:root {
            --primary: #1a3a5c;
            --primary-light: #2d5a8e;
            --secondary: #3db4a8;
            --secondary-dark: #2a8d82;
            --accent: #f39c12;
            --dark: #0f2027;
            --light: #f0f4f8;
            --white: #ffffff;
            --grey: #6c7a89;
            --border: #e1e8ed;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --radius: 12px;
            --transition: all 0.3s ease;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            line-height: 1.75;
            color: #333;
            background: var(--light);
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .site-header {
            background: var(--white);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            min-height: 72px;
        }
        .my-logo {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .my-logo .logo-icon {
            color: var(--secondary);
            font-size: 2rem;
        }
        .my-logo:hover {
            color: var(--secondary);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--primary);
            cursor: pointer;
            padding: 8px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }
        .main-nav a {
            padding: 8px 14px;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--primary);
            transition: var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: var(--primary);
            color: var(--white);
        }
        .nav-search {
            display: flex;
            align-items: center;
            background: var(--light);
            border-radius: 30px;
            padding: 4px 12px;
            min-width: 200px;
        }
        .nav-search input {
            border: none;
            background: transparent;
            padding: 6px 8px;
            font-size: 0.85rem;
            outline: none;
            width: 100%;
        }
        .nav-search button {
            background: none;
            border: none;
            color: var(--primary);
            cursor: pointer;
            font-size: 0.95rem;
        }
        .breadcrumb-wrapper {
            background: var(--white);
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
        }
        .breadcrumb {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--grey);
        }
        .breadcrumb a {
            color: var(--primary);
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: var(--grey);
        }
        .hero {
            background: linear-gradient(135deg, var(--primary) 0%, var(--dark) 60%, var(--primary-light) 100%);
            color: var(--white);
            padding: 60px 24px;
            position: relative;
            overflow: hidden;
        }
        .hero::after {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(61, 180, 168, 0.3) 0%, transparent 70%);
            border-radius: 50%;
        }
        .hero-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-tag {
            display: inline-block;
            background: rgba(61, 180, 168, 0.2);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--secondary);
            margin-bottom: 16px;
        }
        .hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -1px;
        }
        .hero p {
            font-size: 1.1rem;
            opacity: 0.9;
            max-width: 600px;
            margin-bottom: 24px;
        }
        .hero-stats {
            display: flex;
            gap: 30px;
            margin-top: 24px;
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--secondary);
        }
        .hero-stat .stat-label {
            font-size: 0.85rem;
            opacity: 0.8;
        }
        .hero-image {
            position: relative;
            z-index: 2;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }
        .hero-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 300px;
        }
        .hero-image .img-caption {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
            padding: 30px 16px 12px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.9);
        }
        .content-wrapper {
            max-width: 1200px;
            margin: 0 auto;
            padding: 40px 24px;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-main {
            background: var(--white);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .sidebar-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            color: var(--primary);
            margin-bottom: 12px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--secondary);
        }
        .sidebar-card ul {
            list-style: none;
        }
        .sidebar-card li {
            margin-bottom: 8px;
        }
        .sidebar-card li a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--primary);
            padding: 6px 8px;
            border-radius: 6px;
            transition: var(--transition);
        }
        .sidebar-card li a:hover {
            background: var(--light);
            color: var(--secondary);
        }
        .sidebar-card li a i {
            font-size: 0.8rem;
            color: var(--secondary);
            width: 20px;
            text-align: center;
        }
        .sidebar-card .side-link-list a {
            color: var(--primary);
        }
        .article-main h2 {
            font-size: 1.8rem;
            color: var(--primary);
            margin: 40px 0 16px;
            padding-bottom: 8px;
            border-bottom: 3px solid var(--secondary);
        }
        .article-main h2:first-of-type {
            margin-top: 0;
        }
        .article-main h3 {
            font-size: 1.4rem;
            color: var(--primary);
            margin: 28px 0 12px;
        }
        .article-main h4 {
            font-size: 1.1rem;
            color: var(--dark);
            margin: 20px 0 8px;
        }
        .article-main p {
            margin-bottom: 16px;
            font-size: 1rem;
            color: #444;
        }
        .article-main ul {
            margin: 16px 0;
            padding-left: 20px;
        }
        .article-main ul li {
            margin-bottom: 8px;
            font-size: 1rem;
        }
        .article-main blockquote {
            background: var(--light);
            border-left: 4px solid var(--secondary);
            padding: 16px 20px;
            margin: 20px 0;
            border-radius: 0 8px 8px 0;
            font-style: italic;
            color: var(--dark);
        }
        .article-main blockquote cite {
            display: block;
            margin-top: 8px;
            font-size: 0.9rem;
            color: var(--grey);
            font-style: normal;
        }
        .highlight-box {
            background: linear-gradient(135deg, rgba(61, 180, 168, 0.08), rgba(243, 156, 18, 0.05));
            border: 1px solid rgba(61, 180, 168, 0.3);
            border-radius: var(--radius);
            padding: 20px 24px;
            margin: 20px 0;
        }
        .highlight-box h4 {
            color: var(--primary);
            margin-top: 0;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.95rem;
        }
        .data-table th {
            background: var(--primary);
            color: var(--white);
            padding: 12px 16px;
            text-align: left;
        }
        .data-table td {
            padding: 12px 16px;
            border-bottom: 1px solid var(--border);
        }
        .data-table tr:nth-child(even) {
            background: var(--light);
        }
        .data-table tr:hover {
            background: rgba(61, 180, 168, 0.05);
        }
        .tip-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin: 24px 0;
        }
        .tip-card {
            background: var(--light);
            border-radius: 10px;
            padding: 20px;
            text-align: center;
            transition: var(--transition);
        }
        .tip-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .tip-card i {
            font-size: 2rem;
            color: var(--secondary);
            margin-bottom: 12px;
        }
        .tip-card h4 {
            margin-bottom: 8px;
        }
        .tip-card p {
            font-size: 0.9rem;
            margin: 0;
        }
        .form-section {
            background: var(--light);
            border-radius: var(--radius);
            padding: 24px;
            margin: 24px 0;
        }
        .form-section h3 {
            color: var(--primary);
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 4px;
            font-size: 0.9rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            transition: var(--transition);
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: var(--secondary);
            box-shadow: 0 0 0 3px rgba(61, 180, 168, 0.2);
        }
        .btn-submit {
            background: var(--primary);
            color: var(--white);
            border: none;
            padding: 10px 24px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }
        .btn-submit:hover {
            background: var(--secondary);
            transform: translateY(-2px);
        }
        .rating-stars {
            display: flex;
            gap: 4px;
            flex-direction: row-reverse;
            justify-content: flex-start;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            font-size: 1.8rem;
            color: var(--grey);
            cursor: pointer;
            transition: var(--transition);
        }
        .rating-stars input:checked~label,
        .rating-stars label:hover,
        .rating-stars label:hover~label {
            color: var(--accent);
            transform: scale(1.1);
        }
        .rating-text {
            font-size: 0.85rem;
            color: var(--grey);
            margin-left: 8px;
        }
        .update-date {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--grey);
            font-size: 0.85rem;
            margin-top: 16px;
            padding: 12px;
            background: var(--light);
            border-radius: 8px;
        }
        .update-date i {
            color: var(--secondary);
        }
        .site-footer {
            background: var(--dark);
            color: #ccc;
            padding: 40px 24px 20px;
            margin-top: 40px;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-col h4 {
            color: var(--white);
            margin-bottom: 12px;
            font-size: 1rem;
            border-bottom: 2px solid var(--secondary);
            padding-bottom: 6px;
            display: inline-block;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 6px;
        }
        .footer-col a {
            color: #aaa;
            font-size: 0.9rem;
        }
        .footer-col a:hover {
            color: var(--secondary);
        }
        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 20px;
            text-align: center;
            font-size: 0.85rem;
            color: #888;
        }
        friend-link {
            display: block;
            margin-top: 16px;
            font-size: 0.9rem;
            color: #aaa;
        }
        friend-link a {
            color: var(--secondary);
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        @media (max-width: 1024px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
            .hero-container {
                grid-template-columns: 1fr;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .header-container {
                flex-wrap: wrap;
                padding: 0 16px;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 12px 0;
                border-top: 1px solid var(--border);
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                padding: 10px 14px;
            }
            .nav-search {
                width: 100%;
                margin: 8px 0;
            }
            .nav-search input {
                width: 100%;
            }
            .breadcrumb {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .hero {
                padding: 40px 16px;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 16px;
            }
            .hero-stat .stat-num {
                font-size: 1.5rem;
            }
            .article-main {
                padding: 24px 16px;
                border-radius: 8px;
            }
            .content-wrapper {
                padding: 24px 16px;
            }
            .data-table {
                font-size: 0.85rem;
            }
            .data-table th,
            .data-table td {
                padding: 8px;
            }
            .article-main h2 {
                font-size: 1.5rem;
            }
            .article-main h3 {
                font-size: 1.2rem;
            }
            .tip-section {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 480px) {
            .tip-section {
                grid-template-columns: 1fr;
            }
            .hero-stats {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        @media print {
            .site-header,
            .site-footer,
            .sidebar,
            .form-section,
            .breadcrumb-wrapper {
                display: none !important;
            }
            .content-wrapper {
                display: block;
            }
            body {
                background: white;
            }
        }