:root {
  color-scheme: light;
  --ink: #171717;
  --muted: #6b6f76;
  --line: #dfe3e8;
  --surface: #f7f9f8;
  --panel: #ffffff;
  --accent: #0f7b63;
  --accent-dark: #075b49;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100svh;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  color: var(--ink);
  background: var(--surface);
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  min-height: 100svh;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: center;
  padding: 36px 0;
}

.workspace {
  display: grid;
  gap: 28px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  max-width: 10ch;
  margin: 0;
  font-size: clamp(3rem, 8vw, 6.6rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.copy {
  max-width: 520px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.6;
}

.controls {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: stretch;
}

.parameters {
  display: grid;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.parameter-row {
  display: grid;
  grid-template-columns: 130px minmax(120px, 1fr) 52px;
  gap: 12px;
  align-items: center;
}

.parameter-row label,
.toggle-row {
  color: #3e454b;
  font-size: 0.9rem;
  font-weight: 700;
}

.parameter-row output {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

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

.parameter-row select {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

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

.toggle-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.drop-zone {
  min-height: 72px;
  display: grid;
  align-content: center;
  gap: 4px;
  padding: 16px 18px;
  border: 1px dashed #9ba7a4;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.68);
  cursor: pointer;
  transition:
    border-color 160ms ease,
    background 160ms ease;
}

.drop-zone:hover {
  border-color: var(--accent);
  background: #fff;
}

.drop-zone input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-zone span {
  font-weight: 800;
}

.drop-zone small,
.status {
  color: var(--muted);
}

button,
.download-link {
  min-height: 52px;
  border: 0;
  border-radius: 8px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--accent);
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition:
    background 160ms ease,
    transform 160ms ease,
    opacity 160ms ease;
}

button:hover,
.download-link:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
  transform: none;
}

.status-box {
  min-height: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.status {
  margin: 0;
}

.spinner {
  width: 18px;
  height: 18px;
  display: none;
  flex: 0 0 auto;
  border: 2px solid #cfd8d5;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 800ms linear infinite;
}

.status-box.is-loading .spinner {
  display: inline-block;
}

.status-box.is-loading .status {
  color: var(--accent-dark);
  font-weight: 700;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.preview-panel {
  min-width: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

figcaption {
  color: #3e454b;
  font-size: 0.84rem;
  font-weight: 800;
}

.image-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.checkerboard {
  background-image:
    linear-gradient(45deg, #dfe4e3 25%, transparent 25%),
    linear-gradient(-45deg, #dfe4e3 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #dfe4e3 75%),
    linear-gradient(-45deg, transparent 75%, #dfe4e3 75%);
  background-position:
    0 0,
    0 10px,
    10px -10px,
    -10px 0;
  background-size: 20px 20px;
}

.image-stage img,
.image-stage canvas {
  width: 100%;
  height: 100%;
  display: none;
  object-fit: contain;
}

.image-stage.has-image img,
.image-stage.has-image canvas {
  display: block;
}

.image-stage.has-image .empty-state {
  display: none;
}

.empty-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.download-link {
  visibility: hidden;
}

.download-link.is-visible {
  visibility: visible;
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 28px;
    padding: 28px 0;
  }

  h1 {
    max-width: 11ch;
    font-size: clamp(2.8rem, 16vw, 5rem);
  }
}

@media (max-width: 620px) {
  .app-shell {
    width: min(100% - 20px, 1180px);
  }

  .controls,
  .parameter-row,
  .preview-grid {
    grid-template-columns: 1fr;
  }

  .parameter-row output {
    text-align: left;
  }
}