/* Reset & Root */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-root: #141414;
  --bg-sidebar: #1c1c1c;
  --bg-card-0: #252525;
  --bg-card-1: #2e2e2e;
  --bg-card-2: #373737;
  --bg-input: #1a1a1a;
  --border: rgba(255, 255, 255, 0.07);
  --text: #cccccc;
  --text-muted: #666666;
  --text-label: #888888;
  --accent: #4d9fff;
  --danger: #e05252;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "Fira Code", Consolas, monospace;
  --radius: 6px;
  --radius-sm: 4px;
}

html,
body {
  height: 100%;
  overflow: hidden;
  background: var(--bg-root);
  color: var(--text);
  font-family: var(--font);
  font-size: 12px;
}

/* Remove number input spinners */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield;
}

/* Layout */
#app {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

#preview-panel {
  flex: 0 0 60%;
  display: flex;
  flex-direction: column;
  background: #0e0e0e;
  overflow: hidden;
  min-height: 0;
}

/* Preview toolbar */
#preview-toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: var(--bg-root);
  border-bottom: 1px solid var(--border);
}

#preview-presets {
  display: flex;
  gap: 4px;
}

.preset-btn {
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  transition:
    color 0.1s,
    border-color 0.1s,
    background 0.1s;
}
.preset-btn:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.18);
}
.preset-btn.active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.08);
}

#preview-size-label {
  color: var(--text-muted);
  font-size: 10px;
  font-family: var(--font-mono);
  margin-left: 4px;
}

/* Preview stage - centers the resizable wrapper */
#preview-stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

/* The resizable iframe wrapper */
#preview-iframe-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
  flex-shrink: 0;
}

#preview-iframe-wrapper.framed {
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.1),
    0 8px 40px rgba(0, 0, 0, 0.6);
  border-radius: var(--radius);
  overflow: hidden;
}

#preview-frame {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* Corner resize handle */
#preview-resize-handle {
  display: none;
  position: absolute;
  right: 0;
  bottom: 0;
  width: 18px;
  height: 18px;
  cursor: se-resize;
  z-index: 10;
}
#preview-iframe-wrapper.framed #preview-resize-handle {
  display: block;
}
#preview-resize-handle::after {
  content: "";
  position: absolute;
  right: 3px;
  bottom: 3px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 0 10px 10px;
  border-color: transparent transparent rgba(255, 255, 255, 0.25) transparent;
  transition: border-color 0.1s;
}
#preview-resize-handle:hover::after {
  border-color: transparent transparent rgba(255, 255, 255, 0.55) transparent;
}

#sidebar {
  flex: 0 0 40%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-sidebar);
  border-left: 1px solid var(--border);
  min-width: 300px;
}

/* Tabs */
#tabs {
  display: flex;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  background: var(--bg-root);
}

.tab-button {
  flex: 1;
  padding: 10px 8px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition:
    color 0.15s,
    border-color 0.15s;
}
.tab-button:hover {
  color: var(--text);
}
.tab-button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

#tab-content {
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* Tab panels with sticky footer */
.tab-panel {
  display: none;
  position: absolute;
  inset: 0;
  flex-direction: column;
}
.tab-panel.active {
  display: flex;
}

.tab-scroll-area {
  flex: 1;
  overflow-y: auto;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
}

.tab-footer {
  flex-shrink: 0;
  padding: 8px 10px;
  border-top: 1px solid var(--border);
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.placeholder-text {
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
  padding: 32px 16px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Buttons */
button {
  font-family: var(--font);
  cursor: pointer;
  border: none;
}

.button-icon {
  background: transparent;
  color: var(--text-muted);
  padding: 2px 5px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  line-height: 1;
  transition:
    color 0.1s,
    background 0.1s;
}
.button-icon:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
}
.button-icon.button-danger:hover {
  color: var(--danger);
  background: rgba(224, 82, 82, 0.12);
}

.button-primary {
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius);
  transition: opacity 0.1s;
}
.button-primary:hover {
  opacity: 0.85;
}
.button-primary:disabled {
  opacity: 0.1;
  cursor: not-allowed;
}

.button-secondary {
  background: var(--bg-card-2);
  color: var(--text);
  font-size: 11px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: opacity 0.1s;
}
.button-secondary:hover {
  opacity: 0.8;
}

.button-success {
  background: #2d8a52;
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius);
  transition: opacity 0.1s;
}
.button-success:hover {
  opacity: 0.85;
}

.button-success-dim {
  background: #1c5c36;
  color: #9ecfb3;
  font-size: 11px;
  font-weight: 600;
  padding: 7px 12px;
  border-radius: var(--radius);
  transition: opacity 0.1s;
}
.button-success-dim:hover {
  opacity: 0.85;
}
.button-full {
  width: 100%;
  flex-shrink: 0;
}

/* Button row (side-by-side) */
.button-row {
  display: flex;
  gap: 6px;
}
.button-row .button-primary,
.button-row .button-secondary,
.button-row .button-success,
.button-row .button-success-dim {
  flex: 1;
}

/* Inputs & Selects */
.param-select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 11px;
  padding: 4px 6px;
  cursor: pointer;
  font-family: var(--font);
}
.param-select:focus {
  outline: none;
  border-color: var(--accent);
}

/* Assets tab */
#assets-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.asset-card {
  display: grid;
  grid-template-columns: 44px 1fr 24px;
  align-items: center;
  gap: 6px;
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 6px;
}

.asset-card-thumb {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.3);
  cursor: pointer;
  transition: opacity 0.1s;
}
.asset-card-thumb:hover {
  opacity: 0.75;
}

.asset-card-name {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  color: var(--text);
  font-size: 11px;
  padding: 2px 0;
  outline: none;
  min-width: 0;
  font-family: var(--font);
}
.asset-card-name:focus {
  border-bottom-color: var(--accent);
  color: #fff;
}
.asset-card-name[readonly] {
  cursor: default;
  pointer-events: none;
  color: var(--text-muted);
}

.asset-card-delete {
  align-self: center;
}

/* Layer tab */
#layers-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.layer-card {
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.layer-card-active {
  border-color: var(--accent);
}

.layer-card-header {
  display: flex;
  align-items: flex-start;
  gap: 6px;
}

.layer-activate-btn {
  width: 14px;
  height: 14px;
  min-width: 14px;
  border-radius: 50%;
  background: transparent;
  border: 2px solid var(--text-muted);
  padding: 0;
  cursor: pointer;
  margin-top: 2px;
  transition: border-color 0.1s, background 0.1s;
}

.layer-activate-btn.is-active {
  background: var(--accent);
  border-color: var(--accent);
  cursor: default;
}

.layer-activate-btn:not(.is-active):hover {
  border-color: var(--text);
}

.layer-card-fields {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.layer-card-header > .button-icon {
  margin-left: auto;
}

.layer-field-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  align-items: center;
  gap: 6px;
}

.layer-policy-params {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

/* Add layer form in footer */
#add-layer-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Elements tab */
#elements-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.element-card {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 8px;
  cursor: default;
}

.element-card.drag-ghost {
  opacity: 0.4;
}

.element-card.drag-over {
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.06);
}

.element-card-header {
  display: flex;
  align-items: center;
  gap: 5px;
}

.drag-handle {
  color: var(--text-muted);
  font-size: 13px;
  cursor: grab;
  line-height: 1;
  padding: 1px 2px;
  user-select: none;
  flex-shrink: 0;
}
.drag-handle:active {
  cursor: grabbing;
}

.element-card-type {
  color: var(--accent);
  font-size: 11px;
  font-weight: 600;
  flex: 1;
}

.element-card-name {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 11px;
  padding: 3px 6px;
  outline: none;
  font-family: var(--font);
}
.element-card-name:focus {
  border-color: var(--accent);
}

/* Inline texture picker row */
.element-texture-row {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 2px 0;
  border-radius: var(--radius-sm);
  transition: background 0.1s;
}
.element-texture-row:hover {
  background: rgba(255, 255, 255, 0.05);
}

.element-texture-thumb {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
}

.element-texture-name {
  color: var(--text-muted);
  font-size: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

/* Constraints tab */
#constraints-list {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.constraint-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 8px;
}

.constraint-card.drag-ghost {
  opacity: 0.4;
}

.constraint-card.drag-over {
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.06);
}

.constraint-card-header {
  display: flex;
  align-items: center;
  gap: 5px;
}

.constraint-card-header .element-card-info {
  flex: 1;
}

.constraint-fields {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 4px;
  border-top: 1px solid var(--border);
}

.constraint-field-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  align-items: center;
  gap: 6px;
}

/* Paired H/V constraint row */
.constraint-paired-row {
  display: grid;
  grid-template-columns: 100px 1fr 1fr;
  align-items: center;
  gap: 4px;
}

.constraint-paired-cell {
  display: flex;
  align-items: center;
  gap: 3px;
}

.paired-role-label {
  color: var(--text-muted);
  font-size: 10px;
  font-family: var(--font-mono);
  flex-shrink: 0;
  width: 14px;
}

/* Slider + number combo */
.param-slider {
  flex: 1;
  min-width: 0;
  accent-color: var(--accent);
  height: 3px;
  cursor: pointer;
}

.param-input-narrow {
  width: 46px;
  flex-shrink: 0;
  text-align: right;
}

/* Add element/constraint forms in footer */
#add-element-row,
#add-constraint-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Dynamic fields rendered per element type */
#add-element-fields {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.add-field-row {
  display: grid;
  grid-template-columns: 15% 1fr;
  align-items: center;
  gap: 6px;
}

/* Paired add-form rows */
.add-paired-row {
  display: grid;
  grid-template-columns: 15% 1fr 1fr;
  align-items: center;
  gap: 4px;
}

.add-field-label {
  color: var(--text-label);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.param-input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 11px;
  padding: 4px 6px;
  font-family: var(--font-mono);
}
.param-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* Element card info */
.element-card-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.element-card-asset {
  color: var(--text-muted);
  font-size: 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Export tab */
#export-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.export-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 4px 0;
}

/* Drag states for layer cards */
.layer-card.drag-ghost {
  opacity: 0.4;
}

.layer-card.drag-over {
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.06);
}

/* ─── Picker button widget (texture & element selectors in forms) ─────────── */

.picker-btn {
  display: flex;
  align-items: center;
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px 6px;
  min-height: 28px;
  cursor: pointer;
  transition: border-color 0.1s;
  overflow: hidden;
}
.picker-btn:hover {
  border-color: rgba(255, 255, 255, 0.22);
}

.picker-btn-display {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  flex: 1;
}

.picker-btn-thumb {
  width: 20px;
  height: 20px;
  object-fit: contain;
  border-radius: 2px;
  background: rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
}

.picker-btn-thumb-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card-2);
  color: var(--text-muted);
  font-size: 11px;
}

.picker-btn-name {
  color: var(--text);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.picker-btn-placeholder {
  color: var(--text-muted);
  font-size: 11px;
}

/* ─── Element picker modal ───────────────────────────────────────────────── */

#element-picker-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ep-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.ep-popup {
  position: relative;
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 320px;
  max-height: 400px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.7);
}

.ep-header {
  display: flex;
  gap: 6px;
  padding: 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.ep-search {
  flex: 1;
}

.ep-list {
  overflow-y: auto;
  padding: 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.ep-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition:
    background 0.1s,
    border-color 0.1s;
}
.ep-item:hover {
  background: rgba(255, 255, 255, 0.06);
}
.ep-item.ep-item-selected {
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.08);
}

.ep-item-thumb {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.3);
  flex-shrink: 0;
}

.ep-item-thumb-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card-2);
  color: var(--text-muted);
  font-size: 16px;
}

.ep-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.ep-item-name {
  color: var(--text);
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ep-item-type {
  color: var(--accent);
  font-size: 10px;
}

/* Texture picker modal */
#texture-picker-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tp-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.tp-popup {
  position: relative;
  background: var(--bg-card-0);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 360px;
  max-height: 480px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.7);
}

.tp-header {
  display: flex;
  gap: 6px;
  padding: 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.tp-search {
  flex: 1;
}

.tp-grid {
  overflow-y: auto;
  padding: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 6px;
}

.tp-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.1s, border-color 0.1s;
}

.tp-item:hover {
  background: rgba(255, 255, 255, 0.06);
}

.tp-item.tp-item-selected {
  border-color: var(--accent);
  background: rgba(77, 159, 255, 0.08);
}

.tp-item img {
  width: 56px;
  height: 56px;
  object-fit: contain;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.3);
}

.tp-item span {
  font-size: 9px;
  color: var(--text-muted);
  text-align: center;
  word-break: break-all;
  line-height: 1.3;
  max-width: 64px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}