/* ============================================================
   REFERENCES.CSS — Kobi Proje Danışmanlık
   ============================================================
   Referanslar sayfası özel stilleri: filtre çubuğu (pill
   butonlar, aktif vurgu, mobilde yatay kaydırma), logo galerisi
   grid düzeni (5-6 sütun masaüstü, 3-4 tablet, 2 mobil),
   logo kart stilleri (beyaz arka plan, kenarlık, eşit boyut,
   object-fit contain), grayscale → renkli hover efekti,
   filtre geçiş animasyonu, staggered fade-in giriş animasyonu.
   
   BEM isimlendirme kuralı tutarlı şekilde uygulanır.
   ============================================================ */

/* ============================================================
   1. REFERANS BİLGİ METNİ
   ============================================================ */
.references-info {
  text-align: center;
  padding: var(--space-2xl) 0 var(--space-xl);
}

.references-info__text {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 700px;
  margin: 0 auto;
}

.references-info__highlight {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--color-primary);
  font-size: var(--font-size-2xl);
  display: block;
  margin-bottom: var(--space-sm);
}

/* ============================================================
   2. FİLTRE ÇUBUĞU
   ============================================================ */
.logo-gallery__filters {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: 0 0 var(--space-2xl);
}

.logo-gallery__filter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1.4rem;
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1.5px solid var(--color-border);
  border-radius: 50px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    box-shadow var(--transition-base);
}

.logo-gallery__filter:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: rgba(26, 42, 94, 0.04);
}

.logo-gallery__filter--active {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: #ffffff;
  border-color: var(--color-primary);
  box-shadow: 0 4px 12px rgba(26, 42, 94, 0.25);
}

.logo-gallery__filter--active:hover {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: #ffffff;
  border-color: var(--color-primary-dark);
}

/* Mobilde yatay kaydırma */
@media (max-width: 575px) {
  .logo-gallery__filters {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: var(--space-xl);
    margin: 0 calc(-1 * var(--container-padding));
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
  }

  .logo-gallery__filters::-webkit-scrollbar {
    display: none;
  }
}

/* ============================================================
   3. LOGO GALERİSİ GRİD
   ============================================================ */
.logo-gallery__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

@media (min-width: 576px) {
  .logo-gallery__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 768px) {
  .logo-gallery__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 992px) {
  .logo-gallery__grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (min-width: 1200px) {
  .logo-gallery__grid {
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-xl);
  }
}

/* ============================================================
   4. LOGO KART STİLLERİ
   ============================================================ */
.logo-gallery__item {
  position: relative;
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base),
    opacity 300ms ease;
}

.logo-gallery__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26, 42, 94, 0.15);
}

.logo-gallery__item img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.logo-gallery__item-name {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  text-align: center;
  background: rgba(255, 255, 255, 0.9);
  opacity: 0;
  transform: translateY(100%);
  transition:
    opacity var(--transition-base),
    transform var(--transition-base);
}

.logo-gallery__item:hover .logo-gallery__item-name {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   5. FİLTRE GEÇİŞ ANİMASYONU
   ============================================================ */
.logo-gallery__item--hidden {
  display: none;
}

.logo-gallery__item--fade-out {
  opacity: 0;
  transform: scale(0.9);
  pointer-events: none;
}

.logo-gallery__item--fade-in {
  animation: logoFadeIn 400ms ease forwards;
}

@keyframes logoFadeIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(8px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* ============================================================
   6. STAGGERED FADE-IN GİRİŞ ANİMASYONU
   ============================================================ */
.logo-gallery__item--stagger {
  opacity: 0;
  animation: logoStaggerIn 500ms ease forwards;
}

.logo-gallery__item--stagger:nth-child(1) { animation-delay: 0ms; }
.logo-gallery__item--stagger:nth-child(2) { animation-delay: 40ms; }
.logo-gallery__item--stagger:nth-child(3) { animation-delay: 80ms; }
.logo-gallery__item--stagger:nth-child(4) { animation-delay: 120ms; }
.logo-gallery__item--stagger:nth-child(5) { animation-delay: 160ms; }
.logo-gallery__item--stagger:nth-child(6) { animation-delay: 200ms; }
.logo-gallery__item--stagger:nth-child(n+7) { animation-delay: 240ms; }

@keyframes logoStaggerIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   7. REFERANS SAYAÇ BÖLÜMÜ
   ============================================================ */
.references-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  padding: var(--space-xl) 0;
  flex-wrap: wrap;
}

.references-stats__item {
  text-align: center;
}

.references-stats__number {
  font-family: var(--font-heading);
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
}

.references-stats__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

/* ============================================================
   8. REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .logo-gallery__item,
  .logo-gallery__item img,
  .logo-gallery__item--fade-in,
  .logo-gallery__item--stagger {
    animation: none !important;
    transition: none !important;
  }
}