.unit-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
  color: rgb(240, 240, 240);
  text-align: left;
  line-height: 1.7;
  background: rgba(29, 31, 59, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 2rem 2rem;
  backdrop-filter: blur(6px);
}

#unit-title {
  font-size: 2.4rem;
  color: rgb(255, 212, 59);
  margin-bottom: 0.3rem;
  font-weight: 700;
}

#unit-description {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: rgb(204, 204, 204);
  text-align: left;
}

.block {
  margin-bottom: 1.8rem;
  text-align: left;
}

.block.subtitle1 h2 {
  font-size: 1.9rem;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
  color: rgb(57, 189, 125);
  font-weight: 600;
}

.block.subtitle2 h3 {
  font-size: 1.35rem;
  margin-top: 1.2rem;
  margin-bottom: 0.5rem;
  color: rgb(100, 160, 255);
  font-weight: 500;
}

.block.paragraph p {
  font-size: 1.15rem;
  margin-bottom: 1rem;
  line-height: 1.8rem;
  color: rgb(230, 230, 230);
}

.block.list ul {
  margin-left: 1.5rem;
  margin-top: 0.5rem;
  margin-bottom: 1.5rem;
}

.block.list ul li {
  margin-bottom: 0.4rem;
  font-size: 1.12rem;
}

.block.code pre {
  background: rgb(27, 27, 27);
  padding: 1rem 1.2rem;
  border-radius: 10px;
  overflow-x: auto;
  margin-top: 0.8rem;
  margin-bottom: 1.8rem;
  border: 1px solid rgb(51, 51, 51);
}

.block.code pre code {
  display: block;
  padding-left: 0;
  margin: 0;
}

.block.note {
  background: rgb(29, 31, 59);
  border-left: 5px solid rgb(255, 212, 59);
  padding: 1rem 1.2rem;
  border-radius: 6px;
  margin: 1.3rem 0;
  color: rgb(255, 255, 255);
}

.block.tip {
  background: rgb(29, 31, 59);
  border-left: 5px solid rgb(31, 163, 86);
  padding: 1rem 1.2rem;
  border-radius: 6px;
  margin: 1.3rem 0;
  color: rgb(255, 255, 255);
}

.block.image-block img {
  width: 100%;
  border-radius: 10px;
  margin: 1.3rem 0;
  border: 1px solid rgb(51, 51, 51);
}

.block.image-block .caption {
  font-size: 0.95rem;
  text-align: left;
  color: rgb(170, 170, 170);
  margin-top: -0.6rem;
}

hr {
  margin: 2rem 0;
  border: none;
  border-top: 1px solid rgb(85, 85, 85);
}

code[class*="language-"] {
  padding: 2px 4px;
  border-radius: 4px;
  background: rgb(45, 45, 45);
}

.back-btn {
  display: inline-block;
  background: rgb(29, 31, 29);
  color: rgb(210, 207, 25);
  border: 2px solid rgb(210, 207, 25);
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.1rem;
  font-weight: 900;
  transition: all 0.25s ease;
  margin-bottom: 1.5rem;
}

.back-btn:hover {
  background: rgb(210, 207, 25);
  color: rgb(13, 15, 13);
  border-color: rgb(210, 207, 25);
  transform: translateY(-2px);
}

.test-btn {
  display: inline-block;
  background: #1d1f1d;
  color: #39bd7d;
  border: 2px solid #39bd7d;
  padding: 0.4rem 0.9rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 600;
  margin-top: 0.8rem;
  transition: 0.25s ease;
}

.test-btn:hover {
  background: #39bd7d;
  color: #0d0f0d;
  transform: translateY(-2px);
}

.block.collapsible {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  margin: 1.5rem 0;
  overflow: hidden;
  background: rgba(29, 31, 59, 0.4);
}

.collapsible-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1rem;
  cursor: pointer;
  font-weight: 600;
  background: rgba(39, 41, 69, 0.6);
  transition: background 0.2s ease;
}

.collapsible-header:hover {
  background: rgba(39, 41, 69, 0.9);
}

.collapsible-header .arrow {
  transition: transform 0.2s ease;
  font-size: 1.2rem;
}

.collapsible-content {
  padding: 0.8rem 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.unit-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: rgba(255, 255, 255, 0.03);
  color: #e6e6e6;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 8px;
  overflow: hidden;
}

.unit-table thead {
  background: rgba(255, 255, 255, 0.08);
}

.unit-table th,
.unit-table td {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  text-align: left;
}

.unit-table tr:last-child td {
  border-bottom: none;
}

.unit-table tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

.table-title {
  font-size: 1.3rem;
  color: rgb(57, 189, 125);
  margin-bottom: 0.6rem;
  font-weight: 600;
}