/* ============================================================
   BASE.CSS — Reset, tipografía global y utilidades
   Depende de: variables.css
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

/* ── Tipografía ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--text-h1); letter-spacing: -0.02em; }
h2 { font-size: var(--text-h2); letter-spacing: -0.01em; }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-h4); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

a {
  color: var(--color-secondary);
  transition: color var(--transition-fast);
}

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

img, svg {
  display: block;
  max-width: 100%;
}

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ── Layout base ── */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-2xl) 0;
}

.section--alt {
  background-color: var(--bg-secondary);
}

.section--dark {
  background: linear-gradient(135deg, var(--gray-900), var(--gray-800));
  color: white;
}

.section--dark h2,
.section--dark p {
  color: rgba(255, 255, 255, 0.9);
}

/* ── Utilidades de texto ── */
.text-center  { text-align: center; }
.text-right   { text-align: right; }
.text-primary { color: var(--color-primary); }
.text-secondary-color { color: var(--color-secondary); }
.text-muted   { color: var(--text-muted); }

/* ── Utilidades de espaciado ── */
.mt-xs  { margin-top: var(--spacing-xs); }
.mt-sm  { margin-top: var(--spacing-sm); }
.mt-md  { margin-top: var(--spacing-md); }
.mt-lg  { margin-top: var(--spacing-lg); }
.mb-sm  { margin-bottom: var(--spacing-sm); }
.mb-md  { margin-bottom: var(--spacing-md); }
.mb-lg  { margin-bottom: var(--spacing-lg); }

/* Alias históricos */
.mt-xs  { margin-top: var(--spacing-xs); }
.mt-1   { margin-top: var(--spacing-sm); }
.mt-2   { margin-top: var(--spacing-md); }
.mt-3   { margin-top: var(--spacing-lg); }
.mb-1   { margin-bottom: var(--spacing-sm); }
.mb-2   { margin-bottom: var(--spacing-md); }
.mb-3   { margin-bottom: var(--spacing-lg); }

/* ── Grid genérico ── */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ── Animaciones ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in-up {
  animation: fadeInUp 0.5s ease-out both;
}

/* ── Estado deshabilitado ── */
.disabled,
[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Accesibilidad: skip link ── */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 9999;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* ── Focus visible global ── */
:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}