/* --- base --- */
[hidden]{display:none!important}
img{max-width:100%}
:root{
  --ink:#131a1f; --panel:#1a2228; --panel-2:#212b32; --line:#2f3d46;
  --text:#eef3f5; --muted:#93a5af; --faint:#6a7c85;
  --paper:#ffffff;
  --copper:#c96a2c; --copper-soft:#e08a4d; --teal:#3d87a8; --brass:#c79a34; --green:#4f9d6a;
  --shadow:0 12px 34px rgba(0,0,0,.38);
  color-scheme:dark;
}
:root[data-theme="light"]{
  --ink:#e8ebed; --panel:#f7f8f9; --panel-2:#edf0f2; --line:#d4dadd;
  --text:#151d22; --muted:#5b6d77; --faint:#84959e;
  --shadow:0 12px 34px rgba(20,30,36,.13);
  color-scheme:light;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--ink);color:var(--text);overflow:hidden;
  font-family:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:14px;line-height:1.45}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--copper-soft);outline-offset:2px}
.app{display:grid;grid-template-columns:326px 1fr;height:100vh;height:100dvh}

/* ---------- rail ---------- */
.rail{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
.rail-head{padding:15px 18px 13px;border-bottom:1px solid var(--line);display:flex;align-items:flex-start;gap:10px}
.mark{width:26px;height:26px;flex:none;margin-top:2px}
.brand{display:flex;flex-direction:column;gap:0;min-width:0}
.brand h1{margin:0;font-family:"IBM Plex Sans Condensed",sans-serif;font-size:21px;font-weight:700;letter-spacing:.02em}
.brand .tag{font-size:11.5px;color:var(--muted)}
.rail-body{overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:14px;flex:1;min-height:0}
.block{display:flex;flex-direction:column;gap:8px}
.block-title{font-family:"IBM Plex Sans Condensed",sans-serif;font-size:11px;font-weight:600;letter-spacing:.12em;
  text-transform:uppercase;color:var(--faint);display:flex;justify-content:space-between;align-items:baseline;gap:8px}

.doc-card{background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:10px 12px;display:flex;flex-direction:column;gap:7px}
.doc-name{font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.doc-meta{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--faint)}
.pager{display:flex;align-items:center;gap:6px}
.pager .btn{padding:4px 9px}
.pager .n{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--muted);flex:1;text-align:center}

/* scale card */
.scale{border:1px solid var(--line);border-radius:10px;padding:13px 14px;display:flex;flex-direction:column;gap:9px;
  background:linear-gradient(180deg,rgba(201,106,44,.10),transparent 70%),var(--panel-2)}
.scale.warn{background:var(--panel-2);border-color:var(--brass)}
.scale.calibrating{border-color:var(--brass);box-shadow:inset 0 0 0 1px var(--brass)}
.scale-top{display:flex;align-items:baseline;justify-content:space-between;gap:8px}
.ratio{font-family:"IBM Plex Mono",monospace;font-size:24px;font-weight:600;letter-spacing:-.01em}
.chip{font-family:"IBM Plex Sans Condensed",sans-serif;font-size:10px;font-weight:700;letter-spacing:.09em;
  text-transform:uppercase;padding:3px 7px;border-radius:5px;white-space:nowrap}
.chip.ok{background:rgba(79,157,106,.18);color:var(--green)}
.chip.warn{background:rgba(199,154,52,.18);color:var(--brass)}
.chip.man{background:rgba(61,135,168,.2);color:#7cc0dd}
.scale-line{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.scale-note{font-size:11.5px;color:var(--muted);line-height:1.45}
.evidence{display:flex;flex-direction:column;gap:4px;border-top:1px solid var(--line);padding-top:9px}
.ev-row{display:flex;justify-content:space-between;gap:10px;font-size:11.5px;color:var(--muted)}
.ev-row b{font-family:"IBM Plex Mono",monospace;font-weight:500;color:var(--text);font-variant-numeric:tabular-nums}

/* readout */
.readout{background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:13px 14px}
.readout .state{font-family:"IBM Plex Sans Condensed",sans-serif;font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--copper-soft);font-weight:600}
.big{font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums;font-size:31px;line-height:1.15;
  font-weight:500;letter-spacing:-.02em;margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.big .u{font-size:15px;color:var(--muted);margin-left:4px}
.sub3{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:11px;padding-top:10px;border-top:1px solid var(--line)}
.sub3 > div{display:flex;flex-direction:column;gap:1px;min-width:0}
.sub3 .k{font-family:"IBM Plex Sans Condensed",sans-serif;font-size:10px;letter-spacing:.09em;text-transform:uppercase;
  color:var(--faint);font-weight:600}
.sub3 .v{font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums;font-size:12.5px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.btn{background:var(--panel-2);border:1px solid var(--line);border-radius:8px;padding:7px 11px;cursor:pointer;
  font-size:13px;display:inline-flex;align-items:center;justify-content:center;gap:7px;transition:background .12s,border-color .12s}
.btn:hover{background:var(--line)}
.btn.primary{background:var(--copper);border-color:var(--copper);color:#fff;font-weight:500}
.btn.primary:hover{background:var(--copper-soft);border-color:var(--copper-soft)}
.btn.ghost{background:transparent}
.btn.ghost:hover{background:var(--panel-2)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-row{display:flex;gap:8px}
.btn-row .btn{flex:1;min-width:0}
.btn-row.wide{margin-top:18px;width:100%}
.block.grow{flex:1}
.field{display:flex;gap:8px}
.field input{flex:1;min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:7px;padding:7px 9px;
  font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums}

.list{display:flex;flex-direction:column;gap:5px}
.item{display:grid;grid-template-columns:30px 1fr auto;align-items:center;gap:8px;background:var(--panel-2);
  border:1px solid transparent;border-radius:8px;padding:6px 7px 6px 9px;cursor:pointer;text-align:left}
.item:hover{border-color:var(--line)}
.item.sel{border-color:var(--copper);background:rgba(201,106,44,.13)}
.item .tag{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--teal);font-weight:600}
.item.sel .tag{color:var(--copper-soft)}
.item .val{font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums;font-size:13px;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:block}
.item .note{font-size:11px;color:var(--faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.item .del{border:0;background:none;color:var(--faint);cursor:pointer;padding:2px 5px;border-radius:5px;font-size:15px;line-height:1}
.item .del:hover{background:var(--line);color:var(--text)}
.empty{font-size:12.5px;color:var(--faint);line-height:1.5;padding:0 2px}
.help{font-size:11.5px;color:var(--faint);line-height:1.75;border-top:1px solid var(--line);padding:11px 16px}
.help kbd{font-family:"IBM Plex Mono",monospace;font-size:10.5px;background:var(--panel-2);border:1px solid var(--line);
  border-radius:4px;padding:1px 5px;color:var(--muted)}

/* ---------- stage ---------- */
.stage{position:relative;min-width:0;background:var(--paper);overflow:hidden}
canvas#cv{display:block;width:100%;height:100%;touch-action:none;cursor:crosshair}
.stage.panning canvas#cv{cursor:grabbing}
.stage.blank{background:var(--ink)}

.toolbar{position:absolute;top:12px;left:12px;display:flex;gap:6px;align-items:center;background:var(--panel);
  border:1px solid var(--line);border-radius:10px;padding:5px;box-shadow:var(--shadow);flex-wrap:wrap;max-width:calc(100% - 24px)}
.toolbar .btn{padding:5px 9px;font-size:12.5px}
.seg{display:flex;background:var(--panel-2);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{background:none;border:0;padding:5px 11px;cursor:pointer;font-size:12.5px;color:var(--muted)}
.seg button[aria-pressed="true"]{background:var(--copper);color:#fff;font-weight:500}
.zoomval{font-family:"IBM Plex Mono",monospace;font-size:12px;min-width:50px;text-align:center;color:var(--muted);font-variant-numeric:tabular-nums}
.sep{width:1px;align-self:stretch;background:var(--line);margin:2px 1px}
.toolbar select{background:var(--panel-2);border:1px solid var(--line);border-radius:7px;padding:5px 7px;font-size:12.5px;cursor:pointer}
.tgl{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted);padding:5px 9px;cursor:pointer;
  border:1px solid var(--line);border-radius:8px;background:var(--panel-2)}
.tgl input{accent-color:var(--brass);margin:0}

.hint{position:absolute;bottom:12px;left:12px;background:var(--panel);border:1px solid var(--line);border-radius:8px;
  padding:7px 12px;font-size:12px;color:var(--muted);box-shadow:var(--shadow);display:flex;align-items:center;gap:8px;
  max-width:min(560px,calc(100% - 24px))}
.hint .dot{width:7px;height:7px;border-radius:50%;background:var(--copper);flex:none}
.hint.calib .dot{background:var(--brass)}
.loupe{position:absolute;top:12px;right:12px;width:146px;height:146px;border-radius:50%;border:1px solid var(--line);
  box-shadow:var(--shadow);overflow:hidden;background:#fff;display:none;pointer-events:none}
.loupe.on{display:block}
.loupe canvas{width:146px;height:146px}

/* drop / empty */
.drop{position:absolute;inset:0;display:none;align-items:center;justify-content:center;padding:28px;
  background:var(--ink);z-index:5}
.drop.on{display:flex}
.dropbox{max-width:560px;width:100%;border:1.5px dashed var(--line);border-radius:16px;padding:34px 34px 28px;
  text-align:center;display:flex;flex-direction:column;align-items:center;gap:8px;background:var(--panel);transition:border-color .15s,background .15s}
.dragging .dropbox{border-color:var(--copper);background:var(--panel-2)}
.dropbox h2{margin:0;font-family:"IBM Plex Sans Condensed",sans-serif;font-size:24px;font-weight:700;letter-spacing:.01em}
.dropbox p{margin:0;color:var(--muted);font-size:13.5px;max-width:42ch;line-height:1.55}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px;width:100%;text-align:left}
.step{background:var(--panel-2);border:1px solid var(--line);border-radius:10px;padding:11px 12px;display:flex;flex-direction:column;gap:3px}
.step .n{font-family:"IBM Plex Mono",monospace;font-size:10.5px;color:var(--copper-soft);font-weight:600}
.step .t{font-size:12.5px;font-weight:500}
.step .d{font-size:11.5px;color:var(--faint);line-height:1.4}
.formats{font-size:11.5px;color:var(--faint);margin-top:16px}
.overlay-drag{position:absolute;inset:0;z-index:9;display:none;align-items:center;justify-content:center;
  background:rgba(19,26,31,.82);backdrop-filter:blur(2px);pointer-events:none}
.dragging .overlay-drag{display:flex}
.overlay-drag div{border:2px dashed var(--copper);border-radius:16px;padding:26px 40px;font-size:17px;
  font-family:"IBM Plex Sans Condensed",sans-serif;font-weight:600;letter-spacing:.02em;color:#fff;background:rgba(201,106,44,.13)}

.busy{position:absolute;inset:0;z-index:7;display:none;align-items:center;justify-content:center;background:rgba(19,26,31,.72);backdrop-filter:blur(2px)}
.busy.on{display:flex}
.busy .card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px 24px;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:13px;font-size:13.5px}
.spin{width:17px;height:17px;border:2px solid var(--line);border-top-color:var(--copper);border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spin{animation-duration:2.4s}}

.banner{background:rgba(199,154,52,.10);border:1px solid var(--brass);border-radius:9px;
  padding:8px 8px 8px 12px;display:none;align-items:flex-start;gap:8px;font-size:12px;line-height:1.45;color:var(--muted)}
.banner.on{display:flex}
.banner span{flex:1}
.banner b{font-weight:600;color:var(--text)}
.banner button{background:none;border:0;color:var(--faint);cursor:pointer;font-size:16px;line-height:1;padding:2px 4px;border-radius:5px}
.banner button:hover{background:var(--panel-2);color:var(--text)}

@media (max-width:860px){
  .app{grid-template-columns:1fr;grid-template-rows:minmax(0,1fr) auto}
  .stage{order:-1}
  .rail{border-right:0;border-top:1px solid var(--line);max-height:48vh}
  .loupe{display:none!important}
  .banner{max-width:calc(100% - 24px)}
  .steps{grid-template-columns:1fr}
}