/* Sustancia gris y presentación del proyecto: misma paleta del explorador. */
/* Las secciones siguen accesibles también en tablet y móvil. */
.main-nav { gap: 16px; }
.info-hero { max-width: 860px; padding: 24px 0 28px; }
.info-hero h1 { margin: 12px 0; }
.info-hero > p:last-child { color: var(--muted); font-size: 1.08rem; line-height: 1.7; }
.study-context { display: grid; grid-template-columns: 180px 1fr; gap: 24px; padding: 22px 26px; margin-bottom: 24px; border-left: 4px solid var(--teal); }
.study-context p { margin: 0; line-height: 1.7; color: var(--muted); }
.gray-images, .about-details { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.resource-heading, .resource-body { padding: 22px 24px; }
.resource-heading h2, .resource-card h3 { margin: 12px 0 8px; font-size: 1.35rem; }
.resource-kind { color: var(--teal); font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.resource-meta { margin: 0; color: var(--muted); font-size: .83rem; line-height: 1.6; }
.gray-image-card { overflow: hidden; }
.gray-image-link { display: flex; align-items: center; justify-content: center; height: 410px; padding: 16px; background: white; border-block: 1px solid var(--line); }
.gray-image-link img { display: block; max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; }
.resource-body > p, .resource-card > p, .about-page p { line-height: 1.75; }
.resource-actions { display: flex; gap: 20px; flex-wrap: wrap; margin: 20px 0; }
.resource-actions a, .resource-card > a, .about-page a, .resource-section-heading a { color: var(--teal); text-decoration-thickness: 1px; text-underline-offset: 4px; }
.resource-credit { color: var(--muted); font-size: .75rem; line-height: 1.7; }
.resource-credit a { color: inherit; }
.resource-section-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin: 38px 0 20px; }
.resource-section-heading h2 { margin: 10px 0 0; }
.gray-viewers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.resource-card { padding: 24px; }
.resource-card > p:not(.resource-credit):not(.resource-meta) { color: var(--muted); }
.about-intro { padding: 30px; max-width: 1000px; font-size: 1.08rem; }
.about-intro p:first-child { margin-top: 0; }
.about-principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; margin: 26px 0; }
.about-principle { padding: 26px; }
.about-principle h2 { font-size: 1.15rem; margin: 18px 0 10px; }
.about-principle p, .about-details p { color: var(--muted); }
.about-details > section { padding: 28px; }
.about-details h2 { margin: 16px 0; }
.about-credits { margin-top: 24px; padding: 28px; }
.about-credits h2 { margin: 16px 0 24px; }
.about-credit { display: grid; grid-template-columns: minmax(150px, 1fr) 2fr; gap: 18px; padding: 16px 0; border-top: 1px solid var(--line); }
.about-credits > p { color: var(--muted); font-size: .85rem; margin-bottom: 0; }
.about-people { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; margin-top: 24px; }
.about-person { padding: 24px; }
.about-contact { margin: 24px 0; }
@media (max-width: 1100px) {
  .topbar { height: auto; min-height: 100px; flex-wrap: wrap; padding-top: 15px; gap: 12px; }
  .main-nav { order: 3; width: 100%; height: 42px; justify-content: center; }
  .about-principles { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .main-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); height: auto; gap: 0 8px; }
  .nav-btn { min-height: 42px; padding: 8px 4px; }
  .info-hero { padding-top: 8px; }
  .study-context, .gray-images, .gray-viewers, .about-details, .about-people { grid-template-columns: 1fr; }
  .study-context { gap: 10px; padding: 20px; }
  .gray-image-link { height: 320px; }
  .resource-heading, .resource-body, .resource-card, .about-intro, .about-principle, .about-details > section, .about-credits { padding: 22px; }
  .resource-section-heading { align-items: flex-start; flex-direction: column; }
  .about-credit { grid-template-columns: 1fr; gap: 8px; }
}