/* Keep mobile landscape text at its authored size; browser zoom remains available. */
html { -webkit-text-size-adjust:100%; text-size-adjust:100%; }
:root {
  --bg:#FFFFFF;
  --bgc:#F2AA84;
  --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:#F2AA84;
}

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;
}

/* Shared compact controls for conversation history and reflection. */
.btn.view-control {
  padding:7px 12px;
  border:3px solid #262626;
  border-radius:4px;
  background:#fff;
  color:#262626;
  font:16px Arial, sans-serif;
  white-space:nowrap;
}
.btn.view-control:hover { background:#F2AA84; color:#262626; }

.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:#F2AA84;
}

.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 #F2AA84;
  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-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;
}

/* ---------------------------------------------------------------- */
/* Funktionsweise-Modal der 2D-Ansicht                               */
/*                                                                   */
/* Breiter als die uebrigen Modale, weil hier Icon und Erklaerung    */
/* nebeneinander stehen, und mit eigener Hoehenbegrenzung: die Liste */
/* ist laenger als ein kleiner Bildschirm.                           */
/* ---------------------------------------------------------------- */

.mode-btn-help {
  min-width:auto;
  padding:10px 18px;
}

.modal-help {
  width:min(640px, 94vw);
  display:flex;
  flex-direction:column;
  max-height:min(84vh, 780px);
}

.modal-head {
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:10px;
}

.modal-x {
  border:none;
  background:transparent;
  padding:0;
  margin:0;
  width:20px;
  height:20px;
  flex:0 0 20px;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  justify-content:center;
}

.modal-x:hover,
.modal-x:focus,
.modal-x:active {
  background:transparent;
  outline:none;
  box-shadow:none;
}

.modal-x img {
  width:20px;
  height:20px;
  display:block;
}

.modal-help-body {
  overflow-y:auto;
  margin:6px 0 0 0;
  padding-right:4px;
}

.help-section {
  margin-bottom:16px;
}

.help-section:last-child {
  margin-bottom:0;
}

.help-section-title {
  font-weight:600;
  font-size:14px;
  margin-bottom:8px;
  padding-bottom:4px;
  border-bottom:1px solid #e0e0e0;
}

.help-row {
  --help-line:21px;
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:6px 0;
  font-size:14px;
  line-height:1.5;
}

.help-icon {
  flex:0 0 46px;
  height:var(--help-line);
  display:inline-flex;
  align-items:center;
  justify-content:flex-start;
  gap:6px;
}

.help-icon img,
.help-icon svg {
  width:18px;
  height:18px;
  display:block;
  flex:0 0 18px;
}

.help-icon svg {
  color:var(--text);
}

.help-text {
  flex:1 1 auto;
  min-width:0;
  color:#444;
}

.help-text strong {
  color:var(--text);
}

.help-note {
  font-size:13px;
  color:#666;
  line-height:1.4;
  margin:0 0 10px 0;
}

.help-states {
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(120px, 1fr));
  gap:12px 10px;
}

.help-state {
  margin:0;
  text-align:center;
}

.help-state img {
  width:56px;
  height:auto;
  display:block;
  margin:0 auto 4px auto;
}

.help-state figcaption {
  font-size:12px;
  color:#555;
  line-height:1.3;
}

.material-progress-row {
  margin-bottom:6px;
  padding:8px 10px;
  border:1px solid #ddd;
  border-radius:5px;
  background:#fff;
  line-height:1.4;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
}

.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;
}

.material-entry-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.material-cancel-pending {
  font-size: 12px;
  color: #8a8a8a;
  white-space: nowrap;
}

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

.material-entry-row {
  display: inline-flex;
  align-items: stretch;
  gap: 4px;
  margin: 4px;
  vertical-align: middle;
}

.material-entry-row .choose-material-entry-btn {
  margin: 0;
}

.material-view-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  background: #ffffff;
  color: #262626;
  border: 3px solid #262626;
  border-radius: 5px;
  cursor: pointer;
}

.material-view-btn:hover { background: #F2AA84; }
.material-view-btn img { width: 28px; height: 28px; display: block; }

.material-preview-overlay {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  background: rgba(16, 20, 24, .82);
}

.material-preview-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: #ffffff;
  border-bottom: 3px solid #262626;
}

.material-preview-title {
  font-weight: 700;
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.material-preview-body {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
}

.material-preview-body img {
  max-width: 100%;
  max-height: 100%;
  background: #ffffff;
  border: 3px solid #262626;
}

.material-preview-body iframe {
  width: 100%;
  height: 100%;
  background: #ffffff;
  border: 3px solid #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); }
}