:root {
  --bg: #f4f6f9; --card: #fff; --text: #1d2430; --muted: #6b7686; --line: #dde2ea;
  --primary: #1f6feb; --primary-ink: #fff; --danger: #c93c37; --warn-bg: #fff4dd; --warn: #8a5a00;
  --zone: #2f9e44; --ext: #e8590c; --int: #1971c2; --win: #12b886; --door: #ae3ec9; --bg3d: #eef1f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c; --card: #1b2028; --text: #e6e9ee; --muted: #98a2b3; --line: #2c3440;
    --warn-bg: #3a2f14; --warn: #f2c66d; --bg3d: #1b2028;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); }
h2 { font-size: 18px; margin: 0 0 10px; }
h3 { font-size: 15px; margin: 0 0 8px; }
a { color: var(--primary); }
button, select, input { font: inherit; color: inherit; }
button { border: 1px solid var(--line); background: var(--card); padding: 7px 12px; border-radius: 8px; cursor: pointer; }
button:hover { border-color: var(--primary); }
button:disabled { opacity: .45; cursor: not-allowed; }
button.primary { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
button.ghost { background: transparent; }
button.danger { color: var(--danger); border-color: var(--danger); background: transparent; }
button.small, .small button { padding: 4px 9px; font-size: 13px; }
select, input[type=number], input[type=text] { border: 1px solid var(--line); border-radius: 7px; padding: 6px 8px; background: var(--card); min-width: 0; }
input[type=number] { width: 100px; }
input::placeholder { color: var(--muted); opacity: .8; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
label.check { flex-direction: row; align-items: center; gap: 6px; color: var(--text); }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.warn { background: var(--warn-bg); color: var(--warn); padding: 8px 10px; border-radius: 8px; margin: 6px 0; font-size: 13px; }
.warn-text { color: var(--warn); }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 20px; background: var(--card); border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 16px; }
.tag { font-size: 11px; font-weight: 600; color: var(--muted); border: 1px solid var(--line); border-radius: 99px; padding: 1px 7px; margin-left: 6px; vertical-align: 2px; }
.top-actions { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.unit-switch { flex-direction: row; align-items: center; gap: 6px; }
.admin-link { font-weight: 600; text-decoration: none; padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; }

.steps { display: flex; gap: 6px; padding: 10px 20px; overflow-x: auto; }
.steps button { white-space: nowrap; border-radius: 99px; }
.steps button.active { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }

main { padding: 0 20px 40px; max-width: 1500px; margin: 0 auto; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 14px; }
.actions { display: flex; justify-content: space-between; gap: 10px; margin: 14px 0; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.row.between { justify-content: space-between; }
.kv { display: flex; justify-content: space-between; gap: 10px; padding: 4px 0; border-bottom: 1px dashed var(--line); font-size: 13.5px; }
.kv span { color: var(--muted); }

.dropzone { display: block; text-align: center; border: 2px dashed var(--line); border-radius: 12px; padding: 34px 16px; cursor: pointer; color: var(--text); font-size: 15px; }
.dropzone.over, .dropzone:hover { border-color: var(--primary); }
.plan-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.plan-item { display: flex; gap: 10px; border: 1px solid var(--line); border-radius: 10px; padding: 10px; }
.plan-item img { width: 110px; height: 110px; object-fit: contain; background: #fff; border-radius: 6px; border: 1px solid var(--line); }
.plan-meta { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.plan-name { font-weight: 600; overflow-wrap: anywhere; }

.floor-tabs { display: flex; gap: 6px; margin: 4px 0 12px; flex-wrap: wrap; }
.floor-tabs button.active { background: var(--text); color: var(--card); border-color: var(--text); }

.measure { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 14px; }
@media (max-width: 980px) { .measure { grid-template-columns: 1fr; } }
.editor-card { padding: 10px; }
.editor-tools { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-bottom: 8px; }
.editor-tools button.active { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.editor-tools .sep { width: 1px; height: 22px; background: var(--line); margin: 0 4px; }
.editor-tools .hint { color: var(--muted); font-size: 12.5px; margin-left: 6px; }
.editor-canvas { background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; height: min(74vh, 900px); }
.plan-svg { width: 100%; height: 100%; display: block; touch-action: none; user-select: none; }
.wall { stroke-linecap: square; opacity: .55; cursor: pointer; }
.wall.ext { stroke: var(--ext); }
.wall.int { stroke: var(--int); }
.wall.sel { opacity: .85; stroke: #f03e3e; }
.wall.tmp { stroke: #f03e3e; opacity: .6; }
.wall-label { fill: #111; paint-order: stroke; stroke: #fff; stroke-width: 3px; stroke-opacity: .9; pointer-events: none; font-weight: 600; }
.opening { stroke-linecap: butt; opacity: .85; cursor: pointer; }
.opening.window { stroke: var(--win); }
.opening.door { stroke: var(--door); }
.opening.sel { stroke: #f03e3e; }
.zone { fill: var(--zone); fill-opacity: .14; stroke: var(--zone); stroke-opacity: .7; cursor: move; }
.zone.sel { fill-opacity: .24; stroke-opacity: 1; }
.zone.tmp { stroke-dasharray: 6 4; }
.zone-label { fill: #0b5d1e; font-weight: 700; paint-order: stroke; stroke: #fff; stroke-width: 3px; pointer-events: none; }
.handle { fill: #fff; stroke: #f03e3e; cursor: grab; }
.icon-btn { display: inline-flex; align-items: center; justify-content: center; padding: 5px 7px; line-height: 0; }
.icon-cell { width: 1%; text-align: right; }
.preview-dlg { width: min(900px, 94vw); border: 1px solid var(--line); border-radius: 12px; background: var(--card); color: var(--text); padding: 14px; }
.preview-dlg::backdrop { background: rgb(0 0 0 / .45); }
.pv-canvas { background: #fff; border: 1px solid var(--line); border-radius: 8px; height: min(62vh, 620px); overflow: hidden; margin: 8px 0; }
.pv-wall { stroke: #868e96; opacity: .35; stroke-linecap: square; }
.pv-target { stroke: #f03e3e; stroke-linecap: square; }
.pv-target-glow { stroke: #f03e3e; opacity: .22; stroke-linecap: round; }
.pv-end { fill: #fff; stroke: #f03e3e; stroke-width: 3; vector-effect: non-scaling-stroke; }
.cal-line { stroke: #f08c00; stroke-dasharray: 8 4; }
.side .card { margin-bottom: 12px; }
.side label { margin: 6px 0; }
.lg { display: inline-block; width: 12px; height: 8px; border-radius: 2px; margin: 0 2px 0 6px; }
.lg.ext { background: var(--ext); } .lg.int { background: var(--int); } .lg.win { background: var(--win); } .lg.door { background: var(--door); } .lg.zone { background: var(--zone); opacity: .6; }

.grid-form { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px 16px; align-items: end; margin-bottom: 10px; }
.grid-form input[type=number] { width: 100%; }
.tbl { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 13.5px; }
.tbl th, .tbl td { border-bottom: 1px solid var(--line); padding: 6px 8px; text-align: left; }
.tbl th { color: var(--muted); font-weight: 600; font-size: 12.5px; }
.tbl tr.total td { font-weight: 700; border-top: 2px solid var(--text); }
.tbl input[type=number] { width: 90px; }
details summary { cursor: pointer; margin-top: 10px; font-weight: 600; }

.stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 10px; }
.stat { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; }
.stat span { display: block; color: var(--muted); font-size: 12.5px; }
.stat b { font-size: 18px; }

.view3d { height: min(72vh, 760px); border-radius: 8px; overflow: hidden; border: 1px solid var(--line); }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--card); padding: 9px 16px; border-radius: 99px; z-index: 50; max-width: 90vw; }

/* admin */
.admin-table input[type=text] { width: 100%; min-width: 140px; }
.admin-table input[type=number] { width: 90px; }

@media print {
  .topbar, .steps, .actions, button { display: none !important; }
  details { display: block; } details > * { display: block; }
  .card { border: none; padding: 0; }
  body { background: #fff; color: #000; }
}
@media (max-width: 600px) {
  main, .topbar, .steps { padding-left: 12px; padding-right: 12px; }
  .editor-canvas { height: 60vh; }
}