:root {
  /* Colors */
  --color-paper-white: #ffffff;
  --color-charcoal: #1f2025;
  --color-ink: #222326;
  --color-cloud-card: #ebf0f8;
  --color-body-gray: #747679;
  --color-signal-gold: #ffca00;
  --color-coral-signal: #ffab94;
  --color-recovery-green: #31ce01;
  --color-metric-blue: #415eee;
  --color-sleep-lilac: #b9a6ff;
  --color-hero-sky: #d2e5ff;
  --gradient-hero-sky: linear-gradient(#d2e5ff, #fff9ee);

  /* Typography — Font Families */
  --font-apple-system-blinkmacsystemfont-inter-segoe-ui-sans-serif: '-apple-system, BlinkMacSystemFont, Inter, "Segoe UI", sans-serif', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Typography — Scale */
  --text-caption: 12px;
  --leading-caption: 1.1;
  --tracking-caption: 0px;
  --text-nav: 16px;
  --leading-nav: 1.4;
  --tracking-nav: 0px;
  --text-brand-nav: 18px;
  --leading-brand-nav: 1.4;
  --tracking-brand-nav: 0.162px;
  --text-body: 24px;
  --leading-body: 1.3;
  --tracking-body: 0px;
  --text-section-label: 24px;
  --leading-section-label: 0.9;
  --tracking-section-label: -0.24px;
  --text-card-heading: 40px;
  --leading-card-heading: 1;
  --tracking-card-heading: -1.2px;
  --text-display: 64px;
  --leading-display: 1;
  --tracking-display: -1.92px;
  --text-hero-display: 80px;
  --leading-hero-display: 1;
  --tracking-hero-display: -2.4px;

  /* Typography — Weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Spacing */
  --spacing-unit: 8px;
  --spacing-8: 8px;
  --spacing-16: 16px;
  --spacing-24: 24px;
  --spacing-32: 32px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-80: 80px;
  --spacing-96: 96px;
  --spacing-160: 160px;

  /* Layout */
  --section-gap: 80px;
  --card-padding: 32px;
  --element-gap: 16px;

  /* Border Radius */
  --radius-2xl: 16px;
  --radius-3xl: 24px;
  --radius-3xl-2: 32px;
  --radius-full: 128px;
  --radius-full-2: 9999px;

  /* Named Radii */
  --radius-cards: 24-32px;
  --radius-pills: 9999px;
  --radius-images: 16-24px;
  --radius-buttons: 128px;
  --radius-navigation: 32px;

  /* Shadows */
  --shadow-md: rgba(0, 0, 0, 0.25) 0px 0px 16px -8px;
  --shadow-subtle: rgb(255, 255, 255) 0px 1px 0px 0px inset, rgba(255, 255, 255, 0.25) 0px 0px 4px 0px inset;
  --shadow-lg: rgb(255, 255, 255) 0px 0px 24px 0px inset;
  --shadow-md-2: rgba(0, 0, 0, 0.15) 0px 2px 16px 0px;
  --shadow-subtle-2: rgba(255, 255, 255, 0.36) 0px 1px 0px 0px inset;

  /* Surfaces */
  --surface-paper-white: #ffffff;
  --surface-cloud-card: #ebf0f8;
  --surface-charcoal: #1f2025;
}