:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: rgba(30, 41, 59, 0.85);
  --border-color: rgba(255, 255, 255, 0.1);
  --border-focus: #38bdf8;
  --accent-primary: #0284c7;
  --accent-hover: #0369a1;
  --accent-glow: rgba(2, 132, 199, 0.35);
  --accent-success: #10b981;
  --accent-danger: #ef4444;
  --accent-warning: #f59e0b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --tg-bg: #0e1621;
  --tg-bubble: #182533;
  --tg-bubble-out: #2b5278;
  --tg-accent: #2b5278;
  --tg-btn-bg: #242f3d;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ─── Top Navbar ────────────────────────────────────────────── */
.navbar {
  height: 60px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  font-size: 1.5rem;
}

.brand-tag {
  background: var(--accent-primary);
  color: white;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 20px;
  text-transform: uppercase;
  font-weight: 800;
  letter-spacing: 0.05em;
}

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

.status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: rgba(0, 0, 0, 0.2);
  padding: 4px 12px;
  border-radius: 20px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-success);
}
.status-dot.unsaved {
  background: var(--accent-warning);
  box-shadow: 0 0 8px var(--accent-warning);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  outline: none;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 15px var(--accent-glow);
}
.btn-primary.has-changes {
  animation: pulse-btn 1.5s infinite;
}

@keyframes pulse-btn {
  0% { box-shadow: 0 0 0 0 rgba(2, 132, 199, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(2, 132, 199, 0); }
  100% { box-shadow: 0 0 0 0 rgba(2, 132, 199, 0); }
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background: #475569;
}

.btn-sm {
  padding: 4px 10px;
  font-size: 0.8rem;
}

.btn-danger {
  background: transparent;
  color: var(--accent-danger);
  border-color: rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
  background: var(--accent-danger);
  color: white;
}

/* ─── Main Layout ───────────────────────────────────────────── */
.app-container {
  display: flex;
  flex: 1;
  overflow: hidden;
  height: calc(100vh - 60px);
}

/* ─── Column 1: Categories Sidebar ─────────────────────────── */
.sidebar {
  width: 320px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.tree-view {
  flex: 1;
  overflow-y: auto;
  padding: 12px 8px;
}

.category-group {
  margin-bottom: 8px;
  border-radius: var(--radius-sm);
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
  border-radius: var(--radius-sm);
}
.category-header:hover {
  background: rgba(255, 255, 255, 0.05);
}

.cat-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
}

.cat-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0.6;
}
.category-header:hover .cat-actions {
  opacity: 1;
}

.subcategories-list {
  padding: 4px 8px 8px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.subcategory-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.subcategory-item:hover {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
}
.subcategory-item.active {
  background: rgba(2, 132, 199, 0.15);
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.4);
  font-weight: 600;
}

.sub-badge {
  font-size: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  padding: 1px 6px;
  border-radius: 10px;
  color: var(--text-dim);
}
.subcategory-item.active .sub-badge {
  background: var(--accent-primary);
  color: white;
}

/* ─── Column 2: Question Canvas / Builder ───────────────────── */
.canvas-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  overflow-y: auto;
  padding: 24px 32px;
}

.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.active-path {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.25rem;
  font-weight: 700;
}
.path-slash {
  color: var(--text-dim);
}

.questions-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 24px;
  min-height: 100px;
}

/* ─── Question Card (Draggable) ────────────────────────────── */
.question-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  transition: transform 0.15s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  position: relative;
}
.question-card:hover {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
}
.question-card.dragging {
  opacity: 0.4;
  transform: scale(0.98);
  border: 2px dashed var(--border-focus);
}
.question-card.drag-over {
  border-top: 3px solid var(--border-focus);
}

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

.drag-handle {
  cursor: grab;
  color: var(--text-dim);
  font-size: 1.2rem;
  user-select: none;
  padding: 0 4px;
}
.drag-handle:active {
  cursor: grabbing;
}

.card-index {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

.card-title-input {
  flex: 1;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.95rem;
  font-weight: 600;
  outline: none;
}
.card-title-input:focus {
  border-color: var(--border-focus);
}

.type-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.card-body {
  padding-left: 36px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.options-builder {
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.options-tags-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.option-tag {
  background: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border-color);
}
.option-tag .remove-opt {
  cursor: pointer;
  color: var(--text-dim);
}
.option-tag .remove-opt:hover {
  color: var(--accent-danger);
}

.add-option-row {
  display: flex;
  gap: 6px;
}
.add-option-input {
  flex: 1;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  color: var(--text-main);
  font-size: 0.85rem;
  outline: none;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.toggle-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.card-actions {
  display: flex;
  gap: 8px;
}

.add-question-btn {
  border: 2px dashed var(--border-color);
  background: rgba(30, 41, 59, 0.4);
  color: var(--text-muted);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.add-question-btn:hover {
  border-color: var(--accent-primary);
  color: #38bdf8;
  background: rgba(2, 132, 199, 0.05);
}

/* ─── Column 3: Live Telegram Preview ───────────────────────── */
.preview-sidebar {
  width: 380px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.preview-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.phone-mockup {
  flex: 1;
  background: var(--tg-bg);
  margin: 16px;
  border-radius: 24px;
  border: 4px solid #334155;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.phone-topbar {
  height: 44px;
  background: #17212b;
  border-bottom: 1px solid rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 10px;
}
.bot-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #2b5278;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
}
.bot-info {
  display: flex;
  flex-direction: column;
}
.bot-name {
  font-size: 0.82rem;
  font-weight: 600;
  color: white;
}
.bot-status {
  font-size: 0.68rem;
  color: #6c7883;
}

.phone-chat {
  flex: 1;
  padding: 16px 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tg-bubble {
  background: var(--tg-bubble);
  border-radius: 12px 12px 12px 2px;
  padding: 10px 12px;
  font-size: 0.82rem;
  color: #f5f5f5;
  max-width: 90%;
  align-self: flex-start;
  box-shadow: 0 1px 2px rgba(0,0,0,0.3);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tg-inline-buttons {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 4px;
}

.tg-btn-row {
  display: flex;
  gap: 4px;
}

.tg-btn {
  flex: 1;
  background: var(--tg-btn-bg);
  color: #6ab2f2;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 8px;
  border-radius: 6px;
  text-align: center;
  border: none;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--text-dim);
  text-align: center;
  gap: 12px;
}
.empty-icon {
  font-size: 3rem;
}

/* Modal styles */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 440px;
  max-width: 90%;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.form-input {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-main);
  font-size: 0.95rem;
  outline: none;
}
.form-input:focus {
  border-color: var(--border-focus);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 8px;
}