/* Base reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

/* Fluid media */
img, video { max-width: 100%; height: auto; }

/* Focus visibility */
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* Fluid typography for headings */
h1 { font-size: clamp(1.5rem, 1.1rem + 2vw, 2.25rem); }
h2 { font-size: clamp(1.25rem, 1rem + 1.5vw, 1.75rem); }
h3 { font-size: clamp(1.125rem, 0.95rem + 1vw, 1.5rem); }

/* Skip link */
.skip-link { position: absolute; left: 8px; top: -40px; background: var(--color-primary); color: #fff; padding: 8px 12px; border-radius: 6px; z-index: var(--z-overlay); text-decoration: none; }
.skip-link:focus { top: 8px; }

/* Overlay for off-canvas */
.sidebar-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.45); z-index: var(--z-overlay); }