/* Shared components */

/* Floating Zalo button */
.floating-zalo{
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 54px;
  height: 54px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.10);
  border: 1px solid rgba(255,255,255,0.18);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.25);
  z-index: 9999;
}
.floating-zalo img{
  width: 40px;
  height: 40px;
  display: block;
}
.floating-zalo:hover{
  transform: translateY(-50%) scale(1.04);
}

/* Slider */
.course-slider{
  position: relative;
}
.course-slider .slider-controls{
  display: flex;
  gap: 10px;
}
.course-slider .slider-btn{
  width: 42px;
  height: 42px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.08);
  color: inherit;
  cursor: pointer;
}
.course-slider .slider-btn:hover{
  background: rgba(255,255,255,0.12);
}
.course-slider .slider-viewport{
  overflow: hidden;
}
.course-slider .slider-track{
  display: flex;
  gap: 18px;
  will-change: transform;
  transition: transform 420ms ease;
}

.course-card{
  min-width: calc((100% - 36px) / 3);
}

.course-card-header{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.course-level{
  display: flex;
  align-items: center;
  gap: 10px;
}
.course-level-icon{
  width: 18px;
  height: 18px;
  opacity: 0.9;
}
.course-detail-link{
  font-weight: 600;
  font-size: 14px;
  opacity: 0.95;
}

.tag-row{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}
.tag{
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.16);
  background: rgba(255,255,255,0.06);
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
}

@media (max-width: 980px){
  .course-card{ min-width: calc((100% - 18px) / 2); }
}
@media (max-width: 640px){
  .floating-zalo{ right: 14px; width: 50px; height: 50px; border-radius: 14px; }
  .floating-zalo img{ width: 36px; height: 36px; }
  .course-card{ min-width: 100%; }
}