.study-subject-manager {
  --subject-manager-green: #0e6f52;
  --subject-manager-ink: #17372e;
  --subject-manager-muted: #667a74;
  display: grid;
  gap: 16px;
  margin: 16px 0 20px;
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid color-mix(in srgb, var(--subject-manager-green) 20%, #dfe8e4);
  border-radius: 22px;
  background:
    radial-gradient(circle at 100% 0, rgba(119, 207, 168, .14), transparent 34%),
    #fbfdfc;
  box-shadow: 0 16px 34px rgba(18, 73, 57, .08);
}

.study-subject-manager-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.study-subject-manager-head > div {
  display: grid;
  gap: 4px;
}

.study-subject-manager-head h3,
.study-subject-manager-head p {
  margin: 0;
}

.study-subject-manager-head h3 {
  color: var(--subject-manager-ink);
  font-size: clamp(20px, 2.6vw, 26px);
  letter-spacing: -.035em;
}

.study-subject-manager-head p {
  max-width: 640px;
  color: var(--subject-manager-muted);
  font-size: 13px;
  line-height: 1.55;
}

.study-subject-manager-head > button {
  min-width: 64px;
  min-height: 42px;
}

.study-subject-manager-error,
.study-subject-manager-busy {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin: 0;
  padding: 11px 13px;
  border: 1px solid #f0b8b2;
  border-radius: 13px;
  background: #fff3f1;
  color: #a33a31;
  font-size: 13px;
  line-height: 1.45;
}

.study-subject-manager-error > span {
  flex: 1 1 auto;
}

.study-subject-manager-error > button {
  flex: 0 0 auto;
  min-height: 36px;
  margin: -5px -6px -5px 4px;
}

.study-subject-manager-busy {
  border-color: #bcded1;
  background: #eff9f5;
  color: #286c56;
}

.study-subject-manager-error .icon,
.study-subject-manager-busy .icon {
  flex: 0 0 auto;
  width: 17px;
  height: 17px;
  margin-top: 1px;
}

.study-subject-manager-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.study-subject-manager-item {
  display: grid;
  align-content: start;
  gap: 13px;
  min-width: 0;
  padding: 15px;
  border: 1px solid #dce7e2;
  border-radius: 17px;
  background: rgba(255, 255, 255, .96);
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.study-subject-manager-item:hover,
.study-subject-manager-item:focus-within {
  border-color: rgba(14, 111, 82, .34);
  box-shadow: 0 10px 24px rgba(18, 73, 57, .08);
}

.study-subject-manager-item.is-editing {
  grid-column: 1 / -1;
  border-color: rgba(14, 111, 82, .48);
}

.study-subject-manager-summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.study-subject-manager-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 13px;
  background: #e9f7f1;
  color: var(--subject-manager-green);
}

.study-subject-manager-mark .icon {
  width: 20px;
  height: 20px;
}

.study-subject-manager-copy {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.study-subject-manager-copy > span {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
}

.study-subject-manager-copy strong {
  overflow: hidden;
  color: var(--subject-manager-ink);
  font-size: 15px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.study-subject-manager-copy em {
  flex: 0 0 auto;
  padding: 3px 7px;
  border-radius: 999px;
  background: #edf3f0;
  color: #557069;
  font-size: 10px;
  font-style: normal;
  font-weight: 750;
}

.study-subject-manager-copy small {
  overflow: hidden;
  color: var(--subject-manager-muted);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.study-subject-manager-counts {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 5px;
}

.study-subject-manager-counts span {
  padding: 5px 7px;
  border-radius: 9px;
  background: #f4f7f6;
  color: #647770;
  font-size: 10px;
  white-space: nowrap;
}

.study-subject-manager-counts strong {
  color: var(--subject-manager-ink);
  font-size: 11px;
}

.study-subject-manager-actions,
.study-subject-manager-form-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 7px;
}

.study-subject-manager-actions button,
.study-subject-manager-form-actions button {
  min-height: 40px;
  border-radius: 11px;
}

.study-subject-manager-actions button:disabled {
  cursor: not-allowed;
  filter: grayscale(.35);
  opacity: .47;
}

.study-subject-delete-reason {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid #edf1ef;
  color: #789089;
  font-size: 11px;
  line-height: 1.45;
}

.study-subject-delete-reason.is-blocked {
  color: #86635e;
}

.study-subject-delete-reason.is-ready {
  color: #3d7d67;
}

.study-subject-manager-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding-top: 2px;
}

.study-subject-manager-form > label:not(.study-subject-manager-toggle) {
  display: grid;
  gap: 6px;
  color: var(--subject-manager-muted);
  font-size: 12px;
  font-weight: 700;
}

.study-subject-manager-form .input {
  width: 100%;
  min-width: 0;
  min-height: 44px;
}

.study-subject-manager-toggle {
  display: flex;
  grid-column: 1 / -1;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border: 1px solid #e1ebe7;
  border-radius: 13px;
  background: #f7faf8;
  cursor: pointer;
}

.study-subject-manager-toggle > input {
  flex: 0 0 auto;
  width: 19px;
  height: 19px;
  margin: 1px 0 0;
  accent-color: var(--subject-manager-green);
}

.study-subject-manager-toggle > span {
  display: grid;
  gap: 3px;
}

.study-subject-manager-toggle strong {
  color: var(--subject-manager-ink);
  font-size: 13px;
}

.study-subject-manager-toggle small {
  color: var(--subject-manager-muted);
  font-size: 11px;
  line-height: 1.45;
}

.study-subject-manager-form-actions {
  grid-column: 1 / -1;
}

.study-subject-manager[aria-busy="true"] .study-subject-manager-head,
.study-subject-manager[aria-busy="true"] .study-subject-manager-item:not(.is-editing) {
  opacity: .72;
}

@media (max-width: 820px) {
  .study-subject-manager-list {
    grid-template-columns: minmax(0, 1fr);
  }

  .study-subject-manager-item.is-editing {
    grid-column: auto;
  }
}

@media (max-width: 560px) {
  .study-subject-manager {
    margin-inline: -2px;
    padding: 14px;
    border-radius: 18px;
  }

  .study-subject-manager-head {
    gap: 10px;
  }

  .study-subject-manager-summary {
    grid-template-columns: 40px minmax(0, 1fr);
  }

  .study-subject-manager-counts {
    grid-column: 1 / -1;
    justify-content: flex-start;
    padding-left: 51px;
  }

  .study-subject-manager-form {
    grid-template-columns: minmax(0, 1fr);
  }

  .study-subject-manager-actions > button,
  .study-subject-manager-form-actions > button {
    flex: 1 1 0;
    min-height: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .study-subject-manager-item {
    transition: none;
  }
}