:root {
  color-scheme: dark;
  --bg: #0b1110;
  --panel: #111a18;
  --panel-2: #17221f;
  --line: #31423d;
  --text: #f1eee2;
  --muted: #a9b5ae;
  --accent: #d4a84e;
  --accent-bright: #f0c868;
  --green: #79a58d;
  --shadow: 0 18px 45px rgba(0, 0, 0, .32);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0;
  min-width: 940px;
  min-height: 100vh;
  background:
    radial-gradient(circle at 80% 0%, rgba(78, 113, 98, .15), transparent 30%),
    var(--bg);
  color: var(--text);
  font: 15px/1.45 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input, select { font: inherit; }

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 32px;
  padding: 25px 34px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(14, 22, 20, .9);
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent-bright);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 3px; font-family: Georgia, serif; font-size: 29px; }
h2 { margin-bottom: 14px; color: #f5e7bd; font-size: 14px; text-transform: uppercase; letter-spacing: .06em; }
.subtitle { margin-bottom: 0; color: var(--muted); }

.privacy-badge {
  padding: 10px 14px;
  border: 1px solid #486356;
  border-radius: 8px;
  color: #cfe4d6;
  background: #16251f;
  text-align: right;
  font-size: 12px;
  font-weight: 700;
}

.privacy-badge span { color: #9eb5a8; font-weight: 400; }

.workspace {
  display: grid;
  grid-template-columns: 330px minmax(600px, 1fr);
  min-height: calc(100vh - 151px);
}

.control-panel {
  padding: 22px;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: #0e1714;
}

.panel-section {
  padding: 18px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
}

.upload-zone {
  display: grid;
  place-items: center;
  min-height: 122px;
  padding: 15px;
  border: 1px dashed #688075;
  border-radius: 8px;
  color: var(--muted);
  background: #0c1412;
  text-align: center;
  cursor: pointer;
  transition: .16s ease;
}

.upload-zone:hover, .upload-zone.dragging {
  border-color: var(--accent-bright);
  background: #18201a;
  transform: translateY(-1px);
}

.upload-zone input { display: none; }
.upload-zone strong { color: var(--text); }
.upload-icon { color: var(--accent-bright); font-size: 29px; line-height: 1; }
.file-meta { margin-top: 9px; color: var(--muted); font-size: 12px; }

.field { display: grid; gap: 7px; margin: 15px 0; }
.field > span { display: flex; justify-content: space-between; color: #ddd8c9; }
.field small { color: #84958d; font-size: 11px; }
.field.compact { grid-template-columns: 1fr 44px; align-items: center; }

select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #40534b;
  border-radius: 5px;
  color: var(--text);
  background: #0d1513;
}

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

input[type="color"] {
  width: 44px;
  height: 32px;
  padding: 2px;
  border: 1px solid #53685f;
  border-radius: 4px;
  background: transparent;
}

output { color: var(--accent-bright); font-variant-numeric: tabular-nums; }

.check-row {
  display: flex;
  gap: 9px;
  align-items: center;
  margin: 12px 0;
  color: #d9d7cc;
}

.check-row input { accent-color: var(--accent); }

button {
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  transition: .15s ease;
}

button:disabled { opacity: .42; cursor: not-allowed; }

.primary-button, .download-button {
  width: 100%;
  padding: 11px 14px;
  margin-top: 8px;
  color: #18150d;
  background: linear-gradient(#f0c868, #c99b3f);
  font-weight: 800;
}

.primary-button:not(:disabled):hover, .download-button:not(:disabled):hover {
  filter: brightness(1.09);
  transform: translateY(-1px);
}

.download-button { background: linear-gradient(#9bc3aa, #6e9b81); }
.trace-stats { color: var(--muted); font-size: 12px; }

.preview-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 22px;
  background: #090e0d;
}

.preview-toolbar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 14px;
}

.segmented-control {
  display: flex;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #111916;
}

.segmented-control button, .subtle-button {
  padding: 7px 12px;
  color: var(--muted);
  background: transparent;
}

.segmented-control button.active {
  color: #19160f;
  background: var(--accent);
  font-weight: 800;
}

.subtle-button {
  border: 1px solid var(--line);
  background: #111916;
}

.subtle-button:hover { color: var(--text); border-color: #5d7469; }

.color-quick-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: -4px 0 6px;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 7px;
}

.zoom-controls .subtle-button {
  min-width: 38px;
  padding-inline: 10px;
}

#zoomReadout {
  min-width: 56px;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: #f3e7c3;
  background: #111916;
  text-align: center;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.preview-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  flex: 1;
  min-height: 580px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background-color: #d7d7d7;
  background-image:
    linear-gradient(45deg, #bcbcbc 25%, transparent 25%),
    linear-gradient(-45deg, #bcbcbc 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #bcbcbc 75%),
    linear-gradient(-45deg, transparent 75%, #bcbcbc 75%);
  background-position: 0 0, 0 10px, 10px -10px, -10px 0;
  background-size: 20px 20px;
  box-shadow: var(--shadow);
}

.preview-cell {
  position: relative;
  display: grid;
  place-items: center;
  min-width: 0;
  min-height: 0;
  overflow: auto;
  padding: 35px 18px 18px;
}

.preview-cell + .preview-cell { border-left: 1px solid rgba(34, 45, 41, .5); }

.preview-zoom-inner {
  display: inline-grid;
  place-items: center;
  min-width: max-content;
  min-height: max-content;
}

.preview-label {
  position: absolute;
  z-index: 3;
  top: 8px;
  left: 10px;
  padding: 4px 8px;
  border-radius: 4px;
  color: #e9e6db;
  background: rgba(10, 16, 14, .83);
  font-size: 11px;
  font-weight: 700;
}

canvas, .svg-preview {
  display: block;
  object-fit: contain;
}

.svg-preview svg { display: block; width: 100%; height: 100%; }
.empty-state { max-width: 250px; color: #58615d; text-align: center; }

.preview-stage:not(.split-view) { grid-template-columns: 1fr; }
.preview-stage:not(.split-view) .preview-cell { display: none; }
.preview-stage.original-view .original-cell,
.preview-stage.contrast-view .result-cell,
.preview-stage.vector-view .result-cell { display: grid; }
.preview-stage:not(.split-view) .preview-cell + .preview-cell { border-left: 0; }

footer {
  display: flex;
  justify-content: space-between;
  padding: 12px 34px;
  border-top: 1px solid var(--line);
  color: #7f9188;
  background: #0d1412;
  font-size: 11px;
}

@media (max-width: 1050px) {
  body { min-width: 760px; }
  .workspace { grid-template-columns: 290px minmax(470px, 1fr); }
  .control-panel { padding: 14px; }
}