*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        @media (max-width: 768px) {
            html {
                font-size: 14px;
            }
        }
        body {
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            background: #f4f0eb;
            color: #2c2b28;
            line-height: 1.75;
            padding: 0;
            margin: 0;
        }
        a {
            color: #b85c2e;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #7a3a1a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        header {
            background: #1a1c1d;
            color: #f4f0eb;
            padding: 0.75rem 0;
            border-bottom: 4px solid #b85c2e;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.75rem;
        }
        .my-logo {
            font-size: 1.75rem;
            font-weight: 800;
            letter-spacing: 0.04em;
            color: #f4f0eb;
            text-transform: uppercase;
            background: linear-gradient(135deg, #b85c2e, #d4a373);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: opacity 0.25s;
            display: inline-block;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .my-logo i {
            -webkit-text-fill-color: #f4f0eb;
            margin-right: 0.35rem;
            font-size: 1.4rem;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #b85c2e;
            color: #f4f0eb;
            font-size: 1.4rem;
            padding: 0.3rem 0.7rem;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #b85c2e22;
        }
        .nav-menu {
            display: flex;
            gap: 1.2rem;
            align-items: center;
            flex-wrap: wrap;
            list-style: none;
        }
        .nav-menu a {
            color: #ddd;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .nav-menu a:hover {
            color: #f4a261;
            border-bottom-color: #f4a261;
            text-decoration: none;
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #1a1c1d;
                padding: 1rem 0 0.75rem 0;
                border-top: 1px solid #333;
                margin-top: 0.5rem;
                gap: 0.6rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 0.4rem 0;
                border-bottom: 1px solid #333;
            }
        }
        .breadcrumb {
            background: #e8e2da;
            padding: 0.65rem 0;
            font-size: 0.9rem;
            color: #555;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.6rem;
            padding: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #999;
        }
        .breadcrumb a {
            color: #7a3a1a;
        }
        .hero {
            background: linear-gradient(135deg, #0f1112 0%, #2b2d2a 100%);
            color: #f4f0eb;
            padding: 3rem 0 2.8rem;
            text-align: center;
            position: relative;
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            line-height: 1.2;
            margin-bottom: 0.75rem;
        }
        .hero h1 i {
            color: #b85c2e;
            margin-right: 0.5rem;
        }
        .hero p {
            font-size: 1.15rem;
            max-width: 720px;
            margin: 0 auto 1.2rem;
            color: #ccc;
        }
        .hero .meta-info {
            font-size: 0.95rem;
            color: #a98;
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }
        .hero .meta-info i {
            margin-right: 0.35rem;
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            padding: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body h2 {
            font-size: 1.9rem;
            color: #1a1c1d;
            margin-top: 2.8rem;
            margin-bottom: 1rem;
            border-left: 5px solid #b85c2e;
            padding-left: 1rem;
        }
        .article-body h3 {
            font-size: 1.45rem;
            color: #2c2b28;
            margin-top: 2rem;
            margin-bottom: 0.7rem;
            font-weight: 600;
        }
        .article-body h4 {
            font-size: 1.2rem;
            color: #3d3a36;
            margin-top: 1.4rem;
            margin-bottom: 0.4rem;
            font-weight: 600;
        }
        .article-body p {
            margin-bottom: 1.1rem;
            text-align: justify;
        }
        .article-body ul,
        .article-body ol {
            margin: 0.8rem 0 1.2rem 1.8rem;
        }
        .article-body li {
            margin-bottom: 0.35rem;
        }
        .article-body blockquote {
            border-left: 4px solid #b85c2e;
            background: #ede7df;
            padding: 1rem 1.5rem;
            margin: 1.4rem 0;
            font-style: italic;
            color: #3a3733;
            border-radius: 0 8px 8px 0;
        }
        .article-body blockquote footer {
            margin-top: 0.5rem;
            font-size: 0.9rem;
            font-style: normal;
            color: #777;
        }
        .article-body img {
            border-radius: 12px;
            margin: 1.8rem auto;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
            max-width: 100%;
        }
        .article-body .img-caption {
            text-align: center;
            font-size: 0.9rem;
            color: #666;
            margin-top: -1.2rem;
            margin-bottom: 1.8rem;
        }
        .highlight-box {
            background: #e8e2da;
            border-radius: 12px;
            padding: 1.4rem 1.8rem;
            margin: 1.8rem 0;
            border-left: 6px solid #b85c2e;
        }
        .highlight-box h4 {
            margin-top: 0;
        }
        .btn {
            display: inline-block;
            background: #b85c2e;
            color: #fff;
            padding: 0.6rem 1.4rem;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.9rem;
            border: none;
            cursor: pointer;
            transition: background 0.25s, transform 0.1s;
        }
        .btn:hover {
            background: #9a4b23;
            color: #fff;
            text-decoration: none;
            transform: translateY(-1px);
        }
        .btn i {
            margin-right: 0.4rem;
        }
        .sidebar {
            background: #e8e2da;
            border-radius: 16px;
            padding: 1.8rem 1.5rem;
            align-self: start;
            position: sticky;
            top: 100px;
        }
        .sidebar h3 {
            font-size: 1.3rem;
            margin-bottom: 1.2rem;
            color: #1a1c1d;
            border-bottom: 2px solid #b85c2e;
            padding-bottom: 0.4rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 0.7rem;
            border-bottom: 1px solid #d5ccc2;
            padding-bottom: 0.6rem;
        }
        .sidebar li a {
            font-weight: 500;
            display: block;
            padding: 0.2rem 0;
        }
        .sidebar li a i {
            margin-right: 0.6rem;
            color: #b85c2e;
            width: 1.2rem;
        }
        .search-form {
            display: flex;
            gap: 0.4rem;
            margin: 1.2rem 0 1.8rem;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 2px solid #ccc;
            border-radius: 30px;
            font-size: 0.95rem;
            background: #fff;
            outline: none;
            transition: border-color 0.2s;
        }
        .search-form input[type="text"]:focus {
            border-color: #b85c2e;
        }
        .search-form button {
            background: #b85c2e;
            color: #fff;
            border: none;
            border-radius: 30px;
            padding: 0.6rem 1.2rem;
            cursor: pointer;
            font-size: 0.95rem;
            transition: background 0.25s;
        }
        .search-form button:hover {
            background: #9a4b23;
        }
        .feedback-section {
            background: #ede7df;
            border-radius: 16px;
            padding: 2rem 2rem 1.8rem;
            margin: 2.8rem 0;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 700px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-section h3 {
            font-size: 1.5rem;
            color: #1a1c1d;
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feedback-section h3 i {
            color: #b85c2e;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            font-size: 0.9rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.6rem 0.9rem;
            border: 2px solid #d5ccc2;
            border-radius: 8px;
            font-size: 0.95rem;
            background: #fff;
            transition: border-color 0.2s;
            outline: none;
            font-family: inherit;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #b85c2e;
        }
        .form-group textarea {
            min-height: 90px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.6rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #d5ccc2;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f4a261;
        }
        footer {
            background: #1a1c1d;
            color: #bbb;
            padding: 2.5rem 0 1.8rem;
            margin-top: 3rem;
        }
        footer .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            footer .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        footer h4 {
            color: #f4f0eb;
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
        }
        footer a {
            color: #c9a77b;
        }
        footer a:hover {
            color: #e2c5a7;
        }
        footer .copyright {
            border-top: 1px solid #333;
            margin-top: 2rem;
            padding-top: 1.5rem;
            text-align: center;
            font-size: 0.85rem;
            color: #888;
        }
        friend-link {
            display: block;
            padding: 0.5rem 0;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            margin-bottom: 0.3rem;
        }
        .back-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #b85c2e;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
            transition: background 0.25s, transform 0.2s;
            z-index: 99;
            border: none;
            cursor: pointer;
        }
        .back-top:hover {
            background: #9a4b23;
            transform: translateY(-3px);
            text-decoration: none;
            color: #fff;
        }
        @media (max-width: 768px) {
            .back-top {
                bottom: 1.2rem;
                right: 1.2rem;
                width: 42px;
                height: 42px;
                font-size: 1.1rem;
            }
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 0.95rem;
        }
        .article-body th,
        .article-body td {
            border: 1px solid #d5ccc2;
            padding: 0.6rem 0.9rem;
            text-align: left;
        }
        .article-body th {
            background: #d5ccc2;
            font-weight: 700;
            color: #1a1c1d;
        }
        .article-body tr:nth-child(even) {
            background: #f4f0eb;
        }
        .article-body .toc {
            background: #ede7df;
            border-radius: 12px;
            padding: 1.4rem 1.8rem;
            margin: 1.2rem 0 2rem;
        }
        .article-body .toc h3 {
            margin-top: 0;
        }
        .article-body .toc ul {
            columns: 2;
            column-gap: 2rem;
            list-style: none;
            padding: 0;
        }
        .article-body .toc li {
            break-inside: avoid;
            padding: 0.2rem 0;
        }
        .article-body .toc a {
            display: block;
            padding: 0.2rem 0;
            border-bottom: 1px solid #d5ccc2;
        }
        @media (max-width: 600px) {
            .article-body .toc ul {
                columns: 1;
            }
        }
        .responsive-table {
            overflow-x: auto;
        }
        .last-updated {
            font-size: 0.9rem;
            color: #888;
            text-align: right;
            margin-top: 2rem;
            padding-top: 0.5rem;
            border-top: 1px solid #ddd;
        }