/* Pavement Designer — local UI styling */
:root{
  --bg:#0f1419; --surface:#1a212b; --surface2:#222b37; --line:#2c3744;
  --text:#e7edf3; --muted:#9aa7b4; --accent:#4ea1ff; --accent2:#36c692;
  --warn:#ff6b6b; --ok:#36c692; --shadow:0 6px 24px rgba(0,0,0,.35);
  --r:12px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:linear-gradient(180deg,#0d1218,#0f1419 240px);
  color:var(--text); font:15px/1.5 -apple-system,BlinkMacSystemFont,"SF Pro Text",
  "Segoe UI",Roboto,Helvetica,Arial,sans-serif; min-height:100vh;
}

/* Topbar */
.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:18px 28px; border-bottom:1px solid var(--line);
  background:rgba(17,22,29,.7); backdrop-filter:blur(8px);
  position:sticky; top:0; z-index:10;
}
.brand{display:flex; align-items:center; gap:14px}
.logo{font-size:26px; color:var(--accent); letter-spacing:-3px}
.topbar h1{font-size:19px; margin:0; font-weight:650}
.sub{margin:0; color:var(--muted); font-size:12.5px}
.tabs{display:flex; gap:6px}
.tab{
  background:transparent; color:var(--muted); border:1px solid transparent;
  padding:8px 16px; border-radius:9px; cursor:pointer; font-size:14px;
  transition:.15s;
}
.tab:hover{color:var(--text); background:var(--surface)}
.tab.active{color:var(--text); background:var(--surface2); border-color:var(--line)}

main{max-width:1080px; margin:0 auto; padding:26px}
.panel{display:none; animation:fade .25s ease}
.panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* Cards */
.card{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--r);
  padding:20px 22px; margin-bottom:18px; box-shadow:var(--shadow);
}
.card h2{font-size:15px; margin:0 0 16px; font-weight:620; letter-spacing:.2px}
.card-head{display:flex; align-items:center; justify-content:space-between; margin-bottom:8px}
.card-head h2{margin:0}
.hint{color:var(--muted); font-size:12.5px; font-weight:400}
.grid{display:grid; grid-template-columns:1fr 1fr; gap:18px}
.grid3{display:grid; grid-template-columns:repeat(3,1fr); gap:14px; margin-bottom:18px}

/* Fields */
.field{margin-bottom:13px}
.field label{display:block; font-size:13px; color:var(--muted); margin-bottom:5px}
.field input,.field select{
  width:100%; background:var(--bg); border:1px solid var(--line); color:var(--text);
  padding:9px 11px; border-radius:8px; font-size:14px; transition:.15s;
}
.field input:focus,.field select:focus{outline:none; border-color:var(--accent)}
.field input.readonly{color:var(--muted); background:#10161d}
.field.check label{display:flex; align-items:center; gap:8px; color:var(--text); margin-top:8px}
.field.check input{width:auto}

/* Layer table */
table.layers{width:100%; border-collapse:collapse}
table.layers th{
  text-align:left; font-size:12px; color:var(--muted); font-weight:500;
  padding:6px 8px; border-bottom:1px solid var(--line)
}
table.layers td{padding:5px 8px}
table.layers input{
  width:100%; background:var(--bg); border:1px solid var(--line); color:var(--text);
  padding:7px 9px; border-radius:7px; font-size:13.5px
}
table.layers input:focus{outline:none; border-color:var(--accent)}
.rm{background:transparent;border:none;color:var(--muted);cursor:pointer;font-size:18px}
.rm:hover{color:var(--warn)}
.subgrade-row input{opacity:.85}

/* Buttons */
.actions{display:flex; gap:10px; align-items:center; margin:6px 0 4px; flex-wrap:wrap}
.btn-primary,.btn-secondary,.btn-ghost{
  border-radius:9px; padding:11px 22px; font-size:14px; cursor:pointer;
  border:1px solid transparent; transition:.15s; font-weight:550
}
.btn-primary{background:var(--accent); color:#06121f}
.btn-primary:hover{filter:brightness(1.08)}
.btn-secondary{background:var(--surface2); color:var(--text); border-color:var(--line)}
.btn-secondary:hover{border-color:var(--accent)}
.btn-ghost{background:transparent; color:var(--accent); border-color:var(--line); padding:8px 14px}
.btn-ghost:hover{background:var(--surface2)}
.actions input[type=text]{
  background:var(--bg); border:1px solid var(--line); color:var(--text);
  padding:10px 12px; border-radius:8px; font-size:14px; min-width:220px
}
.msg{color:var(--muted); font-size:13px; min-height:18px; margin-top:8px}

/* Verdict */
.verdict{
  border-radius:var(--r); padding:18px 22px; margin-bottom:18px; font-weight:650;
  font-size:17px; display:flex; align-items:center; gap:12px; border:1px solid var(--line)
}
.verdict.safe{background:rgba(54,198,146,.12); color:var(--ok); border-color:rgba(54,198,146,.4)}
.verdict.unsafe{background:rgba(255,107,107,.12); color:var(--warn); border-color:rgba(255,107,107,.4)}

/* Result cards */
.rcard{background:var(--surface); border:1px solid var(--line); border-radius:var(--r); padding:16px 18px}
.rcard .lbl{color:var(--muted); font-size:12.5px; margin-bottom:6px}
.rcard .val{font-size:23px; font-weight:680; letter-spacing:-.3px}
.rcard .unit{font-size:13px; color:var(--muted); font-weight:400}
.rcard .pill{display:inline-block; margin-top:8px; font-size:12px; padding:3px 10px; border-radius:20px}
.pill.ok{background:rgba(54,198,146,.15); color:var(--ok)}
.pill.no{background:rgba(255,107,107,.15); color:var(--warn)}

/* Readout tables */
table.readout{width:100%; border-collapse:collapse; font-size:13.5px}
table.readout th,table.readout td{padding:9px 10px; border-bottom:1px solid var(--line); text-align:left}
table.readout th{color:var(--muted); font-weight:500; font-size:12.5px}
table.readout td.num{font-variant-numeric:tabular-nums; text-align:right}
.err-good{color:var(--ok)} .err-bad{color:var(--warn)}

.plot{width:100%; height:420px; margin-top:8px}
.foot{text-align:center; color:var(--muted); font-size:12px; padding:24px}
code{background:var(--surface2); padding:1px 6px; border-radius:5px; font-size:12.5px}

@media (max-width:760px){
  .grid,.grid3{grid-template-columns:1fr}
  .tabs{flex-wrap:wrap}
}

/* ---- print / PDF styling ---- */
@media print {
  .topbar, .foot, .actions, .btn-ghost, #addLayer { display:none !important; }
  body { background:#fff; color:#111; }
  .panel { display:block !important; page-break-inside:avoid; }
  .card { box-shadow:none; border-color:#ccc; background:#fff; }
  .verdict.safe { color:#1a7f5a; } .verdict.unsafe { color:#b3261e; }
  .rcard, table.readout td, table.readout th { color:#111; }
  h1,h2 { color:#111; }
}

/* data tables under plots */
.datatable{ margin-top:10px; }
.datatable summary{ cursor:pointer; color:var(--accent); font-size:13px; padding:4px 0; }
.datatable summary:hover{ text-decoration:underline; }
.datatable table{ margin-top:8px; max-height:280px; display:block; overflow-y:auto; }
table.layers select{
  width:100%; background:var(--bg); border:1px solid var(--line); color:var(--text);
  padding:6px 7px; border-radius:7px; font-size:12.5px;
}
table.layers select:focus{ outline:none; border-color:var(--accent); }

/* widen the Type dropdown so material names are not cut off */
table.layers td:nth-child(3){ min-width:190px; }
table.layers select{ min-width:185px; }

/* modulus cell: value on top (full width, always visible), lock+edit below */
.ecell{ display:flex; flex-direction:column; gap:3px; }
.ecell input{ width:100%; }
.elockrow{ display:none; align-items:center; gap:6px; padding-left:2px; }
.elock{ font-size:11px; opacity:.75; }
.eedit{ font-size:11px; color:var(--accent); cursor:pointer;
        text-decoration:underline; white-space:nowrap; }
.eedit:hover{ filter:brightness(1.2); }
/* show lock + edit only when the row's modulus is auto-filled (locked) */
tr.locked .elockrow{ display:flex; }
tr.locked input[data-k="E"]{ color:var(--text); background:#0d141c; border-style:dashed; }

/* CTB Checks tab */
.ctb-grid{display:flex; gap:16px; flex-wrap:wrap; margin:10px 0}
.ctb-grid label{display:flex; flex-direction:column; font-size:12.5px;
  color:var(--muted); gap:4px}
.ctb-grid input{padding:6px 8px; border:1px solid var(--line);
  border-radius:6px; width:160px}
.ctb-spectrum{display:flex; gap:14px; flex-wrap:wrap; margin-top:8px}
.ctb-spectrum label{display:flex; flex-direction:column; font-size:12.5px;
  color:var(--muted); gap:4px; flex:1; min-width:150px}
.ctb-spectrum textarea{font-family:ui-monospace,Menlo,monospace; font-size:12px;
  padding:6px 8px; border:1px solid var(--line); border-radius:6px; resize:vertical}

/* Derivation (calculation steps) table */
table.deriv td{padding:6px 8px; vertical-align:top; font-size:12.5px}
table.deriv .mono{font-family:ui-monospace,Menlo,monospace; font-size:11.5px;
  color:var(--ink)}
table.deriv .ref{color:var(--muted); font-size:11px; white-space:nowrap}
table.deriv .num{white-space:nowrap}