* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1e3c72;
            --primary-light: #2a5298;
            --secondary: #f39c12;
            --accent: #e74c3c;
            --bg: #f4f7fc;
            --card-bg: #ffffff;
            --text: #222;
            --text-light: #555;
            --border: #dce1e8;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --radius: 12px;
            --max-width: 1200px;
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            padding: 0 0 12px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 12px 0 6px 0;
        }
        .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 i {
            color: var(--secondary);
            font-size: 2rem;
        }
        .my-logo span.sub {
            font-size: 0.65rem;
            font-weight: 400;
            opacity: 0.7;
            display: block;
            line-height: 1.2;
        }
        .my-logo:hover {
            color: #fff;
            text-decoration: none;
        }
        nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }
        nav a {
            color: rgba(255, 255, 255, 0.85);
            padding: 6px 14px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.2s;
            white-space: nowrap;
        }
        nav a:hover,
        nav a.active {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.12);
        }
        .breadcrumb {
            background: rgba(255, 255, 255, 0.08);
            padding: 6px 16px;
            border-radius: 30px;
            display: inline-flex;
            flex-wrap: wrap;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 4px;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
        }
        .breadcrumb a:hover {
            color: #fff;
            text-decoration: none;
        }
        .breadcrumb span {
            margin: 0 6px;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            margin: 40px 0;
        }
        @media(max-width:992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-content {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px 36px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            position: sticky;
            top: 120px;
            align-self: start;
        }
        .sidebar-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px 22px;
            box-shadow: var(--shadow);
            margin-bottom: 24px;
        }
        .sidebar-card h4 {
            font-size: 1rem;
            margin-bottom: 12px;
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 6px;
            color: var(--primary);
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
        }
        .sidebar-card li {
            margin-bottom: 8px;
            font-size: 0.9rem;
        }
        .sidebar-card li a {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card li a i {
            width: 18px;
            color: var(--secondary);
            font-size: 0.8rem;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            margin: 0 0 12px 0;
            line-height: 1.25;
            letter-spacing: -0.5px;
        }
        h1 i {
            color: var(--secondary);
        }
        h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary);
            margin: 36px 0 14px 0;
            padding-bottom: 6px;
            border-bottom: 3px solid var(--secondary);
            display: inline-block;
        }
        h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--primary-light);
            margin: 28px 0 10px 0;
        }
        h4 {
            font-size: 1.05rem;
            font-weight: 600;
            color: #2c3e50;
            margin: 20px 0 8px 0;
        }
        p {
            margin-bottom: 16px;
        }
        .lead {
            font-size: 1.15rem;
            font-weight: 400;
            color: var(--text-light);
            border-left: 4px solid var(--secondary);
            padding-left: 20px;
            margin: 20px 0 24px 0;
        }
        .highlight {
            background: #fff8e1;
            padding: 2px 6px;
            border-radius: 4px;
            font-weight: 600;
        }
        .stat-box {
            background: #f0f4fe;
            border-radius: var(--radius);
            padding: 18px 22px;
            margin: 18px 0;
            border-left: 4px solid var(--primary);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 6px 20px;
        }
        .stat-box span {
            font-weight: 600;
            color: var(--primary);
        }
        .quote {
            font-style: italic;
            background: #f9f9f9;
            padding: 18px 24px;
            border-radius: var(--radius);
            border-left: 4px solid var(--accent);
            margin: 20px 0;
            color: #444;
        }
        .quote cite {
            display: block;
            margin-top: 8px;
            font-style: normal;
            font-weight: 600;
            color: var(--primary);
        }
        .img-wrapper {
            border-radius: var(--radius);
            overflow: hidden;
            margin: 24px 0;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
            background: #f0f2f5;
            text-align: center;
        }
        .img-wrapper img {
            width: 100%;
            max-height: 420px;
            object-fit: cover;
        }
        .img-wrapper figcaption {
            padding: 8px 14px;
            font-size: 0.85rem;
            color: var(--text-light);
            background: #fafafa;
        }
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin: 20px 0;
        }
        @media(max-width:600px) {
            .feature-grid {
                grid-template-columns: 1fr;
            }
        }
        .feature-item {
            background: #f8faff;
            padding: 16px 18px;
            border-radius: 10px;
            border: 1px solid var(--border);
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .feature-item:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
        }
        .feature-item i {
            color: var(--secondary);
            font-size: 1.2rem;
            margin-right: 8px;
        }
        .styled-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.92rem;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
        }
        .styled-table th {
            background: var(--primary);
            color: #fff;
            padding: 12px 16px;
            text-align: left;
            font-weight: 600;
        }
        .styled-table td {
            padding: 10px 16px;
            border-bottom: 1px solid var(--border);
        }
        .styled-table tr:nth-child(even) {
            background: #f8faff;
        }
        .styled-table tr:hover {
            background: #eef3fc;
        }
        .form-card {
            background: #f9fbfe;
            border-radius: var(--radius);
            padding: 24px 28px;
            margin: 28px 0;
            border: 1px solid var(--border);
        }
        .form-card h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 4px;
            font-size: 0.95rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-family: var(--font);
            font-size: 0.95rem;
            transition: border 0.2s;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: var(--primary-light);
            outline: none;
            box-shadow: 0 0 0 3px rgba(42, 82, 152, 0.12);
        }
        .btn {
            display: inline-block;
            padding: 10px 28px;
            border: none;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: all 0.25s;
            font-family: var(--font);
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(30, 60, 114, 0.25);
        }
        .btn-secondary {
            background: var(--secondary);
            color: #fff;
        }
        .btn-secondary:hover {
            background: #e67e22;
            transform: translateY(-1px);
        }
        .star-rating {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #ccc;
            cursor: pointer;
            margin: 6px 0 12px 0;
        }
        .star-rating i.active {
            color: var(--secondary);
        }
        .star-rating i:hover {
            color: #f1c40f;
        }
        footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.85);
            padding: 40px 0 24px 0;
            margin-top: 48px;
        }
        footer a {
            color: rgba(255, 255, 255, 0.8);
        }
        footer a:hover {
            color: var(--secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }
        @media(max-width:768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .footer-brand p {
            font-size: 0.9rem;
            margin-top: 6px;
        }
        friend-link {
            display: block;
            margin-top: 4px;
            font-size: 0.9rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 18px;
            margin-bottom: 4px;
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 20px;
            font-size: 0.85rem;
            text-align: center;
            color: rgba(255, 255, 255, 0.6);
        }
        @media(max-width:768px) {
            .header-inner {
                padding: 8px 0 4px 0;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .my-logo span.sub {
                font-size: 0.55rem;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: rgba(0, 0, 0, 0.25);
                padding: 12px 8px;
                border-radius: 12px;
                margin-top: 8px;
            }
            nav.open {
                display: flex;
            }
            nav a {
                padding: 8px 12px;
                font-size: 0.95rem;
            }
            .hamburger {
                display: block;
            }
            .breadcrumb {
                font-size: 0.7rem;
                padding: 4px 12px;
            }
            .article-content {
                padding: 20px 16px;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.1rem;
            }
            .stat-box {
                grid-template-columns: 1fr;
            }
            .main-grid {
                margin: 20px 0;
                gap: 24px;
            }
            .sidebar {
                position: static;
            }
        }
        @media(max-width:480px) {
            .container {
                padding: 0 12px;
            }
            .article-content {
                padding: 14px 12px;
            }
            h1 {
                font-size: 1.5rem;
            }
            .lead {
                font-size: 1rem;
                padding-left: 14px;
            }
            .form-card {
                padding: 16px 14px;
            }
        }
        .back-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);
            transition: all 0.3s;
            opacity: 0;
            pointer-events: none;
            z-index: 99;
        }
        .back-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .back-top:hover {
            background: var(--primary-light);
            transform: translateY(-3px);
        }