/* ==========================================================================
   AAD 2026 GATE VALIDATOR — BASE STYLES
   Reset, typography rules, focus outlines, a11y & motion controls
   ========================================================================== */

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

html {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-darkest);
  background-color: var(--surface-page);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--surface-page);
  color: var(--neutral-darkest);
  overflow-x: hidden;
}

/* Typography Rules */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--color-primary);
}


h1 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

h2 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h3 {
  font-size: 1.125rem;
}

p {
  font-weight: 500;
  color: var(--neutral-darkest);
}

/* Monospace & Tabular Data */
code, kbd, samp, pre, .mono, [data-mono] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.tabular-nums {
  font-variant-numeric: tabular-nums;
}

/* Interactive & Accessibility Focus */
:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

/* White inner outline for dark surfaces */
.surface-dark :focus-visible,
header :focus-visible,
.app-sidebar :focus-visible {
  outline: 3px solid var(--color-highlight);
  outline-offset: 2px;
  box-shadow: 0 0 0 1px #ffffff;
}

/* Links & Buttons */
a {
  color: var(--color-primary);
  text-decoration: none;
}

button {
  font-family: var(--font-btn);
  font-weight: 600;
  border: none;
  background: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: background var(--trans-fast), color var(--trans-fast), border-color var(--trans-fast), transform var(--trans-fast);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
  color: var(--neutral-darkest);
  background-color: var(--surface-card);
  border: 1px solid var(--neutral-border);
  border-radius: var(--radius-md);
  padding: var(--space-xs) var(--space-sm);
  transition: border-color var(--trans-fast), box-shadow var(--trans-fast);
}

input:focus, select:focus, textarea:focus {
  border-color: var(--color-primary);
  outline: var(--focus-ring);
  outline-offset: 1px;
}

/* Icons */
.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.75;
  fill: none;
  flex-shrink: 0;
}

/* Screen reader utility */
.sr-only {
  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;
}

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

/* High Contrast Mode */
@media (prefers-contrast: more) {
  :root {
    --neutral-border: #000000;
    --border-hairline: 2px solid #000000;
    --focus-ring: 4px solid #000000;
  }
}