:root {
  --bg: #0b0b0d;
  --panel: #131317;
  --border: #26262e;
  --text: #e7e7ea;
  --muted: #8b8b96;
  --accent: #8c8cff;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 3rem 1.5rem 4rem;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

header,
main,
footer {
  width: min(1100px, 100%);
}

h1 {
  margin: 0;
  font: 600 1.6rem/1 var(--mono);
  letter-spacing: -0.02em;
}

.tagline {
  max-width: 60ch;
  margin: 0.75rem 0 1rem;
  color: var(--muted);
}

nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

nav a {
  color: var(--accent);
}

nav code {
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.5rem;
}

main {
  margin-top: 2rem;
  display: grid;
  gap: 1.5rem;
}

#stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  min-height: 320px;
}

#stage.empty {
  grid-template-columns: 1fr;
}

#stage.empty .panel {
  display: none;
}

#stage:not(.empty) #dropzone {
  display: none;
}

#dropzone {
  border: 1px dashed var(--border);
  border-radius: 10px;
  display: grid;
  place-content: center;
  text-align: center;
  padding: 3rem 1rem;
  transition: border-color 0.15s, background 0.15s;
}

#dropzone.over {
  border-color: var(--accent);
  background: #14141c;
}

.drop-title {
  margin: 0 0 0.5rem;
  font-family: var(--mono);
  font-size: 1rem;
}

.drop-hint {
  margin: 0.25rem 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.panel {
  margin: 0;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  display: grid;
  gap: 0.5rem;
  min-width: 0;
}

figcaption {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

canvas {
  width: 100%;
  height: auto;
  max-height: 62vh;
  object-fit: contain;
  border-radius: 6px;
  background: transparent;
  image-rendering: auto;
}

#controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 1rem 1.5rem;
  align-items: end;
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}

label {
  display: grid;
  gap: 0.4rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

label.checkbox {
  grid-auto-flow: column;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.5rem;
}

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

select {
  background: #0f0f14;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.5rem;
  font: inherit;
}

output {
  color: var(--text);
}

.actions {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

button {
  font: 0.85rem var(--mono);
  color: var(--text);
  background: #1b1b22;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.9rem;
  cursor: pointer;
}

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

button:disabled {
  opacity: 0.5;
  cursor: default;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b0b0d;
  font-weight: 600;
}

button.link {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent);
  text-decoration: underline;
}

#status {
  margin: 0;
  min-height: 1.6em;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
}

footer p {
  color: var(--muted);
  font-size: 0.85rem;
  max-width: 70ch;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}

@media (max-width: 720px) {
  #stage {
    grid-template-columns: 1fr;
  }
}