* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        body {
            background: linear-gradient(145deg, #f9fcff 0%, #f1f5f9 100%);
            color: #0f172a;
            line-height: 1.5;
            min-height: 100vh;
        }
        .container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 1rem 1rem;
        }

        /* ===== 头部整体容器 - 纯白色背景 ===== */
        .header-wrapper {
            background: #ffffff;
            border-radius: 30px;
            padding: 0.8rem 2rem;
            margin-bottom: 3rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
            border: 1px solid #f0f0f0;
        }

        .header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: nowrap;
            gap: 1rem;
        }

        .logo {
            display: flex;
            align-items: center;
            flex-shrink: 0;
        }
        .logo-img {
            height: 36px;
            width: auto;
            display: block;
        }

        .nav {
            display: flex;
            align-items: center;
            flex: 1;
            justify-content: flex-end;
            position: relative;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }

        .nav a {
            color: #334155;
            text-decoration: none;
            font-weight: 500;
            transition: all 0.2s;
            font-size: 1rem;
            padding: 0.5rem 1.2rem;
            border-radius: 30px;
            white-space: nowrap;
        }
        .nav a:hover {
            color: #2563eb;
            background: rgba(37, 99, 235, 0.05);
        }
        .nav a.active {
            color: white;
            font-weight: 600;
            background: #2563eb;
        }

        /* 汉堡菜单按钮 */
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.5rem;
            margin-left: 1rem;
            flex-shrink: 0;
            z-index: 101;
        }
        .hamburger {
            display: block;
            width: 24px;
            height: 2px;
            background: #334155;
            position: relative;
            transition: background 0.2s;
        }
        .hamburger::before,
        .hamburger::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 2px;
            background: #334155;
            left: 0;
            transition: transform 0.3s;
        }
        .hamburger::before { top: -6px; }
        .hamburger::after { bottom: -6px; }

        /* 移动端菜单打开时的汉堡动画 */
        .nav.active .hamburger {
            background: transparent;
        }
        .nav.active .hamburger::before {
            transform: rotate(45deg);
            top: 0;
        }
        .nav.active .hamburger::after {
            transform: rotate(-45deg);
            bottom: 0;
        }

        .privacy-badge {
            background: rgba(16, 185, 129, 0.12);
            backdrop-filter: blur(4px);
            color: #065f46;
            padding: 0.5rem 1.2rem;
            border-radius: 40px;
            font-size: 0.95rem;
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            margin-bottom: 2.5rem;
            border: 1px solid rgba(16, 185, 129, 0.3);
            box-shadow: 0 2px 8px rgba(0,0,0,0.02);
        }
        .section-title {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 1.8rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            letter-spacing: -0.01em;
        }
        .section-title a {
            color: #2563eb;
            text-decoration: none;
            font-size: 1rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            background: rgba(37, 99, 235, 0.08);
            padding: 0.4rem 1rem;
            border-radius: 30px;
            transition: background 0.2s;
        }
        .section-title a:hover {
            background: rgba(37, 99, 235, 0.15);
        }
        .tool-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 1.2rem;
            margin-bottom: 4rem;
        }
        .tool-card {
            background: rgba(255,255,255,0.75);
            backdrop-filter: blur(2px);
            border-radius: 16px;
            padding: 1.3rem 0.5rem;
            text-align: center;
            box-shadow: 0 8px 18px -6px rgba(0,20,40,0.08), 0 0 0 1px rgba(0,0,0,0.02);
            border: 1px solid rgba(255,255,255,0.7);
            transition: all 0.25s ease;
            text-decoration: none;
            color: #1e293b;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        .tool-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 20px 24px -12px rgba(0,70,150,0.2);
            border-color: #b1d0ff;
            background: white;
        }
        .tool-emoji {
            font-size: 2.4rem;
            line-height: 1;
            margin-bottom: 0.4rem;
        }
        .tool-card span {
            display: block;
            font-size: 0.9rem;
            font-weight: 500;
            word-break: break-word;
        }
        .blog-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.8rem;
            margin: 1.8rem 0 2rem;
        }
        .blog-card {
            background: white;
            border-radius: 12px;
            padding: 1.6rem;
            box-shadow: 0 12px 24px -12px rgba(0,32,64,0.12);
            border: 1px solid #ecf3fa;
            transition: all 0.25s ease;
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
        }
        .blog-card:hover {
            transform: scale(1.02);
            box-shadow: 0 24px 32px -16px #1e4f8a33;
            border-color: #c7dfff;
        }
        .blog-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #0b1e33;
            line-height: 1.4;
        }
        .blog-card p {
            color: #475569;
            font-size: 0.9rem;
            margin-bottom: 1.2rem;
            flex: 1;
            line-height: 1.5;
        }
        .blog-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #5f6c84;
            font-size: 0.8rem;
            border-top: 1px dashed #dce5ef;
            padding-top: 1rem;
        }
        .blog-meta .date {
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .blog-meta .tag {
            background: #e4edfc;
            color: #1d4ed8;
            padding: 0.25rem 0.9rem;
            border-radius: 30px;
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

        /* 广告位 */
.ad-banner {

    padding: 0;  /* 移除内边距，让图片撑满 */
    text-align: center;
    background: transparent;  /* 透明背景 */
    border: none;  /* 移除边框 */
    min-height: auto;  /* 移除最小高度 */
    display: block;
    backdrop-filter: none;  /* 移除毛玻璃效果 */
}

.ad-link {
    display: block;
    width: 100%;
    text-decoration: none;
}

.ad-image {
    width: 100%;
    height: auto;
    max-width: 100%;
    border-radius: 16px; /* 可选，让图片也有圆角 */
    display: block;
}


        /* 友情链接 */
        .friend-links {
            margin-top: 4rem;
            padding: 2rem 0 1rem;
            border-top: 1px solid #d9e2ef;
            text-align: center;
        }
        .friend-links-title {
            font-size: 1rem;
            font-weight: 500;
            color: #5f6c84;
            margin-bottom: 1.5rem;
            letter-spacing: 1px;
        }
        .friend-links-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1.5rem 2rem;
        }
        .friend-links-grid a {
            color: #1e293b;
            text-decoration: none;
            font-size: 0.95rem;
            transition: color 0.2s;
        }
        .friend-links-grid a:hover {
            color: #2563eb;
        }

        .footer {
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 1px solid #d9e2ef;
            text-align: center;
            color: #5f6c84;
            font-size: 0.9rem;
        }
        .footer a {
            color: #1e293b;
            text-decoration: none;
            margin: 0 0.5rem;
            transition: color 0.2s;
        }
        .footer a:hover {
            color: #2563eb;
        }

        /* 响应式 */
        @media (max-width: 900px) {
            .tool-grid {
                grid-template-columns: repeat(5, 1fr);
            }
        }
        @media (max-width: 768px) {
            .header-wrapper {
                padding: 0.8rem 1.5rem;
            }
            
            /* 移动端：显示汉堡菜单，隐藏导航链接 */
            .nav-toggle {
                display: block;
            }
            
            .nav-menu {
                display: none;
                position: absolute;
                top: 45px;
                right: 0;
                left: auto;
                min-width: 200px;
                flex-direction: column;
                background: white;
                border-radius: 14px;
                box-shadow: 0 10px 30px rgba(0,0,0,0.15);
                padding: 0.8rem;
                border: 1px solid #edf2f7;
                z-index: 100;
            }
            
            .nav-menu a {
                width: 100%;
                text-align: left;
                padding: 0.8rem 1.2rem;
                white-space: normal;
            }
            
            .nav-menu a:not(:last-child) {
                border-bottom: 1px solid #f1f5f9;
            }
            
            .nav.active .nav-menu {
                display: flex;
            }
            
            .header {
                flex-wrap: nowrap;
            }
            
            .nav {
                justify-content: flex-end;
            }
        }
        @media (max-width: 600px) {
            .container { padding: 1rem; }
            
            .tool-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            
            .nav-menu {
                left: 0;
                right: 0;
                width: 100%;
            }
        }
        @media (max-width: 400px) {
            .tool-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }