* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f8f9fa;
            color: #1a1a2e;
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: #e63946;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #b71c1c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            padding: 18px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 28px;
            font-weight: 800;
            color: #fff;
            letter-spacing: 1.5px;
            background: linear-gradient(135deg, #f9d423, #e63946);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.03);
            text-decoration: none;
        }
        .my-logo i {
            -webkit-text-fill-color: #f9d423;
            margin-right: 6px;
        }
        .hamburger {
            display: none;
            font-size: 28px;
            color: #fff;
            cursor: pointer;
            background: none;
            border: none;
            padding: 6px 12px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .nav-menu {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .nav-menu a {
            color: #e0e0e0;
            padding: 8px 16px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 15px;
            transition: all 0.2s;
        }
        .nav-menu a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #f9d423;
            text-decoration: none;
        }
        .nav-menu a i {
            margin-right: 5px;
        }
        .breadcrumb {
            background: #fff;
            padding: 12px 0;
            border-bottom: 1px solid #e9ecef;
            font-size: 14px;
            color: #6c757d;
        }
        .breadcrumb a {
            color: #e63946;
        }
        .breadcrumb a:hover {
            color: #b71c1c;
        }
        .breadcrumb span {
            margin: 0 6px;
            color: #adb5bd;
        }
        main {
            padding: 40px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-body h1 {
            font-size: 38px;
            font-weight: 800;
            color: #1a1a2e;
            margin-bottom: 12px;
            line-height: 1.2;
        }
        .article-body .meta {
            color: #6c757d;
            font-size: 15px;
            margin-bottom: 28px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .article-body .meta i {
            margin-right: 5px;
        }
        .article-body h2 {
            font-size: 28px;
            font-weight: 700;
            color: #1a1a2e;
            margin-top: 48px;
            margin-bottom: 16px;
            border-left: 5px solid #e63946;
            padding-left: 16px;
        }
        .article-body h3 {
            font-size: 22px;
            font-weight: 600;
            color: #16213e;
            margin-top: 32px;
            margin-bottom: 12px;
        }
        .article-body h4 {
            font-size: 18px;
            font-weight: 600;
            color: #2d3436;
            margin-top: 24px;
            margin-bottom: 8px;
        }
        .article-body p {
            margin-bottom: 18px;
            color: #2d3436;
        }
        .article-body p strong {
            color: #1a1a2e;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 20px;
            padding-left: 26px;
            color: #2d3436;
        }
        .article-body li {
            margin-bottom: 6px;
        }
        .article-body .feature-img {
            margin: 30px 0;
            border-radius: 14px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
        }
        .article-body .feature-img figcaption {
            text-align: center;
            font-size: 14px;
            color: #6c757d;
            margin-top: 8px;
            font-style: italic;
        }
        .highlight-box {
            background: linear-gradient(135deg, #fff5f5, #fff9e6);
            border-left: 5px solid #e63946;
            padding: 20px 24px;
            border-radius: 10px;
            margin: 24px 0;
        }
        .highlight-box p {
            margin-bottom: 0;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 24px 0;
        }
        .table-wrap table {
            width: 100%;
            border-collapse: collapse;
            font-size: 15px;
        }
        .table-wrap th {
            background: #1a1a2e;
            color: #fff;
            padding: 12px 16px;
            text-align: left;
        }
        .table-wrap td {
            padding: 10px 16px;
            border-bottom: 1px solid #e9ecef;
        }
        .table-wrap tr:nth-child(even) {
            background: #f8f9fa;
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 14px;
            padding: 22px;
            margin-bottom: 24px;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
            border: 1px solid #e9ecef;
        }
        .sidebar-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: #1a1a2e;
            margin-bottom: 14px;
            border-bottom: 2px solid #f9d423;
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-card ul li {
            padding: 6px 0;
        }
        .sidebar-card ul li a {
            color: #2d3436;
            font-weight: 500;
        }
        .sidebar-card ul li a:hover {
            color: #e63946;
        }
        .sidebar-card ul li i {
            color: #e63946;
            margin-right: 8px;
            font-size: 12px;
        }
        .search-form {
            display: flex;
            gap: 8px;
            margin: 20px 0;
        }
        .search-form input {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid #dee2e6;
            border-radius: 10px;
            font-size: 16px;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: #e63946;
        }
        .search-form button {
            padding: 12px 24px;
            background: #e63946;
            color: #fff;
            border: none;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .search-form button:hover {
            background: #b71c1c;
        }
        .feedback-section {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 2px solid #e9ecef;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        .feedback-card {
            background: #fff;
            border-radius: 14px;
            padding: 24px;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
            border: 1px solid #e9ecef;
        }
        .feedback-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 14px;
            color: #1a1a2e;
        }
        .feedback-card h3 i {
            color: #e63946;
            margin-right: 8px;
        }
        .feedback-card form label {
            display: block;
            font-weight: 600;
            margin-bottom: 4px;
            color: #2d3436;
        }
        .feedback-card form input,
        .feedback-card form textarea,
        .feedback-card form select {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid #dee2e6;
            border-radius: 8px;
            font-size: 15px;
            margin-bottom: 14px;
            outline: none;
            transition: border 0.2s;
            font-family: inherit;
        }
        .feedback-card form input:focus,
        .feedback-card form textarea:focus,
        .feedback-card form select:focus {
            border-color: #e63946;
        }
        .feedback-card form textarea {
            resize: vertical;
            min-height: 90px;
        }
        .feedback-card form .btn-submit {
            padding: 10px 28px;
            background: #1a1a2e;
            color: #fff;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .feedback-card form .btn-submit:hover {
            background: #16213e;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
            margin-bottom: 14px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 28px;
            color: #dee2e6;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f9d423;
        }
        footer {
            background: #1a1a2e;
            color: #e0e0e0;
            padding: 40px 0 20px;
        }
        footer .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 30px;
        }
        footer h4 {
            color: #f9d423;
            font-size: 18px;
            margin-bottom: 14px;
        }
        footer a {
            color: #adb5bd;
        }
        footer a:hover {
            color: #f9d423;
            text-decoration: none;
        }
        friend-link {
            display: block;
            margin-top: 8px;
        }
        friend-link a {
            display: inline-block;
            margin-right: 16px;
            margin-bottom: 6px;
            color: #adb5bd;
        }
        friend-link a:hover {
            color: #f9d423;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            margin-top: 20px;
            border-top: 1px solid #2d3436;
            font-size: 14px;
            color: #6c757d;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            footer .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                padding-top: 16px;
                gap: 4px;
            }
            .nav-menu.active {
                display: flex;
            }
            .nav-menu a {
                width: 100%;
                padding: 12px 16px;
                border-radius: 6px;
            }
            .header-inner {
                align-items: center;
            }
            .my-logo {
                font-size: 22px;
            }
            .article-body h1 {
                font-size: 28px;
            }
            .article-body h2 {
                font-size: 22px;
            }
            .article-body h3 {
                font-size: 18px;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            footer .footer-inner {
                grid-template-columns: 1fr;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .article-body h1 {
                font-size: 24px;
            }
            .breadcrumb {
                font-size: 12px;
            }
            .feedback-card {
                padding: 16px;
            }
        }
        .last-updated {
            display: inline-block;
            background: #e9ecef;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            color: #495057;
        }
        .toc {
            background: #fff;
            border-radius: 12px;
            padding: 20px 24px;
            border: 1px solid #e9ecef;
            margin-bottom: 30px;
        }
        .toc h3 {
            font-size: 20px;
            margin-bottom: 12px;
            color: #1a1a2e;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            columns: 2;
            column-gap: 24px;
        }
        .toc ul li {
            padding: 4px 0;
            break-inside: avoid;
        }
        .toc ul li a {
            color: #2d3436;
            font-weight: 500;
        }
        .toc ul li a:hover {
            color: #e63946;
        }
        @media (max-width: 600px) {
            .toc ul {
                columns: 1;
            }
        }