:root{
  --bg:#0e1116; --bg2:#141922; --panel:#171d27; --line:#232c3a;
  --txt:#e8edf5; --muted:#8b98ab; --accent:#6c8cff; --accent2:#9b6cff;
  --ok:#37d67a; --warn:#ffb020; --bad:#ff5c72;
}
*{box-sizing:border-box}
html,body{margin:0;background:linear-gradient(180deg,#0b0e13,#0e1116 40%);color:var(--txt);
  font-family:"Segoe UI",Roboto,Inter,system-ui,sans-serif;min-height:100%}
h1{font-size:18px;margin:0}
h2{font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 12px}
h3{font-size:13px;color:var(--muted);margin:18px 0 8px;text-transform:uppercase;letter-spacing:.06em}

.topbar{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;
  padding:16px 22px;background:rgba(20,25,34,.85);border-bottom:1px solid var(--line);
  position:sticky;top:0;backdrop-filter:blur(8px);z-index:5}
.brand{display:flex;gap:12px;align-items:center}
.logo{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-weight:700;
  background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;box-shadow:0 6px 18px rgba(108,140,255,.35)}
.sub{margin:2px 0 0;color:var(--muted);font-size:12px}
.toolbar{display:flex;flex-wrap:wrap;gap:8px}

.btn{border:1px solid transparent;border-radius:10px;padding:10px 16px;font-size:13px;font-weight:600;
  color:#fff;cursor:pointer;background:linear-gradient(135deg,var(--accent),var(--accent2));
  transition:transform .12s ease,box-shadow .2s ease,filter .2s ease}
.btn:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(108,140,255,.35)}
.btn:active{transform:scale(.97)}
.btn.ghost{background:#1c2330;border-color:var(--line);color:var(--txt)}
.btn.ghost:hover{box-shadow:0 8px 18px rgba(0,0,0,.35);border-color:#33405a}
.btn.full{width:100%;margin-top:14px}
.btn[disabled]{opacity:.5;cursor:progress}

.statusbar{display:flex;gap:14px;align-items:center;padding:10px 22px;font-size:12.5px;color:var(--muted);
  border-bottom:1px solid var(--line)}
.status.ok{color:var(--ok)} .status.err{color:var(--bad)} .source{color:var(--accent)}

.layout{display:grid;grid-template-columns:320px minmax(420px,1fr) 330px;gap:18px;padding:18px 22px 60px;align-items:start}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px}
.result{position:sticky;top:96px}
.hint{color:var(--muted);font-size:12px;margin:0 0 14px;line-height:1.5}

.field{margin-bottom:14px}
.field label{display:flex;justify-content:space-between;font-size:13px;margin-bottom:6px;color:#c7d2e2}
.field label b{color:var(--txt)}
input[type=range]{width:100%;-webkit-appearance:none;height:6px;border-radius:6px;
  background:linear-gradient(90deg,var(--accent),var(--accent2));outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;
  background:#fff;border:3px solid var(--accent);cursor:pointer;transition:transform .12s}
input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.15)}
.scale{display:flex;justify-content:space-between;font-size:10.5px;color:var(--muted);margin-top:4px}
.field.check label{justify-content:flex-start;gap:8px;cursor:pointer}
input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer}
input[type=text]{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line);
  background:#0f141c;color:var(--txt);font-size:13px}

.sections{display:flex;flex-direction:column;gap:14px;max-height:66vh;overflow:auto;padding-right:6px}
.sec{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#12171f;flex:0 0 auto}
.sec>header{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;
  background:#161d27;cursor:pointer;font-weight:600;font-size:13px}
.sec>header .sum{color:var(--accent);font-variant-numeric:tabular-nums}
.sec .items{padding:6px 10px 10px}
.item{display:grid;grid-template-columns:22px 1fr 84px;gap:10px;align-items:center;
  padding:7px 6px;border-bottom:1px dashed #1e2635;font-size:12.5px}
.item:last-child{border-bottom:none}
.item .nm{color:#cfd8e6;line-height:1.35}
.item .nm small{display:block;color:var(--muted);font-size:11px}
.item .qty{width:100%;padding:5px 7px;border-radius:8px;border:1px solid var(--line);
  background:#0f141c;color:var(--txt);font-size:12px;text-align:right}
.tag{font-size:10px;padding:2px 7px;border-radius:20px;border:1px solid var(--line);color:var(--muted);margin-left:6px}
.tag.ob{color:var(--ok);border-color:#245c3c} .tag.opt{color:var(--warn);border-color:#5c4a24}

.total{display:flex;justify-content:space-between;align-items:baseline;padding:12px 0;border-bottom:1px solid var(--line)}
.total b{font-size:26px;background:linear-gradient(135deg,#fff,#9db4ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.perM2{display:flex;justify-content:space-between;padding:10px 0;font-size:14px;color:#cdd7e6}
.perM2 b{color:var(--ok);font-size:18px}
.mini{display:grid;gap:8px;margin:12px 0 4px;font-size:12.5px;color:var(--muted)}
.mini div{display:flex;justify-content:space-between}
.mini b{color:var(--txt)}
.breakdown{display:grid;gap:6px;font-size:12px}
.breakdown .row{display:grid;grid-template-columns:1fr auto;gap:8px;color:#c7d2e2}
.breakdown .bar{height:6px;border-radius:6px;background:#1e2635;overflow:hidden;grid-column:1/-1}
.breakdown .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2))}

.modal{position:fixed;inset:0;background:rgba(6,9,14,.7);display:grid;place-items:center;z-index:20}
.modal[hidden]{display:none}
.modal-box{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px;width:min(560px,92vw)}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:16px}
.flash{animation:flash .7s ease}
@keyframes flash{0%{box-shadow:0 0 0 0 rgba(108,140,255,.7)}100%{box-shadow:0 0 0 18px rgba(108,140,255,0)}}
@media(max-width:1180px){.layout{grid-template-columns:1fr}.result{position:static}}