.playground-shell {
  display: flex;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  background: #f4f7fb;
}

.session-list {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
  border-left: 1px solid rgba(159, 178, 199, 0.16);
}

.session-list-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  padding: 4px 0 0 8px;
  overflow-y: auto;
  overflow-x: hidden;
}

.session-list-spin,
.session-list-spin .semi-spin-children {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
}

.session-empty {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  justify-content: center;
  padding: 18px 6px;
  color: #6f8299;
  text-align: center;
}

.session-empty p {
  margin: 0;
  font-size: 12px;
}

.session-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 2px 0;
  border-radius: 8px;
  min-width: 0;
  animation: rowFadeIn 220ms var(--ease-emphasized) both;
  transition:
    background var(--motion-fast) var(--ease-standard),
    box-shadow var(--motion-normal) var(--ease-standard);
}

.session-row:hover {
  background: rgba(255, 255, 255, 0.08);
}

.session-row-active {
  background: linear-gradient(135deg, rgba(217, 45, 58, 0.16), rgba(217, 45, 58, 0.04));
  box-shadow: inset 2px 0 0 rgba(217, 45, 58, 0.86);
}

.session-row-main {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 4px 7px 8px;
  color: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
  text-align: left;
}

.session-row-icon {
  display: grid;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  place-items: center;
  border-radius: 5px;
  color: #7f93ab;
  background: rgba(255, 255, 255, 0.05);
  transition:
    color var(--motion-fast) var(--ease-standard),
    background var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-standard);
}

.session-row:hover .session-row-icon {
  transform: scale(1.04);
}

.session-row-project .session-row-icon {
  color: #ffffff;
  background: linear-gradient(135deg, #d92d3a 0%, #7f1d2d 100%);
}

.session-row-project-session {
  margin-left: 14px;
}

.session-row-project-session .session-row-main {
  padding-left: 6px;
}

.session-row-project-session .session-row-icon {
  color: #87a0bb;
}

.session-project-group {
  min-width: 0;
}

.session-project-children {
  display: grid;
  gap: 1px;
  min-width: 0;
  padding-left: 4px;
}

.session-project-empty {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 6px;
  margin-left: 18px;
  padding: 8px 8px 8px 12px;
  color: #7f93ab;
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 12px;
  text-align: left;
}

.session-project-empty span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-row-body {
  flex: 1;
  min-width: 0;
  display: block;
}

.session-row-title {
  display: block;
  overflow: hidden;
  color: #a9b8ca;
  font-size: 12px;
  font-weight: 650;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.session-row-active .session-row-title {
  color: #d8e1ec;
}

.session-row .semi-button {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  margin-right: 2px;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.96);
  transition:
    opacity var(--motion-fast) var(--ease-standard),
    transform var(--motion-fast) var(--ease-standard),
    background var(--motion-fast) var(--ease-standard);
}

.session-row:hover .semi-button,
.session-row:focus-within .semi-button {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.playground-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  background: #f4f7fb;
}

.playground-main-column {
  position: relative;
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

