/* =============================================================================
   UBIide Components System - Buttons, Trees, Drag-Drop, Modals & Toasts
   ============================================================================= */

/* =============================================================================
   Buttons
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.80rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: #0369a1;
}

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

.btn-success {
  background: var(--accent-emerald);
  color: #ffffff;
  border-color: #059669;
}

.btn-success:hover {
  background: var(--accent-emerald-hover);
}

.btn-danger {
  background: var(--accent-rose);
  color: #ffffff;
  border-color: #be123c;
}

.btn-danger:hover {
  background: var(--accent-rose-hover);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  color: var(--text-white);
  border-color: var(--accent-cyan);
}

.btn-secondary.linter-active {
  border-color: rgba(16, 185, 129, 0.45);
  color: var(--accent-emerald);
}

.btn-secondary.linter-active:hover {
  border-color: var(--accent-emerald);
  color: var(--accent-emerald-hover);
}

.btn-secondary.linter-inactive {
  color: var(--text-muted);
  opacity: 0.85;
}

[data-theme="light"] .btn-secondary.linter-active {
  border-color: rgba(5, 150, 105, 0.45);
  color: #059669;
  background: rgba(16, 185, 129, 0.08);
}

[data-theme="light"] .btn-secondary.linter-inactive {
  color: #64748b;
}

.btn-secondary.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: #0369a1;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}

.btn-secondary.active:hover {
  background: var(--accent-primary-hover);
  color: #ffffff;
}

[data-theme="light"] .btn-secondary.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: #0284c7;
}

.btn-icon {
  padding: 4px 7px;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
  cursor: pointer;
}

.btn-icon:hover {
  color: var(--text-white);
  background: var(--bg-card-hover);
  border-color: var(--border-color);
}

.btn-danger-icon:hover {
  color: var(--accent-rose) !important;
  background: rgba(244, 63, 94, 0.15) !important;
  border-color: rgba(244, 63, 94, 0.35) !important;
}

.btn-xs {
  font-size: 0.72rem;
  padding: 3px 8px;
}

/* =============================================================================
   File Tree Components (PC and Pico)
   ============================================================================= */
.tree-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 30px 16px;
  color: var(--text-muted);
  gap: 12px;
  height: 100%;
}

.tree-empty-icon {
  font-size: 2.2rem;
  opacity: 0.8;
}

.tree-empty-title {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-white);
}

.tree-empty-desc {
  font-size: 0.76rem;
  color: var(--text-dim);
  max-width: 200px;
  line-height: 1.4;
}

.tree-container {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.tree-node {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 6px;
  border-radius: var(--radius-xs);
  font-size: 0.78rem;
  font-family: var(--font-code);
  color: var(--text-main);
  cursor: pointer;
  transition: background-color 0.12s ease;
  position: relative;
}

.tree-node:hover {
  background: var(--bg-card-hover);
  color: var(--text-white);
}

.tree-node.active {
  background: var(--bg-active);
  color: var(--text-white);
  border-left: 2px solid var(--accent-cyan);
}

.tree-node-main {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.tree-node-icon {
  font-size: 0.90rem;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
}

.tree-node-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tree-node-badge {
  font-size: 0.68rem;
  color: var(--text-dim);
  background: var(--bg-input);
  padding: 1px 5px;
  border-radius: 9999px;
  font-family: var(--font-code);
  flex-shrink: 0;
  margin-left: 4px;
}

.tree-node-actions {
  display: none;
  align-items: center;
  gap: 2px;
  margin-left: 4px;
  flex-shrink: 0;
}

.tree-node:hover .tree-node-actions {
  display: flex;
}

.tree-action-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 0.75rem;
  line-height: 1;
}

.tree-action-btn:hover {
  color: var(--text-white);
  background: var(--bg-card);
}

.tree-action-btn.delete:hover {
  color: #ffffff;
  background: var(--accent-rose);
}

.tree-children {
  display: flex;
  flex-direction: column;
  padding-left: 14px;
  border-left: 1px dashed var(--border-color);
  margin-left: 7px;
  gap: 1px;
}

.tree-children.collapsed {
  display: none;
}

/* Draggable styling */
.tree-node[draggable="true"] {
  cursor: grab;
}

.tree-node.dragging {
  opacity: 0.4;
  outline: 1px dashed var(--accent-cyan);
}

/* =============================================================================
   Drag & Drop Target Zones
   ============================================================================= */
.dropzone-pico {
  position: relative;
  transition: all 0.2s ease;
}

.dropzone-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(2, 132, 199, 0.88);
  backdrop-filter: blur(4px);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  border: 2px dashed #ffffff;
  border-radius: var(--radius-sm);
  color: #ffffff;
  text-align: center;
  padding: 16px;
  pointer-events: none;
  animation: fadeIn 0.15s ease;
}

.dropzone-overlay.active {
  display: flex;
}

.dropzone-icon {
  font-size: 2.4rem;
  margin-bottom: 8px;
  animation: bounceDrop 0.8s infinite alternate;
}

@keyframes bounceDrop {
  0% { transform: translateY(0); }
  100% { transform: translateY(-8px); }
}

.dropzone-title {
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.dropzone-subtitle {
  font-size: 0.75rem;
  opacity: 0.9;
}

/* Quick Flash Zone at bottom of Pico explorer */
.pico-quick-flash {
  padding: 8px 10px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.pico-quick-flash-title {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* =============================================================================
   Diagnostics Panel Items
   ============================================================================= */
.diagnostic-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 4px 6px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: background-color 0.1s ease;
  line-height: 1.35;
}

.diagnostic-item:hover {
  background: var(--bg-card-hover);
}

.diag-badge {
  font-size: 0.68rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 9999px;
  text-transform: uppercase;
  flex-shrink: 0;
}

.diag-error .diag-badge {
  background: rgba(244, 63, 94, 0.2);
  color: var(--accent-rose);
  border: 1px solid rgba(244, 63, 94, 0.4);
}

.diag-warning .diag-badge {
  background: rgba(245, 158, 11, 0.2);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.diag-info .diag-badge {
  background: rgba(56, 189, 248, 0.2);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.4);
}

.diag-loc {
  font-family: var(--font-code);
  font-size: 0.70rem;
  color: var(--text-dim);
  flex-shrink: 0;
  min-width: 55px;
}

.diag-msg {
  color: var(--text-main);
  flex: 1;
}

/* =============================================================================
   Modals
   ============================================================================= */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(3px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
}

.modal-backdrop.open {
  display: flex;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalSlide 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalSlide {
  from { opacity: 0; transform: translateY(-12px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-white);
  display: flex;
  align-items: center;
  gap: 8px;
}

.modal-close-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.2rem;
  cursor: pointer;
  border-radius: 4px;
  padding: 2px 6px;
}

.modal-close-btn:hover {
  color: var(--text-white);
  background: var(--bg-card-hover);
}

.modal-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.modal-footer {
  padding: 12px 18px;
  background: var(--bg-sidebar);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

/* Forms & Inputs */
.form-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.form-input, .form-select {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 8px 12px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.2);
}

/* =============================================================================
   Toast Notifications
   ============================================================================= */
.toast-container {
  position: fixed;
  bottom: 34px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 300;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  box-shadow: var(--shadow-lg);
  font-size: 0.80rem;
  color: var(--text-white);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 260px;
  max-width: 380px;
  animation: toastIn 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.toast-success {
  border-left: 3px solid var(--accent-emerald);
}

.toast.toast-error {
  border-left: 3px solid var(--accent-rose);
}

.toast.toast-info {
  border-left: 3px solid var(--accent-cyan);
}

.toast.toast-warn {
  border-left: 3px solid var(--accent-amber);
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}