:root {
  --bg: #FFFFFF;
  --bgc: #FF7C80;
  --text: #262626;
  --border: #262626;
  --border_w: 3px;
  --radius: 5px;
  --danger: #F44336;
}

* {
  box-sizing: border-box;
}

body {
  background-color: #f4f4f4;
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text);
}

h1 {
  text-align: center;
  margin: 0 0 18px 0;
}

h2 {
  margin: 0 0 10px 0;
}

hr {
  border: none;
  border-top: var(--border_w) solid var(--border);
  margin: 18px 0;
}

.hint {
  font-style: italic;
  color: #666;
  margin-top: 6px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  max-width: 1000px;
  width: min(1000px, calc(100% - 24px));
  margin: 20px auto;
  background: #F1F1F1;
  padding: 20px;
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.section {
  margin-bottom: 18px;
  border-radius: var(--radius);
  padding: 10px;
}

.instruction-container {
  padding: 10px;
  border-radius: var(--radius);
}

.logo-container {
  text-align: center;
  margin-top: 10px;
}

.logo {
  width: 150px;
  height: auto;
}

textarea {
  width: 100%;
  max-width: 100%;
  min-height: 50px;
  margin: 10px auto;
  background-color: var(--bg);
  padding: 14px;
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
  font-family: Arial, sans-serif;
  font-size: 15px;
  resize: vertical;
  display: block;
}

textarea:focus,
textarea:focus-visible {
  outline: none;
  border-color: var(--text);
  box-shadow: #FF7C80;
}

select {
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: #fff;
  color: var(--text);
  font-size: 14px;
  line-height: 1.2;
}

select:focus {
  outline: none;
  border-color: var(--text);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, .08);
}

input[type="file"] {
  display: none;
}

.answer-content {
  width: 100%;
  max-width: 100%;
  background-color: var(--bg);
  padding: 14px;
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
}

.btn,
button,
.custom-file-upload {
  background: var(--bg);
  color: var(--text);
  border: var(--border_w) solid var(--border);
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 15px;
  cursor: pointer;
  transition: background .12s ease, color .12s ease, transform .05s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  justify-content: center;
}

.btn:hover,
button:hover,
.custom-file-upload:hover {
  background: var(--text);
  color: #FFFFFF;
}

.btn:active,
button:active,
.custom-file-upload:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.custom-file-upload.is-disabled,
.icon-btn.is-disabled {
  opacity: .55;
  cursor: not-allowed;
  pointer-events: none;
}

.button-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.icon-btn {
  background: var(--bg);
  color: var(--text);
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
  width: 43px;
  min-width: 43px;
  height: 43px;
  padding: 0;
  font-size: 15px;
  cursor: pointer;
  transition: background .12s ease, color .12s ease, transform .05s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  line-height: 1;
  flex: 0 0 46px;
}

.icon-btn:hover {
  background: var(--text);
  color: #FFFFFF;
}

.icon-btn:active {
  transform: translateY(1px);
}

.icon-btn:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.btn-icon,
.icon-btn img {
  width: 24px;
  height: 24px;
  display: block;
  flex-shrink: 0;
  pointer-events: none;
}

.icon-btn:hover .btn-icon,
.custom-file-upload.icon-btn:hover .btn-icon,
.icon-btn:hover img {
  filter: invert(1);
}

.icon-btn.is-active {
  background: var(--text);
  color: #FFFFFF;
}

.icon-btn.is-active .btn-icon,
.icon-btn.is-active img {
  filter: invert(1);
}

.btn.btn-danger,
button.btn-danger {
  background: #FFFFFF;
  color: var(--danger);
  border-color: var(--danger);
}

.btn.btn-danger:hover,
button.btn-danger:hover {
  background: var(--danger);
  color: #FFFFFF;
}

button.btn-danger:disabled {
  opacity: .55;
  cursor: not-allowed;
}

.send-shared-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 10px;
}

#send-shared-btn {
  min-width: 220px;
  margin: 0;
}

#send-shared-btn.broadcast-mode:hover {
  background: var(--text);
  color: #FFFFFF;
  font-weight: 600;
}

#send-shared-btn.single-target-mode:hover {
  color: #262626;
  font-weight: 600;
}

#shared-status {
  margin-top: 10px;
}

.send-instruction-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  margin: 10px auto;
}

#send-instruction-btn {
  margin: 0 auto;
  display: inline-flex;
}

.send-feedback-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 10px auto;
}

#send-feedback-btn {
  margin: 0 auto;
  display: inline-flex;
}

.mode-toggle {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.mode-btn {
  min-width: 140px;
  padding: 10px 16px;
  border: 3px solid #262626;
  border-radius: 5px;
  background: #fff;
  color: #262626;
  font-weight: 600;
  cursor: pointer;
}

.mode-btn.active {
  background: #262626;
  color: #fff;
}

.unified-toolbar {
  margin-bottom: 10px;
}

.conversation-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  margin-bottom: 14px;
}

.conversation-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: #262626;
}

.conversation-id {
  font-size: 14px;
  font-weight: 600;
  color: #FF7C80;
}

.target-learner-btn {
  --target-color: #262626;
  color: #262626;
}

.target-learner-icon {
  width: 28px;
  height: 28px;
  display: block;
  flex-shrink: 0;
}

.target-learner-btn.active-target {
  border-color: var(--target-color);
  background: #fff;
  color: var(--target-color);
}

.target-learner-btn:hover:not(.active-target) {
  background: var(--text);
  color: #fff;
}

.target-learner-btn.active-target:hover {
  background: #fff;
  color: var(--target-color);
  border-color: var(--target-color);
}

.audio-controls {
  margin: 10px auto;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: nowrap;
  white-space: nowrap;
}

#answer-audio-controls {
  transform: translateX(22px);
}

.audio-main {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  width: auto;
}

.audio-volume {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding-left: 0;
  flex: 0 0 auto;
  width: auto;
}

.audio-vol-buttons {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.audio-vol-label {
  min-width: 52px;
  display: inline-block;
  font-weight: 600;
  text-align: center;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

#answer-audio {
  margin: 10px auto;
  display: block;
}

.learners-scroll {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 16px 0 12px;
}

.learners {
  display: flex;
  flex-wrap: nowrap;
  justify-content: flex-start;
  gap: 2px;
  align-items: flex-end;
  width: max-content;
  margin: 0 auto;
}

.learner-slot {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 28px;
  overflow: visible;
}

.learner-icon {
  width: 125px;
  height: 175px;
  object-fit: contain;
  object-position: center;
  border: var(--border_w) solid transparent;
  background-color: transparent;
  transition: transform .2s, border-color .2s;
  flex: 0 0 auto;
}

.learner-icon:not(.pulsing):hover {
  transform: scale(1.08);
}

.learner-icon.pulsing {
  animation: learnerPulse 1s ease-in-out infinite;
  transform-origin: center;
}

.learner-icon.support-helper {
  border-color: var(--support-color);
  box-shadow: 0 0 0 4px var(--support-color);
  background-color: #fff;
}

.learner-icon.support-target {
  border-color: var(--support-color);
  box-shadow: inset 0 0 0 4px var(--support-color);
  background-color: #fff;
}

.learner-icon.support-helper.support-target {
  box-shadow:
    0 0 0 4px var(--support-color),
    inset 0 0 0 4px var(--support-color);
}

.learner-loader {
  display: none;
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  width: fit-content;
  font-weight: 600;
  font-family: Arial, sans-serif;
  font-size: 18px;
  line-height: 1;
  background: linear-gradient(90deg, var(--lc) 50%, #0000 0) right/200% 100%;
  animation: l21 1.4s infinite linear;
}

.learner-loader::before {
  content: attr(data-label);
  color: #262626;
  padding: 0 4px;
  background: inherit;
  background-image: linear-gradient(90deg, #fff 50%, var(--lc) 0);
  -webkit-background-clip: text;
  background-clip: text;
}

.learner-slot.loading .learner-loader {
  display: block;
}

.answer-container {
  text-align: center;
  margin: 20px auto;
}

.spinner {
  display: block;
  margin: 10px auto;
  border: 4px solid #FF7C80;
  border-top: 4px solid var(--text);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  animation: spin 1s linear infinite;
}

.upload-status {
  margin-top: 8px;
}

.upload-filename {
  font-size: 13px;
  color: #666;
  margin-top: 4px;
  word-break: break-word;
}

.url-source-box {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin: 10px auto 0 auto;
  flex-wrap: wrap;
}

.task-analysis {
  margin: 10px auto 0 auto;
  text-align: left;
  padding: 12px;
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  font-size: 14px;
  line-height: 1.35;
}

.discussion-container {
  margin-top: 14px;
}

.discussion-content {
  text-align: left;
}

.discussion-line {
  margin: 0 0 10px 0;
  padding: 8px 10px;
  border: 3px solid #262626;
  border-radius: 4px;
  background: #fff;
}

.discussion-speaker {
  font-weight: 600;
}

#toggle-discussion-btn.selected,
#toggle-support-btn.selected {
  background: #262626;
  border-color: #262626;
}

#toggle-discussion-btn.selected .btn-icon,
#toggle-support-btn.selected .btn-icon {
  filter: invert(1);
}

#toggle-vote-btn.selected {
  background: #262626;
  border-color: #262626;
}

#toggle-vote-btn.selected .btn-icon {
  filter: invert(1);
}

#clear-support-btn {
  display: none;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  z-index: 9999;
}

.modal-overlay[hidden] {
  display: none !important;
}

.modal {
  width: min(520px, 92vw);
  background: #FFFFFF;
  border: var(--border_w) solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, .25);
  padding: 16px 16px 14px 16px;
  text-align: left;
}

.modal:focus,
.modal:focus-visible,
.modal-overlay:focus,
.modal-overlay:focus-visible {
  outline: none;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .25);
}

.modal-title {
  font-weight: 600;
  font-size: 16px;
  margin: 0 0 8px 0;
}

.modal-text {
  font-size: 14px;
  color: #444;
  line-height: 1.35;
  margin: 0 0 14px 0;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
}

.material-progress-row {
  margin-bottom: 6px;
  padding: 8px 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  background: #fff;
  line-height: 1.4;
}

.material-progress-row:last-child {
  margin-bottom: 0;
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(280px, 1fr));
  gap: 18px;
  align-items: start;
  margin-top: 8px;
}

.material-card {
  display: flex;
  flex-direction: column;
}

.material-action-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
}

.material-url-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
}

.material-url-row input[type="url"] {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
}

.material-selected-file,
.material-list {
  margin-top: 8px;
}

.material-progress-block {
  margin-top: 18px;
}

.material-entry {
  margin-bottom: 8px;
  padding: 8px 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  background: #fff;
  line-height: 1.4;
}

.material-entry:last-child {
  margin-bottom: 0;
}

.material-entry-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}

.material-entry-prefix {
  white-space: nowrap;
  flex: 0 0 auto;
}

.material-entry-line {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  flex-wrap: nowrap;
  min-width: 0;
  flex: 1 1 auto;
}

.material-entry-label {
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.material-delete-icon {
  border: none;
  background: transparent;
  padding: 0;
  margin: 0;
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.material-delete-icon:hover,
.material-delete-icon:focus,
.material-delete-icon:active {
  background: transparent;
  outline: none;
  box-shadow: none;
}

.material-delete-icon img {
  width: 18px;
  height: 18px;
  display: block;
  transition: filter 0.2s ease, opacity 0.2s ease;
}

.material-delete-icon:hover img,
.material-delete-icon:focus img {
  filter: brightness(0) saturate(100%) invert(55%) sepia(88%) saturate(3314%) hue-rotate(337deg) brightness(100%) contrast(92%);
}

.material-delete-icon:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.material-delete-icon:disabled img {
  filter: none;
}

.active-material-inline {
  margin-top: 10px;
  text-align: center;
  font-size: 14px;
  line-height: 1.4;
  color: #262626;
}

.material-list {
  margin-top: 8px;
  min-height: 84px;
}

@media (max-width: 1200px) {
  .materials-grid {
    grid-template-columns: repeat(2, minmax(280px, 1fr));
  }
}

@media (max-width: 1100px) {
  .material-url-row {
    flex-wrap: wrap;
  }
}

@media (max-width: 760px) {
  .materials-grid {
    grid-template-columns: 1fr;
  }
}

@keyframes l21 {
  100% {
    background-position: left;
  }
}

@keyframes learnerPulse {
  0% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.08);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}