/* ============================================
   AI学术写作系统 - 学术风格设计系统 v2.0
   ============================================
   
   设计理念：
   - 学术权威性：深蓝色主色调，体现学术严谨性
   - 专业规范：符合学术出版行业标准
   - 清晰层级：信息架构清晰，操作流程便捷
   - 无障碍支持：符合WCAG 2.1 AA级标准
   
   遵循规范：
   - COPE规范（学术出版伦理）
   - 中国科协《科技期刊出版伦理规范》
   - GB/T 7714-2015 参考文献著录规则
   
   ============================================ */

/* ============================================
   1. 学术设计令牌 (Academic Design Tokens)
   ============================================ */

:root {
    /* 学术权威蓝 - 主色系 */
    --academic-primary: #1a365d;
    --academic-primary-50: #eff6ff;
    --academic-primary-100: #dbeafe;
    --academic-primary-200: #bfdbfe;
    --academic-primary-300: #93c5fd;
    --academic-primary-400: #60a5fa;
    --academic-primary-500: #3b82f6;
    --academic-primary-600: #2563eb;
    --academic-primary-700: #1d4ed8;
    --academic-primary-800: #1e40af;
    --academic-primary-900: #1e3a8a;
    --academic-primary-950: #172554;
    
    /* 学术辅助色 */
    --academic-secondary: #475569;
    --academic-secondary-50: #f8fafc;
    --academic-secondary-100: #f1f5f9;
    --academic-secondary-200: #e2e8f0;
    --academic-secondary-300: #cbd5e1;
    --academic-secondary-400: #94a3b8;
    --academic-secondary-500: #64748b;
    --academic-secondary-600: #475569;
    --academic-secondary-700: #334155;
    --academic-secondary-800: #1e293b;
    --academic-secondary-900: #0f172a;
    
    /* 护眼白 - 背景色系 */
    --academic-bg: #fafbfc;
    --academic-bg-secondary: #f1f5f9;
    --academic-surface: #ffffff;
    --academic-surface-elevated: #ffffff;
    --academic-surface-overlay: #ffffff;
    
    /* 学术功能色 */
    --academic-success: #059669;
    --academic-success-50: #ecfdf5;
    --academic-success-100: #d1fae5;
    --academic-success-500: #10b981;
    --academic-success-600: #059669;
    --academic-success-700: #047857;
    
    --academic-warning: #d97706;
    --academic-warning-50: #fffbeb;
    --academic-warning-100: #fef3c7;
    --academic-warning-500: #f59e0b;
    --academic-warning-600: #d97706;
    --academic-warning-700: #b45309;
    
    --academic-error: #dc2626;
    --academic-error-50: #fef2f2;
    --academic-error-100: #fee2e2;
    --academic-error-500: #ef4444;
    --academic-error-600: #dc2626;
    --academic-error-700: #b91c1c;
    
    --academic-info: #0284c7;
    --academic-info-50: #f0f9ff;
    --academic-info-100: #e0f2fe;
    --academic-info-500: #0ea5e9;
    --academic-info-600: #0284c7;
    --academic-info-700: #0369a1;
    
    /* 文字色阶 */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-disabled: #cbd5e1;
    --text-inverse: #ffffff;
    --text-link: #1d4ed8;
    --text-link-hover: #1e40af;
    
    /* 边框色 */
    --border-light: #e2e8f0;
    --border-default: #cbd5e1;
    --border-dark: #94a3b8;
    --border-focus: #3b82f6;
    
    /* 字体家族 */
    --font-chinese: 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei', 'PingFang SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'Source Han Serif CN', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    --font-display: 'Noto Sans SC', 'Source Han Sans SC', sans-serif;
    --font-sans: var(--font-chinese);
    
    /* 字号系统 (学术写作标准: 12-14px正文) */
    --text-xs: 0.75rem;
    --text-sm: 0.8125rem;
    --text-base: 0.875rem;
    --text-lg: 1rem;
    --text-xl: 1.125rem;
    --text-2xl: 1.25rem;
    --text-3xl: 1.5rem;
    --text-4xl: 1.75rem;
    --text-5xl: 2rem;
    --text-6xl: 2.5rem;
    
    /* 字重 */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* 行高 (学术写作标准: 1.8倍) */
    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.4;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;
    --leading-loose: 2.0;
    
    /* 间距系统 */
    --spacing-0: 0;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    
    /* 圆角 */
    --radius-none: 0;
    --radius-sm: 0.125rem;
    --radius-md: 0.25rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    
    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-index层级 */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
    
    /* 布局尺寸 */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 72px;
    --header-height: 64px;
    --footer-height: 48px;
    --content-max-width: 1280px;
    --editor-max-width: 900px;
}

/* ============================================
   2. 全局重置与基础样式
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-chinese);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    color: var(--text-primary);
    background-color: var(--academic-bg);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================
   3. 排版系统
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    color: var(--text-primary);
    margin: 0;
}

h1 { font-size: var(--text-5xl); letter-spacing: -0.025em; }
h2 { font-size: var(--text-4xl); letter-spacing: -0.02em; }
h3 { font-size: var(--text-3xl); letter-spacing: -0.015em; }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
    margin: 0;
    line-height: var(--leading-relaxed);
}

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

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

strong, b {
    font-weight: var(--font-semibold);
}

small {
    font-size: var(--text-sm);
}

/* ============================================
   4. 学术布局系统
   ============================================ */

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

.academic-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--academic-surface);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    z-index: var(--z-fixed);
    transition: width var(--transition-base), transform var(--transition-base);
}

.academic-sidebar.collapsed {
    width: var(--sidebar-collapsed-width);
}

.academic-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-base);
}

/* 支持 .content-area 作为备选 */
.content-area {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-base);
    width: calc(100% - var(--sidebar-width));
    max-width: none;
}

.academic-sidebar.collapsed ~ .content-area {
    margin-left: var(--sidebar-collapsed-width);
    width: calc(100% - var(--sidebar-collapsed-width));
}

.academic-sidebar.collapsed + .academic-main {
    margin-left: var(--sidebar-collapsed-width);
    width: calc(100% - var(--sidebar-collapsed-width));
}

/* 侧边栏切换按钮 */
.sidebar-toggle {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-left: auto;
}

.sidebar-toggle:hover {
    background: var(--academic-bg-secondary);
    color: var(--text-primary);
}

/* 新的侧边栏切换按钮样式 - 位于品牌区域下方 */
.sidebar-toggle-btn {
    width: 100%;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--academic-bg-secondary);
    border: none;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--text-sm);
}

.sidebar-toggle-btn:hover {
    background: var(--academic-primary-50);
    color: var(--academic-primary-600);
}

/* 收缩状态下按钮样式 */
.academic-sidebar.collapsed .sidebar-toggle-btn {
    justify-content: center;
    padding: 0;
}

.academic-sidebar.collapsed .sidebar-toggle-btn i {
    transform: rotate(180deg);
}

.academic-header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--academic-surface);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-6);
    z-index: var(--z-sticky);
}

.academic-content {
    flex: 1;
    padding: var(--spacing-6);
    max-width: var(--content-max-width);
    margin: 0 auto;
    width: 100%;
}

.academic-footer {
    height: var(--footer-height);
    background: var(--academic-surface);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-6);
    font-size: var(--text-sm);
    color: var(--text-tertiary);
}

/* ============================================
   5. 侧边栏组件
   ============================================ */

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-5) var(--spacing-6);
    border-bottom: 1px solid var(--border-light);
    height: var(--header-height);
}

.sidebar-brand-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--academic-primary-700), var(--academic-primary-900));
    border-radius: var(--radius-xl);
    color: var(--text-inverse);
    font-size: var(--text-xl);
    flex-shrink: 0;
}

.sidebar-brand-text {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-brand-title {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    white-space: nowrap;
}

.sidebar-brand-subtitle {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    white-space: nowrap;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-4) 0;
}

.sidebar-nav-section {
    padding: 0 var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.sidebar-nav-title {
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-2) var(--spacing-3);
    margin-bottom: var(--spacing-1);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    text-decoration: none;
    transition: all var(--transition-fast);
    margin-bottom: var(--spacing-1);
}

.sidebar-nav-item:hover {
    background: var(--academic-bg-secondary);
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar-nav-item.active {
    background: var(--academic-primary-50);
    color: var(--academic-primary-700);
}

.sidebar-nav-item i {
    width: 20px;
    text-align: center;
    font-size: var(--text-base);
}

.sidebar-user {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.sidebar-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--academic-primary-500), var(--academic-primary-700));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    flex-shrink: 0;
}

.sidebar-user-info {
    flex: 1;
    overflow: hidden;
}

/* 侧边栏收缩状态 */
.academic-sidebar.collapsed .sidebar-brand-text,
.academic-sidebar.collapsed .sidebar-nav-title,
.academic-sidebar.collapsed .sidebar-nav-item span,
.academic-sidebar.collapsed .sidebar-user-info {
    display: none;
}

/* 收缩状态下显示工具提示 */
.academic-sidebar.collapsed .sidebar-nav-item {
    position: relative;
}

.academic-sidebar.collapsed .sidebar-nav-item::after {
    content: attr(data-title);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    background: var(--text-primary);
    color: var(--text-inverse);
    padding: var(--spacing-2) var(--spacing-3);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
    margin-left: var(--spacing-2);
    box-shadow: var(--shadow-lg);
}

.academic-sidebar.collapsed .sidebar-nav-item:hover::after {
    opacity: 1;
    visibility: visible;
}

.academic-sidebar.collapsed .sidebar-brand {
    justify-content: center;
    padding: var(--spacing-5) var(--spacing-3);
}

.academic-sidebar.collapsed .sidebar-nav-item {
    justify-content: center;
    padding: var(--spacing-3);
    cursor: pointer;
}

.academic-sidebar.collapsed .sidebar-nav-item i {
    width: 24px;
    font-size: var(--text-lg);
}

.academic-sidebar.collapsed .sidebar-user {
    justify-content: center;
    padding: var(--spacing-4) var(--spacing-3);
}

.academic-sidebar.collapsed .sidebar-toggle {
    margin-left: 0;
}

.sidebar-user-name {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-role {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

/* 侧边栏退出按钮 */
.sidebar-logout-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.sidebar-logout-btn:hover {
    background: var(--academic-error-50);
    color: var(--academic-error-600);
}

.sidebar-logout-btn:active {
    transform: scale(0.95);
}

/* 收缩状态下隐藏退出按钮文字 */
.academic-sidebar.collapsed .sidebar-logout-btn {
    margin-left: 0;
}

/* ============================================
   6. 按钮组件
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-family: var(--font-chinese);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgb(59 130 246 / 0.3);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    color: var(--text-inverse);
    background: var(--academic-primary-600);
    border-color: var(--academic-primary-600);
}

.btn-primary:hover {
    background: var(--academic-primary-700);
    border-color: var(--academic-primary-700);
}

.btn-primary:active {
    background: var(--academic-primary-800);
    border-color: var(--academic-primary-800);
}

.btn-secondary {
    color: var(--text-primary);
    background: var(--academic-surface);
    border-color: var(--border-default);
}

.btn-secondary:hover {
    background: var(--academic-bg-secondary);
    border-color: var(--border-dark);
}

.btn-success {
    color: var(--text-inverse);
    background: var(--academic-success-600);
    border-color: var(--academic-success-600);
}

.btn-success:hover {
    background: var(--academic-success-700);
    border-color: var(--academic-success-700);
}

.btn-warning {
    color: var(--text-inverse);
    background: var(--academic-warning-600);
    border-color: var(--academic-warning-600);
}

.btn-warning:hover {
    background: var(--academic-warning-700);
    border-color: var(--academic-warning-700);
}

.btn-danger {
    color: var(--text-inverse);
    background: var(--academic-error-600);
    border-color: var(--academic-error-600);
}

.btn-danger:hover {
    background: var(--academic-error-700);
    border-color: var(--academic-error-700);
}

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

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

.btn-link {
    color: var(--text-link);
    background: transparent;
    border-color: transparent;
    padding: 0;
}

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

.btn-sm {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--text-base);
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
}

.btn-icon.btn-sm {
    width: 28px;
    height: 28px;
}

.btn-icon.btn-lg {
    width: 44px;
    height: 44px;
}

/* ============================================
   7. 卡片组件
   ============================================ */

.card {
    background: var(--academic-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) var(--spacing-6);
    border-bottom: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

.card-header h1,
.card-header h2,
.card-header h3,
.card-header h4,
.card-header h5,
.card-header h6 {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.card-body {
    padding: var(--spacing-6);
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

/* ============================================
   8. 表单组件
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-5);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.form-label i {
    margin-right: var(--spacing-2);
    color: var(--text-tertiary);
}

.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-family: var(--font-chinese);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--academic-surface);
    background-clip: padding-box;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    color: var(--text-primary);
    background-color: var(--academic-surface);
    border-color: var(--border-focus);
    outline: 0;
    box-shadow: 0 0 0 3px rgb(59 130 246 / 0.15);
}

.form-control::placeholder {
    color: var(--text-tertiary);
    opacity: 1;
}

.form-control:disabled {
    background-color: var(--academic-bg-secondary);
    cursor: not-allowed;
}

.form-select {
    display: block;
    width: 100%;
    padding: var(--spacing-3) var(--spacing-10) var(--spacing-3) var(--spacing-4);
    font-family: var(--font-chinese);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--academic-surface);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--spacing-3) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    appearance: none;
    cursor: pointer;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-select:focus {
    border-color: var(--border-focus);
    outline: 0;
    box-shadow: 0 0 0 3px rgb(59 130 246 / 0.15);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
}

.form-hint {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-top: var(--spacing-1);
}

.form-error {
    font-size: var(--text-sm);
    color: var(--academic-error-600);
    margin-top: var(--spacing-1);
}

/* ============================================
   9. 标签组件
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    line-height: 1;
    border-radius: var(--radius-md);
    white-space: nowrap;
}

.badge-primary {
    background: var(--academic-primary-100);
    color: var(--academic-primary-700);
}

.badge-secondary {
    background: var(--academic-secondary-100);
    color: var(--academic-secondary-700);
}

.badge-success {
    background: var(--academic-success-100);
    color: var(--academic-success-700);
}

.badge-warning {
    background: var(--academic-warning-100);
    color: var(--academic-warning-700);
}

.badge-danger {
    background: var(--academic-error-100);
    color: var(--academic-error-700);
}

.badge-info {
    background: var(--academic-info-100);
    color: var(--academic-info-700);
}

/* ============================================
   10. 表格组件
   ============================================ */

.table-container {
    overflow-x: auto;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
}

.table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--text-sm);
}

.table th {
    padding: var(--spacing-3) var(--spacing-4);
    text-align: left;
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    background: var(--academic-bg-secondary);
    border-bottom: 1px solid var(--border-light);
    white-space: nowrap;
}

.table td {
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

.table tbody tr:hover {
    background: var(--academic-bg-secondary);
}

/* ============================================
   11. 模态框组件
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    max-width: none !important;
    max-height: none !important;
    overflow: visible !important;
    display: none !important;
    flex-direction: column;
    padding: 0 !important;
    margin: 0 !important;
}

.modal.show {
    display: flex !important;
}

/* 覆盖Bootstrap模态框样式 */
.modal.fade {
    display: none !important;
}

.modal.fade.show {
    display: block !important;
}

.modal-backdrop {
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-open .modal {
    overflow-x: hidden;
    overflow-y: auto;
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-sm { width: 400px; }
.modal-md { width: 560px; }
.modal-lg { width: 720px; }
.modal-xl { width: 900px; }

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-5) var(--spacing-6);
    border-bottom: 1px solid var(--border-light);
}

.modal-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.modal-title i {
    color: var(--academic-primary-600);
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--academic-bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-6);
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

/* ============================================
   AI 弹窗优化 (AI Modal Optimization)
   ============================================ */
.modal-ai-compact {
    max-width: 550px !important;
    margin-left: auto !important;
    margin-right: auto !important;
}

.modal-ai-compact .modal-content {
    border: none !important;
    border-radius: 16px !important;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2) !important;
    background: #fff !important;
    margin: 0 !important;
}

.modal-ai-compact .modal-header {
    border-bottom: none !important;
    padding: 1.5rem 1.5rem 0.5rem !important;
}

.modal-ai-compact .modal-body {
    padding: 0.75rem 1.5rem !important;
}

.modal-ai-compact .modal-footer {
    border-top: none !important;
    background: transparent !important;
    padding: 0.5rem 1.5rem 1.5rem !important;
}

.modal-ai-compact .form-group, .modal-ai-compact .mb-3 {
    margin-bottom: 1rem !important;
}

.modal-ai-compact .form-label {
    font-size: 0.85rem !important;
    color: var(--text-secondary) !important;
    margin-bottom: 0.35rem !important;
}

.modal-ai-compact .form-control, .modal-ai-compact .form-select {
    border-radius: 8px !important;
    border: 1px solid var(--border-light) !important;
    padding: 0.6rem 0.8rem !important;
    font-size: 0.95rem !important;
    transition: all 0.2s ease !important;
}

.modal-ai-compact .form-control:focus, .modal-ai-compact .form-select:focus {
    border-color: var(--academic-primary-500) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1) !important;
}

.modal-ai-compact .btn {
    padding: 0.6rem 1.5rem !important;
    font-weight: 600 !important;
    border-radius: 8px !important;
}

/* ============================================
   12. Toast通知组件
   ============================================ */

.toast-container {
    position: fixed;
    top: var(--spacing-6);
    right: var(--spacing-6);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    z-index: var(--z-toast);
    max-width: 400px;
}

.toast {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-5);
    background: var(--academic-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--academic-primary-600);
    animation: toastSlideIn var(--transition-base) ease-out;
}

.toast.toast-success { border-left-color: var(--academic-success-600); }
.toast.toast-warning { border-left-color: var(--academic-warning-600); }
.toast.toast-danger { border-left-color: var(--academic-error-600); }
.toast.toast-info { border-left-color: var(--academic-info-600); }

.toast-icon {
    font-size: var(--text-lg);
    flex-shrink: 0;
}

.toast-success .toast-icon { color: var(--academic-success-600); }
.toast-warning .toast-icon { color: var(--academic-warning-600); }
.toast-danger .toast-icon { color: var(--academic-error-600); }
.toast-info .toast-icon { color: var(--academic-info-600); }

.toast-content {
    flex: 1;
}

.toast-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-1);
}

.toast-message {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================================
   13. 进度条组件
   ============================================ */

.progress {
    height: 8px;
    background: var(--academic-bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--academic-primary-600);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-bar-success { background: var(--academic-success-600); }
.progress-bar-warning { background: var(--academic-warning-600); }
.progress-bar-danger { background: var(--academic-error-600); }

/* ============================================
   14. 空状态组件
   ============================================ */

.empty-state {
    text-align: center;
    padding: var(--spacing-12) var(--spacing-6);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-6);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--academic-bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-tertiary);
    font-size: var(--text-3xl);
}

.empty-state-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.empty-state-description {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-bottom: var(--spacing-6);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   15. 加载状态组件
   ============================================ */

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-light);
    border-top-color: var(--academic-primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-spinner-sm {
    width: 16px;
    height: 16px;
}

.loading-spinner-lg {
    width: 32px;
    height: 32px;
    border-width: 3px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgb(255 255 255 / 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
}

/* ============================================
   16. 工具类
   ============================================ */

.text-primary { color: var(--text-primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-tertiary { color: var(--text-tertiary) !important; }
.text-success { color: var(--academic-success-600) !important; }
.text-warning { color: var(--academic-warning-600) !important; }
.text-danger { color: var(--academic-error-600) !important; }
.text-info { color: var(--academic-info-600) !important; }

.bg-primary { background-color: var(--academic-primary-600) !important; }
.bg-secondary { background-color: var(--academic-bg-secondary) !important; }
.bg-success { background-color: var(--academic-success-600) !important; }
.bg-warning { background-color: var(--academic-warning-600) !important; }
.bg-danger { background-color: var(--academic-error-600) !important; }

.rounded-sm { border-radius: var(--radius-sm) !important; }
.rounded-md { border-radius: var(--radius-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-xl { border-radius: var(--radius-xl) !important; }
.rounded-2xl { border-radius: var(--radius-2xl) !important; }
.rounded-full { border-radius: var(--radius-full) !important; }

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }

.hidden { display: none !important; }
.invisible { visibility: hidden !important; }

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   17. 动画效果
   ============================================ */

.fade-in {
    animation: fadeIn var(--transition-base) ease-out;
}

.slide-in {
    animation: slideIn var(--transition-base) ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   18. 响应式设计
   ============================================ */

@media (max-width: 1024px) {
    .academic-sidebar {
        transform: translateX(-100%);
    }
    
    .academic-sidebar.open {
        transform: translateX(0);
    }
    
    .academic-main {
        margin-left: 0;
    }
    
    .academic-content {
        padding: var(--spacing-4);
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }
    
    .academic-header {
        padding: 0 var(--spacing-4);
    }
    
    .academic-content {
        padding: var(--spacing-3);
    }
    
    h1 { font-size: var(--text-3xl); }
    h2 { font-size: var(--text-2xl); }
    h3 { font-size: var(--text-xl); }
    
    /* 表单响应式 */
    .form-row {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .form-row .form-group {
        min-width: 100%;
    }
    
    /* 卡片网格响应式 */
    .stats-section {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-4);
    }
    
    /* 按钮组响应式 */
    .form-actions {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .form-actions .btn {
        width: 100%;
        justify-content: center;
    }
    
    /* 表格响应式 */
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* 文档类型选择网格 */
    .doc-type-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .toast-container {
        left: var(--spacing-3);
        right: var(--spacing-3);
        max-width: none;
    }
    
    .modal {
        margin: var(--spacing-3);
        max-width: calc(100vw - var(--spacing-6));
    }
    
    /* 统计卡片单列 */
    .stats-section {
        grid-template-columns: 1fr;
    }
    
    /* 文档类型选择单列 */
    .doc-type-grid {
        grid-template-columns: 1fr;
    }
    
    /* 页面标题 */
    .page-header-title {
        font-size: var(--text-2xl);
    }
    
    /* 表单卡片 */
    .form-card {
        border-radius: var(--radius-xl);
    }
    
    .form-card-header {
        padding: var(--spacing-4);
    }
    
    .form-card-body {
        padding: var(--spacing-4);
    }
}

/* ============================================
   19. 安卓设备优化
   ============================================ */

.android-device {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

.android-device .sidebar-nav-item,
.android-device .btn,
.android-device .form-input,
.android-device .form-select,
.android-device .form-textarea {
    -webkit-tap-highlight-color: transparent;
}

.android-device .sidebar-nav-item:active,
.android-device .btn:active {
    transform: scale(0.98);
    transition: transform 0.1s ease;
}

/* 安卓设备触摸反馈 */
.android-device .touchable {
    position: relative;
    overflow: hidden;
}

.android-device .touchable::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.android-device .touchable:active::after {
    width: 200%;
    height: 200%;
}

/* PWA模式优化 */
.pwa-mode .academic-header {
    padding-top: env(safe-area-inset-top);
}

.pwa-mode .academic-sidebar {
    padding-bottom: env(safe-area-inset-bottom);
}

.pwa-mode .form-actions {
    padding-bottom: env(safe-area-inset-bottom);
}

/* 移动端触摸滚动优化 */
@media (pointer: coarse) {
    .sidebar-nav {
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }
    
    .modal-body {
        -webkit-overflow-scrolling: touch;
    }
    
    .table-responsive {
        -webkit-overflow-scrolling: touch;
    }
    
    /* 增大触摸目标 */
    .btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .sidebar-nav-item {
        min-height: 48px;
        padding: var(--spacing-3) var(--spacing-4);
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        min-height: 48px;
        font-size: 16px;
    }
    
    /* 防止iOS缩放 */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="search"],
    textarea,
    select {
        font-size: 16px;
    }
}

/* 横屏模式优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .academic-sidebar {
        width: 60px;
    }
    
    .sidebar-brand-text,
    .sidebar-nav-title,
    .sidebar-nav-item span {
        display: none;
    }
    
    .sidebar-nav-item {
        justify-content: center;
        padding: var(--spacing-3);
    }
    
    .sidebar-nav-item i {
        margin-right: 0;
    }
}

/* ============================================
   20. 打印样式
   ============================================ */

@media print {
    .academic-sidebar,
    .academic-header,
    .academic-footer,
    .btn,
    .modal-overlay {
        display: none !important;
    }

    .academic-main {
        margin-left: 0;
    }

    .academic-content {
        max-width: 100%;
        padding: 0;
    }

    body {
        background: white;
    }
}

/* ============================================
   21. 抽屉导航增强
   ============================================ */

/* 一级导航分组 */
.sidebar-nav-group {
    margin-bottom: var(--spacing-1);
}

/* 一级导航项 (独立导航项) */
.sidebar-nav-item.nav-primary {
    padding: var(--spacing-3) var(--spacing-4);
    font-weight: var(--font-medium);
    margin-bottom: var(--spacing-1);
}

.sidebar-nav-item.nav-primary > i:first-child {
    font-size: var(--text-base);
}

/* 分隔线 */
.sidebar-nav-item.nav-primary + .sidebar-nav-group {
    margin-top: var(--spacing-3);
    padding-top: var(--spacing-2);
    border-top: 1px solid var(--border-light);
}

.sidebar-nav-group:last-child {
    margin-bottom: var(--spacing-3);
    padding-bottom: var(--spacing-2);
    border-bottom: 1px solid var(--border-light);
}

/* 一级导航父级按钮 */
.sidebar-nav-parent {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    border: none;
    border-radius: var(--radius-lg);
    background: transparent;
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    margin-bottom: var(--spacing-1);
}

.sidebar-nav-parent:hover {
    background: var(--academic-bg-secondary);
    color: var(--text-primary);
}

.sidebar-nav-parent > i:first-child {
    width: 20px;
    text-align: center;
    font-size: var(--text-base);
    flex-shrink: 0;
}

.sidebar-nav-parent > span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 箭头图标 */
.sidebar-nav-parent .nav-arrow {
    width: 16px;
    text-align: center;
    font-size: 10px;
    transition: transform var(--transition-fast);
    color: var(--text-tertiary);
}

.sidebar-nav-parent[aria-expanded="true"] .nav-arrow {
    transform: rotate(180deg);
}

/* 展开状态的父级 */
.sidebar-nav-parent[aria-expanded="true"] {
    background: var(--academic-primary-50);
    color: var(--academic-primary-700);
}

.sidebar-nav-parent[aria-expanded="true"] > i:first-child {
    color: var(--academic-primary-600);
}

/* 二级导航子菜单容器 */
.sidebar-nav-children {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-nav-group.expanded .sidebar-nav-children {
    max-height: 500px;
}

/* 二级导航项 */
.sidebar-nav-children .sidebar-nav-item {
    position: relative;
    padding-left: calc(var(--spacing-4) + 20px + var(--spacing-3));
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.sidebar-nav-children .sidebar-nav-item:hover {
    color: var(--text-primary);
}

.sidebar-nav-children .sidebar-nav-item.active {
    background: var(--academic-primary-50);
    color: var(--academic-primary-700);
}

.sidebar-nav-children .sidebar-nav-item.active::before {
    content: '';
    position: absolute;
    left: calc(var(--spacing-4) + 20px + var(--spacing-3) - var(--spacing-2));
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: var(--academic-primary-500);
    border-radius: 2px;
}

/* 当前页面所在组自动展开 */
.sidebar-nav-group.has-active {
    /* 标记有活动项的组 */
}

.sidebar-nav-group.has-active .sidebar-nav-parent {
    background: var(--academic-primary-50);
    color: var(--academic-primary-700);
}

.sidebar-nav-group.has-active .sidebar-nav-parent > i:first-child {
    color: var(--academic-primary-600);
}

/* 子菜单组样式 */
.sidebar-nav-subgroup {
    margin-top: var(--spacing-1);
}

.sidebar-nav-subgroup.is-active > .sidebar-nav-sub-parent {
    background: var(--academic-primary-50);
    color: var(--academic-primary-700);
}

.sidebar-nav-subgroup.is-active > .sidebar-nav-sub-parent > i:first-child {
    color: var(--academic-primary-600);
}

.sidebar-nav-sub-parent {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    width: 100%;
    padding: var(--spacing-2) var(--spacing-4);
    padding-left: var(--spacing-10);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
    position: relative;
    margin-bottom: var(--spacing-1);
}

.sidebar-nav-sub-parent:hover {
    background: var(--academic-bg-secondary);
    color: var(--text-primary);
}

.sidebar-nav-sub-parent > i:first-child {
    width: 18px;
    height: 18px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
    flex-shrink: 0;
}

.sidebar-nav-sub-parent:hover > i:first-child {
    color: var(--academic-primary-500);
}

.sidebar-nav-sub-parent > span {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-nav-sub-parent .nav-arrow {
    font-size: 10px;
    transition: transform var(--transition-fast);
    color: var(--text-tertiary);
    flex-shrink: 0;
    margin-left: auto;
}

.sidebar-nav-sub-parent[aria-expanded="true"] .nav-arrow {
    transform: rotate(180deg);
}

.sidebar-nav-sub-children {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-nav-subgroup.expanded .sidebar-nav-sub-children {
    max-height: 500px;
}

.sidebar-nav-sub-children .sidebar-nav-item {
    padding-left: var(--spacing-12);
    font-size: var(--text-sm);
    gap: var(--spacing-3);
}

.sidebar-nav-subgroup.expanded .sidebar-nav-sub-children .sidebar-nav-item {
    animation: slideInItem 0.25s ease-out forwards;
}

.sidebar-nav-subgroup.expanded .sidebar-nav-sub-children .sidebar-nav-item:nth-child(1) {
    animation-delay: 0.05s;
}

.sidebar-nav-subgroup.expanded .sidebar-nav-sub-children .sidebar-nav-item:nth-child(2) {
    animation-delay: 0.1s;
}

.sidebar-nav-subgroup.expanded .sidebar-nav-sub-children .sidebar-nav-item:nth-child(3) {
    animation-delay: 0.15s;
}

@keyframes slideInItem {
    from {
        transform: translateX(-8px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.sidebar-nav-sub-children .sidebar-nav-item > i:first-child {
    font-size: 14px;
    width: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* 收缩状态下的折叠导航 */
.academic-sidebar.collapsed .sidebar-nav-parent {
    justify-content: center;
    padding: var(--spacing-3);
}

.academic-sidebar.collapsed .sidebar-nav-parent > span,
.academic-sidebar.collapsed .sidebar-nav-parent .nav-arrow {
    display: none;
}

.academic-sidebar.collapsed .sidebar-nav-children {
    display: none;
}

/* 收缩状态下的悬停展开 */
.academic-sidebar.collapsed .sidebar-nav-group {
    position: relative;
}

.academic-sidebar.collapsed .sidebar-nav-group:hover .sidebar-nav-children {
    display: block;
    position: absolute;
    left: 100%;
    top: 0;
    min-width: 200px;
    background: var(--academic-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    padding: var(--spacing-2);
    z-index: var(--z-tooltip);
    max-height: none;
}

.academic-sidebar.collapsed .sidebar-nav-group:hover .sidebar-nav-children .sidebar-nav-item {
    padding-left: var(--spacing-4);
    white-space: nowrap;
}

/* 收缩状态下的子菜单组悬停展开 */
.academic-sidebar.collapsed .sidebar-nav-subgroup {
    position: relative;
}

.academic-sidebar.collapsed .sidebar-nav-sub-parent {
    justify-content: center;
    padding: var(--spacing-3);
}

.academic-sidebar.collapsed .sidebar-nav-sub-parent > span,
.academic-sidebar.collapsed .sidebar-nav-sub-parent .nav-arrow {
    display: none;
}

.academic-sidebar.collapsed .sidebar-nav-sub-children {
    display: none;
}

.academic-sidebar.collapsed .sidebar-nav-subgroup:hover .sidebar-nav-sub-children {
    display: block;
    position: absolute;
    left: 100%;
    top: 0;
    min-width: 200px;
    background: var(--academic-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    padding: var(--spacing-2);
    z-index: var(--z-tooltip);
    max-height: none;
    opacity: 1;
}

.academic-sidebar.collapsed .sidebar-nav-subgroup:hover .sidebar-nav-sub-children .sidebar-nav-item {
    padding-left: var(--spacing-4);
    white-space: nowrap;
}

/* 汉堡菜单按钮动画 */
.mobile-menu-btn {
    position: relative;
    width: 44px;
    height: 44px;
    display: none;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-lg);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: calc(var(--z-fixed) + 1);
}

.mobile-menu-btn:hover {
    background: var(--academic-bg-secondary);
    color: var(--academic-primary-600);
}

.mobile-menu-btn:active {
    transform: scale(0.95);
}

/* 汉堡图标动画 */
.hamburger-icon {
    position: relative;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    left: 0;
    width: 20px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.hamburger-icon::before {
    top: -6px;
}

.hamburger-icon::after {
    bottom: -6px;
}

/* 打开状态下的汉堡图标 */
.mobile-menu-btn.active .hamburger-icon {
    background: transparent;
}

.mobile-menu-btn.active .hamburger-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-btn.active .hamburger-icon::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* 遮罩层增强 */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgb(15 23 42 / 0);
    z-index: calc(var(--z-fixed) - 1);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(0);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
    background: rgb(15 23 42 / 0.5);
    backdrop-filter: blur(4px);
}

/* 抽屉侧边栏增强 */
.academic-sidebar {
    will-change: transform;
}

/* 抽屉关闭按钮 */
.drawer-close-btn {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    width: 36px;
    height: 36px;
    display: none;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--academic-bg-secondary);
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 10;
}

.drawer-close-btn:hover {
    background: var(--academic-error-50);
    color: var(--academic-error-600);
}

.drawer-close-btn:active {
    transform: scale(0.9);
}

/* 抽屉头部增强 */
.sidebar-brand {
    position: relative;
}

/* 移动端抽屉样式 */
@media (max-width: 1024px) {
    .academic-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: none;
    }

    .academic-sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-2xl), 4px 0 24px rgb(0 0 0 / 0.15);
    }

    .academic-sidebar.collapsed {
        transform: translateX(-100%);
        width: var(--sidebar-width);
    }

    /* 移动端显示关闭按钮 */
    .drawer-close-btn {
        display: flex;
    }

    /* 移动端显示汉堡菜单 */
    .mobile-menu-btn {
        display: flex;
    }

    /* 移动端隐藏收缩按钮 */
    .sidebar-toggle-btn {
        display: none;
    }

    /* 移动端侧边栏头部样式 */
    .academic-sidebar .sidebar-brand {
        padding-right: calc(var(--spacing-6) + 36px);
    }

    /* 内容区域全宽 */
    .content-area {
        margin-left: 0;
        width: 100%;
    }
}

/* 平板设备优化 */
@media (min-width: 769px) and (max-width: 1024px) {
    .academic-sidebar {
        width: 280px;
    }
}

/* 小屏幕手机优化 */
@media (max-width: 480px) {
    .academic-sidebar {
        width: calc(100vw - 56px);
        max-width: 300px;
    }

    .mobile-menu-btn {
        width: 40px;
        height: 40px;
    }

    .hamburger-icon,
    .hamburger-icon::before,
    .hamburger-icon::after {
        width: 18px;
    }

    .hamburger-icon::before {
        top: -5px;
    }

    .hamburger-icon::after {
        bottom: -5px;
    }
}

/* 桌面端样式 */
@media (min-width: 1025px) {
    .academic-sidebar {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: none;
    }

    .drawer-close-btn {
        display: none;
    }

    /* 桌面端收缩功能保持 */
    .academic-sidebar.collapsed {
        transform: translateX(0);
        width: var(--sidebar-collapsed-width);
    }
}

/* 抽屉内导航项动画 */
.academic-sidebar .sidebar-nav-item {
    transition: all var(--transition-fast);
}

.academic-sidebar.open .sidebar-nav-item {
    animation: slideInNavItem 0.3s ease-out forwards;
    opacity: 0;
    transform: translateX(-10px);
}

@keyframes slideInNavItem {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 为每个导航项添加延迟 */
.academic-sidebar.open .sidebar-nav-section:nth-child(1) .sidebar-nav-item { animation-delay: 0.05s; }
.academic-sidebar.open .sidebar-nav-section:nth-child(2) .sidebar-nav-item { animation-delay: 0.1s; }
.academic-sidebar.open .sidebar-nav-section:nth-child(3) .sidebar-nav-item { animation-delay: 0.15s; }
.academic-sidebar.open .sidebar-nav-section:nth-child(4) .sidebar-nav-item { animation-delay: 0.2s; }
.academic-sidebar.open .sidebar-nav-section:nth-child(5) .sidebar-nav-item { animation-delay: 0.25s; }
.academic-sidebar.open .sidebar-nav-section:nth-child(6) .sidebar-nav-item { animation-delay: 0.3s; }

/* 触摸滑动提示 */
.swipe-hint {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    width: 24px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgb(0 0 0 / 0.1);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

/* 滚动条美化 - 抽屉内 */
.academic-sidebar .sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.academic-sidebar .sidebar-nav::-webkit-scrollbar-track {
    background: transparent;
}

.academic-sidebar .sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--border-default);
    border-radius: 2px;
}

.academic-sidebar .sidebar-nav::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* 防止抽屉打开时body滚动 */
body.drawer-open {
    overflow: hidden;
    touch-action: none;
}

/* 辅助功能 - 减少动画 */
@media (prefers-reduced-motion: reduce) {
    .academic-sidebar,
    .sidebar-overlay,
    .sidebar-nav-item,
    .hamburger-icon,
    .hamburger-icon::before,
    .hamburger-icon::after,
    .drawer-close-btn,
    .mobile-menu-btn {
        transition: none;
        animation: none;
    }
}

/* ============================================
   20. 深色模式支持
   ============================================ */

@media (prefers-color-scheme: dark) {
    :root {
        --academic-bg: #0f172a;
        --academic-bg-secondary: #1e293b;
        --academic-surface: #1e293b;
        --academic-surface-elevated: #334155;
        
        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;
        --text-tertiary: #64748b;
        
        --border-light: #334155;
        --border-default: #475569;
    }
}

.dark-mode {
    --academic-bg: #0f172a;
    --academic-bg-secondary: #1e293b;
    --academic-surface: #1e293b;
    --academic-surface-elevated: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    
    --border-light: #334155;
    --border-default: #475569;
}

/* ============================================
   21. 无障碍辅助
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (prefers-contrast: high) {
    :root {
        --academic-primary: #000000;
        --border-default: #000000;
        --border-light: #000000;
    }
    
    .btn {
        border-width: 2px;
    }
    
    .card {
        border-width: 2px;
    }
}

:focus-visible {
    outline: 2px solid var(--academic-primary-600);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    padding: var(--spacing-2) var(--spacing-4);
    background: var(--academic-primary-600);
    color: var(--text-inverse);
    z-index: var(--z-tooltip);
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* ============================================
   22. 数据可视化图表组件
   ============================================ */

/* 图表卡片容器 */
.chart-card {
    background: var(--academic-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.chart-card:hover {
    border-color: var(--academic-primary-200);
    box-shadow: var(--shadow-md);
}

.chart-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

.chart-card-title {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.chart-card-title i {
    color: var(--academic-primary-600);
    font-size: var(--text-base);
}

.chart-card-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* 时间范围选择器 */
.time-range-selector {
    display: flex;
    background: var(--academic-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 2px;
}

.time-range-btn {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.time-range-btn:hover {
    color: var(--text-primary);
}

.time-range-btn.active {
    background: var(--academic-primary-600);
    color: var(--text-inverse);
}

/* 刷新按钮 */
.chart-refresh-btn {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chart-refresh-btn:hover {
    background: var(--academic-primary-50);
    border-color: var(--academic-primary-300);
    color: var(--academic-primary-600);
}

.chart-refresh-btn.loading i {
    animation: spin 1s linear infinite;
}

/* 图表容器 */
.chart-container {
    position: relative;
    padding: var(--spacing-5);
    height: 280px;
}

.chart-container canvas {
    max-width: 100%;
    height: 100% !important;
}

/* 迷你图表容器 */
.chart-container-sm {
    height: 200px;
    padding: var(--spacing-4);
}

/* 大型图表容器 */
.chart-container-lg {
    height: 360px;
}

/* 图表加载状态 */
.chart-loading {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--academic-surface);
    z-index: 10;
}

.chart-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top-color: var(--academic-primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* 图表空状态 */
.chart-empty {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-tertiary);
}

.chart-empty i {
    font-size: var(--text-4xl);
    margin-bottom: var(--spacing-3);
    color: var(--text-tertiary);
}

.chart-empty-text {
    font-size: var(--text-sm);
}

/* 统计概览卡片 */
.stat-overview-card {
    background: var(--academic-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-4);
    transition: all var(--transition-fast);
    cursor: default;
}

.stat-overview-card:hover {
    border-color: var(--academic-primary-200);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.stat-overview-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    flex-shrink: 0;
}

.stat-overview-icon.primary {
    background: var(--academic-primary-100);
    color: var(--academic-primary-600);
}

.stat-overview-icon.success {
    background: var(--academic-success-100);
    color: var(--academic-success-600);
}

.stat-overview-icon.warning {
    background: var(--academic-warning-100);
    color: var(--academic-warning-600);
}

.stat-overview-icon.info {
    background: var(--academic-info-100);
    color: var(--academic-info-600);
}

.stat-overview-content {
    flex: 1;
    min-width: 0;
}

.stat-overview-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-1);
}

.stat-overview-value {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-overview-trend {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    font-size: var(--text-xs);
    margin-top: var(--spacing-2);
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-md);
}

.stat-overview-trend.up {
    background: var(--academic-success-50);
    color: var(--academic-success-600);
}

.stat-overview-trend.down {
    background: var(--academic-error-50);
    color: var(--academic-error-600);
}

.stat-overview-trend.neutral {
    background: var(--academic-bg-secondary);
    color: var(--text-secondary);
}

/* 图表网格布局 */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-5);
}

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

/* 统计卡片网格 */
.stats-overview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-5);
    margin-bottom: var(--spacing-6);
}

/* 进度环形图中心文字 */
.doughnut-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    pointer-events: none;
}

.doughnut-center-value {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    line-height: 1;
}

.doughnut-center-label {
    font-size: var(--text-sm);
    color: var(--text-tertiary);
    margin-top: var(--spacing-1);
}

/* 图表图例自定义样式 */
.chart-legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    padding: var(--spacing-4);
    border-top: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

.chart-legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-xs);
    color: var(--text-secondary);
}

.chart-legend-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

.chart-legend-dot.primary { background: var(--academic-primary-500); }
.chart-legend-dot.success { background: var(--academic-success-500); }
.chart-legend-dot.warning { background: var(--academic-warning-500); }
.chart-legend-dot.info { background: var(--academic-info-500); }
.chart-legend-dot.secondary { background: var(--academic-secondary-400); }

/* 数据概览内联图表 */
.sparkline {
    display: inline-block;
    vertical-align: middle;
    width: 80px;
    height: 24px;
}

/* 图表数据表格 */
.chart-data-table {
    width: 100%;
    font-size: var(--text-sm);
}

.chart-data-table th {
    text-align: left;
    padding: var(--spacing-2) var(--spacing-3);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
}

.chart-data-table td {
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
}

.chart-data-table tr:last-child td {
    border-bottom: none;
}

/* 响应式调整 */
@media (max-width: 1200px) {
    .stats-overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .stats-overview-grid {
        grid-template-columns: 1fr;
    }
    
    .charts-grid-3 {
        grid-template-columns: 1fr;
    }
    
    .chart-container {
        height: 220px;
        padding: var(--spacing-4);
    }
    
    .chart-container-lg {
        height: 280px;
    }
    
    .stat-overview-card {
        padding: var(--spacing-4);
    }
    
    .stat-overview-icon {
        width: 44px;
        height: 44px;
        font-size: var(--text-lg);
    }
    
    .stat-overview-value {
        font-size: var(--text-2xl);
    }
}

@media (max-width: 480px) {
    .chart-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-3);
    }
    
    .chart-card-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .time-range-selector {
        flex: 1;
    }
}

/* ============================================
   17. 文档类型导航组件 (Document Type Navigation)
   ============================================ */

.doc-type-nav {
    background: var(--academic-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.doc-type-nav__header {
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

.doc-type-nav__title {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.doc-type-nav__title i {
    color: var(--academic-primary-500);
}

.doc-type-nav__list {
    padding: var(--spacing-2);
}

.doc-type-nav__item {
    display: flex;
    align-items: center;
    padding: var(--spacing-3) var(--spacing-4);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.2s ease;
    margin-bottom: var(--spacing-1);
    cursor: pointer;
}

.doc-type-nav__item:last-child {
    margin-bottom: 0;
}

.doc-type-nav__item:hover {
    background: var(--academic-bg-secondary);
}

.doc-type-nav__item--active {
    background: var(--academic-primary-50);
    color: var(--academic-primary-700);
}

.doc-type-nav__item--active:hover {
    background: var(--academic-primary-100);
}

.doc-type-nav__icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--text-sm);
    margin-right: var(--spacing-3);
    flex-shrink: 0;
}

.doc-type-nav__name {
    flex: 1;
    font-weight: 500;
    font-size: var(--text-sm);
}

.doc-type-nav__count {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    background: var(--academic-bg-secondary);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.doc-type-nav__item--active .doc-type-nav__count {
    background: var(--academic-primary-100);
    color: var(--academic-primary-700);
}

.doc-type-nav__footer {
    padding: var(--spacing-3) var(--spacing-4);
    border-top: 1px solid var(--border-light);
    background: var(--academic-bg-secondary);
}

.doc-type-nav__stats {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.doc-type-nav__stats-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.doc-type-nav__stats-item i {
    color: var(--academic-primary-400);
}

.doc-type-nav--loading {
    opacity: 0.6;
    pointer-events: none;
}

/* ============================================
   18. 文档类型选择器组件 (Document Type Selector)
   ============================================ */

.doc-type-selector {
    margin-bottom: var(--spacing-6);
}

.doc-type-selector__label {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-3);
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.doc-type-selector__required {
    color: var(--academic-error-500);
}

.doc-type-selector__cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
}

.doc-type-selector__card {
    background: var(--academic-surface);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.doc-type-selector__card:hover {
    border-color: var(--academic-primary-300);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.doc-type-selector__card--selected {
    border-color: var(--academic-primary-500);
    background: var(--academic-primary-50);
    box-shadow: var(--shadow-md);
}

.doc-type-selector__card--selected:hover {
    border-color: var(--academic-primary-600);
}

.doc-type-selector__card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-2);
}

.doc-type-selector__card-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    background: var(--academic-bg-secondary);
}

.doc-type-selector__card--selected .doc-type-selector__card-icon {
    background: white;
}

.doc-type-selector__card-name {
    font-weight: 600;
    font-size: var(--text-base);
    color: var(--text-primary);
    flex: 1;
}

.doc-type-selector__card-check {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: var(--academic-primary-500);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
}

.doc-type-selector__card-description {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--spacing-2);
}

.doc-type-selector__card-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    padding-top: var(--spacing-2);
    border-top: 1px solid var(--border-light);
}

.doc-type-selector__card-words {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: var(--spacing-1);
}

.doc-type-selector__card-words i {
    color: var(--academic-primary-400);
}

/* 响应式适配 */
@media (max-width: 768px) {
    .doc-type-selector__cards {
        grid-template-columns: 1fr;
    }
    
    .doc-type-selector__card {
        padding: var(--spacing-3);
    }
    
    .doc-type-selector__card-icon {
        width: 36px;
        height: 36px;
    }
}

@media (max-width: 480px) {
    .doc-type-nav__item {
        padding: var(--spacing-2) var(--spacing-3);
    }
    
    .doc-type-nav__icon {
        width: 28px;
        height: 28px;
        font-size: var(--text-xs);
    }
    
    .doc-type-nav__name {
        font-size: var(--text-xs);
    }
}

/* ============================================
   19. 生成进度组件 (Generation Progress)
   ============================================ */

.generation-progress {
    background: var(--academic-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.generation-progress__header {
    padding: var(--spacing-4) var(--spacing-5);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.generation-progress__title {
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.generation-progress__title i {
    color: var(--academic-primary-500);
}

.generation-progress__status {
    font-size: var(--text-xs);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.generation-progress__status--running {
    background: var(--academic-info-50);
    color: var(--academic-info-700);
}

.generation-progress__status--paused {
    background: var(--academic-warning-50);
    color: var(--academic-warning-700);
}

.generation-progress__status--completed {
    background: var(--academic-success-50);
    color: var(--academic-success-700);
}

.generation-progress__status--failed {
    background: var(--academic-error-50);
    color: var(--academic-error-700);
}

.generation-progress__bar-container {
    padding: var(--spacing-4) var(--spacing-5);
    background: var(--academic-bg-secondary);
}

.generation-progress__bar {
    height: 8px;
    background: var(--academic-bg);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.generation-progress__bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--academic-primary-500), var(--academic-primary-400));
    border-radius: var(--radius-full);
    transition: width 0.3s ease;
}

.generation-progress__stats {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-2);
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

.generation-progress__chapters {
    padding: var(--spacing-3) var(--spacing-5);
    max-height: 300px;
    overflow-y: auto;
}

.generation-progress__chapter {
    display: flex;
    align-items: center;
    padding: var(--spacing-2) 0;
    border-bottom: 1px solid var(--border-light);
    font-size: var(--text-sm);
}

.generation-progress__chapter:last-child {
    border-bottom: none;
}

.generation-progress__chapter-icon {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-3);
    font-size: var(--text-xs);
}

.generation-progress__chapter--completed .generation-progress__chapter-icon {
    background: var(--academic-success-100);
    color: var(--academic-success-600);
}

.generation-progress__chapter--generating .generation-progress__chapter-icon {
    background: var(--academic-info-100);
    color: var(--academic-info-600);
    animation: pulse 1.5s infinite;
}

.generation-progress__chapter--pending .generation-progress__chapter-icon {
    background: var(--academic-bg-secondary);
    color: var(--text-tertiary);
}

.generation-progress__chapter--failed .generation-progress__chapter-icon {
    background: var(--academic-error-100);
    color: var(--academic-error-600);
}

.generation-progress__chapter-title {
    flex: 1;
    color: var(--text-primary);
}

.generation-progress__chapter-words {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}