/* ==========================================================================
   Base: reset, tipografía, accesibilidad
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(900px 480px at 85% -5%, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 70%),
    radial-gradient(800px 460px at -5% 8%, color-mix(in srgb, var(--accent) 14%, transparent), transparent 70%),
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: auto, auto, 40px 40px, 40px 40px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p, ul, ol, dl, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; cursor: pointer; }
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

h1, h2, h3, h4 { line-height: 1.2; letter-spacing: -0.01em; }

::selection { background: color-mix(in srgb, var(--accent) 35%, transparent); }

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

[hidden] { display: none !important; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed; top: 8px; left: 8px; z-index: 100;
  padding: .6rem 1rem; border-radius: var(--radius-sm);
  background: var(--accent); color: var(--accent-ink); font-family: var(--font-mono); font-weight: 700;
  transform: translateY(-200%);
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus { transform: none; text-decoration: none; }

.noscript { padding: 1rem; text-align: center; font-family: var(--font-mono); }

/* Scrollbar discreto */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0s !important;
  }
}