/* =============================================
   TruequeEdu — styles.css
   POUR compliant: contraste, foco, responsive
   ============================================= */

/* ── Variables ── */
:root {
  --blue:        #1D4ED8;
  --blue-dark:   #1e3a8a;
  --blue-light:  #DBEAFE;
  --green:       #059669;
  --green-light: #D1FAE5;
  --amber:       #D97706;
  --amber-light: #FEF3C7;
  --gray-50:     #F9FAFB;
  --gray-100:    #F3F4F6;
  --gray-200:    #E5E7EB;
  --gray-400:    #9CA3AF;
  --gray-600:    #4B5563;
  --gray-900:    #111827;
  --red:         #DC2626;
  --red-light:   #FEE2E2;

  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --shadow-md: 0 4px 24px rgba(0,0,0,.12);
  --transition: 200ms ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  color: var(--gray-900);
  background: #fff;
  line-height: 1.6;
}
img { display: block; max-width: 100%; height: auto; border-radius: var(--radius); }
ul, ol { list-style: none; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Accessibility ── */
.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 (POUR: Operable) */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background: var(--blue);
  color: #fff;
  padding: .75rem 1.25rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 700;
  z-index: 9999;
  transition: top var(--transition);
  text-decoration: none;
}
.skip-link:focus {
  top: 0;
  outline: 3px solid var(--amber);
  outline-offset: 2px;
}

/* Global focus style (POUR: Operable – visible focus) */
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── Layout ── */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.section { padding: 5rem 0; }
.section-alt { background: var(--gray-50); }

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 800;
  text-align: center;
  color: var(--gray-900);
  margin-bottom: .75rem;
}
.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray-600);
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem;
}

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  z-index: 100;
  box-shadow: 0 1px 8px rgba(0,0,0,.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
  color: var(--gray-900);
}
.logo-icon { font-size: 1.5rem; }
.logo-text { font-size: 1.25rem; font-weight: 800; color: var(--blue); }

/* Nav */
.main-nav { display: flex; align-items: center; }
.nav-menu {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: .5rem .85rem;
  border-radius: var(--radius-sm);
  font-size: .95rem;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  min-height: 44px;
}
.nav-link:hover { background: var(--gray-100); color: var(--blue); text-decoration: none; }
.nav-cta {
  background: var(--blue);
  color: #fff !important;
  font-weight: 700;
  margin-left: .5rem;
}
.nav-cta:hover { background: var(--blue-dark); text-decoration: none; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0 10px;
}
.hamburger-line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--gray-900);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border: 2px solid transparent;
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  min-height: 48px;
  min-width: 44px;
  line-height: 1;
}
.btn-primary {
  background: var(--blue);
  color: #fff;
  border-color: var(--blue);
}
.btn-primary:hover { background: var(--blue-dark); border-color: var(--blue-dark); text-decoration: none; color: #fff; }
.btn-secondary {
  background: #fff;
  color: var(--blue);
  border-color: var(--blue);
}
.btn-secondary:hover { background: var(--blue-light); text-decoration: none; }
.btn-full { width: 100%; }

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #EFF6FF 0%, #F0FDF4 100%);
  padding: 5rem 0 4rem;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  background: var(--amber-light);
  color: #92400E;
  font-weight: 700;
  font-size: .875rem;
  padding: .25rem .75rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 1rem;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  color: var(--gray-900);
  margin-bottom: 1.25rem;
}
.highlight { color: var(--blue); }
.hero-desc {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: 2rem;
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}
.tag {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: 999px;
  padding: .25rem .875rem;
  font-size: .875rem;
  color: var(--gray-600);
}
.hero-image img { width: 100%; border-radius: var(--radius); box-shadow: var(--shadow-md); }

/* ── Cards grid ── */
.cards-grid {
  display: grid;
  gap: 1.5rem;
}
.two-col { grid-template-columns: repeat(2, 1fr); }
.four-col { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow);
}
.card-highlight {
  border-left: 4px solid var(--blue);
}
.card-icon { font-size: 2.5rem; margin-bottom: 1rem; }
.card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: .75rem; color: var(--gray-900); }
.card p { color: var(--gray-600); line-height: 1.6; }

/* Value banner */
.value-banner {
  margin-top: 2.5rem;
  background: var(--blue-light);
  border-radius: var(--radius);
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.value-text {
  font-size: 1.1rem;
  color: var(--blue-dark);
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
  justify-content: center;
  text-align: center;
}

/* ── Steps ── */
.steps-list {
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 720px;
  margin: 0 auto 3rem;
}
.step {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
}
.step-number {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  background: var(--blue);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
}
.step-body { flex: 1; padding-top: .25rem; }
.step-title { font-size: 1.15rem; font-weight: 700; margin-bottom: .4rem; color: var(--gray-900); }
.step-body p { color: var(--gray-600); }

/* Interaction types */
.interaction-types {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.int-type {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  font-size: .95rem;
  font-weight: 600;
  color: var(--gray-600);
}
.int-icon { font-size: 2.25rem; }

/* ── Services grid ── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.25rem;
}
.service-card {
  background: #fff;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue);
}
.service-icon { font-size: 2.25rem; margin-bottom: .75rem; display: block; }
.service-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: .4rem; color: var(--gray-900); }
.service-card p { font-size: .875rem; color: var(--gray-600); line-height: 1.5; }

/* ── Trueque cards ── */
.trueque-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.75rem 1.5rem;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--amber);
}
.trueque-icon { font-size: 2.5rem; margin-bottom: 1rem; display: block; }
.trueque-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: .75rem; color: var(--gray-900); }
.trueque-card ul { list-style: disc; padding-left: 1.25rem; }
.trueque-card li { font-size: .9rem; color: var(--gray-600); margin-bottom: .25rem; line-height: 1.5; }
.trueque-note {
  margin-top: 2rem;
  display: flex;
  align-items: flex-start;
  gap: .75rem;
  background: var(--amber-light);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  font-size: .95rem;
  color: var(--gray-900);
}

/* ── Tabs (POUR: ARIA tablist) ── */
.tabs-wrapper { max-width: 760px; margin: 0 auto; }
.tabs {
  display: flex;
  gap: .5rem;
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: 2rem;
}
.tab {
  flex: 1;
  padding: .875rem 1.5rem;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-600);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  min-height: 48px;
}
.tab:hover { background: var(--gray-100); color: var(--blue); }
.tab.active, .tab[aria-selected="true"] {
  color: var(--blue);
  border-bottom-color: var(--blue);
  background: var(--blue-light);
}
.tab-panel { display: none; }
.tab-panel.active, .tab-panel:not([hidden]) { display: block; }

/* ── Forms ── */
.registro-form { display: flex; flex-direction: column; gap: 1.25rem; }
.form-row { display: grid; gap: 1.25rem; }
.form-row.two-col { grid-template-columns: 1fr 1fr; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.form-group label {
  font-size: .95rem;
  font-weight: 600;
  color: var(--gray-900);
}
.required { color: var(--red); margin-left: .15rem; }

.form-group input,
.form-group select,
.form-group textarea {
  padding: .75rem 1rem;
  border: 2px solid var(--gray-400);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font);
  color: var(--gray-900);
  background: #fff;
  width: 100%;
  transition: border-color var(--transition), box-shadow var(--transition);
  min-height: 48px;
}
.form-group textarea { min-height: 96px; resize: vertical; }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(29,78,216,.15);
  outline: none;
}
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: var(--red);
  background: var(--red-light);
}
.field-error {
  font-size: .85rem;
  color: var(--red);
  font-weight: 600;
  min-height: 1.25em;
  /* WCAG: no usar display:none — aria-describedby requiere que el elemento
     esté en el árbol de accesibilidad. Se mantiene visible pero vacío. */
  display: block;
}

/* Success message */
.success-msg {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--green-light);
  border: 2px solid var(--green);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin-top: 2rem;
  font-size: 1rem;
  color: var(--gray-900);
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}
.success-msg > span { font-size: 2rem; flex-shrink: 0; }
.success-msg strong { display: block; font-size: 1.1rem; margin-bottom: .25rem; }

/* ── Contact ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}
.contact-card {
  background: var(--gray-50);
  border-radius: var(--radius);
  padding: 2rem;
  font-style: normal;
}
.contact-list { display: flex; flex-direction: column; gap: 1.25rem; }
.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.contact-icon { font-size: 1.5rem; flex-shrink: 0; margin-top: .1rem; }
.contact-list div { display: flex; flex-direction: column; gap: .15rem; }
.contact-list strong { font-size: .95rem; color: var(--gray-900); }
.contact-list span, .contact-list a { font-size: 1rem; color: var(--gray-600); }

/* ── Footer ── */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-400);
  padding: 3rem 0 2rem;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  text-align: center;
}
.footer-brand { display: flex; flex-direction: column; align-items: center; gap: .25rem; }
.footer-brand .logo-text { color: #fff; font-size: 1.3rem; }
.footer-brand p { font-size: .9rem; color: var(--gray-400); }
.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .5rem 1.5rem;
}
.footer-links a { color: var(--gray-400); font-size: .95rem; text-decoration: none; transition: color var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-credit { font-size: .85rem; color: var(--gray-400); }

/* =============================================
   RESPONSIVE
   ============================================= */

@media (max-width: 900px) {
  /* Nav collapse */
  .hamburger { display: flex; }
  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0; right: 0;
    background: #fff;
    border-bottom: 2px solid var(--gray-200);
    flex-direction: column;
    padding: 1rem;
    gap: .25rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-120%);
    transition: transform var(--transition);
    pointer-events: none;
  }
  .nav-menu.open {
    transform: translateY(0);
    pointer-events: all;
  }
  .nav-link { width: 100%; justify-content: flex-start; }
  .nav-cta { margin-left: 0; margin-top: .25rem; justify-content: center; }

  /* Hero */
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin: 0 auto 2rem; }
  .hero-actions { justify-content: center; }
  .hero-tags { justify-content: center; }
  .hero-image { display: none; }

  /* Grids */
  .two-col { grid-template-columns: 1fr; }
  .four-col { grid-template-columns: repeat(2, 1fr); }
  .form-row.two-col { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-img { display: none; }
}

@media (max-width: 600px) {
  .section { padding: 3.5rem 0; }
  .four-col { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-list { gap: 1.25rem; }
  .step-number { width: 44px; height: 44px; font-size: 1.25rem; }
  .hero { padding: 3rem 0 2.5rem; }
  .tabs { flex-direction: column; border-bottom: none; gap: .5rem; }
  .tab { border-radius: var(--radius-sm); border: 2px solid var(--gray-200); border-bottom: 2px solid var(--gray-200); margin: 0; }
  .tab.active { border-color: var(--blue); border-bottom-color: var(--blue); }
  .interaction-types { gap: 1rem; }
}

@media (max-width: 400px) {
  .services-grid { grid-template-columns: 1fr; }
}

/* ── prefers-reduced-motion (WCAG 2.3.3) ── */
/* Para usuarios sensibles al movimiento (migrañas, vértigo, epilepsia) */
@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;
  }
  html { scroll-behavior: auto; }
  .service-card:hover { transform: none; }
}

/* ── Print ── */
@media print {
  .site-header, .hamburger, .skip-link, .hero-image { display: none; }
  .hero { background: none; }
  .section-alt { background: none; }
  a[href]::after { content: " (" attr(href) ")"; font-size: .8rem; color: #666; }
}