/* version: 1.0.0
   Shared structural design tokens for ForgeScene web UI.
   Linked before style.css and theme sheets in templates.
   Color palette and theme accents live in style.css :root + static/css/themes/*.css. */

:root {
    /* Spacing — 4px base unit */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;

    /* Lab parity aliases */
    --fs-space-xs: var(--spacing-xs);
    --fs-space-sm: var(--spacing-sm);
    --fs-space-md: var(--spacing-md);
    --fs-space-lg: var(--spacing-lg);
    --fs-space-xl: var(--spacing-xl);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-snug: 1.375;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;

    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;
    --card-radius: var(--radius-lg);

    /* Elevation shadows (accent glows stay in style.css / themes) */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);

    /* Motion */
    --duration-instant: 50ms;
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;
    --duration-slower: 600ms;

    --ease-linear: linear;
    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

    --transition-fast: 0.15s var(--ease-out);
    --transition-base: 0.25s var(--ease-out);
    --transition-slow: 0.4s var(--ease-out);

    /* Z-index scale */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;

    /* Layout */
    --fs-topbar-h: 56px;
    --fs-content-max: 1400px;
    --fs-sidebar-w: 280px;
    --sidebar-width: 54px;

    /* Focus ring (uses theme accent when available) */
    --fs-focus-ring: 0 0 0 3px var(--border-focus, rgba(200, 164, 92, 0.5));
}

@media (prefers-reduced-motion: reduce) {
    :root {
        --duration-instant: 0.01ms;
        --duration-fast: 0.01ms;
        --duration-normal: 0.01ms;
        --duration-slow: 0.01ms;
        --duration-slower: 0.01ms;
        --transition-fast: 0.01ms linear;
        --transition-base: 0.01ms linear;
        --transition-slow: 0.01ms linear;
    }
}