/* ── Design tokens — Fluent neutral surface system ─────────────────────── */
/* Surfaces are always neutral gray. Only --pri/* and alpha variants change  */
/* per accent color. Backgrounds never carry accent hue.                     */
:root{
  /* Accent — teal (dark-mode adjusted) */
  --pri:#5EC9E2;--on-pri:#002E3D;--pri-con:#00485C;--on-pri-con:#B8EEFF;
  --sec:#5EC9E2;--sec-con:#3A3A3A;--on-sec-con:#EBEBEB;--ter:#7A9ABD;
  /* Neutral dark surfaces — Fluent elevation stack */
  --bg:#141414;
  --surf:#141414;--surf-1:#1E1E1E;--surf-2:#252525;--surf-3:#2D2D2D;
  --surf-var:#383838;--surf-1-rgb:30,30,30;
  --on-surf:#EBEBEB;--on-surf-var:#9A9A9A;
  /* Neutral borders */
  --out:#404040;--out-var:#2A2A2A;
  /* Semantic */
  --err:#FC9090;
  --warn-bg:rgba(255,185,0,.10);--warn-bdr:rgba(255,185,0,.28);--warn-col:#FFB900;
  --info-bg:rgba(94,201,226,.08);--info-bdr:rgba(94,201,226,.22);
  --suc:#2DC470;--suc-bg:rgba(45,196,112,.12);--suc-bdr:rgba(45,196,112,.28);
  /* Alpha */
  --pri-a:rgba(94,201,226,.08);--pri-glow:rgba(94,201,226,.15);--pri-con-a:rgba(0,72,92,.28);
  /* Shape & motion */
  --r-sm:4px;--r-md:6px;--r-lg:8px;--r-xl:12px;--r-full:16px;
  --ease:cubic-bezier(.2,0,0,1);
  --ease-spring:cubic-bezier(.2,0,0,1);
  --shadow-sm:0 1px 2px rgba(0,0,0,.22);
  --shadow-md:0 2px 8px rgba(0,0,0,.28);
  --shadow-lg:0 4px 16px rgba(0,0,0,.34);
}
html{transition:background .25s var(--ease),color .25s var(--ease)}
body{transition:background .25s var(--ease),color .25s var(--ease)}

/* ── Light theme — neutral light surfaces ───────────────────────────────── */
[data-theme="light"]{
  --pri:#0072A0;--on-pri:#FFFFFF;--pri-con:#CCF0FF;--on-pri-con:#002030;
  --sec:#0072A0;--sec-con:#E0E0E0;--on-sec-con:#1A1A1A;--ter:#4A5F90;
  --bg:#F3F3F3;
  --surf:#F3F3F3;--surf-1:#FFFFFF;--surf-2:#F9F9F9;--surf-3:#F0F0F0;
  --surf-var:#E5E5E5;--surf-1-rgb:255,255,255;
  --on-surf:#1A1A1A;--on-surf-var:#5A5A5A;
  --out:#868686;--out-var:#C8C8C8;
  --err:#C42B1C;
  --warn-bg:rgba(157,93,0,.07);--warn-bdr:rgba(157,93,0,.20);--warn-col:#8B5200;
  --info-bg:rgba(0,114,160,.07);--info-bdr:rgba(0,114,160,.18);
  --suc:#107C3C;--suc-bg:rgba(16,124,60,.09);--suc-bdr:rgba(16,124,60,.24);
  --pri-a:rgba(0,114,160,.07);--pri-glow:rgba(0,114,160,.15);--pri-con-a:rgba(204,240,255,.55);
  --shadow-sm:0 1px 2px rgba(0,0,0,.08);
  --shadow-md:0 2px 8px rgba(0,0,0,.10);
  --shadow-lg:0 4px 16px rgba(0,0,0,.12);
}

/* ── Red accent — only accent tokens change, surfaces stay neutral ───────── */
[data-color="red"]{
  --pri:#FC8F8A;--on-pri:#5A0000;--pri-con:#7A0000;--on-pri-con:#FFE0DE;
  --pri-a:rgba(252,143,138,.08);--pri-glow:rgba(252,143,138,.15);--pri-con-a:rgba(122,0,0,.28);
  --info-bg:rgba(252,143,138,.08);--info-bdr:rgba(252,143,138,.22);
}
[data-color="red"][data-theme="light"]{
  --pri:#C42B1C;--on-pri:#FFFFFF;--pri-con:#FFDDDA;--on-pri-con:#3B0000;
  --err:#C42B1C;
  --pri-a:rgba(196,43,28,.07);--pri-glow:rgba(196,43,28,.15);--pri-con-a:rgba(255,221,218,.55);
  --info-bg:rgba(196,43,28,.07);--info-bdr:rgba(196,43,28,.18);
}

/* ── Purple accent — only accent tokens change ──────────────────────────── */
[data-color="purple"]{
  --pri:#C0A8FF;--on-pri:#2E1060;--pri-con:#422B7C;--on-pri-con:#EAE0FF;
  --pri-a:rgba(192,168,255,.08);--pri-glow:rgba(192,168,255,.15);--pri-con-a:rgba(66,43,124,.28);
  --info-bg:rgba(192,168,255,.08);--info-bdr:rgba(192,168,255,.22);
}
[data-color="purple"][data-theme="light"]{
  --pri:#6B4FA0;--on-pri:#FFFFFF;--pri-con:#EADDFF;--on-pri-con:#1A0050;
  --err:#C42B1C;
  --pri-a:rgba(107,79,160,.07);--pri-glow:rgba(107,79,160,.15);--pri-con-a:rgba(234,221,255,.55);
  --info-bg:rgba(107,79,160,.07);--info-bdr:rgba(107,79,160,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Roboto',sans-serif;background:var(--bg);color:var(--on-surf);min-height:100vh}

/* ── App Bar ───────────────────────────────────────────────────────────── */
.app-bar{
  background:rgba(var(--surf-1-rgb),.88);
  backdrop-filter:blur(20px) saturate(1.3);
  -webkit-backdrop-filter:blur(20px) saturate(1.3);
  padding:10px 18px;
  border-bottom:1px solid var(--out-var);
  display:flex;align-items:center;gap:12px;
  position:sticky;top:0;z-index:20;
  box-shadow:var(--shadow-sm);
}
@supports not (backdrop-filter:blur(1px)){
  .app-bar{background:var(--surf-1)}
}
.app-bar-icon{
  width:36px;height:36px;border-radius:var(--r-md);
  background:var(--pri-con);color:var(--on-pri-con);
  display:flex;align-items:center;justify-content:center;
  font-size:18px;flex-shrink:0;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.1);
}
.app-bar h1{font-size:18px;font-weight:500;letter-spacing:.15px;line-height:1.2}
.app-bar-sub{font-size:10.5px;color:var(--on-surf-var);margin-top:1px;letter-spacing:.2px}
.bar-end{display:flex;align-items:center;gap:9px;margin-left:auto;flex-shrink:0}
.lang-seg{
  display:flex;border-radius:var(--r-md);overflow:hidden;
  border:1.5px solid var(--out);flex-shrink:0;
}
.lang-b{
  padding:5px 12px;font-size:11px;font-weight:700;
  background:transparent;border:none;border-right:1.5px solid var(--out);
  color:var(--on-surf-var);cursor:pointer;font-family:'Roboto',sans-serif;
  transition:background .2s var(--ease),color .2s var(--ease);letter-spacing:.5px;
}
.lang-b:last-child{border-right:none}
.lang-b.active{background:var(--pri);color:var(--on-pri)}
.lang-b:hover:not(.active){background:var(--pri-a);color:var(--pri)}

/* Material You Select */
.mu-select-wrapper{
  position:relative;display:inline-flex;align-items:center;
  background:var(--surf-var);border-radius:var(--r-md);
  padding:2px 2px 2px 8px;border:1px solid var(--out);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.mu-select-wrapper:hover{border-color:var(--pri)}
.mu-select-wrapper:focus-within{
  border-color:var(--pri);
  box-shadow:0 0 0 2px var(--pri-glow);
}
.mu-select{
  padding:6px 8px 6px 0;font-size:13px;font-weight:500;
  background:transparent;border:none;color:var(--on-surf-var);
  cursor:pointer;font-family:'Roboto',sans-serif;outline:none;
  -webkit-appearance:none;-moz-appearance:none;appearance:none;
  min-width:40px;text-align:left;
}
.mu-select option{background:var(--surf-1);color:var(--on-surf)}
.mu-select-arrow{position:absolute;right:8px;pointer-events:none;font-size:10px;color:var(--on-surf-var)}

/* Material You Switch */
.reset-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;background:var(--surf-var);
  border:1px solid var(--out);border-radius:var(--r-md);
  color:var(--on-surf-var);font-size:17px;cursor:pointer;
  transition:all .2s var(--ease);flex-shrink:0;line-height:1;
}
.reset-btn:hover{border-color:var(--pri);color:var(--pri);background:var(--pri-a)}
.reset-btn:active{transform:scale(.88) rotate(-180deg);transition-duration:.15s}
.links-wrap{position:relative}
.links-btn{font-size:15px}
.links-btn:active{transform:scale(.88);transition-duration:.15s}
.links-panel{
  position:absolute;right:0;top:calc(100% + 8px);z-index:200;
  background:var(--surf-1);border:1px solid var(--out-var);border-radius:var(--r-md);
  padding:6px;min-width:230px;display:none;
  box-shadow:var(--shadow-md);
}
.links-panel.open{display:block}
.links-panel-hdr{
  font-size:10.5px;font-weight:700;color:var(--on-surf-var);
  padding:4px 8px 6px;letter-spacing:.6px;text-transform:uppercase;
  border-bottom:1px solid var(--out-var);margin-bottom:4px;
}
.links-panel a{
  display:block;padding:6px 8px;border-radius:var(--r-sm);
  color:var(--on-surf);font-size:13px;text-decoration:none;
  transition:background .15s var(--ease),color .15s var(--ease);
}
.links-panel a:hover{background:var(--pri-a);color:var(--pri)}
.mu-switch{display:inline-flex;align-items:center;cursor:pointer;user-select:none;margin-left:6px}
.mu-switch input{position:absolute;opacity:0;width:0;height:0}
.mu-switch-track{
  position:relative;width:52px;height:30px;border-radius:16px;
  background:var(--surf-var);border:1px solid var(--out);
  transition:background .25s var(--ease),border-color .25s var(--ease);
  overflow:hidden;
}
.mu-switch input:checked+.mu-switch-track{background:var(--pri-con);border-color:var(--pri)}
.mu-switch-thumb{
  position:absolute;top:2px;left:2px;width:26px;height:26px;
  border-radius:50%;background:var(--surf-1);
  transition:transform .2s var(--ease),background .2s var(--ease);
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-sm);
}
.mu-switch input:checked+.mu-switch-track .mu-switch-thumb{
  transform:translateX(22px);background:var(--on-pri);
}
.mu-switch-thumb::before{
  content:'';display:block;width:10px;height:10px;border-radius:50%;
  background:var(--on-surf-var);
}
.mu-switch input:checked+.mu-switch-track .mu-switch-thumb::before{
  background:var(--pri);
}

/* ── Tab Bar ───────────────────────────────────────────────────────────── */
.tab-bar{
  display:flex;background:var(--surf-1);
  border-bottom:1px solid var(--out-var);
  position:sticky;top:55px;z-index:9;
}
.tab{
  flex:1;padding:12px 6px;text-align:center;
  font-size:13px;font-weight:500;font-family:'Roboto',sans-serif;
  color:var(--on-surf-var);cursor:pointer;border:none;
  border-bottom:3px solid transparent;background:transparent;
  letter-spacing:.2px;transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.tab.active{color:var(--pri);border-bottom-color:var(--pri)}
.tab:hover:not(.active){color:var(--on-surf)}

/* ── Layout ────────────────────────────────────────────────────────────── */
.content{max-width:710px;margin:0 auto;padding:18px 14px 60px}
.tab-pane{display:none}.tab-pane.active{display:block}

/* ── Cards ─────────────────────────────────────────────────────────────── */
.card{
  background:var(--surf-1);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:16px;margin-bottom:12px;
  transition:border-color .2s var(--ease);
}
.card-hdr{
  font-size:10.5px;font-weight:700;color:var(--pri);
  text-transform:uppercase;letter-spacing:1.4px;margin-bottom:16px;
}

/* ── Segmented Buttons ─────────────────────────────────────────────────── */
.seg-group{
  display:flex;border-radius:var(--r-md);overflow:hidden;
  border:1.5px solid var(--out);margin-bottom:16px;
}
.seg-btn{
  flex:1;padding:9px 8px;font-size:13px;font-weight:500;
  background:transparent;border:none;border-right:1.5px solid var(--out);
  color:var(--on-surf-var);cursor:pointer;font-family:'Roboto',sans-serif;
  transition:background .2s var(--ease),color .2s var(--ease);
}
.seg-btn:last-child{border-right:none}
.seg-btn.active{
  background:var(--sec-con);color:var(--on-sec-con);font-weight:600;
}
.seg-btn:hover:not(.active){background:var(--pri-a);color:var(--pri)}

/* ── Form Fields ───────────────────────────────────────────────────────── */
.row{display:grid;gap:10px;margin-bottom:10px}
.row.c2{grid-template-columns:1fr 1fr}.row.c3{grid-template-columns:1fr 1fr 1fr}
.row>*{min-width:0}
.fld{display:flex;flex-direction:column;gap:4px;min-width:0}
.fld>label{font-size:10px;font-weight:700;color:var(--pri);letter-spacing:.8px;text-transform:uppercase}
.fld-inner{
  display:flex;align-items:center;border:1.5px solid var(--out);
  border-radius:var(--r-md);background:var(--surf-2);overflow:hidden;
  transition:border-color .15s var(--ease),background .15s var(--ease),box-shadow .15s var(--ease);
}
.fld-inner:focus-within{
  border-color:var(--pri);background:var(--surf-3);
  box-shadow:0 0 0 3px var(--pri-glow);
}
.fld-inner input,.fld-inner select{
  flex:1;padding:10px 13px;font-size:14px;font-family:'Roboto',sans-serif;
  border:none;outline:none;background:transparent;color:var(--on-surf);min-width:0;
}
.fld-inner select{cursor:pointer;color:var(--on-surf-var);padding-right:6px}
.fld-unit{padding:0 12px 0 2px;font-size:12px;color:var(--on-surf-var);white-space:nowrap;font-weight:500}
.fld-hint{font-size:10px;color:var(--pri);margin-top:2px;padding-left:2px;font-family:'Roboto Mono',monospace;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;opacity:.85}
.fld-note{font-size:11px;color:var(--on-surf-var);margin-top:3px;padding-left:2px;line-height:1.5;font-family:'Roboto',sans-serif;opacity:.85}
.len-row{display:grid;grid-template-columns:1.65fr 1fr;gap:10px;margin-bottom:10px}
.len-inner{
  display:grid;grid-template-columns:1fr 62px 95px;
  border:1.5px solid var(--out);border-radius:var(--r-md);
  overflow:hidden;background:var(--surf-2);
  transition:border-color .15s var(--ease),background .15s var(--ease),box-shadow .15s var(--ease);
}
.len-inner:focus-within{
  border-color:var(--pri);background:var(--surf-3);
  box-shadow:0 0 0 3px var(--pri-glow);
}
.len-inner input{padding:10px 12px;font-size:14px;font-family:'Roboto',sans-serif;border:none;outline:none;background:transparent;color:var(--on-surf)}
.len-inner select{padding:10px 7px;font-size:12.5px;font-family:'Roboto',sans-serif;border:none;border-left:1px solid var(--out-var);outline:none;background:transparent;color:var(--on-surf-var);cursor:pointer}

/* ── Alerts ────────────────────────────────────────────────────────────── */
.warn-area{margin-bottom:8px}
.warn-chip{
  display:flex;align-items:flex-start;gap:8px;
  background:var(--warn-bg);border:1px solid var(--warn-bdr);
  border-left:3px solid var(--warn-col);
  border-radius:var(--r-md);padding:8px 13px;
  font-size:12px;color:var(--warn-col);margin-bottom:5px;line-height:1.5;
}
.warn-chip.info{background:var(--info-bg);border-color:var(--info-bdr);border-left-color:var(--pri);color:var(--pri)}

/* ── Primary Button ────────────────────────────────────────────────────── */
.btn-primary{
  width:100%;padding:14px 20px;
  background:var(--pri);
  color:var(--on-pri);border:none;border-radius:var(--r-md);
  font-size:15px;font-weight:600;font-family:'Roboto',sans-serif;
  cursor:pointer;letter-spacing:.4px;
  transition:filter .15s var(--ease),box-shadow .15s var(--ease);
  margin-top:4px;
}
.btn-primary:hover{
  filter:brightness(1.08);
}
.btn-primary:active{filter:brightness(.95)}
.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none;filter:none}
/* Required-field highlight (fuse I²t) */
.input-required{border-color:var(--err)!important;box-shadow:0 0 0 2px rgba(200,0,0,.18)!important}
.input-required::placeholder{color:var(--err);opacity:.75}
.err-box{
  background:rgba(147,0,10,.25);color:var(--err);
  border:1px solid rgba(255,180,171,.3);border-radius:var(--r-md);
  padding:10px 15px;font-size:13px;margin-top:8px;display:none;
}

/* ── Results Cards ─────────────────────────────────────────────────────── */
.res-card{
  background:var(--surf-2);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:16px;margin-top:12px;
  display:none;box-shadow:var(--shadow-sm);
}
.res-lbl{font-size:10px;font-weight:700;color:var(--pri);text-transform:uppercase;letter-spacing:1.4px;opacity:.8;margin-bottom:10px}
.con-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}
.con-card{
  background:var(--surf-3);border:1.5px solid var(--out-var);
  border-radius:var(--r-lg);padding:14px;position:relative;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.con-card.lim{border-color:var(--pri);background:var(--pri-con-a);box-shadow:0 0 12px var(--pri-glow)}
.con-badge{
  display:none;position:absolute;top:9px;right:9px;
  background:var(--pri);color:var(--on-pri);
  font-size:9px;font-weight:700;padding:2px 8px;
  border-radius:var(--r-sm);letter-spacing:.5px;
}
.con-card.lim .con-badge{display:inline-block}
.c-type{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;color:var(--on-surf-var);margin-bottom:5px}
.c-fml{font-size:9.5px;color:var(--on-surf-var);opacity:.5;margin-bottom:8px;font-family:'Roboto Mono',monospace;line-height:1.45}
.c-val{font-size:22px;font-weight:700;color:var(--pri);font-family:'Roboto Mono',monospace;line-height:1}
.c-sub{font-size:11px;color:var(--on-surf-var);margin-top:4px}
.c-std{margin-top:9px;padding-top:9px;border-top:1px solid var(--out-var)}
.c-std-v{font-size:14px;font-weight:600;color:var(--on-pri-con);font-family:'Roboto Mono',monospace}
.c-std-s{font-size:10.5px;color:var(--on-surf-var);margin-top:2px}
.rec-box{
  background:var(--pri-con);border-radius:var(--r-lg);
  padding:16px 18px;display:flex;align-items:center;gap:14px;margin-bottom:10px;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.07);
}
.rec-main{font-size:22px;font-weight:700;color:var(--on-pri-con);font-family:'Roboto Mono',monospace}
.rec-sub{font-size:11px;color:var(--on-pri-con);opacity:.7;margin-top:3px}
.rec-tags{display:flex;gap:7px;margin-top:8px;flex-wrap:wrap}
.rec-tag{
  background:rgba(255,255,255,.15);border-radius:var(--r-sm);
  padding:3px 10px;font-size:11px;color:var(--on-pri-con);font-weight:500;
}
.rec-tag.hi{background:rgba(255,255,255,.28);font-weight:700}
.rec-pe{margin-top:8px;display:flex;align-items:center;flex-wrap:wrap;gap:7px}
.rec-pe-badge{
  background:var(--suc-bg);border:1px solid var(--suc-bdr);
  color:var(--suc);border-radius:var(--r-sm);padding:3px 10px;
  font-size:11px;font-weight:700;letter-spacing:.3px;white-space:nowrap;
}
.rec-pe-val{font-size:13px;font-weight:600;color:var(--on-pri-con);font-family:'Roboto Mono',monospace}
.rec-pe-method{margin-top:4px;display:flex;align-items:center;flex-wrap:wrap;gap:6px;font-size:11.5px}
.rec-pe-label{color:var(--on-pri-con);opacity:.8;font-weight:500;white-space:nowrap}
.rec-pe-adiabatic{font-weight:700;color:rgba(200,255,200,.9);font-family:'Roboto Mono',monospace}
.rec-pe-note{color:var(--on-pri-con);opacity:.6;font-size:10.5px;font-family:'Roboto Mono',monospace;font-weight:400}
.divider{height:1px;background:var(--out-var);margin:12px 0}
.vd-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.vd-item{
  background:var(--surf-3);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:12px;
}
.vd-lbl{font-size:10px;font-weight:700;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:.7px;margin-bottom:5px}
.vd-val{font-size:20px;font-weight:700;font-family:'Roboto Mono',monospace}
.vd-sub{font-size:11px;color:var(--on-surf-var);margin-top:3px}
.vd-item.allowed .vd-val{color:var(--sec)}
.vd-item.actual .vd-val{color:var(--ter)}
.note-bar{
  margin-top:12px;background:var(--surf-var);border-radius:var(--r-md);
  padding:9px 13px;font-size:11.5px;color:var(--on-surf-var);
  line-height:1.7;border-left:3px solid var(--pri-con);
}

/* ── What-If Slider ────────────────────────────────────────────────────── */
.wi-card{
  background:var(--surf-2);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:16px;margin-top:12px;display:none;
}
.wi-hdr{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.wi-title{font-size:10.5px;font-weight:700;color:var(--pri);text-transform:uppercase;letter-spacing:1.2px}
.wi-cur{font-size:13px;font-weight:600;color:var(--on-surf);font-family:'Roboto Mono',monospace}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:5px;background:var(--out-var);border-radius:3px;outline:none;cursor:pointer}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--pri);cursor:pointer;box-shadow:0 0 0 3px var(--pri-glow);transition:box-shadow .15s}
input[type=range]:hover::-webkit-slider-thumb{box-shadow:0 0 0 5px var(--pri-glow)}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--pri);border:none;cursor:pointer}
.wi-row{display:flex;gap:10px;margin-top:10px;flex-wrap:wrap}
.wi-item{flex:1;min-width:80px;background:var(--surf-3);border-radius:var(--r-md);padding:10px 12px}
.wi-lbl{font-size:9.5px;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:.6px;margin-bottom:4px}
.wi-val{font-size:15px;font-weight:700;color:var(--pri);font-family:'Roboto Mono',monospace}

/* ── Converter ─────────────────────────────────────────────────────────── */
.conv-dir-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.conv-dir-lbl{
  font-size:14px;font-weight:500;flex:1;text-align:center;
  background:var(--surf-2);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:9px;
}
.swap-btn{
  background:var(--sec-con);color:var(--on-sec-con);border:none;
  border-radius:50%;width:42px;height:42px;font-size:21px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:background .2s var(--ease),color .2s var(--ease),transform .25s var(--ease),box-shadow .2s var(--ease);
  flex-shrink:0;box-shadow:var(--shadow-sm);
}
.swap-btn:hover{background:var(--pri);color:var(--on-pri);transform:rotate(180deg)}
.swap-btn:active{transform:rotate(180deg) scale(.93)}
.conv-res{display:none;grid-template-columns:1fr 1fr 1fr;gap:10px;margin-top:14px}
.conv-res-item{
  background:var(--surf-2);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:14px;text-align:center;
  transition:border-color .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease);
}
.conv-res-item.hl{border-color:var(--pri);background:var(--pri-a);box-shadow:0 0 12px var(--pri-glow)}
.conv-res-lbl{font-size:10px;font-weight:700;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:.9px;margin-bottom:8px}
.conv-res-val{font-size:17px;font-weight:700;color:var(--pri);font-family:'Roboto Mono',monospace;word-break:break-all}
.conv-res-sub{font-size:10.5px;color:var(--on-surf-var);margin-top:4px}
.badge{
  display:inline-block;background:var(--pri-con);color:var(--on-pri-con);
  font-size:9.5px;font-weight:700;padding:2px 8px;
  border-radius:var(--r-sm);letter-spacing:.5px;margin-top:6px;
}
.badge.sec{background:var(--sec-con);color:var(--on-sec-con)}
.note-sm{margin-top:10px;background:var(--surf-var);border-radius:var(--r-md);padding:8px 13px;font-size:11px;color:var(--on-surf-var);line-height:1.5;display:none}

/* ── Reference Table ───────────────────────────────────────────────────── */
.ref-tbl-wrap{margin-top:16px}
.ref-tbl-hdr{font-size:10px;font-weight:700;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:.9px;margin-bottom:8px;opacity:.7}
.ref-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ref-tbl{width:100%;border-collapse:collapse;font-size:11.5px}
.ref-tbl th{background:var(--surf-3);color:var(--pri);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;padding:7px 10px;text-align:left;border-bottom:2px solid var(--out-var)}
.ref-tbl td{padding:5px 10px;border-bottom:1px solid var(--out-var);font-family:'Roboto Mono',monospace;color:var(--on-surf);font-size:11.5px}
.ref-tbl tbody tr:hover td{background:var(--surf-var)}
.ref-tbl td.dim{color:var(--on-surf-var);font-size:10.5px}
.ref-tbl-card{background:var(--surf-1);border:1px solid var(--out-var);border-radius:var(--r-lg);overflow:hidden}

/* ── Tooltip ───────────────────────────────────────────────────────────── */
.tt{
  display:inline-flex;align-items:center;justify-content:center;
  width:15px;height:15px;border-radius:50%;
  background:var(--surf-var);border:1px solid var(--out);
  color:var(--on-surf-var);font-size:9px;font-weight:700;
  cursor:help;position:relative;margin-left:5px;vertical-align:middle;
  font-style:normal;flex-shrink:0;user-select:none;font-family:'Roboto',sans-serif;
  letter-spacing:0;text-transform:none;
  transition:background .15s var(--ease),border-color .15s var(--ease),color .15s var(--ease);
  line-height:1;
}
.tt:hover,.tt:focus{background:var(--pri-con);border-color:var(--pri);color:var(--on-pri-con);outline:none}
.tt::before{
  content:'';position:absolute;bottom:calc(100% + 3px);left:50%;
  transform:translateX(-50%);border:4px solid transparent;
  border-top-color:var(--out);pointer-events:none;opacity:0;
  transition:opacity .15s var(--ease);z-index:61;
}
.tt::after{
  content:attr(data-tip);position:absolute;bottom:calc(100% + 11px);left:50%;
  transform:translateX(-50%);background:var(--surf-3);color:var(--on-surf);
  border:1px solid var(--out);border-radius:var(--r-sm);padding:9px 12px;
  font-size:11.5px;font-weight:400;font-family:'Roboto',sans-serif;
  letter-spacing:normal;text-transform:none;white-space:normal;line-height:1.5;
  width:230px;box-shadow:var(--shadow-md);z-index:60;
  pointer-events:none;opacity:0;transition:opacity .15s var(--ease);
}
.tt:hover::before,.tt:focus::before{opacity:1}
.tt:hover::after,.tt:focus::after{opacity:1}

/* ── Toast ─────────────────────────────────────────────────────────────── */
#toast{
  position:fixed;bottom:22px;left:50%;transform:translateX(-50%);
  background:var(--surf-var);color:var(--on-surf);
  padding:9px 20px;border-radius:var(--r-md);font-size:13px;
  z-index:100;box-shadow:var(--shadow-md);
  border:1px solid var(--out);
  pointer-events:none;opacity:0;transition:opacity .3s var(--ease);
}
option{background:var(--surf-2);color:var(--on-surf)}
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--out);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--on-surf-var)}

/* ── Switchboard ───────────────────────────────────────────────────────── */
.sb-section-hdr{font-size:10.5px;font-weight:700;color:var(--pri);text-transform:uppercase;letter-spacing:1.4px;margin-bottom:12px}
.sb-mode-row{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.sb-mode-row label{font-size:10px;font-weight:700;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:.6px}
.sb-tbl-wrap{overflow-x:auto;margin-bottom:8px}
.sb-tbl{width:100%;border-collapse:collapse;font-size:12.5px}
.sb-tbl th{background:var(--surf-3);color:var(--pri);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.8px;padding:8px 9px;text-align:left;border-bottom:2px solid var(--out-var);white-space:nowrap}
.sb-tbl td{padding:6px 9px;border-bottom:1px solid var(--out-var);vertical-align:middle}
.sb-tbl tbody tr:last-child td{border-bottom:none}
.sb-tbl input,.sb-tbl select{
  background:var(--surf-2);border:1.5px solid var(--out);border-radius:var(--r-sm);
  color:var(--on-surf);font-family:'Roboto',sans-serif;font-size:12.5px;
  padding:5px 8px;width:100%;min-width:60px;outline:none;
  transition:border-color .15s var(--ease);
}
.sb-tbl input:focus,.sb-tbl select:focus{border-color:var(--pri)}
.sb-tbl .mm2-hint{font-size:10px;color:var(--on-surf-var);margin-top:3px;font-family:'Roboto Mono',monospace;white-space:nowrap}
.sb-del-btn{
  background:rgba(255,180,171,.12);border:1px solid rgba(255,180,171,.25);color:var(--err);
  border-radius:var(--r-sm);padding:4px 8px;font-size:12px;cursor:pointer;
  transition:background .2s var(--ease);white-space:nowrap;display:block;width:100%;
}
.sb-del-btn:hover{background:rgba(255,180,171,.28)}
.sb-label-input{
  margin-top:4px;width:100%;background:var(--surf-2);border:1.5px solid var(--out);
  border-radius:var(--r-sm);color:var(--on-surf-var);font-family:'Roboto',sans-serif;
  font-size:11px;padding:4px 8px;outline:none;transition:border-color .15s var(--ease);
}
.sb-label-input:focus{border-color:var(--pri);color:var(--on-surf)}
.sb-label-input::placeholder{color:var(--on-surf-var);opacity:.45}
.sb-dim-row{margin-bottom:8px}
.sb-add-btn{
  background:transparent;border:1.5px dashed var(--out);color:var(--on-surf-var);
  border-radius:var(--r-md);padding:8px 16px;font-size:12.5px;
  font-family:'Roboto',sans-serif;cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease),transform .15s var(--ease);
  margin-bottom:6px;
}
.sb-add-btn:hover{border-color:var(--pri);color:var(--pri);background:var(--pri-a);transform:translateY(-1px)}
.sb-add-btn:active{transform:translateY(0)}
.sb-subtotal{
  font-size:11.5px;font-weight:600;color:var(--on-surf-var);
  text-align:right;padding:6px 10px;background:var(--surf-3);
  border-radius:var(--r-sm);margin-bottom:12px;font-family:'Roboto Mono',monospace;
}
.sb-subtotal span{color:var(--pri)}
.sb-suggest-btn{
  background:var(--sec-con);color:var(--on-sec-con);border:none;
  border-radius:var(--r-sm);padding:4px 8px;font-size:11px;
  font-family:'Roboto',sans-serif;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),transform .15s var(--ease);
  white-space:nowrap;
}
.sb-suggest-btn:hover{background:var(--pri);color:var(--on-pri);transform:translateY(-1px)}
.sb-suggest-btn:active{transform:translateY(0)}
.sb-enc-tabs{display:flex;border-radius:var(--r-md);overflow:hidden;border:1.5px solid var(--out);margin-bottom:14px;width:fit-content}
.sb-enc-tab{padding:7px 18px;font-size:12.5px;font-weight:500;background:transparent;border:none;border-right:1.5px solid var(--out);color:var(--on-surf-var);cursor:pointer;font-family:'Roboto',sans-serif;transition:background .2s var(--ease),color .2s var(--ease)}
.sb-enc-tab:last-child{border-right:none}
.sb-enc-tab.active{background:var(--sec-con);color:var(--on-sec-con);font-weight:600}
.sb-ae-display{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-md);padding:9px 14px;font-size:12px;color:var(--on-surf-var);margin-top:8px;font-family:'Roboto Mono',monospace}
.sb-ae-display span{color:var(--pri);font-weight:600}
.collapsible-hdr{display:flex;align-items:center;justify-content:space-between;cursor:pointer;padding:10px 0;user-select:none}
.collapsible-hdr .sb-section-hdr{margin-bottom:0}
.collapsible-arrow{color:var(--on-surf-var);font-size:14px;transition:transform .25s var(--ease)}
.collapsible-arrow.open{transform:rotate(180deg)}
.collapsible-body{overflow:hidden;transition:max-height .3s var(--ease)}
.sb-vent-group{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-md);padding:12px;margin-bottom:10px}
.sb-vent-toggle{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.sb-vent-toggle label{font-size:12.5px;font-weight:500;cursor:pointer}
.sb-vent-fields{display:grid;gap:10px}
.sb-res-card{
  background:var(--surf-2);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:16px;margin-top:12px;
  display:none;box-shadow:var(--shadow-sm);
}
.sb-res-box{background:var(--surf-3);border:2px solid var(--pri-con);border-radius:var(--r-lg);padding:16px;margin-bottom:14px}
.sb-res-row{display:flex;justify-content:space-between;align-items:center;padding:5px 0;border-bottom:1px solid var(--out-var);font-size:13px}
.sb-res-row:last-child{border-bottom:none}
.sb-res-label{color:var(--on-surf-var);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.6px}
.sb-res-value{font-family:'Roboto Mono',monospace;font-weight:700;color:var(--pri);font-size:15px}
.sb-status-badge{display:inline-block;border-radius:var(--r-sm);padding:4px 14px;font-size:12px;font-weight:700;letter-spacing:.4px}
.sb-status-badge.green{background:var(--suc-bg);color:var(--suc);border:1px solid var(--suc-bdr)}
.sb-status-badge.yellow{background:rgba(255,208,128,.12);color:var(--warn-col);border:1px solid var(--warn-bdr)}
.sb-status-badge.red{background:rgba(255,100,100,.15);color:#ff6464;border:1px solid rgba(255,100,100,.35)}
.sb-status-hot{background:rgba(255,165,0,.12);color:#ffaa00;border:1px solid rgba(255,165,0,.35);border-radius:var(--r-md);padding:7px 12px;font-size:12px;margin-top:8px;display:none}
.sb-steps{
  font-size:12px;color:var(--on-surf-var);line-height:1.8;font-family:'Roboto Mono',monospace;
  background:var(--surf-3);border-radius:var(--r-lg);padding:14px;margin-bottom:14px;
  white-space:pre-wrap;overflow-x:auto;
}
.sb-steps .step-block{margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid var(--out-var)}
.sb-steps .step-block:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.sb-steps .step-result{color:var(--pri);font-weight:700}
.sb-file-input{font-size:12px;color:var(--on-surf);background:var(--surf-2);border:1.5px solid var(--out);border-radius:var(--r-sm);padding:5px 8px;width:100%;cursor:pointer}
.sb-file-input::-webkit-file-upload-button{background:var(--sec-con);color:var(--on-sec-con);border:none;border-radius:var(--r-sm);padding:3px 8px;font-size:11px;font-family:'Roboto',sans-serif;cursor:pointer;margin-right:8px}

/* ── Short-circuit ─────────────────────────────────────────────────────── */
.sc-res-card{
  background:var(--surf-2);border:1px solid var(--out-var);
  border-radius:var(--r-lg);padding:16px;margin-top:12px;
  display:none;box-shadow:var(--shadow-sm);
}
.sc-res-sub-lbl{font-size:10px;font-weight:700;color:var(--pri);text-transform:uppercase;letter-spacing:1.2px;opacity:.8;margin-bottom:8px}
.sc-imp-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:4px}
.sc-imp-item{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-md);padding:10px 12px}
.sc-imp-lbl{font-size:10px;font-weight:600;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px}
.sc-imp-val{font-size:13px;font-weight:700;color:var(--pri);font-family:'Roboto Mono',monospace}
.sc-ik-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:10px}
.sc-ik-card{
  background:var(--surf-3);border:1.5px solid var(--out-var);
  border-radius:var(--r-lg);padding:14px;text-align:center;
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.sc-ik-card-hl{border-color:var(--pri)!important;background:var(--pri-con-a)!important;box-shadow:0 0 10px var(--pri-glow)}
.sc-ik-type{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;color:var(--on-surf-var);margin-bottom:8px}
.sc-ik-val{font-size:22px;font-weight:700;color:var(--pri);font-family:'Roboto Mono',monospace}
.sc-ik-sub{font-size:10.5px;color:var(--on-surf-var);margin-top:5px}
.sc-trip-box{border-radius:var(--r-lg);padding:14px 18px;margin-bottom:10px}
.sc-trip-ok{background:var(--suc-bg);border:1.5px solid var(--suc-bdr)}
.sc-trip-fail{background:rgba(255,100,100,.1);border:1.5px solid rgba(255,100,100,.35)}
.sc-trip-status{font-size:15px;font-weight:700;margin-bottom:5px}
.sc-trip-ok .sc-trip-status{color:var(--suc)}
.sc-trip-fail .sc-trip-status{color:#ff6464}
.sc-trip-detail{font-size:12px;color:var(--on-surf-var);font-family:'Roboto Mono',monospace}
.sc-icu-box{background:rgba(255,100,100,.12);border:1.5px solid rgba(255,100,100,.35);color:#ff6464;border-radius:var(--r-md);padding:10px 14px;font-size:12.5px;margin-bottom:2px}
.sc-maxlen-box{background:var(--surf-3);border:1.5px solid var(--out-var);border-radius:var(--r-md);padding:11px 14px;font-family:'Roboto Mono',monospace;font-size:15px;font-weight:700}
.sc-maxlen-ok{color:var(--suc);border-color:var(--suc-bdr)!important}
.sc-maxlen-warn{color:var(--warn-col);border-color:var(--warn-bdr)!important}
.sc-computed-row{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-md);padding:9px 14px;font-size:12px;color:var(--on-surf-var);margin-top:8px;font-family:'Roboto Mono',monospace}
.sc-computed-row span:last-child{color:var(--pri);font-weight:600}
.sc-zs-display{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-md);padding:9px 14px;font-size:12px;color:var(--on-surf-var);margin-top:10px;font-family:'Roboto Mono',monospace}
.sc-zs-display span:last-child{color:var(--pri);font-weight:600}
.sc-import-btn{
  background:transparent;border:1.5px dashed var(--pri-con);color:var(--pri);
  border-radius:var(--r-md);padding:8px 16px;font-size:12.5px;
  font-family:'Roboto',sans-serif;cursor:pointer;
  transition:background .2s var(--ease),border-style .2s,transform .15s var(--ease);
  margin-top:8px;display:block;width:100%;text-align:center;
}
.sc-import-btn:hover{background:var(--pri-con);border-style:solid;transform:translateY(-1px)}
.sc-import-btn:active{transform:translateY(0)}
.sc-temp-note{white-space:normal;overflow:visible;text-overflow:unset;line-height:1.5}
.sc-ik-range{display:flex;flex-direction:column;align-items:center;gap:1px}
.sc-ik-range-max{font-size:15px;font-weight:700;color:var(--pri)}
.sc-ik-range-min{font-size:12px;font-weight:600;color:var(--on-surf-var)}
.sc-ik-range-sep{font-size:10px;color:var(--on-surf-var);opacity:.6}
.sc-trip-partial{background:rgba(200,140,0,.12);border:1px solid rgba(200,140,0,.4)}
.sc-trip-partial .sc-trip-status{color:#c88c00}
/* ── Cable Thermal Withstand card (IEC 60364-4-43 §434.5) ───────────────── */
.sc-trip-pair{display:flex;gap:10px;align-items:stretch}
.sc-trip-col{flex:1;min-width:0;display:flex;flex-direction:column}
.sc-trip-col .sc-trip-box{margin-bottom:0;flex:1}
.sc-thw-card{border-radius:var(--r-lg);padding:14px 18px;flex:1;display:flex;flex-direction:column}
.sc-thw-pass{background:var(--suc-bg);border:1.5px solid var(--suc-bdr)}
.sc-thw-warn{background:rgba(200,140,0,.12);border:1px solid rgba(200,140,0,.4)}
.sc-thw-fail{background:rgba(255,100,100,.1);border:1.5px solid rgba(255,100,100,.35)}
.sc-thw-title{font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.7px;opacity:.7;margin-bottom:9px;color:var(--on-surf-var)}
.sc-thw-rows{display:flex;flex-direction:column;gap:5px;flex:1}
.sc-thw-item{display:flex;justify-content:space-between;align-items:baseline;gap:6px}
.sc-thw-lbl{font-size:11px;color:var(--on-surf-var);white-space:nowrap;flex-shrink:0}
.sc-thw-val{font-size:11.5px;font-weight:700;font-family:'Roboto Mono',monospace;color:var(--on-surf);text-align:right}
.sc-thw-badge{font-size:13px;font-weight:700;text-align:center;padding:7px 0 2px;margin-top:8px}
.sc-thw-pass .sc-thw-badge{color:var(--suc)}
.sc-thw-warn .sc-thw-badge{color:#c88c00}
.sc-thw-fail .sc-thw-badge{color:#ff6464}
/* ── IEC 60364-4-41 §411.4.4 Disconnection Time Verification card ─────── */
.sc-dtv-card{border-radius:var(--r-lg);padding:14px 18px;margin-top:10px}
.sc-dtv-hdr{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:9px}
.sc-dtv-tmax-row{display:flex;align-items:center;gap:6px}
.sc-dtv-sel{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-sm);color:var(--on-surf);font-size:11.5px;padding:3px 6px;font-family:'Roboto Mono',monospace;cursor:pointer}
.sc-dtv-rows{margin-bottom:0}
.sc-dtv-pass{background:var(--suc-bg);border:1.5px solid var(--suc-bdr)}
.sc-dtv-pass .sc-thw-badge{color:var(--suc)}
.sc-dtv-fail{background:rgba(255,100,100,.1);border:1.5px solid rgba(255,100,100,.35)}
.sc-dtv-fail .sc-thw-badge{color:#ff6464}
.sc-icu-warn{background:rgba(200,100,0,.12);border:1px solid rgba(200,100,0,.4);color:#b86000;border-radius:6px;padding:8px 12px;font-size:12.5px;margin-top:6px}
.sc-assumptions{background:var(--surf-2);border:1px solid var(--surf-3);border-radius:6px;padding:10px 12px;font-size:11px;color:var(--on-surf-var);font-family:monospace;white-space:pre-wrap;line-height:1.6;margin:0}

/* ── Selectivity Analysis ──────────────────────────────────────────────── */
.sc-sel-check-row{display:flex;align-items:center;gap:10px}
.sc-sel-check-row input[type="checkbox"]{width:17px;height:17px;accent-color:var(--pri);cursor:pointer;margin:0;flex-shrink:0}
.sc-sel-check-row label{font-size:13px;font-weight:500;color:var(--on-surf);cursor:pointer;margin:0}
.sc-sel-ascii{background:var(--surf-2);border:1px solid var(--surf-3);border-radius:6px;padding:10px 12px;font-size:10.5px;color:var(--on-surf);font-family:'Roboto Mono',monospace;white-space:pre;overflow-x:auto;line-height:1.55;margin:0}
.sc-sel-table-wrap{overflow-x:auto;margin-bottom:10px}
.sc-sel-table{width:100%;border-collapse:collapse;font-size:12px}
.sc-sel-table th{background:var(--surf-3);color:var(--pri);font-weight:700;text-transform:uppercase;letter-spacing:.6px;font-size:10px;padding:7px 10px;border:1px solid var(--out-var);text-align:left}
.sc-sel-table td{padding:7px 10px;border:1px solid var(--out-var);color:var(--on-surf);vertical-align:top;font-family:'Roboto Mono',monospace;font-size:11.5px}
.sc-sel-table tr:nth-child(odd) td{background:var(--surf-3)}
.sc-sel-table tr:nth-child(even) td{background:var(--surf-2)}
.sc-sel-recs{margin:8px 0 0 0;padding-left:20px;font-size:12.5px;color:var(--on-surf-var);line-height:1.6}
.sc-sel-recs li{margin-bottom:6px}
.sc-sel-recs li.sc-rec-intro{list-style:none;margin-left:-20px;margin-bottom:8px;color:var(--on-surf);font-style:italic}
.sc-sel-recs li.sc-rec-hdr{list-style:none;margin-left:-20px;margin-bottom:8px;color:var(--on-surf);font-weight:600}
.sc-rec-variant{background:var(--surf-2);border:1px solid var(--surf-3);border-left:3px solid var(--pri);border-radius:5px;padding:8px 10px;margin:4px 0}
.sc-rec-variant .sc-rec-vt{font-weight:600;color:var(--on-surf);margin-bottom:4px;font-size:12.5px}
.sc-rec-variant .sc-rec-va{color:var(--on-surf);margin-bottom:4px;font-size:12px}
.sc-rec-variant .sc-rec-vw,.sc-rec-variant .sc-rec-vl{font-size:11.5px;color:var(--on-surf-var);margin-top:2px}
.sc-rec-variant .sc-rec-vw strong,.sc-rec-variant .sc-rec-vl strong{color:var(--pri);font-weight:600}
.sc-sel-disclaimer{font-size:11px;color:var(--on-surf-var);background:var(--surf-2);border:1px solid var(--surf-3);border-left:3px solid var(--out);border-radius:4px;padding:6px 10px;line-height:1.5;font-style:italic}
.sc-sel-disclaimer:empty{display:none}

/* ── SC sub-tab bar ────────────────────────────────────────────────────── */
.sc-subtab-bar{display:flex;border-radius:var(--r-md);overflow:hidden;border:1.5px solid var(--out);margin-bottom:14px}
.sc-subtab{flex:1;padding:10px 6px;font-size:13px;font-weight:500;background:transparent;border:none;border-right:1.5px solid var(--out);color:var(--on-surf-var);cursor:pointer;font-family:'Roboto',sans-serif;transition:background .2s var(--ease),color .2s var(--ease);letter-spacing:.2px}
.sc-subtab:last-child{border-right:none}
.sc-subtab.active{background:var(--sec-con);color:var(--on-sec-con);font-weight:600}
.sc-subtab:hover:not(.active){background:var(--pri-a)}

/* ── Cable Tray Fill ───────────────────────────────────────────────────── */
.tray-fill-bar-wrap{background:var(--out-var);border-radius:5px;height:10px;overflow:hidden}
.tray-fill-bar{height:10px;border-radius:5px;width:0%;transition:width .45s var(--ease),background .3s var(--ease)}
#tray-fill-limit-marker{position:absolute;top:0;width:2px;height:10px;background:rgba(255,165,0,.85);border-radius:1px;pointer-events:none;transform:translateX(-50%)}

/* ── Color Theme Picker ────────────────────────────────────────────────── */
.color-pick{display:flex;align-items:center;gap:6px}
.col-dot{
  width:17px;height:17px;border-radius:50%;
  border:2.5px solid transparent;cursor:pointer;padding:0;
  transition:transform .15s var(--ease),border-color .15s var(--ease),box-shadow .15s var(--ease);
  outline:none;flex-shrink:0;
}
.col-dot[data-color="teal"]{background:#7ECDE9}
.col-dot[data-color="red"]{background:#F28B82}
.col-dot[data-color="purple"]{background:#BB86FC}
.col-dot.active{border-color:var(--on-surf);box-shadow:0 0 0 2px var(--surf-1)}
.col-dot:hover:not(.active){transform:scale(1.25)}

/* ── Responsive ────────────────────────────────────────────────────────── */
@media(max-width:500px){
  .row.c2,.row.c3,.con-grid,.vd-grid,.conv-res,.ref-grid{grid-template-columns:1fr}
  .len-row{grid-template-columns:1fr}
  .sb-enc-tabs{width:100%}
  .sc-imp-grid{grid-template-columns:1fr 1fr}
  .sc-ik-grid{grid-template-columns:1fr}
  .sc-trip-pair{flex-direction:column}
  .msc-siz-table td,.msc-siz-table th{padding:7px 8px;font-size:11px}
}

/* ── Motor Cable Sizing ─────────────────────────────────────────────────── */
.msc-siz-rec-box{
  background:var(--pri-con-a);border:2px solid var(--pri-con);
  border-radius:var(--r-lg);padding:18px 20px;margin-bottom:16px;text-align:center;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
}
.msc-siz-rec-label{font-size:10px;font-weight:700;color:var(--on-surf-var);text-transform:uppercase;letter-spacing:1.2px;margin-bottom:6px}
.msc-siz-rec-value{font-size:30px;font-weight:800;color:var(--pri);font-family:'Roboto Mono',monospace;line-height:1.1}
.msc-siz-rec-awg{font-size:13px;color:var(--on-surf-var);margin-top:5px}
.msc-siz-table{width:100%;border-collapse:collapse;margin:12px 0 14px;font-size:13px}
.msc-siz-table th{background:var(--surf-3);color:var(--on-surf-var);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.6px;padding:8px 12px;text-align:left;border-bottom:1.5px solid var(--out-var)}
.msc-siz-table td{padding:9px 12px;border-bottom:1px solid var(--out-var);color:var(--on-surf);vertical-align:middle}
.msc-siz-table td:nth-child(2){font-family:'Roboto Mono',monospace;font-size:12.5px}
.msc-siz-table tr:last-child td{border-bottom:none}
.msc-siz-table tbody tr:hover td{background:var(--pri-a)}
.msc-siz-badge{display:inline-block;border-radius:var(--r-sm);padding:3px 12px;font-size:11px;font-weight:700;letter-spacing:.3px;white-space:nowrap}
.msc-siz-badge.pass{background:var(--suc-bg);color:var(--suc);border:1px solid var(--suc-bdr)}
.msc-siz-badge.fail{background:rgba(255,100,100,.15);color:#ff6464;border:1px solid rgba(255,100,100,.3)}
.msc-siz-badge.na{background:var(--surf-3);color:var(--on-surf-var);border:1px solid var(--out-var)}
.msc-siz-suggestion{background:var(--warn-bg);border:1px solid var(--warn-bdr);color:var(--warn-col);border-radius:var(--r-md);padding:10px 14px;margin-bottom:10px;font-size:13px;line-height:1.6}
.msc-siz-vfd-note{background:var(--info-bg);border:1px solid var(--info-bdr);color:var(--pri);border-radius:var(--r-md);padding:10px 14px;margin-bottom:10px;font-size:13px}

/* ── Bus Bar Sizing (IEC 61439) ────────────────────────────────────────── */
.bb-checks{display:flex;flex-direction:column;gap:6px;margin:10px 0}
.bb-check-row{display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:8px 12px;border-radius:var(--r-md);background:var(--surf-2);
  border:1px solid var(--out-var);flex-wrap:wrap}
.bb-check-lbl{font-size:12px;font-weight:600;color:var(--on-surf-var);letter-spacing:.2px;flex:1;min-width:0}
.bb-badge{display:inline-block;border-radius:var(--r-sm);padding:4px 12px;font-size:11.5px;
  font-weight:700;letter-spacing:.3px;white-space:nowrap;flex-shrink:0}
.bb-pass{background:var(--suc-bg);color:var(--suc);border:1px solid var(--suc-bdr)}
.bb-fail{background:rgba(255,100,100,.15);color:#ff6464;border:1px solid rgba(255,100,100,.35)}
.bb-warn{background:var(--warn-bg);color:var(--warn-col);border:1px solid var(--warn-bdr)}
.bb-kv-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px;margin:10px 0}
.bb-kv-cell{background:var(--surf-3);border:1px solid var(--out-var);border-radius:var(--r-md);
  padding:8px 12px;min-width:0}
.bb-kv-label{font-size:10px;font-weight:600;color:var(--on-surf-var);text-transform:uppercase;
  letter-spacing:.5px;margin-bottom:2px}
.bb-kv-val{font-family:'Roboto Mono',monospace;font-weight:700;color:var(--pri);font-size:14px}

/* ── Busbar sizing table ────────────────────────────────────────────────── */
.bb-siz-row:hover{background:var(--surf-2)}
.bb-siz-row-best td{font-weight:600}
.bb-siz-row td{border-bottom:1px solid var(--out-var)}

/* ── Rec-box sub-elements ──────────────────────────────────────────────── */
.rec-box-icon{font-size:26px;flex-shrink:0;line-height:1}
.rec-box-body{flex:1;min-width:0}

/* ── Range slider labels ───────────────────────────────────────────────── */
.wi-range-labels{display:flex;justify-content:space-between;font-size:10px;color:var(--on-surf-var);margin-top:3px;letter-spacing:.3px}

/* ── Divider size variants ─────────────────────────────────────────────── */
.divider-sm{height:1px;background:var(--out-var);margin:6px 0}
.divider-lg{height:1px;background:var(--out-var);margin:18px 0}

/* ── Focus-visible ring (keyboard nav) ─────────────────────────────────── */
.btn-primary:focus-visible,
.seg-btn:focus-visible,
.tab:focus-visible,
.lang-b:focus-visible,
.sb-add-btn:focus-visible,
.sc-import-btn:focus-visible,
.swap-btn:focus-visible{
  outline:2px solid var(--pri);
  outline-offset:2px;
}

/* ── IEC sub-tab calculator (Wire Size) ────────────────────────────────── */
.iec-card{
  background:var(--surf-1);border:1px solid var(--out-var);
  border-radius:var(--r-lg,12px);padding:14px 16px;margin-bottom:10px;
  border-left:4px solid var(--pri);
  transition:border-color .2s var(--ease);
}
.iec-card-rec{border-left-color:var(--suc);background:var(--suc-bg)}
.iec-card-pass{border-left-color:var(--suc)}
.iec-card-fail{border-left-color:var(--err);background:linear-gradient(90deg,rgba(255,80,80,.07),var(--surf-1) 40%)}
.iec-card-mini{padding:12px 14px}
.iec-card-hdr{
  font-size:10.5px;font-weight:700;color:var(--pri);
  text-transform:uppercase;letter-spacing:1.2px;margin-bottom:8px;
  display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;
}
.iec-lim-badge{
  display:inline-block;padding:3px 10px;border-radius:var(--r-sm);
  font-size:9.5px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;
  border:1px solid transparent;
}
.iec-lim-badge.iec-lim-amp{background:var(--pri-a);color:var(--pri);border-color:var(--pri-glow)}
.iec-lim-badge.iec-lim-vd{background:var(--warn-bg);color:var(--warn-col);border-color:var(--warn-bdr)}
.iec-big{
  font-size:1.8rem;font-weight:700;color:var(--on-surf);
  line-height:1.15;margin:2px 0 6px;font-family:'Roboto',sans-serif;
}
.iec-big .iec-sub{
  font-size:.85rem;font-weight:400;color:var(--on-surf-var);
  margin-left:6px;font-family:'Roboto Mono',monospace;
}
.iec-awg-note{
  display:flex;align-items:center;gap:5px;
  margin:-2px 0 6px;font-size:.78rem;color:var(--on-surf-var);
  font-family:'Roboto Mono',monospace;
}
.iec-awg-val{opacity:.75}
.iec-awg-tip{font-size:.7rem;cursor:help;font-family:'Roboto',sans-serif;background:transparent;border-color:var(--out-var);color:var(--on-surf-var)}
.iec-tbl{width:100%;border-collapse:collapse;font-size:12.5px;margin-top:6px}
.iec-tbl td{padding:5px 0;border-bottom:1px solid var(--out-var);color:var(--on-surf-var)}
.iec-tbl td:last-child{text-align:right;color:var(--on-surf);font-family:'Roboto Mono',monospace}
.iec-tbl tr.iec-tot td{border-top:1.5px solid var(--pri);border-bottom:none;padding-top:7px;color:var(--on-surf)}
.iec-fml{font-family:'Roboto Mono',monospace;font-size:11.5px;color:var(--on-surf-var);margin:4px 0 2px}
.iec-fml code{background:var(--surf-2);padding:2px 8px;border-radius:4px;border:1px solid var(--out-var)}
.iec-line{font-size:11.5px;color:var(--on-surf-var);margin-top:3px;font-family:'Roboto Mono',monospace}
.iec-iter{font-size:11px;color:var(--on-surf-var);margin-top:6px;font-style:italic;padding:6px 8px;background:var(--surf-2);border-radius:6px;border:1px dashed var(--out-var)}
.iec-row2{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:10px}
.iec-row2 .iec-card{margin-bottom:0}
.iec-warn{
  background:var(--warn-bg);border:1px solid var(--warn-bdr);
  border-left:4px solid var(--warn-col);
  border-radius:var(--r-md);padding:10px 14px;margin:10px 0;
  font-size:12px;color:var(--warn-col);line-height:1.5;
}
@media(max-width:560px){
  .iec-row2{grid-template-columns:1fr}
  .iec-big{font-size:1.5rem}
}

/* ── Reduced motion ────────────────────────────────────────────────────── */
@media(prefers-reduced-motion:reduce){
  *{transition-duration:.01ms!important;animation-duration:.01ms!important}
}