:root {
  --primary: #1a73e8;
  --primary-dark: #0d47a1;
  --primary-gradient: linear-gradient(135deg, #1a73e8 0%, #0d47a1 100%);
  --sidebar-bg: #1a237e;
  --sidebar-hover: #283593;
  --sidebar-width: 250px;
  --ink: #333333;
  --ink-muted: #666666;
  --ink-light: #999999;
  --canvas: #ffffff;
  --canvas-bg: #f5f7fa;
  --border: #e0e0e0;
  --border-light: #f0f0f0;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --success: #34a853;
  --warning: #fbbc04;
  --danger: #ea4335;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}