/* ============================================================================
 * base.css — Reset + estilos base mobile-first
 * Pilar 7: Accesibilidad WCAG AA innegociable
 * ============================================================================ */

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

html {
  font-size: 16px;        /* Base 16px obligatorio para evitar zoom auto iOS */
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--charcoal);
  background: var(--white-warm);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--charcoal);
  letter-spacing: -0.01em;
}

h1 { font-size: 32px; }
h2 { font-size: 24px; }
h3 { font-size: 20px; }
h4 { font-size: 18px; }

/* Links */
a {
  color: var(--green-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--duration-fast);
}
a:hover { color: var(--green-deep); }
a:focus-visible {
  outline: 2px solid var(--green-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Buttons base — touch targets WCAG */
button {
  font-family: inherit;
  font-size: inherit;
  min-height: var(--touch-min);
  min-width: var(--touch-min);
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}
button:focus-visible {
  outline: 2px solid var(--green-primary);
  outline-offset: 2px;
}

/* Inputs base */
input, textarea, select {
  font-family: inherit;
  font-size: 16px;        /* 16px = no zoom auto iOS */
  min-height: var(--touch-min);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--gray-mist);
  border-radius: var(--radius-md);
  background: var(--white-warm);
  color: var(--charcoal);
  width: 100%;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}
input:focus-visible, textarea:focus-visible, select:focus-visible {
  outline: none;
  border-color: var(--green-primary);
  box-shadow: var(--shadow-glow-green);
}

/* Imágenes responsive */
img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Skip link (Pilar 7 — accesibilidad) */
.skip-link {
  position: absolute;
  left: -9999px;
  top: var(--space-2);
  background: var(--charcoal);
  color: var(--white-warm);
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-toast);
}
.skip-link:focus { left: var(--space-2); }

/* Screen reader only */
.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;
}

/* Container helpers */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container { padding: 0 var(--space-6); }
}

/* Mobile-first respeta animaciones del usuario */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}