:root {
            --primary: #165DFF; /* 更具质感的主色 */
            --primary-light: #4080FF;
            --primary-dark: #0E42D2;
            --secondary: #0FC6C2;
            --neutral-100: #F5F7FA;
            --neutral-200: #E4E7ED;
            --neutral-300: #C9CDD4;
            --neutral-800: #1D2129;
            --neutral-900: #0F1419;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 16px rgba(0,0,0,0.09);
            --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
            --radius-sm: 6px;
            --radius: 12px;
            --radius-lg: 16px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        /* 基础样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            line-height: 1.5;
            background-color: var(--neutral-100);
            color: var(--neutral-800);
            overflow-x: hidden;
        }
        
        .container {
            width: 100%;
            max-width: 1440px; /* 超宽容器，保持大气感 */
            margin: 0 auto;
            padding: 0 30px;
        }
        
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            background-color: var(--primary);
            color: white;
            border-radius: 30px;
            font-weight: 500;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            font-size: 16px;
        }
        
        .btn:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(22, 93, 255, 0.2);
        }
        
        .btn-outline {
            background-color: transparent;
            border: 1px solid var(--primary);
            color: var(--primary);
        }
        
        .btn-outline:hover {
            background-color: var(--primary);
            color: white;
        }
        
        /* 头部样式 */
        .header {
            background-color: white;
            box-shadow: var(--shadow-sm);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 999;
            transition: var(--transition);
        }
        
        .header.scroll {
            padding: 15px 0;
            box-shadow: var(--shadow);
        }
        
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .logo img {
            max-height: 70px; /* 加大Logo，增强视觉焦点 */
        }
        
        .logo-text {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
        }
        
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 28px;
            cursor: pointer;
            color: var(--neutral-800);
            z-index: 1000;
        }
        
        .nav ul {
            display: flex;
            list-style: none;
            align-items: center;
        }
        
        .nav li {
            margin-left: 45px; /* 加大导航间距，更显大气 */
            position: relative;
        }
        
        .nav a {
            text-decoration: none;
            color: var(--neutral-800);
            font-weight: 500;
            transition: var(--transition);
            display: block;
            padding: 10px 0;
            font-size: 17px;
            position: relative;
        }
        
        .nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: var(--transition);
        }
        
        .nav a:hover {
            color: var(--primary);
        }
        
        .nav a:hover::after {
            width: 100%;
        }

        /* 下拉菜单核心样式 */
        .dropdown {
            position: relative;
        }
        
        .dropdown-toggle {
            display: flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
        }
        
        .dropdown-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%) translateY(10px);
            min-width: 240px;
            background: white;
            box-shadow: var(--shadow);
            border-radius: var(--radius);
            padding: 15px 0;
            margin-top: 5px;
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        
        .dropdown.active .dropdown-menu {
            display: block;
            opacity: 1;
            visibility: visible;
            transform: translateX(-50%) translateY(0);
        }
        
        .dropdown-menu li {
            margin: 0;
            padding: 0 20px;
        }
        
        .dropdown-menu a {
            padding: 12px 20px;
            color: var(--neutral-800);
            transition: var(--transition);
            font-size: 16px;
        }
        
        .dropdown-menu a:hover {
            background-color: rgba(22, 93, 255, 0.05);
            color: var(--primary);
            padding-left: 25px;
        }
        
        .dropdown-menu a::after {
            display: none;
        }
        
        /* 箭头旋转动画 */
        .dropdown-arrow {
            display: inline-block;
            transition: transform 0.3s ease;
            font-size: 14px;
        }
        
        .dropdown.active .dropdown-arrow {
            transform: rotate(180deg);
        }
        
        /* 横幅样式 - 增强大气感 */
        .banner {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--secondary) 100%);
            color: white;
            padding: 140px 0;
            text-align: center;
            margin: 30px 0 80px;
            border-radius: var(--radius-lg);
            position: relative;
            overflow: hidden;
        }
        
        .banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M11 c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z' fill='%23ffffff' fill-opacity='0.1' fill-rule='evenodd'/%3E%3C/svg%3E");
            opacity: 0.3;
            z-index: 1;
        }
        
        .banner-content {
            position: relative;
            z-index: 2;
            max-width: 900px;
            margin: 0 auto;
        }
        
        .banner h2 {
            font-size: 4rem; /* 超大标题，强化视觉冲击 */
            margin-bottom: 25px;
            font-weight: 700;
            line-height: 1.2;
            text-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        .banner p {
            font-size: 1.5rem;
            margin-bottom: 40px;
            opacity: 0.9;
            line-height: 1.6;
        }
        
        .banner-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
        }
        
        /* 工具分类样式 - 适配180px×50px工具框 */
        .section-title {
            text-align: center;
            margin-bottom: 70px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--neutral-900);
            font-weight: 700;
            margin-bottom: 15px;
            display: inline-block;
            position: relative;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--primary);
            border-radius: 2px;
        }
        
        .section-title p {
            font-size: 1.1rem;
            color: var(--neutral-800);
            max-width: 700px;
            margin: 0 auto;
            opacity: 0.8;
        }
        
        .tool-categories {
            padding: 40px 0 100px;
        }
        
        .category-item {
            background: white;
            border-radius: var(--radius-lg);
            padding: 50px;
            margin-bottom: 90px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        
        .category-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 6px;
            height: 100%;
            background-color: var(--primary);
        }
        
        .category-item:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-lg);
        }
        
        .category-header {
            margin-bottom: 40px;
        }
        
        .category-item h3 {
            font-size: 2rem;
            color: var(--neutral-900);
            margin-bottom: 15px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .category-item h3 i {
            color: var(--primary);
            font-size: 1.8rem;
        }
        
        .category-item p {
            color: var(--neutral-800);
            font-size: 1.1rem;
            line-height: 1.7;
            max-width: 1000px;
            opacity: 0.9;
        }
        
        /* 工具列表样式 - 核心调整：适配180px宽工具框 */
        .tool-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, 180px); /* 固定180px列宽 */
            gap: 25px; /* 优化间距，适配窄工具框 */
            justify-content: center;
        }
        
        /* 工具显示框样式 - 固定180px×50px（核心需求） */
        .tool-item {
            width: 180px;
            height: 50px;
            background: var(--neutral-100);
            border-radius: var(--radius);
            padding: 0 15px; /* 适配窄宽度，减少内边距 */
            text-decoration: none;
            color: var(--neutral-800);
            transition: var(--transition);
            border: 1px solid var(--neutral-200);
            font-weight: 500;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            font-size: 0.95rem; /* 微调字体大小，适配窄宽度 */
        }
        
        .tool-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background-color: var(--primary);
            transform: scaleY(0);
            transition: var(--transition);
        }
        
        .tool-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.08);
            border-color: var(--primary-light);
            background-color: white;
            color: var(--primary);
        }
        
        .tool-item:hover::before {
            transform: scaleY(1);
        }
        
        .tool-item h4 {
            margin: 0;
            color: inherit;
            font-size: inherit;
            font-weight: inherit;
            text-align: center;
        }
        
        /* 查看更多工具按钮 */
        .view-more-tools {
            text-align: center;
            margin-top: 40px;
        }
        
        /* 新闻栏目样式 - 强化展示（核心需求） */
        .news-section {
            padding: 60px 0 120px;
            background-color: white;
            border-radius: var(--radius-lg);
            margin: 0 30px 80px;
            box-shadow: var(--shadow);
        }
        
        .news-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 40px;
            padding-bottom: 15px;
            border-bottom: 2px solid var(--neutral-200);
        }
        
        .news-header h2 {
            font-size: 2.2rem;
            color: var(--neutral-900);
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .news-header h2 i {
            color: var(--primary);
            font-size: 1.8rem;
        }
        
        .news-tabs {
            display: flex;
            gap: 15px;
        }
        
        .news-tab {
            padding: 8px 18px;
            background-color: var(--neutral-100);
            border-radius: 20px;
            font-weight: 500;
            transition: var(--transition);
            cursor: pointer;
        }
        
        .news-tab.active,
        .news-tab:hover {
            background-color: var(--primary);
            color: white;
        }
        
        .news-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); /* 适配新闻卡片宽度 */
            gap: 30px;
        }
        
        .news-card {
            background-color: var(--neutral-100);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--neutral-200);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        
        .news-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow);
            border-color: transparent;
        }
        
        .news-img {
            height: 180px; /* 优化图片高度，提升比例协调 */
            background-color: var(--neutral-200);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        
        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        
        .news-card:hover .news-img img {
            transform: scale(1.05);
        }
        
        .news-content {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .news-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 10px;
            font-size: 0.85rem;
        }
        
        .news-category {
            background-color: rgba(22, 93, 255, 0.1);
            color: var(--primary);
            padding: 3px 10px;
            border-radius: 12px;
            font-weight: 500;
        }
        
        .news-date {
            color: var(--neutral-800);
            opacity: 0.7;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .news-title {
            font-size: 1.15rem;
            margin-bottom: 10px;
            color: var(--neutral-900);
            transition: var(--transition);
            flex: 1;
        }
        
        .news-card:hover .news-title {
            color: var(--primary);
        }
        
        .news-excerpt {
            color: var(--neutral-800);
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 15px;
            opacity: 0.8;
        }
        
        .read-more {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            color: var(--primary);
            font-weight: 500;
            font-size: 0.9rem;
        }
        
        .read-more:hover {
            color: var(--primary-dark);
        }
        
        .read-more i {
            transition: transform 0.3s ease;
        }
        
        .news-card:hover .read-more i {
            transform: translateX(5px);
        }
        
        /* 底部样式 */
        .footer {
            background: linear-gradient(135deg, var(--neutral-900) 0%, var(--neutral-800) 100%);
            color: white;
            padding: 80px 0 40px;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 60px;
            margin-bottom: 60px;
        }
        
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 20px;
        }
        
        .footer-logo img {
            max-height: 60px;
        }
        
        .footer-logo-text {
            font-size: 22px;
            font-weight: 700;
        }
        
        .footer-desc {
            color: rgba(255,255,255,0.7);
            line-height: 1.7;
            margin-bottom: 30px;
        }
        
        .footer-social {
            display: flex;
            gap: 15px;
        }
        
        .social-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: rgba(255,255,255,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        
        .social-icon:hover {
            background-color: var(--primary);
            transform: translateY(-3px);
        }
        
        .footer-heading {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-heading::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--primary);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 15px;
        }
        
        .footer-links a {
            color: rgba(255,255,255,0.7);
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .footer-links a:hover {
            color: white;
            padding-left: 5px;
        }
        
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255,255,255,0.1);
            color: rgba(255,255,255,0.5);
            font-size: 0.9rem;
        }
        
        /* 响应式调整 - 适配180px工具框 */
        @media (max-width: 1200px) {
            .container {
                max-width: 1140px;
            }
            
            .banner h2 {
                font-size: 3.5rem;
            }
        }
        
        @media (max-width: 992px) {
            .container {
                max-width: 960px;
                padding: 0 20px;
            }
            
            .nav li {
                margin-left: 30px;
            }
            
            .banner {
                padding: 100px 0;
            }
            
            .banner h2 {
                font-size: 2.8rem;
            }
            
            .banner p {
                font-size: 1.3rem;
            }
            
            .category-item {
                padding: 40px;
            }
            
            .news-section {
                margin: 0 20px 60px;
            }
        }
        
        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            
            .nav {
                position: fixed;
                top: 0;
                right: -300px;
                width: 300px;
                height: 100%;
                background: white;
                box-shadow: -4px 0 20px rgba(0,0,0,0.1);
                transition: right 0.3s ease;
                z-index: 999;
                overflow-y: auto;
            }
            
            .nav.active {
                right: 0;
            }
            
            .nav ul {
                flex-direction: column;
                padding: 100px 30px 30px;
            }
            
            .nav li {
                margin: 10px 0;
            }
            
            .dropdown-menu {
                position: static;
                box-shadow: none;
                padding-left: 20px;
                margin-top: 5px;
                background: var(--neutral-100);
                border-radius: var(--radius-sm);
                transform: none;
            }
            
            .banner {
                padding: 80px 0;
                margin: 20px 0 50px;
            }
            
            .banner h2 {
                font-size: 2.2rem;
            }
            
            .banner p {
                font-size: 1.1rem;
            }
            
            .banner-btns {
                flex-direction: column;
                gap: 15px;
                align-items: center;
            }
            
            /* 工具列表响应式 - 适配180px工具框 */
            .tool-list {
                grid-template-columns: repeat(auto-fill, calc(50% - 12px));
                gap: 20px;
            }
            
            .tool-item {
                width: 100%;
                height: 50px;
                font-size: 0.9rem;
            }
            
            .category-item {
                padding: 30px 20px;
                margin-bottom: 60px;
            }
            
            .category-item h3 {
                font-size: 1.6rem;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
            
            .news-grid {
                grid-template-columns: 1fr;
                gap: 25px;
            }
            
            .news-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 15px;
            }
        }
        
        @media (max-width: 576px) {
            .container {
                padding: 0 15px;
            }
            
            .logo-text {
                font-size: 20px;
            }
            
            .logo img {
                max-height: 50px;
            }
            
            .banner h2 {
                font-size: 1.8rem;
            }
            
            .tool-list {
                grid-template-columns: 1fr;
            }
            
            .category-header {
                margin-bottom: 25px;
            }
            
            .news-section {
                margin: 0 15px 50px;
                padding: 40px 0 80px;
            }
            
            .news-card {
                margin: 0;
            }
            
            .footer-content {
                gap: 40px;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .animate-fade-in-up {
            animation: fadeInUp 0.6s ease forwards;
        }
        
        .delay-100 { animation-delay: 0.1s; }
        .delay-200 { animation-delay: 0.2s; }
        .delay-300 { animation-delay: 0.3s; }
        .delay-400 { animation-delay: 0.4s; }