:root {
  --bg-default: #0D0F14;
  --bg-subtle: #151923;
  --bg-surface-low: #11151D;
  --bg-surface-high: #1A2030;
  --bg-inverse: #E7ECF5;
  --fg-on-default: #E7ECF5;
  --fg-on-brand: #FFFFFF;
  --fg-on-accent: #000000;
  --fg-secondary: #A9B3C7;
  --fg-disabled: #7A8597;
  --brand-primary: #2B5DF7;
  --brand-primary-hover: #1338B7;
  --brand-secondary: #12C2A1;
  --brand-secondary-hover: #0B8C73;
  --brand-accent: #FF6A3D;
  --brand-accent-hover: #C43F18;
  --border-color-default: #263042;
  --border-color-subtle: #1E2533;
  --border-color-strong: #35415A;
  --color-error: #E3474B;
  --color-warning: #F5B700;
  --color-info: #2B5DF7;
  --color-success: #2FBF71;

  --font-display-lg-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-display-lg-size: clamp(2.2rem, 4vw, 3rem);
  --font-display-lg-weight: 700;
  --font-display-lg-line-height: 1.15;
  --font-display-lg-letter-spacing: -0.03em;
  --font-display-md-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-display-md-size: 2.25rem;
  --font-display-md-weight: 700;
  --font-display-md-line-height: 1.15;
  --font-display-md-letter-spacing: -0.025em;
  --font-headline-lg-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-headline-lg-size: clamp(1.8rem, 3vw, 2.25rem);
  --font-headline-lg-weight: 700;
  --font-headline-lg-line-height: 1.15;
  --font-headline-lg-letter-spacing: -0.02em;
  --font-headline-md-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-headline-md-size: clamp(1.5rem, 2.2vw, 1.9rem);
  --font-headline-md-weight: 700;
  --font-headline-md-line-height: 1.15;
  --font-headline-md-letter-spacing: -0.02em;
  --font-headline-sm-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-headline-sm-size: 1.375rem;
  --font-headline-sm-weight: 700;
  --font-headline-sm-line-height: 1.15;
  --font-headline-sm-letter-spacing: -0.015em;
  --font-title-lg-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-title-lg-size: 1.125rem;
  --font-title-lg-weight: 600;
  --font-title-lg-line-height: 1.15;
  --font-title-lg-letter-spacing: -0.01em;
  --font-title-md-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-title-md-size: 1rem;
  --font-title-md-weight: 600;
  --font-title-md-line-height: 1.15;
  --font-title-md-letter-spacing: -0.01em;
  --font-body-lg-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-body-lg-size: 1.125rem;
  --font-body-lg-weight: 400;
  --font-body-lg-line-height: 1.7;
  --font-body-lg-letter-spacing: 0em;
  --font-body-md-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-body-md-size: 1.0625rem;
  --font-body-md-weight: 400;
  --font-body-md-line-height: 1.7;
  --font-body-md-letter-spacing: 0em;
  --font-body-sm-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-body-sm-size: 0.875rem;
  --font-body-sm-weight: 400;
  --font-body-sm-line-height: 1.7;
  --font-body-sm-letter-spacing: 0em;
  --font-label-lg-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-label-lg-size: 0.9375rem;
  --font-label-lg-weight: 600;
  --font-label-lg-line-height: 1.2;
  --font-label-lg-letter-spacing: 0.01em;
  --font-label-md-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-label-md-size: 0.875rem;
  --font-label-md-weight: 600;
  --font-label-md-line-height: 1.2;
  --font-label-md-letter-spacing: 0.01em;
  --font-label-sm-family: 'Montserrat', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-label-sm-size: 0.75rem;
  --font-label-sm-weight: 600;
  --font-label-sm-line-height: 1.2;
  --font-label-sm-letter-spacing: 0.02em;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2.5rem;
  --spacing-container-padding: 1.25rem;
  --spacing-section-margin: 4rem;

  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.875rem;
  --border-radius-xl: 1.25rem;
  --border-radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.22);
  --shadow-md: 0 6px 18px rgba(0,0,0,0.26);
  --shadow-lg: 0 14px 36px rgba(0,0,0,0.32);

  --container-max-width: 1280px;
  --container-padding-x: 1.25rem;

/* Aliases legacy — pour blocs créés avant migration DESIGN.md */
  --color-primary: var(--brand-primary);
  --color-primary-main: var(--brand-primary);
  --color-primary-light: var(--brand-primary);
  --color-primary-dark: var(--brand-primary-hover);
  --color-primary-contrast: var(--fg-on-brand);
  --color-secondary: var(--brand-secondary);
  --color-secondary-main: var(--brand-secondary);
  --color-secondary-light: var(--brand-secondary);
  --color-secondary-dark: var(--brand-secondary-hover);
  --color-secondary-contrast: var(--fg-on-brand);
  --color-accent: var(--brand-accent);
  --color-accent-main: var(--brand-accent);
  --color-accent-light: var(--brand-accent);
  --color-accent-dark: var(--brand-accent-hover);
  --color-accent-contrast: var(--fg-on-accent);
  --color-background: var(--bg-default);
  --color-background-default: var(--bg-default);
  --color-background-paper: var(--bg-subtle);
  --color-paper: var(--bg-subtle);
  --color-text-primary: var(--fg-on-default);
  --color-text-secondary: var(--fg-secondary);
  --color-text-disabled: var(--fg-disabled);
  --font-family-body: var(--font-body-md-family);
  --font-family-heading: var(--font-headline-lg-family);
  --font-size-base: var(--font-body-md-size);
  --font-size-small: var(--font-body-sm-size);
  --font-size-h1: var(--font-display-lg-size);
  --font-size-h2: var(--font-headline-lg-size);
  --font-size-h3: var(--font-headline-md-size);
  --font-size-h4: var(--font-headline-sm-size);
  --font-size-h5: var(--font-title-lg-size);
  --font-size-h6: var(--font-title-md-size);
  --line-height-body: var(--font-body-md-line-height);
  --line-height-heading: var(--font-headline-lg-line-height);
  --border-radius: var(--border-radius-md);
  --heading-letter-spacing: var(--font-headline-lg-letter-spacing);
  --heading-weight: var(--font-headline-lg-weight);
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
}

[data-theme="dark"] {
  --bg-default: #0B0D12;
  --bg-subtle: #121723;
  --bg-surface-low: #0F1420;
  --bg-surface-high: #171D2B;
  --bg-inverse: #E7ECF5;
  --fg-on-default: #E7ECF5;
  --fg-on-brand: #FFFFFF;
  --fg-on-accent: #000000;
  --fg-secondary: #A9B3C7;
  --fg-disabled: #7A8597;
  --brand-primary: #2B5DF7;
  --brand-primary-hover: #1338B7;
  --brand-secondary: #12C2A1;
  --brand-secondary-hover: #0B8C73;
  --brand-accent: #FF6A3D;
  --brand-accent-hover: #C43F18;
  --border-color-default: #263042;
  --border-color-subtle: #1E2533;
  --border-color-strong: #35415A;
  --color-error: #E3474B;
  --color-warning: #F5B700;
  --color-info: #2B5DF7;
  --color-success: #2FBF71;
}

.block--tone-inverse {
  --bg-default: var(--bg-inverse);
  --bg-subtle: var(--bg-inverse);
  --bg-surface-low: var(--bg-inverse);
  --bg-surface-high: var(--bg-inverse);
  --bg-brand: var(--bg-inverse);
  --bg-accent: var(--bg-inverse);
  --fg-on-default: var(--fg-on-inverse);
  --fg-on-subtle: var(--fg-on-inverse);
  --fg-on-brand: var(--fg-on-inverse);
  --fg-on-accent: var(--fg-on-inverse);
  --fg-secondary: color-mix(in srgb, var(--fg-on-inverse) 72%, transparent);
  --fg-disabled: color-mix(in srgb, var(--fg-on-inverse) 45%, transparent);
  --border-color-default: color-mix(in srgb, var(--fg-on-inverse) 18%, transparent);
  --border-color-subtle: color-mix(in srgb, var(--fg-on-inverse) 8%, transparent);
  --border-color-strong: color-mix(in srgb, var(--fg-on-inverse) 36%, transparent);
}

.block--tone-shell-inverse [class$="__shell"],
.block--tone-shell-inverse [class*="__shell "] {
  --bg-default: var(--bg-inverse);
  --bg-subtle: var(--bg-inverse);
  --bg-surface-low: var(--bg-inverse);
  --bg-surface-high: var(--bg-inverse);
  --bg-brand: var(--bg-inverse);
  --bg-accent: var(--bg-inverse);
  --fg-on-default: var(--fg-on-inverse);
  --fg-on-subtle: var(--fg-on-inverse);
  --fg-on-brand: var(--fg-on-inverse);
  --fg-on-accent: var(--fg-on-inverse);
  --fg-secondary: color-mix(in srgb, var(--fg-on-inverse) 72%, transparent);
  --fg-disabled: color-mix(in srgb, var(--fg-on-inverse) 45%, transparent);
  --border-color-default: color-mix(in srgb, var(--fg-on-inverse) 18%, transparent);
  --border-color-subtle: color-mix(in srgb, var(--fg-on-inverse) 8%, transparent);
  --border-color-strong: color-mix(in srgb, var(--fg-on-inverse) 36%, transparent);
}

.block--tone-brand {
  --bg-default: var(--bg-brand);
  --bg-subtle: var(--bg-brand);
  --bg-surface-low: var(--bg-brand);
  --bg-surface-high: var(--bg-brand);
  --bg-inverse: var(--bg-brand);
  --bg-accent: var(--bg-brand);
  --fg-on-default: var(--fg-on-brand);
  --fg-on-subtle: var(--fg-on-brand);
  --fg-on-inverse: var(--fg-on-brand);
  --fg-on-accent: var(--fg-on-brand);
  --fg-secondary: color-mix(in srgb, var(--fg-on-brand) 72%, transparent);
  --fg-disabled: color-mix(in srgb, var(--fg-on-brand) 45%, transparent);
  --border-color-default: color-mix(in srgb, var(--fg-on-brand) 18%, transparent);
  --border-color-subtle: color-mix(in srgb, var(--fg-on-brand) 8%, transparent);
  --border-color-strong: color-mix(in srgb, var(--fg-on-brand) 36%, transparent);
}

.block--tone-shell-brand [class$="__shell"],
.block--tone-shell-brand [class*="__shell "] {
  --bg-default: var(--bg-brand);
  --bg-subtle: var(--bg-brand);
  --bg-surface-low: var(--bg-brand);
  --bg-surface-high: var(--bg-brand);
  --bg-inverse: var(--bg-brand);
  --bg-accent: var(--bg-brand);
  --fg-on-default: var(--fg-on-brand);
  --fg-on-subtle: var(--fg-on-brand);
  --fg-on-inverse: var(--fg-on-brand);
  --fg-on-accent: var(--fg-on-brand);
  --fg-secondary: color-mix(in srgb, var(--fg-on-brand) 72%, transparent);
  --fg-disabled: color-mix(in srgb, var(--fg-on-brand) 45%, transparent);
  --border-color-default: color-mix(in srgb, var(--fg-on-brand) 18%, transparent);
  --border-color-subtle: color-mix(in srgb, var(--fg-on-brand) 8%, transparent);
  --border-color-strong: color-mix(in srgb, var(--fg-on-brand) 36%, transparent);
}

.block--tone-accent {
  --bg-default: var(--bg-accent);
  --bg-subtle: var(--bg-accent);
  --bg-surface-low: var(--bg-accent);
  --bg-surface-high: var(--bg-accent);
  --bg-inverse: var(--bg-accent);
  --bg-brand: var(--bg-accent);
  --fg-on-default: var(--fg-on-accent);
  --fg-on-subtle: var(--fg-on-accent);
  --fg-on-inverse: var(--fg-on-accent);
  --fg-on-brand: var(--fg-on-accent);
  --fg-secondary: color-mix(in srgb, var(--fg-on-accent) 72%, transparent);
  --fg-disabled: color-mix(in srgb, var(--fg-on-accent) 45%, transparent);
  --border-color-default: color-mix(in srgb, var(--fg-on-accent) 18%, transparent);
  --border-color-subtle: color-mix(in srgb, var(--fg-on-accent) 8%, transparent);
  --border-color-strong: color-mix(in srgb, var(--fg-on-accent) 36%, transparent);
}

.block--tone-shell-accent [class$="__shell"],
.block--tone-shell-accent [class*="__shell "] {
  --bg-default: var(--bg-accent);
  --bg-subtle: var(--bg-accent);
  --bg-surface-low: var(--bg-accent);
  --bg-surface-high: var(--bg-accent);
  --bg-inverse: var(--bg-accent);
  --bg-brand: var(--bg-accent);
  --fg-on-default: var(--fg-on-accent);
  --fg-on-subtle: var(--fg-on-accent);
  --fg-on-inverse: var(--fg-on-accent);
  --fg-on-brand: var(--fg-on-accent);
  --fg-secondary: color-mix(in srgb, var(--fg-on-accent) 72%, transparent);
  --fg-disabled: color-mix(in srgb, var(--fg-on-accent) 45%, transparent);
  --border-color-default: color-mix(in srgb, var(--fg-on-accent) 18%, transparent);
  --border-color-subtle: color-mix(in srgb, var(--fg-on-accent) 8%, transparent);
  --border-color-strong: color-mix(in srgb, var(--fg-on-accent) 36%, transparent);
}