:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --bg-color: #f8fafc;
    --text-color: #1f2937;
    --card-bg: #ffffff;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.main-header {
    background-color: var(--card-bg);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: transform 0.3s ease, background-color 0.3s;
}

.main-header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* 基础样式 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    height: 60px;
    position: relative;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}

.logo i {
    margin-right: 8px;
    color: var(--primary-color);
}

/* 菜单按钮 - 默认隐藏 */
.menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: #333;
    cursor: pointer;
    padding: 5px;
    transition: color 0.3s;
}

.menu-btn:hover {
    color: var(--primary-color);
}

/* 导航链接 */
.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links li {
    margin-left: 20px;
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 移动端菜单样式 */
.menu-btn {
    display: none; /* 默认隐藏菜单按钮 */
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 10px;
    transition: color 0.3s;
}

.menu-btn:hover, .menu-btn:focus {
    color: var(--primary-color);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo a {
    text-decoration: none;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 导航链接样式调整 */
.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center; /* 确保所有项目垂直居中 */
}

.nav-links li {
    margin-left: 20px;
}

.nav-links a {
    display: flex;
    align-items: center; /* 确保图标和文字垂直居中 */
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    padding: 8px 0; /* 增加垂直内边距 */
    line-height: normal; /* 确保行高正常 */
}

.nav-links a i {
    margin-right: 6px;
    font-size: 0.9em; /* 稍微调整图标大小 */
}

.nav-links a:hover {
    color: var(--primary-color);
}

.hero {
    padding-top: 80px;
    height: 400px; /* 或其他合适的固定高度 */
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    text-align: center;
    animation: fadeIn 1s ease-out;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    font-weight: 500;
    margin-top: 2rem;
}

.cta-button:hover {
    transform: translateY(-2px);
    background: var(--secondary-color);
}

.container {
    max-width: 1200px;
    margin: 80px auto 0;
    padding: 2rem;
}

.tools-grid h2 {
    text-align: center;
    margin-bottom: 3rem;
}

.tools-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.tool-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    animation: fadeInUp 0.6s ease-out backwards;
}

.tool-card:hover {
    transform: translateY(-5px);
}

.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(37, 99, 235, 0.1));
    opacity: 0;
    transition: var(--transition);
    z-index: 0; /* 确保装饰效果在链接之下 */
}

.tool-card:hover::before {
    opacity: 1;
}

.tool-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.tool-card h3 {
    margin-bottom: 1rem;
}

.tool-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    background: var(--primary-color);
    color: white !important; /* 确保链接文字颜色 */
    text-decoration: none !important; /* 确保没有下划线 */
    transition: var(--transition);
    border: none;
    font-weight: 500;
    margin-top: 1rem;
    cursor: pointer; /* 添加鼠标指针效果 */
    position: relative; /* 添加相对定位 */
    z-index: 1; /* 确保链接在最上层 */
}

.tool-link:hover {
    transform: translateY(-2px);
    background: var(--secondary-color);
    color: white !important;
}

/* 游戏卡片特殊样式 */
.game-highlight {
    border: 2px solid var(--primary-color);
    box-shadow: 0 8px 15px rgba(37, 99, 235, 0.15);
    transform: translateY(0);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.game-highlight:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(37, 99, 235, 0.2);
}

.game-highlight .tool-link {
    background-color: #3b82f6;
    color: white;
    padding: 10px 15px;
    border-radius: 5px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: bold;
    transition: background-color 0.3s;
}

.game-highlight .tool-link:hover {
    background-color: #2563eb;
    text-decoration: none;
}

.tag.game {
    background-color: #8b5cf6;
    color: white;
}

.tag.entertainment {
    background-color: #ec4899;
    color: white;
}

.main-footer {
    background-color: var(--text-color);
    color: white;
    padding: 4rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: #e5e7eb;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    max-width: 1200px;
    margin: 2rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 0.875rem;
}

/* 热门工具部分样式 */
.popular-section {
    padding: 4rem 2rem;
    background: linear-gradient(to right, var(--bg-color), white);
}

.popular-tools {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.popular-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out backwards;
}

.popular-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(37, 99, 235, 0.1));
    opacity: 0;
    transition: var(--transition);
    z-index: 0; /* 确保装饰效果在链接之下 */
}

.popular-card:hover::before {
    opacity: 1;
}

.popularity-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--accent-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.popular-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 关于我们部分样式 */
.about-section {
    padding: 4rem 2rem;
    background: var(--bg-color);
}

.about-content {
    max-width: 1200px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.about-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: var(--transition);
    animation: fadeInUp 0.6s ease-out backwards;
}

.about-card:hover {
    transform: translateY(-5px);
}

.about-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.about-card h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-color);
    text-decoration: none;
    margin-top: 1rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    background: rgba(37, 99, 235, 0.1);
    transition: all 0.3s;
}

.contact-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.about-card .fa-envelope {
    color: var(--accent-color);
}

/* 用户菜单和登录模态框样式 */
.user-menu {
    position: relative;
}

.user-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background-color 0.3s;
}

.user-btn:hover {
    background: var(--primary-dark);
}

.login-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.login-container {
    background-color: white;
    width: 90%;
    max-width: 400px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    padding: 20px;
    position: relative;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 24px;
    cursor: pointer;
    color: #777;
}

.close-btn:hover {
    color: #333;
}

.tabs {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
    color: #777;
    position: relative;
    transition: color 0.3s;
}

.tab-btn.active {
    color: var(--primary-color);
    font-weight: bold;
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
}

.tab-content {
    padding: 15px 0;
}

.tab-content.hidden {
    display: none;
}

.tab-content h3 {
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
    color: #333;
}

.form-group {
    position: relative;
    margin-bottom: 20px;
}

.form-group label {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #777;
}

.form-group input {
    width: 100%;
    padding: 12px 15px 12px 40px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(var(--primary-rgb), 0.1);
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    font-size: 14px;
}

.forgot-password {
    color: var(--primary-color);
    text-decoration: none;
}

.forgot-password:hover {
    text-decoration: underline;
}

.submit-btn {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.submit-btn:hover {
    background-color: var(--primary-dark);
}

.social-login {
    margin-top: 20px;
    text-align: center;
}

.social-login p {
    color: #777;
    font-size: 14px;
    margin-bottom: 10px;
    position: relative;
}

.social-login p::before,
.social-login p::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30%;
    height: 1px;
    background-color: #eee;
}

.social-login p::before {
    left: 0;
}

.social-login p::after {
    right: 0;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.social-icons button {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid #ddd;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
}

.social-icons button:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 删除重复的定义，保留一个完整的定义 */
.form-agreement {
    font-size: 14px;
    margin-bottom: 20px;
    white-space: nowrap; /* 确保文本不换行 */
}

.form-agreement a {
    color: var(--primary-color);
    text-decoration: none;
    display: inline-block; /* 确保链接不被拆分 */
}

.form-agreement a:hover {
    text-decoration: underline;
}

/* 针对非常小的屏幕可能需要水平滚动 */
@media (max-width: 400px) {
    .form-agreement {
        overflow-x: auto; /* 允许水平滚动而不是换行 */
        padding-bottom: 5px; /* 为可能的滚动条留出空间 */
    }
    
    .form-agreement label {
        display: inline-block; /* 确保标签在小屏幕上也是内联 */
        white-space: nowrap; /* 确保不换行 */
    }
}

/* 服务条款样式 */
.agreement-label {
    display: flex !important;
    align-items: center !important;
    white-space: nowrap !important;
    overflow-x: auto !important;
    padding-bottom: 5px !important;
}

.agreement-checkbox {
    margin-right: 5px !important;
    flex-shrink: 0 !important;
}

.agreement-text {
    white-space: nowrap !important;
    font-size: 14px !important;
}

/* 内联协议样式 */
.inline-agreement {
    display: flex;
    align-items: center;
    font-size: 14px;
    white-space: nowrap;
}

.inline-agreement input[type="checkbox"] {
    margin-right: 8px;
    flex-shrink: 0;
}

.inline-agreement span {
    white-space: nowrap;
}

.inline-agreement a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 2px;
}

.inline-agreement a:hover {
    text-decoration: underline;
}

/* 移动端样式 */
@media (max-width: 768px) {
    .menu-btn {
        display: block; /* 在移动端显示菜单按钮 */
        position: absolute;
        right: 15px;
        top: 50%;
        transform: translateY(-50%);
        z-index: 1002;
    }
    
    .nav-links {
        position: fixed;
        top: 60px; /* 匹配导航栏高度 */
        left: -100%; /* 初始隐藏在屏幕外 */
        width: 80%;
        max-width: 300px;
        height: calc(100vh - 60px);
        background: #fff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        transition: left 0.3s ease-in-out;
    }

    .navbar {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: 1rem;
    }

    .logo {
        order: 1;
    }

    .menu-btn {
        order: 2;
        margin-left: auto;
        display: block;
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: var(--card-bg);
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        display: flex;
        flex-direction: column;
    }
    
    .nav-links li {
        width: 100%;
        text-align: center;
    }
    
    .nav-links li a {
        padding: 1rem;
        display: block;
        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    }
    
    .hero {
        height: 300px; /* 移动端稍微降低高度 */
        padding-top: 60px;
        text-align: center;
    }
    
    .hero-content {
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem; /* 移动端稍微减小标题大小 */
    }
    
    .cta-button {
        width: 100%;
        justify-content: center;
        margin-top: 2rem;
    }

    .main-header {
        padding: 0.5rem 0;
    }

    .tool-card {
        margin: 0 1rem;
    }

    .popular-section,
    .about-section {
        padding: 2rem 1rem;
    }
    
    .popular-card,
    .about-card {
        margin: 0 1rem;
    }
    
    .popularity-badge {
        position: static;
        margin: 0 auto 1rem;
        width: fit-content;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: var(--card-bg);
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
        transform: translateY(-150%);
        transition: var(--transition);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .hero-content {
        padding: 2rem 1rem;
    }

    .tools-container, .popular-tools, .about-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }

    .footer-section {
        text-align: left;  /* 改为左对齐 */
        padding: 0.5rem;
    }

    .footer-section h4 {
        margin-bottom: 0.5rem;
        font-size: 1rem;
    }

    .footer-section p {
        margin: 0.25rem 0;
        font-size: 0.9rem;
    }

    .footer-section ul {
        display: flex;
        flex-wrap: wrap;  /* 添加换行支持 */
        gap: 1rem;
        margin: 0;
        padding: 0;
        list-style: none;
        justify-content: flex-start;  /* 改为左对齐 */
    }

    .footer-section ul li {
        margin: 0;
    }

    /* 优化联系方式显示 */
    .footer-section:nth-child(2) p {
        display: block;  /* 改为块级显示 */
        margin: 0.25rem 0;  /* 统一上下间距 */
    }

    .footer-bottom {
        padding: 0.5rem;
        text-align: center;  /* 版权信息保持居中 */
        font-size: 0.8rem;
    }

    .menu-btn {
        display: block; /* 只在移动端显示菜单按钮 */
    }

    .nav-links {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: var(--card-bg);
        padding: 1rem;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .nav-links.active {
        display: flex;
        flex-direction: column;
    }

    /* 优化导航栏布局 */
    .navbar {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0.8rem 1rem;
        background: var(--card-bg);
    }

    /* 工具卡片网格布局 */
    .tools-container {
        grid-template-columns: repeat(2, 1fr); /* 改为两列布局 */
        gap: 1rem;
        padding: 0 0.5rem;
    }

    /* 热门工具布局 */
    .popular-tools {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        padding: 0 0.5rem;
    }

    /* 关于我们卡片布局 */
    .about-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        padding: 0 0.5rem;
    }

    /* 调整卡片边距和内边距 */
    .tool-card,
    .popular-card,
    .about-card {
        margin: 0;
        padding: 1.5rem;
    }

    /* 优化卡片内容 */
    .tool-card h3,
    .popular-card h3,
    .about-card h3 {
        font-size: 1.1rem;
        margin-bottom: 0.5rem;
    }

    .tool-card p,
    .popular-card p,
    .about-card p {
        font-size: 0.9rem;
        line-height: 1.4;
    }

    /* 调整图标大小 */
    .tool-card i,
    .popular-card i,
    .about-card i {
        font-size: 2rem;
    }

    /* 优化按钮样式 */
    .tool-link,
    .cta-button {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    /* 调整区段间距 */
    .container,
    .popular-section,
    .about-section {
        padding: 2rem 1rem;
    }

    .user-menu {
        width: 100%;
        margin-top: 10px;
    }
    
    .user-btn {
        width: 100%;
        justify-content: center;
    }
    
    .navbar {
        padding: 0.8rem 1rem;
    }
    
    .menu-btn {
        display: block; /* 在移动端显示菜单按钮 */
        order: 3;
        margin-left: 15px;
        z-index: 101;
    }
    
    .nav-links {
        position: fixed;
        top: 60px; /* 与导航栏高度匹配 */
        right: -100%; /* 初始位于屏幕外 */
        width: 80%; /* 占据屏幕大部分但不是全部 */
        max-width: 300px;
        height: calc(100vh - 60px);
        background-color: white;
        display: flex;
        flex-direction: column;
        padding: 1rem;
        box-shadow: -2px 0 5px rgba(0, 0, 0, 0.1);
        transition: right 0.3s ease;
        z-index: 100;
    }
    
    .nav-links.active {
        right: 0; /* 显示菜单 */
    }
    
    .nav-links li {
        margin: 0;
        width: 100%;
        margin-bottom: 15px;
    }
    
    .nav-links a, .user-btn {
        padding: 12px 15px;
        width: 100%;
        justify-content: flex-start;
        font-size: 16px;
    }
    
    .user-menu {
        width: 100%;
    }
    
    .user-btn {
        text-align: left;
        background: none;
        border: none;
        color: #333;
        display: flex;
        align-items: center;
        font-weight: 500;
        cursor: pointer;
        transition: color 0.3s;
        padding: 12px 15px;
    }
    
    .user-btn i {
        margin-right: 6px;
    }
    
    .user-btn:hover, .nav-links a:hover {
        color: var(--primary-color);
        background-color: rgba(37, 99, 235, 0.1);
        border-radius: 4px;
    }
    
    /* 当菜单打开时，添加遮罩 */
    .menu-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 99;
    }
    
    .menu-overlay.active {
        display: block;
    }

    /* 移动端菜单样式优化 */
    .menu-btn {
        display: block;
        border: none;
        background: none;
        font-size: 1.5rem;
        cursor: pointer;
        z-index: 1001;
        color: var(--text-color);
        transition: color 0.3s;
    }
    
    .menu-btn:hover {
        color: var(--primary-color);
    }
    
    .nav-links {
        position: fixed;
        top: 0;
        right: -300px;
        width: 250px;
        height: 100vh;
        background: white;
        box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        padding: 70px 20px 20px 20px;
        z-index: 1000;
        transition: right 0.3s cubic-bezier(0.17, 0.84, 0.44, 1);
        overflow-y: auto;
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-links li {
        margin: 0 0 15px 0;
        width: 100%;
    }
    
    .nav-links a, .nav-links .user-btn {
        display: flex;
        align-items: center;
        width: 100%;
        padding: 12px 15px;
        font-size: 16px;
        color: var(--text-color);
        border-radius: 6px;
        transition: all 0.2s ease;
    }
    
    .nav-links a i, .nav-links .user-btn i {
        margin-right: 10px;
        width: 20px;
        text-align: center;
        font-size: 1.1em;
        color: var(--primary-color);
    }
    
    .nav-links a:hover, .nav-links .user-btn:hover {
        background-color: rgba(37, 99, 235, 0.1);
        color: var(--primary-color);
        transform: translateX(5px);
    }
    
    .menu-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        backdrop-filter: blur(2px);
        z-index: 999;
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .menu-overlay.active {
        display: block;
        opacity: 1;
    }
}

/* 更小屏幕的设备（如手机横屏） */
@media (max-width: 480px) {
    /* 在更小的屏幕上恢复单列布局 */
    .tools-container,
    .popular-tools,
    .about-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

/* 小屏幕额外优化 */
@media (max-width: 480px) {
    .messages-section h2 {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }
    
    .message-form-section,
    .messages-display {
        padding: 15px;
        margin: 0 5px;
    }
    
    .message-item {
        padding: 12px;
        margin-bottom: 12px;
    }
    
    .message-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
        margin-bottom: 8px;
    }
    
    .message-author {
        font-size: 0.85rem;
        margin-bottom: 2px;
    }
    
    .message-time {
        font-size: 0.75rem;
        align-self: flex-start;
    }
    
    .message-content {
        font-size: 0.85rem;
        line-height: 1.4;
        margin-bottom: 10px;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
    
    .messages-header h3 {
        font-size: 1.1rem;
    }
    
    .message-filter {
        flex-wrap: wrap;
        gap: 5px;
    }

    .message-form-section {
        padding: 20px;
        margin: 0 5px;
    }
    
    .message-form .form-group {
        margin-bottom: 25px;
    }
    
    .message-form label {
        margin-bottom: 12px;
        font-size: 0.9rem;
        display: block;
        clear: both;
        font-weight: 600;
        line-height: 1.4;
    }
    
    .message-form label i {
        margin-right: 8px;
        width: 18px;
        display: inline-block;
    }
    
    .message-form input,
    .message-form textarea {
        padding: 12px 15px;
        font-size: 16px;
        border-radius: 10px;
        margin-top: 3px;
    }
    
    .submit-message-btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .char-count {
        font-size: 0.8rem;
        margin-top: 4px;
    }
}

@media (min-width: 769px) {
    .nav-links {
        display: flex;
        gap: 2rem;
        margin-right: 2rem;
    }

    .nav-links li a {
        color: var(--text-color);
        text-decoration: none;
        transition: color 0.3s;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

    .nav-links li a:hover {
        color: var(--primary-color);
    }
}

.tools-container .tool-card:nth-child(1) { animation-delay: 0.1s; }
.tools-container .tool-card:nth-child(2) { animation-delay: 0.2s; }
.tools-container .tool-card:nth-child(3) { animation-delay: 0.3s; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 动画延迟 */
.nav-links li:nth-child(1) { transition-delay: 0.1s; }
.nav-links li:nth-child(2) { transition-delay: 0.2s; }
.nav-links li:nth-child(3) { transition-delay: 0.3s; }

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #e5e7eb;
        --card-bg: #2d2d2d;
    }

    .main-header.scrolled {
        background-color: rgba(45, 45, 45, 0.95);
    }

    .tool-card {
        border-color: rgba(255, 255, 255, 0.1);
    }

    .footer-bottom {
        border-color: rgba(255, 255, 255, 0.2);
    }
}

/* AI工具卡片特殊样式 */
.ai-highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
    border: none;
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.ai-highlight::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%), 
                linear-gradient(-45deg, rgba(255,255,255,0.1) 25%, transparent 25%), 
                linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.1) 75%), 
                linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.1) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    opacity: 0.1;
    animation: float 20s infinite linear;
}

.ai-highlight .tool-content {
    position: relative;
    z-index: 1;
}

.ai-highlight:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4);
}

.ai-highlight i {
    color: white;
    font-size: 3rem;
}

.ai-highlight h3 {
    color: white;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.ai-highlight p {
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.ai-highlight .tool-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.ai-highlight .tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.ai-highlight .tag.ai {
    background: rgba(139, 92, 246, 0.3);
    border-color: rgba(139, 92, 246, 0.5);
}

.ai-highlight .tag.smart {
    background: rgba(34, 197, 94, 0.3);
    border-color: rgba(34, 197, 94, 0.5);
}

.ai-highlight .tag.hot {
    background: rgba(239, 68, 68, 0.3);
    border-color: rgba(239, 68, 68, 0.5);
}

.ai-highlight .tool-link {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.ai-highlight .tool-link:hover {
    background: white;
    color: var(--primary-color);
    border-color: white;
    transform: translateY(-2px);
}

@keyframes float {
    0% {
        background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    }
    100% {
        background-position: 20px 20px, 20px 30px, 30px 10px, 10px 20px;
    }
}

/* =============== 留言功能样式 =============== */
.messages-section {
    padding: 80px 20px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    margin-top: 40px;
}

.messages-content {
    max-width: 1200px;
    margin: 0 auto;
}

.messages-section h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--text-color);
    margin-bottom: 3rem;
    font-weight: 700;
}

.messages-section h2 i {
    color: var(--primary-color);
    margin-right: 10px;
}

.messages-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    align-items: start;
}

/* 留言表单样式 */
.message-form-section {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.1);
    position: sticky;
    top: 100px;
}

.message-form-section h3 {
    color: var(--text-color);
    font-size: 1.5rem;
    margin-bottom: 25px;
    text-align: center;
    font-weight: 600;
}

.message-form .form-group {
    margin-bottom: 25px;
    position: relative;
}

.message-form label {
    display: block;
    margin-bottom: 12px;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.4;
    clear: both;
    padding: 2px 0;
}

.message-form label i {
    color: var(--primary-color);
    margin-right: 8px;
    width: 18px;
    display: inline-block;
    text-align: center;
}

.message-form input,
.message-form textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
    background: #f9fafb;
    box-sizing: border-box;
    margin-top: 4px;
}

.message-form input:focus,
.message-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.message-form textarea {
    resize: vertical;
    min-height: 100px;
}

.char-count {
    text-align: right;
    font-size: 0.85rem;
    color: #6b7280;
    margin-top: 5px;
}

.char-count.warning {
    color: var(--accent-color);
}

.char-count.danger {
    color: var(--error-color);
}

.submit-message-btn {
    width: 100%;
    padding: 14px 20px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.submit-message-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
}

.submit-message-btn:active {
    transform: translateY(0);
}

/* 留言展示区域样式 */
.messages-display {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(37, 99, 235, 0.1);
}

.messages-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f1f5f9;
}

.messages-header h3 {
    color: var(--text-color);
    font-size: 1.3rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.message-count {
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.message-filter {
    display: flex;
    gap: 8px;
}

.filter-btn {
    padding: 6px 16px;
    border: 2px solid #e5e7eb;
    background: white;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 留言列表样式 */
.messages-list {
    max-height: 600px;
    overflow-y: auto;
    padding-right: 10px;
}

.messages-list::-webkit-scrollbar {
    width: 6px;
}

.messages-list::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 3px;
}

.messages-list::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 3px;
}

.message-item {
    background: #f8fafc;
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid #e2e8f0;
    transition: var(--transition);
    position: relative;
}

.message-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
    gap: 15px;
}

.message-author {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: var(--text-color);
    flex-shrink: 0;
}

.message-author i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

.message-time {
    display: flex;
    align-items: center;
    gap: 5px;
    color: #6b7280;
    font-size: 0.85rem;
    flex-shrink: 0;
    text-align: right;
}

.message-time i {
    font-size: 0.8rem;
}

.message-content {
    color: var(--text-color);
    line-height: 1.6;
    margin-bottom: 15px;
    font-size: 0.95rem;
    word-wrap: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
}

.message-actions {
    display: flex;
    gap: 10px;
}

.like-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    background: none;
    border: 1px solid #e5e7eb;
    padding: 6px 12px;
    border-radius: 20px;
    color: #6b7280;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

.like-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.like-btn.liked {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 加载更多按钮 */
.load-more {
    text-align: center;
    margin-top: 30px;
}

.load-more-btn {
    padding: 12px 24px;
    background: linear-gradient(135deg, #64748b, #475569);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.load-more-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(100, 116, 139, 0.3);
}

/* 提示消息样式 */
.message-notification {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: 15px 20px;
    background: var(--success-color);
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    z-index: 1001;
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

.message-notification.show {
    transform: translateX(0);
}

.message-notification.error {
    background: var(--error-color);
}

/* 响应式设计 */
@media (max-width: 968px) {
    .messages-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .message-form-section {
        position: static;
        order: 2;
    }
    
    .messages-display {
        order: 1;
    }
}

@media (max-width: 768px) {
    .messages-section {
        padding: 60px 15px;
    }
    
    .messages-section h2 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .message-form-section,
    .messages-display {
        padding: 20px;
    }
    
    .message-form-section h3 {
        font-size: 1.3rem;
        margin-bottom: 20px;
    }
    
    .message-form .form-group {
        margin-bottom: 20px;
    }
    
    .message-form label {
        margin-bottom: 10px;
        font-size: 0.9rem;
        line-height: 1.5;
    }
    
    .message-form input,
    .message-form textarea {
        padding: 12px 14px;
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .messages-header {
        flex-direction: column;
        gap: 15px;
        align-items: stretch;
        margin-bottom: 20px;
    }
    
    .messages-header h3 {
        text-align: center;
        font-size: 1.2rem;
        margin-bottom: 10px;
    }
    
    .message-filter {
        justify-content: center;
    }
    
    .messages-list {
        max-height: 400px;
    }
    
    .message-item {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .message-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        margin-bottom: 10px;
    }
    
    .message-author {
        font-size: 0.9rem;
    }
    
    .message-time {
        font-size: 0.8rem;
    }
    
    .message-content {
        font-size: 0.9rem;
        line-height: 1.5;
        margin-bottom: 12px;
    }
}

/* 超小屏幕优化 */
@media (max-width: 480px) {
    .message-form-section {
        padding: 15px;
        margin: 0 5px;
    }
    
    .message-form .form-group {
        margin-bottom: 18px;
    }
    
    .message-form label {
        margin-bottom: 8px;
        font-size: 0.85rem;
        display: block;
        clear: both;
    }
    
    .message-form label i {
        margin-right: 6px;
        width: 16px;
    }
    
    .message-form input,
    .message-form textarea {
        padding: 10px 12px;
        font-size: 16px;
        border-radius: 8px;
    }
    
    .submit-message-btn {
        padding: 12px 20px;
        font-size: 0.9rem;
    }
    
    .char-count {
        font-size: 0.8rem;
        margin-top: 4px;
    }
}