* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: #f5f7fa;
            color: #1a1a2e;
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #004999;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(145deg, #0f0c29, #302b63, #24243e);
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(135deg, #f7971e, #ffd200);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #f7971e;
            font-size: 1.6rem;
        }
        .my-logo small {
            font-size: 0.75rem;
            -webkit-text-fill-color: initial;
            color: rgba(255, 255, 255, 0.5);
            font-weight: 400;
            letter-spacing: 0.3px;
        }
        .my-logo:hover {
            text-decoration: none;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 8px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .nav-menu a {
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.92rem;
            font-weight: 500;
            padding: 6px 14px;
            border-radius: 20px;
            transition: all 0.25s;
        }
        .nav-menu a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            text-decoration: none;
        }
        .nav-menu a.active {
            background: #f7971e;
            color: #1a1a2e;
        }
        .breadcrumb {
            background: #eef0f5;
            padding: 12px 0;
            font-size: 0.85rem;
            color: #555;
        }
        .breadcrumb-inner {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb-inner a {
            color: #0066cc;
        }
        .breadcrumb-inner span {
            color: #888;
        }
        .main-wrap {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        @media (max-width: 980px) {
            .main-wrap {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 12px;
            color: #0f0c29;
        }
        .article-body h1 i {
            color: #f7971e;
            margin-right: 8px;
        }
        .article-body .meta-info {
            color: #777;
            font-size: 0.92rem;
            margin-bottom: 28px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            border-bottom: 1px solid #e0e0e0;
            padding-bottom: 16px;
        }
        .article-body .meta-info i {
            margin-right: 4px;
        }
        .article-body h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin-top: 48px;
            margin-bottom: 16px;
            color: #1a1a2e;
            border-left: 5px solid #f7971e;
            padding-left: 16px;
        }
        .article-body h3 {
            font-size: 1.45rem;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 12px;
            color: #2d2d4e;
        }
        .article-body h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-top: 24px;
            margin-bottom: 8px;
            color: #3a3a5c;
        }
        .article-body p {
            margin-bottom: 18px;
            color: #2c2c3e;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 24px 28px;
        }
        .article-body li {
            margin-bottom: 10px;
        }
        .article-body .highlight-box {
            background: #fef9e7;
            border-left: 4px solid #f7971e;
            padding: 20px 24px;
            border-radius: 8px;
            margin: 24px 0;
        }
        .article-body .highlight-box strong {
            color: #b45309;
        }
        .article-body .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 0.95rem;
        }
        .article-body .data-table th {
            background: #302b63;
            color: #fff;
            padding: 12px 16px;
            text-align: left;
        }
        .article-body .data-table td {
            padding: 10px 16px;
            border-bottom: 1px solid #ddd;
        }
        .article-body .data-table tr:nth-child(even) {
            background: #f8f8fc;
        }
        .featured-image {
            margin: 28px 0;
            border-radius: 14px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 14px;
            padding: 24px 20px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: #0f0c29;
            border-bottom: 2px solid #f0f0f0;
            padding-bottom: 10px;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card ul li {
            margin-bottom: 8px;
        }
        .sidebar-card ul li a {
            font-size: 0.92rem;
            display: block;
            padding: 6px 0;
            border-bottom: 1px solid #f5f5f5;
        }
        .sidebar-card ul li a::before {
            content: "▸ ";
            color: #f7971e;
            font-weight: 700;
        }
        .search-form {
            display: flex;
            gap: 8px;
        }
        .search-form input {
            flex: 1;
            padding: 10px 14px;
            border: 2px solid #e0e0e0;
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.25s;
        }
        .search-form input:focus {
            border-color: #f7971e;
        }
        .search-form button {
            background: #f7971e;
            border: none;
            color: #fff;
            padding: 10px 18px;
            border-radius: 30px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.25s;
        }
        .search-form button:hover {
            background: #d97e00;
        }
        .feedback-section {
            background: #fff;
            border-radius: 14px;
            padding: 32px 28px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            margin-top: 48px;
        }
        .feedback-section h2 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 8px;
            border-left: none;
            padding-left: 0;
        }
        .feedback-section .subtitle {
            color: #777;
            margin-bottom: 24px;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }
        @media (max-width: 700px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-group label {
            font-weight: 600;
            display: block;
            margin-bottom: 6px;
            color: #2d2d4e;
        }
        .feedback-group input,
        .feedback-group textarea,
        .feedback-group select {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.25s;
            font-family: inherit;
        }
        .feedback-group input:focus,
        .feedback-group textarea:focus,
        .feedback-group select:focus {
            border-color: #f7971e;
        }
        .feedback-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-group .stars {
            display: flex;
            gap: 6px;
            font-size: 1.8rem;
            color: #ccc;
            cursor: pointer;
        }
        .feedback-group .stars i {
            transition: color 0.2s;
        }
        .feedback-group .stars i:hover,
        .feedback-group .stars i.active {
            color: #f7971e;
        }
        .btn-submit {
            background: #302b63;
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s;
            margin-top: 8px;
        }
        .btn-submit:hover {
            background: #1f1b4a;
        }
        .site-footer {
            background: #0f0c29;
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 28px;
            margin-top: 60px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        @media (max-width: 700px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }
        .footer-grid h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 14px;
        }
        .footer-grid a {
            color: rgba(255, 255, 255, 0.7);
            display: block;
            margin-bottom: 6px;
            font-size: 0.92rem;
        }
        .footer-grid a:hover {
            color: #f7971e;
            text-decoration: none;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 24px;
            text-align: center;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom .copyright {
            margin-top: 8px;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.04);
            padding: 16px 20px;
            border-radius: 10px;
            margin-top: 12px;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            color: rgba(255, 255, 255, 0.7);
        }
        friend-link a:hover {
            color: #f7971e;
        }
        @media (max-width: 820px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: stretch;
                padding-top: 12px;
                gap: 4px;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 10px 14px;
                border-radius: 8px;
            }
            .article-body h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.2rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 600px) {
            .data-table {
                font-size: 0.82rem;
            }
            .data-table th,
            .data-table td {
                padding: 8px 10px;
            }
            .feedback-section {
                padding: 20px 16px;
            }
            .sidebar {
                position: static;
            }
            .container {
                padding: 0 14px;
            }
        }
        .author-badge {
            display: flex;
            align-items: center;
            gap: 14px;
            background: #f0f2f8;
            padding: 14px 20px;
            border-radius: 12px;
            margin: 24px 0;
        }
        .author-badge .avatar {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: #302b63;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.6rem;
            font-weight: 700;
        }
        .author-badge .info strong {
            display: block;
            font-size: 1rem;
        }
        .author-badge .info span {
            font-size: 0.85rem;
            color: #666;
        }
        .toc {
            background: #f8f9fc;
            border-radius: 12px;
            padding: 20px 24px;
            margin: 24px 0;
            border: 1px solid #e8e8f0;
        }
        .toc strong {
            font-size: 1.05rem;
            display: block;
            margin-bottom: 10px;
        }
        .toc ol {
            margin: 0 0 0 20px;
        }
        .toc ol li {
            margin-bottom: 4px;
        }
        .toc ol li a {
            color: #302b63;
        }