:root {
  --bg: #0b0d12;
  --panel: #141821;
  --panel-2: #1b2030;
  --text: #e6e8ee;
  --muted: #8a93a6;
  --accent: #f2b84b;
  --accent-2: #5ec8e5;
  --good: #6fcf7f;
  --warn: #f2994a;
  --bad: #eb5757;
  --border: #262c3a;
  --nav-h: 48px;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --c-selfo: #f2b84b;
  --c-nelfo: #f2994a;
  --c-mesh: #5ec8e5;
  --c-nrho: #b48cf2;
  --c-halo: #e58cc8;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 "Inter", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-2); }
.mono, .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }

/* ---------- nav (shared look) ---------- */
.topnav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  display: flex; align-items: center; gap: 28px;
  padding: 0 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.topnav .brand {
  font-weight: 700; letter-spacing: 0.16em; font-size: 13px;
  color: var(--text); text-decoration: none; white-space: nowrap;
}
.topnav .brand span { color: var(--accent); }
.topnav nav { display: flex; gap: 20px; height: 100%; overflow-x: auto; }
.topnav nav a {
  display: flex; align-items: center; height: 100%;
  color: var(--muted); text-decoration: none; font-size: 13px; font-weight: 500;
  border-bottom: 2px solid transparent; white-space: nowrap;
}
.topnav nav a:hover { color: var(--text); }
.topnav nav a.active { color: var(--text); border-bottom-color: var(--accent); }

/* ---------- layout ---------- */
main { padding: 16px; max-width: 1600px; margin: 0 auto; }
.page-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 16px; margin: 4px 0 14px; }
.page-head h1 { font-size: 20px; margin: 0; font-weight: 650; letter-spacing: -0.01em; }
.page-head p { margin: 0; color: var(--muted); max-width: 900px; }

.workspace {
  display: grid;
  grid-template-columns: 330px minmax(0, 1fr);
  gap: 14px;
  align-items: stretch;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.panel h2, .section-title {
  font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted); font-weight: 600; margin: 0 0 10px;
}

/* ---------- control side panel ---------- */
.controls { padding: 12px; display: flex; flex-direction: column; gap: 10px; max-height: calc(100vh - var(--nav-h) - 80px); overflow-y: auto; }
.layer {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--lc, var(--muted));
  border-radius: 8px;
  padding: 8px 10px 10px;
}
.layer.off { opacity: 0.55; }
.layer-head { display: flex; align-items: center; gap: 8px; }
.layer-head label { font-weight: 600; font-size: 13px; cursor: pointer; flex: 1; display: flex; align-items: center; gap: 8px; }
.layer .count { font-family: var(--mono); font-size: 10.5px; color: var(--muted); margin-top: 2px; }
.layer .sub { font-size: 11.5px; color: var(--muted); margin: 2px 0 6px; }
.params { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.params label, .field { display: flex; flex-direction: column; gap: 2px; font-size: 10.5px; color: var(--muted); }
input[type=number], select {
  width: 100%;
  background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 5px;
  padding: 4px 6px; font: 12px var(--mono);
}
input[type=number]:focus, select:focus { outline: 1px solid var(--accent); border-color: var(--accent); }
input[type=checkbox] { accent-color: var(--accent); width: 15px; height: 15px; margin: 0; }
input[type=range] { accent-color: var(--accent); width: 100%; }
.swatch { width: 10px; height: 10px; border-radius: 50%; background: var(--lc); flex: none; }

.global-opts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.chk-row { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 12px; color: var(--text); }
.chk-row label { display: flex; align-items: center; gap: 6px; cursor: pointer; }

button {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 6px 12px; font: 600 12px "Inter", sans-serif; cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #1a1406; border-color: var(--accent); }
button.primary:hover { filter: brightness(1.08); }

/* ---------- 3D viewport ---------- */
.viewport { position: relative; min-height: 560px; height: calc(100vh - var(--nav-h) - 80px); overflow: hidden; }
#scene { position: absolute; inset: 0; }
#scene canvas { display: block; }
.vp-overlay { position: absolute; pointer-events: none; }
.vp-top { top: 10px; left: 12px; right: 12px; display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.vp-top > * { pointer-events: auto; }
.chip {
  background: rgba(20, 24, 33, 0.86); border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 10px; font-size: 12px; backdrop-filter: blur(4px);
}
.legend-layers { display: flex; flex-wrap: wrap; gap: 4px 12px; }
.legend-layers span { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); }
.legend-layers i { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.legend-layers b { font-weight: 500; color: var(--text); }
.vp-bottom {
  left: 12px; right: 12px; bottom: 10px; pointer-events: auto;
  display: flex; align-items: center; gap: 10px;
  background: rgba(20, 24, 33, 0.9); border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 10px;
}
.vp-bottom .time { font-family: var(--mono); font-size: 12px; min-width: 150px; white-space: nowrap; }
.vp-bottom select { width: auto; }
#playBtn { min-width: 64px; }

.label3d {
  font: 600 10.5px "Inter", sans-serif; color: var(--text);
  background: rgba(11, 13, 18, 0.72); border: 1px solid var(--border);
  padding: 1px 6px; border-radius: 4px; white-space: nowrap; pointer-events: none;
  transform: translateY(-12px);
}
.label3d.earth { color: #9fd8ff; border-color: #2c5a78; font-size: 11.5px; }
.label3d.site { font-weight: 500; font-size: 10px; color: #f5e2b8; }

/* ---------- coverage section ---------- */
.coverage { margin-top: 14px; display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: 14px; }
.coverage .panel { padding: 14px; }
.map-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; justify-content: space-between; margin-bottom: 8px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; }
.seg button { border: 0; border-radius: 0; background: transparent; color: var(--muted); padding: 6px 10px; font-weight: 500; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button.on { background: var(--panel-2); color: var(--text); box-shadow: inset 0 -2px 0 var(--accent); }
.map-wrap { position: relative; width: 100%; aspect-ratio: 2 / 1; background: #07080b; border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
#map2d { width: 100%; height: 100%; display: block; cursor: crosshair; }
.map-tip {
  position: absolute; pointer-events: none; display: none;
  background: rgba(11,13,18,0.94); border: 1px solid var(--border); border-radius: 6px;
  padding: 6px 8px; font-size: 11.5px; line-height: 1.45; white-space: nowrap; z-index: 2;
}
.map-tip .num { color: var(--accent); }
.legend-bar { display: flex; align-items: center; gap: 10px; margin-top: 10px; font-size: 11.5px; color: var(--muted); }
.legend-bar canvas { flex: 1; height: 12px; border-radius: 3px; min-width: 120px; }
.legend-ticks { display: flex; justify-content: space-between; font: 10.5px var(--mono); color: var(--muted); margin: 2px 0 0 0; }
.legend-wrap { flex: 1; }
.status { font-size: 12px; color: var(--muted); }
.status .num { color: var(--text); }
.progress { height: 3px; background: var(--panel-2); border-radius: 2px; overflow: hidden; margin-top: 8px; }
.progress div { height: 100%; width: 0; background: var(--accent); transition: width 0.15s; }

.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 12px; }
.kpi { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
.kpi .k { font-size: 10.5px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.kpi .v { font: 600 20px var(--mono); margin-top: 2px; }
.kpi .v small { font-size: 12px; color: var(--muted); font-weight: 400; }

table { width: 100%; border-collapse: collapse; font-size: 12px; }
th, td { padding: 5px 6px; text-align: right; border-bottom: 1px solid var(--border); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; white-space: normal; }
th { color: var(--muted); font-weight: 500; font-size: 11px; }
td.num { font-family: var(--mono); }
td .kind { color: var(--muted); font-size: 10.5px; display: block; }
.tbl-scroll { overflow-x: auto; }
.v-good { color: var(--good); } .v-warn { color: var(--warn); } .v-bad { color: var(--bad); }
.note { font-size: 11.5px; color: var(--muted); margin: 8px 0 0; }

/* ---------- link budget ---------- */
.linkbudget { margin-top: 14px; padding: 14px; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 18px; }
.lb-inputs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.lb-out { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 10px 0; }
.formula { font: 11.5px/1.6 var(--mono); color: var(--muted); background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 8px 10px; overflow-x: auto; }
.anchors li { margin-bottom: 4px; }
.anchors { padding-left: 18px; margin: 6px 0; font-size: 12.5px; }
.lb-side p, .lb-side li { font-size: 12.5px; }

/* ---------- rationale cards ---------- */
.rationale { margin-top: 18px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.card h3 { margin: 0 0 6px; font-size: 14px; font-weight: 650; }
.card h3 .tag { font: 600 10px var(--mono); color: var(--accent); margin-right: 6px; letter-spacing: 0.05em; }
.card p, .card li { font-size: 12.8px; color: #c9cdd8; margin: 0 0 6px; }
.card ul { margin: 0; padding-left: 18px; }
.card b { color: var(--text); font-weight: 600; }
footer { color: var(--muted); font-size: 11.5px; padding: 18px 16px 30px; max-width: 1600px; margin: 0 auto; }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .coverage, .linkbudget { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 820px) {
  main { padding: 12px 16px; }
  .workspace { grid-template-columns: minmax(0, 1fr); }
  .controls { max-height: none; overflow: visible; order: 2; }
  .viewport { order: 1; height: 62vh; min-height: 380px; }
  .kpis { grid-template-columns: repeat(2, 1fr); }
  .lb-inputs, .lb-out { grid-template-columns: repeat(2, 1fr); }
  .vp-bottom { flex-wrap: wrap; }
  .vp-bottom input[type=range] { order: 5; flex-basis: 100%; }
  .topnav { gap: 14px; padding: 0 12px; }
  .topnav nav { gap: 14px; }
}

#vpInfo { display: flex; align-items: center; font-size: 11.5px; }

.panel, .card { min-width: 0; }
.status { overflow-wrap: anywhere; }
#focusSel { max-width: 220px; }
@media (max-width: 600px) {
  .vp-top .legend-layers { display: none; }
  #vpInfo { flex-wrap: wrap; gap: 4px; }
  #focusSel { max-width: 100%; }
  .kpi .v { font-size: 17px; }
  .legend-bar { flex-wrap: wrap; }
}
.topnav nav { min-width: 0; }
.legend-wrap { min-width: 0; }
.legend-wrap canvas { width: 100%; display: block; height: 12px; border-radius: 3px; }