*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f7f4f0;
            color: #2d2a26;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #b45309;
            text-decoration: none;
            transition: color 0.25s, background 0.25s;
        }
        a:hover,
        a:focus {
            color: #7a2e0e;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #1f1b17;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1rem;
        }
        .site-header {
            background: linear-gradient(145deg, #1f3a2d, #2a4a3a);
            color: #fff;
            padding: 0.6rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: 0.04em;
            color: #fcd34d;
            text-shadow: 2px 2px 0 #7a2e0e;
            transition: transform 0.2s;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
            color: #fbbf24;
        }
        .my-logo i {
            margin-right: 0.3rem;
            color: #f59e0b;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .nav-menu a {
            color: #f0ede8;
            padding: 0.5rem 0.9rem;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.95rem;
            transition: background 0.25s, color 0.25s;
            white-space: nowrap;
        }
        .nav-menu a:hover,
        .nav-menu a:focus {
            background: rgba(255, 255, 255, 0.18);
            color: #fcd34d;
            text-decoration: none;
        }
        .nav-menu a.active {
            background: #f59e0b;
            color: #1f3a2d;
        }
        .hamburger {
            display: none;
            background: none;
            border: 2px solid #f0ede8;
            color: #f0ede8;
            font-size: 1.5rem;
            padding: 0.3rem 0.7rem;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.12);
        }
        .breadcrumb {
            background: #ede7e0;
            padding: 0.7rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #d6cdc2;
        }
        .breadcrumb .container {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.3rem;
        }
        .breadcrumb a {
            color: #7a4b2a;
        }
        .breadcrumb a:hover {
            color: #b45309;
        }
        .breadcrumb span {
            color: #5f4d3b;
        }
        .breadcrumb .sep {
            color: #a09283;
            margin: 0 0.2rem;
        }
        main {
            padding: 1.8rem 0 3rem;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        @media (max-width: 920px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.6rem;
            margin-bottom: 0.8rem;
            color: #1f3a2d;
            border-left: 6px solid #f59e0b;
            padding-left: 1rem;
        }
        .article-body h2 {
            font-size: 1.9rem;
            margin: 2.2rem 0 0.8rem;
            color: #2a4a3a;
            border-bottom: 3px solid #e5d5c5;
            padding-bottom: 0.3rem;
        }
        .article-body h3 {
            font-size: 1.5rem;
            margin: 1.8rem 0 0.6rem;
            color: #3d5e4a;
        }
        .article-body h4 {
            font-size: 1.2rem;
            margin: 1.4rem 0 0.4rem;
            color: #4d6e5a;
        }
        .article-body p {
            margin-bottom: 1.2rem;
        }
        .article-body ul,
        .article-body ol {
            margin-bottom: 1.2rem;
        }
        .article-body li {
            margin-bottom: 0.4rem;
        }
        .article-body .highlight {
            background: #fef3c7;
            padding: 0.1rem 0.4rem;
            border-radius: 4px;
        }
        .article-body .key-term {
            font-weight: 700;
            color: #b45309;
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.10);
        }
        .featured-image img {
            width: 100%;
            object-fit: cover;
        }
        .featured-image figcaption {
            background: #ede7e0;
            padding: 0.6rem 1rem;
            font-size: 0.9rem;
            color: #4d3e33;
            text-align: center;
            font-style: italic;
        }
        .last-updated {
            display: inline-block;
            background: #e5d5c5;
            padding: 0.35rem 1.2rem;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #3d2e23;
            margin-bottom: 1.2rem;
        }
        .last-updated i {
            margin-right: 0.4rem;
        }
        .sidebar {
            background: #fffcf8;
            border-radius: 20px;
            padding: 1.8rem 1.5rem;
            box-shadow: 0 4px 18px rgba(0, 0, 0, 0.06);
            border: 1px solid #e5d5c5;
            align-self: start;
            position: sticky;
            top: 90px;
        }
        .sidebar h3 {
            font-size: 1.4rem;
            color: #1f3a2d;
            margin-bottom: 1.2rem;
            border-left: 4px solid #f59e0b;
            padding-left: 0.8rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 0.7rem;
        }
        .sidebar a {
            display: block;
            padding: 0.5rem 0.8rem;
            background: #f7f2eb;
            border-radius: 10px;
            color: #2d2a26;
            font-weight: 500;
            transition: background 0.2s, transform 0.15s;
        }
        .sidebar a:hover {
            background: #f59e0b;
            color: #1f1b17;
            transform: translateX(4px);
            text-decoration: none;
        }
        .sidebar a i {
            margin-right: 0.5rem;
            color: #b45309;
        }
        .search-section {
            margin: 2.5rem 0 1.5rem;
            background: #fffcf8;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            border: 1px solid #e5d5c5;
        }
        .search-section h3 {
            font-size: 1.6rem;
            color: #1f3a2d;
            margin-bottom: 0.8rem;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 200px;
            padding: 0.8rem 1.2rem;
            border: 2px solid #d6cdc2;
            border-radius: 50px;
            font-size: 1rem;
            outline: none;
            transition: border 0.25s;
            background: #fff;
        }
        .search-form input:focus {
            border-color: #b45309;
        }
        .search-form button {
            background: #b45309;
            color: #fff;
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form button:hover {
            background: #7a2e0e;
            transform: scale(1.02);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0;
        }
        @media (max-width: 700px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .comment-section,
        .rating-section {
            background: #fffcf8;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            border: 1px solid #e5d5c5;
        }
        .comment-section h3,
        .rating-section h3 {
            font-size: 1.5rem;
            color: #1f3a2d;
            margin-bottom: 1rem;
            border-left: 4px solid #f59e0b;
            padding-left: 0.8rem;
        }
        .comment-form label,
        .rating-form label {
            display: block;
            font-weight: 600;
            margin-top: 1rem;
            margin-bottom: 0.3rem;
            color: #3d2e23;
        }
        .comment-form input,
        .comment-form textarea,
        .rating-form input,
        .rating-form select {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 2px solid #d6cdc2;
            border-radius: 12px;
            font-size: 1rem;
            background: #fff;
            transition: border 0.25s;
            outline: none;
        }
        .comment-form input:focus,
        .comment-form textarea:focus,
        .rating-form input:focus,
        .rating-form select:focus {
            border-color: #b45309;
        }
        .comment-form textarea {
            min-height: 100px;
            resize: vertical;
        }
        .btn-primary {
            background: #1f3a2d;
            color: #fff;
            border: none;
            padding: 0.7rem 2.2rem;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            margin-top: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn-primary:hover {
            background: #2a4a3a;
            transform: scale(1.02);
        }
        .btn-secondary {
            background: #b45309;
            color: #fff;
            border: none;
            padding: 0.7rem 2.2rem;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s, transform 0.15s;
            margin-top: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .btn-secondary:hover {
            background: #7a2e0e;
            transform: scale(1.02);
        }
        .rating-stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #d6cdc2;
            margin: 0.5rem 0 0.8rem;
            cursor: pointer;
        }
        .rating-stars i {
            transition: color 0.2s, transform 0.15s;
        }
        .rating-stars i:hover,
        .rating-stars i.active {
            color: #f59e0b;
            transform: scale(1.1);
        }
        .site-footer {
            background: #1f3a2d;
            color: #e5ddd4;
            padding: 2.5rem 0 1.5rem;
            margin-top: 3rem;
            border-top: 6px solid #f59e0b;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 700px) {
            .footer-inner {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        .footer-inner h4 {
            color: #fcd34d;
            margin-bottom: 0.8rem;
            font-size: 1.2rem;
        }
        .footer-inner a {
            color: #d4cdc0;
        }
        .footer-inner a:hover {
            color: #f59e0b;
        }
        .footer-links ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 0.4rem;
        }
        friend-link {
            display: block;
            padding: 0.6rem 0 0.2rem;
            font-style: normal;
        }
        friend-link a {
            display: inline-block;
            padding: 0.3rem 0.8rem;
            background: rgba(255, 255, 255, 0.07);
            border-radius: 30px;
            margin: 0.2rem 0.4rem 0.2rem 0;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        .copyright {
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
            padding-top: 1.5rem;
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #b5aa9c;
        }
        .copyright strong {
            color: #fcd34d;
        }
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #1f3a2d;
                padding: 1rem 0.5rem;
                border-radius: 0 0 16px 16px;
                margin-top: 0.5rem;
            }
            .nav-menu.open {
                display: flex;
            }
            .nav-menu a {
                padding: 0.7rem 1rem;
                width: 100%;
                text-align: left;
                border-radius: 8px;
            }
            .hamburger {
                display: block;
            }
            .article-body h1 {
                font-size: 2rem;
            }
            .article-body h2 {
                font-size: 1.6rem;
            }
            .article-body h3 {
                font-size: 1.3rem;
            }
            .sidebar {
                position: static;
            }
            .search-form input {
                min-width: 140px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.7rem;
            }
            .article-body h1 {
                font-size: 1.7rem;
            }
            .feedback-grid {
                gap: 1rem;
            }
            .comment-section,
            .rating-section {
                padding: 1.2rem;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #b45309;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
            transition: background 0.25s, transform 0.2s;
            z-index: 999;
            border: none;
            cursor: pointer;
        }
        .scroll-top:hover {
            background: #7a2e0e;
            transform: translateY(-4px);
        }
        @media (max-width: 480px) {
            .scroll-top {
                bottom: 1rem;
                right: 1rem;
                width: 40px;
                height: 40px;
                font-size: 1.2rem;
            }
        }