*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #6c3fb5;
            --primary-dark: #4a2a7a;
            --primary-light: #9b6fe0;
            --accent: #ff6b35;
            --accent-light: #ff8c5a;
            --bg: #f8f6fc;
            --card-bg: #ffffff;
            --text: #1e1a2b;
            --text-light: #5a5470;
            --border: #e0dcec;
            --shadow: 0 8px 30px rgba(108, 63, 181, 0.10);
            --radius: 16px;
            --radius-sm: 8px;
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1140px;
            --header-height: 72px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            height: var(--header-height);
            display: flex;
            align-items: center;
            box-shadow: 0 2px 12px rgba(108, 63, 181, 0.06);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -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: var(--accent);
            font-size: 1.4rem;
        }
        .my-logo:hover {
            opacity: 0.85;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 28px;
            align-items: center;
        }
        .nav-list a {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-light);
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: 0.2s;
        }
        .nav-list a:hover {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: var(--bg);
        }
        .breadcrumb {
            background: var(--card-bg);
            padding: 12px 0;
            border-bottom: 1px solid var(--border);
            font-size: 0.85rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 8px;
            color: var(--text-light);
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }
        .main-content {
            padding: 40px 0 60px;
        }
        .article-header {
            margin-bottom: 40px;
            text-align: center;
        }
        .article-header h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 12px;
        }
        .article-header .meta {
            color: var(--text-light);
            font-size: 0.95rem;
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 20px;
        }
        .article-header .meta i {
            margin-right: 6px;
        }
        .featured-image {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 32px auto 40px;
            max-width: 820px;
            width: 100%;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
        }
        .article-body h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-top: 48px;
            margin-bottom: 16px;
            color: var(--primary-dark);
            border-left: 4px solid var(--accent);
            padding-left: 16px;
        }
        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin-top: 32px;
            margin-bottom: 12px;
            color: var(--primary);
        }
        .article-body h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-top: 24px;
            margin-bottom: 8px;
            color: var(--text);
        }
        .article-body p {
            margin-bottom: 18px;
            color: var(--text-light);
            font-size: 1.02rem;
        }
        .article-body strong {
            color: var(--text);
            font-weight: 600;
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0 24px 24px;
            color: var(--text-light);
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body .highlight-box {
            background: var(--card-bg);
            border-left: 4px solid var(--accent);
            padding: 20px 24px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-body .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .inline-link {
            font-weight: 500;
            color: var(--primary);
            border-bottom: 1px dotted var(--primary-light);
        }
        .inline-link:hover {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }
        .sidebar {
            position: sticky;
            top: calc(var(--header-height) + 24px);
            align-self: start;
        }
        .sidebar-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            margin-bottom: 24px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--primary-dark);
            border-bottom: 2px solid var(--border);
            padding-bottom: 8px;
        }
        .sidebar-card ul {
            list-style: none;
        }
        .sidebar-card li {
            padding: 8px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-card li:last-child {
            border-bottom: none;
        }
        .sidebar-card a {
            color: var(--text-light);
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card a:hover {
            color: var(--primary);
        }
        .sidebar-card a i {
            width: 20px;
            color: var(--accent);
        }
        .search-section {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px;
            box-shadow: var(--shadow);
            margin: 48px 0 32px;
        }
        .search-section h2 {
            font-size: 1.4rem;
            margin-bottom: 16px;
            color: var(--primary-dark);
        }
        .search-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 200px;
            padding: 14px 20px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            outline: none;
            transition: border 0.2s;
            background: var(--bg);
        }
        .search-form input:focus {
            border-color: var(--primary);
        }
        .search-form button {
            padding: 14px 32px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-form button:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            margin: 48px 0;
        }
        .feedback-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px;
            box-shadow: var(--shadow);
        }
        .feedback-card h2 {
            font-size: 1.3rem;
            color: var(--primary-dark);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-card label {
            display: block;
            font-weight: 500;
            margin-bottom: 6px;
            color: var(--text);
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-family: var(--font);
            outline: none;
            transition: border 0.2s;
            background: var(--bg);
            margin-bottom: 16px;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: var(--primary);
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-card button {
            padding: 12px 28px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card button:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
        }
        .star-rating {
            display: flex;
            gap: 6px;
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            margin-bottom: 16px;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            transition: color 0.2s;
            cursor: pointer;
            font-size: 2rem;
            color: #ddd;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f5b342;
        }
        .site-footer {
            background: var(--card-bg);
            border-top: 1px solid var(--border);
            padding: 40px 0 20px;
            margin-top: 60px;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        friend-link {
            display: block;
            margin-bottom: 24px;
        }
        friend-link h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        friend-link ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
        }
        friend-link a {
            color: var(--text-light);
            font-weight: 500;
            padding: 4px 0;
            border-bottom: 1px solid transparent;
            transition: 0.2s;
        }
        friend-link a:hover {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .copyright {
            text-align: center;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            color: var(--text-light);
            font-size: 0.9rem;
        }
        .copyright strong {
            color: var(--text);
        }
        @media (max-width: 900px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .article-header h1 {
                font-size: 2rem;
            }
        }
        @media (max-width: 768px) {
            .nav-list {
                display: none;
                flex-direction: column;
                background: var(--card-bg);
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                padding: 20px 24px;
                gap: 4px;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
                border-bottom: 1px solid var(--border);
            }
            .nav-list.open {
                display: flex;
            }
            .nav-list a {
                padding: 12px 0;
                font-size: 1.05rem;
                border-bottom: 1px solid var(--border);
            }
            .hamburger {
                display: block;
            }
            .article-header h1 {
                font-size: 1.7rem;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.15rem;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                justify-content: center;
            }
            .feedback-card {
                padding: 20px;
            }
        }
        @media (max-width: 480px) {
            .header-inner {
                padding: 0 12px;
            }
            .my-logo {
                font-size: 1.2rem;
            }
            .container {
                padding: 0 12px;
            }
            .article-header h1 {
                font-size: 1.4rem;
            }
            .breadcrumb ol {
                padding: 0 12px;
                font-size: 0.78rem;
            }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }
        .last-updated {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--bg);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
        }