/* ================================================
   SCROLL ANIMATIONS
   ================================================ */

/* --- Базовое состояние до появления --- */
.animate-item {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.55s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

/* --- Состояние после появления --- */
.animate-item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Stagger: каждый следующий элемент чуть позже --- */
.animate-item:nth-child(1) { transition-delay: 0ms; }
.animate-item:nth-child(2) { transition-delay: 100ms; }
.animate-item:nth-child(3) { transition-delay: 200ms; }
.animate-item:nth-child(4) { transition-delay: 300ms; }
.animate-item:nth-child(5) { transition-delay: 120ms; }
.animate-item:nth-child(6) { transition-delay: 240ms; }

/* Уважаем prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .animate-item {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ================================================
   SKELETON LOADER — портфолио карточки
   ================================================ */

.skeleton-card .taste-portfolio-img {
  display: block;
}

/* Пока картинка не загрузилась — показываем shimmer */
.skeleton-card .image-container::before {
  content: '';
  display: block;
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    #e8e8e8 25%,
    #f5f5f5 50%,
    #e8e8e8 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s infinite;
  z-index: 1;
  border-radius: 0;
  transition: opacity 0.3s ease;
}

/* Убираем shimmer когда картинка загрузилась */
.skeleton-card.loaded .image-container::before {
  opacity: 0;
  pointer-events: none;
}

@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Skeleton для текстового блока (до загрузки) */
.skeleton-card .applications::before {
  content: '';
  display: block;
  height: 16px;
  width: 60%;
  background: linear-gradient(90deg, #e8e8e8 25%, #f0f0f0 50%, #e8e8e8 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.4s infinite;
  border-radius: 4px;
  margin-bottom: 10px;
  transition: opacity 0.3s ease;
}

.skeleton-card.loaded .applications::before {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .skeleton-card .image-container::before,
  .skeleton-card .applications::before {
    animation: none;
  }
}

/* ================================================
   SCROLL TO TOP BUTTON
   ================================================ */

.scroll-top-btn {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 99;

  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  padding: 0;
  cursor: pointer;

  background-color: #4d5ae5;
  color: #ffffff;

  display: flex;
  align-items: center;
  justify-content: center;

  opacity: 0;
  transform: translateY(16px) scale(0.85);
  pointer-events: none;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease,
    background-color 0.25s ease;

  box-shadow: 0 4px 16px rgba(77, 90, 229, 0.35);
}

/* hidden attr убирается через JS, потом плавно появляется */
.scroll-top-btn:not([hidden]) {
  pointer-events: auto;
}

.scroll-top-btn.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.scroll-top-btn:hover,
.scroll-top-btn:focus-visible {
  background-color: #404bbf;
  transform: translateY(-2px) scale(1.05);
}

.scroll-top-btn:active {
  transform: scale(0.95);
}

@media screen and (max-width: 767px) {
  .scroll-top-btn {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

.mobile-menu {
  z-index: 999;
}