padding-bottom: 0.8rem;
            border-bottom: 1px solid var(--gray-border);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar h3 i {
            color: var(--accent-pink);
        }
        .toc-list {
            list-style: none;
            margin-left: 0;
        }
        .toc-list li {
            margin-bottom: 0.8rem;
            padding-left: 1rem;
            border-left: 3px solid transparent;
            transition: all 0.2s ease;
        }
        .toc-list li:hover {
            border-left-color: var(--primary-blue);
            padding-left: 1.2rem;
        }
        .toc-list a {
            color: #495057;
            display: block;
        }
        .related-links {
            margin-top: 3rem;
        }
        .related-links ul {
            list-style: none;
            margin-left: 0;
        }
        .related-links li {
            padding: 0.8rem;
            background: white;
            margin-bottom: 0.8rem;
            border-radius: var(--radius);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }
        .related-links li:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .rating-section, .comments-section {
            background-color: var(--light-bg);
            padding: 2.5rem;
            border-radius: var(--radius);
            margin: 3rem 0;
        }
        .rating-form, .comment-form {
            display: grid;
            gap: 1.2rem;
            margin-top: 1.5rem;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            font-size: 2rem;
            color: #ffd700;
            margin: 1rem 0;
            cursor: pointer;
        }
        .star-rating .star:hover,
        .star-rating .star:hover ~ .star {
            color: #ffd700;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .form-label {
            font-weight: 600;
        }
        .form-input, .form-textarea {
            padding: 1rem;
            border: 1px solid var(--gray-border);
            border-radius: var(--radius);
            font-size: 1rem;
            font-family: inherit;
        }
        .form-input:focus, .form-textarea:focus {
            outline: 2px solid var(--primary-blue);
        }
        .form-textarea {
            min-height: 150px;
            resize: vertical;
        }
        .submit-btn {
            background: linear-gradient(90deg, var(--primary-blue), var(--secondary-purple));
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: var(--radius);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: opacity 0.2s ease;
            justify-self: start;
        }
        .submit-btn:hover {
            opacity: 0.9;
        }
        .site-footer {
            margin-top: 5rem;
            padding-top: 3rem;
            border-top: 1px solid var(--gray-border);
            color: #6c757d;
            font-size: 0.95rem;
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 2rem;
            margin-bottom: 3rem;
        }
        .footer-column h4 {
            font-size: 1.2rem;
            margin-top: 0;
            color: var(--dark-text);
        }
        friend-link {
            display: block;
            margin: 0.5rem 0;
        }
        .copyright {
            text-align: center;
            padding: 2rem 0;
            background-color: var(--light-bg);
            border-radius: var(--radius);
            margin-top: 2rem;
        }
        @media (max-width: 768px) {
            body {
                padding: 0 15px;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.4rem;
            }
            .my-logo {
                font-size: 2.2rem;
            }
            .main-nav {
                flex-direction: column;
                display: none;
                width: 100%;
                gap: 0;
            }
            .main-nav.active {
                display: flex;
            }
            .main-nav a {
                padding: 1rem;
                border-bottom: 1px solid rgba(0,0,0,0.05);
            }
            .hamburger {
                display: block;
            }
            .content-wrapper {
                gap: 2rem;
            }
            .rating-section, .comments-section {
                padding: 1.5rem;
            }
        }