:root{
  --bg:#0d0e10;
  --stage:#101215;
  --panel:#15171a;
  --panel-2:#1b1e22;
  --line:#26292e;
  --line-soft:#1f2226;
  --text:#e9eaec;
  --muted:#8b9096;
  --muted-2:#666b71;
  --accent:#f2b01e;
  --accent-dim:#b8850f;
  --ok:#4ea86b;
  --bad:#c0554a;
  --radius:10px;
  --font:"Inter","SF Pro Display",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font);font-size:14px;line-height:1.45;
  -webkit-font-smoothing:antialiased;
  display:flex;flex-direction:column;overflow:hidden;
}
button{font-family:inherit;color:inherit}

/* ---------- topbar ---------- */
.topbar{
  flex:0 0 auto;display:flex;align-items:center;gap:32px;
  padding:0 24px;height:58px;background:var(--panel);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;flex-direction:column;line-height:1}
.brand-name{font-weight:800;letter-spacing:.16em;font-size:15px}
.brand-sub{font-size:8px;letter-spacing:.22em;color:var(--muted-2);text-transform:uppercase;margin-top:3px}
.nav{display:flex;gap:26px;font-size:13px;color:var(--muted)}
.nav a{cursor:default}
.nav a.is-active{color:var(--accent)}
.topbar-right{margin-left:auto;display:flex;align-items:center;gap:18px}
.lang{display:flex;border:1px solid var(--line);border-radius:5px;overflow:hidden}
.lang button{background:none;border:0;padding:3px 8px;font-size:11px;color:var(--muted);cursor:pointer}
.lang button.is-active{background:var(--accent);color:#141414;font-weight:600}
.phone{font-size:12px;color:var(--muted)}

.btn{
  border:1px solid transparent;border-radius:7px;padding:9px 16px;
  font-size:13px;font-weight:600;cursor:pointer;background:none;
  transition:.15s background,.15s border-color,.15s color;
}
.btn-sm{padding:6px 12px;font-size:11px}
.btn-accent{background:var(--accent);color:#191400}
.btn-accent:hover{background:#ffc233}
.btn-ghost{border-color:var(--line);color:var(--muted)}
.btn-ghost:hover{border-color:var(--muted-2);color:var(--text)}
.btn:disabled{opacity:.35;cursor:not-allowed}

/* ---------- stepper ---------- */
.stepper{
  flex:0 0 auto;display:flex;align-items:stretch;
  background:var(--stage);border-bottom:1px solid var(--line);
}
.step{
  flex:1;display:flex;background:none;border:0;align-items:center;gap:9px;justify-content:center;
  padding:12px 8px;font-size:12px;color:var(--muted-2);
  border-bottom:2px solid transparent;cursor:pointer;
  transition:.15s color,.15s border-color;white-space:nowrap;
}
.step:hover{color:var(--muted)}
.step .num{
  width:19px;height:19px;border-radius:50%;flex:0 0 auto;
  display:grid;place-items:center;font-size:10px;font-weight:700;
  border:1px solid var(--line);color:var(--muted-2);
}
.step.is-done{color:var(--muted)}
.step.is-done .num{border-color:var(--accent-dim);color:var(--accent-dim)}
.step.is-active{color:var(--text);border-bottom-color:var(--accent)}
.step.is-active .num{background:var(--accent);border-color:var(--accent);color:#191400}

/* ---------- layout ---------- */
.layout{flex:1 1 auto;display:flex;min-height:0}

/* ---------- stage ---------- */
.stage{
  position:relative;flex:1 1 auto;min-width:0;
  background:radial-gradient(120% 90% at 50% 25%,#1a1d21 0%,#0d0e10 72%);
}
#viewport{position:absolute;inset:0}
#viewport canvas{display:block;width:100%;height:100%}

.stage-badge{
  position:absolute;top:14px;left:16px;z-index:3;
  font-size:10.5px;letter-spacing:.04em;color:var(--muted-2);
  background:rgba(13,14,16,.6);border:1px solid var(--line-soft);
  padding:4px 9px;border-radius:5px;backdrop-filter:blur(4px);
}

.view-controls{
  position:absolute;left:50%;transform:translateX(-50%);bottom:56px;z-index:3;
  display:flex;align-items:center;gap:6px;
}
.icon-btn{
  width:30px;height:30px;border-radius:7px;cursor:pointer;
  background:rgba(24,26,30,.85);border:1px solid var(--line);
  color:var(--muted);font-size:14px;backdrop-filter:blur(6px);
}
.icon-btn:hover{color:var(--text);border-color:var(--muted-2)}
#viewSelect{
  height:30px;min-width:132px;border-radius:7px;padding:0 10px;cursor:pointer;
  background:rgba(24,26,30,.85);border:1px solid var(--line);color:var(--text);
  font-family:inherit;font-size:12px;backdrop-filter:blur(6px);
}

.stage-tools{position:absolute;top:14px;right:16px;z-index:3;display:flex;flex-direction:column;gap:6px;align-items:flex-end}
.tool{
  border:1px solid var(--line);background:rgba(24,26,30,.85);color:var(--muted);
  border-radius:7px;padding:6px 11px;font-size:11.5px;cursor:pointer;backdrop-filter:blur(6px);
}
.tool:hover{color:var(--text);border-color:var(--muted-2)}
.tool.is-on{background:var(--accent);border-color:var(--accent);color:#191400;font-weight:600}
.tool[hidden]{display:none}

.specstrip{
  position:absolute;left:0;right:0;bottom:0;z-index:3;height:44px;
  display:flex;align-items:center;gap:26px;padding:0 18px;
  background:rgba(16,18,21,.92);border-top:1px solid var(--line);
  backdrop-filter:blur(8px);font-size:11.5px;color:var(--muted);overflow-x:auto;
}
.spec{display:flex;align-items:center;gap:7px;white-space:nowrap}
.spec b{color:var(--text);font-weight:600}
.specstrip .reset{margin-left:auto;background:none;border:0;color:var(--muted-2);cursor:pointer;font-size:11.5px}
.specstrip .reset:hover{color:var(--accent)}

.dim-layer{position:absolute;inset:0;z-index:2;pointer-events:none}
.dim-label{
  position:absolute;transform:translate(-50%,-50%);
  font-size:10.5px;color:#0f1114;background:var(--accent);
  padding:2px 6px;border-radius:4px;font-weight:600;white-space:nowrap;
}

/* ---------- panel ---------- */
.panel{
  flex:0 0 372px;display:flex;flex-direction:column;min-height:0;
  background:var(--panel);border-left:1px solid var(--line);
}
.panel-scroll{flex:1 1 auto;overflow-y:auto;padding:18px 16px 24px}
.panel-scroll::-webkit-scrollbar{width:9px}
.panel-scroll::-webkit-scrollbar-thumb{background:#2b2f34;border-radius:9px;border:3px solid var(--panel)}

.group{margin-bottom:20px}
.group-head{display:flex;align-items:baseline;gap:7px;margin-bottom:8px}
.group-title{font-size:12px;font-weight:600;letter-spacing:.01em}
.group-hint{
  font-size:10px;color:var(--muted-2);border:1px solid var(--line);
  width:14px;height:14px;border-radius:50%;display:grid;place-items:center;cursor:help;flex:0 0 auto;
}
.group-note{font-size:11px;color:var(--muted-2);margin:-4px 0 8px}

.opt{
  display:flex;align-items:center;gap:10px;width:100%;text-align:left;
  padding:9px 11px;margin-bottom:5px;cursor:pointer;
  background:var(--panel-2);border:1px solid var(--line-soft);border-radius:8px;
  transition:.13s border-color,.13s background;
}
.opt:hover{border-color:#343940}
.opt.is-on{border-color:var(--accent);background:#221d0f}
.opt.is-off{opacity:.4;cursor:not-allowed}
.opt.is-off:hover{border-color:var(--line-soft)}
.mark{
  width:14px;height:14px;border-radius:50%;flex:0 0 auto;
  border:1.5px solid #4a4f56;display:grid;place-items:center;
}
.mark.sq{border-radius:4px}
.opt.is-on .mark{border-color:var(--accent)}
.opt.is-on .mark::after{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}
.opt.is-on .mark.sq::after{border-radius:1px}
.opt .ico{width:34px;height:20px;flex:0 0 auto;opacity:.85}
.opt .txt{flex:1 1 auto;min-width:0}
.opt .lbl{font-size:12.5px;display:block}
.opt .sub{font-size:10.5px;color:var(--muted-2);display:block;margin-top:1px}
.opt .prc{font-size:11px;color:var(--muted);white-space:nowrap;flex:0 0 auto}
.opt.is-on .prc{color:var(--accent)}
.opt .why{font-size:10.5px;color:var(--bad);display:block;margin-top:2px}

.swatches{display:flex;gap:8px;flex-wrap:wrap}
.swatch{
  width:34px;height:34px;border-radius:8px;cursor:pointer;
  border:2px solid var(--line);padding:0;
}
.swatch.is-on{border-color:var(--accent)}

/* type cards */
.types{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.type-card{
  padding:11px;border-radius:9px;cursor:pointer;text-align:left;
  background:var(--panel-2);border:1px solid var(--line-soft);
  transition:.13s border-color,.13s background;
}
.type-card:hover{border-color:#343940}
.type-card.is-on{border-color:var(--accent);background:#221d0f}
.type-card .tname{font-size:12.5px;font-weight:600;display:block}
.type-card .tspec{font-size:10.5px;color:var(--muted-2);display:block;margin-top:3px;line-height:1.35}
.type-card .tprice{font-size:11px;color:var(--accent);display:block;margin-top:6px}

/* summary */
.sum-head{font-size:15px;font-weight:700;margin:2px 0 14px}
.sum-block{border:1px solid var(--line-soft);border-radius:9px;background:var(--panel-2);padding:12px;margin-bottom:12px}
.sum-row{display:flex;gap:12px;font-size:12px;padding:5px 0;border-bottom:1px solid #212428}
.sum-row:last-child{border-bottom:0}
.sum-row .k{color:var(--muted-2);flex:1 1 auto}
.sum-row .v{color:var(--text);text-align:right;flex:0 0 auto;max-width:58%}
.sum-row .p{color:var(--muted);width:78px;text-align:right;flex:0 0 auto}
.sum-total{display:flex;justify-content:space-between;align-items:baseline;padding-top:10px;margin-top:4px;border-top:1px solid var(--line)}
.sum-total .t{font-size:12px;color:var(--muted)}
.sum-total .v{font-size:19px;font-weight:700;color:var(--accent)}
.sum-sub{font-size:10.5px;color:var(--muted-2);margin-top:6px}

.field{display:block;margin-bottom:9px}
.field span{display:block;font-size:11px;color:var(--muted-2);margin-bottom:4px}
.field input,.field textarea{
  width:100%;background:#101215;border:1px solid var(--line);border-radius:7px;
  padding:9px 10px;color:var(--text);font-family:inherit;font-size:12.5px;
}
.field input:focus,.field textarea:focus{outline:0;border-color:var(--accent-dim)}
.dropzone{
  border:1px dashed #34383e;border-radius:8px;padding:14px;text-align:center;
  font-size:11.5px;color:var(--muted-2);cursor:pointer;
}
.dropzone:hover{border-color:var(--accent-dim);color:var(--muted)}
.filelist{font-size:11px;color:var(--muted);margin-top:7px}
.filelist div{padding:2px 0}

.panel-foot{
  flex:0 0 auto;border-top:1px solid var(--line);padding:12px 16px;
  display:flex;align-items:center;gap:12px;background:var(--panel);
}
.price{display:flex;flex-direction:column;line-height:1.2}
.price-label{font-size:10px;color:var(--muted-2)}
.price-value{font-size:19px;font-weight:700;letter-spacing:-.01em}
.foot-actions{margin-left:auto;display:flex;gap:8px}

.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);
  background:var(--accent);color:#191400;font-weight:600;font-size:13px;
  padding:11px 20px;border-radius:9px;opacity:0;pointer-events:none;
  transition:.25s opacity,.25s transform;z-index:50;
}
.toast.is-on{opacity:1;transform:translate(-50%,0)}

@media (max-width:1100px){
  .panel{flex-basis:330px}
  .nav{display:none}
}