:root {
  --bg-page: #f1f5f9;
  --bg-card: #ffffff;
  --text-main: #0f172a;
  --text-sub: #475569;
  --border-color: #e2e8f0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --teacher-accent: #7c3aed;
  --robot-a: #0284c7;
  --robot-b: #ea580c;
  --block-flow: #f59e0b;
  --block-wait: #8b5cf6;
  --block-move: #10b981;
  --block-turn: #06b6d4;
  --danger: #dc2626;
  --success: #16a34a;
}

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

body {
  font-family: 'Pretendard', 'Malgun Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
}

/* 상단 글로벌 네비게이션 바 */
.top-utility-bar {
  background: #0f172a;
  color: #fff;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.brand-group h1 {
  font-size: 1.05rem;
  font-weight: 700;
}

.brand-badge {
  background: #38bdf8;
  color: #0f172a;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 3px 8px;
  border-radius: 6px;
}

.privacy-pill {
  background: rgba(16, 185, 129, 0.2);
  border: 1px solid #34d399;
  color: #6ee7b7;
  font-size: 0.75rem;
  padding: 2px 9px;
  border-radius: 999px;
}

.view-switcher {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.switch-btn {
  background: #1e293b;
  color: #cbd5e1;
  border: 1px solid #334155;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.switch-btn:hover {
  background: #334155;
  color: #fff;
}

.switch-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: #60a5fa;
}

.switch-btn.highlight {
  border-color: #a78bfa;
  color: #ddd6fe;
}

.switch-btn.highlight.active {
  background: var(--teacher-accent);
  color: #fff;
}

.mini-badge {
  background: #334155;
  color: #fbbf24;
  padding: 1px 6px;
  border-radius: 99px;
  font-size: 0.72rem;
  margin-left: 4px;
}

/* 레이아웃 컨테이너 */
.app-container {
  max-width: 1560px;
  margin: 0 auto;
  padding: 16px;
}

.role-section {
  display: none;
}

.role-section.active {
  display: block;
}

/* 교사+학생 동시 시연 분할 뷰 */
.app-container.split-view-mode {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 100%;
}

.app-container.split-view-mode #studentSection,
.app-container.split-view-mode #teacherSection {
  display: block;
  border: 2px solid #cbd5e1;
  border-radius: 14px;
  padding: 10px;
  background: #e2e8f0;
  position: relative;
  overflow: hidden;
}

/* 공통 카드 및 버튼 */
.card {
  background: var(--bg-card);
  border-radius: 14px;
  border: 1px solid var(--border-color);
  padding: 18px;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-lg {
  padding: 11px 18px;
  font-size: 0.96rem;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.8rem;
}

.btn-xs {
  padding: 4px 9px;
  font-size: 0.76rem;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-teacher {
  background: var(--teacher-accent);
  color: #fff;
}

.btn-secondary {
  background: #e2e8f0;
  color: #1e293b;
}

.btn-outline {
  background: #fff;
  color: #334155;
  border: 1px solid #cbd5e1;
}

.btn-outline:hover {
  background: #f8fafc;
}

.btn-outline-light {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-accent {
  background: #eef2ff;
  color: #4338ca;
  border: 1px solid #c7d2fe;
}

.btn-warning {
  background: #fef3c7;
  color: #b45309;
  border: 1px solid #fde68a;
}

.btn-warning.active-hand {
  background: #f59e0b;
  color: #fff;
  animation: pulse 1.2s infinite;
}

.btn-hw {
  background: #f0fdf4;
  color: #15803d;
  border: 1px solid #bbf7d0;
}

/* 1. 랜딩 페이지 */
.landing-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 20px;
  margin-top: 8px;
}

.login-card {
  position: relative;
  padding-top: 28px;
}

.card-ribbon {
  display: inline-block;
  background: #dbeafe;
  color: #1e40af;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 99px;
  margin-bottom: 10px;
}

.teacher-ribbon {
  background: #ede9fe;
  color: #5b21b6;
}

.subtext {
  color: var(--text-sub);
  font-size: 0.9rem;
  margin-top: 4px;
  margin-bottom: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.code-input-row {
  display: flex;
  gap: 8px;
}

.code-input-row input,
.form-group input {
  padding: 9px 12px;
  border: 2px solid #cbd5e1;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  width: 100%;
}

#inputClassCode {
  max-width: 200px;
  text-transform: uppercase;
  letter-spacing: 2px;
  text-align: center;
  color: var(--primary);
}

.status-note {
  margin-top: 6px;
  font-size: 0.84rem;
  padding: 6px 10px;
  border-radius: 6px;
}

.status-note.success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.number-select-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 7px;
}

.num-btn {
  padding: 10px 4px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #f8fafc;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.12s;
}

.num-btn:hover {
  border-color: var(--primary);
  background: #eff6ff;
}

.num-btn.selected {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary-hover);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

.num-btn.online-dot::after {
  content: '•';
  color: #22c55e;
  margin-left: 2px;
}

.selected-number-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  margin-top: 10px;
}

.accent-text {
  color: var(--primary);
  font-size: 1.05rem;
}

.pin-hint {
  font-size: 0.78rem;
  color: #64748b;
  margin-left: 6px;
}

.feature-checklist {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 16px 0;
  background: #f8fafc;
  padding: 14px;
  border-radius: 10px;
}

.feature-item {
  font-size: 0.88rem;
}

.teacher-quick-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: #f5f3ff;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}

.code-badge {
  background: #5b21b6;
  color: #fff;
  padding: 3px 10px;
  border-radius: 6px;
  letter-spacing: 1px;
}

.btn-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* 2. 학생용 워크스페이스 */
.student-topbar {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
}

.student-id-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.class-chip {
  background: #e0f2fe;
  color: #0369a1;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 4px 10px;
  border-radius: 99px;
}

.student-num-chip {
  background: #dbeafe;
  color: #1e40af;
  font-weight: 800;
  font-size: 0.88rem;
  padding: 4px 12px;
  border-radius: 99px;
}

.compact-select {
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid #cbd5e1;
  font-size: 0.8rem;
}

.level-selector-bar {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.lvl-btn {
  padding: 6px 11px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #f8fafc;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

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

.lvl-btn.cleared::after {
  content: ' ⭐';
}

.lvl-btn.locked {
  opacity: 0.5;
  cursor: not-allowed;
  background: #e2e8f0;
}

.student-actions-group {
  display: flex;
  gap: 8px;
  align-items: center;
}

.hw-dot {
  background: #cbd5e1;
  color: #334155;
  padding: 1px 6px;
  border-radius: 99px;
  font-size: 0.72rem;
}

.hw-dot.connected {
  background: #16a34a;
  color: #fff;
}

.student-workspace {
  display: grid;
  grid-template-columns: 580px 1fr;
  gap: 14px;
}

.app-container.split-view-mode .student-workspace {
  grid-template-columns: 1fr;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 8px;
}

.level-pill {
  display: inline-block;
  background: #dbeafe;
  color: #1d4ed8;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 6px;
  margin-bottom: 3px;
}

.timer-box {
  background: #0f172a;
  color: #fff;
  padding: 6px 12px;
  border-radius: 10px;
  text-align: right;
  min-width: 96px;
}

.timer-label {
  display: block;
  font-size: 0.68rem;
  color: #94a3b8;
}

.timer-value {
  font-size: 1.15rem;
  font-weight: 800;
  color: #38bdf8;
  font-variant-numeric: tabular-nums;
}

.mission-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
  background: #f8fafc;
  padding: 8px 12px;
  border-radius: 8px;
  margin-bottom: 10px;
  border-left: 4px solid var(--primary);
}

.canvas-wrapper {
  position: relative;
  background: #ffffff;
  border: 2px solid #cbd5e1;
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

#cpmCanvas {
  max-width: 100%;
  height: auto;
  display: block;
}

.sim-overlay-banner {
  position: absolute;
  bottom: 12px;
  left: 12px;
  right: 12px;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.9rem;
  text-align: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.sim-overlay-banner.success {
  background: rgba(22, 163, 74, 0.95);
  color: #fff;
}

.sim-overlay-banner.error {
  background: rgba(220, 38, 38, 0.95);
  color: #fff;
}

.hidden {
  display: none !important;
}

.sim-controls-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  gap: 8px;
  flex-wrap: wrap;
}

.run-buttons {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.btn-run {
  background: #16a34a;
  color: #fff;
}

.btn-run:hover {
  background: #15803d;
}

.btn-hw-run {
  background: #0284c7;
  color: #fff;
}

.speed-control {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-sub);
}

.algo-feedback-box {
  margin-top: 10px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 10px 12px;
}

.feedback-title {
  font-size: 0.8rem;
  font-weight: 800;
  color: #334155;
  margin-bottom: 4px;
}

.feedback-body {
  font-size: 0.84rem;
  color: #1e293b;
}

/* 블록 코딩 패널 */
.coding-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.robot-tabs {
  display: flex;
  gap: 5px;
}

.robot-tab {
  padding: 6px 11px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #f1f5f9;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.robot-tab.active {
  background: #0f172a;
  color: #fff;
  border-color: #0f172a;
}

.preset-actions {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.block-palette {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}

.palette-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.palette-label {
  font-size: 0.76rem;
  font-weight: 800;
  color: #64748b;
  min-width: 95px;
}

.palette-block {
  border: none;
  color: #fff;
  padding: 6px 11px;
  border-radius: 7px;
  font-size: 0.8rem;
  cursor: pointer;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.18);
  transition: transform 0.1s;
}

.palette-block:active {
  transform: translateY(1px);
}

.block-flow {
  background: var(--block-flow);
}

.block-wait {
  background: var(--block-wait);
}

.block-move {
  background: var(--block-move);
}

.block-turn {
  background: var(--block-turn);
}

.target-robot-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 8px;
  padding: 6px 10px;
  background: #f1f5f9;
  border-radius: 8px;
}

.radio-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 99px;
  cursor: pointer;
  background: #fff;
  border: 1px solid #cbd5e1;
}

.robot-workspaces-container.split-mode {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.robot-workspaces-container.single-a #workspaceBoxB {
  display: none;
}

.robot-workspaces-container.single-b #workspaceBoxA {
  display: none;
}

.robot-workspace-box {
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  background: #f8fafc;
  min-height: 330px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
}

.robot-workspace-box.active-target {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.ws-box-header {
  padding: 8px 12px;
  font-size: 0.84rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: 8px 8px 0 0;
}

.robot-a-header {
  background: #e0f2fe;
  color: #0369a1;
}

.robot-b-header {
  background: #ffedd5;
  color: #c2410c;
}

.btn-clear-ws {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(0, 0, 0, 0.1);
  padding: 2px 7px;
  border-radius: 5px;
  font-size: 0.73rem;
  cursor: pointer;
}

.start-hat-block {
  margin: 10px 10px 4px 10px;
  background: #16a34a;
  color: #fff;
  font-weight: 800;
  font-size: 0.8rem;
  padding: 7px 12px;
  border-radius: 12px 12px 4px 4px;
}

.block-script-list {
  padding: 0 10px 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.script-block-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: 6px;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: 0 2px 0 rgba(0, 0, 0, 0.15);
}

.script-block-item.type-forward {
  background: var(--block-move);
}

.script-block-item.type-turnLeft,
.script-block-item.type-turnRight {
  background: var(--block-turn);
}

.script-block-item.type-wait {
  background: var(--block-wait);
}

.block-select,
.script-block-item.type-ifRobotWait,
.script-block-item.type-ifBlockedTurn {
  background: #ec4899;
}

/* 절차적 사고 4단계 스텝퍼 바 */
.procedural-stepper-bar {
  background: linear-gradient(90deg, #eff6ff, #f5f3ff);
  border: 1px solid #c7d2fe;
  border-radius: 12px;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.proc-step {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 9px;
  padding: 6px 11px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: all 0.15s;
  min-width: 145px;
}

.proc-step:hover {
  border-color: var(--primary);
}

.proc-step.active {
  background: #1e40af;
  color: #ffffff;
  border-color: #1e3a8a;
  box-shadow: 0 2px 8px rgba(30, 64, 175, 0.25);
}

.proc-num {
  font-size: 0.68rem;
  font-weight: 800;
  color: #2563eb;
}

.proc-step.active .proc-num {
  color: #93c5fd;
}

.proc-step strong {
  font-size: 0.83rem;
}

.proc-step small {
  font-size: 0.71rem;
  color: #64748b;
}

.proc-step.active small {
  color: #e2e8f0;
}

.proc-arrow {
  color: #6366f1;
  font-weight: 800;
  font-size: 0.9rem;
}

.proc-tip-box {
  flex: 1;
  min-width: 240px;
  background: #ffffff;
  border-left: 4px solid #6366f1;
  padding: 7px 12px;
  border-radius: 8px;
  font-size: 0.81rem;
  color: #1e293b;
}

.feedback-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.concept-check-pills {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}

.concept-pill {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  background: #e2e8f0;
  color: #64748b;
}

.concept-pill.active {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #86efac;
}

.script-block-repeat-group {
  background: #fef3c7;
  border: 2px solid var(--block-flow);
  border-radius: 8px;
  overflow: hidden;
}

.repeat-header {
  background: var(--block-flow);
  color: #fff;
  padding: 5px 10px;
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.repeat-children {
  padding: 6px 6px 6px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.repeat-add-bar {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 4px;
}

.repeat-mini-btn {
  background: #fff;
  border: 1px solid #d97706;
  color: #92400e;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
}

.block-inline-input {
  width: 44px;
  padding: 1px 4px;
  border-radius: 4px;
  border: none;
  font-weight: 800;
  text-align: center;
  margin: 0 3px;
}

.block-del-btn {
  background: rgba(0, 0, 0, 0.2);
  border: none;
  color: #fff;
  width: 20px;
  height: 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.72rem;
}

/* 학생 화면 통제 오버레이 */
#studentSection {
  position: relative;
}

.classroom-overlay {
  position: fixed;
  inset: 52px 0 0 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.app-container.split-view-mode .classroom-overlay {
  position: absolute;
  inset: 0;
}

.lock-overlay {
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(6px);
  color: #fff;
}

.overlay-card {
  background: #1e293b;
  border: 2px solid #f59e0b;
  border-radius: 18px;
  padding: 36px;
  text-align: center;
  max-width: 480px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

.lock-icon {
  font-size: 3.5rem;
  margin-bottom: 12px;
}

.lock-sub-pill {
  display: inline-block;
  margin-top: 16px;
  background: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 0.8rem;
  font-weight: 700;
}

.slide-sync-overlay {
  background: rgba(15, 23, 42, 0.88);
}

.synced-slide-container {
  background: #fff;
  width: 100%;
  max-width: 960px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.synced-slide-topbar {
  background: #7c3aed;
  color: #fff;
  padding: 10px 18px;
  display: flex;
  justify-content: space-between;
  font-weight: 700;
  font-size: 0.88rem;
}

.synced-slide-body {
  padding: 28px;
  min-height: 420px;
}

/* 3. 교사용 컨트롤러 및 대시보드 */
.teacher-control-bar {
  background: linear-gradient(90deg, #1e1b4b, #312e81);
  color: #fff;
  padding: 12px 16px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.class-meta-box {
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-label {
  font-size: 0.78rem;
  color: #c4b5fd;
}

.code-display {
  background: #4c1d95;
  border: 1px solid #a78bfa;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 1rem;
  letter-spacing: 1.5px;
  cursor: pointer;
}

.classroom-mode-group,
.level-gate-group {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.control-group-label {
  font-size: 0.8rem;
  color: #ddd6fe;
  font-weight: 600;
}

.ctrl-btn {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.ctrl-btn.active {
  background: #22c55e;
  border-color: #86efac;
  color: #052e16;
}

.ctrl-btn.danger.active {
  background: #ef4444;
  border-color: #fca5a5;
  color: #fff;
}

.ctrl-select {
  padding: 6px 10px;
  border-radius: 7px;
  border: none;
  font-weight: 700;
  font-size: 0.82rem;
}

.btn-broadcast-run {
  background: #f59e0b;
  color: #0f172a;
  font-weight: 800;
}

.btn-broadcast-run:hover {
  background: #fbbf24;
}


.t-tab {
  padding: 9px 16px;
  border-radius: 10px;
  border: 1px solid #cbd5e1;
  background: #fff;
  font-weight: 700;
  font-size: 0.88rem;
  cursor: pointer;
}

.t-tab.active {
  background: var(--teacher-accent);
  color: #fff;
  border-color: var(--teacher-accent);
}

.teacher-tab-pane {
  display: none;
}

.teacher-tab-pane.active {
  display: block;
}

.kpi-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 14px;
}

.app-container.split-view-mode .kpi-row {
  grid-template-columns: repeat(2, 1fr);
}

.kpi-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px;
}

.kpi-label {
  font-size: 0.78rem;
  color: var(--text-sub);
  font-weight: 600;
}

.kpi-value {
  font-size: 1.35rem;
  font-weight: 800;
  margin: 4px 0;
}

.kpi-sub {
  font-size: 0.76rem;
  color: #64748b;
}

.accent-green {
  color: #16a34a;
}

.accent-blue {
  color: #2563eb;
}

.accent-warn {
  color: #dc2626;
}

.dashboard-main-grid {
  display: grid;
  grid-template-columns: 1.45fr 0.85fr;
  gap: 14px;
}

.app-container.split-view-mode .dashboard-main-grid {
  grid-template-columns: 1fr;
}

.card-header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.card-header-row h3 {
  font-size: 0.96rem;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
}

.table-responsive,
.log-table-wrapper {
  overflow-x: auto;
}

.student-matrix-table,
.log-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

.student-matrix-table th,
.student-matrix-table td,
.log-table th,
.log-table td {
  padding: 8px 10px;
  border-bottom: 1px solid #e2e8f0;
  text-align: center;
}

.student-matrix-table th,
.log-table th {
  background: #f8fafc;
  font-weight: 700;
  color: #334155;
}

.student-matrix-table tr.selected-row {
  background: #eff6ff;
}

.student-matrix-table tr.need-help-row {
  background: #fef2f2;
}

.badge-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.74rem;
  font-weight: 700;
}

.badge-optimal {
  background: #dcfce7;
  color: #166534;
}

.badge-seq {
  background: #fef3c7;
  color: #92400e;
}

.badge-collision {
  background: #fee2e2;
  color: #991b1b;
}

/* 슬라이드 뷰 */
.slides-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 14px;
}

.app-container.split-view-mode .slides-layout {
  grid-template-columns: 1fr;
}

.slide-thumb-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}

.slide-thumb-btn {
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #cbd5e1;
  background: #f8fafc;
  cursor: pointer;
  font-size: 0.83rem;
}

.slide-thumb-btn.active {
  background: #ede9fe;
  border-color: var(--teacher-accent);
  color: #4c1d95;
  font-weight: 700;
}

.slide-stage-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid #e2e8f0;
}

.slide-counter {
  margin: 0 12px;
  font-weight: 800;
}

.teacher-slide-canvas {
  background: linear-gradient(135deg, #f8fafc, #eff6ff);
  border: 2px solid #cbd5e1;
  border-radius: 14px;
  padding: 28px;
  min-height: 390px;
}

.slide-deck-box h2 {
  font-size: 1.45rem;
  color: #1e3a8a;
  margin-bottom: 12px;
}

.slide-deck-box .slide-tag {
  display: inline-block;
  background: #2563eb;
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  margin-bottom: 8px;
}

.slide-point-list {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.98rem;
}

.slide-callout {
  margin-top: 18px;
  padding: 14px;
  background: #fff;
  border-left: 5px solid #7c3aed;
  border-radius: 8px;
  font-weight: 600;
}

/* 모달 */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-box {
  background: #fff;
  border-radius: 16px;
  max-width: 680px;
  width: 100%;
  overflow: hidden;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.modal-header,
.modal-footer {
  padding: 14px 20px;
  background: #f8fafc;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e2e8f0;
}

.modal-footer {
  border-bottom: none;
  border-top: 1px solid #e2e8f0;
  justify-content: flex-end;
  gap: 8px;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
}

.modal-body {
  padding: 20px;
}

.modal-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  margin-bottom: 14px;
}

.hw-pair-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 14px;
}

.hw-robot-card {
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  padding: 12px;
  background: #f8fafc;
}

.hw-robot-title {
  font-weight: 800;
  margin-bottom: 4px;
}

.hw-state {
  font-size: 0.82rem;
  color: #64748b;
  margin-bottom: 4px;
}

.hw-state.connected {
  color: #16a34a;
  font-weight: 700;
}

.hw-sensor-info {
  font-size: 0.76rem;
  color: #475569;
  margin-bottom: 10px;
}

.hw-packet-monitor {
  background: #0f172a;
  color: #38bdf8;
  border-radius: 10px;
  padding: 12px;
}

.monitor-header {
  font-size: 0.78rem;
  color: #94a3b8;
  margin-bottom: 6px;
  font-weight: 700;
}

.packet-log {
  font-family: Consolas, monospace;
  font-size: 0.78rem;
  white-space: pre-wrap;
  max-height: 110px;
  overflow-y: auto;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}

@media (max-width: 1150px) {
  .landing-grid,
  .student-workspace,
  .dashboard-main-grid,
  .app-container.split-view-mode {
    grid-template-columns: 1fr;
  }
}

.robot-link { display:inline-block; padding:4px 10px; border-radius:999px; background:#fff7e6; color:#92400e; font-size:12px; font-weight:700; text-decoration:none; border:1px solid #fcd34d; }
.robot-link:hover { background:#fde68a; }
.robot-banner { margin:0 0 12px; padding:10px 14px; border-radius:10px; background:#fff7e6; border:1px solid #fcd34d; color:#78350f; font-size:14px; }
.robot-banner a { color:#b45309; }

/* 접속 주소별 입구 분리: #/student(학생용) · #/teacher(교사용) · 기본(전체 데모) */
body.mode-student #btnViewTeacher, body.mode-student #btnViewSplit, body.mode-student .teacher-login-card,
body.mode-teacher #btnViewStudent, body.mode-teacher .student-login-card { display: none !important; }
body:not(.mode-all) .only-all { display: none !important; }
body.mode-student .landing-grid, body.mode-teacher .landing-grid { grid-template-columns: minmax(0, 720px); justify-content: center; }
.entry-links { margin: 0 0 12px; padding: 8px 14px; border-radius: 10px; background: #eef2ff; border: 1px solid #c7d2fe; color: #3730a3; font-size: 13px; }
.entry-links code { font-weight: 700; }
.entry-note { display: block; margin-top: 2px; color: #6366f1; font-size: 12px; }

/* 실시간 학급 상태 바 */
.live-status { display:flex; align-items:center; gap:10px; flex-wrap:wrap; padding:6px 12px; border-radius:10px; background:rgba(255,255,255,.12); font-size:13px; }
.live-status code { font-weight:800; letter-spacing:.5px; background:rgba(255,255,255,.2); padding:1px 6px; border-radius:6px; }
.live-dot { font-size:14px; } .live-dot.on { color:#22c55e; } .live-dot.off { color:#f59e0b; }
.hidden { display:none !important; }

/* 첫 화면 히어로 */
.hero { display:grid; grid-template-columns:minmax(0,1.1fr) minmax(0,0.9fr); gap:32px; align-items:center; margin:4px 0 20px; padding:36px 40px; border-radius:20px; background:linear-gradient(135deg,#eff6ff 0%,#ffffff 55%,#fff7ed 100%); border:1px solid var(--border-color); }
.hero-eyebrow { display:inline-block; padding:4px 12px; border-radius:999px; background:#dbeafe; color:#1e40af; font-size:13px; font-weight:700; }
.hero-title { margin:14px 0 12px; font-size:clamp(2rem,4.2vw,3.2rem); line-height:1.15; font-weight:900; letter-spacing:-0.02em; color:var(--text-main); }
.hero-accent { background:linear-gradient(90deg,var(--robot-a),var(--robot-b)); -webkit-background-clip:text; background-clip:text; color:transparent; }
.hero-desc { margin:0 0 22px; max-width:34em; color:var(--text-sub); font-size:1.05rem; line-height:1.65; }
.hero-cta { display:flex; flex-wrap:wrap; gap:10px; }
.hero-points { display:flex; flex-wrap:wrap; gap:8px 18px; margin:18px 0 0; padding:0; list-style:none; color:var(--text-sub); font-size:14px; font-weight:600; }
.hero-visual { margin:0; }
.hero-visual canvas { display:block; width:100%; max-width:560px; height:auto; margin:0 auto; background:#fff; border:1px solid var(--border-color); border-radius:18px; box-shadow:0 18px 30px rgba(15,23,42,.14); }
.hero-visual figcaption { margin-top:10px; text-align:center; color:var(--text-sub); font-size:13px; font-weight:600; }
@media (max-width: 860px) {
  .hero { grid-template-columns:1fr; padding:24px 16px; gap:20px; }
  .hero-visual { order:-1; }
  .hero-cta .btn { flex:1 1 100%; }
}
body.mode-student .hero-cta-teacher, body.mode-teacher .hero-cta-student { display:none !important; }

/* 실물 말판 출력 */
.map-print-box { max-width: 900px; max-height: calc(100vh - 40px); display: flex; flex-direction: column; }
.map-print-box .modal-body { overflow-y: auto; }
.print-warning { margin-bottom: 14px; padding: 12px 16px; border-radius: 12px; background: #fef2f2; border: 2px solid #fca5a5; color: #7f1d1d; font-size: 0.88rem; }
.print-warning > strong { display: block; font-size: 1rem; color: #b91c1c; margin-bottom: 6px; }
.print-warning ul { margin: 0; padding-left: 18px; line-height: 1.6; }
.print-options { display: flex; flex-wrap: wrap; gap: 10px 18px; align-items: center; margin-bottom: 12px; font-size: 0.88rem; font-weight: 700; }
.print-options select { margin-left: 6px; max-width: 100%; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--border-color); }
.print-check { display: flex; align-items: center; gap: 6px; font-weight: 600; }
.map-print-preview { border: 1px solid var(--border-color); border-radius: 10px; background: #e2e8f0; padding: 12px; }
.map-print-preview svg { display: block; width: 100%; height: auto; box-shadow: 0 4px 14px rgba(15, 23, 42, .15); }
.print-footer-note { margin-right: auto; color: #b91c1c; font-size: 0.8rem; font-weight: 700; }
.map-print-sheet { display: none; }
@media print {
  body.printing-map { background: #fff !important; margin: 0; }
  body.printing-map > *:not(#mapPrintSheet) { display: none !important; }
  body.printing-map .map-print-sheet { display: block; }
  body.printing-map .map-print-sheet svg { display: block; }
}


/* 서비스 기능 벤토 그리드: 데스크톱 3열 · 태블릿 2열 · 모바일 1열 */
.feature-section { margin: 0 0 20px; }
.feature-section-title { margin: 0 0 12px; font-size: 1.25rem; font-weight: 800; color: var(--text-main); }
.bento-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); grid-auto-rows: minmax(150px, auto); gap: 16px; }
.bento-core-a { grid-column: 1 / span 2; grid-row: 1 / span 2; }
.bento-core-b { grid-column: 2 / span 2; grid-row: 3 / span 2; }
.feature-card { display: flex; flex-direction: column; padding: 20px; border-radius: 16px; background: var(--bg-card); border: 1px solid var(--border-color); transition: transform .15s ease, box-shadow .15s ease; }
.feature-card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(15, 23, 42, .08); }
.feature-icon { display: grid; place-items: center; width: 44px; height: 44px; margin-bottom: 12px; border-radius: 12px; background: #eff6ff; font-size: 1.35rem; }
.feature-card h3 { margin: 0 0 6px; font-size: 1rem; font-weight: 800; color: var(--text-main); }
.feature-card p { margin: 0; color: var(--text-sub); font-size: 0.88rem; line-height: 1.6; }
.bento-core { padding: 28px; }
.bento-core-a { background: linear-gradient(140deg, #eff6ff, #ffffff 70%); border-color: #bfdbfe; }
.bento-core-b { background: linear-gradient(140deg, #fff7ed, #ffffff 70%); border-color: #fed7aa; }
.bento-core .feature-icon { width: 56px; height: 56px; font-size: 1.8rem; background: #fff; box-shadow: 0 2px 8px rgba(15, 23, 42, .08); }
.bento-core h3 { font-size: 1.4rem; margin-bottom: 8px; }
.bento-core p { font-size: 0.95rem; max-width: 36em; }
.bento-tag { align-self: flex-start; margin-bottom: 12px; padding: 3px 10px; border-radius: 999px; background: var(--text-main); color: #fff; font-size: 0.72rem; font-weight: 800; }
.bento-blocks { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; margin-top: auto; padding-top: 20px; }
.bb { max-width: 100%; padding: 7px 14px; border-radius: 8px; color: #fff; font-size: 0.85rem; font-weight: 700; box-shadow: 0 2px 0 rgba(0, 0, 0, .15); }
.bb-move { background: var(--block-move); }
.bb-turn { background: var(--block-turn); margin-left: 16px; }
.bb-flow { background: var(--block-flow); }
.bb-wait { background: var(--block-wait); margin-left: 16px; }
.bento-steps { display: flex; flex-wrap: wrap; gap: 8px; margin: auto 0 0; padding: 20px 0 14px; list-style: none; }
.bento-steps li { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 10px; background: #fff; border: 1px solid #fed7aa; font-size: 0.85rem; font-weight: 600; color: #7c2d12; }
.bento-steps strong { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; background: var(--robot-b); color: #fff; font-size: 0.75rem; }
.bento-core-b .btn { align-self: flex-start; }
@media (max-width: 1023px) {
  .bento-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-rows: auto; }
  .bento-core-a, .bento-core-b { grid-column: 1 / -1; grid-row: auto; }
}
@media (max-width: 639px) {
  .bento-grid { grid-template-columns: 1fr; gap: 12px; }
  .feature-card, .bento-core { padding: 18px; }
  .bento-core h3 { font-size: 1.2rem; }
}
@media (prefers-reduced-motion: reduce) { .feature-card { transition: none; } .feature-card:hover { transform: none; } }

/* 스티키 헤더: 스크롤하면 슬림해지고, 좁은 화면에서는 탭이 가로 스크롤 */
:root { --header-h: 58px; }
.top-utility-bar { background: rgba(15, 23, 42, .94); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); transition: padding .2s ease, box-shadow .2s ease; }
.top-utility-bar.is-scrolled { padding-top: 6px; padding-bottom: 6px; box-shadow: 0 4px 18px rgba(0, 0, 0, .3); }
.top-utility-bar.is-scrolled .robot-link, .top-utility-bar.is-scrolled .privacy-pill { display: none; }
@media (max-width: 860px) {
  .top-utility-bar { flex-wrap: nowrap; flex-direction: column; align-items: stretch; gap: 8px; padding: 8px 16px; }
  .brand-group h1 { font-size: 0.95rem; }
  .top-utility-bar .robot-link, .top-utility-bar .privacy-pill { display: none; }
  .view-switcher { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; }
  .view-switcher::-webkit-scrollbar { display: none; }
  .switch-btn { flex: 0 0 auto; white-space: nowrap; }
}
@media (prefers-reduced-motion: reduce) { .top-utility-bar { transition: none; } }

/* 교사용 대시보드: 왼쪽 고정 사이드바 + 오른쪽 메인 */
.teacher-layout { display: grid; grid-template-columns: 232px minmax(0, 1fr); gap: 16px; align-items: start; }
.teacher-main { min-width: 0; }
.teacher-sidebar { position: sticky; top: calc(var(--header-h) + 16px); max-height: calc(100vh - var(--header-h) - 32px); overflow-y: auto; display: flex; flex-direction: column; gap: 6px; padding: 14px; border-radius: 14px; background: var(--bg-card); border: 1px solid var(--border-color); }
.sidebar-title { margin: 6px 4px 2px; color: var(--text-sub); font-size: 0.75rem; font-weight: 800; }
.sidebar-title:not(:first-child) { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border-color); }
.teacher-subnav, .sidebar-tools { display: flex; flex-direction: column; gap: 4px; }
.teacher-sidebar .t-tab { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; border-color: transparent; background: transparent; color: var(--text-main); }
.teacher-sidebar .t-tab:hover { background: #f5f3ff; }
.teacher-sidebar .t-tab.active { background: var(--teacher-accent); color: #fff; }
.t-ico { width: 1.4em; text-align: center; }
.t-count { margin-left: auto; padding: 1px 8px; border-radius: 999px; background: #ede9fe; color: #5b21b6; font-size: 0.75rem; }
.t-tab.active .t-count { background: rgba(255, 255, 255, .25); color: #fff; }
/* 좁은 화면 · 동시보기 분할 화면에서는 사이드바가 상단 가로 메뉴로 전환 */
@media (max-width: 900px) {
  .teacher-layout { grid-template-columns: 1fr; }
  .teacher-sidebar { top: var(--header-h); z-index: 50; max-height: none; flex-direction: row; align-items: center; overflow-x: auto; padding: 8px; scrollbar-width: none; }
  .teacher-sidebar::-webkit-scrollbar { display: none; }
  .sidebar-title { display: none; }
  .teacher-subnav, .sidebar-tools { flex-direction: row; }
  .teacher-sidebar .t-tab { width: auto; white-space: nowrap; }
}
.app-container.split-view-mode .teacher-layout { grid-template-columns: 1fr; }
.app-container.split-view-mode .teacher-sidebar { position: static; max-height: none; flex-direction: row; flex-wrap: wrap; }
.app-container.split-view-mode .sidebar-title { display: none; }
.app-container.split-view-mode .teacher-subnav, .app-container.split-view-mode .sidebar-tools { flex-direction: row; flex-wrap: wrap; }
.app-container.split-view-mode .teacher-sidebar .t-tab { width: auto; }

/* 교사 탭: 지도안 내려받기 */
.lesson-plan-list { display: grid; gap: 10px; margin-top: 12px; }
.lesson-plan-item { display: grid; grid-template-columns: 64px minmax(0, 1fr) auto; align-items: center; gap: 14px; padding: 12px 14px; border: 1px solid var(--border-color); border-radius: 12px; background: var(--bg-card); }
.lesson-plan-no { display: grid; place-items: center; height: 56px; border-radius: 10px; background: #eef2ff; color: #3730a3; font-size: 1.15rem; font-weight: 900; line-height: 1.1; }
.lesson-plan-no small { font-size: 0.7rem; font-weight: 700; }
.lesson-plan-stage { display: inline-block; padding: 2px 8px; border-radius: 999px; background: #f1f5f9; color: var(--text-sub); font-size: 0.75rem; font-weight: 700; }
.lesson-plan-info h4 { margin: 4px 0 0; font-size: 1rem; color: var(--text-main); }
.lesson-plan-actions { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.lesson-plan-actions a { text-decoration: none; }
@media (max-width: 639px) {
  .lesson-plan-item { grid-template-columns: 52px minmax(0, 1fr); }
  .lesson-plan-actions { grid-column: 1 / -1; justify-content: stretch; }
  .lesson-plan-actions a { flex: 1 1 0; text-align: center; }
}

/* ===== 실습 방식(1인 2로봇 / 2인 1조) + 출발 방식(동시 / 개별) 바 ===== */
.start-mode-bar {
  margin-top: 10px;
  padding: 10px 12px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.start-mode-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.start-mode-label {
  font-size: 0.78rem;
  font-weight: 800;
  color: #475569;
  margin-right: 2px;
}
.seg-group {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}
.seg-group + .seg-group { margin-left: 10px; }
.seg-btn {
  border: 1px solid #cbd5e1;
  background: #fff;
  color: #334155;
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}
.seg-btn:hover { border-color: var(--primary); }
.seg-btn.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.seg-btn.robot-a.active { background: #dc2626; border-color: #dc2626; }
.seg-btn.robot-b.active { background: #2563eb; border-color: #2563eb; }
.btn-start-a { background: #fee2e2; color: #991b1b; border: 1px solid #fca5a5; }
.btn-start-a:hover { background: #fecaca; }
.btn-start-b { background: #dbeafe; color: #1e3a8a; border: 1px solid #93c5fd; }
.btn-start-b:hover { background: #bfdbfe; }
.start-mode-hint {
  margin: 0;
  font-size: 0.78rem;
  color: #475569;
  line-height: 1.5;
}
.start-mode-bar .pair-only { display: none; }
.start-mode-bar.is-pair .pair-only { display: inline-flex; }
.start-mode-bar.is-pair .solo-only { display: none; }
.start-countdown {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 5rem;
  font-weight: 900;
  color: #fff;
  text-shadow: 0 4px 18px rgba(15, 23, 42, 0.6);
  background: rgba(15, 23, 42, 0.35);
  border-radius: 10px;
  pointer-events: none;
}

/* 레벨 로봇 수(2·4·6대)만큼 만드는 로봇 버튼 — 색은 --robot-color (app.js ROBOT_COLORS) */
.robot-pick-group, .solo-start-group { display: inline-flex; gap: 4px; flex-wrap: wrap; }
.seg-btn.robot-pick.active { background: var(--robot-color); border-color: var(--robot-color); color: #fff; }
.btn-start-robot { background: #fff; color: var(--robot-color, #334155); border: 1.5px solid var(--robot-color, #cbd5e1); font-weight: 700; }
.btn-start-robot:hover { background: #f8fafc; }
/* 교사 대시보드: 레벨별 진행 칸 */
.lv-chip-row { display: flex; flex-wrap: wrap; gap: 2px; justify-content: center; max-width: 260px; margin: 0 auto; }
.lv-chip { min-width: 20px; padding: 1px 3px; border-radius: 4px; font-size: 0.7rem; background: #f1f5f9; color: #94a3b8; }
.lv-chip.trying { background: #fef9c3; color: #854d0e; }
.lv-chip.cleared { background: #dcfce7; color: #166534; font-weight: 700; }


/* 예시(충돌·순차·최적) 버튼·안내: .example-only 로 묶어 둔다. 학생 화면에서 숨기려면
   body.mode-student .example-only { display: none !important; } 를 다시 넣으면 된다 (2026-10-29 학생에게도 보이기로 결정) */

/* ---- 교사용 창 나누기 (/t?w=board 전자칠판 실행 창, /t?w=dash 대시보드 창) ---- */
body.twin-board .teacher-sidebar, body.twin-dash .teacher-sidebar .twin-open,
body.twin-board .top-utility-bar { display: none !important; }
body.twin-board .teacher-layout { grid-template-columns: 1fr; }
/* 전자칠판: 슬라이드 탭만, 글자를 크게 */
body.twin-board .teacher-tab-pane:not(#teacherTabSlides) { display: none !important; }
body.twin-board #teacherTabSlides { display: block !important; }
body.twin-board .slides-layout { grid-template-columns: 220px minmax(0, 1fr); }
body.twin-board .teacher-slide-canvas { min-height: calc(100vh - 260px); padding: 40px 48px; font-size: 1.35rem; }
body.twin-board .slide-deck-box h2 { font-size: 2.3rem; }
body.twin-board .slide-point-list { font-size: 1.45rem; gap: 16px; }
body.twin-board .slide-stage-toolbar .btn { font-size: 1.1rem; padding: 12px 20px; }
body.twin-board .teacher-control-bar .ctrl-btn, body.twin-board .btn-broadcast-run { font-size: 1.05rem; padding: 12px 18px; }
/* 대시보드 창: 슬라이드 송출 탭은 전자칠판 창에서 하므로 숨긴다 */
body.twin-dash .t-tab[data-ttab="slides"], body.twin-dash #teacherTabSlides { display: none !important; }