:root {
            --primary: #e2231a;
            --secondary: #ffcb04;
            --dark: #1a1a2e;
            --light: #f8f9fa;
            --accent: #0f4c75;
            --radius: 12px;
            --shadow: 0 4px 20px 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: 'Segoe UI', system-ui, -apple-system, sans-serif;
            line-height: 1.75;
            color: #222;
            background: #fff;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            color: #fff;
            padding: 15px 0;
            box-shadow: 0 2px 15px rgba(0,0,0,0.2);
            position: sticky;
            top: 0;
            z-index: 999;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 15px;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 800;
            color: var(--secondary);
            text-decoration: none;
            letter-spacing: -1px;
            transition: var(--transition);
            line-height: 1;
        }
        .my-logo:hover {
            transform: scale(1.05);
            color: #fff;
        }
        .my-logo span {
            color: #fff;
            font-size: 0.6em;
            vertical-align: middle;
            margin-left: 5px;
        }
        .main-nav {
            display: flex;
            gap: 5px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: rgba(255,255,255,0.85);
            text-decoration: none;
            padding: 8px 14px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .main-nav a:hover {
            background: rgba(255,255,255,0.15);
            color: var(--secondary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #fff;
            cursor: pointer;
            padding: 5px 10px;
        }
        .breadcrumb-wrap {
            background: var(--light);
            padding: 10px 0;
            border-bottom: 1px solid #eee;
            font-size: 0.85rem;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            list-style: none;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            color: #999;
        }
        .breadcrumb a {
            color: var(--accent);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .active {
            color: #666;
        }
        .layout {
            display: grid;
            grid-template-columns: 250px 1fr 280px;
            gap: 30px;
            padding: 30px 0;
        }
        .sidebar-left {
            position: sticky;
            top: 80px;
            align-self: start;
            max-height: calc(100vh - 100px);
            overflow-y: auto;
            scrollbar-width: thin;
        }
        .sidebar-right {
            position: sticky;
            top: 80px;
            align-self: start;
            max-height: calc(100vh - 100px);
            overflow-y: auto;
            scrollbar-width: thin;
        }
        .sidebar-card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 20px;
            margin-bottom: 20px;
        }
        .sidebar-card h4 {
            font-size: 1rem;
            margin-bottom: 12px;
            color: var(--dark);
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
        }
        .sidebar-card ul li {
            margin-bottom: 8px;
        }
        .sidebar-card ul li a {
            color: var(--accent);
            text-decoration: none;
            font-size: 0.9rem;
            display: block;
            padding: 4px 0;
            transition: var(--transition);
        }
        .sidebar-card ul li a:hover {
            color: var(--primary);
            padding-left: 8px;
        }
        .main-content {
            min-width: 0;
        }
        .article-card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 40px;
            margin-bottom: 30px;
        }
        .article-card h1 {
            font-size: 2.5rem;
            color: var(--dark);
            line-height: 1.2;
            margin-bottom: 15px;
            font-weight: 800;
        }
        .article-card h2 {
            font-size: 1.8rem;
            color: var(--dark);
            margin-top: 40px;
            margin-bottom: 15px;
            padding-left: 15px;
            border-left: 5px solid var(--primary);
            font-weight: 700;
        }
        .article-card h3 {
            font-size: 1.3rem;
            color: var(--accent);
            margin-top: 30px;
            margin-bottom: 10px;
            font-weight: 600;
        }
        .article-card h4 {
            font-size: 1.1rem;
            color: #444;
            margin-top: 20px;
            font-weight: 600;
        }
        .article-card p {
            margin-bottom: 15px;
            font-size: 1.05rem;
        }
        .article-card ul,
        .article-card ol {
            margin: 15px 0 25px 25px;
        }
        .article-card li {
            margin-bottom: 8px;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fffbea 0%, #fff5d4 100%);
            border-left: 4px solid var(--secondary);
            padding: 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
        }
        .info-box {
            background: #e8f4fd;
            border-left: 4px solid var(--accent);
            padding: 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
        }
        .warning-box {
            background: #fdf0f0;
            border-left: 4px solid var(--primary);
            padding: 20px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 20px 0;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin: 20px 0;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 20px 0;
        }
        .feature-image {
            margin: 30px 0;
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
        }
        .feature-image img {
            display: block;
            width: 100%;
            border-radius: var(--radius);
        }
        .feature-image figcaption {
            background: rgba(0,0,0,0.7);
            color: #fff;
            padding: 10px 15px;
            font-size: 0.85rem;
            text-align: center;
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            border-radius: 0;
        }
        .search-form {
            display: flex;
            gap: 5px;
            margin: 20px 0;
        }
        .search-form input {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid #eee;
            border-radius: 30px;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-form input:focus {
            outline: none;
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(255, 203, 4, 0.2);
        }
        .search-form button {
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 30px;
            padding: 12px 20px;
            cursor: pointer;
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-form button:hover {
            background: #c11a12;
            transform: translateY(-2px);
        }
        .rating-section {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 30px;
            margin-bottom: 30px;
        }
        .stars {
            display: inline-flex;
            flex-direction: row-reverse;
            gap: 5px;
            font-size: 1.8rem;
        }
        .stars input {
            display: none;
        }
        .stars label {
            color: #ddd;
            cursor: pointer;
            transition: color 0.3s;
        }
        .stars label:hover,
        .stars label:hover~label,
        .stars input:checked~label {
            color: var(--secondary);
        }
        .comment-section {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 30px;
            margin-bottom: 30px;
        }
        .comment-form {
            margin-top: 20px;
        }
        .comment-form textarea {
            width: 100%;
            min-height: 120px;
            padding: 15px;
            border: 2px solid #eee;
            border-radius: var(--radius);
            font-size: 1rem;
            font-family: inherit;
            resize: vertical;
            transition: var(--transition);
        }
        .comment-form textarea:focus {
            outline: none;
            border-color: var(--accent);
        }
        .comment-form input {
            width: 100%;
            padding: 10px 15px;
            border: 2px solid #eee;
            border-radius: var(--radius);
            margin-bottom: 10px;
            font-size: 1rem;
        }
        .comment-form button {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 12px 30px;
            border-radius: 30px;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: #0a3a5a;
            transform: translateY(-2px);
        }
        .toc {
            background: var(--light);
            border-radius: var(--radius);
            padding: 20px;
            margin: 20px 0;
        }
        .toc h4 {
            font-size: 1rem;
            margin-bottom: 10px;
            color: var(--dark);
        }
        .toc ol {
            padding-left: 20px;
            font-size: 0.9rem;
        }
        .toc ol li {
            margin-bottom: 5px;
        }
        .toc a {
            color: var(--accent);
            text-decoration: none;
        }
        .toc a:hover {
            text-decoration: underline;
        }
        .site-footer {
            background: var(--dark);
            color: rgba(255,255,255,0.8);
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-inner h5 {
            color: var(--secondary);
            font-size: 1.1rem;
            margin-bottom: 15px;
        }
        .footer-inner a {
            color: rgba(255,255,255,0.7);
            text-decoration: none;
            font-size: 0.9rem;
            display: block;
            margin-bottom: 8px;
            transition: var(--transition);
        }
        .footer-inner a:hover {
            color: var(--secondary);
            padding-left: 5px;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
        }
        friend-link {
            display: block;
            margin-top: 15px;
            font-size: 0.9rem;
            padding: 10px;
            background: rgba(255,255,255,0.05);
            border-left: 3px solid var(--secondary);
            color: rgba(255,255,255,0.8);
        }
        friend-link a {
            color: var(--secondary) !important;
            display: inline !important;
            padding: 0 5px !important;
        }
        @media (max-width: 1024px) {
            .layout {
                grid-template-columns: 1fr;
            }
            .sidebar-left,
            .sidebar-right {
                position: static;
                max-height: none;
                overflow: visible;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                background: var(--dark);
                padding: 20px;
                box-shadow: 0 10px 30px rgba(0,0,0,0.3);
                border-radius: 0 0 var(--radius) var(--radius);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 20px;
                border-radius: 8px;
            }
            .main-nav a:hover {
                padding-left: 25px;
            }
            .article-card {
                padding: 20px;
            }
            .grid-2,
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
            }
            .article-card h1 {
                font-size: 1.8rem;
            }
            .article-card h2 {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 480px) {
            .header-inner {
                padding: 0 10px;
            }
            .my-logo {
                font-size: 1.6rem;
            }
            .search-form {
                flex-direction: column;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary);
            color: #fff;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0,0,0,0.3);
            transition: var(--transition);
            border: none;
            z-index: 99;
        }
        .scroll-top:hover {
            background: #c11a12;
            transform: translateY(-5px);
        }
        @media print {
            .site-header,
            .site-footer,
            .sidebar-left,
            .sidebar-right,
            .scroll-top,
            .breadcrumb-wrap {
                display: none !important;
            }
            .layout {
                display: block;
            }
            .article-card {
                box-shadow: none;
                padding: 0;
            }
        }