:root {
  --bg: #f4f5f7;
  --panel: #fff;
  --line: #dcdfe4;
  --ink: #1c2024;
  --muted: #6b7280;
  --accent: #0f9d78;
  --accent-dark: #0b7c5f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 60px;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.5 "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}

header {
  max-width: 840px;
  margin: 0 auto;
  padding: 56px 0 22px;
  text-align: center;
}
header h1 { margin: 0 0 8px; font-size: 30px; letter-spacing: -.015em; }
header p { margin: 0; color: var(--muted); }
header .cross { margin-top: 10px; font-size: 14px; }
header a { color: var(--accent-dark); }

.muted { color: var(--muted); }

button {
  font: inherit;
  cursor: pointer;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  border-radius: 6px;
  padding: 6px 12px;
}
button:hover { border-color: #b9bec6; }

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

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
  padding: 10px 22px;
}
button.primary:hover { background: var(--accent-dark); }
button.primary:disabled { background: #a8b0b8; border-color: #a8b0b8; cursor: default; }

input[type="number"], input[type="text"] {
  font: inherit;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  background: #fff;
  color: inherit;
}
input[type="number"] { width: 72px; }

.drop {
  max-width: 840px;
  margin: 0 auto;
  padding: 58px 20px;
  border: 2px dashed #ccd1d8;
  border-radius: 14px;
  background: var(--panel);
  text-align: center;
  transition: border-color .15s, background .15s;
}
.drop p { margin: 4px 0; }
.drop.over { border-color: var(--accent); background: #eefaf6; }

main {
  max-width: 1100px;
  margin: 0 auto;
}

.filebar, .viewbar {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 10px;
}
.filebar .name { font-weight: 600; }

.tabs { display: flex; }
.tabs button {
  border-radius: 0;
  border-right-width: 0;
}
.tabs button:first-child { border-radius: 6px 0 0 6px; }
.tabs button:last-child { border-radius: 0 6px 6px 0; border-right-width: 1px; }
.tabs button.on {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.pager { display: flex; align-items: center; gap: 6px; }
.pager input { width: 68px; }

.hint {
  margin: 0 0 10px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.stage {
  display: flex;
  justify-content: center;
  padding: 16px;
  background: #e6e8ec;
  border: 1px solid var(--line);
  border-radius: 10px;
}
.stage canvas {
  max-width: 100%;
  background: #fff;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .18);
  touch-action: none;
}

.controls {
  margin-top: 12px;
  padding: 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 12px;
}

.group {
  padding: 10px 12px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcfd;
}
.group.span { grid-column: 1 / -1; }

.group h3 {
  margin: 0 0 9px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
}

.field {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.field + .field { margin-top: 9px; }
.field input[type="range"] { flex: 1; min-width: 200px; accent-color: var(--accent); }

.pair { display: inline-flex; align-items: center; gap: 5px; }
.pair .tag { color: var(--muted); font-size: 13px; }
.unit { color: var(--muted); }

label.check { display: inline-flex; align-items: center; gap: 7px; }
label.check input { accent-color: var(--accent); }

.note { margin: 9px 0 0; font-size: 13px; min-height: 1em; }

.actions {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.actions a { color: var(--accent-dark); font-size: 14px; }

.install { margin-top: 18px; padding: 8px 18px; font-size: 14px; }

[hidden] { display: none !important; }

select {
  font: inherit;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  background: #fff;
  color: inherit;
}

.pill {
  min-width: 46px;
  text-align: center;
  padding: 4px 8px;
  border-radius: 999px;
  background: #eef1f4;
  font-variant-numeric: tabular-nums;
}

.result {
  width: min(1000px, 92vw);
  max-height: 88vh;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0;
  background: var(--panel);
  color: var(--ink);
}
.result::backdrop { background: rgba(12, 16, 20, .55); }

.result-head {
  position: sticky;
  top: 0;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.result-head .link { margin-left: auto; }

.result-grid {
  display: grid;
  align-items: end;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  padding: 18px;
}
.result-grid figure {
  margin: 0;
  text-align: center;
}
.result-grid canvas {
  width: 100%;
  height: auto;
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .12);
}
.result-grid figcaption {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

footer {
  max-width: 1100px;
  margin: 28px auto 0;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}
footer a { color: var(--accent-dark); }
footer p { margin: 0; }
footer .also {
  max-width: 700px;
  margin: 0 auto 14px;
  font-size: 14px;
  color: var(--ink);
  text-wrap: balance;
}

@media (max-width: 700px) {
  body { padding: 0 10px 40px; }
  header { padding: 30px 0 16px; }
  header h1 { font-size: 24px; }
  header p { font-size: 14px; }
  .stage { padding: 8px; }
  .controls { padding: 10px; }
  .groups { grid-template-columns: 1fr; }
  .field input[type="range"] { min-width: 120px; }
}