/* css/variables.css - 深度美化升级版 */
:root {
  /* 品牌渐变色 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-primary-hover: linear-gradient(135deg, #5a6fd6 0%, #6a4292 100%);
  --gradient-primary-light: linear-gradient(135deg, rgba(102,126,234,0.08) 0%, rgba(118,75,162,0.08) 100%);
  --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-success: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  --gradient-sky: linear-gradient(135deg, #a18cd1 0%, #fbc2eb 100%);
  --gradient-bg: linear-gradient(160deg, #f0f4ff 0%, #e8ecf4 50%, #f5f0ff 100%);
  --gradient-hero: linear-gradient(135deg, #667eea08 0%, #764ba208 50%, #f093fb05 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(255,255,255,0.6) 100%);

  /* 颜色系统 */
  --color-primary: #667eea;
  --color-primary-hover: #5a6fd6;
  --color-primary-light: rgba(102, 126, 234, 0.08);
  --color-primary-solid: #667eea;
  --color-accent: #764ba2;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-info: #06b6d4;

  /* 背景色 */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-hover: #f8fafc;
  --bg-active: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.72);
  --bg-glass-strong: rgba(255, 255, 255, 0.88);
  --bg-glass-subtle: rgba(255, 255, 255, 0.5);

  /* 文字颜色 */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  --text-link: #667eea;

  /* 边框 */
  --border-color: #e2e8f0;
  --border-color-light: #f1f5f9;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --border-radius-xl: 24px;
  --border-radius-full: 9999px;

  /* 阴影 - 精致多层阴影 */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.15);
  --shadow-glow-strong: 0 0 30px rgba(102, 126, 234, 0.25);
  --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-header: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);

  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;

  /* 字体 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* 动画 */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 布局 */
  --header-height: 64px;
  --sidebar-width: 260px;
  --content-max-width: 1400px;
}

/* 暗色主题 */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f172a;
    --bg-secondary: #020617;
    --bg-tertiary: #1e293b;
    --bg-hover: #1e293b;
    --bg-active: #334155;
    --bg-glass: rgba(15, 23, 42, 0.78);
    --bg-glass-strong: rgba(15, 23, 42, 0.92);
    --bg-glass-subtle: rgba(15, 23, 42, 0.5);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #1e293b;
    --border-color-light: #1e293b;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.4);
    --shadow-header: 0 1px 3px rgba(0, 0, 0, 0.3);
    --gradient-bg: linear-gradient(160deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
    --gradient-hero: linear-gradient(135deg, rgba(102,126,234,0.05) 0%, rgba(118,75,162,0.05) 50%, rgba(240,147,251,0.03) 100%);
    --gradient-card: linear-gradient(135deg, rgba(30,41,59,0.9) 0%, rgba(30,41,59,0.6) 100%);
  }
}