/* ============================================
   云卡栈 - 高级感UI设计系统
   Premium UI Design System
   ============================================ */

:root {
  /* 主色调 - 深邃蓝 */
  --primary: #1e3a8a;
  --primary-light: #3b82f6;
  --primary-dark: #1e40af;
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  /* 辅助色 */
  --accent: #f59e0b;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;
  
  /* 中性色 */
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --text-inverse: #ffffff;
  
  /* 背景色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  
  /* 边框 */
  --border-light: #e5e7eb;
  --border-medium: #d1d5db;
  
  /* 阴影 - 高级感多层阴影 */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --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-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* 毛玻璃效果 */
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-blur: blur(20px);
  --glass-border: 1px solid rgba(255, 255, 255, 0.3);
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 10px;
  --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;
  
  /* 字体 */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  
  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ============================================
   全局重置
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   高级感卡片
   ============================================ */
.premium-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.premium-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
  border-color: var(--primary-light);
}

.premium-card-glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   高级感按钮
   ============================================ */
.premium-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.premium-btn-primary {
  background: var(--primary-gradient);
  color: var(--text-inverse);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.premium-btn-primary:hover {
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
  transform: translateY(-1px);
}

.premium-btn-primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 10px rgba(102, 126, 234, 0.3);
}

.premium-btn-secondary {
  background: var(--bg-card);
  color: var(--primary);
  border: 1.5px solid var(--primary-light);
}

.premium-btn-secondary:hover {
  background: var(--primary);
  color: var(--text-inverse);
}

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

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

/* ============================================
   高级感渐变文字
   ============================================ */
.gradient-text {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   高级感标签
   ============================================ */
.premium-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
}

.premium-badge-primary {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
  color: var(--primary);
  border: 1px solid rgba(102, 126, 234, 0.2);
}

.premium-badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.premium-badge-warning {
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.premium-badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* ============================================
   高级感输入框
   ============================================ */
.premium-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  background: var(--bg-card);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

.premium-input:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.premium-input::placeholder {
  color: var(--text-tertiary);
}

/* ============================================
   高级感分割线
   ============================================ */
.premium-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-medium), transparent);
  margin: var(--space-md) 0;
}

/* ============================================
   高级感加载动画
   ============================================ */
.premium-loading {
  display: inline-block;
  width: 24px;
  height: 24px;
  border: 2.5px solid rgba(102, 126, 234, 0.2);
  border-top-color: var(--primary-light);
  border-radius: 50%;
  animation: premium-spin 0.8s linear infinite;
}

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

/* ============================================
   高级感骨架屏
   ============================================ */
.premium-skeleton {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-secondary) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: premium-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

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

/* ============================================
   高级感浮动按钮
   ============================================ */
.premium-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: var(--primary-gradient);
  color: white;
  border: none;
  box-shadow: var(--shadow-xl);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.premium-fab:hover {
  transform: scale(1.1) rotate(90deg);
  box-shadow: var(--shadow-2xl);
}

/* ============================================
   高级感导航栏
   ============================================ */
.premium-navbar {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: var(--glass-border);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

/* ============================================
   高级感列表项
   ============================================ */
.premium-list-item {
  display: flex;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.premium-list-item:hover {
  background: var(--bg-secondary);
  padding-left: calc(var(--space-md) + 4px);
}

.premium-list-item:last-child {
  border-bottom: none;
}

/* ============================================
   高级感头像
   ============================================ */
.premium-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
  border: 2px solid white;
}

/* ============================================
   高级感进度条
   ============================================ */
.premium-progress {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.premium-progress-bar {
  height: 100%;
  background: var(--primary-gradient);
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
  box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

/* ============================================
   响应式优化
   ============================================ */
@media (max-width: 768px) {
  .premium-card:hover {
    transform: none;
  }
  
  .premium-btn {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-xs);
  }
  
  .premium-fab {
    width: 48px;
    height: 48px;
    bottom: 16px;
    right: 16px;
  }
}

/* ============================================
   深色模式支持
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --bg-card: #1f2937;
    --border-light: #374151;
    --glass-bg: rgba(31, 41, 55, 0.7);
  }
}