:root {
  --bg: #f4f2ed;
  --panel: #fffdf8;
  --ink: #23271f;
  --muted: #6b6f64;
  --line: #e2ddd1;
  --accent: #e8590c;
  --accent-ink: #fff;
  --moss: #596b5b;
  --field: #f1eee6;
  --viewer: #e9e6de;
  --danger: #b42318;
  --start: #2f9e44;
  --finish: #c92a2a;
  --plate: #f4f0e6;
  --lettering: #2b2f28;
  --contour: #6b4f2a;
  --radius: 12px;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161815;
    --panel: #1e211d;
    --ink: #ecebe5;
    --muted: #9da196;
    --line: #30342e;
    --accent: #ff7a2e;
    --accent-ink: #1a1a1a;
    --moss: #8fa58f;
    --field: #262a25;
    --viewer: #121411;
    --danger: #ff8a7a;
    --start: #51cf66;
    --finish: #ff6b6b;
    --plate: #dcd5c5;
    --lettering: #1d201b;
    --contour: #8a6a3e;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font-size: 15px; line-height: 1.45; min-height: 100vh; display: flex; flex-direction: column; }
button { font: inherit; color: inherit; }
svg { display: block; }
.mtn { fill: var(--moss); }
.trk { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-linecap: round; }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 24px; border-bottom: 1px solid var(--line); background: var(--panel); }
.brand { display: flex; align-items: center; gap: 10px; }
.brand svg { width: 28px; height: 28px; }
.brand .name { font-weight: 700; font-size: 19px; letter-spacing: -0.01em; }
.brand .tag { color: var(--muted); font-size: 14px; }
.top-btn { display: inline-flex; align-items: center; gap: 6px; flex: none; border: 1px solid var(--line); background: var(--field); color: var(--ink); border-radius: 8px; padding: 6px 12px; font: inherit; font-size: 14px; cursor: pointer; }
.top-btn:hover, .top-btn.done { border-color: var(--accent); }
.top-btn.done { color: var(--accent); }
.top-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.layout { flex: 1; display: grid; grid-template-columns: 360px 1fr; gap: 20px; padding: 20px 24px; min-height: 0; }
.panel { display: flex; flex-direction: column; gap: 14px; }
@media (min-width: 861px) {
  body { height: 100vh; }
  .panel { overflow-y: auto; min-height: 0; scroll-padding-bottom: 150px; margin: -4px -8px -4px -4px; padding: 4px 8px 0 4px; scrollbar-width: thin; }
}
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.card h2 { margin: 0 0 12px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 600; }

.drop { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 20px 12px; border: 1.5px dashed var(--line); border-radius: 10px; text-align: center; cursor: pointer; transition: border-color .15s, background .15s; }
.drop:hover, .drop.over { border-color: var(--accent); background: var(--field); }
.drop svg { width: 26px; height: 26px; fill: none; stroke: var(--muted); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; margin-bottom: 4px; }
.drop small { color: var(--muted); }
.route-info { display: grid; gap: 2px; }
.route-name { font-weight: 650; font-size: 16px; overflow-wrap: anywhere; }
.route-meta { color: var(--muted); font-size: 14px; }
.hint { margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.link { background: none; border: 0; padding: 0; color: var(--accent); cursor: pointer; text-decoration: underline; text-underline-offset: 2px; justify-self: start; }

.field { display: grid; gap: 6px; margin-top: 12px; }
.field:first-child { margin-top: 0; }
.field + [id$="-controls"] { margin-top: 12px; }
.field .row { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.label { font-weight: 550; }
.field .help { color: var(--muted); font-size: 13px; }
.slide { display: flex; align-items: center; gap: 12px; }
.slide input[type=range] { flex: 1; min-width: 0; }
.val { flex: none; display: flex; align-items: baseline; gap: 4px; color: var(--muted); font-size: 13px; }
.val input { width: 64px; text-align: right; font: inherit; font-size: 14px; color: var(--ink); background: var(--field); border: 1px solid var(--line); border-radius: 6px; padding: 2px 6px; }
input[type=range] { width: 100%; accent-color: var(--accent); margin: 0; }

.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; background: var(--field); border-radius: 8px; padding: 3px; gap: 3px; }
.seg button { white-space: nowrap; border: 0; background: transparent; padding: 6px 4px; border-radius: 6px; cursor: pointer; color: var(--muted); font-size: 14px; }
.seg button[aria-checked=true] { background: var(--panel); color: var(--ink); box-shadow: 0 1px 2px rgb(0 0 0 / .15); font-weight: 600; }

.advanced summary { cursor: pointer; font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 600; }
.advanced[open] summary { margin-bottom: 12px; }
.advanced .link { margin-top: 14px; font-size: 14px; }

.actions { display: grid; gap: 10px; position: sticky; bottom: 0; background: var(--bg); padding: 10px 0 12px; margin-top: auto; box-shadow: 0 -10px 10px -6px var(--bg); }
.estimate { color: var(--muted); font-size: 13px; }
.estimate.warn { color: var(--danger); }
.primary { display: inline-flex; align-items: center; justify-content: center; gap: 8px; background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 10px; padding: 12px 18px; font-weight: 650; font-size: 16px; cursor: pointer; transition: filter .15s, opacity .15s; }
.primary:hover:not(:disabled) { filter: brightness(1.07); }
.primary:disabled { opacity: .45; cursor: default; }
.primary svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.progress .bar { height: 6px; background: var(--field); border-radius: 3px; overflow: hidden; }
.progress .bar span { display: block; height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.progress-label { color: var(--muted); font-size: 13px; margin-top: 6px; }
.error { color: var(--danger); font-size: 14px; background: color-mix(in srgb, var(--danger) 10%, transparent); padding: 10px 12px; border-radius: 8px; }

.stage { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.viewer { position: relative; flex: 1; min-height: 420px; background: var(--viewer); border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); }
.viewer canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.empty { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; color: var(--muted); text-align: center; padding: 16px; pointer-events: none; }
.empty svg { width: 72px; height: 72px; opacity: .6; }
.empty .trk { stroke-width: 3; }
.viewer-tools { position: absolute; top: 10px; right: 10px; }
.viewer-tools button { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 8px; border: 1px solid var(--line); background: var(--panel); cursor: pointer; }
.viewer-tools svg { width: 18px; height: 18px; fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.legend { position: absolute; left: 12px; bottom: 10px; font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.sw { width: 12px; height: 4px; border-radius: 2px; display: inline-block; }
.sw.trail { background: var(--accent); }
.sw.start { background: var(--start); margin-left: 6px; }
.sw.end { background: var(--finish); margin-left: 6px; }
.seg.icons button { display: grid; place-items: center; min-height: 34px; }
.seg.icons svg { width: 18px; height: 18px; fill: currentColor; }
.viewer:not(.has-model) .viewer-tools, .viewer:not(.has-model) .legend { display: none; }
.viewer.has-route .empty { display: none; }

.result { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stats { display: flex; flex-wrap: wrap; gap: 6px 28px; margin: 0; }
.stats div { display: grid; }
.stats dt { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.stats dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }
.download span { font-weight: 400; opacity: .8; font-size: 14px; }

.foot { padding: 12px 24px 20px; color: var(--muted); font-size: 13px; }
.foot a { color: inherit; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; padding: 16px; }
  .viewer { min-height: 300px; aspect-ratio: 4 / 3; flex: none; }
  .actions { position: static; }
  .brand .tag { display: none; }
  .topbar, .foot { padding-left: 16px; padding-right: 16px; }
}
#trail-controls, #marker-controls, #model-controls + .field { margin-top: 12px; }

/* ---- viewer tabs + map ---- */
.tabs { position: absolute; top: 10px; left: 50%; transform: translateX(-50%); z-index: 1000; display: flex; gap: 3px; padding: 3px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 1px 4px rgb(0 0 0 / .12); }
.tabs button { border: 0; background: transparent; padding: 6px 14px; border-radius: 7px; cursor: pointer; color: var(--muted); font-size: 14px; }
.tabs button[aria-selected=true] { background: var(--accent); color: var(--accent-ink); font-weight: 600; }
.tabs button:disabled { opacity: .4; cursor: default; }
.pane-map { position: absolute; inset: 0; z-index: 0; background: var(--viewer); }
.viewer[data-tab=map] .pane-3d, .viewer[data-tab=map] .viewer-tools, .viewer[data-tab=map] .legend { display: none; }
.viewer[data-tab="3d"] .pane-map, .viewer[data-tab="3d"] .map-info,
.viewer:not(.has-route) .pane-map, .viewer:not(.has-route) .map-info { visibility: hidden; }
.map-info { position: absolute; left: 10px; bottom: 24px; z-index: 1000; background: var(--panel); color: var(--ink); border: 1px solid var(--line); border-radius: 8px; padding: 6px 10px; font-size: 13px; pointer-events: none; box-shadow: 0 1px 4px rgb(0 0 0 / .12); }
.map-info .warn { color: var(--danger); }
.area-note { margin: 12px 0 0; color: var(--muted); font-size: 13px; }
.area-note .link { font-size: 13px; }

.leaflet-container { font: inherit; font-size: 12px; }
path.fp-box { stroke: #1f2937; stroke-dasharray: 7 5; fill: #1f2937; fill-opacity: .07; cursor: move; }
path.fp-casing { stroke: #fff; stroke-opacity: .9; stroke-linecap: round; stroke-linejoin: round; }
path.fp-route { stroke: #e8590c; stroke-linecap: round; stroke-linejoin: round; }
path.fp-route-full { stroke: #e8590c; stroke-opacity: .35; stroke-dasharray: 2 6; stroke-linecap: round; }
.fp-dot { border-radius: 50%; border: 3px solid #fff; box-shadow: 0 1px 4px rgb(0 0 0 / .45); cursor: grab; }
.fp-dot-start { background: #2f9e44; }
.fp-dot-end { background: #c92a2a; }
.fp-handle { background: #fff; border: 2px solid #1f2937; border-radius: 4px; box-shadow: 0 1px 3px rgb(0 0 0 / .35); }
.fp-nw, .fp-se { cursor: nwse-resize; }
.fp-ne, .fp-sw { cursor: nesw-resize; }
.fp-c { cursor: move; border-radius: 50%; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2937' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3v18M3 12h18M12 3l-3 3m3-3 3 3M12 21l-3-3m3 3 3-3M3 12l3-3m-3 3 3 3M21 12l-3-3m3 3-3 3'/%3E%3C/svg%3E") center / 18px no-repeat; }
@media (max-width: 860px) {
  .map-info { bottom: auto; top: 52px; left: 50%; transform: translateX(-50%); white-space: nowrap; }
  .leaflet-control-zoom { display: none; }
}
#shape { display: flex; }
#shape button { flex: 1 1 auto; font-size: 13.5px; }
.trim { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); }
.trim .area-note { margin-top: 8px; }
.check { display: flex; align-items: center; gap: 8px; font-weight: 550; cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--accent); margin: 0; }
#label-body { margin-top: 12px; }
#label-text { width: 100%; resize: vertical; min-height: 84px; font: inherit; font-size: 14px; line-height: 1.4; color: var(--ink); background: var(--field); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
#label-text:focus { outline: 2px solid color-mix(in srgb, var(--accent) 50%, transparent); outline-offset: 1px; }
#label-controls { margin-top: 12px; }
.fp-label-svg { cursor: move; }
.fp-label-svg rect { fill: #fff; fill-opacity: .85; stroke: #1f2937; stroke-width: .4; }
.fp-label-svg path { fill: #1f2937; }
.fp-label-handle { border-radius: 50%; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2937' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3v18M3 12h18M12 3l-3 3m3-3 3 3M12 21l-3-3m3 3 3-3M3 12l3-3m-3 3 3 3M21 12l-3-3m3 3-3 3'/%3E%3C/svg%3E") center / 14px no-repeat; border: 2px solid #1f2937; box-shadow: 0 1px 3px rgb(0 0 0 / .35); cursor: move; }
.no-gl { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; color: var(--muted); padding: 16px; }
.fp-label-svg { pointer-events: none !important; }
.fp-label-svg rect, .fp-label-svg path { pointer-events: auto; }
.fp-rotate-handle { border-radius: 50%; border: 2px solid #1f2937; box-shadow: 0 1px 3px rgb(0 0 0 / .35); cursor: grab; background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2937' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 12a8 8 0 1 1-2.3-5.6M20 4v4h-4'/%3E%3C/svg%3E") center / 13px no-repeat; }
.viewer-tools { display: flex; gap: 6px; }
.viewer-tools button[aria-pressed=true] { background: var(--accent); border-color: var(--accent); }
.viewer-tools button[aria-pressed=true] svg { stroke: var(--accent-ink); }
.downloads { display: grid; justify-items: center; gap: 6px; }
.downloads .link { font-size: 14px; }
#inlay-body { margin-top: 12px; }
#inlay-controls { margin-top: 12px; }
.warn-note { color: var(--danger); }
select { width: 100%; font: inherit; font-size: 14px; color: var(--ink); background: var(--field); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
#flat-body { margin-top: 12px; }
#flat-controls { margin-top: 12px; }