:root {
  --bg: #f4f5f7; --panel: #ffffff; --ink: #1d2330; --muted: #6b7385; --line: #e2e5eb;
  --accent: #2f6fed; --accent-ink: #fff; --ok: #1f8a4c; --bad: #c8372d; --warn: #b7791f;
  --chip: #eef1f6; --changed: #fff6d6; --shadow: 0 1px 2px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.04);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b; --panel: #1a1e26; --ink: #e6e9ef; --muted: #9098a8; --line: #2a303b;
    --accent: #5b8cff; --chip: #232936; --changed: #3a3320; --shadow: none; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; background: var(--bg); color: var(--ink);
       display: flex; flex-direction: column; }
button, select, input { font: inherit; color: inherit; }
button { border: 1px solid var(--line); background: var(--panel); border-radius: 8px; padding: 6px 12px; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.ghost { background: transparent; }
button:disabled { opacity: .5; cursor: progress; }
.bar { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--panel);
       border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.brand { font-weight: 700; letter-spacing: .2px; }
.brand span { font-weight: 400; color: var(--muted); }
.spacer { flex: 1; }
.pill { padding: 3px 10px; border-radius: 99px; background: var(--chip); font-size: 12px; white-space: nowrap; }
.pill.ok { background: color-mix(in srgb, var(--ok) 18%, transparent); color: var(--ok); }
.pill.bad { background: color-mix(in srgb, var(--bad) 18%, transparent); color: var(--bad); }
main { flex: 1; display: grid; grid-template-columns: minmax(340px, 420px) 1fr; gap: 12px; padding: 12px; min-height: 0; }
@media (max-width: 900px) { main { grid-template-columns: 1fr; } }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow);
         overflow: auto; min-height: 0; }
#params { padding: 10px; }
.result { display: flex; flex-direction: column; }
.tabs { display: flex; gap: 4px; padding: 8px 8px 0; border-bottom: 1px solid var(--line); position: sticky; top: 0;
        background: var(--panel); z-index: 2; }
.tabs button { border: none; border-bottom: 2px solid transparent; border-radius: 0; background: none; padding: 8px 12px; }
.tabs button.active { border-bottom-color: var(--accent); font-weight: 600; }
.tab { display: none; padding: 12px; flex: 1; min-height: 0; }
.tab.active { display: block; }
#tab-viewer.active { display: flex; flex-direction: column; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 12px; }
.card h3 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .4px; color: var(--muted); }
.card h3 small { text-transform: none; letter-spacing: 0; font-weight: 400; margin-left: 6px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 1200px) { .grid2 { grid-template-columns: 1fr; } }
.muted { color: var(--muted); }
.error { background: color-mix(in srgb, var(--bad) 14%, transparent); color: var(--bad); padding: 10px 12px;
         border-radius: 8px; margin-bottom: 12px; white-space: pre-wrap; }

/* module cards */
details.mod { border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px; }
details.mod > summary { list-style: none; cursor: pointer; padding: 8px 10px; display: flex; align-items: center; gap: 8px; }
details.mod > summary::-webkit-details-marker { display: none; }
details.mod > summary::before { content: "▸"; color: var(--muted); transition: transform .15s; }
details.mod[open] > summary::before { transform: rotate(90deg); }
.mod-title { font-weight: 600; }
.mod-kind { font-size: 11px; color: var(--muted); background: var(--chip); padding: 1px 7px; border-radius: 99px; }
.mod-body { padding: 4px 10px 10px; }
.mod-desc { color: var(--muted); font-size: 12px; margin: 0 0 8px; }
.mod-actions { display: flex; gap: 6px; margin-left: auto; }
.mod-actions button { padding: 2px 8px; font-size: 12px; }
.row { display: grid; grid-template-columns: 1fr 150px 22px; align-items: center; gap: 6px; padding: 3px 4px; border-radius: 6px; }
.row.changed { background: var(--changed); }
.row label { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row label small { display: block; color: var(--muted); font-size: 11px; white-space: normal; line-height: 1.25; }
.row input[type=number], .row input[type=text], .row select { width: 100%; padding: 4px 6px; border: 1px solid var(--line);
       border-radius: 6px; background: var(--bg); }
.row .reset { border: none; background: none; padding: 0; color: var(--muted); visibility: hidden; }
.row.changed .reset { visibility: visible; }
.field { display: flex; flex-direction: column; gap: 2px; font-size: 12px; color: var(--muted); }
.field.inline { flex-direction: row; align-items: center; gap: 6px; }
.field select, .field input { padding: 4px 6px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); }
.add-row { display: flex; gap: 6px; margin: 6px 0 12px; }
.add-row select { flex: 1; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
td, th { padding: 4px 6px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 500; font-size: 12px; }
td.num { text-align: right; font-variant-numeric: tabular-nums; }
.objtable input[type=number] { width: 64px; padding: 3px 5px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); }
.swatch { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.ok-dot, .bad-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; }
.ok-dot { background: var(--ok); } .bad-dot { background: var(--bad); }
.summary { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }
.stat { border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; min-width: 110px; }
.stat b { display: block; font-size: 20px; }
.stat span { color: var(--muted); font-size: 12px; }
#svg-wrap svg { width: 100%; height: auto; max-height: 72vh; display: block; }
#svg-wrap text { font-family: system-ui, sans-serif; } /* size comes from each label (mm) */

/* viewer */
.viewer-tools { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; padding-bottom: 8px; }
#viewer { flex: 1; min-height: 480px; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; position: relative; }
#viewer .empty { position: absolute; inset: 0; display: grid; place-items: center; color: var(--muted); }
#viewer canvas { display: block; }

/* build */
.stage { display: flex; align-items: center; gap: 10px; }
.spinner { width: 14px; height: 14px; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%;
           animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.log { font: 12px ui-monospace, monospace; background: var(--bg); padding: 8px; border-radius: 8px; max-height: 160px; overflow: auto; white-space: pre-wrap; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px; }
.gallery img { width: 100%; border-radius: 8px; border: 1px solid var(--line); cursor: zoom-in; }
dialog { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--ink); max-width: min(900px, 94vw); }
dialog pre { max-height: 70vh; overflow: auto; font-size: 12px; }
dialog menu { display: flex; justify-content: flex-end; padding: 0; margin: 8px 0 0; }

.downloads { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.downloads a { text-decoration: none; }
a.btn { display: inline-block; border: 1px solid var(--line); border-radius: 8px; padding: 6px 12px; color: var(--ink); }
a.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
#motion { padding: 0 0 8px; min-height: 1.4em; }
#motion .bad { color: var(--bad); font-weight: 600; }
#motion .good { color: var(--ok); font-weight: 600; }
.progress { height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; margin-top: 6px; }
.progress > div { height: 100%; background: var(--accent); width: 0; transition: width .2s; }

.mod-desc.note { background: #fff6dd; border-left: 3px solid #e0b100; padding: 4px 8px; border-radius: 4px; }