:root{
  --bg:#f4f6f9; --surface:#ffffff; --surface2:#eef2f7;
  --ink:#1a2430; --ink2:#5a6b7d; --ink3:#8a99a9;
  --line:#dde4ec; --line2:#c9d3de;
  --brand:#185FA5; --brand2:#0C447C; --brandSoft:#E6F1FB;
  --ok:#0F6E56; --okSoft:#E1F5EE; --warn:#854F0B; --warnSoft:#FAEEDA;
  --bad:#A32D2D; --badSoft:#FCEBEB;
  --topbar-bg:rgba(255,255,255,.94);
  --field-bg:#ffffff;
  --r:12px; --r2:8px;
  --shadow:0 1px 2px rgba(16,32,54,.06),0 4px 14px rgba(16,32,54,.05);
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}
html[data-theme="dark"]{
  --bg:#0f1620; --surface:#182230; --surface2:#1f2b3a;
  --ink:#e6edf5; --ink2:#aeb9c6; --ink3:#7c8a99;
  --line:#2a3848; --line2:#3a4c60;
  --brand:#5da4e8; --brand2:#8ec0f0; --brandSoft:#16263a;
  --ok:#5DCAA5; --okSoft:#122b24; --warn:#FAC775; --warnSoft:#2b2413;
  --bad:#F09595; --badSoft:#331a1a;
  --topbar-bg:rgba(24,34,48,.92);
  --field-bg:#1f2b3a;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.25);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,"Segoe UI","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.55}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.hidden{display:none!important}

.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:10px 22px;background:var(--topbar-bg);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:11px}
.brand-logo{display:grid;place-items:center;width:40px;height:40px;border-radius:11px;background:var(--brandSoft);color:var(--brand);border:1px solid #cfe0f2}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-text strong{font-size:17px;color:var(--brand2);letter-spacing:.2px}
.tagline{font-size:12px;color:var(--ink3)}
.top-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.lang-wrap{display:flex;align-items:center;gap:7px;border:1px solid var(--line);border-radius:var(--r2);padding:5px 9px;background:var(--surface);color:var(--ink2)}
#langSel{border:none;outline:none;background:transparent;color:var(--ink);font-size:13.5px;cursor:pointer;max-width:150px}
.btn{display:inline-flex;align-items:center;gap:7px;padding:8px 14px;border-radius:var(--r2);font-size:13.5px;font-weight:500;border:1px solid transparent;cursor:pointer;transition:all .15s;white-space:nowrap}
.btn svg{flex:none}
.btn-ghost{background:var(--surface);border-color:var(--line);color:var(--ink2)}
.btn-ghost:hover{border-color:var(--line2);color:var(--brand);text-decoration:none;background:var(--surface2)}
.btn-solid{background:var(--brand);color:#fff}
.btn-solid:hover{background:var(--brand2);text-decoration:none}
.btn-sm{padding:5px 10px;font-size:12.5px}
.btn:disabled{opacity:.55;cursor:not-allowed}

main{max-width:1180px;margin:0 auto;padding:26px 22px 60px}
.hero{padding:14px 4px 26px}
.hero h1{font-size:29px;font-weight:600;color:var(--brand2);letter-spacing:.2px}
.hero-sub{max-width:880px;margin-top:10px;color:var(--ink2);font-size:15px}
.hero-note{margin-top:12px;font-size:13px;color:var(--ink3);border-left:3px solid var(--line2);padding-left:12px}

.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px;margin-top:8px}
.tool-card{display:flex;flex-direction:column;align-items:flex-start;gap:10px;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px;cursor:pointer;transition:all .15s;box-shadow:var(--shadow)}
.tool-card:hover{border-color:var(--line2);transform:translateY(-2px);box-shadow:0 6px 18px rgba(16,32,54,.09)}
.tool-card h3{font-size:15.5px;font-weight:600;color:var(--ink)}
.tool-card p{font-size:13px;color:var(--ink2)}
.tc-ico{display:grid;place-items:center;width:42px;height:42px;border-radius:11px;color:var(--c);background:color-mix(in srgb,var(--c) 9%,#fff);border:1px solid color-mix(in srgb,var(--c) 22%,#fff)}

.page-tool-head{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.tool-head{margin-bottom:18px}
.tool-head h2{font-size:23px;font-weight:600;color:var(--brand2);margin-top:10px}
.tool-title-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.export-actions{display:flex;gap:8px;margin-top:10px}
.tool-desc{color:var(--ink2);font-size:14px;margin-top:3px}
.back-btn{margin-bottom:4px}

.tool-layout{display:grid;grid-template-columns:380px 1fr;gap:18px;align-items:start}
@media(max-width:960px){.tool-layout{grid-template-columns:1fr}}

.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px}
.panel h3{font-size:14.5px;font-weight:600;color:var(--brand2);margin-bottom:14px;padding-bottom:9px;border-bottom:1px solid var(--line)}
.fgroup{margin-bottom:13px}
.fgroup label{display:block;font-size:12.8px;font-weight:500;color:var(--ink2);margin-bottom:4px}
.frow{display:flex;align-items:center;gap:8px}
.frow input[type=number],.frow select{flex:1;min-width:0;padding:8px 10px;border:1px solid var(--line2);border-radius:var(--r2);font-size:14px;color:var(--ink);background:var(--field-bg);outline:none;transition:border .15s}
.frow input[type=number]:focus,.frow select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(24,95,165,.12)}
.frow input[type=number]:disabled{background:var(--surface2);color:var(--ink3)}
.unit{font-size:12px;color:var(--ink3);white-space:nowrap;min-width:44px;text-align:right}
.frow .range-val{min-width:42px;text-align:right;font-size:12px;color:var(--ink2);font-family:var(--mono)}
input[type=range]{flex:1;accent-color:var(--brand);height:22px}
.ftip{font-size:11.8px;color:var(--ink3);margin-top:3px;line-height:1.45}
.actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.actions .btn{flex:1;justify-content:center}

.kpi-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.kpi{background:var(--surface2);border:1px solid var(--line);border-radius:var(--r2);padding:12px 14px}
.kpi .k-label{font-size:11.6px;color:var(--ink2);text-transform:uppercase;letter-spacing:.4px}
.kpi .k-val{font-size:21px;font-weight:600;color:var(--brand2);font-family:var(--mono);margin-top:3px}
.kpi .k-sub{font-size:11.8px;color:var(--ink3);margin-top:2px}
.kpi.k-warn .k-val{color:var(--warn)}
.kpi.k-bad .k-val{color:var(--bad)}
.kpi.k-good .k-val{color:var(--ok)}
.chart-box{margin:14px 0}
.chart-box h4{font-size:13px;font-weight:600;color:var(--ink);margin-bottom:8px}
.tbl{width:100%;border-collapse:collapse;font-size:13px;margin-top:10px}
.tbl th,.tbl td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:left}
.tbl th{color:var(--ink2);font-weight:500;font-size:12px;background:var(--surface2)}
.tbl td{font-family:var(--mono)}
.verdict{margin-top:14px;padding:12px 14px;border-radius:var(--r2);font-size:13.5px;line-height:1.6}
.verdict .v-t{font-weight:600;display:block;margin-bottom:3px}
.verdict.ok{background:var(--okSoft);color:var(--ok);border:1px solid #b8e0d2}
.verdict.warn{background:var(--warnSoft);color:var(--warn);border:1px solid #eedcae}
.verdict.bad{background:var(--badSoft);color:var(--bad);border:1px solid #f2cfcf}
.verdict.info{background:var(--brandSoft);color:var(--brand2);border:1px solid #cfe0f2}

.eq-box{margin:14px 0;background:var(--surface2);border:1px solid var(--line);border-radius:var(--r2);padding:12px 14px;font-size:13px}
.eq-box .eq-title{font-weight:600;color:var(--ink);margin-bottom:6px}
.eq-box code,.eq-box .formula{font-family:var(--mono);font-size:12.5px;color:var(--brand2);white-space:pre-wrap;word-break:break-word;line-height:1.7}
.ref-list{font-size:13px;color:var(--ink2);line-height:1.8}
.ref-list li{margin-left:18px;margin-bottom:4px}

.mc-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px;margin-top:8px}
.dist-opt{border:1px solid var(--line);border-radius:var(--r2);padding:9px 11px;background:var(--surface2);font-size:12.6px}
.dist-opt b{display:block;color:var(--ink);font-size:12.8px;margin-bottom:5px}
.dist-opt .frow{margin-top:5px}

.lcc-legend{display:flex;gap:18px;font-size:12.6px;color:var(--ink2);margin-bottom:6px}
.lcc-legend i{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:6px;vertical-align:-1px}

.disclaimer-strip{margin-top:16px;padding:10px 14px;border-radius:var(--r2);background:var(--warnSoft);border:1px solid #eedcae;color:var(--warn);font-size:12.6px}
.hist-panel{margin-top:26px}
.project-bar{display:flex;align-items:center;gap:9px;flex-wrap:wrap;margin-top:8px;padding:10px 14px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.project-bar .pb-lbl{font-size:12.5px;font-weight:600;color:var(--brand2)}
#projSel{border:1px solid var(--line2);border-radius:var(--r2);padding:6px 9px;font-size:13px;color:var(--ink);background:var(--field-bg);outline:none;max-width:220px;flex:1;min-width:120px}
#projSel:focus{border-color:var(--brand)}
.pb-del{color:var(--bad)}
.pb-sep{width:1px;height:22px;background:var(--line);margin:0 2px}
#tplSel{border:1px solid var(--line2);border-radius:var(--r2);padding:6px 9px;font-size:13px;color:var(--ink);background:var(--field-bg);outline:none;max-width:220px;min-width:130px}
#tplSel:focus{border-color:var(--brand)}
.logo-prev-wrap{margin-top:2px}
.logo-prev img{max-height:56px;border:1px solid var(--line2);border-radius:8px;padding:4px;background:var(--field-bg)}
.logo-empty{font-size:12px;color:var(--ink3)}
.cov-logo-img{max-height:84px;max-width:280px;object-fit:contain}
.hist-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.hist-head h3{font-size:15px;font-weight:600;color:var(--brand2)}
.hist-list{list-style:none;display:flex;flex-direction:column;gap:8px}
.hist-list li button{width:100%;text-align:left;display:flex;flex-direction:column;gap:2px;background:var(--surface);border:1px solid var(--line);border-radius:var(--r2);padding:9px 13px;cursor:pointer;font-size:13px;color:var(--ink);transition:border .15s}
.hist-list li button:hover{border-color:var(--line2);background:var(--surface2)}
.hist-list .hist-time{font-size:11.5px;color:var(--ink3)}
.hist-list .hist-sum{font-size:11.8px;color:var(--ink2);font-family:var(--mono)}
.conv-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:9px}
.conv-cell label{display:block;font-size:11.5px;color:var(--ink2);margin-bottom:3px}
.conv-cell input{width:100%;padding:7px 9px;border:1px solid var(--line2);border-radius:var(--r2);font-size:13.5px;color:var(--ink);outline:none;font-family:var(--mono)}
.conv-cell input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(24,95,165,.12)}
@media(max-width:960px){
  .tool-layout{grid-template-columns:1fr}
}
@media(max-width:720px){
  .topbar{padding:8px 12px;gap:8px}
  .top-actions{gap:6px}
  .top-actions .btn{padding:6px 10px;font-size:12.5px}
  main{padding:18px 12px 48px}
  .hero h1{font-size:22px}
  .hero-sub{font-size:14px}
  .card-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
  .tool-card{padding:13px}
  .tool-layout .panel{padding:12px}
  .kpi-row{grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:8px}
  .kpi .k-val{font-size:17px}
  .tbl{display:block;overflow-x:auto;white-space:nowrap}
  .tool-title-row h2{font-size:19px}
  .export-actions{width:100%}
  .conv-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}
  .brand{min-width:0}
  .tagline{display:none}
}
@media(max-width:480px){
  .brand{width:100%}
  .top-actions{width:100%;flex-wrap:wrap}
  .lang-wrap{flex:1 1 auto}
  .hero-note{font-size:12px}
  .project-bar .btn{flex:1}
}
footer{margin-top:10px;padding:22px;text-align:center;color:var(--ink3);font-size:12.6px;border-top:1px solid var(--line)}
.foot-note{margin-top:4px;font-size:12px}

.lds{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.4);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}

input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
input[type=number]{-moz-appearance:textfield}

html[data-theme="dark"] .brand-logo{border-color:#2a4a6e}
html[data-theme="dark"] select option{background:var(--field-bg);color:var(--ink)}

@media print{@page{size:A4;margin:16mm 13mm;@top-center{content:"PipeCorr Suite";font-size:9px;color:#8a99a9}@bottom-center{content:"Page " counter(page) " of " counter(pages);font-size:9px;color:#8a99a9}}}