/* ============================================
   内测侠 - 全局样式表（逐像素对齐原站 neicexia.com）
   版本：3.0
   ============================================ */

/* ==========================================
   1. CSS 变量定义
   ========================================== */

:root {
    --primary: #428BCA;
    --primary-hover: #2a6496;
    --sidebar-bg: #03A9F4;
    --sidebar-width: 197px;
    --sidebar-text: #333333;
    --bg-body: #3091A9;
    --bg-white: #FFFFFF;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #808080;
    --link-color: #428BCA;
    --link-hover: #2a6496;
    --section-title-color: #5652CA;
    --highlight-red: #CF1322;
    --menu-parent-bg: #F1F1F1;
    --border-light: #D3D3D3;
    --transition: all 0.2s ease;
}

/* ==========================================
   2. 全局重置
   ========================================== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    font-size: 16px;
    line-height: 1.8;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

a:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

/* ==========================================
   3. 整体布局
   ========================================== */

.app-layout {
    display: flex;
    min-height: 100vh;
}

/* ==========================================
   4. 侧边栏 — 亮蓝 #03A9F4，宽 197px
   ========================================== */

.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    overflow-y: auto;
    overflow-x: hidden;
}

/* 白色菜单区，margin: 10px */
.sidebar-menu-area {
    background: var(--bg-white);
    margin: 10px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* ==========================================
   5. 登录入口 — 纯文字蓝字链接
   ========================================== */

.sidebar-login-area {
    padding: 10px 5px;
    text-align: center;
}

.sidebar-login-link {
    font-size: 14px;
    color: var(--link-color);
}

.sidebar-login-link:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* 登录后用户信息 */
.sidebar-user-area {
    padding: 10px 5px;
    text-align: center;
    font-size: 14px;
    color: var(--text-primary);
}

.sidebar-user-area .logout-link {
    font-size: 14px;
    color: var(--link-color);
    margin-left: 8px;
}

.sidebar-user-area .logout-link:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* ==========================================
   6. 菜单导航
   ========================================== */

.sidebar-nav {
    flex: 1;
}

.nav-tree {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* 父级菜单：16px, #333, 背景 #F1F1F1, padding 10px 5px */
.nav-tree-parent {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 5px;
    color: var(--text-primary);
    font-size: 16px;
    background: var(--menu-parent-bg);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.nav-tree-parent:hover {
    color: var(--link-color);
}

/* 展开箭头 ▶ / ▼，12px */
.nav-arrow {
    font-size: 12px;
    color: var(--text-primary);
    flex-shrink: 0;
}

/* 子级菜单容器，默认隐藏 */
.nav-tree-children {
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
}

.nav-tree-children.open {
    display: block;
}

/* 子级菜单项：12px, #333, padding: 8px 5px 8px 15px */
.nav-tree-child {
    display: block;
    padding: 8px 5px 8px 15px;
    color: var(--text-primary);
    font-size: 12px;
    line-height: 1.5;
    transition: var(--transition);
}

.nav-tree-child:hover {
    color: var(--link-color);
    text-decoration: none;
}

/* ==========================================
   7. 主内容区
   ========================================== */

.main-area {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg-body);
}

.content-wrapper {
    padding: 0;
    background: var(--bg-white);
    min-height: calc(100vh);
    margin: 0;
}

/* ==========================================
   8. 标题
   ========================================== */

/* 大标题：18px, 400, #000, 居中 */
.page-title {
    font-size: 18px;
    font-weight: 400;
    color: #000000;
    text-align: center;
    margin-bottom: 16px;
    line-height: 1.4;
}

/* Section 标题（产品特色 / 下载 / 关于我们）：26px, 700, #5652CA */
.section-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--section-title-color);
    margin-bottom: 16px;
    line-height: 1.4;
}

/* ==========================================
   9. 正文与列表
   ========================================== */

.intro-text {
    font-size: 16px;
    color: var(--text-primary);
    line-height: 1.8;
    margin-bottom: 16px;
}

/* 红色高亮文字 */
.highlight-red {
    color: var(--highlight-red);
    font-weight: bold;
}

/* 教程链接 */
.highlight-link {
    color: var(--link-color);
    font-size: 16px;
}

.highlight-link:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

/* 产品特色列表 — 默认实心圆点 */
.feature-list {
    padding-left: 20px;
    margin: 0;
    list-style-type: disc;
}

.feature-list li {
    font-size: 18px;
    color: var(--text-primary);
    line-height: 1.8;
    padding: 5px 0;
}

/* ==========================================
   10. 下载区域 — 纯文本列表
   ========================================== */

.download-label {
    font-size: 16px;
    color: var(--text-primary);
}

.download-link {
    font-size: 16px;
    color: var(--link-color);
}

.download-link:hover {
    color: var(--link-hover);
    text-decoration: underline;
}

.download-text {
    font-size: 16px;
    color: var(--text-primary);
}

/* ==========================================
   11. 关于我们
   ========================================== */

.about-text {
    font-size: 16px;
    color: var(--text-primary);
    line-height: 1.8;
}

/* ==========================================
   12. 页脚
   ========================================== */

.app_bottom {
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    padding: 16px 0;
    line-height: 1.8;
}

/* ==========================================
   13. 通用 Section
   ========================================== */

.section {
    margin-bottom: 24px;
}

/* ==========================================
   14. Flash 消息
   ========================================== */

.flash-messages {
    padding: 8px 16px 0;
    margin-bottom: 16px;
}

.flash-message {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-radius: 4px;
    margin-bottom: 8px;
    font-size: 14px;
}

.flash-success { background: #f6ffed; border: 1px solid #b7eb8f; color: #389e0d; }
.flash-danger  { background: #fff2f0; border: 1px solid #ffccc7; color: #cf1322; }
.flash-info    { background: #e6f7ff; border: 1px solid #91d5ff; color: #096dd9; }
.flash-warning { background: #fffbe6; border: 1px solid #ffe58f; color: #d48806; }

.flash-close {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: inherit;
    opacity: 0.6;
    padding: 0 4px;
    line-height: 1;
}

.flash-close:hover { opacity: 1; }

/* ==========================================
   15. 认证页面
   ========================================== */

.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 24px;
    background: var(--bg-body);
}

.auth-card {
    width: 100%;
    max-width: 400px;
    background: var(--bg-white);
    border-radius: 4px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    padding: 32px;
}

.auth-header {
    text-align: center;
    margin-bottom: 28px;
}

.auth-header h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.auth-subtitle {
    font-size: 13px;
    color: var(--text-muted);
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-secondary);
}

.auth-footer a { font-weight: 500; }

/* ==========================================
   16. 表单
   ========================================== */

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

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-input {
    display: block;
    width: 100%;
    max-width: 480px;
    padding: 8px 12px;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-white);
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    outline: none;
    line-height: 1.5;
    font-family: inherit;
    transition: var(--transition);
}

.form-input:focus {
    border-color: var(--link-color);
    box-shadow: 0 0 0 2px rgba(66,139,202,0.2);
}

.auth-form .form-input { max-width: 100%; }

/* ==========================================
   17. 按钮
   ========================================== */

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 20px;
    font-size: 14px;
    font-weight: 500;
    color: #fff;
    background: var(--link-color);
    border: 1px solid var(--link-color);
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    line-height: 1.5;
}

.btn-primary:hover {
    background: var(--link-hover);
    border-color: var(--link-hover);
    color: #fff;
    text-decoration: none;
}

.btn-primary:disabled {
    background: #91a8c0;
    border-color: #91a8c0;
    cursor: not-allowed;
}

.btn-block { display: flex; width: 100%; justify-content: center; }

/* ==========================================
   18. 移动端按钮与遮罩
   ========================================== */

.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    background: var(--link-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 8px 12px;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    transition: var(--transition);
}

.mobile-menu-btn:hover { background: var(--link-hover); }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 99;
}

/* ==========================================
   19. 响应式
   ========================================== */

/* 1200px 以下宽度不变 */
@media (max-width: 1200px) {}

/* 768px 以下隐藏侧边栏 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: 2px 0 12px rgba(0,0,0,0.2);
    }

    .main-area {
        margin-left: 0;
        padding-top: 48px;
    }

    .mobile-menu-btn { display: block; }
    .sidebar-overlay.visible { display: block; }

    .page-title { font-size: 16px; }
    .section-title { font-size: 22px; }
    .feature-list li { font-size: 16px; }
}

@media (max-width: 480px) {
    .auth-card { padding: 24px 16px; }
}

/* ==========================================
   20. 工具类
   ========================================== */

.d-none { display: none !important; }
.text-center { text-align: center; }
.mt-3 { margin-top: 16px; }
.mt-4 { margin-top: 24px; }
.mb-3 { margin-bottom: 16px; }
.mb-4 { margin-bottom: 24px; }