/*
 * ChatGPT中文导航 - 样式表
 * 作者：ChatGPT中文导航团队
 * 日期：2025-01-27
 * 功能：科技感配色设计，优化SEO和用户体验
 */

/* 全局样式 - 科技感配色优化版本 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', Arial, sans-serif; /* 优化中文字体显示 */
}

/* 性能优化：减少重绘和回流 */
html {
    scroll-behavior: smooth;
    font-size: 16px; /* 基础字体大小 */
}

body {
    background: linear-gradient(135deg, #f4fbf8 0%, #d9f0e7 100%); /* 科技感渐变背景 */
    color: #2c3e50; /* 深蓝灰色文字 */
    line-height: 1.6;
    font-display: swap; /* 字体加载优化 */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 14px; /* 紧凑字体大小 */
}

/* 图片懒加载和优化 */
img {
    max-width: 100%;
    height: auto;
    loading: lazy; /* 原生懒加载 */
    decoding: async;
    border-radius: 8px; /* 圆角优化 */
}

/* 减少布局抖动 */
.container {
    contain: layout style;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 12px; /* 紧凑间距 */
}

/* 科技感色彩变量 */
:root {
    --primary-color: #10a37f; /* 主蓝色 */
    --secondary-color: #0f8b6d; /* 深蓝色 */
    --accent-color: #19c37d; /* 强调红色 */
    --text-primary: #2c3e50; /* 主文字色 */
    --text-secondary: #7f8c8d; /* 次要文字色 */
    --bg-primary: #ffffff; /* 主背景色 */
    --bg-secondary: #ecf0f1; /* 次要背景色 */
    --border-color: #bdc3c7; /* 边框色 */
    --shadow-light: 0 2px 10px rgba(16, 163, 127, 0.1); /* 浅阴影 */
    --shadow-medium: 0 4px 20px rgba(16, 163, 127, 0.15); /* 中等阴影 */
}

/* 面包屑导航样式 */
.breadcrumb {
    background-color: #f8f9fa;
    padding: 10px 0;
    border-bottom: 1px solid #e9ecef;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    font-size: 0.9rem;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
}

.breadcrumb-list li:not(:last-child)::after {
    content: '>';
    margin: 0 8px;
    color: #6c757d;
}

.breadcrumb-list a {
    color: #10a37f;
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb-list a:hover {
    color: #0f8b6d;
    text-decoration: underline;
}

.breadcrumb-list span[aria-current="page"] {
    color: #6c757d;
    font-weight: 500;
}

/* 顶部导航栏 - 科技感设计 */
.main-header {
    background: linear-gradient(90deg, var(--bg-primary) 0%, #f8fafc 100%); /* 渐变背景 */
    box-shadow: var(--shadow-medium);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 2px solid var(--primary-color); /* 蓝色底边 */
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0; /* 紧凑垂直间距 */
    min-height: 60px; /* 固定最小高度 */
}

.logo {
    display: flex;
    align-items: center;
    transition: transform 0.3s ease; /* 悬停动效 */
}

.logo:hover {
    transform: scale(1.05); /* 悬停放大效果 */
}

.logo img {
    height: 36px; /* 紧凑图标大小 */
    margin-right: 8px;
    filter: drop-shadow(0 2px 4px rgba(16, 163, 127, 0.3)); /* 图标阴影 */
}

.logo-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.logo-icon {
    margin-right: 8px;
    color: var(--primary-color);
    text-shadow: 0 1px 3px rgba(16, 163, 127, 0.3); /* 图标文字阴影 */
}

.logo h1,
.logo .site-title {
    font-size: 1.4rem; /* 紧凑标题大小 */
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: -0.5px; /* 字母间距优化 */
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 导航菜单样式 */
.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 8px; /* 紧凑间距 */
}

.main-nav li {
    position: relative;
}

.main-nav a {
    display: block;
    padding: 8px 16px; /* 紧凑内边距 */
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem; /* 紧凑字体 */
    border-radius: 6px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.main-nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(16, 163, 127, 0.1), transparent);
    transition: left 0.5s ease;
}

.main-nav a:hover::before {
    left: 100%; /* 滑动光效 */
}

.main-nav a:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

/* 搜索框样式 */
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 25px; /* 圆角搜索框 */
    padding: 4px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.search-box:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(16, 163, 127, 0.1);
}

.search-box input {
    border: none;
    outline: none;
    padding: 8px 12px;
    font-size: 0.9rem;
    background: transparent;
    color: var(--text-primary);
    width: 200px; /* 紧凑宽度 */
    transition: width 0.3s ease;
}

.search-box input:focus {
    width: 250px; /* 聚焦时扩展 */
}

.search-box input::placeholder {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.search-box button {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-box button:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-medium);
}

/* 内容图标样式 */
.content-icon-box {
    text-align: center;
    margin: 20px 0; /* 紧凑间距 */
}

.icon-container {
    display: inline-block;
    padding: 20px; /* 紧凑内边距 */
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(16, 163, 127, 0.1), rgba(15, 139, 109, 0.1));
    color: var(--primary-color);
    margin-bottom: 12px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.icon-container:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-medium);
}

.icon-caption {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 8px;
    font-weight: 500;
}

/* 项目卡片图标 */
.project-icon, .course-icon, .blog-icon, .tip-icon, .resource-icon {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 45px; /* 紧凑尺寸 */
    height: 45px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(16, 163, 127, 0.1), rgba(15, 139, 109, 0.1));
    color: var(--primary-color);
    font-size: 1.3rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
}

.project-icon:hover, .course-icon:hover, .blog-icon:hover, .tip-icon:hover, .resource-icon:hover {
    transform: scale(1.1);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

/* 页脚图标样式 */
.footer-logo .logo-icon {
    margin-bottom: 8px;
    color: var(--bg-primary);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}
}

.main-nav li {
    margin: 0 15px;
}

.main-nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.main-nav a:hover {
    color: #10a37f;
}

.search-box {
    display: flex;
    align-items: center;
}

.search-box input {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    outline: none;
}

.search-box button {
    background-color: #10a37f;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
}

/* 首页英雄区 - 科技感设计 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, #1e3a8a 100%);
    color: white;
    padding: 120px 0; /* 增加高度，更加大气 */
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 500px; /* 设置最小高度 */
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>') repeat;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 2.2rem; /* 紧凑标题大小 */
    margin-bottom: 16px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: -0.5px;
}

.hero-content p {
    font-size: 1.1rem; /* 紧凑字体大小 */
    max-width: 600px; /* 紧凑最大宽度 */
    margin: 0 auto 24px;
    line-height: 1.5;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 12px; /* 紧凑按钮间距 */
    flex-wrap: wrap;
}

/* 按钮样式 - 科技感设计 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px; /* 紧凑内边距 */
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem; /* 紧凑字体 */
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    min-width: 120px; /* 最小宽度 */
    text-align: center;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%; /* 滑动光效 */
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-light);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    background: linear-gradient(135deg, var(--secondary-color), #1e3a8a);
}

.btn-secondary {
    background: var(--bg-primary);
    color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-light);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* 大号按钮样式 */
.btn-large {
    padding: 15px 30px;
    font-size: 1.1rem;
    min-width: 160px;
    font-weight: bold;
}

/* 功能亮点样式 */
.feature-highlight {
    text-align: center;
    padding: 30px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    margin: 20px 0;
    backdrop-filter: blur(10px);
}

.feature-icon {
    color: #10a37f;
    margin-bottom: 15px;
}

.feature-description {
    font-size: 1.1rem;
    color: #2c3e50;
    font-weight: 500;
    margin: 0;
}

/* 步骤图标样式 */
.step-icon {
    text-align: center;
    margin-top: 15px;
    color: #10a37f;
}

/* 相关资源图标样式 */
.related-list a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.related-list a:hover {
    background-color: rgba(16, 163, 127, 0.1);
}

.related-list i {
    color: #10a37f;
    font-size: 1.2rem;
    width: 20px;
    text-align: center;
}

/* 页面头部按钮样式 */
.page-actions .btn-primary {
    background: white !important;
    color: #333 !important;
    border: 2px solid white !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1) !important;
}

.page-actions .btn-primary:hover {
    background: #f8f8f8 !important;
    border-color: #f8f8f8 !important;
    color: #000 !important;
    transform: translateY(-2px) !important;
}

/* GPT中文版按钮特殊样式 */
.hero-buttons .btn-primary {
    background: linear-gradient(135deg, #ff6b35, #f7931e);
    color: white;
    border: 2px solid #ff6b35;
    font-size: 1.2rem;
    padding: 15px 30px;
    font-weight: bold;
    border-radius: 30px;
    box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.hero-buttons .btn-primary:hover {
    background: linear-gradient(135deg, #e55a2b, #e8851a);
    border-color: #e55a2b;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
}

.hero-buttons .btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    font-size: 1.1rem;
    padding: 15px 30px;
    font-weight: 600;
    border-radius: 30px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.hero-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.2);
    color: white;
}

/* 内容区块 - 紧凑设计 */
.section {
    padding: 40px 0; /* 紧凑垂直间距 */
    position: relative;
}

.section:nth-child(even) {
    background: rgba(16, 163, 127, 0.02); /* 交替背景色 */
}

.section-header {
    text-align: center;
    margin-bottom: 30px; /* 紧凑底部间距 */
}

.section-header h2 {
    font-size: 1.8rem; /* 紧凑标题大小 */
    color: var(--text-primary);
    margin-bottom: 12px;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-header p {
    color: var(--text-secondary);
    max-width: 600px; /* 紧凑最大宽度 */
    margin: 0 auto;
    font-size: 0.95rem;
    line-height: 1.5;
}

/* 卡片样式 - 科技感设计 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); /* 紧凑最小宽度 */
    gap: 20px; /* 紧凑间距 */
    margin-top: 30px;
}

.intro-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
    background: var(--bg-primary);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(16, 163, 127, 0.1);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.card:hover::before {
    transform: scaleX(1);
}

.card:hover {
    transform: translateY(-8px); /* 紧凑悬停效果 */
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.card-image {
    height: 160px; /* 紧凑图片高度 */
    overflow: hidden;
    display: flex;
    background: linear-gradient(135deg, rgba(16, 163, 127, 0.05), rgba(15, 139, 109, 0.05));
    justify-content: center;
    align-items: center;
    position: relative;
}

.card-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(16, 163, 127, 0.1) 50%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover .card-image::after {
    opacity: 1;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.card:hover .card-image img {
    transform: scale(1.05);
}

.card-content {
    padding: 16px; /* 紧凑内边距 */
}

.card-content h3 {
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 1.1rem; /* 紧凑标题大小 */
    font-weight: 600;
    line-height: 1.3;
}

.card-content p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-size: 0.9rem; /* 紧凑字体大小 */
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-footer {
    padding: 12px 16px; /* 紧凑内边距 */
    background: rgba(16, 163, 127, 0.02);
    text-align: center;
    display: flex;
    justify-content: space-between;
    gap: 8px;
    border-top: 1px solid rgba(16, 163, 127, 0.1);
}

.card-footer .btn {
    flex: 1;
    padding: 6px 10px; /* 紧凑按钮内边距 */
    font-size: 0.85rem;
    border-radius: 6px;
    font-weight: 500;
}

/* 详情页样式 - 科技感设计 */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 50px 0; /* 紧凑垂直间距 */
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>') repeat;
    opacity: 0.3;
}

.page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.page-header-content h1 {
    font-size: 2rem; /* 紧凑标题大小 */
    margin-bottom: 12px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.page-header-content p {
    font-size: 1rem; /* 紧凑字体大小 */
    max-width: 600px;
    margin: 0 auto 20px auto;
    opacity: 0.95;
    line-height: 1.5;
}

.page-actions {
    margin-top: 16px;
}

.page-actions .btn {
    margin-right: 8px;
    padding: 8px 16px;
    font-size: 0.9rem;
}

.page-content {
    padding: 40px 0; /* 紧凑垂直间距 */
}

.content-wrapper {
    display: grid;
    grid-template-columns: 7fr 3fr;
    gap: 30px; /* 紧凑间距 */
}

.main-content {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    padding: 24px; /* 紧凑内边距 */
    border: 1px solid rgba(16, 163, 127, 0.1);
}

.content-section {
    margin-bottom: 30px; /* 紧凑底部间距 */
}

.content-section h2 {
    font-size: 1.6rem; /* 紧凑标题大小 */
    color: var(--text-primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
    position: relative;
    font-weight: 600;
}

.content-section h2::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--secondary-color);
}

.content-section p {
    margin-bottom: 12px; /* 紧凑段落间距 */
    line-height: 1.6;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.image-showcase {
    margin: 20px 0; /* 紧凑图片间距 */
    text-align: center;
    position: relative;
}

.image-showcase img {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.image-showcase img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-medium);
}

.image-caption {
    margin-top: 8px;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.85rem;
}

/* 步骤指南 - 科技感设计 */
.step-guide {
    margin: 24px 0; /* 紧凑间距 */
}

.step {
    display: flex;
    margin-bottom: 24px; /* 紧凑间距 */
    padding: 16px;
    background: rgba(16, 163, 127, 0.02);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.step:hover {
    background: rgba(16, 163, 127, 0.05);
    transform: translateX(4px);
}

.step-number {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    width: 36px; /* 紧凑尺寸 */
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
    margin-right: 16px;
    font-size: 0.9rem;
    box-shadow: var(--shadow-light);
}

.step-content {
    flex-grow: 1;
}

.step-content h3 {
    font-size: 1.2rem; /* 紧凑标题大小 */
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.step-content p {
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.step-image {
    margin-top: 12px;
}

.step-image img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow-light);
    transition: transform 0.3s ease;
}

.step-image img:hover {
    transform: scale(1.02);
}

/* 对比表格 - 科技感设计 */
.comparison-table {
    margin: 20px 0; /* 紧凑间距 */
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    border: 1px solid rgba(16, 163, 127, 0.1);
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
}

.comparison-table th, .comparison-table td {
    padding: 10px 12px; /* 紧凑内边距 */
    text-align: left;
    border-bottom: 1px solid rgba(16, 163, 127, 0.1);
    font-size: 0.9rem;
}

.comparison-table th {
    background: linear-gradient(135deg, rgba(16, 163, 127, 0.1), rgba(15, 139, 109, 0.1));
    color: var(--text-primary);
    font-weight: 600;
}

.comparison-table tr:hover {
    background: rgba(16, 163, 127, 0.05);
}

/* FAQ样式 - 科技感设计 */
.faq-list {
    margin: 20px 0; /* 紧凑间距 */
}

.faq-item {
    margin-bottom: 16px; /* 紧凑间距 */
    padding: 16px;
    background: rgba(16, 163, 127, 0.02);
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.faq-item:hover {
    background: rgba(16, 163, 127, 0.05);
    transform: translateX(4px);
}

.faq-item:last-child {
    margin-bottom: 0;
}

.faq-item h3 {
    font-size: 1.1rem; /* 紧凑标题大小 */
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
}

.faq-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* 侧边栏 - 科技感设计 */
.sidebar {
    position: sticky;
    top: 90px; /* 紧凑顶部距离 */
}

.widget {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    padding: 20px; /* 紧凑内边距 */
    margin-bottom: 24px; /* 紧凑间距 */
    border: 1px solid rgba(16, 163, 127, 0.1);
    transition: all 0.3s ease;
}

.widget:hover {
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.widget h3 {
    font-size: 1.2rem; /* 紧凑标题大小 */
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
    color: var(--text-primary);
    font-weight: 600;
    position: relative;
}

.widget h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--secondary-color);
}

.toc-list, .related-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin-bottom: 8px; /* 紧凑间距 */
}

.toc-list a {
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    padding: 4px 8px;
    border-radius: 6px;
    display: block;
}

.toc-list a:hover {
    color: var(--primary-color);
    background: rgba(16, 163, 127, 0.1);
    transform: translateX(4px);
}

.related-list li {
    margin-bottom: 12px; /* 紧凑间距 */
}

.related-list a {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    padding: 8px;
    border-radius: 8px;
    font-size: 0.9rem;
}

.related-list a:hover {
    color: var(--primary-color);
    background: rgba(16, 163, 127, 0.1);
    transform: translateX(4px);
}

.related-list img {
    width: 50px; /* 紧凑尺寸 */
    height: 50px;
    border-radius: 8px;
    margin-right: 8px;
    object-fit: cover;
    box-shadow: var(--shadow-light);
}

/* 底部区域 - 科技感设计 */
.main-footer {
    background: linear-gradient(135deg, var(--text-primary) 0%, #2c3e50 100%);
    color: #fff;
    padding: 40px 0 16px; /* 紧凑垂直间距 */
    position: relative;
    overflow: hidden;
}

.main-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="footerGrid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23footerGrid)"/></svg>') repeat;
}

.main-footer .container {
    position: relative;
    z-index: 1;
}

/* ChatGPT模型简介样式 - 科技感设计 */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); /* 紧凑最小宽度 */
    gap: 16px; /* 紧凑间距 */
    margin-top: 24px;
}

.model-item {
    background: var(--bg-primary);
    border-radius: 12px;
    padding: 16px; /* 紧凑内边距 */
    box-shadow: var(--shadow-light);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(16, 163, 127, 0.1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.model-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.model-item:hover::before {
    transform: scaleX(1);
}

.model-item:hover {
    transform: translateY(-6px); /* 紧凑悬停效果 */
    box-shadow: var(--shadow-medium);
    border-color: var(--primary-color);
}

.model-item h4 {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1.1rem; /* 紧凑标题大小 */
    font-weight: 600;
}

.model-item p {
    color: var(--text-secondary);
    font-size: 0.9rem; /* 紧凑字体大小 */
    line-height: 1.5;
    margin: 0;
}

.model-item .model-link {
    display: inline-block;
    margin-top: 12px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); /* 紧凑最小宽度 */
    gap: 24px; /* 紧凑间距 */
    margin-bottom: 24px;
}

.footer-column h3 {
    font-size: 1.1rem; /* 紧凑标题大小 */
    margin-bottom: 16px;
    color: #fff;
    font-weight: 600;
    position: relative;
    padding-bottom: 8px;
}

.footer-column h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--primary-color);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 8px; /* 紧凑间距 */
}

.footer-links a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.8);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    padding: 4px 0;
    display: block;
}

.footer-links a:hover {
    color: var(--primary-color);
    transform: translateX(4px);
}

.footer-bottom {
    text-align: center;
    padding-top: 16px; /* 紧凑内边距 */
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem; /* 紧凑字体大小 */
}

/* 汉堡菜单按钮样式 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 30px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background-color: #333;
    border-radius: 3px;
    opacity: 1;
    left: 0;
    transform: rotate(0deg);
    transition: .25s ease-in-out;
}

.menu-toggle.active span:nth-child(1) {
    top: 9px;
    transform: rotate(135deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
    left: -60px;
}

.menu-toggle.active span:nth-child(3) {
    top: 9px;
    transform: rotate(-135deg);
}

/* 移动端导航菜单折叠样式 */
@media (max-width: 768px) {
    .main-header .container {
        display: flex !important;
        justify-content: space-between !important;
        align-items: center !important;
        padding: 10px 20px !important;
        flex-wrap: nowrap !important;
    }
    
    .logo {
        flex: 1 !important;
        display: flex !important;
        align-items: center !important;
        gap: 10px !important;
        order: 1 !important;
    }
    
    .logo-icon {
        font-size: 1.5rem !important;
        margin-right: 8px !important;
    }
    
    .logo h1 {
        font-size: 1.2rem !important;
        margin: 0 !important;
        white-space: nowrap !important;
    }
    
    .menu-toggle {
        display: flex !important;
        order: 2 !important;
        flex-shrink: 0 !important;
    }
    
    .search-box {
        display: none !important;
    }
    
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        box-shadow: var(--shadow-medium);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 1000;
        order: 3;
        width: 100%;
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav ul {
        flex-direction: column;
        padding: 20px 0;
        gap: 0;
    }
    
    .main-nav li {
        margin: 0;
        border-bottom: 1px solid rgba(16, 163, 127, 0.1);
    }
    
    .main-nav a {
        padding: 15px 20px;
        border-radius: 0;
        display: block;
        width: 100%;
    }
}

/* 响应式设计 - 优化 */
@media (max-width: 992px) {
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 20px; /* 紧凑间距 */
    }
    
    .sidebar {
        position: static;
        margin-top: 20px;
    }
    
    .section {
        padding: 30px 0; /* 紧凑垂直间距 */
    }
    
    .page-header {
        padding: 40px 0; /* 紧凑垂直间距 */
    }
}

@media (max-width: 768px) {
    /* 移动端header布局已在上方定义，此处不再重复设置 */
    
    .logo {
        margin-bottom: 0; /* 重置间距 */
    }
    
    .hero-content h1 {
        font-size: 2rem; /* 紧凑移动端标题 */
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .model-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px; /* 紧凑间距 */
    }
    
    .main-nav li {
        margin: 4px 8px; /* 紧凑间距 */
    }
    
    .search-box {
        width: 100%;
        margin-top: 12px; /* 紧凑间距 */
    }
    
    .search-box input {
        width: 100%;
        font-size: 0.9rem;
        padding: 8px 12px;
    }
    
    .step {
        flex-direction: column;
        padding: 12px; /* 紧凑内边距 */
    }
    
    .step-number {
        margin-bottom: 8px; /* 紧凑间距 */
        margin-right: 0;
        align-self: flex-start;
    }
    
    .page-header-content h1 {
        font-size: 1.8rem; /* 移动端紧凑标题 */
    }
    
    .page-header-content p {
        font-size: 0.9rem;
    }
    
    .main-content {
        padding: 16px; /* 移动端紧凑内边距 */
    }
    
    .widget {
        padding: 16px; /* 移动端紧凑内边距 */
    }
    
    .comparison-table {
        font-size: 0.8rem;
    }
    
    .comparison-table th, .comparison-table td {
        padding: 8px 6px; /* 移动端紧凑表格 */
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px; /* 超小屏幕紧凑间距 */
    }
    
    .hero-content h1 {
        font-size: 1.8rem;
    }
    
    .hero-content p {
        font-size: 0.9rem;
    }
    
    .btn {
        padding: 8px 16px;
        font-size: 0.85rem;
    }
    
    .card-content {
        padding: 12px;
    }
    
    .model-item {
        padding: 12px;
    }
}

@media (max-width: 576px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons .btn {
        display: block;
        margin: 10px auto;
        width: 80%;
    }
}

/* ChatGPT充值弹窗样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: linear-gradient(135deg, var(--bg-primary) 0%, rgba(255, 255, 255, 0.95) 100%);
    margin: 10% auto;
    padding: 30px;
    border-radius: 16px;
    width: 90%;
    max-width: 400px;
    position: relative;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(16, 163, 127, 0.2);
    animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close {
    color: var(--text-secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s ease;
    position: absolute;
    right: 20px;
    top: 15px;
}

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

.qr-container {
    text-align: center;
    padding: 20px 0;
}

.qr-container h3 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 1.3rem;
    font-weight: 600;
}

.qr-container p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1rem;
}

.qr-container img {
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    transition: transform 0.3s ease;
}

.qr-container img:hover {
    transform: scale(1.05);
}

/* 移动端弹窗适配 */
@media (max-width: 480px) {
    .modal-content {
        margin: 20% auto;
        padding: 20px;
        width: 95%;
    }
    
    .qr-container h3 {
        font-size: 1.1rem;
    }
    
    .qr-container p {
        font-size: 0.9rem;
    }
    
    .qr-container img {
        width: 180px !important;
        height: 180px !important;
    }
}