/* Workspace Layout, Canvas, and Left Panel Styles */

/* App Wrapper */
.arc-app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  width: 100vw;
  background-color: var(--bg-app);
}

/* =========================================================
   TOP BAR
========================================================= */
.arc-topbar {
  height: var(--topbar-height);
  background-color: var(--bg-surface-1);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  z-index: 50;
  user-select: none;
}

.topbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-name .brand-symbol {
  width: 18px;
  height: 18px;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  border-radius: 4px;
  display: inline-block;
}

.brand-subtitle {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  border-left: 1px solid var(--border-default);
  padding-left: 10px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.topbar-center {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* AI Status Pill */
.ai-status-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  background: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.ai-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--status-success);
}
.ai-status-dot.demo {
  background-color: var(--status-locked);
}

.lesson-meta-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-surface-2);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 12px;
}

.lesson-title-display {
  font-weight: 500;
  color: var(--text-primary);
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--status-success);
}
.status-dot.saving {
  background-color: var(--status-locked);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

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

/* =========================================================
   WORKSPACE THREE-COLUMN LAYOUT
========================================================= */
.arc-workspace-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100vh - var(--topbar-height));
}

/* LEFT PANEL */
.arc-left-panel {
  width: var(--left-panel-width);
  background-color: var(--bg-surface-1);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  user-select: none;
}

.panel-section {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border-subtle);
}

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

.section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* Student Profile Card */
.student-profile-box {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  position: relative;
  transition: border-color 0.15s ease;
}
.student-profile-box:hover {
  border-color: var(--border-focus);
}

.student-main-info {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 6px;
}

.student-name-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.student-role-company {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.4;
  margin-bottom: 8px;
}

.student-notes-preview {
  font-size: 11px;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.4;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 6px;
  margin-top: 6px;
}

/* Multi-select Tags / Chips */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.select-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 9px;
  font-size: 12px;
  border-radius: 20px;
  background-color: var(--bg-surface-2);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
  cursor: pointer;
  transition: all 0.12s ease-in-out;
  user-select: none;
}

.select-tag:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-focus);
}

.select-tag.selected {
  background-color: var(--accent-surface);
  color: var(--accent-text);
  border-color: rgba(99, 102, 241, 0.45);
  font-weight: 500;
}

.select-tag .tag-indicator {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--text-muted);
}
.select-tag.selected .tag-indicator {
  background-color: var(--accent-primary);
  box-shadow: 0 0 6px var(--accent-primary);
}

.tag-add-btn {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px 8px;
  font-size: 11px;
  border-radius: 20px;
  background-color: transparent;
  color: var(--text-muted);
  border: 1px dashed var(--border-default);
  cursor: pointer;
  transition: all 0.12s ease;
}
.tag-add-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-secondary);
}

/* Context Pills */
.context-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  font-size: 11px;
  border-radius: 4px;
  background-color: #1e2433;
  color: #93c5fd;
  border: 1px solid #2e3b52;
}

/* Objective Card */
.objective-display-box {
  background: var(--bg-surface-2);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.45;
  font-weight: 450;
  cursor: pointer;
}
.objective-display-box:hover {
  border-color: var(--border-focus);
}

/* =========================================================
   CENTRE PANEL: LESSON CANVAS
========================================================= */
.arc-centre-panel {
  flex: 1;
  background-color: var(--bg-app);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  position: relative;
}

.canvas-container {
  max-width: 880px;
  width: 100%;
  margin: 0 auto;
  padding: 32px 24px 80px 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Canvas Header Banner */
.canvas-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 18px;
  margin-bottom: 8px;
}

.canvas-lesson-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.canvas-meta-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text-secondary);
}

/* Activity Block Card */
.activity-block {
  background: var(--bg-surface-1);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: relative;
  transition: all 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
}

.activity-block:hover {
  border-color: var(--border-focus);
  background: var(--bg-surface-hover);
}

.activity-block.selected {
  border-color: var(--accent-primary);
  background: var(--bg-surface-2);
  box-shadow: 0 0 0 1px var(--accent-primary), var(--shadow-md);
}

.activity-block.locked {
  border-left: 3px solid var(--status-locked);
}

.block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.block-title-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.block-order-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  width: 20px;
}

.block-title-text {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.block-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  opacity: 0.85;
  transition: opacity 0.15s ease;
}
.activity-block:hover .block-controls,
.activity-block.selected .block-controls {
  opacity: 1;
}

/* Lock Button */
.btn-lock {
  padding: 3px 8px;
  font-size: 11px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-default);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.12s ease;
}
.btn-lock:hover {
  border-color: var(--status-locked);
  color: var(--status-locked);
}
.btn-lock.is-locked {
  background: var(--status-locked-bg);
  color: var(--status-locked);
  border-color: var(--status-locked-border);
  font-weight: 500;
}

/* Structured Block Content Renderers */
.block-content-body {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.55;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.block-instruction-text {
  color: var(--text-muted);
  font-size: 12px;
  font-style: italic;
}

/* Question List */
.structured-question-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 4px;
}
.question-item {
  display: flex;
  gap: 8px;
  color: var(--text-primary);
  font-weight: 400;
}
.question-num {
  color: var(--accent-primary);
  font-weight: 600;
  font-family: var(--font-mono);
}

/* Phrases List (Language Focus) */
.phrase-deck {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.phrase-card {
  background: var(--bg-surface-3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.phrase-main {
  font-weight: 600;
  color: #e0e7ff;
  font-size: 13px;
}
.phrase-details {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--text-muted);
}
.phrase-register {
  font-family: var(--font-mono);
  color: var(--accent-text);
}

/* Controlled Practice Items */
.practice-deck {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.practice-card {
  background: var(--bg-surface-3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.practice-prompt {
  color: #f87171;
  font-size: 12px;
}
.practice-answer {
  color: #34d399;
  font-size: 13px;
  font-weight: 500;
}

/* Role Play Structured Grid */
.roleplay-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  background: var(--bg-surface-3);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px;
}
.role-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.role-box-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--accent-text);
  letter-spacing: 0.04em;
}
.role-box-text {
  font-size: 12px;
  color: var(--text-primary);
  line-height: 1.45;
}

.roleplay-scenario-box {
  background: var(--bg-surface-2);
  border-left: 2px solid var(--accent-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-primary);
}

.roleplay-complication-box {
  background: rgba(245, 158, 11, 0.08);
  border-left: 2px solid var(--status-locked);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: #fde68a;
}

.success-criteria-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 4px;
}
.criteria-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}
.criteria-item::before {
  content: "✓";
  color: var(--status-success);
  font-weight: bold;
}

/* Add Block Placeholder */
.add-block-placeholder {
  border: 1px dashed var(--border-default);
  border-radius: var(--radius-lg);
  padding: 14px;
  text-align: center;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}
.add-block-placeholder:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  background: var(--bg-surface-1);
}