/**
 * 主样式文件 - 设计系统
 * 包含：CSS 变量、重置样式、通用样式、导航栏、侧边栏、页脚等
 */

/* ========================================
   1. CSS 变量（设计系统）
   ======================================== */
:root {
    /* 主色调 */
    --color-primary: #913500;
    --color-primary-light: #b34a1a;
    --color-primary-dark: #6e2800;

    /* 辅助色 */
    --color-secondary: #1890ff;
    --color-success: #52c41a;
    --color-warning: #fa8c16;
    --color-danger: #f5222d;
    --color-info: #722ed1;

    /* 中性色 */
    --color-text: #333333;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;
    --color-border: #e8e8e8;
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f5;
    --color-bg-tertiary: #fafafa;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);

    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;

    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 13px;
    --font-size-md: 14px;
    --font-size-lg: 16px;
    --font-size-xl: 18px;
    --font-size-xxl: 24px;
    --font-size-xxxl: 32px;

    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 布局 */
    --header-height: 60px;
    --sidebar-width: 320px;
    --sidebar-collapsed-width: 0;
    --footer-bg: #f8f8f8;
    --footer-text: #666666;
}

/* 暗色主题变量 */
[data-theme="dark"] {
    --color-text: #e0e0e0;
    --color-text-secondary: #b0b0b0;
    --color-text-muted: #808080;
    --color-border: #404040;
    --color-bg: #1a1a1a;
    --color-bg-secondary: #2a2a2a;
    --color-bg-tertiary: #333333;
    --footer-bg: #2a2a2a;
    --footer-text: #b0b0b0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

/* ========================================
   2. 重置样式
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

a:hover {
    color: var(--color-primary-light);
}

img {
    max-width: 100%;
    height: auto;
}

ul, ol {
    list-style: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    font-size: inherit;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ========================================
   3. 通用样式类
   ======================================== */

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
}

.container-narrow {
    max-width: 960px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-md);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-light);
    border-color: var(--color-primary-light);
    color: #ffffff;
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-sm {
    padding: 4px 12px;
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: 12px 24px;
    font-size: var(--font-size-lg);
}

/* 卡片 */
.card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* ========================================
   SVG 图标系统
   ======================================== */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    vertical-align: middle;
    fill: currentColor;
    stroke: currentColor;
    stroke-width: 0;
}

.icon-sm {
    width: 14px;
    height: 14px;
    font-size: 14px;
}

.icon-md {
    width: 18px;
    height: 18px;
    font-size: 18px;
}

.icon-lg {
    width: 28px;
    height: 28px;
    font-size: 28px;
}

.icon-xl {
    width: 48px;
    height: 48px;
    font-size: 48px;
}

/* 图标按钮 */
.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background-color: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

.btn-icon:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-primary);
}

/* 统计信息行 */
.stats {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.stat-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.stat-item .icon {
    opacity: 0.7;
}

/* 空状态 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xxl) 0;
    color: var(--color-text-muted);
}

.empty-state .icon {
    margin-bottom: var(--spacing-md);
    opacity: 0.4;
}

.empty-text {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

/* 网格布局 */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Flex 布局 */
.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-column {
    display: flex;
    flex-direction: column;
}

/* 文本对齐 */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

/* 间距工具 */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

/* 显示/隐藏 */
.hidden { display: none !important; }
.visible { display: block !important; }

/* ========================================
   4. 导航栏样式
   ======================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-normal), box-shadow var(--transition-normal);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--spacing-md);
    max-width: 1400px;
    margin: 0 auto;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.navbar-brand:hover {
    color: var(--color-primary-light);
}

.site-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-link {
    padding: 8px 12px;
    border-radius: var(--radius-md);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-secondary);
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 500;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 12px;
    right: 12px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 1px;
}

/* 右侧工具栏 */
.navbar-tools {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.tool-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    background: none;
    border: none;
    cursor: pointer;
}

.tool-btn:hover {
    color: var(--color-primary);
    background-color: var(--color-bg-secondary);
}

/* 用户菜单 */
.user-menu {
    position: relative;
}

.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 4px 8px;
    border-radius: var(--radius-md);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.user-menu-trigger:hover {
    background-color: var(--color-bg-secondary);
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs) 0;
    display: none;
    z-index: 1001;
}

.user-menu-dropdown.show {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 8px 16px;
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-md);
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-primary);
}

.dropdown-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-xs) 0;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
}

/* 移动端搜索栏 */
.mobile-search {
    display: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.mobile-search.show {
    display: block;
}

.search-form {
    display: flex;
    gap: var(--spacing-sm);
}

.search-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: var(--font-size-md);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.search-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background-color: var(--color-primary);
    color: #ffffff;
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.search-btn:hover {
    background-color: var(--color-primary-light);
}

/* ========================================
   5. 侧边栏样式
   ======================================== */
.sidebar {
    position: fixed;
    top: 0;
    right: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: #1e1e2e;
    color: #e0e0e0;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.3);
    z-index: 2000;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar.show {
    transform: translateX(0);
}

.sidebar.collapsed {
    width: 48px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    min-height: 60px;
}

.sidebar-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: #ffffff;
    margin: 0;
}

.sidebar-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    color: #e0e0e0;
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-close:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.sidebar-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #999999;
    font-size: var(--font-size-md);
}

/* 侧边栏拖动调整大小 */
.sidebar-resizer {
    position: absolute;
    top: 0;
    left: -4px;
    width: 8px;
    height: 100%;
    cursor: col-resize;
    z-index: 2001;
}

.sidebar-resizer:hover,
.sidebar-resizer.dragging {
    background-color: var(--color-primary);
    opacity: 0.5;
}

/* ========================================
   6. 页脚样式
   ======================================== */
.footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: var(--spacing-xxl) 0 var(--spacing-md);
    margin-top: auto;
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.footer-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--footer-text);
    text-decoration: none;
    font-size: var(--font-size-md);
    transition: color var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-bg-secondary);
    color: var(--footer-text);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background-color: var(--color-primary);
    color: #ffffff;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.footer-icp {
    margin-top: var(--spacing-xs);
}

.footer-icp a {
    color: var(--color-text-muted);
    text-decoration: none;
}

.footer-icp a:hover {
    color: var(--color-primary);
}

/* ========================================
   7. 返回顶部按钮
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #ffffff;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: var(--color-primary-light);
    transform: translateY(-2px);
}

/* ========================================
   8. 主内容区
   ======================================== */
.main-content {
    flex: 1;
    padding: var(--spacing-md) 0;
    min-height: calc(100vh - var(--header-height) - 200px);
}

/* ========================================
   9. 响应式样式（移动端）
   ======================================== */
@media (max-width: 768px) {
    .navbar-nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        flex-direction: column;
        padding: var(--spacing-sm) 0;
    }

    .navbar-nav.show {
        display: flex;
    }

    .nav-link {
        padding: 12px 16px;
        border-radius: 0;
    }

    .nav-link.active::after {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .user-name {
        display: none;
    }

    .footer-row {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .sidebar {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .footer-row {
        grid-template-columns: 1fr;
    }

    .site-name {
        font-size: var(--font-size-md);
    }
}