:root {
  --bg-base: #07090f;
  --bg-surface: #0d1220;
  --bg-elevated: #121929;
  --bg-hover: #182236;
  --border: rgba(255, 255, 255, 0.07);
  --border-accent: rgba(0, 210, 255, 0.45);
  --accent: #00d2ff;
  --accent-dim: rgba(0, 210, 255, 0.12);
  --accent-glow: rgba(0, 210, 255, 0.25);
  --green: #00e87a;
  --green-dim: rgba(0, 232, 122, 0.12);
  --red: #ff4560;
  --orange: #ffab00;
  --text-primary: #dde8f5;
  --text-secondary: #7a90ab;
  --text-muted: #3d5060;
  --radius-sm: 2px;
  --radius: 3px;
  --radius-lg: 4px;
  --shadow: 0 6px 30px rgba(0, 0, 0, 0.6);
  --shadow-accent: 0 0 24px rgba(0, 210, 255, 0.18);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-base);
  background-image:
    linear-gradient(rgba(0, 210, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 210, 255, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  min-height: 100vh;
  color: var(--text-primary);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* ── Header ── */
.header {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.header::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border-top: 1px solid var(--border-accent);
  pointer-events: none;
}

.header h1 {
  font-size: 1.75em;
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.02em;
  text-shadow: 0 0 20px var(--accent-glow);
}

.room-code {
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid var(--border-accent);
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 1.4em;
  font-weight: 700;
  letter-spacing: 4px;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 12px var(--accent-glow);
}

/* ── Connection status ── */
.connection-status {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  flex-shrink: 0;
}

.connection-status.connected {
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

.connection-status.disconnected {
  background: var(--red);
  box-shadow: 0 0 8px var(--red);
}

.connection-status.connecting {
  background: var(--orange);
  box-shadow: 0 0 8px var(--orange);
  animation: pulse 1.4s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.3;
  }
}

/* ── Layout ── */
.main-content {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
}

/* ── Skyline section ── */
.skyline-section {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.skyline-section h2 {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 0.85em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

#skyline-canvas {
  width: 100%;
  height: 500px;
  background: linear-gradient(180deg, #020818 0%, #05102a 50%, #0a1a35 100%);
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid var(--border);
}

/* ── Sidebar ── */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.students-panel,
.controls-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.students-panel h3,
.controls-panel h3 {
  margin-bottom: 14px;
  color: var(--text-secondary);
  font-size: 0.78em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 10px;
}

.student-list {
  max-height: 400px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-hover) transparent;
}

.student-list::-webkit-scrollbar {
  width: 4px;
}

.student-list::-webkit-scrollbar-track {
  background: transparent;
}

.student-list::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 2px;
}

.student-item {
  padding: 6px 10px;
  margin-bottom: 3px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  border: 1px solid transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.student-item:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.student-item.selected {
  border-color: var(--border-accent);
  background: var(--accent-dim);
}

.student-color {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex-shrink: 0;
}

.student-info {
  flex: 1;
}

.student-name {
  font-weight: 600;
  font-size: 0.88em;
  color: var(--text-primary);
}

.student-level {
  margin-left: auto;
  font-size: 0.75em;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ── Bulk controls ── */
.bulk-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  margin-bottom: 6px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.select-all-label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.78em;
  color: var(--text-secondary);
  user-select: none;
}

.select-all-checkbox, .student-checkbox {
  width: 14px;
  height: 15px;
  cursor: pointer;
  flex-shrink: 0;
  /* hide native */
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-base);
  border: 1px solid var(--border);
  border-radius: 2px;
  position: relative;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  vertical-align: middle;
}

.select-all-checkbox:hover, .student-checkbox:hover {
  border-color: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
}

.select-all-checkbox:checked, .student-checkbox:checked {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.select-all-checkbox:indeterminate, .student-checkbox:indeterminate {
  background: var(--bg-elevated);
  border-color: var(--accent);
  box-shadow: 0 0 6px var(--accent-glow);
}

.select-all-checkbox:checked::after, .student-checkbox:checked::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 1px;
  width: 4px;
  height: 7px;
  border: 2px solid #070d1a;
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.select-all-checkbox:indeterminate::after, .student-checkbox:indeterminate::after {
  content: '';
  position: absolute;
  left: 2px;
  top: 5px;
  width: 7px;
  height: 0;
  border-top: 2px solid var(--accent);
}

.btn-bulk-complete {
  margin-left: auto;
  background: var(--green);
  color: #030d0a;
  border: none;
  padding: 4px 11px;
  border-radius: var(--radius-sm);
  font-size: 0.73em;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: box-shadow 0.2s, opacity 0.2s;
  white-space: nowrap;
}

.btn-bulk-complete:hover:not(:disabled) {
  box-shadow: 0 0 12px rgba(0, 232, 122, 0.3);
}

.btn-bulk-complete:disabled {
  background: var(--bg-hover);
  color: var(--text-muted);
  cursor: not-allowed;
}

/* ── Buttons ── */
.btn {
  background: var(--accent);
  color: #070d1a;
  border: none;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.95em;
  cursor: pointer;
  transition: box-shadow 0.2s, opacity 0.2s, transform 0.1s;
  width: 100%;
  margin-top: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.82em;
}

.btn:hover:not(:disabled) {
  box-shadow: 0 0 18px var(--accent-glow), 0 2px 8px rgba(0, 0, 0, 0.4);
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
}

.btn:disabled {
  background: var(--bg-hover);
  color: var(--text-muted);
  cursor: not-allowed;
  box-shadow: none;
}

.btn.btn-secondary {
  background: var(--green);
  color: #030d0a;
}

.btn.btn-secondary:hover:not(:disabled) {
  box-shadow: 0 0 18px rgba(0, 232, 122, 0.3), 0 2px 8px rgba(0, 0, 0, 0.4);
}

.btn.btn-danger {
  background: #c0392b;
  color: #fff;
  margin-top: 8px;
}

.btn.btn-danger:hover:not(:disabled) {
  background: #e74c3c;
  box-shadow: 0 0 18px rgba(231, 76, 60, 0.4), 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* ── Inventory ── */
.inventory-display {
  margin-top: 14px;
  padding: 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.inventory-title {
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-secondary);
  font-size: 0.78em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.inventory-items {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.inventory-item {
  background: var(--bg-hover);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 1.4em;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  min-width: 2.4em;
  min-height: 2.4em;
  line-height: 1;
}

.inventory-item:hover {
  transform: scale(1.15);
  border-color: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
}

.inventory-item .item-icon-img {
  width: 1.6em;
  height: 1.6em;
  object-fit: contain;
  border-radius: 2px;
}

/* ── Form / Login ── */
.form-container {
  max-width: 500px;
  margin: 80px auto;
  background: var(--bg-surface);
  padding: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow), var(--shadow-accent);
  position: relative;
}

.form-container::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border-top: 1px solid var(--border-accent);
  pointer-events: none;
}

.form-container h1 {
  text-align: center;
  color: var(--accent);
  margin-bottom: 28px;
  text-shadow: 0 0 20px var(--accent-glow);
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 7px;
  font-weight: 600;
  font-size: 0.8em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 1em;
  color: var(--text-primary);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.error-message {
  background: rgba(255, 69, 96, 0.12);
  color: var(--red);
  border: 1px solid rgba(255, 69, 96, 0.3);
  padding: 11px;
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  text-align: center;
  font-size: 0.9em;
}

/* ── Level info ── */
.level-info {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
}

.level-title {
  font-size: 1.35em;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.level-description {
  color: var(--text-secondary);
  margin-bottom: 14px;
  font-size: 0.95em;
  line-height: 1.6;
}

/* ── Progress indicator ── */
.progress-indicator {
  display: flex;
  justify-content: space-between;
  margin-bottom: 16px;
}

.progress-text {
  font-size: 0.8em;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.peers-badge {
  font-size: 0.75em;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius);
  padding: 3px 10px;
  vertical-align: middle;
  margin-left: 8px;
}

.progress-bar {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  transition: width 0.5s ease;
}

/* ── Static hint ── */
.static-hint {
  text-align: center;
  color: var(--text-secondary);
  padding: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9em;
}

/* ── How it works block (index page) ── */
.how-it-works {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px;
  font-size: 0.9em;
}

.how-it-works h3 {
  color: var(--accent);
  margin-bottom: 12px;
  font-size: 0.82em;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.how-it-works ul {
  list-style: none;
  color: var(--text-secondary);
  line-height: 2;
}

.how-it-works ul li::before {
  content: '›';
  color: var(--accent);
  font-weight: 700;
  margin-right: 8px;
}

/* ── Tagline ── */
.tagline {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 36px;
  font-size: 1.05em;
  line-height: 1.6;
}

/* ── Multiple choice / open input ── */
.choice-option {
  display: block;
  width: 100%;
  padding: 12px 16px;
  margin-bottom: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
  font-size: 0.95em;
}

.choice-option:hover {
  border-color: var(--border-accent);
  background: var(--accent-dim);
}

.choice-option.selected {
  border-color: var(--accent);
  background: var(--accent-dim);
  color: var(--accent);
}

/* ── Selected student info ── */
.selected-student-meta {
  font-size: 0.82em;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ── Level interaction panels ── */
.level-interaction-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

/* Multiple choice */
.mc-question {
  font-size: 1.05em;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.mc-choices {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mc-choice {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  font-size: 0.95em;
  color: var(--text-primary);
}

.mc-choice:hover {
  border-color: var(--border-accent);
  background: var(--accent-dim);
}

.mc-choice input[type="radio"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* Open input */
.open-input-prompt {
  font-size: 0.95em;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.open-input-field {
  width: 100%;
  min-height: 100px;
  padding: 11px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95em;
  color: var(--text-primary);
  resize: vertical;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  margin-bottom: 10px;
}

.open-input-field::placeholder {
  color: var(--text-muted);
}

.open-input-field:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

/* Click button */
.click-button-wrapper {
  display: flex;
  justify-content: center;
  padding: 20px 0;
  position: relative;
  min-height: 80px;
}

/* Feedback */
.answer-feedback {
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  margin-top: 10px;
  font-weight: 600;
  font-size: 0.9em;
  display: none;
}

.answer-feedback.error {
  background: rgba(255, 69, 96, 0.12);
  color: var(--red);
  border: 1px solid rgba(255, 69, 96, 0.3);
  display: block;
}

.answer-feedback.success {
  background: var(--green-dim);
  color: var(--green);
  border: 1px solid rgba(0, 232, 122, 0.3);
  display: block;
}

/* ── Building visualization ── */
.my-building {
  text-align: center;
  padding: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.building-visualization {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  height: 200px;
  margin: 20px 0;
}

.building-bar {
  width: 60px;
  background: linear-gradient(to top, var(--accent), rgba(0, 210, 255, 0.4));
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: height 0.5s ease;
  position: relative;
  box-shadow: 0 0 16px var(--accent-glow);
}

.building-height {
  position: absolute;
  top: -28px;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 700;
  color: var(--accent);
  font-size: 1.1em;
}

/* ── Rooms panel (teacher login) ── */
.rooms-section {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

.rooms-section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  color: var(--text-secondary);
  font-size: 0.78em;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.btn-link {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: 0.85em;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  transition: background 0.15s;
  font-weight: 600;
}

.btn-link:hover {
  background: var(--accent-dim);
}

.rooms-list {
  max-height: 280px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--bg-hover) transparent;
}

.rooms-list::-webkit-scrollbar {
  width: 4px;
}

.rooms-list::-webkit-scrollbar-track {
  background: transparent;
}

.rooms-list::-webkit-scrollbar-thumb {
  background: var(--bg-hover);
  border-radius: 2px;
}

.rooms-loading,
.rooms-empty {
  color: var(--text-muted);
  text-align: center;
  padding: 16px;
  font-size: 0.88em;
}

.room-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  margin-bottom: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  gap: 10px;
}

.room-item.room-item-last {
  border-color: var(--border-accent);
  background: var(--accent-dim);
}

.room-item-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.room-item-code {
  font-size: 1.05em;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.room-item-last .room-item-code {
  color: var(--accent);
  text-shadow: 0 0 10px var(--accent-glow);
}

.room-item-badge {
  display: inline-block;
  font-size: 0.66em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--border-accent);
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  margin-left: 6px;
  vertical-align: middle;
}

.room-item-meta {
  font-size: 0.78em;
  color: var(--text-secondary);
}

.room-item-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.btn-action {
  border: none;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.75em;
  font-weight: 700;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: opacity 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn-join {
  background: var(--accent);
  color: #070d1a;
}

.btn-join:hover {
  box-shadow: 0 0 12px var(--accent-glow);
}

.btn-delete {
  background: rgba(255, 69, 96, 0.12);
  color: var(--red);
  border: 1px solid rgba(255, 69, 96, 0.25);
}

.btn-delete:hover {
  background: rgba(255, 69, 96, 0.24);
}

/* ── Leave Room button (dashboard header) ── */
.btn-leave {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.75em;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

.btn-leave:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-accent);
}

/* ── Reward Notification ── */
.reward-notification {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-elevated);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  padding: 32px 40px;
  box-shadow: var(--shadow), var(--shadow-accent);
  z-index: 1000;
  text-align: center;
  min-width: 320px;
  animation: reward-pop 0.25s ease;
}

.reward-notification::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border-top: 1px solid var(--border-accent);
  pointer-events: none;
}

@keyframes reward-pop {
  from {
    opacity: 0;
    transform: translate(-50%, -52%) scale(0.95);
  }

  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

.reward-notification h2 {
  color: var(--accent);
  font-size: 1.4em;
  margin-bottom: 14px;
  text-shadow: 0 0 16px var(--accent-glow);
}

.reward-notification p {
  font-size: 1.05em;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.reward-notification .reward-items {
  font-weight: 700;
  color: var(--green);
  font-size: 1.1em;
  text-shadow: 0 0 12px rgba(0, 232, 122, 0.35);
}

.reward-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 4px;
}

.reward-chip {
  background: var(--bg-hover);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 1em;
  color: var(--green);
  font-weight: 600;
  text-shadow: 0 0 10px rgba(0, 232, 122, 0.3);
}

/* ── Item Modal ── */
.item-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: item-modal-fade 0.18s ease;
}

@keyframes item-modal-fade {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.item-modal-box {
  position: relative;
  width: min(75vh, 75vw);
  height: min(75vh, 75vw);
  background: var(--bg-elevated);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow), var(--shadow-accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  animation: item-modal-pop 0.2s ease;
}

@keyframes item-modal-pop {
  from {
    transform: scale(0.88);
    opacity: 0;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

.item-modal-close {
  position: absolute;
  top: 12px;
  right: 14px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.6em;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: color 0.15s ease, background 0.15s ease;
}

.item-modal-close:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.item-modal-emoji {
  font-size: clamp(5rem, 22vmin, 14rem);
  line-height: 1;
  user-select: none;
}

.item-modal-image {
  width: 60%;
  height: 60%;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.item-modal-name {
  font-size: clamp(0.9rem, 2.5vmin, 1.4rem);
  font-weight: 600;
  color: var(--text-secondary);
  text-align: center;
  padding: 0 16px;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }

  .sidebar {
    flex-direction: row;
  }

  .students-panel,
  .controls-panel {
    flex: 1;
  }
}