/* ============================================
   Aprende por Rutas — Styles
   Mobile-first, responsive, WCAG 2.1 AA
   ============================================ */

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

:root {
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: #a5b4fc;
  --color-accent: #fbbf24;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-basico: #22c55e;
  --color-intermedio: #f59e0b;
  --color-avanzado: #ef4444;
  --color-gratis: #10b981;
  --color-freemium: #6366f1;
  --color-open-source: #0ea5e9;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.1), 0 4px 6px rgba(0,0,0,.05);
  --max-width: 1200px;
  --transition: .2s ease;
}

html { scroll-behavior: smooth; scroll-padding-top: 140px; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover, a:focus-visible { color: var(--color-primary-dark); }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; border-radius: 2px; }

img { max-width: 100%; height: auto; }
ul, ol { list-style: none; }

.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: absolute; top: -100%; left: 16px;
  background: var(--color-primary); color: #fff;
  padding: 8px 16px; border-radius: var(--radius-sm);
  z-index: 1000; font-weight: 600;
}
.skip-link:focus { top: 8px; color: #fff; }

/* --- Ad Slots --- */
.ad-slot {
  min-height: 0; text-align: center;
  margin: 16px auto; max-width: var(--max-width);
}
.ad-slot:empty { display: none; }

/* --- Header --- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 20px;
}

.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-primary);
  display: flex; align-items: center; gap: 8px;
}

.site-title-emoji { font-size: 1.4em; }

.site-subtitle {
  font-size: .875rem;
  color: var(--color-text-muted);
  flex-basis: 100%;
}

.header-stats {
  margin-left: auto;
  font-size: .8rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
  font-weight: 600;
}

/* --- Search --- */
.search-container {
  position: relative;
  margin-bottom: 8px;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  border: 2px solid var(--color-border);
  border-radius: 999px;
  font-size: .95rem;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition);
}
.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,.15);
}
.search-input::placeholder { color: var(--color-text-muted); }

.search-icon {
  position: absolute; left: 14px; top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  pointer-events: none;
  width: 18px; height: 18px;
}

.search-clear {
  position: absolute; right: 10px; top: 50%;
  transform: translateY(-50%);
  background: none; border: none;
  color: var(--color-text-muted);
  cursor: pointer; padding: 4px;
  display: none; font-size: 1.1rem;
  line-height: 1;
}
.search-clear.visible { display: block; }

/* --- Nav Rutas --- */
.nav-rutas {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--color-primary-light) transparent;
  padding-bottom: 4px;
}
.nav-rutas::-webkit-scrollbar { height: 4px; }
.nav-rutas::-webkit-scrollbar-thumb { background: var(--color-primary-light); border-radius: 2px; }

.nav-rutas-list {
  display: flex;
  gap: 6px;
  padding: 2px 0;
}

.nav-ruta-btn {
  flex-shrink: 0;
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
}
.nav-ruta-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-ruta-btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.nav-ruta-btn.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* --- Main Content --- */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* --- Ruta Section --- */
.ruta-section {
  margin-bottom: 48px;
  scroll-margin-top: 160px;
}

.ruta-header {
  margin-bottom: 20px;
}

.ruta-title {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 6px;
}

.ruta-emoji { font-size: 1.3em; }

.ruta-descripcion {
  color: var(--color-text-muted);
  font-size: .95rem;
  margin-bottom: 8px;
}

.ruta-objetivo {
  font-size: .85rem;
  color: var(--color-text-muted);
  padding: 8px 14px;
  background: rgba(99,102,241,.06);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* --- Nivel Section --- */
.nivel-section { margin-bottom: 28px; }

.nivel-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--color-border);
}

.nivel-title {
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: capitalize;
}

.nivel-count {
  font-size: .75rem;
  color: var(--color-text-muted);
  background: var(--color-bg);
  padding: 2px 10px;
  border-radius: 999px;
}

.nivel-bar {
  width: 60px; height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
  margin-left: auto;
}
.nivel-bar-fill {
  height: 100%;
  border-radius: 2px;
  transition: width .4s ease;
}
.nivel-basico .nivel-bar-fill { background: var(--color-basico); }
.nivel-intermedio .nivel-bar-fill { background: var(--color-intermedio); }
.nivel-avanzado .nivel-bar-fill { background: var(--color-avanzado); }

/* --- Card Grid --- */
.recursos-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

/* --- Resource Card --- */
.recurso-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  transition: all var(--transition);
  position: relative;
}
.recurso-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
  transform: translateY(-1px);
}

.recurso-card.destacado {
  border-left: 3px solid var(--color-accent);
}

.recurso-card-header {
  display: flex; align-items: flex-start;
  gap: 8px; margin-bottom: 8px;
}

.recurso-nombre {
  font-size: .95rem;
  font-weight: 600;
  line-height: 1.3;
}

.recurso-nombre a {
  color: var(--color-text);
  display: inline-flex; align-items: center; gap: 4px;
}
.recurso-nombre a:hover { color: var(--color-primary); }

.recurso-external-icon {
  width: 14px; height: 14px;
  flex-shrink: 0;
  opacity: .5;
}

.recurso-star {
  color: var(--color-accent);
  font-size: .85rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.recurso-descripcion {
  font-size: .85rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  line-height: 1.5;
}

.recurso-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.badge {
  display: inline-flex; align-items: center;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.badge-nivel-basico { background: rgba(34,197,94,.12); color: #16a34a; }
.badge-nivel-intermedio { background: rgba(245,158,11,.12); color: #d97706; }
.badge-nivel-avanzado { background: rgba(239,68,68,.12); color: #dc2626; }

.badge-acceso-gratis { background: rgba(16,185,129,.12); color: #059669; }
.badge-acceso-freemium { background: rgba(99,102,241,.12); color: #4f46e5; }
.badge-acceso-open-source { background: rgba(14,165,233,.12); color: #0284c7; }

.badge-idioma {
  background: rgba(100,116,139,.1);
  color: var(--color-text-muted);
}

.badge-tiempo {
  background: transparent;
  color: var(--color-text-muted);
  padding-left: 0;
  font-weight: 500;
  font-size: .75rem;
}
.badge-tiempo::before { content: '⏱ '; }

.recurso-notas {
  font-size: .75rem;
  color: var(--color-text-muted);
  margin-top: 8px;
  font-style: italic;
}

/* --- No Results --- */
.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-muted);
}
.no-results-icon { font-size: 3rem; margin-bottom: 12px; }
.no-results-text { font-size: 1.1rem; font-weight: 600; }
.no-results-sub { font-size: .9rem; margin-top: 6px; }

/* --- Footer --- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 30px 20px;
  text-align: center;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 14px;
}

.footer-links a {
  font-size: .85rem;
  color: var(--color-text-muted);
}
.footer-links a:hover { color: var(--color-primary); }

.footer-update {
  font-size: .8rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.footer-suggest {
  font-size: .85rem;
}

/* --- Cookies Banner --- */
.cookies-banner {
  position: fixed; bottom: 0; left: 0; right: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -4px 12px rgba(0,0,0,.1);
  z-index: 999;
  padding: 16px 20px;
  transform: translateY(100%);
  transition: transform .3s ease;
}
.cookies-banner.visible { transform: translateY(0); }

.cookies-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.cookies-text {
  font-size: .85rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}
.cookies-text a { text-decoration: underline; }

.cookies-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}
.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); }

.btn-secondary {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); }

/* --- Legal Pages --- */
.legal-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}
.legal-page h1 {
  font-size: 1.8rem;
  margin-bottom: 24px;
  color: var(--color-primary);
}
.legal-page h2 {
  font-size: 1.25rem;
  margin: 24px 0 10px;
  color: var(--color-text);
}
.legal-page p, .legal-page li {
  font-size: .95rem;
  color: var(--color-text-muted);
  margin-bottom: 10px;
  line-height: 1.7;
}
.legal-page ul { list-style: disc; padding-left: 24px; }
.legal-back {
  display: inline-flex; align-items: center; gap: 6px;
  margin-bottom: 24px; font-weight: 600;
}

/* --- Responsive --- */
@media (min-width: 640px) {
  .recursos-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cookies-inner { flex-direction: row; align-items: center; }
  .cookies-actions { margin-left: auto; flex-shrink: 0; }
  .site-subtitle { flex-basis: auto; }
}

@media (min-width: 960px) {
  .recursos-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .header-inner { padding: 16px 32px; }
  .main-content { padding: 32px 32px 80px; }
  .ruta-title { font-size: 1.75rem; }
  html { scroll-padding-top: 150px; }
  .ruta-section { scroll-margin-top: 170px; }
}

@media (min-width: 1200px) {
  .recursos-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Print --- */
@media print {
  .site-header, .nav-rutas, .cookies-banner, .ad-slot, .search-container { display: none; }
  .main-content { padding: 0; }
  .recurso-card { break-inside: avoid; border: 1px solid #ccc; }
}