:root{
  --bg:#eef1f4; --panel:#ffffff; --panel2:#f7f8fa; --ink:#1e252d; --muted:#667382; --line:#cfd7e1;
  --accent:#2e5f8a; --accent2:#dcebf7; --ok:#177245; --warn:#a05a00; --danger:#b3261e;
  --input:#ffffff; --shadow:0 1px 3px rgba(0,0,0,.12);
}
body.night{
  --bg:#2f3338; --panel:#3b4047; --panel2:#343941; --ink:#eef2f7; --muted:#bac5d1; --line:#59626d;
  --accent:#9cc7ee; --accent2:#465868; --ok:#80d8a8; --warn:#ffc46b; --danger:#ff8a80; --input:#2f343a;
  --shadow:0 1px 4px rgba(0,0,0,.35);
}
*{box-sizing:border-box} html,body{height:100%} body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--ink);font-size:14px;line-height:1.45}.app-shell{min-height:100%;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--panel);border-bottom:1px solid var(--line);box-shadow:var(--shadow);position:sticky;top:0;z-index:20;flex-wrap:wrap}.brand{display:flex;align-items:baseline;gap:8px;margin-right:8px;white-space:nowrap}.brand-main{font-size:21px;font-weight:800;letter-spacing:.2px}.brand-sub{font-size:13px;color:var(--muted);font-weight:700}.spacer{flex:1}.btn,.module-tab,.calc-tab{border:1px solid var(--line);background:var(--panel2);color:var(--ink);padding:7px 10px;border-radius:6px;cursor:pointer;font-weight:700;min-height:32px;text-decoration:none}.btn:hover,.module-tab:hover,.calc-tab:hover{border-color:var(--accent)}.btn.primary,.app-tab.active,.module-tab.active,.calc-tab.active{background:var(--accent2);border-color:var(--accent);color:var(--accent)}.workspace{flex:1;padding:12px}.app-page{display:none}.app-page.active{display:block}.panel,.intro,.card,.module-card,.workflow,.faq{background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow)}.hero{padding:26px;max-width:1150px;margin:0 auto}.hero h1{margin:0 0 8px;font-size:26px}.hero p{color:var(--muted);font-size:15px}.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:18px}.home-card{text-align:left;background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:16px;color:var(--ink);cursor:pointer}.home-card strong{display:block;font-size:17px;color:var(--accent);margin-bottom:6px}.home-card span{display:block;color:var(--muted);font-size:13px}.module-shell{max-width:1220px;margin:0 auto}.module-tabs,.calc-tabs{display:flex;gap:6px;padding:8px 0 0;flex-wrap:wrap;border-bottom:1px solid var(--line);margin-bottom:12px}.module-page,.carbon-page{display:none}.module-page.active,.carbon-page.active{display:block}main{width:100%}.module-shell>h1,.module-shell h2{color:var(--ink)}.intro{padding:24px;margin-bottom:20px;text-align:center}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:14px}.card{overflow:hidden;margin-bottom:12px}.card-header{padding:12px 14px;background:var(--panel2);border-bottom:1px solid var(--line);font-weight:800;font-size:16px}.card-body{padding:14px}.method{border-left:5px solid var(--accent)}details{margin:10px 0;border:1px solid var(--line);border-radius:8px;background:var(--panel);overflow:hidden}summary{padding:10px 12px;background:var(--panel2);font-weight:800;cursor:pointer}.details-content,.details-body{padding:12px}table{border-collapse:collapse;margin:12px 0;width:100%;font-size:13px}th,td{border:1px solid var(--line);padding:7px 8px;vertical-align:middle;background:var(--panel)}th{background:var(--panel2);font-weight:800;text-align:center}td{text-align:left}td.left,th.left{text-align:left}.highlight{background:var(--accent2);padding:2px 6px;border-radius:4px}.pros,.status-ok{color:var(--ok)}.cons,.status-bad{color:var(--danger)}.warn-text,.status-warn{color:var(--warn)}.result-box{background:var(--accent2);padding:10px;border-radius:6px;margin-top:10px;font-weight:700;border:1px solid var(--accent)}.threshold-zone{padding:10px;margin:8px 0;border-radius:6px;border-left:5px solid}.zone-low{border-left-color:var(--ok);background:rgba(23,114,69,.1)}.zone-mid{border-left-color:var(--warn);background:rgba(160,90,0,.1)}.zone-high{border-left-color:var(--danger);background:rgba(179,38,30,.1)}.tool-box,.specification{background:var(--panel2);border-left:5px solid var(--ok);padding:12px;border-radius:8px;margin:12px 0}.flowchart,.equation{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:12px;margin:12px 0;overflow-x:auto}.flowchart{font-family:monospace}.equation{font-family:"Times New Roman",Times,serif;font-size:18px}.input-group{margin:10px 0;display:flex;gap:8px;align-items:center;flex-wrap:wrap}.pro-con{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:12px 0}.pro-box,.con-box{padding:12px;border-radius:6px}.pro-box{background:rgba(23,114,69,.1);border-left:4px solid var(--ok)}.con-box{background:rgba(179,38,30,.1);border-left:4px solid var(--danger)}.badge{display:inline-block;padding:4px 10px;border-radius:12px;font-size:12px;font-weight:700;margin:2px}.badge-urgent{background:rgba(179,38,30,.18);color:var(--danger)}.badge-moderate{background:rgba(160,90,0,.18);color:var(--warn)}.badge-preventive{background:rgba(23,114,69,.18);color:var(--ok)}.footer{color:var(--muted);text-align:center;padding:18px;border-top:1px solid var(--line);margin-top:24px}.calc-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:8px;margin-bottom:8px}.filetag{font-size:12px;color:var(--muted);max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.layout{display:grid;grid-template-columns:minmax(420px,560px) minmax(420px,1fr);gap:12px;align-items:start}.panel h2{margin:0;padding:10px 12px;font-size:15px;border-bottom:1px solid var(--line);background:var(--panel2)}.panel-body{padding:12px}.section-title{font-weight:800;margin:12px 0 6px;color:var(--accent)}.carbon-module .grid{display:grid;grid-template-columns:minmax(175px,1fr) minmax(105px,135px) minmax(70px,90px);gap:6px 8px;align-items:center}.carbon-module .results{display:grid;grid-template-columns:repeat(3,minmax(130px,1fr));gap:10px}.carbon-module .card .label{font-size:12px;color:var(--muted);font-weight:800;margin-bottom:6px}.carbon-module .card .value{font-size:22px;font-weight:800;line-height:1.1}.carbon-module .card .sub{font-size:12px;color:var(--muted);margin-top:4px}.canvas-wrap{height:360px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);padding:8px}canvas{width:100%;height:100%;display:block}input,select,textarea{border:1px solid var(--line);border-radius:5px;padding:7px 8px;background:var(--input);color:var(--ink);font:inherit;text-align:center}textarea{text-align:left;width:100%}.unit{font-size:12px;color:var(--muted)}label{font-weight:700}.hint,.footer-note{font-size:12px;color:var(--muted);line-height:1.35}.small-btn{font-size:12px;padding:5px 8px;min-height:26px}@media(max-width:980px){.layout{grid-template-columns:1fr}.topbar{align-items:flex-start}.filetag{max-width:100%}}@media(max-width:760px){.pro-con{grid-template-columns:1fr}.carbon-module .grid{grid-template-columns:1fr 110px 70px}.carbon-module .results{grid-template-columns:1fr 1fr}}@media print{.topbar,.module-tabs,.calc-tabs,.calc-toolbar,.btn{display:none!important}.app-page,.module-page,.carbon-page{display:block!important}.workspace{padding:0}body{background:#fff;color:#000}.layout{grid-template-columns:1fr}.panel{box-shadow:none;break-inside:avoid;margin-bottom:10px}}