/* ============================================================
   OCP Cluster Sizing — light theme, aligned to the Lab26 IAG look
   ============================================================ */

:root{
  --bg:        #EEF1F6;
  --bg-rail:   #16204A;
  --bg-rail-2: #1E2A5C;
  --panel:     #FFFFFF;
  --panel-2:   #F5F7FA;
  --line:      #DBE0E8;
  --line-soft: #E7EAF0;
  --text:      #12151C;
  --text-dim:  #4A5568;
  --text-mute: #7C8797;

  --accent:      #2F5FDE;
  --accent-dark: #1F44B8;
  --accent-soft: #E4EBFC;
  --red:      #D33636;
  --green:    #1C9A5B;

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --radius: 6px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

::selection{ background:var(--accent); color:#fff; }

/* ---------- layout shell ---------- */
.app{
  display:grid;
  grid-template-columns: 250px 1fr;
  min-height:100vh;
}

/* ---------- sidebar ---------- */
.rail{
  background:var(--bg-rail);
  border-right:1px solid var(--bg-rail);
  display:flex;
  flex-direction:column;
  position:sticky;
  top:0;
  height:100vh;
  padding:20px 14px;
}
.rail-head{
  display:flex;
  align-items:center;
  gap:10px;
  padding:2px 6px 22px;
  border-bottom:1px solid rgba(255,255,255,.12);
  margin-bottom:16px;
}
.rail-mark{
  width:36px; height:36px;
  border-radius:7px;
  background:var(--accent);
  color:#fff;
  font-weight:800;
  font-size:12px;
  letter-spacing:.02em;
  display:flex; align-items:center; justify-content:center;
  flex:none;
}
.rail-title{ display:flex; flex-direction:column; line-height:1.3; }
.rail-title strong{ font-size:14.5px; font-weight:650; color:#fff; }
.rail-title span{ font-size:11.5px; color:#9FACC9; }

.rail-steps{
  display:flex;
  flex-direction:column;
  gap:2px;
  flex:1;
}
.rail-step{
  display:flex;
  align-items:center;
  gap:10px;
  padding:10px 10px;
  border-radius:var(--radius);
  color:#C4CDE3;
  text-decoration:none;
  font-size:14px;
  font-weight:500;
  border:1px solid transparent;
  transition:background .12s ease, color .12s ease;
}
.rail-step:hover{ background:var(--bg-rail-2); color:#fff; }
.rail-step.active{
  background:var(--accent);
  color:#fff;
  border-color:var(--accent);
}
.rail-step .n{
  width:21px; height:21px;
  border-radius:5px;
  background:rgba(255,255,255,.12);
  color:#C4CDE3;
  font-family:var(--mono);
  font-size:11px;
  font-weight:700;
  display:flex; align-items:center; justify-content:center;
  flex:none;
}
.rail-step.active .n{ background:#fff; color:var(--accent); }

.rail-foot{ padding-top:14px; border-top:1px solid rgba(255,255,255,.12); }
.rail-readout{ display:flex; gap:10px; margin-bottom:12px; }
.rail-readout div{
  flex:1;
  background:var(--bg-rail-2);
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius);
  padding:8px 10px;
}
.rail-readout span{ display:block; font-size:10.5px; color:#93A1C2; text-transform:uppercase; letter-spacing:.04em; margin-bottom:3px; }
.rail-readout b{ font-family:var(--mono); font-size:17px; color:#fff; font-weight:600; }
.rail-note{ font-size:11px; color:#8592B0; line-height:1.45; }

/* ---------- main ---------- */
.main{ padding:28px 36px 60px; max-width:1180px; }

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:24px;
  margin-bottom:28px;
}
.topbar h1{ font-size:24px; font-weight:700; margin:0 0 6px; letter-spacing:-.01em; color:#0E1424; }
.topbar p{ margin:0; max-width:640px; color:var(--text-dim); font-size:14.5px; }

/* ---------- cards ---------- */
.card{
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-radius:10px;
  padding:24px 26px 26px;
  margin-bottom:20px;
  scroll-margin-top:24px;
  box-shadow:0 1px 2px rgba(16,24,40,.04);
}
.card-head{
  display:flex;
  gap:14px;
  align-items:flex-start;
  margin-bottom:18px;
}
.card-num{
  width:30px; height:30px;
  border-radius:7px;
  background:var(--accent-soft);
  color:var(--accent-dark);
  font-family:var(--mono);
  font-weight:700;
  font-size:14px;
  display:flex; align-items:center; justify-content:center;
  flex:none;
  margin-top:2px;
}
.card-head h2{ font-size:17.5px; font-weight:700; margin:0 0 4px; color:#0E1424; }
.card-head p{ margin:0; color:var(--text-dim); font-size:14px; max-width:680px; }

/* ---------- inputs ---------- */
.input-grid{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  margin-bottom:18px;
}
.field{
  display:flex;
  flex-direction:column;
  gap:6px;
  min-width:210px;
}
.field.wide{ min-width:340px; flex:1 1 340px; }
.field span{ font-size:13px; color:var(--text-dim); font-weight:600; }
.field span small{ color:var(--text-mute); font-weight:400; }

input[type=number], input[type=text], select{
  background:#fff;
  border:1px solid var(--line);
  color:var(--text);
  border-radius:5px;
  padding:10px 11px;
  font-family:var(--mono);
  font-size:14px;
  outline:none;
  transition:border-color .12s ease, box-shadow .12s ease;
}
input[type=number]:focus, input[type=text]:focus, select:focus{
  border-color:var(--accent);
  box-shadow:0 0 0 3px var(--accent-soft);
}
select{ font-family:var(--sans); }
input[type=text]{ font-family:var(--sans); }

/* ---------- tables ---------- */
.table-wrap{ overflow-x:auto; border:1px solid var(--line-soft); border-radius:8px; }
table{ width:100%; border-collapse:collapse; font-size:13.5px; min-width:720px; }
thead th{
  text-align:left;
  padding:10px 10px;
  background:var(--panel-2);
  color:#4A5568;
  font-weight:700;
  font-size:11.5px;
  text-transform:uppercase;
  letter-spacing:.03em;
  border-bottom:1px solid var(--line-soft);
  white-space:nowrap;
}
td{
  padding:8px 10px;
  border-bottom:1px solid var(--line-soft);
  font-family:var(--mono);
  white-space:nowrap;
  color:var(--text);
}
tbody tr:last-child td{ border-bottom:none; }
tbody tr:hover{ background:#FAFBFD; }
.col-name{ font-family:var(--sans); }
td.col-name{ font-family:var(--sans); }
.col-num{ text-align:right; }
td.col-num, td.num{ text-align:right; }

table input[type=number], table input[type=text]{
  width:100%;
  min-width:64px;
  background:transparent;
  border:1px solid transparent;
  padding:5px 6px;
  border-radius:4px;
  text-align:right;
  font-size:13.5px;
}
table input[type=text]{ text-align:left; font-family:var(--sans); }
table input:hover{ border-color:var(--line); }
table input:focus{ border-color:var(--accent); background:#fff; box-shadow:0 0 0 3px var(--accent-soft); }

.row-remove{
  background:none; border:none; color:var(--text-mute); cursor:pointer;
  font-size:16px; line-height:1; padding:4px 6px; border-radius:4px;
}
.row-remove:hover{ color:var(--red); background:#FBE9E9; }

.pick-radio{ width:17px; height:17px; accent-color:var(--accent); cursor:pointer; }

tr.selected-node{ background:var(--accent-soft); }
tr.selected-node td{ color:var(--text); }
tr.infeasible td{ color:var(--text-mute); }
tr.fits td{ color:var(--green); font-weight:600; }
tr.fits td:first-child{ font-weight:700; }

/* ---------- buttons ---------- */
.btn{
  background:var(--accent);
  color:#fff;
  border:none;
  border-radius:6px;
  padding:10px 15px;
  font-size:13.5px;
  font-weight:650;
  cursor:pointer;
  transition:background .12s ease;
}
.btn:hover{ background:var(--accent-dark); }
.btn.small{ padding:8px 13px; font-size:13px; }
.btn.ghost{
  background:#fff;
  border:1px solid var(--line);
  color:var(--text-dim);
}
.btn.ghost:hover{ border-color:var(--accent); color:var(--accent-dark); background:var(--accent-soft); }

.table-actions{ display:flex; gap:10px; margin-top:12px; }

/* ---------- stat rows ---------- */
.stat-row{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-top:18px;
}
.stat{
  flex:1 1 160px;
  background:var(--panel-2);
  border:1px solid var(--line-soft);
  border-radius:8px;
  padding:13px 15px;
}
.stat span{ display:block; font-size:12px; color:var(--text-mute); margin-bottom:5px; font-weight:600; }
.stat b{ font-family:var(--mono); font-size:17px; font-weight:700; color:var(--accent-dark); }

.hint{ margin:14px 2px 0; font-size:13px; color:var(--text-mute); }

/* ---------- callout ---------- */
.callout{
  border:1px solid #F1C64C;
  background:#FEF6DC;
  color:#7A5B00;
  border-radius:8px;
  padding:12px 15px;
  font-size:13.5px;
  margin-bottom:16px;
}

/* ---------- checklist ---------- */
.checklist{ margin:0; padding-left:20px; color:var(--text-dim); font-size:14px; }
.checklist li{ margin-bottom:9px; }
.checklist li::marker{ color:var(--accent); font-weight:700; }

/* ---------- result ---------- */
.card.result{ border-color:var(--accent); border-width:1.5px; }
.result-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(190px, 1fr));
  gap:12px;
}
.result-grid .r-item{
  background:var(--panel-2);
  border:1px solid var(--line-soft);
  border-radius:8px;
  padding:15px 17px;
}
.result-grid .r-item span{ display:block; font-size:12px; color:var(--text-mute); margin-bottom:6px; font-weight:600; }
.result-grid .r-item b{ font-family:var(--mono); font-size:20px; color:var(--accent-dark); font-weight:700; }
.result-grid .r-item.wide{ grid-column:1 / -1; }
.result-grid .r-item.wide b{ font-size:14.5px; color:var(--text); font-weight:500; font-family:var(--sans); line-height:1.6; }

.page-foot{
  text-align:center;
  color:var(--text-mute);
  font-size:12.5px;
  padding-top:10px;
}

/* ---------- responsive ---------- */
@media (max-width: 880px){
  .app{ grid-template-columns:1fr; }
  .rail{ position:relative; height:auto; flex-direction:row; align-items:center; overflow-x:auto; padding:12px; }
  .rail-head{ border:none; margin:0; padding:0 12px 0 0; }
  .rail-steps{ flex-direction:row; }
  .rail-foot{ display:none; }
  .main{ padding:20px 16px 40px; }
  .topbar{ flex-direction:column; }
}