/* ================================================
   现代瀑布流网站 - 完整CSS样式表
   布局: 卡片式瀑布流
   风格: 毛玻璃效果 + 渐变 + 大号粗体标题
   ================================================ */

/* ==================== CSS变量定义 ==================== */
:root {
  /* 主色调 */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  
  /* 毛玻璃颜色 */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: rgba(0, 0, 0, 0.1);
  
  /* 背景色 */
  --bg-dark: #0f0f1a;
  --bg-card: rgba(30, 30, 50, 0.6);
  --bg-overlay: rgba(15, 15, 26, 0.85);
  
  /* 文字颜色 */
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  
  /* 功能色 */
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  /* 间距系统 */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.4);
  
  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* 字体 */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Poppins', var(--font-primary);
  
  /* 容器宽度 */
  --container-max: 1400px;
  --container-narrow: 800px;
}

/* ==================== 全局重置 ==================== */
*,
*::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-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-dark);
  background-image: 
    radial-gradient(ellipse at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 70%);
  background-attachment: fixed;
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

ul,
ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
}

/* ==================== 容器布局 ==================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--fluid {
  max-width: 100%;
}

/* ==================== 页面头部 ==================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  background: rgba(15, 15, 26, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

.header.scrolled {
  padding: var(--space-sm) 0;
  background: rgba(15, 15, 26, 0.95);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

/* ==================== 导航栏 ==================== */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

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

.nav__link {
  position: relative;
  padding: var(--space-sm) var(--space-md);
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  transform: translateX(-50%);
}

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

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

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: var(--space-sm);
  cursor: pointer;
}

.nav-toggle__bar {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
}

.nav-toggle:hover .nav-toggle__bar {
  background: var(--accent-primary);
}

/* ==================== Hero区域 ==================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(80px + var(--space-3xl)) var(--space-lg) var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: 
    radial-gradient(circle at 30% 40%, rgba(102, 126, 234, 0.3) 0%, transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(118, 75, 162, 0.3) 0%, transparent 40%);
  animation: heroFloat 20s ease-in-out infinite;
  pointer-events: none;
}

@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0) rotate(0deg); }
  25% { transform: translate(2%, -2%) rotate(1deg); }
  50% { transform: translate(0, -4%) rotate(0deg); }
  75% { transform: translate(-2%, -2%) rotate(-1deg); }
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.hero__badge-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero__title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, #ffffff 0%, #e0e0ff 50%, #ffffff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

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

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  animation: bounce 2s infinite;
}

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

.hero__scroll-icon {
  width: 24px;
  height: 40px;
  border: 2px solid var(--glass-border);
  border-radius: var(--radius-full);
  position: relative;
}

.hero__scroll-icon::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  width: 4px;
  height: 8px;
  background: var(--text-primary);
  border-radius: var(--radius-full);
  transform: translateX(-50%);
  animation: scrollDown 1.5s infinite;
}

@keyframes scrollDown {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* ==================== 瀑布流网格布局 ==================== */
.masonry {
  padding: var(--space-3xl) 0;
}

.masonry__header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.masonry__title {
  font-size: clamp(2rem, 5vw, 3rem);
  margin-bottom: var(--space-md);
}

.masonry__description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.masonry__grid {
  column-count: 4;
  column-gap: var(--space-lg);
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.masonry__item {
  break-inside: avoid;
  margin-bottom: var(--space-lg);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.6s ease forwards;
}

.masonry__item:nth-child(1) { animation-delay: 0.1s; }
.masonry__item:nth-child(2) { animation-delay: 0.2s; }
.masonry__item:nth-child(3) { animation-delay: 0.15s; }
.masonry__item:nth-child(4) { animation-delay: 0.25s; }
.masonry__item:nth-child(5) { animation-delay: 0.3s; }
.masonry__item:nth-child(6) { animation-delay: 0.35s; }
.masonry__item:nth-child(7) { animation-delay: 0.4s; }
.masonry__item:nth-child(8) { animation-delay: 0.45s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== 卡片组件 ==================== */
.card {
  position: relative;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-slow);
  cursor: pointer;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0) 50%
  );
  pointer-events: none;
  z-index: 1;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  border-color: rgba(102, 126, 234, 0.5);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.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(1.1);
}

.card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(15, 15, 26, 0.9) 0%,
    transparent 50%
  );
  opacity: 0;
  transition: opacity var(--transition-normal);
}

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

.card__content {
  padding: var(--space-lg);
  position: relative;
  z-index: 2;
}

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

.card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  transition: color var(--transition-fast);
}

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

.card__description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-md);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-md);
  border-top: 1px solid var(--glass-border);
}

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

.card__avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
}

.card__author-name {
  font-size: 0.875rem;
  font-weight: 500;
}

.card__date {
  font-size: 0.75rem;
  color: var(--text-muted);
}

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

.card__stat {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.card__stat-icon {
  font-size: 0.875rem;
}

/* 卡片变体 - 特色卡片 */
.card--featured {
  grid-column: span 2;
}

.card--featured .card__title {
  font-size: 1.75rem;
}

/* 卡片变体 - 小卡片 */
.card--small .card__content {
  padding: var(--space-md);
}

.card--small .card__title {
  font-size: 1rem;
}

/* 卡片变体 - 纯文字卡片 */
.card--text-only {
  padding: var(--space-xl);
}

.card--text-only .card__content {
  padding: 0;
}

/* ==================== 按钮样式 ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    rgba(255, 255, 255, 0.2),
    rgba(255, 255, 255, 0)
  );
  opacity: 0;
  transition: opacity var(--transition-fast);
}

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

.btn__icon {
  font-size: 1.125rem;
  transition: transform var(--transition-fast);
}

.btn:hover .btn__icon {
  transform: translateX(4px);
}

/* 主按钮 */
.btn--primary {
  background: var(--primary-gradient);
  color: var(--text-primary);
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(102, 126, 234, 0.6);
}

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

/* 次要按钮 */
.btn--secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

/* 渐变边框按钮 */
.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid transparent;
  background-image: linear-gradient(var(--bg-dark), var(--bg-dark)), var(--primary-gradient);
  background-origin: border-box;
  background-clip: padding-box, border-box;
}

.btn--outline:hover {
  background-image: linear-gradient(rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1)), var(--primary-gradient);
  transform: translateY(-2px);
}

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

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

/* 按钮尺寸 */
.btn--sm {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.875rem;
}

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

.btn--icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
}

/* ==================== 表单元素 ==================== */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

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

.form__label {
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

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

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

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
  background: rgba(255, 255, 255, 0.15);
}

.form__textarea {
  min-height: 150px;
  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 1rem center;
  background-size: 1rem;
  padding-right: 3rem;
}

.form__select option {
  background: var(--bg-dark);
  color: var(--text-primary);
}

/* 输入框变体 - 带图标 */
.form__input-wrapper {
  position: relative;
}

.form__input-icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.125rem;
  pointer-events: none;
  transition: color var(--transition-fast);
}

.form__input-wrapper .form__input {
  padding-left: 3rem;
}

.form__input-wrapper .form__input:focus + .form__input-icon,
.form__input-wrapper:has(.form__input:focus) .form__input-icon {
  color: var(--accent-primary);
}

/* 复选框 & 单选框 */
.form__check,
.form__radio {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
}

.form__check-input,
.form__radio-input {
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.form__radio-input {
  border-radius: 50%;
}

.form__check-input:checked,
.form__radio-input:checked {
  background: var(--primary-gradient);
  border-color: var(--accent-primary);
}

.form__check-input:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 0.75rem;
  font-weight: bold;
}

.form__radio-input:checked::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  background: white;
  border-radius: 50%;
}

/* ==================== 标签组件 ==================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.tag:hover {
  background: rgba(102, 126, 234, 0.2);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.tag--primary {
  background: var(--primary-gradient);
  border-color: transparent;
  color: var(--text-primary);
}

.tag--outline {
  background: transparent;
  border: 1px solid var(--glass-border);
}

/* ==================== 分页组件 ==================== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-2xl) 0;
}

.pagination__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  height: 44px;
  padding: 0 var(--space-md);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.pagination__btn:hover:not(.pagination__btn--active):not(:disabled) {
  background: rgba(102, 126, 234, 0.2);
  border-color: var(--accent-primary);
  color: var(--text-primary);
}

.pagination__btn--active {
  background: var(--primary-gradient);
  border-color: transparent;
  color: var(--text-primary);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

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

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

/* ==================== 加载状态 ==================== */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl);
  gap: var(--space-lg);
}

.loading__spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--glass-border);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading__text {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* 骨架屏 */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--glass-bg) 0%,
    rgba(255, 255, 255, 0.1) 50%,
    var(--glass-bg) 100%
  );
  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: 1rem;
  margin-bottom: var(--space-sm);
}

.skeleton--title {
  height: 1.5rem;
  width: 70%;
  margin-bottom: var(--space-md);
}

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

/* ==================== 模态框 ==================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

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

.modal__backdrop {
  position: absolute;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal__content {
  position: relative;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  box-shadow: var(--shadow-lg);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

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

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

.modal__title {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal__close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.modal__close:hover {
  background: rgba(239, 68, 68, 0.2);
  color: var(--error);
}

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

.modal__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-md);
  padding: var(--space-lg) var(--space-xl);
  border-top: 1px solid var(--glass-border);
}

/* ==================== 工具提示 ==================== */
.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(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 100;
}

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

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

/* ==================== 页脚 ==================== */
.footer {
  padding: var(--space-3xl) 0 var(--space-xl);
  background: rgba(10, 10, 20, 0.8);
  border-top: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-2xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  font-size: 1.5rem;
  margin-bottom: var(--space-md);
}

.footer__description {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

.footer__social {
  display: flex;
  gap: var(--space-sm);
}

.footer__social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.footer__social-link:hover {
  background: var(--primary-gradient);
  border-color: transparent;
  color: var(--text-primary);
  transform: translateY(-2px);
}

.footer__column h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

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

.footer__link {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--glass-border);
}

.footer__copyright {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer__legal {
  display: flex;
  gap: var(--space-lg);
}

.footer__legal-link {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer__legal-link:hover {
  color: var(--text-secondary);
}

/* ==================== 装饰元素 ==================== */
.decor {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

.decor--circle {
  border-radius: 50%;
  background: var(--primary-gradient);
  opacity: 0.1;
}

.decor--blur {
  border-radius: 50%;
  background: var(--accent-primary);
  filter: blur(100px);
}

.decor--gradient {
  border-radius: 50%;
  background: var(--secondary-gradient);
  opacity: 0.2;
}

/* 几何图形 */
.geo {
  position: absolute;
  pointer-events: none;
}

.geo--triangle {
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-bottom: 86px solid var(--accent-primary);
  opacity: 0.1;
}

.geo--ring {
  width: 100px;
  height: 100px;
  border: 3px solid var(--accent-secondary);
  border-radius: 50%;
  opacity: 0.2;
}

.geo--square {
  width: 60px;
  height: 60px;
  border: 2px solid var(--accent-primary);
  opacity: 0.15;
  transform: rotate(45deg);
}

/* ==================== 响应式设计 ==================== */

/* 大屏幕 */
@media (max-width: 1200px) {
  .masonry__grid {
    column-count: 3;
  }
  
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 平板 */
@media (max-width: 992px) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    --space-3xl: 3rem;
  }
  
  .masonry__grid {
    column-count: 2;
  }
  
  .hero__title {
    font-size: clamp(2rem, 6vw, 3.5rem);
  }
  
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
  }
  
  .footer__brand {
    grid-column: span 2;
    max-width: 100%;
    text-align: center;
  }
  
  .footer__social {
    justify-content: center;
  }
}

/* 大手机 */
@media (max-width: 768px) {
  :root {
    --space-lg: 1rem;
    --space-xl: 1.25rem;
    --space-2xl: 1.5rem;
    --space-3xl: 2rem;
  }
  
  /* 导航 */
  .nav__list {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: center;
    gap: var(--space-xl);
    background: var(--bg-overlay);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .nav__list.active {
    opacity: 1;
    visibility: visible;
  }
  
  .nav__link {
    font-size: 1.5rem;
  }
  
  .nav-toggle {
    display: flex;
    z-index: 1001;
  }
  
  .nav-toggle.active .nav-toggle__bar:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
  }
  
  .nav-toggle.active .nav-toggle__bar:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active .nav-toggle__bar:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
  }
  
  /* 瀑布流 */
  .masonry__grid {
    column-count: 2;
    gap: var(--space-md);
  }
  
  .masonry__item {
    margin-bottom: var(--space-md);
  }
  
  /* 卡片 */
  .card__content {
    padding: var(--space-md);
  }
  
  .card__title {
    font-size: 1rem;
  }
  
  .card__description {
    -webkit-line-clamp: 2;
  }
  
  /* Hero */
  .hero {
    padding-top: calc(60px + var(--space-2xl));
  }
  
  .hero__scroll {
    display: none;
  }
  
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero__actions .btn {
    width: 100%;
  }
  
  /* 页脚 */
  .footer__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer__brand {
    grid-column: 1;
  }
  
  .footer__column {
    text-align: center;
  }
  
  .footer__bottom {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }
  
  .footer__legal {
    justify-content: center;
  }
}

/* 小手机 */
@media (max-width: 480px) {
  :root {
    --space-md: 0.75rem;
    --space-lg: 1rem;
  }
  
  .container {
    padding: 0 var(--space-md);
  }
  
  .masonry__grid {
    column-count: 1;
  }
  
  .card--featured {
    grid-column: span 1;
  }
  
  .hero__title {
    font-size: 1.75rem;
  }
  
  .hero__subtitle {
    font-size: 0.9375rem;
  }
  
  .btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.875rem;
  }
  
  .btn--lg {
    padding: var(--space-md) var(--space-xl);
  }
  
  .modal__content {
    margin: var(--space-md);
    border-radius: var(--radius-lg);
  }
  
  .pagination {
    gap: var(--space-xs);
  }
  
  .pagination__btn {
    min-width: 36px;
    height: 36px;
    font-size: 0.875rem;
  }
}

/* ==================== 辅助类 ==================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

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

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

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }

.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); }

.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); }

.py-section { padding: var(--space-3xl) 0; }
.px-section { padding-left: var(--space-lg); padding-right: var(--space-lg); }

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

.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;
}

/* 打印样式 */
@media print {
  body {
    background: white;
    color: black;
  }
  
  .header,
  .footer,
  .hero__scroll,
  .decor,
  .geo {
    display: none !important;
  }
  
  .card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}
```