/* BatteryLab v0.4 — COMSOL-Desktop-style UI ================================= */
:root{
  --win:#e9edf2; --panel:#ffffff; --ink:#1f2733; --muted:#7b8696;
  --line:#c9d2dd; --line2:#e3e8ef; --accent:#1a6ec8; --accent-d:#125399;
  --sel:#cfe2f7; --sechdr:#eef2f7; --warn:#c87a1a; --green:#1f9d57; --red:#d23c3c;
  --hdr:#f3f6fa;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden}
body{font-family:"Segoe UI","Malgun Gothic",system-ui,sans-serif;font-size:13px;color:var(--ink);
  background:var(--win);
  display:grid;grid-template-rows:auto auto 1fr auto;height:100vh}

/* ---- title bar ---- */
.titlebar{display:flex;align-items:center;gap:8px;padding:5px 12px;
  background:linear-gradient(180deg,#1b3a5c,#14507f);color:#fff;font-size:13px}
.titlebar .logo{font-size:18px}
.titlebar .ver{background:rgba(255,255,255,.2);border-radius:10px;padding:1px 7px;font-size:11px;font-weight:600}
.titlebar .ttl-sub{color:#bcd2e6;font-size:12px;margin-left:6px}
.titlebar .srvstate{margin-left:auto;font-size:11.5px;color:#cfe0ee}
.titlebar .srvstate.ok{color:#9be3b4} .titlebar .srvstate.off{color:#f0b86b}

/* ---- ribbon ---- */
.ribbon{background:var(--hdr);border-bottom:1px solid var(--line)}
.ribtabs{display:flex;gap:2px;padding:3px 8px 0}
.ribtabs button{border:0;background:transparent;padding:6px 16px;font-size:13px;color:var(--ink);
  border-radius:6px 6px 0 0;cursor:pointer}
.ribtabs button:hover{background:#e3eaf3}
.ribtabs button.active{background:#fff;border:1px solid var(--line);border-bottom-color:#fff;font-weight:600;color:var(--accent-d)}
.ribpanel{display:flex;align-items:center;gap:14px;padding:8px 12px;background:#fff;
  border-top:1px solid var(--line);min-height:54px;flex-wrap:wrap}
.ribgrp{display:flex;flex-direction:column;gap:3px;padding:0 12px;border-right:1px solid var(--line2)}
.ribgrp:last-child{border-right:0}
.ribgrp .gl{font-size:10.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.4px}
.ribgrp .gr{display:flex;align-items:center;gap:6px}
.ribgrp label{font-size:11px;color:var(--muted)}
.ribgrp select{padding:4px 6px;border:1px solid var(--line);border-radius:5px;font-size:12.5px;background:#fbfcfe;min-width:150px}
.compute{display:flex;align-items:center;gap:7px;background:linear-gradient(180deg,#2f86e0,#1a6ec8);
  color:#fff;border:0;border-radius:7px;padding:9px 18px;font-size:14px;font-weight:700;cursor:pointer;
  box-shadow:0 2px 6px rgba(26,110,200,.35)}
.compute:hover{filter:brightness(1.07)} .compute .eq{font-size:17px}
.compute:disabled{opacity:.55;cursor:not-allowed}

/* ---- desktop 3-pane ---- */
.desktop{display:grid;grid-template-columns:262px 336px 1fr;gap:6px;padding:6px;min-height:0}
section.mb,section.settings,section.graphics{background:var(--panel);border:1px solid var(--line);
  border-radius:5px;display:flex;flex-direction:column;min-height:0;overflow:hidden}
.panehdr{background:var(--hdr);border-bottom:1px solid var(--line);padding:6px 10px;font-weight:600;font-size:12.5px}
.panehdr .muted{color:var(--muted);font-weight:400;font-size:11px;margin-left:4px}

/* ---- model tree ---- */
.tree{overflow:auto;padding:4px 0;flex:1}
.tnode{user-select:none}
.trow{display:flex;align-items:center;gap:4px;padding:3px 6px;cursor:pointer;white-space:nowrap;font-size:12.5px;border-radius:3px;margin:0 3px}
.trow:hover{background:#eef3f9}
.trow.sel{background:var(--sel);outline:1px solid #9cc3ea}
.trow .tw{width:13px;text-align:center;color:#8a96a6;font-size:10px}
.trow .ic{width:16px;text-align:center}
.trow .lb{overflow:hidden;text-overflow:ellipsis}
.trow .badge{margin-left:6px;font-size:9.5px;background:#e6edf6;color:#5a6b80;border-radius:8px;padding:0 6px}

/* ---- settings ---- */
.setbody{overflow:auto;flex:1;padding:0}
.sec{border-bottom:1px solid var(--line2)}
.sechdr{background:var(--sechdr);padding:5px 11px;font-weight:600;font-size:12px;color:#33425a;
  border-top:1px solid var(--line2);display:flex;align-items:center;gap:6px}
.secbody{padding:7px 11px 11px}
.setdesc{font-size:11.5px;color:var(--muted);padding:9px 11px;line-height:1.5}
.prow{display:grid;grid-template-columns:1fr 116px;gap:8px;align-items:center;margin:6px 0}
.prow label{font-size:12px;color:#3a4658}
.prow .unit{color:#9aa4b2;font-size:10.5px;margin-left:3px}
.prow input[type=number],.prow select,.setbody select.full{width:100%;padding:4px 6px;border:1px solid var(--line);
  border-radius:4px;font-size:12.5px;background:#fbfcfe;color:var(--ink)}
.prow .withslider{grid-column:1 / -1;display:flex;align-items:center;gap:8px}
.prow .withslider input[type=range]{flex:1;accent-color:var(--accent)}
.prow .withslider input[type=number]{width:96px}
.kv{display:flex;justify-content:space-between;font-size:12px;padding:2px 0;color:#3a4658}
.kv b{color:var(--ink)}
.hint{font-size:11px;color:var(--muted);margin:6px 0 0;line-height:1.45}

/* ---- graphics ---- */
.gfxtabs{display:flex;gap:2px;padding:4px 6px 0;background:var(--hdr);border-bottom:1px solid var(--line);flex-wrap:wrap}
.gfxtabs button{border:1px solid transparent;background:transparent;padding:5px 11px;font-size:12px;
  border-radius:5px 5px 0 0;cursor:pointer;color:var(--ink)}
.gfxtabs button:hover{background:#e3eaf3}
.gfxtabs button.active{background:#fff;border-color:var(--line);border-bottom-color:#fff;font-weight:600;color:var(--accent-d)}
.gfxarea{flex:1;min-height:0;padding:6px;overflow:auto;background:#fcfdff;position:relative}
/* ---- settings action bar (always visible Compute) ---- */
.actionbar{display:flex;align-items:center;gap:10px;padding:9px 11px;border-top:1px solid var(--line);
  background:var(--hdr);flex:0 0 auto}
.actionbar .autochk{display:flex;align-items:center;gap:5px;font-size:12px;color:#3a4658;cursor:pointer;white-space:nowrap}
.actionbar .autochk input{accent-color:var(--accent)}
.compute.big{flex:1;justify-content:center;padding:11px 16px;font-size:14.5px}
.compute.stale{animation:pulse 1.1s ease-in-out infinite;background:linear-gradient(180deg,#e0922f,#c87a1a)}
@keyframes pulse{0%,100%{box-shadow:0 2px 6px rgba(200,122,26,.4)}50%{box-shadow:0 0 0 4px rgba(200,122,26,.25)}}
/* ---- server-required banner ---- */
.banner{position:absolute;top:8px;left:8px;right:8px;z-index:5;background:#fff4e2;border:1px solid #e9b466;
  color:#7a4c12;border-radius:6px;padding:10px 14px;font-size:12.5px;display:flex;align-items:center;gap:10px;
  box-shadow:0 3px 10px rgba(120,80,20,.12)}
.banner b{color:#5d3a0d}
.banner button{margin-left:auto;border:1px solid #d79a3e;background:#fff;color:#8a5512;border-radius:5px;
  padding:5px 11px;cursor:pointer;font-size:12px;white-space:nowrap}
.banner button:hover{background:#fde9c8}
.chartgrid{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:1fr 1fr;gap:6px;height:100%}
.chartsingle{height:100%}
.chartbox{background:#fff;border:1px solid var(--line2);border-radius:4px;padding:6px;min-height:0}
.chartbox canvas{width:100%;height:100%;display:block}
.kpibar{display:flex;gap:6px;padding:6px;border-top:1px solid var(--line);background:var(--hdr);overflow-x:auto}
.kpi{background:#fff;border:1px solid var(--line2);border-radius:5px;padding:5px 11px;min-width:96px;text-align:center;flex:0 0 auto}
.kpi .v{font-size:16px;font-weight:800;line-height:1.1}
.kpi .v small{font-size:10.5px;color:var(--muted);font-weight:600}
.kpi .k{font-size:10.5px;color:var(--muted);margin-top:1px}
.kpi.accent .v{color:var(--accent)} .kpi.green .v{color:var(--green)} .kpi.warn .v{color:var(--warn)}

/* ---- messages ---- */
.messages{height:118px;background:var(--panel);border-top:1px solid var(--line);display:flex;flex-direction:column}
.msgtabs{display:flex;gap:2px;padding:3px 6px 0;background:var(--hdr);border-bottom:1px solid var(--line)}
.msgtab{border:1px solid transparent;background:transparent;padding:4px 12px;font-size:12px;cursor:pointer;border-radius:5px 5px 0 0}
.msgtab.active{background:#fff;border-color:var(--line);border-bottom-color:#fff;font-weight:600;color:var(--accent-d)}
.msgbody{flex:1;overflow:auto;padding:6px 12px;font-size:12px;font-family:"Cascadia Mono",Consolas,monospace;line-height:1.55}
.msgbody .line{color:#2b3647} .msgbody .ok{color:var(--green)} .msgbody .err{color:var(--red)} .msgbody .t{color:var(--muted)}
#msg-eq{font-family:inherit}
#msg-eq .eq{padding:4px 0;border-bottom:1px solid var(--line2)}
#msg-eq .eq .name{font-weight:600} #msg-eq .eq .src{color:var(--muted);font-size:11px}
#msg-eq code{background:#f1f4f8;border-radius:4px;padding:1px 5px;font-size:11.5px}

@media (max-width:1100px){ .desktop{grid-template-columns:230px 300px 1fr} }