:root {
  color-scheme: dark;
  --bg: #0d0d0e;
  --surface: #171718;
  --surface-soft: #202023;
  --surface-raised: #26262a;
  --border: #34343a;
  --border-strong: #484850;
  --text: #f1f1f2;
  --text-soft: #bbbbc1;
  --text-faint: #85858e;
  --accent: #7657f2;
  --accent-soft: rgba(118, 87, 242, 0.14);
  --accent-border: rgba(118, 87, 242, 0.38);
  --danger: #ff7184;
  --danger-soft: rgba(255, 113, 132, 0.14);
  --checker-light: rgba(255, 255, 255, 0.055);
  --checker-dark: rgba(255, 255, 255, 0.025);
  --radius-lg: 8px;
  --radius-md: 6px;
  --radius-sm: 4px;
  font-family: "Segoe UI Variable", "Segoe UI", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
}

body {
  min-height: 100vh;
}

button,
input,
select {
  font: inherit;
}

button,
summary,
label,
input,
select {
  min-width: 0;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.65rem;
  height: 100dvh;
  overflow: hidden;
  padding: 0.75rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.4rem;
  padding: 0.65rem 0.8rem;
  background: #151516;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.brand-lockup {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.eyebrow,
.section-kicker {
  margin: 0;
  color: var(--text-faint);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.topbar h1,
.panel h2,
.preview-header h2 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0;
}

.topbar-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  background: var(--accent-soft);
  color: var(--text);
  font-size: 0.78rem;
  line-height: 1;
  padding: 0.42rem 0.55rem;
  white-space: nowrap;
}

.badge-muted {
  background: var(--surface-soft);
  border-color: var(--border);
  color: var(--text-soft);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(17rem, 0.78fr) minmax(28rem, 2.05fr) minmax(22rem, 0.54fr);
  gap: 0.65rem;
  min-height: 0;
  overflow: hidden;
}

.control-rail,
.content-column,
.library-rail {
  min-height: 0;
  overflow: hidden;
}

.control-rail {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.65rem;
}

.panel {
  min-height: 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.upload-panel,
.preview-panel,
.library-panel {
  padding: 0.75rem;
}

.panel-title-row,
.section-heading,
.preview-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.section-summary {
  margin: 0;
  color: var(--text-faint);
  font-size: 0.78rem;
  line-height: 1.3;
  text-align: right;
}

.upload-panel {
  display: grid;
  gap: 0.65rem;
}

.upload-dropzone {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  column-gap: 0.7rem;
  row-gap: 0.15rem;
  min-height: 5.5rem;
  padding: 0.7rem;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  background: #121213;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease;
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--accent-border);
  background: #18171d;
}

.upload-dropzone input {
  display: none;
}

.upload-mark {
  display: grid;
  place-items: center;
  grid-row: span 2;
  width: 2.2rem;
  height: 2.2rem;
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-md);
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 1.4rem;
  line-height: 1;
}

.upload-dropzone strong {
  overflow: hidden;
  color: var(--text);
  font-size: 0.95rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.upload-dropzone span:last-child {
  color: var(--text-faint);
  font-size: 0.78rem;
  line-height: 1.3;
}

.settings-panel {
  overflow: auto;
}

.control-group {
  border-bottom: 1px solid var(--border);
  padding: 0.65rem 0.75rem;
}

.control-group:last-child {
  border-bottom: 0;
}

.control-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
}

.control-group summary::-webkit-details-marker {
  display: none;
}

.control-group summary::after {
  content: "+";
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 1.35rem;
  height: 1.35rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  background: var(--surface-soft);
}

.control-group[open] summary::after {
  content: "-";
  color: var(--accent);
  border-color: var(--accent-border);
}

.control-group summary strong {
  display: block;
  margin-top: 0.08rem;
  font-size: 0.94rem;
}

.summary-value {
  margin-left: auto;
  color: var(--text-faint);
  font-size: 0.78rem;
  line-height: 1.2;
  text-align: right;
}

.control-group > *:not(summary) {
  margin-top: 0.65rem;
}

.split-fields,
.layer-grid,
.image-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

label {
  display: grid;
  gap: 0.28rem;
  color: var(--text-soft);
  font-size: 0.78rem;
}

input[type="number"],
select {
  width: 100%;
  min-height: 2.15rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #101011;
  color: var(--text);
  padding: 0.45rem 0.5rem;
}

input[type="number"]:focus,
select:focus,
input[type="range"]:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent-border);
  outline-offset: 2px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.range-field {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.55rem;
}

.range-field:last-child {
  margin-bottom: 0;
}

.range-labels {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.range-labels output {
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 700;
}

.helper-text,
.status-message {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.78rem;
  line-height: 1.35;
}

.status-message {
  color: var(--text);
  font-weight: 700;
}

.layer-list,
.images-list {
  display: grid;
  gap: 0.5rem;
}

.layer-card,
.image-card {
  overflow: hidden;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0.6rem;
}

.layer-header,
.image-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
  margin-bottom: 0.55rem;
}

.layer-title,
.image-title {
  min-width: 0;
}

.layer-title strong,
.image-title strong {
  display: block;
  overflow: hidden;
  color: var(--text);
  font-size: 0.86rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.layer-title span,
.image-title span,
.image-metadata {
  color: var(--text-faint);
  font-size: 0.74rem;
}

.image-metadata {
  margin: 0.12rem 0 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toggle input {
  inline-size: 1rem;
  block-size: 1rem;
  accent-color: var(--accent);
}

.layer-note {
  display: none;
}

.layer-hue-field {
  margin-top: 0.55rem;
}

.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.55rem;
}

.primary-button,
.secondary-button,
.pill-button,
.danger-button {
  min-height: 2.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 0.45rem 0.75rem;
  color: var(--text);
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, opacity 160ms ease;
}

.primary-button {
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
}

.primary-button:hover {
  background: #8368f7;
}

.secondary-button,
.pill-button {
  background: var(--surface-raised);
  border-color: var(--border);
}

.secondary-button:hover,
.pill-button:hover {
  border-color: var(--border-strong);
  background: #2e2e34;
}

.danger-button {
  background: var(--danger-soft);
  border-color: rgba(255, 113, 132, 0.34);
  color: #ffdce1;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.content-column {
  display: grid;
}

.preview-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: 0.65rem;
  height: 100%;
}

.preview-header {
  align-items: center;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.preview-surface {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 0;
  padding: 0.65rem;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%),
    var(--checker-dark);
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0;
}

#previewCanvas {
  display: none;
  max-width: 100%;
  max-height: 100%;
  background: transparent;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 100%;
  color: var(--text-faint);
  font-size: 0.85rem;
  line-height: 1.35;
  padding: 0.75rem;
  text-align: center;
}

.empty-state.compact {
  min-height: 5.5rem;
}

.preview-meta {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
}

.preview-meta .helper-text {
  max-height: 3.25rem;
  overflow: auto;
  color: var(--text-faint);
}

.library-panel {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 0.65rem;
  height: 100%;
}

.library-panel .section-heading {
  align-items: center;
}

.images-list {
  align-content: start;
  align-items: start;
  min-height: 0;
  grid-auto-rows: max-content;
  overflow: auto;
}

.images-list.empty-library {
  overflow: hidden;
}

.image-card {
  display: grid;
  grid-template-columns: 8.1rem minmax(0, 1fr);
  grid-template-areas:
    "preview header"
    "preview controls"
    "preview actions";
  gap: 0.45rem 0.55rem;
  align-self: start;
  padding: 0.45rem;
}

.image-card-header {
  grid-area: header;
  margin: 0;
}

.image-card .image-title strong {
  font-size: 0.72rem;
}

.image-card .image-metadata {
  font-size: 0.6rem;
}

.image-card .danger-button {
  min-height: 1.55rem;
  padding: 0.18rem 0.42rem;
  font-size: 0.64rem;
}

.image-preview-frame {
  grid-area: preview;
  align-self: start;
  aspect-ratio: 16 / 11;
  min-height: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background:
    linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%),
    #121213;
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
}

.source-preview {
  display: block;
  width: 100%;
  height: 100%;
}

.image-grid {
  grid-area: controls;
  grid-template-columns: repeat(auto-fit, minmax(3.35rem, 3.8rem));
  justify-content: start;
  gap: 0.28rem;
}

.image-card label {
  gap: 0.16rem;
  font-size: 0.6rem;
}

.image-grid input[type="number"] {
  min-height: 1.5rem;
  padding: 0.16rem 0.26rem;
  font-size: 0.66rem;
}

.image-card .secondary-button,
.image-card .pill-button {
  min-height: 1.58rem;
  padding: 0.2rem 0.42rem;
  font-size: 0.64rem;
}

.image-card .inline-actions {
  grid-area: actions;
  align-items: flex-start;
  gap: 0.3rem;
  margin-top: 0;
}

@media (max-width: 1180px) {
  .workspace {
    grid-template-columns: minmax(18rem, 21rem) minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) 13rem;
  }

  .library-rail {
    grid-column: 1 / -1;
  }

  .library-panel {
    grid-template-rows: auto minmax(0, 1fr);
  }
}

@media (max-width: 780px) {
  html,
  body {
    overflow: auto;
  }

  .app-shell {
    height: auto;
    min-height: 100dvh;
    overflow: visible;
    padding: 0.55rem;
  }

  .topbar,
  .brand-lockup,
  .panel-title-row,
  .section-heading,
  .preview-header,
  .preview-meta {
    display: grid;
    grid-template-columns: 1fr;
  }

  .section-summary {
    text-align: left;
  }

  .workspace {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: none;
    overflow: visible;
  }

  .control-rail,
  .content-column,
  .library-rail {
    overflow: visible;
  }

  .settings-panel,
  .images-list {
    overflow: visible;
  }

  .preview-panel {
    min-height: 30rem;
  }

  .action-row {
    justify-content: stretch;
  }

  .action-row button {
    flex: 1 1 auto;
  }

  .image-card {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "preview"
      "controls"
      "actions";
  }

  .image-preview-frame {
    min-height: 8rem;
  }
}