:root {
  --bg: #0c0f1f;
  --panel: #171c34;
  --panel-2: #1e2442;
  --text: #eef2ff;
  --muted: #99a1c7;
  --accent: #49d1ff;
  --accent-2: #9eff6f;
  --danger: #ff6b8a;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 15%, #1c275d 0%, transparent 45%),
    radial-gradient(circle at 85% 10%, #2b1455 0%, transparent 38%),
    linear-gradient(170deg, #0b0e1f 0%, #060812 60%);
}

.app-shell {
  padding: 18px;
  max-width: 1700px;
  margin: 0 auto;
  transition: max-width 0.25s ease;
}

.app-shell.app-shell--sheet-focus {
  max-width: 100%;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
  align-items: center;
}

h1, h2 {
  margin: 0;
}

h1 {
  font-family: "Bebas Neue", sans-serif;
  letter-spacing: 0.03em;
  font-size: 2.3rem;
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.menu-dropdown {
  position: relative;
}

.menu-dropdown-trigger[aria-expanded="true"] {
  border-color: rgba(73, 209, 255, 0.45);
  background: rgba(73, 209, 255, 0.12);
}

.menu-dropdown-trigger .menu-chevron {
  display: inline-block;
  margin-left: 4px;
  font-size: 0.75em;
  opacity: 0.85;
}

.menu-dropdown-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 200;
  min-width: min(280px, calc(100vw - 36px));
  max-height: min(70vh, 520px);
  overflow-y: auto;
  padding: 8px 0;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #1a1f38, #141a30);
  box-shadow: var(--shadow);
}

.menu-dropdown-panel[hidden] {
  display: none !important;
}

.menu-section {
  padding: 4px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.menu-section:last-child {
  border-bottom: none;
}

.menu-section-label {
  display: block;
  padding: 6px 14px 4px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.menu-item {
  display: block;
  width: 100%;
  margin: 0;
  padding: 9px 14px;
  border: none;
  border-radius: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.88rem;
  text-align: left;
  cursor: pointer;
  transition: background 0.12s ease;
}

.menu-item:hover,
.menu-item:focus-visible {
  background: rgba(73, 209, 255, 0.12);
  outline: none;
}

.menu-item-danger:hover,
.menu-item-danger:focus-visible {
  background: rgba(255, 107, 138, 0.15);
}

.menu-item[hidden] {
  display: none !important;
}

.panel-restore-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.22);
}

.panel-restore-bar[hidden] {
  display: none !important;
}

.panel-restore-bar-label {
  font-size: 0.82rem;
  color: var(--muted);
  margin-right: 4px;
}

.layout {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: 14px;
  transition: gap 0.2s ease;
}

.layout > .panel {
  flex: 1 1 0;
  min-width: 0;
}

.source-panel {
  flex: 1.5 1 0;
}

.library-panel {
  flex: 1 1 0;
}

.sheet-panel {
  flex: 1.6 1 0;
}

.panel.panel--collapsed {
  display: none !important;
}

.sheet-panel.sheet-panel--anim-hidden .animator-panel {
  display: none;
}

.sheet-panel.sheet-panel--anim-hidden .sheet-stage-wrap {
  max-height: min(88vh, 960px);
}

.layout.layout--sheet-focus .source-panel,
.layout.layout--sheet-focus .library-panel {
  display: none !important;
}

.layout.layout--sheet-focus .sheet-panel {
  flex: 1 1 auto;
  width: 100%;
  min-width: 0;
}

.panel {
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 14px;
  min-height: 300px;
}

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

.panel-header h2 {
  flex: 0 1 auto;
  min-width: 0;
}

.panel-header-tools {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
  margin-left: auto;
  max-width: 100%;
}

.panel-header-tools .panel-menu.menu-dropdown {
  z-index: 50;
}

.animator-panel .panel-header-tools .hint {
  max-width: 14rem;
}

.hint {
  color: var(--muted);
  font-size: 0.86rem;
}

.drop-zone {
  border: 2px dashed var(--line);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  color: var(--muted);
  cursor: pointer;
  transition: 0.2s ease;
}

.drop-zone strong {
  color: var(--text);
}

.drop-zone.drag-over {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 2px rgba(73, 209, 255, 0.3);
  color: var(--accent);
}

.image-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 10px 0;
}

.image-tab {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 10px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
  font-size: 0.84rem;
}

.image-tab.active {
  border-color: var(--accent);
  color: var(--accent);
}

.selection-mode-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.bg-remove-panel {
  margin: 10px 0;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.2);
}

.bg-remove-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.bg-color-swatch {
  display: inline-block;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 2px solid var(--line);
  background: repeating-conic-gradient(#333 0% 25%, #555 0% 50%) 50% / 12px 12px;
  vertical-align: middle;
}

.bg-color-swatch.has-color {
  border-color: var(--accent);
}

.bg-remove-sliders {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.bg-remove-sliders label {
  display: grid;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--muted);
}

.bg-remove-pro {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 8px;
  align-items: center;
}

.tiny-hint {
  margin: 6px 0 0;
  font-size: 0.78rem;
}

.pixel-nudge-row {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.pixel-align-readout {
  width: 100%;
  margin: 4px 0 0;
  line-height: 1.35;
}

.nudge-arrows {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.nudge-mid {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nudge-btn {
  min-width: 36px;
}

.source-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  gap: 10px;
}

.source-controls label {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.source-controls input[type="range"] {
  width: 100%;
}

.source-viewport {
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: auto;
  max-height: 370px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(-45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%) 0 0 / 18px 18px,
    #0c1021;
}

#sourceCanvas {
  display: block;
  touch-action: none;
}

.selection-toolbar {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr auto auto;
  gap: 8px;
  align-items: center;
}

.toggle-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.88rem;
  white-space: nowrap;
}

.toggle-inline input[type="checkbox"] {
  width: 16px;
  height: 16px;
  margin: 0;
}

#selectionReadout {
  font-size: 0.85rem;
  color: var(--muted);
}

input, select, button {
  font: inherit;
}

input, select {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.2);
  color: var(--text);
  padding: 8px 10px;
}

.btn {
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 8px 11px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn.primary {
  background: linear-gradient(120deg, var(--accent), #5f7fff);
  color: #001321;
  font-weight: 700;
}

.btn.ghost {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.btn.tiny {
  padding: 6px 9px;
  font-size: 0.82rem;
}

.import-sheet-panel {
  margin-bottom: 14px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.18);
}

.import-sheet-file {
  display: grid;
  gap: 6px;
  margin: 10px 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.import-sheet-file input[type="file"] {
  width: 100%;
  font-size: 0.8rem;
}

.import-sheet-label {
  margin: 12px 0 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.import-sheet-sizing-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 4px;
}

.import-sheet-option {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 2px;
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.2);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.import-sheet-option:has(:checked) {
  border-color: rgba(73, 209, 255, 0.55);
  background: rgba(73, 209, 255, 0.1);
}

.import-sheet-option:focus-within {
  outline: 2px solid rgba(73, 209, 255, 0.45);
  outline-offset: 2px;
}

.import-sheet-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.import-sheet-option-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}

.import-sheet-option-desc {
  font-size: 0.75rem;
  line-height: 1.3;
  color: var(--muted);
}

.import-sheet-block {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.12);
}

.import-sheet-block--muted {
  background: rgba(0, 0, 0, 0.08);
}

.import-sheet-block[hidden] {
  display: none !important;
}

.import-sheet-block-title {
  margin: 0 0 8px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text);
}

.import-sheet-block-hint {
  margin: -4px 0 10px;
  font-size: 0.74rem;
  line-height: 1.35;
  color: var(--muted);
}

.import-sheet-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 0;
}

.import-sheet-grid--pair {
  grid-template-columns: repeat(2, 1fr);
}

.import-sheet-grid--quad {
  grid-template-columns: repeat(2, 1fr);
}

.import-sheet-grid label {
  display: grid;
  gap: 4px;
  font-size: 0.78rem;
  color: var(--muted);
}

.import-sheet-name-field {
  display: grid;
  gap: 6px;
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.import-sheet-options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 10px 0 0;
}

.import-sheet-readout {
  margin: 8px 0 0;
}

.sprite-library {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  max-height: 720px;
  overflow: auto;
}

.sprite-library.empty {
  display: grid;
  place-items: center;
  border: 1px dashed var(--line);
  border-radius: 12px;
  color: var(--muted);
  min-height: 150px;
}

.sprite-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px;
  background: rgba(0, 0, 0, 0.2);
  cursor: grab;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sprite-delete {
  width: 100%;
  margin-top: 2px;
  border-color: rgba(255, 107, 138, 0.45);
  color: var(--danger);
}

.sprite-delete:hover {
  background: rgba(255, 107, 138, 0.15);
}

.subheading {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0;
  color: var(--text);
}

.cell-appearance-panel {
  margin-top: 12px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.18);
}

.cell-appearance-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 8px;
}

.cell-appearance-grid label {
  display: grid;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--muted);
}

.cell-appearance-grid input[type="range"] {
  width: 100%;
}

.cell-fx-readout {
  margin: 8px 0 0;
  font-size: 0.8rem;
}

.cell-appearance-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.cell-flip-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.cell-flip-row .hint {
  margin: 0;
  margin-right: 4px;
  font-size: 0.78rem;
}

.sprite-card:active {
  cursor: grabbing;
}

.sprite-preview-wrap {
  display: grid;
  place-items: center;
  min-height: 88px;
  border-radius: 8px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%) 0 0 / 16px 16px,
    linear-gradient(-45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%) 0 0 / 16px 16px,
    #0d1227;
}

.sprite-card canvas {
  max-width: 100%;
  image-rendering: pixelated;
}

.sprite-meta {
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--muted);
  display: grid;
  gap: 2px;
}

.sheet-config {
  display: grid;
  grid-template-columns: 1.8fr repeat(6, minmax(64px, 1fr)) auto;
  gap: 8px;
  align-items: end;
}

.sheet-tools-hint {
  margin: 8px 0 0;
  line-height: 1.35;
}

.sheet-tools-hint strong {
  font-weight: 700;
  color: var(--accent);
}

.cell-jump {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  align-items: end;
  max-width: 14rem;
}

.btn.active {
  background: linear-gradient(120deg, var(--accent-2), #49d1ff);
  color: #042111;
  border-color: transparent;
  font-weight: 700;
}

.sheet-stage-wrap {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: auto;
  max-height: 620px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(-45deg, rgba(255, 255, 255, 0.05) 25%, transparent 25%) 0 0 / 18px 18px,
    #0c1021;
}

#sheetCanvas {
  display: block;
  margin: 0;
}

.sheet-tip {
  color: var(--muted);
  margin-bottom: 0;
  font-size: 0.87rem;
}

.animator-panel {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.animator-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.animator-main {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 10px;
}

.animator-preview {
  display: grid;
  gap: 8px;
}

#animPreviewCanvas {
  width: 220px;
  height: 220px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background:
    linear-gradient(45deg, rgba(255, 255, 255, 0.06) 25%, transparent 25%) 0 0 / 18px 18px,
    linear-gradient(-45deg, rgba(255, 255, 255, 0.06) 25%, transparent 25%) 0 0 / 18px 18px,
    #0c1021;
}

.animator-list-wrap {
  border: 1px solid var(--line);
  border-radius: 10px;
  min-height: 220px;
  max-height: 260px;
  overflow: auto;
  background: rgba(0, 0, 0, 0.18);
}

.anim-frame-list {
  display: grid;
  gap: 6px;
  padding: 8px;
}

.anim-frame-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 9px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.03);
}

.anim-frame-item.active {
  border-color: var(--accent);
  background: rgba(73, 209, 255, 0.15);
}

.animator-speed {
  margin-top: 10px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 90px minmax(7rem, auto) auto;
  gap: 8px;
  align-items: end;
}

.anim-stride-label select {
  width: 100%;
  max-width: 11rem;
}

@media (max-width: 1400px) {
  .layout {
    flex-direction: column;
  }

  .layout > .panel {
    flex: 1 1 auto;
    width: 100%;
  }

  .source-panel,
  .library-panel,
  .sheet-panel {
    flex: 1 1 auto;
  }

  .sheet-config {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }

  .selection-toolbar {
    grid-template-columns: 1fr;
  }

  .cell-jump {
    max-width: none;
  }

  .animator-main {
    grid-template-columns: 1fr;
  }

  #animPreviewCanvas {
    width: 100%;
    height: auto;
    max-width: 320px;
    aspect-ratio: 1 / 1;
  }

  .animator-speed {
    grid-template-columns: 1fr;
  }

  .cell-appearance-grid {
    grid-template-columns: 1fr;
  }

  .import-sheet-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}