:root{
  --bg:#070e24; --bg2:#0d1838; --panel:#0f1b3f; --panel2:#142250; --line:rgba(255,255,255,.10);
  --tx:#e8eeff; --mut:#9fb0d8; --gold:#ffd23f; --red:#ff5d6c; --blue:#4cc9f0; --orange:#ff9f1c;
  --teal:#2ec4b6; --green:#7bd88f; --purple:#b197fc;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--tx);font:14px/1.45 "Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  display:grid;grid-template-rows:auto 1fr auto;overflow:hidden}
button{font:inherit;color:inherit;cursor:pointer}
h2{margin:0}

/* ---------- header ---------- */
.header-banner { width: 100%; height: 100px; display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; }
.header-left { flex: 1; display: flex; align-items: center; gap: 10px; }
.header-left img { height: 60px; }
.header-left .school-info p { margin: 0; font-size: 10px; text-transform: uppercase; color: white; }
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:8px 16px;
  background:linear-gradient(180deg,#0c1740,#0a1334);border-bottom:2px solid var(--gold);z-index:5}
.brand{display:flex;gap:12px;align-items:center;min-width:0}
.brand b{display:block;color:var(--gold);letter-spacing:.04em;font-size:15px;white-space:nowrap}
.brand small{color:var(--mut);display:block;font-size:12px}
.logo{font-size:26px;color:var(--gold);line-height:1}
.tools{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{background:transparent;border:0;padding:6px 10px;font-size:12.5px;border-right:1px solid var(--line)}
.seg button:last-child{border-right:0}
.seg button:hover{background:rgba(255,255,255,.08)}
.chk{display:flex;align-items:center;gap:5px;font-size:12.5px;color:var(--mut);cursor:pointer;user-select:none}
.chk input{accent-color:var(--gold)}
.btn{border:1px solid var(--line);background:rgba(255,255,255,.06);border-radius:8px;padding:6px 12px}
.btn:hover{background:rgba(255,255,255,.12)}
.btn:disabled{opacity:.35;cursor:default}
.btn.gold{background:var(--gold);color:#1a1a1a;border-color:var(--gold);font-weight:600}
.btn.gold:hover{filter:brightness(1.08)}

/* ---------- main ---------- */
main{display:grid;grid-template-columns:minmax(0,1fr) minmax(380px,34vw);min-height:0}
#stage{position:relative;min-height:0;background:radial-gradient(1200px 700px at 35% 30%,#17306e 0%,#0b1637 55%,#060b1d 100%);overflow:hidden}
#stage canvas.gl,#stage .css2d{position:absolute;inset:0}
#stage .css2d{pointer-events:auto}
.hud{position:absolute;right:14px;top:12px;pointer-events:none;z-index:3}
#summary{background:rgba(7,14,36,.72);border:1px solid var(--line);border-radius:10px;padding:8px 12px;backdrop-filter:blur(6px)}
.sumrow{font-size:13px}
.sumchips{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.chip{font-size:11.5px;padding:2px 8px;border-radius:99px;border:1px solid}
.chip.ok{color:var(--green);border-color:rgba(123,216,143,.5);background:rgba(123,216,143,.1)}
.chip.bad{color:var(--red);border-color:rgba(255,93,108,.5);background:rgba(255,93,108,.1)}
.hint{position:absolute;left:14px;bottom:10px;font-size:11.5px;color:var(--mut);opacity:.75;pointer-events:none}

/* ---------- panel ---------- */
#panel{background:var(--panel);border-left:1px solid var(--line);overflow-y:auto;min-height:0;scroll-behavior:smooth}
.phead{padding:16px 18px 10px;position:sticky;top:0;background:linear-gradient(180deg,var(--panel) 80%,rgba(15,27,63,0));z-index:2}
.pmeta{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--mut)}
.slidebadge{background:var(--gold);color:#111;font-weight:700;border-radius:6px;padding:1px 8px}
#stepTitle{font-size:19px;color:var(--gold);margin:8px 0 6px;line-height:1.25}
#stepIntro{margin:0;color:#c9d6ff;font-size:13.5px}
#lines{padding:4px 18px 40px;display:flex;flex-direction:column;gap:12px}
.ln{display:none;border:1px solid var(--line);border-radius:12px;padding:10px 12px;background:rgba(255,255,255,.035)}
.ln.show{display:block;animation:rise .45s ease both}
.cap{font-size:12.5px;color:var(--mut);margin-bottom:6px}
.sy,.nm,.rs{overflow-x:auto;overflow-y:hidden;padding:2px 0}
.sy{font-size:1.02em}
.nm,.rs{opacity:0}
.ln.show .nm{animation:fade .5s .55s ease forwards;color:#cfe0ff}
.ln.show .rs{animation:pop .6s 1.15s ease forwards;color:var(--gold);font-size:1.06em;background:rgba(255,210,63,.09);border-left:3px solid var(--gold);padding:4px 10px;border-radius:0 8px 8px 0;margin-top:4px}
.ln.instant .nm,.ln.instant .rs,.ln.instant{animation-delay:0s!important;animation-duration:.01s!important}
.ln.show.instant .nm,.ln.show.instant .rs{opacity:1}
.nt{font-size:13.5px}
.hl{color:var(--gold);font-weight:600}
.ln.note{border-style:dashed}
.ck{display:grid;gap:4px;padding:6px 8px;border-radius:8px;margin-top:6px;border:1px solid}
.ck.ok{border-color:rgba(123,216,143,.4);background:rgba(123,216,143,.07)}
.ck.bad{border-color:rgba(255,93,108,.5);background:rgba(255,93,108,.09)}
.badge{font-weight:700;font-size:12px;margin-right:6px}
.ck.ok .badge{color:var(--green)} .ck.bad .badge{color:var(--red)}
.ckt{font-size:12.5px;color:#cdd8ff}
.tw{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:12px;font-variant-numeric:tabular-nums}
th{color:var(--gold);font-weight:600;text-align:right;padding:4px 6px;border-bottom:1px solid var(--line);white-space:nowrap}
td{text-align:right;padding:3px 6px;border-bottom:1px solid rgba(255,255,255,.05)}
tbody tr{opacity:0;transform:translateX(10px);transition:opacity .3s,transform .3s}
tbody tr.on{opacity:1;transform:none}
table.sch tbody tr{opacity:1;transform:none}
table.sch td.mk{color:var(--gold);text-align:center;font-size:15px}
table.sch td:nth-child(2),table.sch td:nth-child(3),table.sch th:nth-child(2),table.sch th:nth-child(3){text-align:left}
tr.tot td{font-weight:700;color:var(--gold);border-top:1px solid var(--gold)}
.cmp .sub{color:var(--mut);font-size:12.5px;margin-top:6px}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
@keyframes fade{from{opacity:0}to{opacity:1}}
@keyframes pop{0%{opacity:0;transform:scale(.97)}60%{opacity:1;transform:scale(1.015)}100%{opacity:1;transform:none}}

/* ---------- nhãn 3D ---------- */
.lbl{font:600 12px/1.25 "Segoe UI",Roboto,Arial,sans-serif;color:#eaf1ff;background:rgba(7,14,36,.78);border:1px solid rgba(255,255,255,.2);
  padding:2px 7px;border-radius:7px;white-space:nowrap;pointer-events:none;transform:translateY(-50%);backdrop-filter:blur(3px);
  box-shadow:0 2px 8px rgba(0,0,0,.35)}
.lbl b{font-weight:800}
.lbl.dim{color:var(--gold);border-color:rgba(255,210,63,.55)}
.lbl.gold{color:var(--gold);border-color:rgba(255,210,63,.6)}
.lbl.red{color:#ff9aa4;border-color:rgba(255,93,108,.6)}
.lbl.blue{color:#8be0fb;border-color:rgba(76,201,240,.6)}
.lbl.orange{color:#ffc46b;border-color:rgba(255,159,28,.65)}
.lbl.green{color:var(--green);border-color:rgba(123,216,143,.6)}
.lbl.teal{color:#7ee8dc;border-color:rgba(46,196,182,.65)}
.lbl.soft{font-weight:500;color:#c8d4f5;background:rgba(7,14,36,.55);border-color:rgba(255,255,255,.12)}
.lbl.layer{font-weight:500;font-size:11.5px;background:rgba(60,40,15,.7);border-color:rgba(210,180,140,.5);color:#ffe9c7;line-height:1.3;transform:translate(0,-50%)}
.lbl.layer span{color:#d8c29a;font-weight:400}
.lbl.pmax{color:#ff9aa4;border-color:rgba(255,93,108,.7)} .lbl.pmin{color:#8be0fb;border-color:rgba(76,201,240,.7)}
.lbl.pmean{color:#fff;border-color:rgba(255,255,255,.5)}
.lbl.node{font-size:10.5px;padding:0 4px;background:rgba(7,14,36,.55);border-color:transparent;font-weight:600}
.lbl.node.blue{color:#8be0fb}.lbl.node.red{color:#ff9aa4}.lbl.node.soft{color:#c8d4f5}
.lbl.sec{font-size:13px;color:#fff;background:rgba(255,255,255,.14)}
.lbl.tag{font-size:12px;padding:2px 8px 2px 4px;display:flex;gap:5px;align-items:center}
.lbl.tag i{font-style:normal;display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;background:#fff;color:#111;font-weight:800;font-size:13px}
.lbl.t1{border-color:#ff9f1c}.lbl.t2{border-color:#2ec4b6}.lbl.t3{border-color:#ffd23f}.lbl.t4{border-color:#ff5d6c}.lbl.t5{border-color:#b197fc}
.lbl .red{color:#ff9aa4}.lbl .blue{color:#8be0fb}.lbl .green{color:#7bd88f}
body.nolabels .lbl{display:none!important}

/* ---------- timeline ---------- */
.timeline{display:flex;align-items:center;gap:18px;padding:10px 18px 12px;background:linear-gradient(0deg,#0a1334,#0c1740);border-top:1px solid var(--line)}
.ctl{display:flex;align-items:center;gap:8px}
.btn.round{width:38px;height:38px;border-radius:50%;padding:0;display:grid;place-items:center}
.btn.round.big{width:46px;height:46px;background:var(--gold);color:#111;border-color:var(--gold);font-size:16px}
.lc{font-size:12px;color:var(--mut);min-width:34px;text-align:center}
.track{flex:1;min-width:0}
.tltitle{font-size:12.5px;color:var(--mut);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:2px}
#slider{width:100%;-webkit-appearance:none;appearance:none;height:8px;border-radius:99px;outline:none;
  background:linear-gradient(90deg,var(--gold) var(--pct,0%),rgba(255,255,255,.14) var(--pct,0%))}
#slider::-webkit-slider-thumb{-webkit-appearance:none;width:22px;height:22px;border-radius:50%;background:#fff;border:4px solid var(--gold);cursor:grab;box-shadow:0 0 0 6px rgba(255,210,63,.18)}
#slider::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#fff;border:4px solid var(--gold)}
.dots{display:flex;justify-content:space-between;margin-top:6px;padding:0 1px}
.dot{width:24px;height:24px;border-radius:50%;border:1px solid var(--line);background:rgba(255,255,255,.05);font-size:11px;color:var(--mut);display:grid;place-items:center;padding:0;transition:.25s}
.dot:hover{border-color:var(--gold);color:#fff}
.dot.done{background:rgba(255,210,63,.18);color:var(--gold);border-color:rgba(255,210,63,.4)}
.dot.on{background:var(--gold);color:#111;font-weight:800;transform:scale(1.2)}

/* ---------- drawer ---------- */
#drawer{position:fixed;right:-520px;top:54px;bottom:0;width:min(480px,94vw);background:#0b1636;border-left:2px solid var(--gold);padding:14px 16px;overflow:auto;z-index:20;transition:right .3s ease;box-shadow:-10px 0 30px rgba(0,0,0,.4)}
#drawer.open{right:0}
.dh{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;color:var(--gold)}
.x{background:none;border:0;font-size:18px}
#form{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}
.fld label{display:block;font-size:12px;color:var(--mut);margin-bottom:3px}
.fld.wide{grid-column:1/-1}
.fld input,.fld select{width:100%;background:#0f1b3f;color:var(--tx);border:1px solid var(--line);border-radius:7px;padding:6px 8px;font:inherit}
.fld input:focus,.fld select:focus{outline:2px solid var(--gold)}
.btn.wide{width:100%}
#drawer .note{color:var(--mut);font-size:12px}

.lbl.water{background:rgba(20,80,160,.75);border-color:rgba(120,190,255,.7);color:#d8efff;font-weight:600}
.cutbox{display:flex;align-items:center;gap:8px;padding:3px 8px;border:1px solid var(--line);border-radius:9px;background:rgba(255,255,255,.04);font-size:12px}
.cutbox select{background:#0f1b3f;color:var(--tx);border:1px solid var(--line);border-radius:6px;padding:3px 5px;font:inherit}
.cutbox .cs{display:flex;align-items:center;gap:4px;color:var(--mut)}
.cutbox input[type=range]{width:70px}
.cutbox.off .cs,.cutbox.off .chk{opacity:.35;pointer-events:none}
/* ---------- chart + form lớp đất ---------- */
.cw{margin-top:6px}
.epc{width:100%;height:auto;display:block}
.epc .bg{fill:rgba(255,255,255,.03);stroke:var(--line)}
.epc .gx{stroke:rgba(255,255,255,.1);stroke-width:1}
.epc .tk{fill:#9fb0d8;font-size:10px}
.epc .ax{fill:#cfe0ff;font-size:11px}
.epc .lg{fill:#e6eeff;font-size:11px}
.epc .sn{fill:#e6eeff;font-size:9px}
.epc .pts{transition:opacity .3s}
.layers>label{font-weight:600;color:var(--gold)!important}
.lyr{border:1px solid var(--line);border-radius:10px;padding:8px;margin-top:8px;background:rgba(255,255,255,.03)}
.lyr .lh{display:flex;gap:6px;align-items:center;margin-bottom:6px;color:var(--gold)}
.lyr .lh .nm{flex:1;opacity:1}
.lyr .lh .rm{background:none;border:0;color:var(--red);font-size:15px;cursor:pointer}
.lyr .lg{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.lyr .lg.ep{grid-template-columns:repeat(5,1fr);margin-top:6px}
.lyr .lg .sub{grid-column:1/-1}
.lyr label{font-size:11px;color:var(--mut);display:block;margin:0}
.lyr input,.lyr select{width:100%;background:#0f1b3f;color:var(--tx);border:1px solid var(--line);border-radius:6px;padding:4px 6px;font:inherit;font-size:12px}
.lyr .gr{margin-top:6px}
.lt{width:100%;font-size:12px}
.lt tbody tr{opacity:1;transform:none}
.lt th{color:var(--mut);font-weight:500;text-align:left;padding:2px 4px}
.lt td{padding:2px 3px}
.lt input{width:100%;background:#0f1b3f;color:var(--tx);border:1px solid var(--line);border-radius:6px;padding:4px 6px;font:inherit}
.fld .mini{width:56px;display:inline-block;padding:2px 6px}
.sub{font-size:11.5px;color:var(--mut);margin:4px 0 0}
.err{color:var(--red);font-size:12.5px;grid-column:1/-1;margin:0}
.btn.ghost{background:transparent;border:1px dashed var(--line);color:var(--tx);margin-top:8px}
/* ---------- responsive ---------- */
@media (max-width:980px){
  body{overflow:auto;display:block}
  main{grid-template-columns:1fr;grid-template-rows:56vh auto}
  #panel{max-height:none}
  .brand small{display:none}
  .timeline{position:sticky;bottom:0;z-index:6}
  .tools{gap:6px}
}

/* ---- Bảng tính lún tách 2 bảng theo mẫu thuyết minh (ô gộp lớp đất, S tổng) ---- */
table.stl{border:1px solid var(--line)}
table.stl th,table.stl td{text-align:center;border:1px solid rgba(255,255,255,.13);padding:3px 5px}
table.stl th{white-space:normal;line-height:1.15;vertical-align:middle}
table.stl td.lay,table.stl td.sum{vertical-align:middle;font-weight:600;color:var(--gold)}
table.stl tbody td.sum{opacity:0;transition:opacity .35s}
table.stl tbody td.sum.late-on{opacity:1}
table.stl tfoot{opacity:0;transition:opacity .35s}
table.stl tfoot.on{opacity:1}
table.stl tfoot td{font-weight:700;color:var(--gold);border-top:1px solid var(--gold)}
table.stl tfoot td.tlbl{text-align:right}