/* =========================================
   1. 全局设置 & 字体引入
   ========================================= */
/* 引入谷歌字体 */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600;700&family=Open+Sans:wght@400;600&display=swap');

body { 
    font-family: 'Open Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif; 
    margin: 0; 
    color: #4a4a4a; 
    line-height: 1.7; 
    background-color: #f8f9fa; 
}

img { max-width: 100%; height: auto; border-radius: 8px; }
a { text-decoration: none; transition: 0.3s; }
.container { width: 90%; max-width: 1200px; margin: 0 auto; padding: 20px 0; }

h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    color: #2c3e50;
    margin-top: 0;
}

/* =========================================
   2. 组件样式 (按钮、卡片)
   ========================================= */
/* 按钮通用样式 */
.btn { 
    background: #ff9f43; 
    color: white; 
    padding: 12px 30px; 
    border-radius: 50px; 
    display: inline-block; 
    font-weight: 600;
    box-shadow: 0 4px 10px rgba(255, 159, 67, 0.3); 
}
.btn:hover { 
    transform: translateY(-2px); 
    box-shadow: 0 6px 15px rgba(255, 159, 67, 0.4); 
    background: #e68a35;
}

/* 基础网格布局 */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card { background: #fff; border: 1px solid #eee; padding: 15px; border-radius: 12px; box-shadow: 0 4px 10px rgba(0,0,0,0.05); }


/* =========================================
   3. 导航栏 (Navigation)
   ========================================= */
nav { background: #fff; box-shadow: 0 2px 15px rgba(0,0,0,0.05); position: sticky; top: 0; z-index: 1000; }
nav .container { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; }
.logo { font-size: 1.5rem; font-weight: bold; color: #2c3e50; }
.nav-links a { color: #555; margin-left: 20px; font-weight: 600; font-size: 0.95rem; }
.nav-links a:hover, .nav-links a.active { color: #ff9f43; }


/* =========================================
   4. 页面特定：语言选择页 (Index)
   ========================================= */
/* --- 语言选择页容器 --- */
.lang-screen {
    position: relative; /* 设定基准，为了让里面的绝对定位生效 */
    height: 100vh;
    width: 100%;
    overflow: hidden; /* 防止图片放大时撑破屏幕 */
    /* 注意：这里不再设置 background-image，因为图片移到 html 里了 */
}

/* --- 1. 轮播背景层设置 --- */
.slideshow {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1; /* 最底层 */
}

.slide-item {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0; /* 默认隐藏 */
    animation: zoomFade 15s infinite; /* 15秒循环一次 */
}

/* 核心技巧：设置不同的延迟时间，让它们轮流显示 */
/* 这里的算法是：总时间15秒 / 3张图 = 每张图间隔5秒 */
.slide-item:nth-child(1) { animation-delay: 0s; }
.slide-item:nth-child(2) { animation-delay: 5s; }
.slide-item:nth-child(3) { animation-delay: 10s; }

/* 定义动画：淡入淡出 + 缓慢放大 */
@keyframes zoomFade {
    0% { opacity: 0; transform: scale(1); }
    10% { opacity: 1; }      /* 1.5秒内浮现 */
    33% { opacity: 1; }      /* 保持显示约5秒 */
    43% { opacity: 0; transform: scale(1.1); } /* 慢慢放大并消失 */
    100% { opacity: 0; }
}

/* --- 2. 黑色半透明遮罩层 --- */
.overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.4); /* 0.4 代表40%的黑色透明度 */
    z-index: 2; /* 中间层 */
}

/* --- 3. 内容层 (文字和按钮) --- */
.content-box {
    position: relative;
    z-index: 3; /* 最顶层，确保按钮能被点击 */
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
}

/* 按钮样式保持不变 */
.lang-btn {
    display: block; width: 200px; padding: 15px; margin: 15px auto;
    border: 2px solid white; color: white; text-decoration: none;
    font-size: 1.1rem; border-radius: 50px; transition: 0.3s;
}
.lang-btn:hover { background: white; color: #333; transform: scale(1.05); }
.lang-btn.primary { background: #ff9f43; border-color: #ff9f43; font-weight: bold; }


/* =========================================
   5. 页面特定：首页 (Home)
   ========================================= */
/* --- 修复后的 Hero 区域 (针对你的照片优化) --- */
.hero { 
    /* 1. 背景图设置 */
    /* 注意：这里加深了遮罩层(0.3 -> 0.4)，让背景稍暗一点，衬托文字和人 */
    background: linear-gradient(to right, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.1) 60%), url('images/home.jpg'); 
    background-size: cover; 
    background-position: center 70%; /* 确保照片居中 */
    
    /* 2. 布局控制 (关键) */
    height: 80vh; /* 高度稍微调高一点，更有大气感 */
    display: flex; 
    align-items: center; /* 垂直居中 */
    justify-content: flex-start; /* 水平靠左 (原先是 center) */
    
    /* 3. 文字通用设置 */
    color: white; /* 强制白色文字 */
    text-align: left; /* 文字左对齐 */
    padding-left: 5%; /* 给左边留出 10% 的呼吸空间，不要紧贴屏幕边缘 */
    position: relative;
}

/* 针对 Hero 里面的文字单独优化 */
.hero h1 { 
    font-size: 3.5rem; /* 字号加大 */
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.2;
    color: white;
}

.hero p { 
    font-size: 1.4rem; 
    margin-bottom: 30px;
    max-width: 600px; /* 限制这行字的宽度，防止它太长撞到你的脸上 */
    text-shadow: 0 2px 5px rgba(0,0,0,0.8);
    opacity: 0.9;
}

/* 按钮样式微调 */
.btn {
    font-size: 1.1rem;
    padding: 12px 35px;
    box-shadow: 0 4px 15px rgba(255, 159, 67, 0.4); /* 给按钮加个发光阴影 */
}

/* --- 手机端适配 (手机屏幕窄，我们要改回居中) --- */
@media (max-width: 768px) {
    .hero {
        justify-content: center; /* 手机上改回居中 */
        text-align: center;      /* 文字居中 */
        padding-left: 0;         /* 取消左边距 */
        padding: 0 20px;         /* 左右给点空隙 */
        background-position: 65% center; /* 手机上把照片稍微往左挪一点，让人露出来 */
    }
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1.1rem; max-width: 100%; }
}


/* =========================================
   6. 页面特定：路线列表页 (Tour List)
   ========================================= */
.page-header { text-align: center; margin: 40px 0; }
.page-header h1 { font-size: 2.5rem; color: #2c3e50; margin-bottom: 10px; }
.page-header p { color: #777; }

/* 左图右文布局 */
/* --- 修复后的路线列表样式 --- */

.tour-row {
    display: flex; 
    gap: 30px; 
    background: white; 
    border: 1px solid #eee;
    margin-bottom: 30px; 
    border-radius: 12px; 
    overflow: hidden; /* 第一把锁：确保整个卡片圆角不被图片遮住 */
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    /* 增加一个最大高度，防止图片如果是竖图把卡片撑得太高 */
    max-height: 500px; 
}

.tour-img-box { 
    flex: 1; /* 宽度占比 */
    min-height: 250px; 
    position: relative; /* 关键：作为图片的定位基准 */
    overflow: hidden;   /* 第二把锁：图片超出这个框的部分，直接“剪掉” */
}

.tour-img-box img { 
    width: 100%; 
    height: 100%; 
    object-fit: cover; /* 核心：让图片像壁纸一样铺满，自动裁剪，不变形 */
    position: absolute; /* 绝对定位：强制图片服从盒子的大小，而不是图片撑大盒子 */
    top: 0;
    left: 0;
}

.tour-info-box { 
    flex: 1.5; 
    padding: 30px; 
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    overflow-y: auto; /* 如果文字实在太多，让文字滚动，而不是撑大盒子 */
}

/* 手机端适配：取消高度限制，变成上下排列 */
@media (max-width: 768px) {
    .tour-row { 
        flex-direction: column; 
        max-height: none; /* 手机上取消高度限制 */
    }
    .tour-img-box { 
        height: 250px; /* 手机上图片固定高度 */
        min-height: 250px;
    }
    .tour-img-box img {
        position: relative; /* 手机上恢复正常流 */
    }
}


/* =========================================
   7. 页面特定：详情页深度美化 (Detail Page)
   ========================================= */
/* 7.1 详情页大图 Header */
.detail-header {
    height: 60vh;
    background-size: cover; background-position: center;
    position: relative;
    display: flex; align-items: flex-end;
}
.detail-header::after {
    content: ''; position: absolute; top:0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.8) 100%);
}
.detail-header .page-header {
    position: relative; z-index: 2; color: white;
    text-align: left; 
    padding: 0 50px 50px 50px; margin: 0 auto; width: 100%; max-width: 1200px;
}
.detail-header h1 { 
    font-size: 3.2rem; margin-bottom: 15px; color: white; 
    text-shadow: 0 2px 10px rgba(0,0,0,0.3); 
}
.tour-meta span {
    display: inline-block; background: rgba(255,255,255,0.2); 
    backdrop-filter: blur(5px); padding: 5px 12px; border-radius: 20px;
    margin-right: 10px; font-size: 0.9rem; font-weight: 600;
}

/* 7.2 模块通用 */
.content-section { margin-bottom: 50px; }

/* 7.3 亮点网格 (Highlights) */
.highlights-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); 
    gap: 25px; margin-top: 30px;
}
.highlight-card {
    background: #fff; padding: 25px; border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.05);
    display: flex; align-items: flex-start;
}
.highlight-icon { font-size: 2rem; margin-right: 15px; color: #ff9f43; }
.highlight-text h4 { margin-bottom: 5px; font-size: 1.1rem; }
.highlight-text p { margin: 0; font-size: 0.9rem; color: #777; }

/* 7.4 行程时间轴 (Itinerary) - 已修复遮挡问题 */
.itinerary-timeline { margin-top: 30px; padding-left: 10px; }

.itinerary-item {
    display: flex; 
    gap: 25px; 
    padding-bottom: 40px;
    border-left: 3px solid #eee; /* 竖线 */
    position: relative;
    
    /* 🔥 关键修复：增加左内边距，把文字推开，不让圆点挡住 */
    padding-left: 30px; 
}

.itinerary-item:last-child { border-left: 3px solid transparent; } 

.itinerary-item::before {
    content: ''; width: 16px; height: 16px; background: #fff; 
    border: 4px solid #ff9f43; border-radius: 50%;
    position: absolute; 
    
    /* 🔥 关键修复：调整圆点位置，使其垂直居中于竖线 */
    left: -11.5px; 
    
    top: 0px;
    box-shadow: 0 0 0 4px rgba(255,159,67,0.15); /* 光晕 */
}
.time-tag { font-weight: 700; color: #2c3e50; min-width: 60px; font-family: 'Montserrat', sans-serif; }
.itinerary-content { 
    flex: 1; background: #fff; padding: 20px; 
    border-radius: 0 12px 12px 12px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.03);
}

/* 7.5 包含项目 (Included) */
.included-box {
    background: #fff; padding: 30px; border-radius: 16px;
    border: 2px solid #eef2f5;
    box-shadow: 0 5px 20px rgba(239, 242, 245, 0.5);
}
.included-list { 
    list-style: none; padding: 0; margin-top: 20px;
    display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px;
}
.included-list li { display: flex; align-items: center; font-weight: 600; color: #555; }
.included-list li::before {
    content: '✓'; display: inline-flex; justify-content: center; align-items: center;
    width: 24px; height: 24px; background: #e8f5e9; color: #27ae60;
    border-radius: 50%; margin-right: 10px; font-size: 14px; font-weight: bold;
}

/* 7.6 底部悬浮预订栏 */
.booking-bar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid #eee; padding: 15px 0;
    position: sticky; bottom: 0; z-index: 999;
    box-shadow: 0 -5px 20px rgba(0,0,0,0.08);
}
.price-label { font-size: 0.9rem; color: #888; display: block; }
.price-tag { font-size: 1.8rem; color: #e74c3c; font-weight: 700; font-family: 'Montserrat', sans-serif;}


/* =========================================
   8. 页脚 & 移动端适配
   ========================================= */
footer { text-align: center; padding: 40px; background: #2c3e50; color: #aaa; margin-top: 60px; }

@media (max-width: 768px) {
    .hero h1, .detail-header h1 { font-size: 2rem; }
    nav .container { flex-direction: column; gap: 10px; }
    .nav-links a { margin: 0 10px; font-size: 0.9rem; }
    
    /* 列表页竖排 */
    .tour-row { flex-direction: column; }
    .tour-img-box { height: 200px; }
    
    /* 详情页适配 */
    .detail-header { height: 50vh; }
    .detail-header .page-header { padding: 30px 20px; }
    .itinerary-item { flex-direction: column; gap: 5px; }
    .time-tag { margin-bottom: 5px; }
}

/* =========================================
   9. 新增：用户反馈页样式 (Reviews)
   ========================================= */

/* 总体评分栏 */
.rating-summary {
    background: #fff; padding: 40px; border-radius: 12px;
    text-align: center; margin-bottom: 50px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
.big-score { font-size: 3.5rem; font-weight: 800; color: #2c3e50; line-height: 1; font-family: 'Montserrat', sans-serif;}
.stars-yellow { color: #ff9f43; font-size: 1.5rem; margin: 10px 0; }

/* 评论卡片 */
.review-card {
    background: #fff; padding: 30px; border-radius: 16px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    border: 1px solid #f0f0f0; position: relative;
    transition: 0.3s;
}
.review-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.08); }

/* 装饰性引号 */
.quote-icon-bg {
    position: absolute; top: 20px; right: 20px;
    font-size: 3rem; color: #f0f2f5; font-family: serif;
}

/* 用户信息区 */
.reviewer-profile { display: flex; align-items: center; margin-bottom: 15px; }
.avatar {
    width: 50px; height: 50px; background: #eee; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: bold; color: #888; margin-right: 15px; font-size: 1.2rem;
}
.reviewer-info h4 { margin: 0; font-size: 1rem; color: #333; }
.review-date { font-size: 0.8rem; color: #999; }
.review-text { color: #555; font-style: italic; line-height: 1.6; }

/* 留言表单 */
.review-form-box {
    max-width: 600px; margin: 0 auto; background: white; padding: 40px;
    border-radius: 16px; box-shadow: 0 5px 30px rgba(0,0,0,0.05);
}
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #444; }
.form-control {
    width: 100%; padding: 12px; border: 2px solid #eee; border-radius: 8px;
    font-family: inherit; font-size: 1rem; box-sizing: border-box; transition: 0.3s;
}
.form-control:focus { border-color: #ff9f43; outline: none; }

/* =========================================
   10. 新增：照片墙样式 (Gallery)
   ========================================= */
.gallery-section {
    margin-bottom: 80px;
}
.gallery-grid {
    display: grid;
    /* 自动适应宽度，手机显示1列，电脑显示4列 */
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); 
    gap: 15px;
    margin-top: 30px;
}
.gallery-item {
    height: 250px; /* 固定高度，保证整齐 */
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    cursor: pointer;
}
.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover; /* 关键：裁剪图片以填满格子，不变形 */
    transition: transform 0.5s ease;
}
.gallery-item:hover img {
    transform: scale(1.1); /* 鼠标悬停时轻微放大 */
}
/* =========================================
   10. 新增：关于我 (About Page) 专属样式
   ========================================= */

/* 头部介绍区：照片+基本信息 */
.about-hero {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 50px;
    margin-bottom: 60px;
}

.about-photo-frame {
    flex: 1;
    min-width: 300px;
    position: relative;
}

.about-photo-frame img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 20px 20px 0 #f0f2f5; /* 简单的装饰性阴影 */
}

.about-intro-text {
    flex: 1.5;
    min-width: 300px;
}

.greeting {
    color:#ff9f43; /* 使用变量，方便后期统一修改 */
    font-weight: 700;            /* 加粗，让文字更醒目 */
    letter-spacing: 1px;         /* 字体变大后，间距可以稍微收一点点，看起来更紧凑 */
    text-transform: uppercase;   /* 保持大写风格 */
    
    /* --- 修改重点 --- */
    font-size: 1.2rem;           /* 调大：原 0.9rem -> 现 1.2rem */
    font-family: 'Montserrat', sans-serif; /* 换字体：使用更具设计感的 Montserrat */
    
    margin-bottom: 15px;         /* 字变大了，下边距也稍微增加一点，呼吸感更好 */
    display: block;
}
.about-intro-text h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
    color: #2c3e50;
}

/* 语言技能标签 */
.language-badges {
    display: flex;
    gap: 10px;
    margin: 20px 0;
}
.badge {
    padding: 6px 15px;
    background: #e3f2fd;
    color: #2196f3;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
}
.badge.es { background: #fff3e0; color: #ff9800; } /* 西语用橙色 */
.badge.en { background: #e8f5e9; color: #4caf50; } /* 英语用绿色 */

/* 经历部分 */
.experience-section {
    margin-bottom: 60px;
    line-height: 1.8;
    color: #555;
}

/* 理念展示框 - 现代轻盈版 */
.philosophy-box {
    /* 背景：从纯白过渡到极淡的蓝色，像清晨的空气 */
    background: linear-gradient(180deg, #ffffff 0%, #f3f8fb 100%);
    
    /* 边框：极细的浅灰色，增加精致感 */
    border: 1px solid rgba(0, 0, 0, 0.04);
    
    /* 阴影：大范围的柔和阴影，让卡片浮起来 */
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
    
    /* 圆角与内边距 */
    border-radius: 24px;
    padding: 60px 50px;
    margin-bottom: 60px;
    position: relative;
    text-align: center; /* 居中对齐显得更优雅 */
}

/* 标题样式 */
.philosophy-box h3 {
    color: #2c3e50; /* 深灰蓝色，保持可读性 */
    font-size: 1.6rem;
    margin-bottom: 25px;
    display: inline-block;
    position: relative;
    padding-bottom: 15px;
    border: none; /* 去掉原本的横线 */
}

/* 标题下面的小装饰线 */
.philosophy-box h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: #3498db; /* 品牌蓝 */
    border-radius: 2px;
}

/* 内容文字 */
.philosophy-content {
    color: #666; /* 柔和的灰色 */
    font-size: 1.15rem;
    line-height: 1.9;
    font-weight: 300; /* 字体稍微细一点，显精致 */
    max-width: 800px;
    margin: 0 auto;
}

/* 装饰：背景里的巨大淡色双引号 */
.philosophy-box::before {
    content: '"';
    position: absolute;
    top: -20px;
    left: 20px;
    font-size: 150px;
    line-height: 1;
    font-family: serif; /* 衬线体 */
    color: rgba(52, 152, 219, 0.05); /* 极淡的蓝色 */
    pointer-events: none;
}
/* 装饰背景字 */
.bg-deco-text {
    position: absolute;
    bottom: -20px;
    right: 20px;
    font-size: 8rem;
    font-weight: 900;
    color: rgba(255,255,255,0.05);
    z-index: 1;
    pointer-events: none;
}
/* =========================================
   毛玻璃返回按钮样式 (Glassmorphism Back Button)
   ========================================= */

.back-btn-glass {
    display: inline-flex;       /* 让图标和文字横向排列 */
    align-items: center;        /* 垂直居中对齐 */
    gap: 8px;                   /* 图标和文字之间的间距 */
    
    /* 玻璃效果核心代码 */
    background: rgba(255, 255, 255, 0.15); /* 15%透明度的白色 */
    backdrop-filter: blur(10px);           /* 背景模糊 */
    -webkit-backdrop-filter: blur(10px);   /* 兼容苹果 Safari 浏览器 */
    border: 1px solid rgba(255, 255, 255, 0.3); /* 半透明边框，增加质感 */
    
    /* 尺寸与字体 */
    padding: 10px 25px;
    border-radius: 50px;        /* 胶囊圆角 */
    color: #ffffff;
    text-decoration: none;      /* 去掉下划线 */
    font-size: 0.95rem;
    font-weight: 500;
    
    /* 动画过渡 */
    transition: all 0.3s ease;
    
    /* 布局微调 */
    margin-bottom: 20px;        /* 与下方大标题拉开距离 */
    align-self: flex-start;     /* 确保它在容器左侧（如果父容器是 flex） */
}

/* 鼠标悬停效果 */
.back-btn-glass:hover {
    background: rgba(255, 255, 255, 0.3); /* 变亮一点 */
    transform: translateX(-5px);           /* 向左轻微移动，暗示“返回” */
    box-shadow: 0 5px 15px rgba(0,0,0,0.2); /* 增加阴影 */
}

/* 手机端适配：如果屏幕太小，稍微改小一点 */
@media (max-width: 768px) {
    .back-btn-glass {
        padding: 8px 20px;
        font-size: 0.9rem;
    }
}
/* =========================================
   手机导航栏适配 (Mobile Navigation)
   ========================================= */

/* 1. 基础设置：让导航栏左右撑开 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: white;
    position: relative; /* 关键：为了让下拉菜单定位 */
    box-shadow: 0 2px 10px rgba(0,0,0,0.05); /* 加个小阴影好看 */
}

/* Logo 样式微调 */
.logo a {
    font-size: 1.5rem;
    font-weight: bold;
    color: #333;
    text-decoration: none;
}

/* 2. 默认（电脑端）隐藏汉堡图标 */
.menu-toggle {
    display: none; 
}

/* 3. 手机端专用样式 */
@media (max-width: 768px) {
    
    /* 显示汉堡图标 */
    .menu-toggle {
        display: block;
        font-size: 1.8rem;
        cursor: pointer;
        color: #333;
    }

    /* 改造菜单链接列表：变成绝对定位的下拉框 */
    .nav-links {
        display: none; /* 默认隐藏菜单 */
        position: absolute;
        top: 100%; /* 在导航栏正下方 */
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column; /* 竖着排 */
        align-items: center;    /* 居中对齐 */
        padding: 20px 0;
        box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        z-index: 1000; /* 保证在最上层 */
    }

    /* 激活状态：当 JS 给它加上 active 类时，变成 flex 显示出来 */
    .nav-links.active {
        display: flex;
    }

    /* 给每个链接加点间距，方便手指点击 */
    .nav-links li {
        margin: 15px 0;
        width: 100%;        /* 占满整行 */
        text-align: center; /* 文字居中 */
    }
}