*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
* { -webkit-tap-highlight-color: transparent; }
button, a, label { touch-action: manipulation; }

/* Design tokens not overridden per theme (semantic, cross-theme constants) */
:root {
    --error-bg:     rgba(220,38,38,0.12);
    --error-border: rgba(220,38,38,0.38);
    --error-text:   #fca5a5;
    --warn-color:   #f59e0b;
}