/* ── Design tokens ── */
:root{
  --bg:#101e30;
  --panel:#16273f;
  --panel-2:#1d3350;
  --panel-3:#24405f;
  --line:#4a7aa8;
  --line-soft:rgba(96,150,200,0.16);
  --ink:#e7f1f8;
  --ink-dim:#8fadc9;
  --accent:#ffb454;
  --accent-ink:#2a1c08;
  --danger:#e05a5a;
  --ok:#4caf80;
  --sans:'Inter','Segoe UI',system-ui,sans-serif;
  --mono:'JetBrains Mono','Fira Mono','Consolas',monospace;
  --r:6px;
}

*{ box-sizing:border-box; margin:0; padding:0; }

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:13px;
  line-height:1.55;
  min-height:100vh;
}

/* ── Topbar ── */
.topbar{
  background:var(--panel);
  border-bottom:2px solid var(--line);
  position:sticky; top:0; z-index:100;
}
.topbar-inner{
  max-width:1600px; margin:0 auto;
  padding:0 20px;
  display:flex; align-items:center; gap:16px;
  height:52px;
}
.title-block{ display:flex; align-items:center; gap:10px; flex:1; min-width:0; }
.title-badge{
  font-family:var(--mono); font-size:11px; font-weight:700;
  background:var(--accent); color:var(--accent-ink);
  padding:3px 7px; border-radius:3px; letter-spacing:.05em;
  flex-shrink:0;
}
h1{ font-size:15px; font-weight:600; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
h1 span{ color:var(--ink-dim); font-weight:400; }

.topbar-actions{ display:flex; align-items:center; gap:8px; flex-shrink:0; }
#projectSelect{
  background:var(--panel-2); color:var(--ink);
  border:1px solid var(--line-soft); border-radius:var(--r);
  padding:5px 28px 5px 10px; font-size:12px; max-width:200px;
}

/* ── Layout ── */
main{ max-width:1600px; margin:0 auto; padding:20px; }
.layout{ display:grid; grid-template-columns:340px 1fr; gap:20px; align-items:start; }
@media(max-width:900px){ .layout{ grid-template-columns:1fr; } }

/* ── Cards / sidebar ── */
.sidebar{ display:flex; flex-direction:column; gap:14px; }
.card{
  background:var(--panel); border:1px solid var(--line-soft);
  border-radius:var(--r); overflow:hidden;
}
.card-head{
  padding:10px 14px;
  background:var(--panel-2);
  border-bottom:1px solid var(--line-soft);
  font-family:var(--mono); font-size:11px; font-weight:600;
  letter-spacing:.06em; text-transform:uppercase; color:var(--ink-dim);
  display:flex; align-items:center; gap:8px;
}
.step{
  background:var(--accent); color:var(--accent-ink);
  padding:1px 6px; border-radius:3px; font-size:10px;
}
.card > *:not(.card-head){ padding:14px; }

/* ── Fields ── */
.field{ display:flex; flex-direction:column; gap:4px; }
.field-row{ display:flex; gap:8px; }
.field-row .field{ flex:1; min-width:0; }
.field-unit{ flex:0 0 72px !important; }
label{ font-size:11px; color:var(--ink-dim); font-weight:500; }
.dim{ font-weight:400; }
input[type=number], input[type=text], select{
  background:var(--panel-3); color:var(--ink);
  border:1px solid var(--line-soft); border-radius:var(--r);
  padding:7px 10px; font-size:13px; width:100%;
}
input:focus, select:focus{ outline:2px solid var(--accent); outline-offset:1px; border-color:transparent; }
.hint{ font-size:11px; color:var(--ink-dim); line-height:1.5; margin-top:4px; }

/* ── Toggles ── */
.toggle-row{ padding:10px 14px 0; }
.toggle{ display:flex; align-items:center; gap:8px; cursor:pointer; font-size:12px; }
.toggle input{ width:14px; height:14px; accent-color:var(--accent); }
.collapsible{ display:none; padding:10px 14px 0; border-top:1px solid var(--line-soft); margin-top:10px; }
.collapsible.open{ display:block; }

/* ── Buttons ── */
.btn{
  padding:7px 14px; border-radius:var(--r); border:none; cursor:pointer;
  font-family:var(--sans); font-size:12px; font-weight:600; letter-spacing:.03em;
  transition:opacity .15s;
}
.btn:disabled{ opacity:.4; cursor:default; }
.btn:hover:not(:disabled){ opacity:.85; }
.btn-primary{ background:var(--accent); color:var(--accent-ink); }
.btn-ghost{ background:var(--panel-3); color:var(--ink); border:1px solid var(--line-soft); }
.btn-inline{
  background:none; border:1px solid var(--line-soft); color:var(--ink-dim);
  padding:3px 9px; border-radius:var(--r); cursor:pointer; font-size:11px;
  margin-left:auto;
}
.btn-inline:hover{ border-color:var(--accent); color:var(--accent); }
.btn-icon{
  background:none; border:none; cursor:pointer; color:var(--ink-dim);
  padding:3px 6px; border-radius:3px; font-size:12px;
}
.btn-icon:hover{ color:var(--danger); }

.calc-footer{ display:flex; flex-direction:column; gap:8px; }

/* ── Layer cards ── */
.layer-card{
  border:1px solid var(--line-soft); border-radius:var(--r);
  overflow:hidden; margin-top:10px;
}
.layer-head{
  display:flex; align-items:center; gap:8px; padding:8px 12px;
  background:var(--panel-2); border-bottom:1px solid var(--line-soft);
}
.layer-name{
  flex:1; background:none; border:none; color:var(--accent);
  font-family:var(--mono); font-size:12px; font-weight:600; outline:none;
}
.layer-name:focus{ border-bottom:1px solid var(--accent); }
.layer-formats{ padding:10px 12px; }
.layer-formats .field{ margin-top:8px; }

/* Format table */
.fmt-table{ width:100%; border-collapse:collapse; font-size:12px; }
.fmt-table th{ color:var(--ink-dim); font-weight:500; padding:3px 6px; text-align:left; }
.fmt-table td{ padding:3px 4px; }
.fmt-table input{ padding:5px 7px; font-size:12px; }
.fmt-table .fmt-label{ width:120px; }
.fmt-table .fmt-length,.fmt-table .fmt-width{ width:70px; }

/* ── Results area ── */
.content{ min-height:400px; }
.empty-state{
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  min-height:380px; color:var(--ink-dim); gap:12px;
}
.empty-icon{ font-size:48px; opacity:.3; }
.empty-state p{ font-size:13px; }

/* ── Spinner ── */
.spinner{
  display:inline-block; width:18px; height:18px;
  border:2px solid var(--line-soft); border-top-color:var(--accent);
  border-radius:50%; animation:spin .7s linear infinite;
  vertical-align:middle; margin-right:6px;
}
@keyframes spin{ to{ transform:rotate(360deg); } }

/* ── Result layout ── */
.result-tabs{
  display:flex; gap:4px; flex-wrap:wrap; margin-bottom:16px;
}
.rtab{
  padding:6px 14px; border-radius:var(--r) var(--r) 0 0;
  border:1px solid var(--line-soft); border-bottom:none;
  background:var(--panel-2); color:var(--ink-dim);
  cursor:pointer; font-size:12px; font-weight:600;
}
.rtab.active{ background:var(--panel); color:var(--accent); border-color:var(--accent); }
.rtab.overlay-tab{ border-color:var(--line-soft); }
.rtab.overlay-tab.active{ color:var(--ink); border-color:var(--accent); }

.layer-result{ display:none; }
.layer-result.visible{ display:block; }

/* Combo badge */
.combo-badge{
  display:inline-flex; gap:6px; flex-wrap:wrap;
  font-family:var(--mono); font-size:11px; color:var(--ink-dim);
  margin-bottom:12px;
}
.combo-badge span{
  background:var(--panel-2); border:1px solid var(--line-soft);
  padding:2px 8px; border-radius:3px;
}

/* Stats row */
.stats-row{
  display:flex; flex-wrap:wrap; gap:10px; margin-bottom:16px;
}
.stat-box{
  background:var(--panel); border:1px solid var(--line-soft);
  border-radius:var(--r); padding:10px 16px; flex:1; min-width:120px;
}
.stat-box .label{ font-size:10px; color:var(--ink-dim); text-transform:uppercase; letter-spacing:.06em; }
.stat-box .value{ font-size:20px; font-family:var(--mono); color:var(--accent); font-weight:700; }
.stat-box .sub{ font-size:11px; color:var(--ink-dim); }

/* Plan SVG */
.plan-wrap{ background:var(--panel); border:1px solid var(--line-soft); border-radius:var(--r); padding:16px; margin-bottom:16px; }
svg.planSvg{ width:100%; height:auto; display:block; }

/* SVG piece styles (applied as SVG class attributes) */
.room-bg{ fill:#1d3350; }
.room-outline{ fill:none; stroke:#4a7aa8; stroke-width:2; vector-effect:non-scaling-stroke; }
.part-full{ stroke-width:1; vector-effect:non-scaling-stroke; }
.part-cut{ stroke-width:1.5; stroke-dasharray:5 4; vector-effect:non-scaling-stroke; }
.cut-label{
  font-family:'JetBrains Mono','Consolas',monospace; font-weight:600;
  fill:#e7f1f8; text-anchor:middle; dominant-baseline:central; pointer-events:none;
}
.cut-label.on-light{ fill:#2a2a2a; }
.dim-line{ stroke:#8fadc9; stroke-width:1; vector-effect:non-scaling-stroke; }
.dim-label{
  font-family:'JetBrains Mono','Consolas',monospace; font-size:inherit;
  fill:#8fadc9; text-anchor:middle; dominant-baseline:central;
}
.leader-line{ stroke:#ffb454; stroke-width:1; vector-effect:non-scaling-stroke; opacity:.85; }
.leader-dot{ fill:#ffb454; }
.leader-label{
  font-family:'JetBrains Mono','Consolas',monospace; font-weight:600; fill:#ffb454; dominant-baseline:central;
}

/* Parts list */
.parts-card{
  background:var(--panel); border:1px solid var(--line-soft); border-radius:var(--r);
  overflow:hidden; margin-bottom:16px;
}
.parts-title{
  background:#1a1a1a; color:#fff; padding:9px 16px;
  font-size:11px; text-transform:uppercase; letter-spacing:.08em; font-weight:600;
}
.parts-table{ width:100%; border-collapse:collapse; }
.parts-table th{ padding:7px 12px; text-align:left; font-size:11px; color:var(--ink-dim); font-weight:500; background:var(--panel-2); border-bottom:1px solid var(--line-soft); }
.parts-table td{ padding:7px 12px; border-bottom:1px solid var(--line-soft); font-size:12px; }
.parts-table tr:last-child td{ border-bottom:none; }
.parts-table .pos-num{ font-family:var(--mono); font-weight:700; color:var(--accent); }
.parts-table .count{ font-family:var(--mono); font-weight:700; text-align:right; }
.swatch{ display:inline-block; width:10px; height:10px; border-radius:2px; margin-right:6px; vertical-align:middle; }

/* Joint report */
.joint-box{
  padding:12px 14px; border-radius:var(--r); margin-bottom:16px;
  border:1px solid var(--line-soft);
}
.joint-box.ok{ border-color:var(--ok); background:rgba(76,175,128,.06); color:var(--ok); }
.joint-box.warn{ border-color:var(--danger); background:rgba(224,90,90,.06); color:var(--danger); }
.joint-box h4{ font-size:12px; margin-bottom:4px; }
.joint-box p{ font-size:11px; color:var(--ink-dim); }
.joint-box.warn p{ color:var(--ink); }

/* Overlay toggle row */
.overlay-toggles{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:14px; }
.overlay-toggle{
  display:flex; align-items:center; gap:6px; font-size:11px; font-family:var(--mono);
  background:var(--panel-2); border:1px solid var(--line-soft); border-radius:var(--r);
  padding:5px 10px; cursor:pointer; user-select:none;
}
.overlay-toggle input{ width:13px; height:13px; accent-color:var(--accent); cursor:pointer; }