/* ============================================
   CSS 样式文件 - 卡片式瀑布流布局
   设计特点：毛玻璃效果、渐变背景、微交互动效、圆角设计
   ============================================ */

/* ============================================
   1. CSS 变量定义
   ============================================ */
:root {
    /* 主色调 */
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    
    /* 辅助色 */
    --secondary-color: #ec4899;
    --accent-color: #14b8a6;
    --warning-color: #f59e0b;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
    --gradient-secondary: linear-gradient(135deg, #14b8a6 0%, #6366f1 100%);
    --gradient-bg: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    --gradient-text: linear-gradient(135deg, #6366f1, #ec4899);
    
    /* 背景色 */
    --bg-dark: #0f0f23;
    --bg-card: rgba(255, 255, 255, 0.08);
    --bg-glass: rgba(255, 255, 255, 0.1);
    --bg-glass-hover: rgba(255, 255, 255, 0.15);
    
    /* 文字颜色 */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px rgba(99, 102, 241, 0.3);
    
    /* 边框 */
    --border-subtle: 1px solid rgba(255, 255, 255, 0.1);
    --border-glass: 1px solid rgba(255, 255, 255, 0.2);
    
    /* 毛玻璃效果 */
    --glass-blur: blur(20px);
    --glass-bg: rgba(255, 255, 255, 0.08);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 字体 */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Poppins', sans-serif;
}

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

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

body {
    font-family: var(--font-primary);
    background: var(--gradient-bg);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 背景装饰 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(20, 184, 166, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

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

ul, ol {
    list-style: none;
}

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

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

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

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

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* ============================================
   3. 排版样式
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1rem;
}

h6 {
    font-size: 0.875rem;
}

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

.text-gradient {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

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

/* ============================================
   4. 容器与布局
   ============================================ */
.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-sm {
    max-width: 800px;
}

.container-lg {
    max-width: 1600px;
}

/* 主布局 */
.main-content {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 80px);
}

/* 页面标题区 */
.page-header {
    text-align: center;
    padding: var(--spacing-2xl) 0;
    margin-bottom: var(--spacing-xl);
}

.page-header__title {
    margin-bottom: var(--spacing-md);
}

.page-header__subtitle {
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.125rem;
}

/* ============================================
   5. 瀑布流布局系统
   ============================================ */
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    grid-auto-flow: dense;
}

/* 不同尺寸的卡片 */
.masonry-grid .card--large {
    grid-column: span 2;
    grid-row: span 2;
}

.masonry-grid .card--wide {
    grid-column: span 2;
    grid-row: span 1;
}

.masonry-grid .card--tall {
    grid-column: span 1;
    grid-row: span 2;
}

.masonry-grid .card--small {
    grid-column: span 1;
    grid-row: span 1;
}

/* 响应式瀑布流 */
@media (max-width: 1200px) {
    .masonry-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 900px) {
    .masonry-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .masonry-grid .card--large {
        grid-column: span 2;
        grid-row: span 1;
    }
    
    .masonry-grid .card--tall {
        grid-row: span 1;
    }
}

@media (max-width: 600px) {
    .masonry-grid {
        grid-template-columns: 1fr;
    }
    
    .masonry-grid .card--large,
    .masonry-grid .card--wide,
    .masonry-grid .card--tall {
        grid-column: span 1;
        grid-row: span 1;
    }
}

/* ============================================
   6. 毛玻璃卡片组件
   ============================================ */
.card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: 
        transform var(--transition-normal),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(255, 255, 255, 0.1) 0%,
        rgba(255, 255, 255, 0) 50%
    );
    pointer-events: none;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border-color: rgba(255, 255, 255, 0.25);
}

.card__image {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.card__image img {
    width: 100%;
    height: auto;
    transition: transform var(--transition-slow);
}

.card:hover .card__image img {
    transform: scale(1.08);
}

.card__image--overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-lg);
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
}

.card__content {
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.card__tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.card__tag--primary {
    background: var(--gradient-primary);
    color: white;
}

.card__tag--secondary {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.card__title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    transition: var(--transition-fast);
}

.card:hover .card__title {
    color: var(--primary-light);
}

.card__description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card__meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

.card__footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* 卡片悬停装饰 */
.card__decoration {
    position: absolute;
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--gradient-primary);
    filter: blur(60px);
    opacity: 0;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.card:hover .card__decoration {
    opacity: 0.3;
}

.card__decoration--1 {
    top: -30px;
    right: -30px;
}

.card__decoration--2 {
    bottom: -30px;
    left: -30px;
    background: var(--gradient-secondary);
}

/* ============================================
   7. 导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: var(--border-subtle);
    transition: var(--transition-normal);
}

.navbar--scrolled {
    padding: var(--spacing-sm) 0;
    background: rgba(15, 15, 35, 0.95);
    box-shadow: var(--shadow-md);
}

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

.navbar__brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar__brand-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

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

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

.navbar__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-normal);
}

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

.navbar__link:hover::after,
.navbar__link--active::after {
    width: 100%;
}

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

/* 移动端菜单 */
.navbar__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.navbar__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

@media (max-width: 900px) {
    .navbar__menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(15, 15, 35, 0.98);
        backdrop-filter: blur(20px);
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }
    
    .navbar__menu--active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .navbar__toggle {
        display: flex;
    }
}

/* ============================================
   8. 按钮样式
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-weight: 600;
    font-size: 0.9rem;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

/* 主要按钮 */
.btn--primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

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

/* 次要按钮 */
.btn--secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: var(--border-glass);
    backdrop-filter: blur(10px);
}

.btn--secondary:hover {
    background: var(--bg-glass-hover);
    border-color: rgba(255, 255, 255, 0.3);
}

/* 轮廓按钮 */
.btn--outline {
    background: transparent;
    color: var(--primary-light);
    border: 2px solid var(--primary-color);
}

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

/* 文字按钮 */
.btn--text {
    background: transparent;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
}

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

/* 按钮尺寸 */
.btn--sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.8rem;
}

.btn--lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: 1rem;
}

/* 按钮图标 */
.btn__icon {
    width: 20px;
    height: 20px;
}

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

/* ============================================
   9. 表单样式
   ============================================ */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form__group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form__label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.form__label--required::after {
    content: ' *';
    color: var(--secondary-color);
}

.form__input,
.form__textarea,
.form__select {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
    backdrop-filter: blur(10px);
}

.form__input::placeholder,
.form__textarea::placeholder {
    color: var(--text-muted);
}

.form__input:hover,
.form__textarea:hover,
.form__select:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

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

.form__select {
    cursor: pointer;
    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='%23ffffff' 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(--spacing-md) center;
    background-size: 16px;
    padding-right: var(--spacing-2xl);
}

/* 输入框组 */
.form__input-group {
    display: flex;
    gap: var(--spacing-sm);
}

.form__input-addon {
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-md);
    background: var(--bg-glass);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-muted);
}

/* 复选框和单选框 */
.form__checkbox,
.form__radio {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.form__checkbox input,
.form__radio input {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* 焦点状态 */
.form__input--error,
.form__textarea--error,
.form__select--error {
    border-color: var(--secondary-color);
}

.form__error {
    font-size: 0.8rem;
    color: var(--secondary-color);
}

/* 搜索框 */
.search-box {
    position: relative;
    max-width: 400px;
}

.search-box__input {
    padding-left: 50px;
}

.search-box__icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}

/* ============================================
   10. 徽章与标签
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    background: var(--glass-bg);
    border: var(--border-subtle);
}

.badge--primary {
    background: var(--gradient-primary);
    border: none;
}

.badge--success {
    background: linear-gradient(135deg, #10b981, #059669);
    border: none;
    color: white;
}

.badge--warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    border: none;
    color: white;
}

.badge--error {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    border: none;
    color: white;
}

/* ============================================
   11. 头像与图片
   ============================================ */
.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition-fast);
}

.avatar:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-glow);
}

.avatar--sm {
    width: 32px;
    height: 32px;
}

.avatar--lg {
    width: 64px;
    height: 64px;
}

.avatar--xl {
    width: 96px;
    height: 96px;
}

.avatar-group {
    display: flex;
}

.avatar-group .avatar {
    margin-left: -12px;
    border: 2px solid var(--bg-dark);
}

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

/* ============================================
   12. 分页与导航组件
   ============================================ */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.pagination__item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition-fast);
    background: var(--glass-bg);
    border: var(--border-subtle);
}

.pagination__item:hover {
    background: var(--bg-glass-hover);
    border-color: rgba(255, 255, 255, 0.2);
}

.pagination__item--active {
    background: var(--gradient-primary);
    border: none;
    color: white;
}

.pagination__item--disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

/* ============================================
   13. 模态框与弹出层
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

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

.modal__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal__content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    background: rgba(30, 30, 60, 0.95);
    backdrop-filter: blur(20px);
    border: var(--border-subtle);
    border-radius: var(--radius-xl);
    transform: scale(0.9) translateY(20px);
    transition: var(--transition-normal);
}

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

.modal__header {
    padding: var(--spacing-lg);
    border-bottom: var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal__title {
    font-size: 1.25rem;
    margin-bottom: 0;
}

.modal__close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.modal__close:hover {
    background: var(--bg-glass);
    color: var(--text-primary);
}

.modal__body {
    padding: var(--spacing-lg);
}

.modal__footer {
    padding: var(--spacing-lg);
    border-top: var(--border-subtle);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

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

.tooltip__content {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-dark);
    color: var(--text-primary);
    font-size: 0.8rem;
    white-space: nowrap;
    border-radius: var(--radius-sm);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
    z-index: 100;
    box-shadow: var(--shadow-md);
}

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

.tooltip:hover .tooltip__content {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   15. 加载状态
   ============================================ */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--glass-bg);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.skeleton {
    background: linear-gradient(
        90deg,
        var(--glass-bg) 25%,
        rgba(255, 255, 255, 0.1) 50%,
        var(--glass-bg) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-md);
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.skeleton--text {
    height: 1em;
    margin-bottom: var(--spacing-sm);
}

.skeleton--title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--spacing-md);
}

.skeleton--image {
    height: 200px;
}

/* ============================================
   16. 动画与过渡效果
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

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

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20%);
    }
}

.animate-fade-in {
    animation: fadeIn 0.5s ease forwards;
}

.animate-slide-up {
    animation: slideUp 0.5s ease forwards;
}

.animate-scale-in {
    animation: scaleIn 0.3s ease forwards;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* 交错动画 */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }

/* ============================================
   17. 装饰元素
   ============================================ */
.decoration {
    position: absolute;
    pointer-events: none;
}

.decoration--circle {
    border-radius: 50%;
    background: var(--gradient-primary);
    filter: blur(80px);
    opacity: 0.3;
}

.decoration--ring {
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.decoration--line {
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

.decoration--dots {
    background-image: radial-gradient(rgba(255, 255, 255, 0.3) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* 几何图形 */
.geometric-shape {
    position: absolute;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.geometric-shape--triangle {
    width: 0;
    height: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
    border-bottom: 86px solid rgba(99, 102, 241, 0.2);
}

.geometric-shape--square {
    width: 100px;
    height: 100px;
    background: rgba(236, 72, 153, 0.1);
    transform: rotate(45deg);
}

.geometric-shape--hexagon {
    width: 100px;
    height: 57.74px;
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.2), transparent);
    position: relative;
}

.geometric-shape--hexagon::before,
.geometric-shape--hexagon::after {
    content: '';
    position: absolute;
    width: 0;
    border-left: 50px solid transparent;
    border-right: 50px solid transparent;
}

.geometric-shape--hexagon::before {
    bottom: 100%;
    border-bottom: 28.87px solid rgba(20, 184, 166, 0.2);
}

.geometric-shape--hexagon::after {
    top: 100%;
    border-top: 28.87px solid rgba(20, 184, 166, 0.2);
}

/* ============================================
   18. 响应式媒体查询
   ============================================ */

/* 大屏幕 */
@media (max-width: 1400px) {
    .container {
        max-width: 1200px;
    }
}

/* 笔记本电脑 */
@media (max-width: 1200px) {
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* 平板电脑 */
@media (max-width: 992px) {
    html {
        font-size: 14px;
    }
    
    .main-content {
        padding: var(--spacing-xl) 0;
    }
    
    .page-header {
        padding: var(--spacing-xl) 0;
    }
}

/* 大手机 */
@media (max-width: 768px) {
    html {
        font-size: 13px;
    }
    
    .card__content {
        padding: var(--spacing-md);
    }
    
    .btn--lg {
        padding: var(--spacing-md) var(--spacing-xl);
    }
}

/* 手机 */
@media (max-width: 576px) {
    html {
        font-size: 12px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .modal {
        padding: var(--spacing-sm);
    }
    
    .modal__content {
        border-radius: var(--radius-lg);
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        width: 100%;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .card:hover {
        transform: none;
    }
    
    .btn:hover::before {
        display: none;
    }
    
    .tooltip__content {
        display: none;
    }
}

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

/* 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --glass-bg: rgba(0, 0, 0, 0.5);
        --border-subtle: 2px solid white;
    }
}

/* 暗色模式（已默认，此处可添加亮色模式变体） */
@media (prefers-color-scheme: light) {
    /* 如需亮色模式可在此处覆盖 */
}

/* ============================================
   19. 打印样式
   ============================================ */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .navbar,
    .btn,
    .modal,
    .decoration {
        display: none !important;
    }
    
    .card {
        break-inside: avoid;
        background: white;
        border: 1px solid #ccc;
    }
    
    .text-gradient {
        background: none;
        -webkit-text-fill-color: black;
    }
}

/* ============================================
   20. 辅助类
   ============================================ */

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

.visible {
    display: block !important;
}

.invisible {
    visibility: hidden;
}

/* 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(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* 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; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }

/* 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: 50%; }

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

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

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

.inset-0 {
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

/* 宽度/高度 */
.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

/* 层级 */
.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-50 { z-index: 50; }
.z-100 { z-index: 100; }

/* 光标 */
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

/* 过渡 */
.transition {
    transition: var(--transition-normal);
}

/* 不透明度 */
.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

/* ============================================
   21. 组件特定样式
   ============================================ */

/* Hero 区域 */
.hero {
    min-height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-2xl);
    position: relative;
    overflow: hidden;
}

.hero__title {
    font-size: clamp(3rem, 8vw, 5rem);
    margin-bottom: var(--spacing-lg);
}

.hero__subtitle {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    color: var(--text-secondary);
}

.hero__decoration {
    position: absolute;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: var(--gradient-primary);
    filter: blur(150px);
    opacity: 0.2;
    pointer-events: none;
}

.hero__decoration--1 {
    top: -200px;
    left: -100px;
}

.hero__decoration--2 {
    bottom: -200px;
    right: -100px;
    background: var(--gradient-secondary);
}

/* 特色区块 */
.features {
    padding: var(--spacing-2xl) 0;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.2);
}

.feature-card__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.feature-card__title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card__description {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 页脚 */
.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background: rgba(0, 0, 0, 0.3);
    border-top: var(--border-subtle);
    margin-top: var(--spacing-2xl);
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__section h4 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__link {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer__bottom {
    padding-top: var(--spacing-lg);
    border-top: var(--border-subtle);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer__social {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer__social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.footer__social-link:hover {
    background: var(--bg-glass-hover);
    transform: translateY(-2px);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-state__icon {
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
    background: var(--glass-bg);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    opacity: 0.5;
}

.empty-state__title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.empty-state__description {
    color: var(--text-muted);
    max-width: 400px;
    margin: 0 auto var(--spacing-lg);
}

/* 筛选栏 */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: var(--border-subtle);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.filter-bar__title {
    font-weight: 600;
    margin-right: var(--spacing-sm);
}

.filter-bar__btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-glass);
    border: var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: var(--transition-fast);
}

.filter-bar__btn:hover,
.filter-bar__btn--active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}
```