:root {
  --bg: #f3f3f1;
  --panel: #ffffff;
  --ink: #1d1d1f;
  --muted: #6b6b70;
  --line: #dcdcd8;
  --accent: #b5561c;
  --accent-ink: #ffffff;
  --warn-bg: #fff6e0;
  --warn-line: #e8c46a;
  --err-bg: #fde8e6;
  --err-line: #e0877f;
  --view-bg: #fbfbfa;
  --radius: 8px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1b1d;
    --panel: #242427;
    --ink: #ececef;
    --muted: #a0a0a8;
    --line: #3a3a3f;
    --accent: #e0864a;
    --accent-ink: #1b1b1d;
    --warn-bg: #3a3120;
    --warn-line: #8a6d2a;
    --err-bg: #3d2322;
    --err-line: #8f4540;
    --view-bg: #fbfbfa;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); }
button, input, select { font: inherit; color: inherit; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 10px 16px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--accent); }
.brand h1 { margin: 0; font-size: 18px; color: var(--ink); }
.brand p { margin: 0; font-size: 12px; color: var(--muted); }
.top-actions { display: flex; gap: 6px; flex-wrap: wrap; }

button, .file-btn {
  border: 1px solid var(--line); background: var(--panel); border-radius: 6px;
  padding: 5px 10px; cursor: pointer; font-size: 13px; line-height: 1.3;
}
button:hover, .file-btn:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
button.ghost, .file-btn.ghost { background: transparent; }
select.lang { border: 1px solid var(--line); background: transparent; border-radius: 6px; padding: 4px 6px; font-size: 13px; cursor: pointer; }
select.lang:hover { border-color: var(--accent); }

.layout { display: grid; grid-template-columns: 330px 1fr; min-height: calc(100vh - 58px); }

.params {
  background: var(--panel); border-right: 1px solid var(--line); padding: 12px 14px 24px;
  overflow-y: auto; max-height: calc(100vh - 58px); position: sticky; top: 0;
}
.params fieldset, .cam-params fieldset { border: none; padding: 0; margin: 0 0 14px; }
.params legend, .cam-params legend { font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); margin-bottom: 6px; }
.field { display: grid; grid-template-columns: 1fr 92px; align-items: center; gap: 6px; margin: 4px 0; font-size: 13px; }
.field.pair { grid-template-columns: 1fr 70px 12px 70px; }
.field.pair span.x { text-align: center; color: var(--muted); }
.field input[type=number], .field select {
  width: 100%; padding: 4px 6px; border: 1px solid var(--line); border-radius: 5px; background: var(--bg); text-align: right;
}
.field select { text-align: left; }
.field.wide { grid-template-columns: 1fr; }
.field .hint, .hint { color: var(--muted); font-size: 12px; }
.field-hint { grid-column: 1 / -1; color: var(--muted); font-size: 11.5px; margin-top: -2px; line-height: 1.3; }
.params .preset { width: 100%; }

.workspace { padding: 12px 16px 24px; min-width: 0; display: flex; flex-direction: column; gap: 10px; }

.summary { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 10px; }
.card .k { font-size: 11.5px; color: var(--muted); }
.card .v { font-size: 17px; font-weight: 650; font-variant-numeric: tabular-nums; }
.card .s { font-size: 11.5px; color: var(--muted); }

.messages { display: flex; flex-direction: column; gap: 6px; }
.msg { padding: 7px 10px; border-radius: 6px; font-size: 13px; border: 1px solid; }
.msg.warn { background: var(--warn-bg); border-color: var(--warn-line); }
.msg.err { background: var(--err-bg); border-color: var(--err-line); }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.tabs button { border: none; border-bottom: 3px solid transparent; border-radius: 0; background: none; padding: 8px 12px; font-weight: 600; color: var(--muted); }
.tabs button.active { color: var(--ink); border-bottom-color: var(--accent); }

.tab-panel { display: none; flex-direction: column; gap: 8px; }
.tab-panel.active { display: flex; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 13px; }
.toolbar .sep { width: 1px; height: 20px; background: var(--line); }
.toolbar input.short { width: 64px; padding: 3px 5px; border: 1px solid var(--line); border-radius: 5px; background: var(--bg); }
.toolbar select { padding: 3px 5px; border: 1px solid var(--line); border-radius: 5px; background: var(--bg); }
.check { display: inline-flex; gap: 4px; align-items: center; }
.range { display: inline-flex; gap: 6px; align-items: center; }
.range input { width: 220px; }
.range output { font-variant-numeric: tabular-nums; min-width: 70px; }

.svg-view {
  background: var(--view-bg); border: 1px solid var(--line); border-radius: var(--radius);
  height: calc(100vh - 290px); min-height: 380px; overflow: hidden; position: relative; touch-action: none; cursor: grab;
}
.svg-view:active { cursor: grabbing; }
.svg-view > svg { width: 100%; height: 100%; display: block; }

.canvas-wrap { position: relative; height: calc(100vh - 290px); min-height: 380px; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.canvas-wrap canvas { width: 100%; height: 100%; display: block; touch-action: none; }
.canvas-hint { position: absolute; left: 10px; bottom: 8px; font-size: 11.5px; color: #777; pointer-events: none; }

.stl-info { font-size: 13px; color: var(--muted); }
.stl-info b { color: var(--ink); }

.cam-grid { display: grid; grid-template-columns: 300px 1fr; gap: 14px; align-items: start; }
.cam-params { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; }
.cam-params .field.sel { grid-template-columns: 1fr; gap: 3px; }
.cam-params .field.sel select { width: 100%; }
.cam-params .field { grid-template-columns: 1fr 84px; }
.cam-params .field.pair { grid-template-columns: 1fr 62px 12px 62px; }
.cam-intro { margin: 0 0 10px; font-size: 12.5px; color: var(--muted); line-height: 1.4; }
.cam-main { min-width: 0; display: flex; flex-direction: column; gap: 8px; }
.cam-canvas { height: 62vh; min-height: 360px; }
.cam-h { margin: 8px 0 0; font-size: 15px; }
.cam-back-hint { margin: 0; line-height: 1.4; }
.table-wrap { overflow-x: auto; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
table.data { border-collapse: collapse; width: 100%; font-size: 13px; }
table.data th, table.data td { padding: 6px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
table.data th { font-size: 12px; color: var(--muted); font-weight: 600; }
table.data tr:last-child td { border-bottom: none; }
table.data td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.data td.ok { color: #2e8a4a; }
table.data td.bad { color: #c0392b; font-weight: 600; }
table.data .hint { font-size: 11.5px; }

#print-area { display: none; }

@media (max-width: 1100px) {
  .cam-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .params { position: static; max-height: none; border-right: none; border-bottom: 1px solid var(--line); }
  .svg-view, .canvas-wrap { height: 70vh; }
}

@media print {
  body > *:not(#print-area) { display: none !important; }
  html, body { background: #fff; }
  #print-area { display: block; }
  .print-page { page-break-after: always; break-after: page; }
  .print-page:last-child { page-break-after: auto; break-after: auto; }
  .print-page svg { display: block; }
}

[hidden] { display: none !important; }