/* ============================================
   UI设计系统 - 完整CSS样式文件
   布局：左右分栏 + 大留白
   风格：毛玻璃效果 + 圆角 + 微交互动效
   ============================================ */

/* ==================== 1. CSS变量定义 ==================== */
:root {
    /* 主色调 */
    --color-primary: #3B82F6;
    --color-primary-light: #60A5FA;
    --color-primary-dark: #2563EB;
    --color-primary-alpha: rgba(59, 130, 246, 0.1);
    
    /* 辅助色 */
    --color-secondary: #8B5CF6;
    --color-accent: #06B6D4;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-danger: #EF4444;
    
    /* 中性色 */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F8FAFC;
    --color-bg-tertiary: #F1F5F9;
    --color-text-primary: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-muted: #94A3B8;
    --color-border: #E2E8F0;
    --color-border-light: #F1F5F9;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
    --gradient-hero: linear-gradient(180deg, #EEF2FF 0%, #FFFFFF 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.8) 100%);
    --gradient-text: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 50%, #EC4899 100%);
    
    /* 毛玻璃效果 */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-dark: rgba(30, 41, 59, 0.8);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-blur: blur(20px);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.3);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    
    /* 字体 */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Monaco', monospace;
    
    /* 字号 */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* 行高 */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* 布局 */
    --sidebar-width: 280px;
    --content-max-width: 1200px;
    --large-padding: clamp(24px, 5vw, 80px);
}

/* ==================== 2. 全局重置与基础样式 ==================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* 选中文字样式 */
::selection {
    background-color: var(--color-primary);
    color: white;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-text-muted);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* ==================== 3. 排版样式 ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--leading-tight);
    color: var(--color-text-primary);
}

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);
}

h4 {
    font-size: var(--text-2xl);
}

h5 {
    font-size: var(--text-xl);
}

h6 {
    font-size: var(--text-lg);
}

p {
    margin-bottom: var(--space-md);
    color: var(--color-text-secondary);
}

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

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

strong {
    font-weight: 600;
}

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

/* 渐变文字效果 */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==================== 4. 主布局 - 左右分栏 ==================== */
.layout-container {
    display: flex;
    min-height: 100vh;
}

/* 左侧边栏 */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--glass-border);
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-base);
}

/* 毛玻璃效果变体 */
.sidebar--glass {
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.9) 0%,
        rgba(255, 255, 255, 0.6) 100%
    );
    box-shadow: var(--glass-shadow);
}

.sidebar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.sidebar__logo-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: var(--text-xl);
    box-shadow: var(--shadow-md);
}

.sidebar__logo-text {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* 导航菜单 */
.nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav__section {
    margin-bottom: var(--space-lg);
}

.nav__title {
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    padding-left: var(--space-md);
}

.nav__item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav__item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: height var(--transition-base);
}

.nav__item:hover {
    background: var(--color-primary-alpha);
    color: var(--color-primary);
}

.nav__item:hover::before {
    height: 60%;
}

.nav__item--active {
    background: var(--color-primary-alpha);
    color: var(--color-primary);
}

.nav__item--active::before {
    height: 60%;
}

.nav__icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* 侧边栏底部 */
.sidebar__footer {
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

.user-card {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
    cursor: pointer;
}

.user-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.user-card__avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: var(--text-lg);
}

.user-card__info {
    flex: 1;
    min-width: 0;
}

.user-card__name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-card__role {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* 主内容区 */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--large-padding);
    background: var(--color-bg-secondary);
}

/* 大留白容器 */
.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* 页面标题区 */
.page-header {
    margin-bottom: var(--space-3xl);
}

.page-header__title {
    font-size: var(--text-4xl);
    font-weight: 800;
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

.page-header__subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
}

/* ==================== 5. 卡片组件 ==================== */
.card {
    background: var(--gradient-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
}

.card:hover::before {
    opacity: 1;
}

.card--glass {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

.card--flat {
    box-shadow: none;
    border: 1px solid var(--color-border);
}

.card--flat:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.card__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.card__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    background: var(--color-primary-alpha);
    color: var(--color-primary);
    transition: all var(--transition-base);
}

.card:hover .card__icon {
    transform: scale(1.1) rotate(5deg);
    background: var(--gradient-primary);
    color: white;
}

.card__title {
    font-size: var(--text-xl);
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.card__description {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    line-height: var(--leading-relaxed);
}

.card__footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border-light);
}

.card__link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--color-primary);
    transition: gap var(--transition-fast);
}

.card__link:hover {
    gap: var(--space-md);
}

.card__link svg {
    transition: transform var(--transition-fast);
}

.card__link:hover svg {
    transform: translateX(4px);
}

/* 卡片网格 */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
}

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

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

/* ==================== 6. 按钮组件 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-full);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

/* 主要按钮 */
.btn--primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.btn--primary:active {
    transform: translateY(0);
}

/* 次要按钮 */
.btn--secondary {
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

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

/* 幽灵按钮 */
.btn--ghost {
    background: transparent;
    color: var(--color-text-secondary);
}

.btn--ghost:hover {
    background: var(--color-primary-alpha);
    color: var(--color-primary);
}

/* 渐变轮廓按钮 */
.btn--outline-gradient {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid transparent;
    background-image: linear-gradient(white, white), var(--gradient-primary);
    background-origin: border-box;
    background-clip: padding-box, border-box;
}

.btn--outline-gradient:hover {
    background-image: var(--gradient-primary), var(--gradient-primary);
    color: white;
}

/* 按钮尺寸 */
.btn--sm {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-xs);
}

.btn--lg {
    padding: var(--space-lg) var(--space-2xl);
    font-size: var(--text-base);
    border-radius: var(--radius-lg);
}

.btn--full {
    width: 100%;
}

/* 按钮组 */
.btn-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn-group--vertical {
    flex-direction: column;
}

/* ==================== 7. 表单组件 ==================== */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
}

.form-label--required::after {
    content: '*';
    color: var(--color-danger);
    margin-left: var(--space-xs);
}

.form-input {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-family: inherit;
    font-size: var(--text-base);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.form-input:hover:not(:focus) {
    border-color: var(--color-primary-light);
}

/* 输入框毛玻璃变体 */
.form-input--glass {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}

/* 文本域 */
.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* 选择框 */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-md) center;
    background-size: 20px;
    padding-right: var(--space-2xl);
}

/* 复选框 & 单选框 */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
}

.form-check__input {
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    appearance: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

.form-check__input:checked {
    background: var(--gradient-primary);
    border-color: var(--color-primary);
}

.form-check__input:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: var(--text-xs);
    font-weight: 700;
}

.form-check__input--radio {
    border-radius: var(--radius-full);
}

.form-check__input--radio:checked::after {
    content: '';
    width: 8px;
    height: 8px;
    background: white;
    border-radius: var(--radius-full);
}

/* 开关 */
.form-switch {
    position: relative;
    width: 52px;
    height: 28px;
}

.form-switch__input {
    opacity: 0;
    width: 0;
    height: 0;
}

.form-switch__slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-border);
    border-radius: var(--radius-full);
    transition: var(--transition-base);
}

.form-switch__slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.form-switch__input:checked + .form-switch__slider {
    background: var(--gradient-primary);
}

.form-switch__input:checked + .form-switch__slider::before {
    transform: translateX(24px);
}

/* ==================== 8. 导航栏组件 ==================== */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-xl);
}

.navbar--fixed {
    position: fixed;
    top: var(--space-lg);
    left: calc(var(--sidebar-width) + var(--space-xl));
    right: var(--space-xl);
    z-index: 50;
}

.navbar__brand {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.navbar__menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.navbar__link {
    position: relative;
    padding: var(--space-sm) 0;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.navbar__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-base);
}

.navbar__link:hover,
.navbar__link--active {
    color: var(--color-primary);
}

.navbar__link:hover::after,
.navbar__link--active::after {
    transform: scaleX(1);
    transform-origin: left;
}

.navbar__actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* 搜索框 */
.search-box {
    position: relative;
    width: 320px;
}

.search-box__input {
    width: 100%;
    padding: var(--space-sm) var(--space-lg);
    padding-left: 44px;
    background: var(--color-bg-tertiary);
    border: 1px solid transparent;
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
}

.search-box__input:focus {
    background: var(--color-bg-primary);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.search-box__icon {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

/* ==================== 9. 徽章与标签 ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-md);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
}

.badge--primary {
    background: var(--color-primary-alpha);
    color: var(--color-primary);
}

.badge--success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.badge--warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
}

.badge--danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
}

/* 标签 */
.tag {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--text-xs);
    font-weight: 500;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--color-primary-alpha);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ==================== 10. 头像组件 ==================== */
.avatar {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    font-size: var(--text-sm);
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar--sm {
    width: 32px;
    height: 32px;
    font-size: var(--text-xs);
}

.avatar--lg {
    width: 56px;
    height: 56px;
    font-size: var(--text-lg);
}

.avatar--xl {
    width: 80px;
    height: 80px;
    font-size: var(--text-2xl);
}

.avatar__status {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--color-success);
    border: 2px solid white;
}

.avatar__status--offline {
    background: var(--color-text-muted);
}

.avatar__status--busy {
    background: var(--color-danger);
}

/* 头像组 */
.avatar-group {
    display: flex;
}

.avatar-group .avatar {
    margin-left: -10px;
    border: 3px solid white;
    transition: transform var(--transition-fast);
}

.avatar-group .avatar:first-child {
    margin-left: 0;
}

.avatar-group .avatar:hover {
    transform: translateY(-4px);
    z-index: 1;
}

/* ==================== 11. 进度条组件 ==================== */
.progress {
    width: 100%;
    height: 8px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress--sm {
    height: 4px;
}

.progress--lg {
    height: 12px;
}

.progress__bar {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width 0.6s ease;
    position: relative;
}

.progress__bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%
    );
    animation: progress-shine 2s infinite;
}

@keyframes progress-shine {
    0% {
        transform: translateX(-100%);
    }
    100% {
        transform: translateX(100%);
    }
}

/* ==================== 12. 列表组件 ==================== */
.list {
    display: flex;
    flex-direction: column;
}

.list__item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border-light);
    transition: background var(--transition-fast);
}

.list__item:hover {
    background: var(--color-bg-tertiary);
}

.list__item:last-child {
    border-bottom: none;
}

.list__icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-alpha);
    color: var(--color-primary);
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

.list__content {
    flex: 1;
    min-width: 0;
}

.list__title {
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.list__subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.list__action {
    flex-shrink: 0;
}

/* ==================== 13. 模态框组件 ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

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

.modal {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: auto;
    transform: scale(0.9) translateY(20px);
    transition: transform var(--transition-base);
}

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

.modal--glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-xl);
    border-bottom: 1px solid var(--color-border-light);
}

.modal__title {
    font-size: var(--text-xl);
    font-weight: 700;
}

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

.modal__close:hover {
    background: var(--color-danger);
    color: white;
}

.modal__body {
    padding: var(--space-xl);
}

.modal__footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-md);
    padding: var(--space-xl);
    border-top: 1px solid var(--color-border-light);
}

/* ==================== 14. 工具提示组件 ==================== */
.tooltip {
    position: relative;
}

.tooltip__content {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(4px);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-text-primary);
    color: white;
    font-size: var(--text-xs);
    font-weight: 500;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: 100;
}

.tooltip__content::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: var(--color-text-primary);
}

.tooltip:hover .tooltip__content {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ==================== 15. 分页组件 ==================== */
.pagination {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.pagination__item {
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--space-md);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pagination__item:hover {
    background: var(--color-primary-alpha);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.pagination__item--active {
    background: var(--gradient-primary);
    border-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
}

.pagination__item--disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.pagination__ellipsis {
    padding: 0 var(--space-sm);
    color: var(--color-text-muted);
}

/* ==================== 16. 面包屑导航 ==================== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.breadcrumb__item {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.breadcrumb__item:hover {
    color: var(--color-primary);
}

.breadcrumb__separator {
    color: var(--color-text-muted);
}

.breadcrumb__item--active {
    color: var(--color-text-primary);
    font-weight: 500;
}

/* ==================== 17. 统计数据卡片 ==================== */
.stat-card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-lg);
}

.stat-card__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-alpha);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    font-size: var(--text-xl);
}

.stat-card__trend {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
}

.stat-card__trend--up {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.stat-card__trend--down {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
}

.stat-card__value {
    font-size: var(--text-4xl);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.stat-card__label {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

/* ==================== 18. 几何装饰元素 ==================== */
.decorator {
    position: absolute;
    pointer-events: none;
}

.decorator--circle {
    border-radius: var(--radius-full);
}

.decorator--square {
    border-radius: var(--radius-md);
}

.decorator--triangle {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 86px solid var(--color-primary-alpha);
}

.decorator--gradient {
    background: var(--gradient-primary);
}

.decorator--1 {
    top: 10%;
    right: 5%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--color-primary-alpha) 0%, transparent 70%);
}

.decorator--2 {
    bottom: 20%;
    left: 10%;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, var(--color-secondary) 0%, transparent 70%);
    opacity: 0.5;
}

.decorator--3 {
    top: 50%;
    right: 15%;
    width: 100px;
    height: 100px;
    border: 3px solid var(--color-primary-alpha);
}

/* 背景图案 */
.bg-pattern {
    background-image: 
        radial-gradient(circle at 25% 25%, var(--color-primary-alpha) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

/* ==================== 19. 辅助类 ==================== */

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.gap-2xl { gap: var(--space-2xl); }

/* Grid */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* 间距 */
.m-0 { margin: 0; }
.m-auto { margin: auto; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

.p-0 { padding: 0; }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }
.p-2xl { padding: var(--space-2xl); }

/* 文本 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }

/* 背景 */
.bg-white { background-color: var(--color-bg-primary); }
.bg-gray { background-color: var(--color-bg-secondary); }
.bg-gradient { background: var(--gradient-primary); }

/* 显示 */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }

/* 圆角 */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

/* 阴影 */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* 边框 */
.border { border: 1px solid var(--color-border); }
.border-light { border-color: var(--color-border-light); }

/* 宽度 */
.w-full { width: 100%; }
.w-auto { width: auto; }

/* 溢出 */
.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

/* 位置 */
.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.sticky { position: sticky; }

/* 动画 */
.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.animate-slide-up {
    animation: slideUp 0.6s ease forwards;
}

.animate-scale-in {
    animation: scaleIn 0.4s ease forwards;
}

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

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ==================== 20. 响应式设计 ==================== */

/* 平板设备 */
@media (max-width: 1200px) {
    :root {
        --sidebar-width: 240px;
        --large-padding: clamp(16px, 3vw, 48px);
    }
    
    .card-grid--4 {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .card-grid--3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 平板竖屏 */
@media (max-width: 992px) {
    :root {
        --sidebar-width: 72px;
        --large-padding: var(--space-lg);
    }
    
    .sidebar__logo-text,
    .nav__title,
    .nav__item span,
    .user-card__info {
        display: none;
    }
    
    .sidebar__logo {
        justify-content: center;
    }
    
    .nav__item {
        justify-content: center;
        padding: var(--space-md);
    }
    
    .user-card {
        justify-content: center;
        padding: var(--space-sm);
    }
    
    .card-grid--4,
    .card-grid--3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .navbar--fixed {
        left: calc(var(--sidebar-width) + var(--space-md));
        right: var(--space-md);
    }
    
    .search-box {
        width: 240px;
    }
}

/* 大手机 */
@media (max-width: 768px) {
    :root {
        --sidebar-width: 0px;
        --large-padding: var(--space-md);
    }
    
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
        padding: var(--space-lg);
    }
    
    .sidebar--open {
        transform: translateX(0);
    }
    
    .sidebar__logo-text,
    .nav__title,
    .nav__item span,
    .user-card__info {
        display: block;
    }
    
    .sidebar__overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .sidebar--open + .sidebar__overlay {
        opacity: 1;
        visibility: visible;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .navbar--fixed {
        left: var(--space-md);
        right: var(--space-md);
    }
    
    .search-box {
        display: none;
    }
    
    .card-grid--4,
    .card-grid--3,
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: var(--text-4xl);
    }
    
    h2 {
        font-size: var(--text-3xl);
    }
    
    .page-header__title {
        font-size: var(--text-3xl);
    }
    
    .stat-card__value {
        font-size: var(--text-3xl);
    }
}

/* 小手机 */
@media (max-width: 480px) {
    :root {
        --space-lg: 16px;
        --space-xl: 24px;
    }
    
    .btn--full-mobile {
        width: 100%;
    }
    
    .card {
        padding: var(--space-lg);
    }
    
    .modal {
        width: 95%;
        margin: var(--space-md);
    }
    
    .pagination__item {
        min-width: 36px;
        height: 36px;
        padding: 0 var(--space-sm);
        font-size: var(--text-xs);
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
}

/* ==================== 21. 打印样式 ==================== */
@media print {
    .sidebar,
    .navbar,
    .btn,
    .modal-overlay {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
    
    body {
        background: white;
        color: black;
    }
}
```