* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #c62828;
            --primary-dark: #8e0000;
            --primary-light: #ff6659;
            --secondary: #1565c0;
            --secondary-dark: #003c8f;
            --accent: #f9a825;
            --bg: #f5f3f0;
            --surface: #ffffff;
            --text: #1a1a2e;
            --text-light: #5a5a7a;
            --border: #ddd8d0;
            --radius: 12px;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: var(--surface);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
            position: sticky;
            top: 0;
            z-index: 100;
            border-bottom: 3px solid var(--primary);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            flex-wrap: wrap;
            gap: 10px;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .my-logo i {
            -webkit-text-fill-color: var(--primary);
            font-size: 2rem;
        }
        .my-logo a {
            background: none;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }
        .my-logo a:hover {
            opacity: 0.85;
        }
        .my-logo .domain-badge {
            font-size: 0.5rem;
            -webkit-text-fill-color: var(--text-light);
            background: #f0eeeb;
            padding: 2px 10px;
            border-radius: 20px;
            letter-spacing: 0.3px;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        nav a {
            padding: 8px 16px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text);
            transition: var(--transition);
            white-space: nowrap;
        }
        nav a:hover,
        nav a.active {
            background: var(--primary);
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: var(--text);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .hamburger:hover {
            background: rgba(0, 0, 0, 0.05);
        }
        #nav-toggle {
            display: none;
        }
        .breadcrumb {
            background: var(--surface);
            padding: 10px 0;
            border-bottom: 1px solid var(--border);
            font-size: 0.85rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 12px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 600;
        }
        main {
            padding: 30px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.6rem;
            line-height: 1.2;
            margin-bottom: 12px;
            color: var(--primary-dark);
            border-left: 6px solid var(--primary);
            padding-left: 20px;
        }
        .article-body .subtitle {
            font-size: 1.1rem;
            color: var(--text-light);
            margin-bottom: 24px;
            font-weight: 400;
        }
        .article-body .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 16px 30px;
            margin-bottom: 28px;
            font-size: 0.9rem;
            color: var(--text-light);
            border-bottom: 1px solid var(--border);
            padding-bottom: 16px;
        }
        .article-body .meta i {
            margin-right: 6px;
            color: var(--primary);
        }
        .article-body h2 {
            font-size: 1.9rem;
            margin-top: 48px;
            margin-bottom: 16px;
            color: var(--primary-dark);
            border-bottom: 2px solid var(--border);
            padding-bottom: 8px;
        }
        .article-body h3 {
            font-size: 1.4rem;
            margin-top: 32px;
            margin-bottom: 12px;
            color: var(--secondary-dark);
        }
        .article-body h4 {
            font-size: 1.15rem;
            margin-top: 24px;
            margin-bottom: 8px;
            color: var(--text);
            font-weight: 600;
        }
        .article-body p {
            margin-bottom: 18px;
            font-size: 1.05rem;
        }
        .article-body ul,
        .article-body ol {
            margin: 12px 0 22px 24px;
        }
        .article-body li {
            margin-bottom: 8px;
            font-size: 1.02rem;
        }
        .article-body .highlight-box {
            background: var(--surface);
            border-left: 5px solid var(--accent);
            padding: 20px 24px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-body .highlight-box strong {
            color: var(--primary-dark);
        }
        .article-body .stat-badge {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 2px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.4px;
        }
        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
            margin: 24px 0;
            box-shadow: var(--shadow);
            display: block;
        }
        .article-body .img-caption {
            font-size: 0.85rem;
            color: var(--text-light);
            text-align: center;
            margin-top: -16px;
            margin-bottom: 24px;
        }
        .sidebar {
            position: sticky;
            top: 130px;
            align-self: start;
        }
        .sidebar-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 20px;
            margin-bottom: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-bottom: 14px;
            color: var(--primary-dark);
            border-bottom: 1px solid var(--border);
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card ul li {
            padding: 6px 0;
            border-bottom: 1px dashed #f0eeeb;
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.92rem;
        }
        .sidebar-card ul li a i {
            color: var(--primary);
            font-size: 0.75rem;
        }
        .search-form {
            display: flex;
            gap: 8px;
            margin-bottom: 6px;
        }
        .search-form input {
            flex: 1;
            padding: 10px 16px;
            border: 2px solid var(--border);
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
            background: var(--bg);
        }
        .search-form input:focus {
            border-color: var(--primary);
            background: var(--surface);
        }
        .search-form button {
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 30px;
            padding: 10px 20px;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .search-form button:hover {
            background: var(--primary-dark);
        }
        .feedback-section {
            margin-top: 50px;
            padding-top: 30px;
            border-top: 2px solid var(--border);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 20px;
        }
        @media (max-width: 700px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .feedback-card h3 {
            font-size: 1.2rem;
            margin-bottom: 16px;
            color: var(--primary-dark);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .feedback-card form input,
        .feedback-card form textarea,
        .feedback-card form select {
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
            background: var(--bg);
            font-family: inherit;
        }
        .feedback-card form input:focus,
        .feedback-card form textarea:focus,
        .feedback-card form select:focus {
            border-color: var(--primary);
            background: var(--surface);
        }
        .feedback-card form textarea {
            resize: vertical;
            min-height: 100px;
        }
        .feedback-card form button {
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 30px;
            padding: 12px 24px;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
            align-self: flex-start;
        }
        .feedback-card form button:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: var(--accent);
        }
        footer {
            background: var(--text);
            color: #e0e0e0;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        footer .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }
        @media (max-width: 768px) {
            footer .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        footer h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 14px;
            border-bottom: 2px solid var(--primary);
            padding-bottom: 6px;
            display: inline-block;
        }
        footer a {
            color: #b0b0d0;
        }
        footer a:hover {
            color: var(--accent);
        }
        footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        footer ul li {
            padding: 4px 0;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius);
            padding: 16px 20px;
            margin: 12px 0 20px;
            border-left: 4px solid var(--primary);
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            padding: 4px 12px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 20px;
            font-size: 0.9rem;
        }
        friend-link a:hover {
            background: var(--primary);
            color: #fff;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.85rem;
            color: #999;
        }
        .copyright strong {
            color: #ccc;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: var(--surface);
                padding: 12px 0 16px;
                border-top: 1px solid var(--border);
                gap: 2px;
            }
            #nav-toggle:checked~nav {
                display: flex;
            }
            nav a {
                padding: 10px 20px;
                border-radius: 0;
                width: 100%;
                border-bottom: 1px solid #f5f3f0;
            }
            .article-body h1 {
                font-size: 1.9rem;
                padding-left: 14px;
            }
            .article-body h2 {
                font-size: 1.5rem;
            }
            .article-body h3 {
                font-size: 1.2rem;
            }
            .header-inner {
                padding: 10px 0;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .my-logo .domain-badge {
                font-size: 0.4rem;
                padding: 1px 8px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 12px;
            }
            .article-body h1 {
                font-size: 1.6rem;
            }
            .feedback-card {
                padding: 16px;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
                justify-content: center;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--primary);
            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 16px rgba(0, 0, 0, 0.2);
            cursor: pointer;
            transition: var(--transition);
            border: none;
            z-index: 50;
            opacity: 0.85;
        }
        .scroll-top:hover {
            opacity: 1;
            transform: translateY(-4px);
            background: var(--primary-dark);
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.95rem;
        }
        .article-body th,
        .article-body td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            text-align: left;
        }
        .article-body th {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }
        .article-body tr:nth-child(even) {
            background: #faf8f6;
        }
        .article-body tr:hover {
            background: #f0eeeb;
        }