:root {
  --tptext-color: #000000;
  --tpmain-color: #ffffff;
  --tpbutton-color: rgb(244, 244, 244);
  --tphover-color: rgb(228, 228, 228);
  --tpicon-color: 0;
}

.dark-mode {
  --tptext-color: white;
  --tpmain-color: #0f0f0f;
  --tpbutton-color: rgb(42, 42, 42);
  --tphover-color: rgb(60, 60, 60);
  --tpicon-color: 1;
}

.topic-bar-container {
  position: relative;
  font-family: Roboto, Arial;
  font-weight: 500;
  display: flex;
  height: 60px;
  align-items: center;
  position: fixed;
  right: 0;
  left: 240px;
  top: 55px;
  z-index: 1;
  background-color: var(--tpmain-color);
}

.topic-bar-container.closed {
  left: 80px;
}

.topic-bar-container::before {
  content: "";
  position: absolute;
  left: 40px;
  width: 40px;
  height: 70%;
  background: linear-gradient(to right, var(--tpmain-color), transparent);
  pointer-events: none;
}

.topic-bar-container::after {
  content: "";
  position: absolute;
  right: 40px;
  width:180px;
  height: 70%;
  background: linear-gradient(to left, var(--tpmain-color), transparent);
  pointer-events: none;
}

.topic-bar {
  display: flex;
  gap: 10px; /* the gaps between topics */
  padding: 15px 7px;
}

.topic {
  display: flex;
  align-items: center;
  font-size: 14px;
  padding: 7px 13px;
  border: none;
  border-radius: 9px;
  background-color: var(--tpbutton-color);
  color: var(--tptext-color);
  cursor: pointer;
  transition: transform 0.2s, background-color 0.2s;
}
.topic:hover {
  background-color: var(--tphover-color);
  color: var(--tptext-color);
  transform: scale(1.05);
  outline: none;
}

.scroll-button {
  background-color: var(--tpmain-color);
  border: none;
  font-size: 18px;
  padding: 5px 8px;
  border-radius: 50px;
  cursor: pointer;
  z-index: 1010;
}

.right-section-p {
  display: flex;
  position: fixed;
  width: 55px;
  align-items: center;
  background-color: var(--tpmain-color);
  z-index: 1009;
  right: 0px;
}

.scroll-button:hover {
  background-color: var(--tphover-color);
}

.scroll-button img {
  filter: invert(var(--tpicon-color));
  margin-top: 3px;
}

/* Responsive Design */
@media (max-width: 1200px) {
  .topic-bar-container {
    left: 150px;
  }
}
