/* ==========================================================
   CREDENTIALS / FORMACIÓN
   La estructura vive aquí; los temas sobrescriben tokens.
========================================================== */

.credentials {
  padding: var(--credentials-section-padding) 0;
}

/* ==========================================================
   VARIANTE CARDS
========================================================== */

.credentials-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--spacing-lg);
}

.credential-card {
  height: 100%;
  padding: var(--credential-card-padding);
  border: var(--credential-card-border);
  border-radius: var(--credential-card-radius);
  background: var(--credential-card-background);
  box-shadow: var(--credential-card-shadow);
  text-align: center;
  transition:
    transform var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    background-color var(--transition-base);
}

.credential-card:hover {
  transform: translateY(
    var(--credential-card-hover-translate-y)
  );
  border-color:
    var(--credential-card-hover-border-color);
  box-shadow:
    var(--credential-card-hover-shadow);
}

.credential-card h3 {
  margin-bottom: var(--spacing-md);
  font-size: var(--credential-title-size);
  font-weight: var(--credential-title-weight);
}

.credential-card p {
  color: var(--credential-description-color);
  font-size: var(--credential-description-size);
  line-height: var(--credential-description-line-height);
}

/* ==========================================================
   VARIANTE TIMELINE
========================================================== */

.credentials-timeline-list {
  max-width: 850px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}

.credential-timeline-item {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: var(--spacing-xl);
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.credential-timeline-item:first-child {
  border-top: 1px solid var(--color-border);
}

.credential-number {
  padding-top: var(--spacing-xs);
  color: var(--primary);
  font-size: 0.8rem;
  font-weight: var(--credential-timeline-number-weight);
  letter-spacing: 0.12em;
}

.credential-timeline-item h3 {
  margin-bottom: var(--spacing-sm);
  font-weight: var(--credential-title-weight);
}

.credential-timeline-item p {
  color: var(--credential-description-color);
  line-height: var(--credential-description-line-height);
}

/* ==========================================================
   VARIANTE COMPACT
========================================================== */

.credentials-compact .container {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  align-items: start;
  gap: var(--spacing-2xl);
}

.credentials-compact-header {
  position: sticky;
  top: 110px;
}

.credentials-compact-header .section-title {
  margin-top: var(--spacing-md);
}

.credentials-compact-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.credential-compact-item {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-border);
  transition:
    padding-left var(--transition-base),
    border-color var(--transition-base);
}

.credential-compact-item:first-child {
  border-top: 1px solid var(--color-border);
}

.credential-compact-item:hover {
  padding-left: var(--credential-compact-hover-indent);
}

.credential-compact-item h3 {
  margin-bottom: var(--spacing-sm);
  font-weight: var(--credential-title-weight);
}

.credential-compact-item p {
  color: var(--credential-description-color);
  font-size: 0.925rem;
  line-height: var(--credential-description-line-height);
}

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

@media (max-width: 900px) {
  .credentials-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--spacing-md);
  }

  .credentials-compact .container {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .credentials-compact-header {
    position: static;
  }

  .credential-card {
    padding: var(--spacing-lg);
  }

  .credential-timeline-item {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .credential-compact-item {
    padding: var(--spacing-md) var(--spacing-sm);
  }
}

@media (max-width: 550px) {
  .credentials-grid {
    grid-template-columns: 1fr;
  }

  .credential-timeline-item {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) 0;
  }

  .credential-number {
    padding-top: 0;
  }

  .credential-card {
    padding: var(--spacing-md);
  }

  .credential-compact-item {
    padding: var(--spacing-md) 0;
  }

  .credential-compact-item:hover {
    padding-left: var(--spacing-sm);
  }
}

@media (prefers-reduced-motion: reduce) {
  .credential-card,
  .credential-compact-item {
    transition: none;
  }

  .credential-card:hover {
    transform: none;
  }
}