:root {
  --bg: #f3f4f6; --panel: #ffffff; --panel2: #f8f9fb; --line: #e3e6ea; --line2: #d3d8de;
  --fg: #1c232b; --muted: #6a7480; --accent: #1f6feb; --accent-weak: #e4eefc; --ok: #1a7f4b; --warn: #b26a00;
  --danger: #c2372f; --shadow: 0 1px 2px rgba(16,24,40,.06), 0 4px 14px rgba(16,24,40,.06);
  --plan-bg: #fbfbfa; --plan-under: #c9ccd1; --wall: #3a4048; --sel: #ff7a1a;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15181c; --panel: #1d2126; --panel2: #23282e; --line: #2d333a; --line2: #3a414a;
    --fg: #e6e9ec; --muted: #98a2ad; --accent: #4c8dff; --accent-weak: #1f2d44; --ok: #3fbf7f; --warn: #e0a040;
    --danger: #ff6b62; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25);
    --plan-bg: #1a1d21; --plan-under: #3d434b; --wall: #cfd5dc; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
    --bg: #15181c; --panel: #1d2126; --panel2: #23282e; --line: #2d333a; --line2: #3a414a;
    --fg: #e6e9ec; --muted: #98a2ad; --accent: #4c8dff; --accent-weak: #1f2d44; --ok: #3fbf7f; --warn: #e0a040;
    --danger: #ff6b62; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.25);
    --plan-bg: #1a1d21; --plan-under: #3d434b; --wall: #cfd5dc; color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--fg);
  font: 14px/1.45 -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
button, input, select { font: inherit; color: inherit; }
.hidden { display: none !important; }
.spacer { flex: 1; }
.muted { color: var(--muted); }

/* ---------- header */
.top { height: 52px; display: flex; align-items: center; gap: 10px; padding: 0 14px; background: var(--panel);
  border-bottom: 1px solid var(--line); position: relative; z-index: 5; }
.brand { font-weight: 650; letter-spacing: .2px; display: flex; align-items: center; gap: 8px; white-space: nowrap; }
.logo { width: 26px; height: 26px; color: var(--fg); }
.wordmark { font-weight: 700; letter-spacing: 2px; }
.wordmark .w-light { font-weight: 300; }
.projname { border: 1px solid transparent; background: transparent; padding: 5px 8px; border-radius: 6px; min-width: 220px;
  font-weight: 600; }
.projname:hover:not(:disabled), .projname:focus { border-color: var(--line2); background: var(--panel2); outline: none; }
.pill { font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--panel2); border: 1px solid var(--line); }
.pill.ok { color: var(--ok); } .pill.warn { color: var(--warn); }
button { cursor: pointer; border-radius: 7px; border: 1px solid var(--line2); background: var(--panel); padding: 6px 12px; }
button:hover { background: var(--panel2); }
button:disabled { opacity: .45; cursor: default; }
button.primary, label.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover, label.primary:hover { filter: brightness(1.07); }
button.ghost { background: transparent; }
button.danger { color: var(--danger); }
button.icon { padding: 4px 8px; }
label.primary { display: inline-block; border-radius: 8px; padding: 9px 18px; cursor: pointer; font-weight: 600; }
label.big { font-size: 15px; }

/* ---------- start screen */
.start { display: grid; grid-template-columns: minmax(320px, 640px) minmax(260px, 420px); gap: 24px; justify-content: center;
  padding: 48px 16px; }
.drop { background: var(--panel); border: 2px dashed var(--line2); border-radius: 16px; padding: 48px 32px; text-align: center;
  box-shadow: var(--shadow); transition: border-color .15s, background .15s; }
.drop.over { border-color: var(--accent); background: var(--accent-weak); }
.drop h1 { font-size: 22px; margin: 8px 0; }
.drop-icon { font-size: 34px; color: var(--accent); }
.hint { color: var(--muted); font-size: 13px; margin-top: 18px; }
.recent { background: var(--panel); border-radius: 16px; padding: 18px; box-shadow: var(--shadow); }
.recent h3 { margin: 0 0 10px; font-size: 15px; }
.list { display: flex; flex-direction: column; gap: 6px; max-height: 60vh; overflow: auto; }
.item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border: 1px solid var(--line); border-radius: 9px;
  cursor: pointer; background: var(--panel); }
.item:hover { border-color: var(--accent); }
.item .t { font-weight: 600; } .item .s { color: var(--muted); font-size: 12px; }
@media (max-width: 900px) { .start { grid-template-columns: 1fr; } }

/* ---------- login / users */
.userbox { display: flex; align-items: center; gap: 6px; }
.badge { display: inline-block; min-width: 18px; padding: 0 5px; border-radius: 999px; background: #C8102E; color: #fff;
  font-size: 11px; font-weight: 700; text-align: center; }
.authscreen { display: flex; justify-content: center; padding: 64px 16px; }
.authcard { width: min(380px, 100%); background: var(--panel); border: 1px solid var(--line); border-radius: 16px;
  padding: 28px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 12px; }
.authcard h1 { margin: 0 0 4px; font-size: 22px; }
.authcard label, .pwform label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.authcard input, .pwform input { padding: 8px 10px; border: 1px solid var(--line2); border-radius: 8px; background: var(--panel2);
  color: var(--fg); font-size: 14px; }
.authcard button { padding: 9px; font-weight: 600; }
.authmsg { font-size: 13px; padding: 8px 10px; border-radius: 8px; background: var(--accent-weak); }
.authmsg.err { background: transparent; border: 1px solid var(--danger); color: var(--danger); }
.authswitch { margin: 0; font-size: 13px; color: var(--muted); text-align: center; }
.authswitch a { color: var(--accent); }
.pwform { display: flex; flex-direction: column; gap: 10px; }
.dlg.wide { width: min(720px, 94vw); }
.user { cursor: default; flex-wrap: wrap; }
.user:hover { border-color: var(--line); }
.user .who { flex: 1; min-width: 160px; }
.user .acts { display: flex; gap: 6px; flex-wrap: wrap; }
.user .acts button { padding: 4px 10px; font-size: 13px; }
.st { font-size: 11px; font-weight: 700; padding: 2px 7px; border-radius: 999px; border: 1px solid var(--line2); }
.st.pending { color: var(--warn); border-color: var(--warn); } .st.active { color: var(--ok); border-color: var(--ok); }
.st.rejected, .st.disabled { color: var(--danger); border-color: var(--danger); }
.st.adm { color: var(--accent); border-color: var(--accent); }
.appver { font-size: 11px; color: var(--muted); font-weight: 400; align-self: flex-end; margin: 0 0 3px -3px; }
.cnt { display: inline-block; min-width: 18px; padding: 0 5px; border-radius: 999px; background: #C8102E; color: #fff;
  font-size: 11px; font-weight: 700; line-height: 18px; text-align: center; vertical-align: 1px; }
.small { font-size: 12px; }

/* ---------- administration & bug reports */
.dlg-head { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; flex-wrap: wrap; }
.dlg-head h2 { margin: 0; }
.list.tall { max-height: 58vh; }
.newuser { display: flex; gap: 8px; margin-bottom: 10px; }
.newuser input { flex: 1; padding: 6px 10px; border: 1px solid var(--line2); border-radius: 7px; background: var(--panel2); }
.temppw { border: 1px solid var(--warn); background: color-mix(in srgb, var(--warn) 9%, var(--panel)); border-radius: 10px;
  padding: 10px 12px; margin-bottom: 10px; display: flex; flex-direction: column; gap: 4px; }
.temppw .pw { font: 600 20px/1.3 ui-monospace, Menlo, Consolas, monospace; letter-spacing: 1px; user-select: all; }
.temppw .acts, .ucard .acts, .fbcard .acts { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-top: 4px; }
.ucard { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: var(--panel); }
.ucard.pending { border-color: var(--warn); }
.uhead { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.uhead b { font-size: 15px; }
.ustats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px 12px; margin: 8px 0 6px; font-size: 13px; }
.ustats .k { color: var(--muted); font-size: 11px; }
@media (max-width: 640px) { .ustats { grid-template-columns: 1fr 1fr; } }
.ucard .acts button, .stbar button, .thead button { padding: 4px 10px; font-size: 13px; }
button.armed { background: var(--danger); border-color: var(--danger); color: #fff; }
.fbfilter { margin-bottom: 10px; }
.item.fb .grow { flex: 1; min-width: 0; }
.item.fb .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item.fb.unread .t::before { content: "● "; color: #C8102E; }
.st.fb-new { color: var(--accent); border-color: var(--accent); } .st.fb-progress { color: var(--warn); border-color: var(--warn); }
.st.fb-fixed { color: var(--ok); border-color: var(--ok); } .st.fb-wontfix { color: var(--danger); border-color: var(--danger); }
.dlg h3.sub { font-size: 14px; margin: 16px 0 8px; }
.composer { display: flex; flex-direction: column; gap: 6px; }
.composer textarea { width: 100%; resize: vertical; padding: 8px 10px; border: 1px solid var(--line2); border-radius: 8px;
  background: var(--panel2); color: var(--fg); font: inherit; }
.crow { display: flex; align-items: center; gap: 8px; }
.attach { font-size: 13px; color: var(--accent); cursor: pointer; padding: 4px 8px; border: 1px dashed var(--line2); border-radius: 7px; }
.attach:hover { border-color: var(--accent); }
.fname { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 260px; }
.thread { display: flex; flex-direction: column; gap: 8px; }
.thead { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.ctx { font-size: 12px; color: var(--muted); }
.ctx a { color: var(--accent); }
.ctx .ua { font-size: 11px; opacity: .8; word-break: break-all; }
.chat { display: flex; flex-direction: column; gap: 8px; max-height: 46vh; overflow: auto; padding: 10px; background: var(--panel2);
  border: 1px solid var(--line); border-radius: 10px; }
.msg { max-width: 82%; padding: 7px 10px; border-radius: 12px; background: var(--panel); border: 1px solid var(--line); }
.msg.me { align-self: flex-end; background: var(--accent-weak); border-color: transparent; }
.msg .meta { font-size: 11px; color: var(--muted); margin-bottom: 2px; }
.msg .txt { white-space: pre-wrap; word-wrap: break-word; }
.msg img { display: block; max-width: 100%; max-height: 260px; border-radius: 8px; margin-top: 6px; border: 1px solid var(--line); }
.ev { align-self: center; font-size: 12px; color: var(--muted); padding: 2px 10px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--panel); }
.stbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.stbar .seg button { font-size: 13px; padding: 4px 9px; }
.verin { width: 70px; padding: 4px 6px; border: 1px solid var(--line2); border-radius: 6px; background: var(--panel2); }
.fbcards { position: fixed; bottom: 16px; right: 16px; z-index: 40; display: flex; flex-direction: column; gap: 10px;
  width: min(360px, calc(100vw - 32px)); }
.fbcard { position: relative; background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--ok); border-radius: 10px;
  padding: 10px 12px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 4px; }
.fbcard.wontfix { border-left-color: var(--danger); }
.fbcard .s { font-size: 12px; color: var(--muted); }
.fbcard b { padding-right: 22px; }
.fbcard .x { position: absolute; top: 4px; right: 4px; border: 0; color: var(--muted); font-size: 12px; }

/* ---------- workspace */
.work { display: grid; grid-template-columns: 340px 1fr; height: calc(100vh - 52px); }
.side { background: var(--panel); border-right: 1px solid var(--line); display: flex; flex-direction: column; min-height: 0; }
.tabs { display: flex; border-bottom: 1px solid var(--line); }
.tabs button { flex: 1; border: 0; border-radius: 0; background: transparent; padding: 11px 6px; color: var(--muted);
  border-bottom: 2px solid transparent; font-weight: 600; }
.tabs button.on { color: var(--fg); border-bottom-color: var(--accent); }
.tabbody { overflow: auto; padding: 12px 14px 40px; flex: 1; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 12px; background: var(--panel); }
.card h4 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: .5px; color: var(--muted);
  display: flex; align-items: center; gap: 6px; }
.card h4 .spacer { flex: 1; }
.note { display: flex; gap: 8px; font-size: 13px; padding: 6px 0; border-top: 1px dashed var(--line); }
.note:first-of-type { border-top: 0; }
.note .i { color: var(--warn); }
.row { display: flex; align-items: center; gap: 8px; margin: 7px 0; }
.row > label { flex: 1; color: var(--muted); font-size: 13px; }
.row input[type=number], .row select, .row input[type=text] { width: 120px; padding: 5px 7px; border-radius: 6px;
  border: 1px solid var(--line2); background: var(--panel2); }
.row input[type=range] { width: 130px; accent-color: var(--accent); }
.row .val { width: 48px; text-align: right; font-variant-numeric: tabular-nums; font-size: 13px; }
.row .auto { font-size: 11px; padding: 2px 6px; color: var(--muted); }
.seg { display: inline-flex; border: 1px solid var(--line2); border-radius: 8px; overflow: hidden; background: var(--panel); }
.seg button { border: 0; border-radius: 0; border-right: 1px solid var(--line); padding: 5px 10px; background: transparent; }
.seg button:last-child { border-right: 0; }
.seg button.on { background: var(--accent-weak); color: var(--accent); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 10px; }
.chip { border: 1px solid var(--line2); border-radius: 9px; padding: 6px 10px; cursor: pointer; font-size: 13px; background: var(--panel);
  display: flex; align-items: center; gap: 6px; }
.chip.on { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-weak); }
.chip canvas { border-radius: 4px; }
.swatches { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 6px 0 4px; }
.sw { width: 24px; height: 24px; border-radius: 6px; border: 2px solid transparent; cursor: pointer;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.15); }
.sw.on { border-color: var(--accent); }
.swatches input[type=color] { width: 30px; height: 26px; border: 0; padding: 0; background: none; cursor: pointer; }
.switch { display: flex; align-items: center; gap: 8px; margin: 6px 0; font-size: 13px; }
.switch input { accent-color: var(--accent); width: 16px; height: 16px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 10px; font-size: 13px; }
.kv span:nth-child(odd) { color: var(--muted); }
.counts { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.count { background: var(--panel2); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; font-size: 12px; }
.count b { font-size: 16px; display: block; }
.insp-empty { color: var(--muted); font-size: 13px; }
.badge { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; vertical-align: -1px; }

/* ---------- stage */
.stage { display: grid; grid-template-columns: 1fr 1.25fr; gap: 10px; padding: 10px; min-height: 0; }
.stage.max-planPane { grid-template-columns: 1fr; } .stage.max-planPane #viewPane { display: none; }
.stage.max-viewPane { grid-template-columns: 1fr; } .stage.max-viewPane #planPane { display: none; }
.pane { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; display: flex; flex-direction: column;
  min-height: 0; min-width: 0; overflow: hidden; box-shadow: var(--shadow); position: relative; }
.pane-bar { display: flex; align-items: center; gap: 8px; padding: 7px 8px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.pane-bar .seg button { font-size: 13px; padding: 4px 9px; }
.chk { font-size: 13px; display: flex; gap: 4px; align-items: center; color: var(--muted); }
.chk input { accent-color: var(--accent); }
#plan { flex: 1; width: 100%; background: var(--plan-bg); cursor: default; touch-action: none; }
#plan.tool { cursor: crosshair; }
#viewer { flex: 1; position: relative; min-height: 0; }
#viewer canvas { display: block; }
.viewer-msg { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); background: var(--panel);
  padding: 10px 14px; border-radius: 8px; border: 1px solid var(--line); }
.legend { position: absolute; left: 10px; bottom: 10px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
  padding: 6px 9px; font-size: 12px; display: flex; gap: 10px; flex-wrap: wrap; max-width: calc(100% - 20px); opacity: .95; }
@media (max-width: 1100px) { .work { grid-template-columns: 300px 1fr; } .stage { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; } }

/* plan svg */
.u { stroke: var(--plan-under); stroke-width: 1; vector-effect: non-scaling-stroke; fill: none; }
.el { cursor: pointer; }
.el.wall { fill: var(--wall); }
.el.wall.int { fill: color-mix(in srgb, var(--wall) 70%, transparent); }
.el.col { fill: var(--wall); }
.el.op { stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.el.slab { fill: color-mix(in srgb, var(--accent) 10%, transparent); stroke: var(--accent); stroke-dasharray: 4 3;
  stroke-width: 1; vector-effect: non-scaling-stroke; }
.el.roof { fill: none; stroke: #c2410c; stroke-dasharray: 8 4; stroke-width: 1.4; vector-effect: non-scaling-stroke; }
.el.rail { fill: none; stroke: #6b7280; stroke-width: 3; vector-effect: non-scaling-stroke; }
.el.perg { fill: url(#hatchWood); stroke: #8a5a33; stroke-width: 1; vector-effect: non-scaling-stroke; }
.el.stair { fill: color-mix(in srgb, #7c3aed 12%, transparent); stroke: #7c3aed; stroke-width: 1.2; vector-effect: non-scaling-stroke; }
.el.sec { stroke: #dc2626; stroke-width: 1.6; stroke-dasharray: 14 4 3 4; vector-effect: non-scaling-stroke; fill: none; }
.sec-label { fill: #dc2626; font-weight: 700; }
.el:hover { filter: drop-shadow(0 0 2px var(--sel)); }
.el.sel { stroke: var(--sel) !important; stroke-width: 3 !important; vector-effect: non-scaling-stroke; }
.el.wall.sel, .el.col.sel { fill: var(--sel); }
.rubber { fill: color-mix(in srgb, var(--accent) 15%, transparent); stroke: var(--accent); stroke-width: 1.5;
  vector-effect: non-scaling-stroke; stroke-dasharray: 5 3; }

/* busy, toast, dialogs */
.busy { position: fixed; inset: 0; background: rgba(10,14,20,.45); display: flex; flex-direction: column; gap: 14px;
  align-items: center; justify-content: center; z-index: 50; color: #fff; font-weight: 600; }
/* progress: an elevation drafted line by line + estimated bar */
.loader { display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--fg); font-weight: 400; }
.card-loader { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px 16px;
  box-shadow: 0 10px 40px rgba(0,0,0,.35); width: min(380px, calc(100vw - 32px)); }
.pane-loader { position: absolute; inset: 44px 0 0; justify-content: center; background: var(--panel2); }
.ld-svg { width: 100%; max-width: 300px; border-radius: 8px; background: #f7f5ee; border: 1px solid var(--line); }
.ld-grid { stroke: #dfe6ee; stroke-width: .5; }
.ld-draw path { fill: none; stroke: #1b2a41; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 1; stroke-dashoffset: 1; animation: ld-draw 5.2s calc(var(--d) * .45s) ease-in-out infinite; }
.ld-draw .ld-thin { stroke-width: .7; stroke: #4a5a70; }
.ld-draw .ld-hatch { stroke-width: .6; stroke: #6b7686; }
.ld-dim { font: 600 8px -apple-system, "Segoe UI", sans-serif; fill: #4a5a70; text-anchor: middle; opacity: 0; animation: ld-fade 5.2s infinite; }
.ld-cut { animation: ld-sweep 5.2s ease-in-out infinite; }
.ld-axis { stroke: #C8102E; stroke-width: 1.1; stroke-dasharray: 10 3 2 3; }
.ld-arrow { fill: #C8102E; }
@keyframes ld-draw { 0% { stroke-dashoffset: 1; } 45%, 85% { stroke-dashoffset: 0; opacity: 1; } 100% { stroke-dashoffset: 0; opacity: 0; } }
@keyframes ld-fade { 0%, 55% { opacity: 0; } 65%, 85% { opacity: 1; } 100% { opacity: 0; } }
@keyframes ld-sweep { 0% { transform: translateX(0); opacity: 0; } 8% { opacity: 1; } 80% { transform: translateX(210px); opacity: 1; } 90%, 100% { transform: translateX(210px); opacity: 0; } }
.ld-title { font-weight: 650; margin-top: 4px; text-align: center; }
.ld-step { color: var(--muted); font-size: 13px; min-height: 1.4em; }
.ld-bar { width: 100%; max-width: 300px; height: 6px; border-radius: 99px; background: var(--line); overflow: hidden; }
.ld-fill { height: 100%; width: 0; border-radius: 99px; background: linear-gradient(90deg, var(--accent), #C8102E);
  transition: width .25s linear; }
.ld-time { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
@media (prefers-reduced-motion: reduce) { .ld-draw path { animation: none; stroke-dashoffset: 0; } .ld-cut, .ld-dim { animation: none; opacity: 1; } }
.spinner { width: 42px; height: 42px; border-radius: 50%; border: 4px solid rgba(255,255,255,.3); border-top-color: #fff;
  animation: spin 0.9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: #1c232b; color: #fff;
  padding: 9px 16px; border-radius: 9px; z-index: 60; box-shadow: var(--shadow); max-width: 80vw; }
.toast.err { background: var(--danger); }
.dlg { border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; width: min(560px, 92vw); background: var(--panel);
  color: var(--fg); box-shadow: var(--shadow); }
.dlg::backdrop { background: rgba(10,14,20,.45); }
.dlg h2 { margin: 0 0 12px; font-size: 18px; }
.dlg-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }
.file { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 9px;
  margin-bottom: 6px; }
.file .n { flex: 1; font-size: 13px; word-break: break-all; }
.file a { color: var(--accent); text-decoration: none; font-weight: 600; }
.ext { font-size: 11px; font-weight: 700; padding: 3px 6px; border-radius: 5px; background: var(--accent-weak); color: var(--accent); }

/* ---------- empty header before a project is open */
body.noproj #projName, body.noproj #saveState, body.noproj #btnExport { display: none; }

/* ---------- drawings sheet view */
.sheetview { position: absolute; inset: 0; display: flex; flex-direction: column; background: var(--panel2); z-index: 2; }
.sheet-tools { display: flex; align-items: center; gap: 6px; padding: 6px 10px; border-bottom: 1px solid var(--line); }
.sheet-scroll { flex: 1; overflow: auto; cursor: grab; }
.sheet-scroll.drag { cursor: grabbing; }
.sheet-scroll img { display: block; background: #fff; margin: 12px auto; box-shadow: var(--shadow); max-width: none; user-select: none; -webkit-user-drag: none; }