*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #0f5e8a;
            --primary-dark: #093a5c;
            --accent: #f0a500;
            --accent-hover: #d18e00;
            --bg: #f4f6f8;
            --card-bg: #ffffff;
            --text: #1a2a3a;
            --muted: #5a6a7a;
            --border: #e2e8f0;
            --radius: 14px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent);
            text-decoration: underline;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-wrap {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 24px;
            flex-wrap: wrap;
            gap: 10px;
        }
        .my-logo {
            font-size: 1.65rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 1px;
            background: rgba(255, 255, 255, 0.12);
            padding: 6px 18px;
            border-radius: 36px;
            border: 2px solid rgba(255, 255, 255, 0.25);
            transition: var(--transition);
        }
        .my-logo:hover {
            background: rgba(255, 255, 255, 0.22);
            transform: scale(1.02);
            text-decoration: none;
            color: #fff;
        }
        .my-logo i {
            color: var(--accent);
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.7rem;
            cursor: pointer;
            line-height: 1;
        }
        .main-nav {
            display: flex;
            gap: 6px;
            align-items: center;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.9);
            padding: 8px 14px;
            border-radius: 30px;
            font-size: 0.92rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
            text-decoration: none;
            transform: translateY(-1px);
        }
        .breadcrumb-wrap {
            max-width: 1280px;
            margin: 0 auto;
            padding: 20px 24px 0;
            font-size: 0.85rem;
            color: var(--muted);
        }
        .breadcrumb-wrap nav ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .breadcrumb-wrap li+li::before {
            content: "/";
            margin: 0 8px 0 4px;
            color: #b0bcc8;
        }
        .breadcrumb-wrap a {
            color: var(--primary);
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 30px;
            padding: 24px;
        }
        .main-content {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 36px 40px;
            min-width: 0;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .widget {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            padding: 24px;
        }
        .widget-title {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--bg);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .widget-title i {
            color: var(--accent);
        }
        .widget ul {
            list-style: none;
        }
        .widget ul li {
            margin-bottom: 8px;
        }
        .widget ul li a {
            font-size: 0.9rem;
            display: block;
            padding: 6px 10px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .widget ul li a:hover {
            background: #f0f4f8;
            padding-left: 14px;
            text-decoration: none;
        }
        .article-header {
            margin-bottom: 28px;
        }
        .article-header h1 {
            font-size: 2.2rem;
            line-height: 1.25;
            margin-bottom: 12px;
            color: var(--primary-dark);
        }
        .article-meta {
            display: flex;
            gap: 18px;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--muted);
            margin-bottom: 10px;
        }
        .article-meta i {
            margin-right: 4px;
            color: var(--accent);
        }
        .lead {
            font-size: 1.15rem;
            color: #2c3e50;
            border-left: 4px solid var(--accent);
            padding-left: 16px;
            margin: 20px 0;
            background: #fef8ec;
            border-radius: 0 10px 10px 0;
            padding: 14px 18px;
        }
        .article-content h2 {
            font-size: 1.6rem;
            margin-top: 40px;
            margin-bottom: 16px;
            color: var(--primary);
            border-bottom: 2px solid #eef2f5;
            padding-bottom: 10px;
        }
        .article-content h3 {
            font-size: 1.25rem;
            margin-top: 28px;
            margin-bottom: 10px;
            color: var(--primary-dark);
        }
        .article-content h4 {
            font-size: 1.05rem;
            margin-top: 20px;
            margin-bottom: 8px;
            color: #34495e;
            font-weight: 600;
        }
        .article-content p {
            margin-bottom: 16px;
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 16px 20px;
        }
        .article-content li {
            margin-bottom: 6px;
        }
        .article-content strong {
            color: var(--primary-dark);
        }
        .feature-img {
            border-radius: var(--radius);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .feature-img img {
            border-radius: var(--radius);
        }
        .img-caption {
            font-size: 0.8rem;
            color: var(--muted);
            text-align: center;
            margin-top: 6px;
            font-style: italic;
        }
        .callout-box {
            background: #e8f4fd;
            border: 1px solid #b8d8f0;
            border-radius: 10px;
            padding: 16px 20px;
            margin: 24px 0;
            font-size: 0.95rem;
        }
        .callout-box i {
            color: var(--primary);
            margin-right: 8px;
        }
        .tip-box {
            background: #eaf7ee;
            border: 1px solid #c3e6cb;
            border-radius: 10px;
            padding: 14px 18px;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.92rem;
        }
        table th,
        table td {
            border: 1px solid var(--border);
            padding: 10px 12px;
            text-align: left;
        }
        table th {
            background: #f0f4f8;
            font-weight: 600;
        }
        table tr:nth-child(even) {
            background: #fafbfc;
        }
        .search-box {
            display: flex;
            gap: 8px;
            margin: 20px 0;
        }
        .search-box input {
            flex: 1;
            padding: 12px 16px;
            border: 2px solid var(--border);
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
        }
        .search-box input:focus {
            border-color: var(--primary);
        }
        .search-box button {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 0 20px;
            border-radius: 30px;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .search-box button:hover {
            background: var(--primary-dark);
        }
        .comments-section {
            margin-top: 40px;
            padding-top: 30px;
            border-top: 2px solid var(--bg);
        }
        .comment-form textarea {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid var(--border);
            border-radius: 10px;
            font-size: 0.95rem;
            min-height: 100px;
            resize: vertical;
            outline: none;
            transition: var(--transition);
            font-family: inherit;
            margin-bottom: 10px;
        }
        .comment-form textarea:focus {
            border-color: var(--primary);
        }
        .comment-form input {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: 10px;
            margin-bottom: 10px;
            font-size: 0.9rem;
        }
        .comment-form button {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 10px 24px;
            border-radius: 30px;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
        }
        .comment-form button:hover {
            background: var(--primary-dark);
        }
        .rating-section {
            margin-top: 20px;
            padding: 20px;
            background: #fafbfd;
            border-radius: 10px;
            border: 1px solid var(--border);
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.6rem;
            cursor: pointer;
            color: #ccc;
            margin: 10px 0;
        }
        .star-rating i:hover,
        .star-rating i.active {
            color: var(--accent);
        }
        .rating-form select {
            padding: 8px 12px;
            border-radius: 8px;
            border: 1px solid var(--border);
            font-size: 0.9rem;
            margin-right: 8px;
        }
        .rating-form button {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.9rem;
            cursor: pointer;
        }
        .rating-form button:hover {
            background: var(--accent-hover);
        }
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.8);
            margin-top: 40px;
            padding: 40px 24px 20px;
        }
        .footer-wrap {
            max-width: 1280px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 30px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            margin-top: 10px;
        }
        .footer-links h4 {
            color: #fff;
            margin-bottom: 12px;
            font-size: 1rem;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 6px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.85rem;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        friend-link {
            display: block;
            margin-top: 24px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            font-size: 0.82rem;
            line-height: 1.6;
        }
        friend-link a {
            color: rgba(255, 255, 255, 0.6);
            margin: 0 6px;
        }
        .copyright {
            text-align: center;
            font-size: 0.8rem;
            padding-top: 16px;
            margin-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 992px) {
            .container {
                grid-template-columns: 1fr;
                padding: 16px;
            }
            .main-content {
                padding: 24px 20px;
            }
            .article-header h1 {
                font-size: 1.7rem;
            }
            .footer-wrap {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        @media (max-width: 768px) {
            .header-wrap {
                padding: 10px 16px;
            }
            .nav-toggle {
                display: block;
                background: none;
                border: none;
                color: #fff;
                font-size: 1.5rem;
                cursor: pointer;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 10px 0;
                background: var(--primary);
                border-radius: 10px;
                margin-top: 8px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 10px 16px;
            }
            .breadcrumb-wrap {
                padding: 14px 16px 0;
            }
            .search-box {
                flex-direction: column;
            }
            .search-box button {
                padding: 12px;
            }
        }
        @media (max-width: 480px) {
            .main-content {
                padding: 18px 14px;
            }
            .article-header h1 {
                font-size: 1.4rem;
            }
            .article-meta {
                flex-direction: column;
                gap: 6px;
            }
            .feature-img {
                margin: 16px 0;
            }
        }
        .toc {
            background: #f0f4f8;
            border-radius: 10px;
            padding: 18px 24px;
            margin: 24px 0;
            font-size: 0.9rem;
        }
        .toc-title {
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .toc ol {
            margin-left: 20px;
            columns: 2;
            column-gap: 30px;
        }
        .toc li {
            margin-bottom: 4px;
        }
        .toc a {
            color: var(--primary);
        }
        .toc a:hover {
            text-decoration: underline;
        }
        @media (max-width: 600px) {
            .toc ol {
                columns: 1;
            }
        }