:root {
  /* Sunrise Robotics brand palette */
  --sr-red:    #fa6147;   /* Sunrise Red */
  --sr-purple: #545268;   /* Mechanical Purple */
  --sr-gray:   #e5e5df;   /* Bright Gray */
  --sr-yellow: #f8bb3e;   /* Warm Yellow */
  --sr-blue:   #557cdb;   /* Futuristic Blue */
  --ui-red:    #eb323c;   /* UI Red */
  --ui-green:  #15c460;   /* UI Green */

  /* Dark UI surfaces — Mechanical Purple tones */
  --bg-ws:     #1f1e2c;
  --bg-side:   #272636;
  --bg-panel:  #2e2d40;
  --bg-input:  #36354a;
  --bd:        #4a4860;
  --bd-sub:    #302f42;

  /* Text — Bright Gray scale */
  --txt:       #e5e5df;
  --txt-l:     #b0afc6;
  --txt-m:     #7a788e;

  /* Semantic */
  --accent:    var(--sr-red);
  --accent-bg: rgba(250,97,71,.11);
  --warn:      var(--sr-yellow);
  --danger:    var(--ui-red);
  --ok:        var(--ui-green);

  /* Typography — Helvetica/Arial per SR system typeface spec */
  --fu:        'Universal Sans','Helvetica Neue',Helvetica,Arial,sans-serif;
  --fm:        ui-monospace,'Cascadia Code','JetBrains Mono',monospace;
  --r:         3px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg-ws);
  color: var(--txt);
  font-family: var(--fu);
  font-size: 13px;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── App Nav ── */
.app-nav {
  background: var(--bg-side);
  border-bottom: 1px solid var(--bd-sub);
  display: flex;
  align-items: center;
  padding: 0 16px;
  height: 44px;
  flex-shrink: 0;
  gap: 24px;
  z-index: 10;
}

.app-nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--txt);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.app-nav-brand svg { color: var(--accent); flex-shrink: 0; }

.app-nav-tabs {
  display: flex;
  gap: 3px;
  height: 100%;
  align-items: center;
}

.nav-tab {
  background: transparent;
  border: none;
  color: var(--txt-m);
  font-family: var(--fu);
  font-size: 12px;
  font-weight: 500;
  padding: 5px 13px;
  border-radius: var(--r);
  cursor: pointer;
  transition: color .1s, background .1s;
  height: 28px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-tab:hover { color: var(--txt); background: var(--bg-panel); }
.nav-tab.active { color: var(--sr-red); background: var(--accent-bg); }
.nav-tab svg { opacity: .6; }
.nav-tab.active svg { opacity: 1; color: var(--sr-red); }

/* ── App Body ── */
.app-body {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.feature-panel {
  position: absolute;
  inset: 0;
  display: none;
}

.feature-panel.active { display: flex; }

/* ── Sidebar ── */
.sb {
  width: 268px;
  flex-shrink: 0;
  background: var(--bg-side);
  border-right: 1px solid var(--bd-sub);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sb-hd {
  padding: 14px 14px 13px;
  border-bottom: 1px solid var(--bd-sub);
  display: flex;
  align-items: center;
  gap: 9px;
}

.sb-hd svg { flex-shrink: 0; color: var(--accent); }

.sb-hd h1 {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--txt);
}

.sec {
  padding: 11px 13px;
  border-bottom: 1px solid var(--bd-sub);
}

.lbl {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--sr-red);
  margin-bottom: 7px;
  display: block;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: var(--r);
  font-size: 12px;
  font-family: var(--fu);
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background .1s, color .1s, border-color .1s;
  width: 100%;
}

.btn + .btn { margin-top: 5px; }

.btn-g {
  background: transparent;
  color: var(--txt-l);
  border-color: var(--bd);
}
.btn-g:hover {
  background: var(--bg-panel);
  color: var(--txt);
  border-color: var(--sr-red);
}

.btn-p {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 600;
  letter-spacing: .04em;
}
.btn-p:hover { background: #fb7560; border-color: #fb7560; }

.btn-t {
  background: transparent;
  color: var(--txt-m);
  border-color: var(--bd-sub);
  justify-content: flex-start;
  padding: 6px 10px;
  gap: 7px;
}
.btn-t.on {
  background: var(--accent-bg);
  color: var(--accent);
  border-color: var(--accent);
}
.btn-t:not(.on):hover {
  background: var(--bg-panel);
  color: var(--txt);
}
.btn-t:disabled, .btn-g:disabled {
  opacity: .4;
  cursor: not-allowed;
  pointer-events: none;
}

.tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5px;
}

input.inp {
  background: var(--bg-input);
  border: 1px solid var(--bd);
  color: var(--txt);
  border-radius: 3px;
  padding: 6px 8px;
  font-size: 12px;
  font-family: var(--fu);
  width: 100%;
  outline: none;
  transition: border-color .1s;
}
input.inp:focus { border-color: var(--accent); }
input.inp:disabled { opacity: .5; cursor: not-allowed; }

.hint {
  font-size: 11px;
  color: var(--txt-m);
  margin-top: 7px;
  line-height: 1.45;
}

/* ── ROI / Class list ── */
.roi-list {
  flex: 1;
  overflow-y: auto;
  padding: 7px;
}
.roi-list::-webkit-scrollbar { width: 3px; }
.roi-list::-webkit-scrollbar-thumb { background: var(--bd); border-radius: 2px; }

.ri {
  background: var(--bg-panel);
  border: 1px solid var(--bd-sub);
  border-radius: var(--r);
  padding: 8px;
  margin-bottom: 5px;
  cursor: pointer;
  transition: border-color .1s;
}
.ri.sel { border-color: var(--accent); background: var(--accent-bg); }
.ri:not(.sel):hover { border-color: var(--bd); }

.ri-hd {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 6px;
}
.ri-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  flex-shrink: 0;
}
.ri-num {
  font-size: 10px;
  font-weight: 700;
  color: var(--txt-m);
  font-family: var(--fm);
  flex: 1;
  letter-spacing: .04em;
}
.ri-del {
  background: transparent;
  border: none;
  color: var(--danger);
  padding: 3px 5px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
  opacity: .5;
  transition: opacity .1s;
}
.ri-del:hover { opacity: 1; background: rgba(239,68,68,.1); }

.ri-coords {
  font-size: 10px;
  font-family: var(--fm);
  color: var(--txt-m);
  margin-top: 5px;
  line-height: 1.4;
  word-break: break-all;
}

/* ── Stack Estimation: class items ── */
.ci {
  background: var(--bg-panel);
  border: 1px solid var(--bd-sub);
  border-radius: var(--r);
  padding: 7px 9px;
  margin-bottom: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: border-color .1s;
}
.ci.sel { border-color: var(--accent); background: var(--accent-bg); }
.ci:not(.sel):hover { border-color: var(--bd); }

.ci-name {
  flex: 1;
  font-size: 11px;
  font-family: var(--fm);
  color: var(--txt);
}
.ci-status {
  font-size: 10px;
  font-family: var(--fm);
  color: var(--txt-m);
  display: flex;
  gap: 4px;
}
.ci-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--bd);
  display: inline-block;
  flex-shrink: 0;
  margin-top: 1px;
}
.ci-dot.ok { background: var(--ok); }

/* ── Computed values display ── */
.kv-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 4px 0;
}
.kv-row + .kv-row { border-top: 1px solid var(--bd-sub); }
.kv-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--txt-m);
  font-family: var(--fm);
}
.kv-value {
  font-size: 11px;
  color: var(--txt-m);
  font-family: var(--fm);
  font-weight: 600;
}
.kv-value.ready { color: var(--ok); }

/* ── Export footer ── */
.xfoot {
  padding: 11px 13px;
  border-top: 1px solid var(--bd-sub);
}

/* ── Canvas area ── */
.ca {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.cv {
  flex: 1;
  display: block;
  cursor: default;
}

.es {
  position: absolute;
  inset: 0;
  bottom: 26px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  pointer-events: none;
}
.es-box {
  width: 52px;
  height: 52px;
  border: 1.5px dashed var(--bd);
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: var(--txt-m);
}
.es-txt {
  color: var(--txt-m);
  font-size: 12px;
  text-align: center;
  line-height: 1.6;
}

.sbar {
  background: var(--bg-side);
  border-top: 1px solid var(--bd-sub);
  padding: 4px 13px;
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 11px;
  color: var(--txt-m);
  font-family: var(--fm);
  flex-shrink: 0;
  height: 26px;
}

.sd {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--txt-m);
  flex-shrink: 0;
}
.sd.a { background: var(--accent); }
.sd.d { background: var(--warn); }

/* ── Modal ── */
.mo {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.75);
  display: grid;
  place-items: center;
  z-index: 100;
}
.mo-box {
  background: var(--bg-panel);
  border: 1px solid var(--bd);
  border-radius: 8px;
  padding: 20px;
  width: 500px;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mo-title { font-size: 14px; font-weight: 600; }
.mo-pre {
  background: var(--bg-input);
  border: 1px solid var(--bd);
  border-radius: var(--r);
  padding: 13px;
  font-family: var(--fm);
  font-size: 12px;
  line-height: 1.65;
  overflow-y: auto;
  height: 50vh;
  max-height: 70vh;
  white-space: pre;
  color: var(--txt);
  resize: none;
  width: 100%;
  outline: none;
}
.mo-acts {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}
.mo-acts .btn { width: auto; padding: 7px 18px; }

/* ── List header row ── */
.list-hd {
  padding: 7px 13px 3px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.list-hd-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--sr-red);
}