.subtask-section {
  background: #f9f9f9;
  border-radius: 12px;
  padding: 16px;
  margin-top: 24px;
}
.st-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
.btn-add-sub {
  border: none; 
  background: var(--blue-light); 
  color: var(--blue); 
  border-radius: 12px; 
  padding: 4px 10px; 
  font-weight: 700; 
  font-size: 12px;
  cursor: pointer;
}
.progress-box {
  margin-bottom: 16px;
}
.pb-info {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-sub);
  margin-bottom: 6px;
  font-weight: 600;
}
.pb-track {
  height: 6px;
  background: #e0e0e0;
  border-radius: 3px;
  overflow: hidden;
}
.pb-fill {
  height: 100%;
  transition: width 0.3s;
}
.block-alert {
  background: #ffe6e6;
  color: var(--red);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  border: 1px solid #ffccc7;
}
.toggle-bar {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-sub);
  cursor: pointer;
  padding: 4px 0;
}
.sub-list {
  display: none;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}
.sub-list.open {
  display: flex;
}

/* Distinct Sub-task Style */
.sub-card {
  background: #fff;
  padding: 12px 16px;
  border-radius: 6px;
  display: flex;
  position: relative;
  cursor: pointer;
  border: 1px solid #eee;
  border-left: 4px solid #e0e0e0; /* Default indent */
  transition: all 0.2s;
  box-shadow: none; /* Flat look for sub-items */
}

.sub-card:hover {
  background: #fafafa;
  transform: translateX(2px);
}

/* Status variants */
.sub-card.status-doing {
  border-left-color: var(--blue);
  background: #f0f7ff;
  border-color: #d6e4ff;
}

.sub-card.status-done,
.sub-card.status-verified {
  border-left-color: var(--green);
  opacity: 0.85;
  background: #f6ffed;
  border-color: #b7eb8f;
}

.sub-card.status-blocked,
.sub-card.status-andon {
  border-left-color: var(--red);
  background: #fff1f0;
  border-color: #ffa39e;
}

.sub-card.status-pending {
  border-left-color: var(--orange);
  background: #fffbe6;
  border-color: #ffe58f;
}

.sub-card.status-review {
  border-left-color: #722ed1; /* Purple */
  background: #f9f0ff;
  border-color: #d3adf7;
}

.sub-card.status-discarded {
  border-left-color: #999;
  background: #f5f5f5;
  border-color: #d9d9d9;
  opacity: 0.6;
  text-decoration: line-through;
}

.sub-card.status-todo {
  border-left-color: #ccc;
}

.sub-title {
  font-size: 14px; 
  font-weight: 600; 
  margin-bottom: 6px;
}
.sub-meta {
  font-size: 11px; 
  color: var(--text-sub); 
  display: flex; 
  align-items: center; 
  gap: 6px;
}
.bdg {
  display: inline-block;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  margin-bottom: 4px;
  color: #fff;
}
.bdg-todo { background: #ccc; }
.bdg-doing { background: var(--blue); }
.bdg-done { background: var(--green); }
.bdg-block { background: var(--red); }
.bdg-pending { background: var(--orange); }
.bdg-review { background: #722ed1; }

.btn-sub-transfer {
  background: transparent;
  border: none;
  color: var(--blue);
  font-weight: bold;
  font-size: 14px;
  cursor: pointer;
  padding: 0 4px;
  opacity: 0.7;
}
.btn-sub-transfer:hover {
  opacity: 1;
  background: rgba(0,0,0,0.05);
  border-radius: 4px;
}