:root {
  --bg: #f3efe7;
  --ink: #161616;
  --muted: #5f5a52;
  --panel: #fffdf8;
  --line: #dfd6c9;
  --accent: #b4441f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 0% 0%, #e6dccd 0%, transparent 70%),
    radial-gradient(1100px 500px at 100% 20%, #efe3d1 0%, transparent 72%),
    var(--bg);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
}

.layout {
  max-width: 1060px;
  margin: 0 auto;
  padding: 24px 16px 40px;
  display: grid;
  gap: 18px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
}

.hero p {
  margin: 8px 0 0;
  color: var(--muted);
}

.panel {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 12px;
  padding: 14px;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

.single-wrap {
  display: grid;
  gap: 14px;
  grid-template-columns: 192px 1fr;
  align-items: start;
}

canvas {
  image-rendering: pixelated;
  width: 192px;
  height: 192px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.controls {
  display: grid;
  gap: 8px;
}

.control-row {
  display: grid;
  grid-template-columns: 110px 1fr 72px;
  align-items: center;
  gap: 8px;
}

.control-row label {
  font-size: 0.85rem;
  color: var(--muted);
}

.control-row output {
  text-align: right;
  font-size: 0.8rem;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
}

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

.sweep-grid,
.recon-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

figure {
  margin: 0;
}

figcaption {
  margin-top: 6px;
  font-size: 0.82rem;
  color: var(--muted);
}

.fit-tools {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: grid;
  gap: 10px;
}

.fit-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.fit-actions label {
  font-size: 0.85rem;
  color: var(--muted);
  align-self: center;
}

.fit-actions input[type="number"] {
  width: 92px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 8px;
  padding: 6px 8px;
}

.addon-tools {
  background: #fffaf3;
}

#seededFitStatus {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

button {
  border: 1px solid var(--line);
  background: #fffaf0;
  color: var(--ink);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 0.86rem;
  cursor: pointer;
}

button:hover {
  border-color: #c8b8a3;
}

#fitStatus {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.plot-canvas {
  width: 100%;
  max-width: 640px;
  height: 180px;
  image-rendering: auto;
}

@media (max-width: 820px) {
  .single-wrap {
    grid-template-columns: 1fr;
  }
}