*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #1a73e8;
            --primary-dark: #0d5bb8;
            --accent: #ff6b35;
            --accent-light: #ff8c5a;
            --bg: #f0f4f8;
            --card-bg: #ffffff;
            --text: #2c3e50;
            --text-light: #5a6c7d;
            --border: #e1e8ef;
            --radius: 12px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
            --font-main: 'Segoe UI', 'Roboto', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-main);
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            font-size: 16px;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 10px;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, var(--primary) 0%, #0d3a74 100%);
            padding: 18px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo i {
            font-size: 2rem;
            color: var(--accent);
        }
        .my-logo:hover {
            color: #fff;
            text-decoration: none;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 4px;
            flex-wrap: wrap;
        }
        .nav-list li a {
            color: rgba(255, 255, 255, 0.9);
            padding: 8px 16px;
            border-radius: 24px;
            font-weight: 500;
            font-size: 0.92rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: background 0.3s, color 0.3s;
        }
        .nav-list li a:hover,
        .nav-list li a.active {
            background: rgba(255, 255, 255, 0.15);
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.7);
            border-radius: 8px;
            padding: 8px 10px;
            cursor: pointer;
        }
        .hamburger span {
            display: block;
            width: 22px;
            height: 2px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s;
        }
        .breadcrumb-wrap {
            background: #fff;
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 4px;
        }
        .breadcrumb li:not(:last-child)::after {
            content: '›';
            margin: 0 4px;
            color: #999;
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .hero {
            background: linear-gradient(135deg, #e8f0fe 0%, #f5f9ff 50%, #fff3ed 100%);
            padding: 60px 20px 40px;
            text-align: center;
            border-bottom: 1px solid var(--border);
        }
        .hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text);
            line-height: 1.3;
            max-width: 900px;
            margin: 0 auto 12px;
        }
        .hero h1 .highlight {
            color: var(--accent);
        }
        .hero p {
            color: var(--text-light);
            font-size: 1.1rem;
            max-width: 800px;
            margin: 0 auto 20px;
        }
        .hero-meta {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 16px;
            color: var(--text-light);
            font-size: 0.9rem;
            margin-top: 12px;
        }
        .hero-meta i {
            color: var(--accent);
            margin-right: 4px;
        }
        .main-wrapper {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
            padding: 40px 0;
        }
        .main-content {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .widget {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            border-top: 4px solid var(--primary);
        }
        .widget h3 {
            font-size: 1.15rem;
            margin-bottom: 12px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .widget ul {
            list-style: none;
        }
        .widget ul li {
            margin-bottom: 8px;
        }
        .widget ul li a {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.93rem;
            padding: 6px 8px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .widget ul li a:hover {
            background: var(--bg);
            text-decoration: none;
        }
        .widget ul li a i {
            color: var(--accent);
            font-size: 0.85rem;
            width: 20px;
            text-align: center;
        }
        .search-box {
            display: flex;
            gap: 8px;
        }
        .search-box input {
            flex: 1;
            padding: 12px 16px;
            border: 2px solid var(--border);
            border-radius: 24px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-box input:focus {
            border-color: var(--primary);
        }
        .search-box button {
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 50%;
            width: 44px;
            height: 44px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.3s;
        }
        .search-box button:hover {
            background: var(--primary-dark);
        }
        .section {
            margin-bottom: 40px;
        }
        .section h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--text);
            border-bottom: 3px solid var(--primary);
            padding-bottom: 10px;
            margin-bottom: 20px;
            display: inline-block;
        }
        .section h3 {
            font-size: 1.45rem;
            font-weight: 600;
            color: var(--text);
            margin-top: 30px;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--primary);
            margin-top: 20px;
            margin-bottom: 10px;
        }
        .section p {
            margin-bottom: 16px;
            color: var(--text-light);
            line-height: 1.8;
        }
        .section strong {
            color: var(--text);
        }
        .section .highlight-text {
            background: linear-gradient(135deg, #f0f6ff, #fff3ed);
            border-left: 4px solid var(--accent);
            padding: 16px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
        }
        .section ul,
        .section ol {
            margin-left: 24px;
            margin-bottom: 16px;
            color: var(--text-light);
        }
        .section li {
            margin-bottom: 6px;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.95rem;
            overflow-x: auto;
            display: block;
        }
        .compare-table th,
        .compare-table td {
            padding: 12px 16px;
            border: 1px solid var(--border);
            text-align: left;
        }
        .compare-table th {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
        }
        .compare-table tr:nth-child(even) {
            background: var(--bg);
        }
        .compare-table tr:hover {
            background: #eef4ff;
        }
        .content-image {
            margin: 24px 0;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
        }
        .content-image figcaption {
            padding: 10px 16px;
            background: #f8f9fb;
            font-size: 0.85rem;
            color: var(--text-light);
            text-align: center;
            border-top: 1px solid var(--border);
        }
        .user-form {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 24px;
            margin-top: 20px;
            border: 1px solid var(--border);
        }
        .user-form label {
            font-weight: 600;
            margin-bottom: 8px;
            display: block;
            color: var(--text);
        }
        .user-form textarea,
        .user-form input,
        .user-form select {
            width: 100%;
            padding: 12px;
            border: 2px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            margin-bottom: 16px;
            font-family: inherit;
            transition: border-color 0.3s;
            background: #fff;
        }
        .user-form textarea:focus,
        .user-form input:focus {
            border-color: var(--primary);
            outline: none;
        }
        .user-form button {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 14px 28px;
            border-radius: 24px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s, transform 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .user-form button:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.6rem;
            margin-bottom: 12px;
            cursor: pointer;
        }
        .star-rating i {
            color: #ddd;
            transition: color 0.2s, transform 0.2s;
        }
        .star-rating i.active,
        .star-rating i:hover {
            color: #f5b942;
            transform: scale(1.1);
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: 10px;
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-item summary {
            padding: 16px 20px;
            font-weight: 600;
            cursor: pointer;
            background: #f8f9fb;
            transition: background 0.3s;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary:hover {
            background: #eef1f5;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.8rem;
            color: var(--accent);
            transition: transform 0.3s;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item p {
            padding: 16px 20px;
            margin: 0;
            background: #fff;
            border-top: 1px solid var(--border);
        }
        .site-footer {
            background: #1a1f36;
            color: #a0a9bd;
            padding: 40px 0 20px;
            margin-top: 60px;
            font-size: 0.9rem;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-inner h4 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 12px;
        }
        .footer-inner a {
            color: #a0a9bd;
        }
        .footer-inner a:hover {
            color: #fff;
        }
        .site-footer .copyright {
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            font-size: 0.85rem;
            color: #6e7b91;
        }
        .site-footer .copyright a {
            color: #8fa3c0;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 6px;
            padding: 8px 12px;
            margin-bottom: 6px;
            font-size: 0.85rem;
        }
        friend-link a {
            color: #a0a9bd;
            text-decoration: none;
        }
        friend-link a:hover {
            color: #fff;
        }
        @media (max-width: 992px) {
            .main-wrapper {
                grid-template-columns: 1fr;
                padding: 20px 0;
            }
            .sidebar {
                order: 2;
                flex-direction: row;
                flex-wrap: wrap;
                gap: 16px;
            }
            .widget {
                flex: 1 1 calc(50% - 8px);
                min-width: 200px;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .nav-list {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(0, 0, 0, 0.2);
                border-radius: 10px;
                padding: 12px;
                margin-top: 10px;
            }
            .nav-list.show {
                display: flex;
            }
            .nav-list li a {
                justify-content: flex-start;
                padding: 10px 16px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .main-content {
                padding: 24px 18px;
            }
            .section h2 {
                font-size: 1.5rem;
            }
            .blog-author {
                flex-wrap: wrap;
            }
            .compare-table {
                font-size: 0.82rem;
            }
        }
        @media (max-width: 480px) {
            .hero {
                padding: 40px 16px 30px;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .main-wrapper {
                padding: 10px 0;
            }
            .widget {
                flex-basis: 100%;
            }
        }
        .text-center {
            text-align: center;
        }
        .mt-0 {
            margin-top: 0;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .last-updated {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #e8f0fe;
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
        }
        blockquote {
            border-left: 4px solid var(--primary);
            background: var(--bg);
            padding: 16px 20px;
            border-radius: 0 8px 8px 0;
            margin: 20px 0;
            color: var(--text-light);
            font-style: italic;
        }
        blockquote strong {
            color: var(--text);
        }