/* Scoped engineering workspace; official header, banner and sidebar stay unchanged. */
.industrial-toolbox .toolbox-visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}.industrial-toolbox [hidden]{display:none!important}
.industrial-toolbox{--ink:#213b4c;--muted:#72828e;--line:#e1e8ed;--teal:#157d83;color:var(--ink);font:14px/1.65 "Microsoft YaHei",system-ui,sans-serif;background:white;border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 8px 24px #18334a04}
.industrial-toolbox *{box-sizing:border-box}.industrial-toolbox a{color:var(--teal);text-decoration:none}.industrial-toolbox button,.industrial-toolbox input,.industrial-toolbox select{font:inherit}.industrial-toolbox button{cursor:pointer}.industrial-toolbox button:focus-visible,.industrial-toolbox input:focus-visible,.industrial-toolbox select:focus-visible,.industrial-toolbox a:focus-visible{outline:3px solid #8ccacf;outline-offset:2px}
.industrial-toolbox .hero{padding:0 0 20px;border-bottom:1px solid #edf1f4;margin:0 0 20px}.industrial-toolbox .eyebrow{margin:0;font-size:11px;letter-spacing:.5px;color:var(--teal);font-weight:650}.industrial-toolbox h1{margin:5px 0 8px;font-size:27px;line-height:1.35;letter-spacing:0;color:var(--ink)}.industrial-toolbox .hero p:not(.eyebrow){margin:0;color:var(--muted);font-size:13px}.industrial-toolbox h2{font-size:18px;font-weight:650;line-height:1.4;margin:3px 0;color:var(--ink)}.industrial-toolbox h3{font-size:14px;line-height:1.5;margin:0 0 8px;color:var(--ink)}
.industrial-toolbox .tool-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:0 0 20px}.industrial-toolbox .tool-tabs button{display:flex;align-items:center;gap:10px;min-width:0;border:1px solid var(--line);border-radius:10px;background:#fafcfd;color:var(--ink);padding:14px 12px;text-align:left;font-weight:650;font-size:14px;transition:background .15s,border-color .15s}.industrial-toolbox .tool-tabs button[aria-pressed=true]{background:#fff5f5;border-color:#d77c85;box-shadow:inset 0 2px #c32130}.industrial-toolbox .tool-icon{display:grid;place-items:center;flex-shrink:0;width:35px;height:35px;border:1px solid #e4ebee;border-radius:9px;color:#4a6879;background:white}.industrial-toolbox .tool-tabs button[aria-pressed=true] .tool-icon{color:#bd2635;border-color:#eed1d5}.industrial-toolbox .tool-tabs small{display:block;font-size:10px;font-weight:400;color:var(--muted);margin-top:2px}.industrial-toolbox .tool-tabs b{display:none}
.industrial-toolbox .workspace{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:start}.industrial-toolbox .input-card,.industrial-toolbox .result-card{padding:18px;min-width:0;border:1px solid var(--line);border-radius:11px;background:white}.industrial-toolbox .input-card{background:#fafcfd}.industrial-toolbox .result-card{border-top:3px solid #14828a}.industrial-toolbox .section-heading{display:flex;justify-content:space-between;align-items:center;gap:8px}.industrial-toolbox .step{display:grid;place-items:center;flex-shrink:0;width:26px;height:26px;border-radius:7px;background:#edf2f5;font-size:12px;color:#718694}.industrial-toolbox .muted{color:var(--muted);font-size:11px;line-height:1.7;margin:12px 0 17px}
.industrial-toolbox .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px 12px}.industrial-toolbox label{display:block;font-size:12px;line-height:1.5;font-weight:600;min-width:0;margin:0;color:#435d6e}.industrial-toolbox label small{display:block;font-size:10px;font-weight:400;color:var(--muted);margin-top:4px}.industrial-toolbox input,.industrial-toolbox select{display:block;width:100%;height:40px;min-width:0;margin-top:6px;border:1px solid #d9e3ea;border-radius:7px;background:white;color:#243e50;padding:8px 10px;font-size:13px;box-shadow:none}.industrial-toolbox .subhead{font-weight:650;font-size:12px;color:var(--teal);border-top:1px solid var(--line);padding-top:14px;margin:18px 0 12px}.industrial-toolbox .group-row{display:grid;grid-template-columns:1.2fr .65fr .8fr;gap:8px;margin-bottom:12px}
.industrial-toolbox .form-actions,.industrial-toolbox .result-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:19px}.industrial-toolbox .primary,.industrial-toolbox .secondary{display:inline-flex;align-items:center;justify-content:center;min-height:38px;border-radius:7px;border:1px solid transparent;padding:9px 12px;font-size:12px;font-weight:600;line-height:1.4;text-decoration:none}.industrial-toolbox .primary{color:white;background:#be2635}.industrial-toolbox .primary:hover{background:#a61c29}.industrial-toolbox .secondary{background:white;border-color:#dbe4ea;color:#486274}.industrial-toolbox .secondary:hover{background:#f2f6f8}.industrial-toolbox button:disabled{opacity:.5;cursor:default}.industrial-toolbox #form-error{font-size:12px;color:#b32c39;margin:10px 0 0}.industrial-toolbox #copy-status{font-size:11px;color:var(--teal);margin:8px 0 0}
.industrial-toolbox .outcome{border:1px solid #cfe7de;border-radius:9px;background:#eef8f3;padding:15px;margin-top:18px}.industrial-toolbox .outcome h3{font-size:16px;color:#226b53;margin:0 0 5px}.industrial-toolbox .outcome p{font-size:12px;line-height:1.75;margin:0;color:#486b60}.industrial-toolbox .outcome.warn{background:#fff8ec;border-color:#efe0bf}.industrial-toolbox .outcome.warn h3{color:#8d601e}.industrial-toolbox .outcome.warn p{color:#7d6b4d}.industrial-toolbox .metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:14px 0 18px}.industrial-toolbox .metric{border:1px solid #e9eef2;background:#f8fafc;border-radius:8px;padding:12px 9px}.industrial-toolbox .metric small{display:block;font-size:10px;color:var(--muted);line-height:1.5;min-height:30px}.industrial-toolbox .metric strong{display:block;font-size:24px;font-weight:650;line-height:1.5;color:#244d60;overflow-wrap:anywhere}.industrial-toolbox .metric em{font-size:10px;font-style:normal;color:var(--muted)}
.industrial-toolbox .formula{font-size:12px;border-top:1px solid var(--line);padding-top:14px}.industrial-toolbox .formula strong{font-size:12px}.industrial-toolbox .formula p{font-size:11px;color:var(--muted);line-height:1.8;margin:7px 0;overflow-wrap:anywhere}.industrial-toolbox .checks{list-style:none;padding:0;margin:15px 0}.industrial-toolbox .checks li{border-top:1px solid #e9eef2;padding:12px 0;font-size:12px}.industrial-toolbox .checks strong{display:block;line-height:1.6}.industrial-toolbox .checks p{color:var(--muted);font-size:11px;line-height:1.8;margin:5px 0 0}.industrial-toolbox .tag{float:right;font-size:10px;line-height:1.5;font-weight:500;padding:2px 6px;border-radius:5px;color:#267259;background:#edf7f1;margin-left:6px}.industrial-toolbox .tag.warn{color:#92691f;background:#fff5e2}.industrial-toolbox .sources{font-size:10px;color:var(--muted);margin:14px 0 0;line-height:1.8}.industrial-toolbox .sources a{text-decoration:underline}.industrial-toolbox .notes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;border-top:1px solid var(--line);padding-top:20px;margin-top:24px}.industrial-toolbox .notes p{font-size:11px;line-height:1.8;color:var(--muted);margin:0 0 8px}.industrial-toolbox .notes a{font-size:11px;font-weight:600}
.fctel-toolbox-page .toolbox-categories{display:flex;gap:5px;flex-wrap:wrap;align-items:center;border:1px solid #e1e8ed;border-radius:12px;background:white;padding:12px;margin-bottom:14px}.fctel-toolbox-page .toolbox-categories a{display:block;padding:7px 10px;border-radius:7px;color:#71818c;font-size:13px;white-space:nowrap;text-decoration:none}.fctel-toolbox-page .toolbox-categories a[aria-current=page]{background:#fff0f2;color:#b92131;font-weight:650}.fctel-toolbox-page .toolbox-categories a:hover{background:#f5f8fa;color:#b92131}
@media(max-width:1199px) and (min-width:992px){.industrial-toolbox{padding:18px}.industrial-toolbox .workspace{grid-template-columns:1fr}.industrial-toolbox .tool-tabs button{display:block}.industrial-toolbox .tool-icon{margin-bottom:7px}.industrial-toolbox .notes{grid-template-columns:1fr}.industrial-toolbox .metric small{min-height:0}}
@media(max-width:767px){.industrial-toolbox{padding:17px 13px;border-radius:11px}.industrial-toolbox h1{font-size:23px}.industrial-toolbox .hero{padding-bottom:15px;margin-bottom:15px}.industrial-toolbox .tool-tabs{gap:7px;margin-bottom:15px}.industrial-toolbox .tool-tabs button{display:block;padding:11px 8px;font-size:12px}.industrial-toolbox .tool-icon{margin-bottom:7px;width:30px;height:30px}.industrial-toolbox .tool-tabs small{font-size:9px}.industrial-toolbox .workspace{grid-template-columns:1fr;gap:14px}.industrial-toolbox .input-card,.industrial-toolbox .result-card{padding:15px 12px}.industrial-toolbox .form-grid{gap:12px 10px}.industrial-toolbox h2{font-size:17px}.industrial-toolbox .metric strong{font-size:22px}.industrial-toolbox .notes{grid-template-columns:1fr;gap:17px}.fctel-toolbox-page .toolbox-categories{gap:1px;padding:8px}.fctel-toolbox-page .toolbox-categories a{font-size:11px;padding:6px 8px}}
@media print{.fctel-toolbox-page .topwelcome,.fctel-toolbox-page .fctel-site-header,.fctel-toolbox-page .commonbanner,.fctel-toolbox-page .Twonavbox,.fctel-toolbox-page .mnav,.fctel-toolbox-page .fc-breadcrumb-band,.fctel-toolbox-page .col-lg-3,.fctel-toolbox-page .toolbox-categories,.industrial-toolbox .hero,.industrial-toolbox .tool-tabs,.industrial-toolbox .input-card,.industrial-toolbox .notes,.industrial-toolbox .result-actions,.fctel-toolbox-page .footer,.fctel-toolbox-page .qq,.industrial-toolbox #copy-status{display:none!important}.industrial-toolbox{border:0;box-shadow:none;padding:0}.industrial-toolbox .workspace{display:block}.industrial-toolbox .result-card{border:0;padding:0}.fctel-toolbox-page .col-lg-9{width:100%}}

/* Readability pass across all three tools: comfortably readable, not tiny captions. */
.industrial-toolbox{--muted:#526777;font-size:16px;line-height:1.75}
.industrial-toolbox .eyebrow{font-size:14px;letter-spacing:0}
.industrial-toolbox h2{font-size:22px;line-height:1.45}
.industrial-toolbox h3{font-size:17px}
.industrial-toolbox .tool-tabs button{font-size:17px;padding:16px;gap:12px}
.industrial-toolbox .tool-tabs small{font-size:13px;line-height:1.6}
.industrial-toolbox .input-card,.industrial-toolbox .result-card{padding:22px}
.industrial-toolbox .step{font-size:15px;color:#4f6576;width:30px;height:30px}
.industrial-toolbox .muted{font-size:14px;line-height:1.8;margin:14px 0 20px}
.industrial-toolbox .form-grid{gap:20px 18px;align-items:start}
.industrial-toolbox label{font-size:15px;line-height:1.6;color:#263f51}
.industrial-toolbox label small{font-size:14px;line-height:1.8;color:var(--muted);margin-top:8px}
.industrial-toolbox input,.industrial-toolbox select{height:46px;font-size:17px;line-height:1.4;padding:10px 12px;margin-top:8px;border-color:#cbd8e2;border-radius:8px}
.industrial-toolbox input[type=number]{width:150px;max-width:100%;font-variant-numeric:tabular-nums}
.industrial-toolbox select{width:280px;max-width:100%;font-size:16px}
.industrial-toolbox .subhead{font-size:16px;line-height:1.65;margin:24px 0 16px;padding-top:18px}
.industrial-toolbox .group-row{gap:12px;margin-bottom:18px}
.industrial-toolbox .primary,.industrial-toolbox .secondary{font-size:15px;min-height:44px;padding:11px 14px}
.industrial-toolbox .form-actions,.industrial-toolbox .result-actions{gap:10px;margin-top:24px}
.industrial-toolbox #form-error,.industrial-toolbox #copy-status{font-size:14px;line-height:1.75}
.industrial-toolbox .outcome{padding:18px;margin-top:20px}
.industrial-toolbox .outcome h3{font-size:20px;font-weight:650;line-height:1.5}
.industrial-toolbox .outcome p{font-size:15px;line-height:1.8}
.industrial-toolbox .metrics{gap:10px;margin:18px 0 24px}
.industrial-toolbox .metric{padding:15px 12px}
.industrial-toolbox .metric small{font-size:14px;line-height:1.65;min-height:46px;color:#526777}
.industrial-toolbox .metric strong{font-size:32px;line-height:1.5;font-variant-numeric:tabular-nums}
.industrial-toolbox .metric em{font-size:13px;color:#526777}
.industrial-toolbox .formula{font-size:15px;padding-top:18px;margin-top:18px}
.industrial-toolbox .formula strong{font-size:16px;color:#263f51}
.industrial-toolbox .formula p{font-size:15px;line-height:1.85;margin:10px 0;color:var(--muted)}
.industrial-toolbox .checks li{font-size:16px;padding:16px 0}
.industrial-toolbox .checks p{font-size:15px;line-height:1.85;margin-top:8px}
.industrial-toolbox .tag{font-size:13px;padding:3px 8px;line-height:1.5}
.industrial-toolbox .sources{font-size:13px;line-height:1.85;margin-top:18px}
.industrial-toolbox .notes{gap:22px;padding-top:24px;margin-top:28px}
.industrial-toolbox .notes p,.industrial-toolbox .notes a{font-size:14px;line-height:1.85}
@media(max-width:1199px){
  .industrial-toolbox .workspace{grid-template-columns:1fr}
  .industrial-toolbox .metric small{min-height:0}
}
@media(max-width:767px){
  .industrial-toolbox{padding:18px 14px}
  .industrial-toolbox .tool-tabs{grid-template-columns:1fr;gap:9px}
  .industrial-toolbox .tool-tabs button{display:flex;font-size:17px;padding:13px 14px}
  .industrial-toolbox .tool-tabs small{font-size:13px}
  .industrial-toolbox .tool-icon{width:35px;height:35px;margin:0}
  .industrial-toolbox .input-card,.industrial-toolbox .result-card{padding:18px 14px}
  .industrial-toolbox h2{font-size:21px}
  .industrial-toolbox .metric{padding:12px 9px}
  .industrial-toolbox .metric small{font-size:13px;min-height:44px}
  .industrial-toolbox .metric strong{font-size:28px}
}
@media(max-width:480px){
  .industrial-toolbox .form-grid{grid-template-columns:1fr;gap:18px}
  .industrial-toolbox .group-row{grid-template-columns:1fr}
  .industrial-toolbox .metrics{grid-template-columns:1fr}
  .industrial-toolbox .metric{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:10px}
  .industrial-toolbox .metric small{min-height:0}
}

/* Compact grouped workspace; keep readable type while removing vertical waste. */
.industrial-toolbox{padding:18px}
.industrial-toolbox .tool-tabs{margin-bottom:14px;gap:10px}
.industrial-toolbox .tool-tabs button{padding:10px 14px}
.industrial-toolbox .workspace{gap:16px}
.industrial-toolbox .input-card,.industrial-toolbox .result-card{padding:16px}
.industrial-toolbox .section-heading .eyebrow{display:none}
.industrial-toolbox .section-heading h2{font-size:21px;margin:0}
.industrial-toolbox .muted{margin:7px 0 12px;line-height:1.5}
.industrial-toolbox .input-block{min-width:0;padding:10px 12px;margin:0 0 10px;border:1px solid;border-radius:9px}
.industrial-toolbox .input-block legend{float:none;width:auto;max-width:100%;padding:0 7px;margin:0;font-size:15px;font-weight:650;line-height:1.5;border:0}
.industrial-toolbox .link-block{background:#f0f7fc;border-color:#cbdfea}
.industrial-toolbox .link-block legend{color:#28617e}
.industrial-toolbox .loss-block{background:#fff9ee;border-color:#ecdcb7}
.industrial-toolbox .loss-block legend{color:#806024}
.industrial-toolbox .module-block{background:#f6f3fb;border-color:#ded4eb}
.industrial-toolbox .module-block legend{color:#635080}
.industrial-toolbox .form-grid{gap:10px 16px;align-items:center}
.industrial-toolbox .form-grid>label{display:grid;grid-template-columns:minmax(0,1fr) 110px;align-items:center;gap:8px;font-size:15px;line-height:1.45}
.industrial-toolbox input,.industrial-toolbox select{height:36px;margin:0;padding:6px 9px;font-size:16px;border-radius:6px}
.industrial-toolbox input[type=number]{width:110px;max-width:100%}
.industrial-toolbox .form-grid select{width:110px;font-size:15px}
.industrial-toolbox .form-grid label small{grid-column:1/-1;margin:0}
.industrial-toolbox #custom-wave{grid-column:1/-1}
.industrial-toolbox #custom-wave label{display:grid;grid-template-columns:1fr 110px;align-items:center}
.industrial-toolbox .field-help{margin-top:7px;font-size:14px;line-height:1.6}
.industrial-toolbox summary{cursor:pointer;color:#405f73;font-size:14px;font-weight:600;line-height:1.6}
.industrial-toolbox summary:focus-visible{outline:3px solid #8ccacf;outline-offset:2px}
.industrial-toolbox .field-help p{margin:6px 0 0;color:#526777;font-size:14px}
.industrial-toolbox .group-row{margin-bottom:9px;gap:10px}
.industrial-toolbox .group-row label{font-size:15px}
.industrial-toolbox .group-row input,.industrial-toolbox .group-row select{margin-top:4px}
.industrial-toolbox .group-row select{width:100%}
.industrial-toolbox .form-actions,.industrial-toolbox .result-actions{margin-top:12px;gap:8px}
.industrial-toolbox .primary,.industrial-toolbox .secondary{min-height:38px;padding:8px 11px}
.industrial-toolbox .outcome{margin-top:13px;padding:13px 15px}
.industrial-toolbox .outcome h3{font-size:20px;margin-bottom:4px}
.industrial-toolbox .metrics{margin:12px 0;gap:9px}
.industrial-toolbox .metric{padding:10px}
.industrial-toolbox .metric small{min-height:0;font-size:14px;line-height:1.5}
.industrial-toolbox .metric strong{font-size:29px;line-height:1.35;margin:5px 0 1px}
.industrial-toolbox .checks{margin:10px 0}
.industrial-toolbox .checks li{padding:10px 0}
.industrial-toolbox .checks p{margin-top:4px;line-height:1.65}
.industrial-toolbox .calculation-details{border:1px solid #dce5ed;border-radius:7px;padding:9px 12px;background:#f8fafc;margin:10px 0}
.industrial-toolbox .calculation-details .formula{padding-top:10px;margin-top:10px}
.industrial-toolbox .calculation-details .formula p{margin:7px 0;line-height:1.7}
@media(max-width:1399px){
  .industrial-toolbox .form-grid>label{display:block}
  .industrial-toolbox .form-grid input,.industrial-toolbox .form-grid select{margin-top:4px}
}
@media(max-width:1199px) and (min-width:768px){
  .industrial-toolbox .form-grid>label{display:grid;grid-template-columns:minmax(0,1fr) 110px}
  .industrial-toolbox .form-grid input,.industrial-toolbox .form-grid select{margin:0}
}
@media(max-width:767px){
  .industrial-toolbox{padding:14px 10px}
  .industrial-toolbox .input-card,.industrial-toolbox .result-card{padding:14px 10px}
  .industrial-toolbox .tool-tabs button{padding:10px 12px}
  .industrial-toolbox .input-block{padding:9px 10px}
  .industrial-toolbox .form-grid{gap:10px}
}
@media(max-width:480px){
  .industrial-toolbox .form-grid>label{display:grid;grid-template-columns:minmax(0,1fr) 110px}
  .industrial-toolbox .metric strong{margin:0}
}
@media print{
  .industrial-toolbox .calculation-details{background:white;border:0}
  .industrial-toolbox .calculation-details summary{display:none}
}