/* E-ink 优化字体样式 */
body {
    background-color: #ffffff; /* 纯白背景 */
    font-family: 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', 'DejaVu Sans', 'Liberation Sans', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 500; /* 增加字重以提高 e-ink 可读性 */
    font-size: 16px;
    line-height: 1.7; /* 提高行高以改善可读性 */
    color: #000; /* 纯黑文字提高对比度 */
    -webkit-font-smoothing: subpixel-antialiased; /* E-ink 设备更适合 */
    -moz-osx-font-smoothing: auto;
}

/* 标题字体优化 */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', 'DejaVu Sans', 'Liberation Sans', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 600;
    color: #000;
    line-height: 1.4;
}

/* 按钮和导航元素字体 */
.tab, .btn, button, input {
    font-family: 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei UI', 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', 'DejaVu Sans', 'Liberation Sans', 'Helvetica Neue', Arial, sans-serif;
    font-weight: 600; /* 按钮使用更重的字体 */
}

/* 描述性文字 */
.description, .subtitle, .app-description, .device-description {
    font-weight: 500;
    color: #333; /* 稍微浅一点但仍保持高对比度 */
}

/* 优化的导航标签样式 - 解决边框对齐问题 */
.tabs {
    border: 2px solid #333;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
}

.tab {
    position: relative;
    background-color: #fff;
    border: none;
    color: #666;
    transition: all 0.2s ease;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0;
    /* 移除内边距，让活动状态完全填充 */
}

.tab:hover {
    background-color: #f8f8f8;
    color: #333;
}

.tab.active {
    background-color: #333;
    color: #fff;
    /* 确保完全填充到边框 */
    margin: 0;
}

/* 桌面版标签分隔线 */
.tab:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 60%;
    background-color: #ddd;
    transition: opacity 0.2s ease;
}

.tab.active::after,
.tab.active + .tab::before {
    opacity: 0;
}

/* 移动设备优化 */
@media (max-width: 600px) {
    .tabs {
        flex-direction: column;
        border-radius: 12px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }
    
    .tab {
        border-bottom: 1px solid #ddd;
        padding: 18px 20px;
        font-size: 16px;
        min-height: 56px;
        touch-action: manipulation;
        /* 移除圆角以确保完美对齐 */
        border-radius: 0;
    }
    
    .tab:first-child {
        border-top-left-radius: 10px;
        border-top-right-radius: 10px;
    }
    
    .tab:last-child {
        border-bottom: none;
        border-bottom-left-radius: 10px;
        border-bottom-right-radius: 10px;
    }
    
    .tab:not(:last-child)::after {
        display: none;
    }
    
    .tab.active {
        /* 确保活动标签在移动设备上完美对齐 */
        margin: -1px;
        border: 1px solid #333;
        z-index: 1;
    }
}

@media (max-width: 480px) {
    .tab {
        padding: 16px 15px;
        font-size: 15px;
        min-height: 52px;
    }
}

/* 二维码样式 */
.qr-section {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 2px solid #eee;
    text-align: center;
}

.qr-section img {
    width: 250px;
    height: 250px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* 响应式设计 */
@media (max-width: 600px) {
    .qr-section img {
        width: 220px;
        height: 220px;
    }
}