:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --ink: #1b1f24;
  --muted: #5d6673;
  --line: #d9dde3;
  --accent: #b23a1e;
  --accent-ink: #ffffff;
  --ok: #2e7d32;
  --warn: #b26a00;
  --err: #c62828;
  --hl: #ff9800;
  --radius: 6px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--ink);
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); }
button, input, select, textarea { font: inherit; color: inherit; }
button {
  border: 1px solid var(--line); background: var(--panel); border-radius: var(--radius);
  padding: 6px 12px; cursor: pointer;
}
button:hover { border-color: #aab1bb; }
button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.primary:hover { filter: brightness(1.05); }
button.ghost { background: transparent; border-color: transparent; }
button.active { background: #1b1f24; color: #fff; border-color: #1b1f24; }
button:disabled { opacity: .5; cursor: default; }
input, select, textarea {
  border: 1px solid var(--line); border-radius: 4px; padding: 5px 7px; background: #fff; width: 100%;
}
textarea { font-family: var(--mono); font-size: 12px; resize: vertical; }
label { display: block; font-size: 12px; color: var(--muted); margin: 6px 0 2px; }
h2 { font-size: 15px; margin: 0 0 8px; }
h3 { font-size: 13px; margin: 14px 0 6px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
table { border-collapse: collapse; width: 100%; font-size: 12px; }
th, td { text-align: left; padding: 4px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; background: #fafbfc; position: sticky; top: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr.sel td { background: #fff3e0; }
tr.click { cursor: pointer; }
tr.click:hover td { background: #f7f8fa; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.mono { font-family: var(--mono); }
.row { display: flex; gap: 8px; align-items: end; }
.row > * { flex: 1; }
.row > .fit { flex: 0 0 auto; }
[hidden] { display: none !important; }

/* top bar */
.topbar {
  height: 48px; display: flex; align-items: center; gap: 16px; padding: 0 16px;
  background: #1b1f24; color: #fff;
}
.topbar button.ghost { color: #fff; }
.brand { display: flex; align-items: center; gap: 8px; font-size: 15px; white-space: nowrap; }
.brand .mark {
  display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 5px;
  background: var(--accent); font-weight: 700; font-size: 12px;
}
.crumbs { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #c9ced6; }
.crumbs a { color: #fff; text-decoration: none; }
.top-actions { display: flex; align-items: center; gap: 8px; }
.who { font-size: 12px; color: #c9ced6; }
.topbar button.lang { border: 1px solid #5d6673; font-weight: 600; letter-spacing: .04em; }
.view { height: calc(100% - 48px); }

/* login + projects */
.center { max-width: 920px; margin: 0 auto; padding: 32px 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 20px; }
.login { max-width: 380px; margin: 10vh auto; }
.login .card { display: grid; gap: 6px; }
.error { color: var(--err); font-size: 13px; min-height: 18px; }
.projects { display: grid; gap: 10px; }
.project {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; cursor: pointer;
}
.project:hover { border-color: #aab1bb; }

/* workspace */
.ws { display: grid; grid-template-columns: 300px 1fr 340px; grid-template-rows: 1fr auto; height: 100%; }
.ws-left, .ws-right { background: var(--panel); overflow: auto; padding: 12px; }
.ws-left { border-right: 1px solid var(--line); grid-row: 1 / span 2; }
.ws-right { border-left: 1px solid var(--line); grid-row: 1 / span 2; grid-column: 3; }
.ws-center { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.tabs { display: flex; gap: 4px; padding: 8px 8px 0; flex-wrap: wrap; }
.tabs button { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
.stage { flex: 1; min-height: 0; background: #fff; border-top: 1px solid var(--line); position: relative; overflow: hidden; }
.stage.scroll { overflow: auto; padding: 12px; }
.toolbar { display: flex; gap: 6px; align-items: center; padding: 6px 8px; flex-wrap: wrap; background: #fafbfc; border-bottom: 1px solid var(--line); font-size: 13px; }
.toolbar input { width: 80px; }
.toolbar .sep { width: 1px; height: 20px; background: var(--line); }
.actions { display: flex; gap: 6px; padding: 8px; flex-wrap: wrap; align-items: center; border-bottom: 1px solid var(--line); }
.dirty { color: var(--warn); font-size: 12px; }
.fieldset { border-top: 1px solid var(--line); padding-top: 4px; margin-top: 10px; }
.zone { border: 1px solid var(--line); border-radius: 6px; padding: 6px 8px; margin: 6px 0; }

/* plan viewer */
.viewer { position: absolute; inset: 0; }
.fw-wrap { position: absolute; inset: 0; display: flex; flex-direction: column; }
.fw-canvas { position: relative; flex: 1; min-height: 0; }
.projects { margin-top: 16px; }
.viewer svg, .fw-canvas svg { width: 100%; height: 100%; display: block; cursor: grab; touch-action: none; }
.viewer svg.dragging, .fw-canvas svg.dragging { cursor: grabbing; }
.fw-canvas svg.drawing { cursor: crosshair; }
.rebar-plan polygon, .rebar-plan polyline { fill: none; vector-effect: non-scaling-stroke; }
.rebar-plan .l-OUTLINE { stroke: #1a1a1a; stroke-width: 2px; }
.rebar-plan .l-OPENING { stroke: #1a1a1a; stroke-width: 1.4px; }
.rebar-plan .l-MESH { stroke: #2e7d32; stroke-width: .8px; }
.rebar-plan .l-BARS { stroke: #c62828; stroke-width: 2px; }
.rebar-plan .l-DISTRIBUTION { stroke: #c62828; stroke-width: .8px; }
.rebar-plan .l-EDGE { stroke: #1565c0; stroke-width: 1.4px; }
.rebar-plan .l-ZONE { stroke: #8e24aa; stroke-width: 1px; }
.rebar-plan .l-DIM, .rebar-plan .l-LABEL { stroke: #777; stroke-width: .7px; }
.rebar-plan .dash { stroke-dasharray: 6 4; }
.rebar-plan .t { font-size: .125px; fill: #1a1a1a; font-family: system-ui, Arial, sans-serif; }
.rebar-plan .hl { stroke: var(--hl) !important; stroke-width: 3px !important; }
.rebar-plan text.hl { fill: var(--hl); stroke: none !important; font-weight: 700; }
.overlay polygon, .overlay polyline, .overlay line { vector-effect: non-scaling-stroke; fill: none; }
.overlay .outline { stroke: #1565c0; stroke-width: 2px; fill: rgba(21, 101, 192, .08); }
.overlay .opening { stroke: #1565c0; stroke-width: 1.5px; }
.overlay .zone { stroke: #8e24aa; stroke-width: 1.5px; stroke-dasharray: 6 4; fill: rgba(142, 36, 170, .08); }
.overlay .draft { stroke: var(--hl); stroke-width: 2px; }
.overlay .snap { fill: var(--hl); }
.overlay .origin { stroke: var(--accent); stroke-width: 2px; }
.hint { position: absolute; left: 12px; bottom: 12px; background: rgba(27, 31, 36, .85); color: #fff; font-size: 12px; padding: 6px 10px; border-radius: 6px; pointer-events: none; }
.empty { display: grid; place-items: center; height: 100%; color: var(--muted); text-align: center; padding: 24px; }

/* checks */
.msg { font-size: 12px; padding: 6px 8px; border-radius: 5px; margin: 4px 0; border-left: 3px solid; background: #fafbfc; }
.msg.error { border-color: var(--err); background: #fdecea; color: inherit; }
.msg.warning { border-color: var(--warn); background: #fff4e5; }
.msg.info { border-color: #90a4ae; }
.totals { font-size: 12px; margin: 6px 0; }

/* report */
.toc td:first-child { font-family: var(--mono); white-space: nowrap; }
.chip { display: inline-block; font-size: 11px; padding: 2px 8px; border-radius: 10px; background: #eceff1; margin: 0 4px 4px 0; }
.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 10px 0; }
.thumb { border: 1px solid var(--line); border-radius: 6px; padding: 4px; background: #fff; font-size: 11px; cursor: zoom-in; }
.thumb img { width: 100%; display: block; }
.thumb.image-page { border-color: var(--warn); }
.pageview { position: fixed; inset: 0; background: rgba(0, 0, 0, .75); display: grid; place-items: center; z-index: 20; cursor: zoom-out; }
.pageview img { max-width: 95vw; max-height: 95vh; background: #fff; }

/* assistant */
.assistant { grid-column: 2; border-top: 1px solid var(--line); background: var(--panel); padding: 8px; }
.assistant form { display: flex; gap: 8px; }
.assistant .log { max-height: 120px; overflow: auto; font-size: 12px; margin-bottom: 6px; }
.assistant .log p { margin: 2px 0; }
.assistant .me { color: var(--muted); }
.proposal { background: #fff8e1; border: 1px solid #ffe082; border-radius: 6px; padding: 6px 8px; margin: 4px 0; }

.toast { position: fixed; right: 16px; bottom: 16px; background: #1b1f24; color: #fff; padding: 10px 14px; border-radius: 6px; font-size: 13px; z-index: 30; max-width: 420px; }
.toast.err { background: var(--err); }

@media (max-width: 1100px) {
  .ws { grid-template-columns: 260px 1fr; }
  .ws-right { grid-column: 1 / span 2; grid-row: auto; border-left: 0; border-top: 1px solid var(--line); max-height: 40vh; }
}
@media (max-width: 720px) {
  .ws { grid-template-columns: 1fr; grid-template-rows: auto; height: auto; }
  .ws-left, .ws-right, .assistant { grid-column: 1; grid-row: auto; }
  .ws-center { height: 70vh; }
}