/* Fichas de casos de uso (/use-cases/*): estilos comunes de las 8 páginas.
   Antes cada página llevaba este bloque copiado en un <style> con su propio
   color (rojo, azul, verde, morado…). Ahora todas usan solo los acentos de la
   marca y el aspecto de la ficha de noticia: migas en ámbar, título liso,
   etiquetas, tarjetas de cristal y cajas laterales como .vq-widget.
   Va después de /css/common.css y de viqus-ui.css; los colores salen de sus
   variables, así que el modo claro se resuelve casi solo. */

html { scroll-behavior: smooth; }

/* ── Fondo del hero: brillos de marca ── */
.vu-hero-bg { position: absolute; inset: 0; pointer-events: none; overflow: hidden; z-index: 0; }
.vu-hero-mesh { position: absolute; border-radius: 50%; filter: blur(110px); opacity: 0.07; }
.vu-mesh-1 {
  width: 520px; height: 520px; top: -120px; left: -80px;
  background: radial-gradient(circle, var(--accent) 0%, transparent 70%);
  animation: vu-drift 16s ease-in-out infinite alternate;
}
.vu-mesh-2 {
  width: 360px; height: 360px; top: -40px; right: -50px;
  background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
  animation: vu-drift 20s ease-in-out infinite alternate-reverse;
}
.vu-grid-overlay {
  position: absolute; inset: 0; background-size: 52px 52px;
  background-image:
    linear-gradient(rgba(64,192,192,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(64,192,192,0.025) 1px, transparent 1px);
}
@keyframes vu-drift {
  from { transform: translate(0,0) scale(1); }
  to   { transform: translate(28px,18px) scale(1.07); }
}
.light-mode .vu-mesh-1, .light-mode .vu-mesh-2 { opacity: 0.04; }
.light-mode .vu-grid-overlay {
  background-image:
    linear-gradient(rgba(64,192,192,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(64,192,192,0.035) 1px, transparent 1px);
}

/* ── Migas: como .vq-crumbs ── */
.vu-breadcrumb {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem;
  font-family: var(--vq-font-sans); font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1.5rem;
}
.vu-breadcrumb a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
.vu-breadcrumb a:hover { opacity: 0.7; }
.vu-breadcrumb-sep { opacity: 0.4; }
.vu-breadcrumb-cur { color: var(--text-muted); }

/* ── Enlace de vuelta ── */
.vu-back-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--vq-font-mono); font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted); text-decoration: none;
  padding: 8px 16px; border-radius: 100px; border: 1px solid var(--border);
  transition: all 0.25s var(--vq-ease); margin-bottom: 2rem;
}
.vu-back-link:hover { color: var(--accent); border-color: var(--accent); background: rgba(240,180,79,0.05); }

/* ── Hero ── */
.vu-hero-wrap { position: relative; padding-top: 24px; padding-bottom: 8px; }
.vu-hero-inner { position: relative; z-index: 1; }

/* Icono del sector: como .vq-card-icon--soft */
.vu-industry-icon {
  width: 64px; height: 64px; border-radius: var(--vq-radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px; color: var(--accent);
  background: rgba(240,180,79,0.08); border: 1px solid rgba(240,180,79,0.18);
  margin-bottom: 1.75rem;
}

/* Etiquetas: el sector como .vq-tag--accent, las cifras como .vq-tag */
.vu-badge-row { display: flex; align-items: center; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.5rem; }
.vu-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--vq-font-sans); font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.5px; text-transform: uppercase;
  padding: 0.4rem 0.9rem; border-radius: 2rem; border: 1px solid transparent;
}
.vu-badge-industry { background: rgba(240,180,79,0.1); color: var(--accent); }
.vu-badge-count { background: var(--tag-bg); color: var(--tag-text); }

/* Título liso, como el de la noticia (anula el degradado de .hero-title) */
.vu-hero-title {
  font-family: var(--vq-font-mono);
  font-size: clamp(2rem, 4.5vw, 3.25rem); font-weight: 700;
  line-height: 1.12; letter-spacing: -0.03em;
  margin: 0 0 1.5rem;
  background: none; color: var(--text-primary);
  -webkit-text-fill-color: currentColor;
}
.vu-hero-desc {
  font-family: var(--vq-font-sans); font-size: 1.1rem; line-height: 1.75;
  color: var(--text-secondary); max-width: 720px; margin-bottom: 2.5rem;
}

/* ── Cifras: tarjetas de cristal con el valor en degradado de marca ── */
.vu-stats-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem; margin-bottom: 3rem;
}
.vu-stat-card {
  padding: 1.35rem 1.5rem; text-align: center;
  background: var(--glass-bg); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--border); border-radius: var(--vq-radius-lg);
}
.vu-stat-val {
  font-family: var(--vq-font-mono); font-size: 1.5rem; font-weight: 800; line-height: 1.2;
  margin-bottom: 6px;
  background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.vu-stat-label { font-family: var(--vq-font-sans); font-size: 0.8rem; line-height: 1.5; color: var(--text-muted); }
.vu-stat-source {
  font-family: var(--vq-font-mono); font-size: 0.6rem; letter-spacing: 0.04em;
  color: var(--text-muted); opacity: 0.7; margin-top: 4px;
}

/* ── Dos columnas ── */
.vu-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 3rem; align-items: start; }
@media (max-width: 1024px) {
  .vu-layout { grid-template-columns: minmax(0, 1fr); }
  .vu-sidebar { position: static; }
}

/* ── Secciones ── */
.vu-section { margin-bottom: 3.5rem; scroll-margin-top: 100px; }
.vu-section-header { display: flex; align-items: center; gap: 14px; margin-bottom: 1.25rem; }
.vu-section-icon {
  width: 42px; height: 42px; flex-shrink: 0; border-radius: var(--vq-radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; color: var(--accent);
  background: rgba(240,180,79,0.08); border: 1px solid rgba(240,180,79,0.18);
}
.vu-section-title {
  font-family: var(--vq-font-mono); font-size: 1.35rem; font-weight: 700;
  letter-spacing: -0.02em; color: var(--text-primary); margin: 0;
}
.vu-prose {
  font-family: var(--vq-font-sans); font-size: 1.02rem; line-height: 1.8;
  color: var(--text-secondary); margin-bottom: 1.5rem;
}

/* ── Ejemplos: tarjetas compactas con punto de marca ── */
.vu-examples-grid { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.25rem; }
.vu-example-card {
  display: flex; gap: 16px; align-items: flex-start; padding: 1.1rem 1.4rem;
  background: var(--glass-bg); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--border); border-radius: var(--vq-radius);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.vu-example-card:hover { border-color: var(--accent); box-shadow: var(--shadow-primary); }
.vu-example-marker {
  width: 7px; height: 7px; flex-shrink: 0; border-radius: 50%; margin-top: 0.45rem;
  background: var(--accent-gradient);
}
.vu-example-name {
  font-family: var(--vq-font-mono); font-size: 0.9rem; font-weight: 700;
  color: var(--text-primary); margin-bottom: 4px;
}
.vu-example-detail { font-family: var(--vq-font-sans); font-size: 0.9rem; line-height: 1.65; color: var(--text-muted); }

/* ── Enlaces al glosario: como .vq-tag--sm ── */
.vu-glossary-links { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.vu-glossary-chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--vq-font-sans); font-size: 0.65rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  padding: 4px 11px; border-radius: 2rem; border: 1px solid transparent;
  background: var(--tag-bg); color: var(--tag-text); text-decoration: none;
  transition: all 0.2s;
}
.vu-glossary-chip:hover { border-color: var(--accent-secondary); transform: translateY(-1px); }
.vu-glossary-chip i { font-size: 0.6rem; opacity: 0.75; }

/* ── Retos: tarjetas .vq-card con título en ámbar ── */
.vu-challenges-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem;
}
.vu-challenge-card {
  position: relative; overflow: hidden; padding: 1.35rem 1.5rem;
  background: var(--glass-bg); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--border); border-radius: var(--vq-radius-lg);
}
.vu-challenge-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--accent-gradient); opacity: 0.6;
}
.vu-challenge-title {
  font-family: var(--vq-font-mono); font-size: 0.92rem; font-weight: 700;
  color: var(--text-primary); margin-bottom: 8px;
  display: flex; align-items: center; gap: 8px;
}
.vu-challenge-title i { font-size: 12px; color: var(--accent); }
.vu-challenge-desc { font-family: var(--vq-font-sans); font-size: 0.88rem; line-height: 1.65; color: var(--text-muted); margin: 0; }

/* ── Conceptos relacionados ── */
.vu-related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0.75rem; }
.vu-related-card {
  display: flex; align-items: center; gap: 12px; padding: 1rem 1.15rem;
  background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--vq-radius-sm);
  color: var(--text-secondary); text-decoration: none;
  font-family: var(--vq-font-sans); font-size: 0.85rem; font-weight: 500;
  transition: all 0.25s var(--vq-ease);
}
.vu-related-card:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.vu-related-card i { font-size: 14px; width: 16px; text-align: center; color: var(--accent); opacity: 0.8; }
.vu-related-card:hover i { opacity: 1; }

/* ── Preguntas frecuentes ── */
.vu-faq-list { display: flex; flex-direction: column; gap: 0.75rem; }
.vu-faq-item {
  background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--vq-radius);
  overflow: hidden; transition: border-color 0.25s, box-shadow 0.25s;
}
.vu-faq-item:hover { border-color: rgba(240,180,79,0.4); }
.vu-faq-item[open] { border-color: rgba(240,180,79,0.4); box-shadow: var(--shadow-primary); }
.vu-faq-q {
  display: flex; align-items: center; gap: 14px; padding: 1.1rem 1.4rem;
  cursor: pointer; list-style: none; user-select: none;
  font-family: var(--vq-font-sans); font-size: 0.98rem; font-weight: 600; line-height: 1.45;
  color: var(--text-primary); transition: color 0.2s;
}
.vu-faq-q::-webkit-details-marker { display: none; }
.vu-faq-q::before {
  content: ''; flex-shrink: 0; width: 28px; height: 28px; border-radius: 8px;
  background-color: rgba(240,180,79,0.08); border: 1px solid rgba(240,180,79,0.18);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%23F0B44F' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M6 2v8M2 6h8'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: center;
  transition: transform 0.3s, background-color 0.3s;
}
.vu-faq-item[open] > .vu-faq-q::before { transform: rotate(45deg); background-color: rgba(240,180,79,0.16); }
.vu-faq-a {
  padding: 0 1.4rem 1.25rem 4rem;
  font-family: var(--vq-font-sans); font-size: 0.92rem; line-height: 1.75; color: var(--text-secondary);
}
.vu-faq-a p { margin: 0; }

/* ── Anterior / siguiente ── */
.vu-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  margin-top: 4rem; padding-top: 2.5rem; border-top: 1px solid var(--border);
}
.vu-nav-btn {
  display: flex; flex-direction: column; gap: 4px; padding: 1.25rem 1.5rem;
  background: var(--glass-bg); border: 1px solid var(--border); border-radius: var(--vq-radius);
  text-decoration: none; transition: all 0.25s var(--vq-ease);
}
.vu-nav-btn:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: var(--shadow-primary); }
.vu-nav-btn.next { text-align: right; }
.vu-nav-dir {
  font-family: var(--vq-font-mono); font-size: 0.65rem; font-weight: 700; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent); display: flex; align-items: center; gap: 6px;
}
.vu-nav-btn.next .vu-nav-dir { justify-content: flex-end; }
.vu-nav-term { font-family: var(--vq-font-mono); font-size: 0.92rem; font-weight: 700; color: var(--text-primary); line-height: 1.3; }
@media (max-width: 640px) {
  .vu-nav, .vu-related-grid, .vu-challenges-grid { grid-template-columns: 1fr; }
  .vu-faq-a { padding-left: 1.4rem; }
}

/* ── Barra lateral: cajas como .vq-widget ── */
.vu-sidebar { position: sticky; top: 100px; }
.vu-sidebar-card {
  background: var(--glass-bg); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border); border-radius: var(--vq-radius);
  padding: 1.75rem; margin-bottom: 1.5rem; box-shadow: var(--shadow-secondary);
}
.vu-sidebar-title {
  font-family: var(--vq-font-mono); font-size: 1.05rem; font-weight: 700;
  color: var(--text-primary); margin-bottom: 1.1rem;
}
.vu-sidebar-title i { color: var(--accent); font-size: 0.9rem; }
.vu-sidebar-stat {
  display: flex; justify-content: space-between; align-items: baseline; gap: 1rem;
  padding: 0.7rem 0; border-bottom: 1px solid var(--border); font-size: 0.85rem;
}
.vu-sidebar-stat:last-child { border-bottom: 0; }
.vu-sidebar-stat-label {
  font-family: var(--vq-font-mono); font-size: 0.65rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted);
}
.vu-sidebar-stat-val { font-family: var(--vq-font-sans); font-size: 0.85rem; font-weight: 600; color: var(--text-primary); text-align: right; }

/* Índice de la página, con el activo en ámbar */
.vu-toc-link {
  display: block; font-family: var(--vq-font-sans); font-size: 0.88rem; line-height: 1.45;
  color: var(--text-secondary); text-decoration: none;
  padding: 0.4rem 0 0.4rem 12px; margin-left: -12px; border-left: 2px solid transparent;
  transition: all 0.2s;
}
.vu-toc-link:hover, .vu-toc-link.active { color: var(--accent); border-left-color: var(--accent); }
.vu-toc-link.active { font-weight: 600; }

/* ── Barra de lectura ── */
.vu-progress { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 9998; background: transparent; }
.vu-progress-bar { height: 100%; width: 0%; background: var(--accent-gradient); transition: width 60ms linear; }