:root {
  --bg: #0f1720;
  --card: #182430;
  --card-2: #1f2e3d;
  --line: #2c3e50;
  --text: #e6edf3;
  --muted: #9fb0c0;
  --accent: #3da9fc;
  --accent-2: #2b8adb;
  --good: #45c07a;
  --warn: #e0a53a;
  --link: #7cc7ff;        /* light sky blue: ~9:1 contrast on --bg */
  --link-hover: #b8e2ff;
  --radius: 10px;
}

/* Links: light blue, underlined, and the same colour once visited, so they
   stay readable on the dark background (browser default is dark blue/purple). */
a, a:visited { color: var(--link); text-decoration: underline; text-underline-offset: 2px; }
a:hover, a:focus-visible { color: var(--link-hover); }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; border-radius: 2px; }

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

.app-header {
  padding: 28px 24px 8px;
  max-width: 960px;
  margin: 0 auto;
}
.app-header h1 { margin: 0 0 4px; font-size: 26px; letter-spacing: 0.5px; }
.tagline { color: var(--muted); margin: 0; max-width: 640px; }

/* Disclaimer */
.app-header { position: relative; }
.disc-link {
  position: absolute; top: 12px; right: 24px;
  color: var(--muted); font-size: 12px; text-decoration: none;
}
.disc-link a, .disc-link a:visited { color: var(--link); text-decoration: none; }
.disc-link a:hover { color: var(--link-hover); text-decoration: underline; }
.disc-note { display: block; margin-top: 4px; font-size: 11.5px; opacity: .8; }
.app-footer a, .app-footer a:visited { color: var(--link); text-decoration: underline; }
.app-footer a:hover { color: var(--link-hover); }
.disc-modal { width: min(680px, 96vw); }
.disc-body { font-size: 13px; line-height: 1.55; color: var(--muted); }
.disc-body h4 { margin: 12px 0 2px; font-size: 13px; color: var(--text); }
.disc-body p { margin: 0 0 8px; }
.disc-foot { display: flex; justify-content: flex-end; padding: 10px 18px 14px; }

main { max-width: 960px; margin: 0 auto; padding: 12px 24px 40px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin: 18px 0;
}
.card h2 { margin: 0 0 12px; font-size: 18px; display: flex; align-items: center; gap: 10px; }
.step {
  display: inline-grid; place-items: center;
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: #06121d; font-weight: 700; font-size: 14px;
}
.optional { color: var(--muted); font-weight: 400; font-size: 13px; }
.hint { color: var(--muted); margin: 0 0 14px; font-size: 13.5px; }

/* Sources */
.sources-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 760px) { .sources-grid { grid-template-columns: 1fr; } }
.source { display: flex; flex-direction: column; min-width: 0; }
.drop {
  flex: 1; min-width: 0; box-sizing: border-box;
  display: flex; flex-direction: column; gap: 4px;
  border: 1.5px dashed var(--line); border-radius: var(--radius);
  padding: 16px; cursor: pointer; transition: border-color .15s, background .15s;
  background: var(--card-2);
}
.drop:hover { border-color: var(--accent); }
.drop input[type=file] { display: none; }
.drop-title { font-weight: 600; }
.drop-sub { color: var(--muted); font-size: 12.5px; }
.drop-status { margin-top: auto; padding-top: 6px; font-size: 12.5px; color: var(--muted); overflow-wrap: anywhere; }
.source.loaded .drop { border-style: solid; border-color: var(--good); }
.source.loaded .drop-status { color: var(--good); }

/* Config tables */
.map-row {
  display: grid; grid-template-columns: 1fr 200px; gap: 12px; align-items: center;
  padding: 8px 0; border-bottom: 1px solid var(--line);
}
.map-row:last-child { border-bottom: none; }
.map-row .label { font-size: 14px; }
.map-row .note { color: var(--muted); font-size: 12px; }
.group-title {
  margin: 16px 0 4px; font-size: 12px; text-transform: uppercase;
  letter-spacing: 1px; color: var(--accent);
}
select, input[type=text], input[type=number] {
  background: var(--card-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 6px; padding: 7px 9px; font: inherit;
  width: 100%;
}
select:focus, input:focus { outline: 1px solid var(--accent); }
select:disabled { opacity: .55; cursor: not-allowed; color: var(--muted); }
input[readonly] {
  opacity: .7; cursor: default; color: var(--muted);
  background: var(--card); border-style: dashed;
}
input[readonly]:focus { outline: none; }
.map-row.fixed .label { color: var(--muted); }
.map-row.fixed .note::after { content: ' (fixed — GPX only)'; color: var(--accent); }
.map-row.with-separator { border-bottom: 2px solid var(--accent); padding-bottom: 12px; margin-bottom: 4px; }

/* Options + build */
.options { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 16px; }
.options label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); }
.options input, .options select { width: 140px; }
.options label[hidden] { display: none; }

button.primary {
  background: var(--accent); color: #06121d; border: none; border-radius: 8px;
  padding: 12px 22px; font-size: 15px; font-weight: 600; cursor: pointer;
}
button.primary:hover:not(:disabled) { background: var(--accent-2); }
button.primary:disabled { opacity: .45; cursor: not-allowed; }

.progress { margin-top: 16px; }
.progress-bar { height: 8px; background: var(--card-2); border-radius: 5px; overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.progress-text { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; }

.result {
  margin-top: 16px; padding: 16px; border-radius: 8px;
  background: var(--card-2); border: 1px solid var(--line);
}
.result h3 { margin: 0 0 8px; }
.result .stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; margin: 10px 0; }
.result .stat { background: var(--card); border-radius: 6px; padding: 8px 10px; }
.result .stat b { display: block; font-size: 18px; }
.result .stat span { color: var(--muted); font-size: 12px; }
button.stat.clickable {
  border: 1px solid var(--line); text-align: left; cursor: pointer;
  color: var(--text); font: inherit; transition: border-color .15s, background .15s;
}
button.stat.clickable:hover { border-color: var(--accent); background: var(--card-2); }
button.stat.clickable span { color: var(--accent); }
.result .stats-total { margin-top: -2px; font-size: 12px; }
.result .merge-summary ul { margin: 4px 0 0; padding-left: 20px; }
.result .merge-summary li { margin: 2px 0; }

/* Detail modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .6);
  display: grid; place-items: center; z-index: 100; padding: 20px;
}
.modal {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  width: min(920px, 96vw); max-height: 88vh; display: flex; flex-direction: column;
}
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 16px 18px 8px; }
.modal-head h3 { margin: 0; }
.modal-close { background: none; border: none; color: var(--muted); font-size: 26px; cursor: pointer; line-height: 1; }
.modal-close:hover { color: var(--text); }
.modal-search { margin: 6px 18px 10px; width: calc(100% - 36px); }
.source-filter { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 18px 10px; }
.src-chip {
  background: var(--card-2); color: var(--muted); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 12px; font: inherit; font-size: 12.5px; cursor: pointer;
}
.src-chip:hover { border-color: var(--accent); color: var(--text); }
.src-chip.active { background: var(--accent); color: #06121a; border-color: var(--accent); font-weight: 600; }
.modal-body { overflow: auto; padding: 0 18px; }
.modal-foot { padding: 10px 18px 16px; color: var(--muted); font-size: 12.5px; }

.detail-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.detail-table th, .detail-table td {
  padding: 6px 10px; border-bottom: 1px solid var(--line); text-align: left;
  white-space: nowrap; max-width: 320px; overflow: hidden; text-overflow: ellipsis;
}
.detail-table th { position: sticky; top: 0; background: var(--card); color: var(--accent); }
.detail-table th.r, .detail-table td.r { text-align: right; font-variant-numeric: tabular-nums; }
.detail-table tbody tr:hover { background: var(--card-2); }

/* Modal footer: count text (list modal is read-only) */
.modal-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; }

/* Info button */
.detail-table button.row-info {
  background: none; border: 1px solid var(--line); border-radius: 4px;
  cursor: pointer; padding: 1px 7px; font-size: 13px; color: var(--accent);
}
.detail-table button.row-info:hover { border-color: var(--accent); background: var(--card-2); }

/* Single-record detail panel (nested above the list modal) */
.record-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .55);
  display: grid; place-items: center; z-index: 120; padding: 24px;
}
.record-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  width: min(720px, 94vw); max-height: 86vh; display: flex; flex-direction: column;
}
.record-sub { color: var(--muted); font-size: 13px; font-weight: 400; }
.record-body { overflow: auto; padding: 4px 18px 18px; }
.record-body h4 { margin: 18px 0 6px; color: var(--accent); font-size: 13px; }
.record-detail { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.record-detail th {
  text-align: left; color: var(--muted); font-weight: 500; width: 160px;
  padding: 6px 12px 6px 0; vertical-align: top;
}
.record-detail td { padding: 6px 0; }
.record-detail tr + tr th, .record-detail tr + tr td { border-top: 1px solid var(--line); }

/* Editable inputs inside the record panel */
.record-detail input.cell-edit {
  width: 100%; max-width: 320px; background: var(--card-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 4px; padding: 4px 7px; font: inherit;
}
.record-detail input.cell-edit:focus { outline: 1px solid var(--accent); }
.record-detail input.cell-edit.edited { border-color: var(--accent); background: rgba(120, 200, 255, .08); }

/* Record panel footer: delete on the left, save on the right */
.record-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 18px; border-top: 1px solid var(--line);
}
.record-actions { display: flex; align-items: center; gap: 10px; }
.record-dirty { color: var(--accent); font-size: 12.5px; }
.btn-save {
  background: var(--accent); color: #06121a; border: none; border-radius: 6px;
  padding: 7px 14px; font: inherit; font-weight: 600; cursor: pointer;
}
.btn-save:disabled { opacity: .4; cursor: default; }
.btn-save:not(:disabled):hover { filter: brightness(1.08); }
.btn-del {
  background: none; color: var(--muted); border: 1px solid var(--line);
  border-radius: 6px; padding: 7px 14px; font: inherit; cursor: pointer;
}
.btn-del:hover { border-color: #e06c6c; color: #e06c6c; }
.btn-del.active { border-color: #e06c6c; color: #e06c6c; background: rgba(224, 108, 108, .1); }

/* Nested freq/runway row delete buttons + deleted-row styling */
.record-body button.sub-del {
  background: none; border: 1px solid var(--line); border-radius: 4px;
  cursor: pointer; padding: 1px 6px; font-size: 12px;
}
.record-body button.sub-del:hover { border-color: #e06c6c; }
.record-body tr.row-deleted td { opacity: .4; text-decoration: line-through; }
.record-body tr.row-deleted button.sub-del { text-decoration: none; opacity: 1; }
.record-body button.new-del {
  background: none; border: 1px solid var(--line); border-radius: 4px;
  cursor: pointer; padding: 1px 6px; font-size: 12px;
}
.record-body button.new-del:hover { border-color: #e06c6c; }
.btn-add-freq {
  margin-top: 8px; background: none; color: var(--accent);
  border: 1px dashed var(--line); border-radius: 6px; padding: 5px 12px;
  font: inherit; cursor: pointer;
}
.btn-add-freq:hover { border-color: var(--accent); background: var(--card-2); }
.result a.download, .result a.download:visited, .result a.download:hover {
  display: inline-block; margin-top: 8px; background: var(--good); color: #06121d;
  padding: 10px 18px; border-radius: 8px; text-decoration: none; font-weight: 600;
}
.result a.download:hover { filter: brightness(1.1); }
.result.error { border-color: #d05a5a; }
.result.error h3 { color: #ff8a8a; }

.app-footer { text-align: center; color: var(--muted); font-size: 12px; padding: 20px; }

.records-summary { margin-top: 10px; font-size: 12.5px; color: var(--muted); }
.records-summary details summary { cursor: pointer; color: var(--accent); }
.records-summary table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.records-summary td { padding: 2px 8px; border-bottom: 1px solid var(--line); }
.records-summary td.count { text-align: right; font-variant-numeric: tabular-nums; }
.records-summary .used { color: var(--good); }
.records-summary .unused { color: var(--muted); }

.records-summary tr.group-row th { text-align: left; padding-top: 8px; color: var(--accent, #6cf); }
.records-summary th.count { text-align: right; }


.preset-row { border-bottom: 2px solid var(--accent, #6cf); padding-bottom: 8px; margin-bottom: 4px; }
.preset-row .label { font-weight: 600; }


.warn { background: rgba(255, 170, 0, .1); border-left: 3px solid #fa0; color: #fc6; padding: 8px 12px; margin: 8px 0 12px; border-radius: 4px; font-size: .9em; }
.warn strong { color: #fd8; }


.custom-map[hidden] { display: none; }


.build-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.build-as { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }

/* Step 1: links to the user guide's data-source section */
.h2-link { font-size: 13px; font-weight: 400; margin-left: 12px; white-space: nowrap; }
.src-link { display: inline-block; margin-top: 6px; font-size: 12.5px; }