:root {
            --primary-color: #1a237e;
            --secondary-color: #3949ab;
            --accent-color: #536dfe;
            --light-bg: #f5f5f7;
            --dark-bg: #121212;
            --text-dark: #212121;
            --text-light: #f5f5f5;
            --border-color: #e0e0e0;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        * {
            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, Cantarell, sans-serif;
            line-height: 1.7;
            color: var(--text-dark);
            background-color: #ffffff;
            overflow-x: hidden;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 1rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow);
        }
        .header-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.05);
            color: #ffd700;
        }
        .my-logo i {
            color: var(--accent-color);
        }
        .main-nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        .nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: var(--transition);
            position: relative;
        }
        .nav-links a:hover,
        .nav-links a.active {
            background-color: rgba(255, 255, 255, 0.15);
            color: #ffd700;
        }
        .nav-links a:after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: 0;
            left: 50%;
            background-color: #ffd700;
            transition: var(--transition);
        }
        .nav-links a:hover:after {
            width: 80%;
            left: 10%;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.5rem;
        }
        .breadcrumb {
            background-color: var(--light-bg);
            padding: 1rem 2rem;
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb ol {
            display: flex;
            list-style: none;
            gap: 0.5rem;
            max-width: 1400px;
            margin: 0 auto;
            flex-wrap: wrap;
        }
        .breadcrumb li:not(:last-child):after {
            content: "›";
            margin-left: 0.5rem;
            color: var(--secondary-color);
        }
        .breadcrumb a {
            color: var(--secondary-color);
            text-decoration: none;
            transition: var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary-color);
            text-decoration: underline;
        }
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 2rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 3rem;
        }
        .main-content {
            padding: 3rem 0;
        }
        .sidebar {
            padding: 3rem 0;
        }
        .widget {
            background: var(--light-bg);
            border-radius: 10px;
            padding: 1.5rem;
            margin-bottom: 2rem;
            box-shadow: var(--shadow);
        }
        .widget h3 {
            color: var(--primary-color);
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--accent-color);
        }
        h1 {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
            line-height: 1.2;
            position: relative;
            padding-bottom: 1rem;
        }
        h1:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent-color), #ff4081);
            border-radius: 2px;
        }
        h2 {
            font-size: 2.2rem;
            color: var(--secondary-color);
            margin: 3rem 0 1.5rem;
            padding-top: 1rem;
            border-top: 1px solid var(--border-color);
        }
        h3 {
            font-size: 1.8rem;
            color: var(--primary-color);
            margin: 2.5rem 0 1rem;
        }
        h4 {
            font-size: 1.4rem;
            color: #444;
            margin: 2rem 0 1rem;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.5rem;
            text-align: justify;
            hyphens: auto;
        }
        .lead {
            font-size: 1.3rem;
            color: #555;
            font-weight: 500;
            background: linear-gradient(to right, var(--light-bg), transparent);
            padding: 1.5rem;
            border-left: 4px solid var(--accent-color);
            border-radius: 0 8px 8px 0;
            margin: 2rem 0;
        }
        .highlight {
            background-color: rgba(83, 109, 254, 0.1);
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
            border-left: 4px solid var(--accent-color);
        }
        .stat-box {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2.5rem 0;
        }
        .stat-item {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            box-shadow: var(--shadow);
            text-align: center;
            border-top: 4px solid var(--accent-color);
            transition: var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary-color);
            display: block;
            margin-bottom: 0.5rem;
        }
        .article-image {
            width: 100%;
            max-width: 800px;
            height: auto;
            border-radius: 12px;
            margin: 2rem auto;
            display: block;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
        }
        .article-image:hover {
            transform: scale(1.01);
            box-shadow: 0 12px 35px rgba(0, 0, 0, 0.2);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #666;
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        a.content-link {
            color: var(--secondary-color);
            text-decoration: none;
            border-bottom: 1px dotted var(--secondary-color);
            transition: var(--transition);
            padding: 0 2px;
        }
        a.content-link:hover {
            color: var(--primary-color);
            border-bottom: 2px solid var(--primary-color);
            background-color: rgba(26, 35, 126, 0.05);
        }
        ul.feature-list,
        ol.guide-list {
            margin: 1.5rem 0 1.5rem 2rem;
        }
        ul.feature-list li,
        ol.guide-list li {
            margin-bottom: 0.8rem;
            position: relative;
        }
        ul.feature-list li:before {
            content: "🎵";
            position: absolute;
            left: -1.8rem;
        }
        .search-form,
        .comment-form,
        .rating-form {
            background: white;
            padding: 1.8rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            margin: 2.5rem 0;
        }
        .form-group {
            margin-bottom: 1.5rem;
        }
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: #444;
        }
        .form-control {
            width: 100%;
            padding: 0.8rem 1rem;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .form-control:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(83, 109, 254, 0.2);
        }
        textarea.form-control {
            min-height: 150px;
            resize: vertical;
        }
        .btn {
            display: inline-block;
            background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
            color: white;
            padding: 0.8rem 2rem;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            font-size: 1rem;
            text-decoration: none;
        }
        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 15px rgba(83, 109, 254, 0.4);
        }
        .btn-block {
            display: block;
            width: 100%;
            text-align: center;
        }
        .star-rating {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #ddd;
            font-size: 2rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover ~ label,
        .star-rating input:checked ~ label {
            color: #ffd700;
        }
        .comments-section {
            margin: 3rem 0;
        }
        .comment {
            background: white;
            padding: 1.5rem;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            border-left: 3px solid var(--border-color);
        }
        .comment-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 1rem;
            color: #666;
            font-size: 0.9rem;
        }
        .comment-author {
            font-weight: 600;
            color: var(--primary-color);
        }
        .related-links {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 1rem;
            margin: 2.5rem 0;
        }
        .related-link-item {
            background: var(--light-bg);
            padding: 1.2rem;
            border-radius: 8px;
            text-decoration: none;
            color: var(--text-dark);
            transition: var(--transition);
            border: 1px solid transparent;
        }
        .related-link-item:hover {
            background: white;
            border-color: var(--accent-color);
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        .related-link-item i {
            color: var(--accent-color);
            margin-right: 0.5rem;
        }
        .site-footer {
            background: var(--dark-bg);
            color: var(--text-light);
            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 h3 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.3rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 0.8rem;
        }
        .footer-links a {
            color: #bbb;
            text-decoration: none;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            padding: 1rem;
            border-radius: 6px;
            margin-bottom: 1rem;
            border-left: 3px solid var(--accent-color);
        }
        friend-link a {
            color: #bbb;
            text-decoration: none;
            transition: var(--transition);
        }
        friend-link a:hover {
            color: white;
        }
        .copyright {
            text-align: center;
            padding-top: 2rem;
            margin-top: 2rem;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: #999;
            font-size: 0.9rem;
        }
        .update-time {
            background: rgba(255, 215, 0, 0.1);
            padding: 0.8rem;
            border-radius: 6px;
            margin: 1.5rem 0;
            color: #b8860b;
            font-size: 0.9rem;
            border-left: 3px solid #ffd700;
        }
        @media (max-width: 1024px) {
            .container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            h1 {
                font-size: 2.5rem;
            }
            h2 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                margin-top: 1rem;
                background: rgba(26, 35, 126, 0.95);
                padding: 1rem;
                border-radius: 8px;
            }
            .nav-links.active {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .site-header {
                padding: 1rem;
            }
            .container {
                padding: 0 1rem;
            }
            .breadcrumb {
                padding: 1rem;
            }
            .footer-container {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .stat-box {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.7rem;
            }
            .lead {
                font-size: 1.1rem;
                padding: 1rem;
            }
            .search-form,
            .comment-form,
            .rating-form {
                padding: 1.2rem;
            }
        }
        @media print {
            .site-header,
            .sidebar,
            .search-form,
            .comment-form,
            .rating-form,
            .site-footer {
                display: none;
            }
            body {
                color: black;
                background: white;
            }
            .container {
                max-width: 100%;
                grid-template-columns: 1fr;
                padding: 0;
            }
            a {
                color: black;
                text-decoration: underline;
            }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        *:focus {
            outline: 2px solid var(--accent-color);
            outline-offset: 2px;
        }
        img {
            max-width: 100%;
            height: auto;
        }