:root {
  color-scheme: light dark;
  --bg: #f4f3ef;
  --panel: #ffffff;
  --panel-2: #f0efea;
  --border: #dddbd3;
  --text: #1b1c1e;
  --muted: #6a6d73;
  --accent: #17804a;
  --accent-contrast: #ffffff;
  --focus: #17804a;
  --shadow: 0 1px 2px rgb(0 0 0 / 0.06), 0 4px 16px rgb(0 0 0 / 0.04);

  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "DejaVu Sans Mono", "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1012;
    --panel: #17191c;
    --panel-2: #1e2125;
    --border: #2b2f35;
    --text: #e7e8ea;
    --muted: #8d939b;
    --accent: #5fe08f;
    --accent-contrast: #07210f;
    --focus: #5fe08f;
    --shadow: none;
  }
}

*, *::before, *::after { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 var(--sans);
  accent-color: var(--accent);
  display: flex;
  flex-direction: column;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- Header ---------- */

.site-header {
  padding: 18px 24px 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 16px;
  border-bottom: 1px solid var(--border);
}

.site-header h1 {
  margin: 0;
  font: 700 18px/1.2 var(--mono);
  letter-spacing: -0.01em;
}

.logo { color: var(--accent); }

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

/* ---------- Layout ---------- */

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
}

.panel {
  border-right: 1px solid var(--border);
  padding: 8px 20px 24px;
  overflow-y: auto;
}

.output {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

@media (max-width: 860px) {
  body { height: auto; }
  .layout { grid-template-columns: minmax(0, 1fr); }
  .panel { border-right: 0; border-bottom: 1px solid var(--border); overflow: visible; padding: 8px 16px 20px; }
  .output { min-height: 70vh; }
  .site-header { padding: 14px 16px 12px; }
}

/* ---------- Controls ---------- */

.group {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.group h2 {
  margin: 0 0 10px;
  font: 600 11px/1 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}

.field-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.field .val {
  font: 12px var(--mono);
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.hint {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
}

.range-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.range-row input[type="range"] { flex: 1; min-width: 0; }

input[type="range"] { width: 100%; margin: 0; }

input[type="number"],
input[type="text"],
select {
  font: inherit;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 6px 8px;
}

input[type="number"] { width: 68px; font-family: var(--mono); font-size: 13px; }
input[type="text"] { font-family: var(--mono); width: 100%; }
select { width: 100%; }

.ramp {
  display: block;
  padding: 6px 8px;
  border-radius: 7px;
  background: var(--panel-2);
  font: 13px/1.3 var(--mono);
  white-space: pre;
  overflow-x: auto;
  color: var(--muted);
}

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  cursor: pointer;
  user-select: none;
}

.check input { margin: 0; width: 16px; height: 16px; }

.segmented {
  border: 0;
  padding: 0;
  margin: 0 0 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.segmented legend {
  padding: 0;
  margin-bottom: 6px;
}

.segmented label { position: relative; }

.segmented input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.segmented span {
  display: block;
  text-align: center;
  padding: 6px 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  cursor: pointer;
}

.segmented label:first-of-type span { border-radius: 7px 0 0 7px; }
.segmented label:last-of-type span { border-radius: 0 7px 7px 0; border-left: 0; }

.segmented input:checked + span {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.segmented input:focus-visible + span {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- Drop zone ---------- */

.drop {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 84px;
  padding: 12px;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}

.drop:hover,
.drop:has(+ #file:focus-visible) {
  border-color: var(--accent);
}

.drop:has(+ #file:focus-visible) {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.drop img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 6px;
  flex: none;
  background: var(--panel-2);
}

.drop-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  font-size: 13px;
}

.drop-text span {
  color: var(--muted);
  overflow-wrap: anywhere;
}

kbd {
  font: 11px var(--mono);
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--panel-2);
}

.btn-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.btn-row .btn { flex: 1; }

/* ---------- Buttons ---------- */

.btn {
  font: 500 13px/1 var(--sans);
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 8px 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s, background-color 0.15s;
}

.btn:hover:not(:disabled) { border-color: var(--accent); }

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.btn-primary:hover:not(:disabled) { filter: brightness(1.08); }

.btn-ghost {
  margin-top: 14px;
  width: 100%;
  background: transparent;
  color: var(--muted);
}

/* ---------- Output ---------- */

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

.zoom {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.zoom input[type="range"] { width: 110px; }

.stats {
  font: 12px var(--mono);
  color: var(--muted);
  white-space: nowrap;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.divider {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}

.stage {
  --art-bg: #0c0d0f;
  --art-fg: #e9e9e6;
  flex: 1;
  min-height: 0;
  overflow: auto;
  background: var(--art-bg);
  color: var(--art-fg);
  position: relative;
}

.art {
  margin: 0;
  padding: 16px;
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.2;
  white-space: pre;
  letter-spacing: 0;
  font-kerning: none;
  font-variant-ligatures: none;
  width: max-content;
  min-width: 100%;
}

.empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  text-align: center;
  color: var(--art-fg);
}

.empty p { margin: 0; opacity: 0.75; max-width: 34ch; }

.empty-art {
  margin: 0;
  font: 14px/1.2 var(--mono);
  opacity: 0.55;
  text-align: left;
}

/* ---------- Toast & drag overlay ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  translate: -50% 12px;
  opacity: 0;
  pointer-events: none;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  font-weight: 500;
  box-shadow: 0 6px 24px rgb(0 0 0 / 0.25);
  transition: opacity 0.2s, translate 0.2s;
  max-width: calc(100vw - 32px);
}

.toast.show {
  opacity: 1;
  translate: -50% 0;
}

.drop-overlay {
  position: fixed;
  inset: 0;
  display: none;
  place-items: center;
  background: rgb(0 0 0 / 0.55);
  z-index: 10;
  pointer-events: none;
}

.drop-overlay span {
  padding: 28px 40px;
  border: 2px dashed var(--accent);
  border-radius: 16px;
  background: var(--panel);
  font: 600 16px var(--mono);
}

body.dragging .drop-overlay { display: grid; }

@media (prefers-reduced-motion: reduce) {
  .toast, .drop, .btn { transition: none; }
}