/* ==========================================================================
   DR. KAVISH SHARMA — BASE RESET & ACCESSIBILITY NORMALIZATION
   Phase 3 Global Shell Reset Rules
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: var(--font-size-body);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-background);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Scroll Lock when Mobile Navigation Drawer is Active */
body.scroll-locked {
  overflow: hidden !important;
}

/* Accessibility Skip-to-Content Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  background-color: var(--color-primary-dark);
  color: var(--color-white) !important;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  z-index: 10000;
  box-shadow: var(--shadow-lg);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 16px;
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

img, picture, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-heading);
  margin-top: 0;
}

/* Accessibility Focus States, Screen Reader Utilities & Reduced Motion */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 3px;
  box-shadow: 0 0 0 4px var(--color-primary-glow);
}

/* Fallback visible focus state for older browsers */
:focus:not(:focus-visible) {
  outline: none;
}

/* Screen Reader Only Utility Class */
.sr-only,
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

/* Ensure accessible minimum touch target sizing for interactive controls on touch devices */
@media (pointer: coarse) {
  a, button, input[type="submit"], input[type="button"], input[type="reset"], select, .nav-link, .btn-medical {
    min-height: 44px;
    min-width: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-aos] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}