:root {
  /* Brand colors */
  --ph-color-primary: #0d9488;
  --ph-color-primary-strong: #0b7f74;
  --ph-color-primary-soft: #99f6e4;
  --ph-color-marketing: #00b074;
  --ph-color-mint-surface: #d9f1ed;

  /* Neutrals */
  --ph-color-text-strong: #111827;
  --ph-color-text-default: #1f2937;
  --ph-color-text-muted: #6b7280;
  --ph-color-border: #e5e7eb;
  --ph-color-border-strong: #cfd6df;
  --ph-color-surface: #ffffff;
  --ph-color-surface-alt: #f8fafc;
  --ph-color-bg: #f3f6f8;

  /* State colors */
  --ph-color-success: #16a34a;
  --ph-color-warning: #f59e0b;
  --ph-color-danger: #dc2626;
  --ph-color-info: #0ea5e9;

  /* Typography */
  --ph-font-family-base: "Source Sans Pro", "Inter", "Segoe UI", Arial, sans-serif;
  --ph-font-size-xs: 12px;
  --ph-font-size-sm: 13px;
  --ph-font-size-md: 14px;
  --ph-font-size-lg: 16px;
  --ph-font-size-xl: 20px;
  --ph-font-weight-normal: 400;
  --ph-font-weight-medium: 500;
  --ph-font-weight-semibold: 600;
  --ph-font-weight-bold: 700;

  /* Spacing scale */
  --ph-space-1: 4px;
  --ph-space-2: 8px;
  --ph-space-3: 12px;
  --ph-space-4: 16px;
  --ph-space-5: 20px;
  --ph-space-6: 24px;
  --ph-space-8: 32px;

  /* Radius */
  --ph-radius-sm: 6px;
  --ph-radius-md: 10px;
  --ph-radius-lg: 14px;
  --ph-radius-pill: 999px;

  /* Elevation */
  --ph-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --ph-shadow-md: 0 6px 18px rgba(15, 23, 42, 0.08);
  --ph-shadow-lg: 0 12px 26px rgba(15, 23, 42, 0.12);

  /* Legacy bridge aliases for incremental migration */
  --ph-legacy-header-bg: #141414;
  --ph-legacy-surface: #ffffff;
}