/* Shimmer base */
.skeleton {
  background-color: #e2e2e2;
  background-image: linear-gradient(90deg, #e2e2e2 0px, #f5f5f5 40px, #e2e2e2 80px);
  background-size: 600px;
  background-repeat: no-repeat;
  animation: shimmer 1.3s infinite linear;
  border-radius: 6px;
}

@keyframes shimmer {
  0% {
    background-position: -100px;
  }
  100% {
    background-position: 600px;
  }
}

/* Main Container */
.content-skeleton-box {
  background: #fff;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.08);
  max-width: 600px;
  margin: auto;
}

/* Year Tabs */
.year-scroll-skeleton {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 8px;
  padding-bottom: 10px;
}

.skeleton-year-tab {
  width: 60px;
  height: 32px;
  flex-shrink: 0;
  border-radius: 8px;
}

/* Scrollbar placeholder */
.skeleton-scrollbar {
  width: 100%;
  height: 6px;
  margin-top: 6px;
  border-radius: 3px;
}

/* Subject Tabs */
.subject-tabs-skeleton {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 16px;
}

.skeleton-subject-tab {
  width: 80px;
  height: 32px;
}

.skeleton-subject-tab.short {
  width: 60px;
}

.skeleton-subject-tab.long {
  width: 140px;
}

/* Download Button */
.download-skeleton {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

.skeleton-download-btn {
  width: 160px;
  height: 40px;
  border-radius: 8px;
}