*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c3e50;
            --secondary: #e67e22;
            --secondary-light: #f39c12;
            --accent: #27ae60;
            --bg: #f5f2ed;
            --card-bg: #ffffff;
            --text: #2c3e50;
            --text-light: #7f8c8d;
            --border: #ddd;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
            --radius: 16px;
            --radius-sm: 8px;
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --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;
            padding-top: var(--header-height);
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--secondary-light);
        }
        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 {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: var(--primary);
            color: #fff;
            height: var(--header-height);
            display: flex;
            align-items: center;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
        }
        .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: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo span {
            color: var(--secondary);
        }
        .my-logo i {
            font-size: 1.4rem;
            color: var(--secondary);
        }
        .my-logo:hover {
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 4px;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 24px;
            list-style: none;
        }
        .main-nav a {
            color: rgba(255, 255, 255, 0.85);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.2s;
        }
        .main-nav a:hover {
            color: #fff;
            border-bottom-color: var(--secondary);
        }
        .main-nav .active {
            color: #fff;
            border-bottom-color: var(--secondary);
        }
        .breadcrumb {
            background: transparent;
            padding: 16px 0 8px;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .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);
            font-weight: 600;
        }
        .breadcrumb a {
            color: var(--secondary);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .current {
            color: var(--text-light);
        }
        .hero {
            padding: 40px 0 20px;
            text-align: center;
        }
        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .hero h1 span {
            color: var(--secondary);
        }
        .hero p {
            font-size: 1.15rem;
            max-width: 780px;
            margin: 0 auto 24px;
            color: var(--text-light);
        }
        .hero-meta {
            font-size: 0.9rem;
            color: var(--text-light);
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .hero-meta i {
            margin-right: 4px;
            color: var(--secondary);
        }
        .content-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 20px 0 60px;
        }
        .main-content {
            min-width: 0;
        }
        .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 h4 {
            font-size: 1.1rem;
            margin-bottom: 12px;
            color: var(--primary);
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 8px;
            display: inline-block;
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-card li {
            padding: 6px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-card li:last-child {
            border-bottom: none;
        }
        .sidebar-card a {
            font-size: 0.9rem;
        }
        .article-section {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px 36px;
            box-shadow: var(--shadow);
            margin-bottom: 32px;
        }
        .article-section h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--primary);
            margin: 32px 0 16px;
            padding-bottom: 8px;
            border-bottom: 3px solid var(--secondary);
            display: inline-block;
        }
        .article-section h2:first-child {
            margin-top: 0;
        }
        .article-section h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--primary-light);
            margin: 28px 0 12px;
        }
        .article-section h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--primary-light);
            margin: 20px 0 10px;
        }
        .article-section p {
            margin-bottom: 16px;
            font-size: 1rem;
            color: var(--text);
        }
        .article-section ul,
        .article-section ol {
            margin: 12px 0 20px 24px;
        }
        .article-section li {
            margin-bottom: 8px;
            font-size: 1rem;
        }
        .article-section .feature-img {
            margin: 24px 0;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow);
        }
        .highlight-box {
            background: #fef9f0;
            border-left: 4px solid var(--secondary);
            padding: 16px 20px;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 20px 0;
        }
        .highlight-box strong {
            color: var(--primary);
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 16px;
            margin: 20px 0;
        }
        .stat-card {
            background: var(--bg);
            padding: 20px 16px;
            border-radius: var(--radius-sm);
            text-align: center;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        }
        .stat-card .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--secondary);
            display: block;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 4px;
        }
        .search-form {
            display: flex;
            gap: 12px;
            margin: 20px 0;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 200px;
            padding: 12px 18px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: var(--secondary);
        }
        .search-form button {
            padding: 12px 28px;
            background: var(--secondary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-form button:hover {
            background: var(--secondary-light);
        }
        .search-form button:active {
            transform: scale(0.97);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 20px 0;
        }
        .feedback-card {
            background: var(--bg);
            padding: 24px;
            border-radius: var(--radius-sm);
        }
        .feedback-card h4 {
            margin-top: 0;
            margin-bottom: 16px;
            font-size: 1.1rem;
            color: var(--primary);
        }
        .feedback-card label {
            display: block;
            font-weight: 500;
            margin: 12px 0 4px;
            font-size: 0.95rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            width: 100%;
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-family: var(--font);
            outline: none;
            transition: border 0.2s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: var(--secondary);
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            margin-top: 12px;
            padding: 10px 24px;
            background: var(--accent);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .feedback-card .btn-submit:hover {
            background: #2ecc71;
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.6rem;
            color: #ddd;
            cursor: pointer;
            margin: 8px 0;
        }
        .star-rating i {
            transition: color 0.15s;
        }
        .star-rating i:hover,
        .star-rating i.hover {
            color: var(--secondary);
        }
        .star-rating i.selected {
            color: var(--secondary);
        }
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.8);
            padding: 40px 0 24px;
            margin-top: 40px;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-col h5 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 12px;
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 6px;
            display: inline-block;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
        }
        .footer-col li {
            padding: 4px 0;
        }
        .footer-col a {
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.9rem;
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        friend-link {
            display: block;
            margin-top: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
        }
        friend-link a {
            color: rgba(255, 255, 255, 0.7);
            margin: 0 4px;
        }
        friend-link a:hover {
            color: var(--secondary);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 18px;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }
        .copyright strong {
            color: rgba(255, 255, 255, 0.7);
        }
        @media(max-width:992px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .sidebar-card {
                margin-bottom: 0;
            }
        }
        @media(max-width:768px) {
            :root {
                --header-height: 64px;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .article-section {
                padding: 20px 18px;
            }
            .article-section h2 {
                font-size: 1.5rem;
            }
            .article-section h3 {
                font-size: 1.2rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--primary);
                flex-direction: column;
                padding: 20px 24px;
                gap: 12px;
                box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.3s ease;
                pointer-events: none;
                border-top: 1px solid rgba(255, 255, 255, 0.05);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .main-nav a {
                font-size: 1.05rem;
                padding: 8px 0;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media(max-width:480px) {
            .hero h1 {
                font-size: 1.6rem;
            }
            .stat-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .search-form input {
                min-width: 140px;
            }
        }
        .text-accent {
            color: var(--secondary);
        }
        .fw-700 {
            font-weight: 700;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .last-updated {
            font-size: 0.85rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 6px;
            margin-top: 8px;
        }
        .last-updated i {
            color: var(--secondary);
        }