/* RCS Scanner — dark briefing theme */
:root {
  --bg: #0d1420;
  --bg-panel: #131c2b;
  --bg-raised: #1a2536;
  --border: #263449;
  --text: #dbe4f0;
  --text-dim: #8595ab;
  --accent: #35d0e0;
  --accent-dim: #1d7b86;
  --amber: #f5a623;
  --danger: #e0564f;
  --shape-fill: rgba(53, 208, 224, 0.16);
  --shape-edge: #4fd8e8;
  --ram-fill: #232a33;
  --ram-edge: #566274;
  font-size: 15px;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 15px;
}

#app {
  display: grid;
  grid-template-columns: 56px 1fr 320px;
  grid-template-rows: 48px 1fr;
  grid-template-areas: "top top top" "rail main side";
  height: 100vh;
}

/* ---------- top bar ---------- */
#topbar {
  grid-area: top;
  display: flex; align-items: center; gap: 8px;
  padding: 0 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}
/* Wind Tunnel-style brand: "RCS" white, "Scanner" accent — colors swap on hover. */
#appTitle { font-weight: 700; letter-spacing: 0.12em; color: var(--text); margin-right: 10px; text-decoration: none; }
#appTitle em { color: var(--accent); font-style: normal; }
#appTitle:hover { color: var(--accent); }
#appTitle:hover em { color: var(--text); }
#topbar .spacer { flex: 1; }
#freqChip {
  background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: 14px; padding: 4px 12px; font-size: 14px; color: var(--text-dim);
}

button {
  background: var(--bg-raised); color: var(--text);
  border: 1px solid var(--border); border-radius: 5px;
  padding: 5px 12px; font-size: 14px; cursor: pointer;
}
button:hover { border-color: var(--accent-dim); color: #fff; }
button:disabled { opacity: 0.45; cursor: default; }
button.primary { background: var(--accent-dim); border-color: var(--accent); font-weight: 600; }
button.primary:hover { background: var(--accent); color: #04222a; }
button.danger { background: #5c2320; border-color: var(--danger); }

/* ---------- tool rail ---------- */
#toolrail {
  grid-area: rail;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 10px 0;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
}
#toolrail button {
  width: 40px; height: 38px; padding: 0; font-size: 17px; line-height: 1;
}
#toolrail button.tool.on {
  background: var(--accent-dim); border-color: var(--accent); color: #fff;
}
.rail-sep { width: 28px; border-top: 1px solid var(--border); margin: 6px 0; }

/* ---------- main canvas area ---------- */
#mainArea { grid-area: main; position: relative; overflow: hidden; }
#sceneCanvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
#sceneHint {
  position: absolute; top: 14px; left: 50%; transform: translateX(-50%);
  background: rgba(19,28,43,0.85); border: 1px solid var(--border); border-radius: 6px;
  padding: 6px 16px; font-size: 14px; color: var(--text-dim); pointer-events: none;
}

/* ---------- polar plot ---------- */
#polarBox {
  position: absolute; left: 14px; bottom: 14px;
  transition: left 0.25s ease;
  width: 380px;
  background: rgba(13, 20, 32, 0.88);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 6px;
}
#polarBox.expanded { width: 620px; }
/* keep the plot visible while the lesson panel overlays the left edge */
body.lesson-open #polarBox { left: 394px; }
#polarCanvas { display: block; width: 100%; aspect-ratio: 1; }
#polarButtons { display: flex; gap: 4px; margin-top: 4px; }
#polarButtons button { padding: 2px 8px; font-size: 12px; }

/* ---------- sidebar ---------- */
#sidebar {
  grid-area: side;
  overflow-y: auto;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  padding: 10px;
}
.panel { border: 1px solid var(--border); border-radius: 8px; padding: 10px 12px; margin-bottom: 10px; background: var(--bg); }
.panel h2 { margin: 0 0 8px; font-size: 14px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-dim); }
.row { display: flex; align-items: center; gap: 8px; margin: 7px 0; flex-wrap: wrap; }
.row label { font-size: 14px; min-width: 74px; }
.row input[type="range"] { flex: 1; min-width: 60px; accent-color: var(--accent); }
.row select, .row input[type="text"], .row input[type="number"] {
  background: var(--bg-raised); color: var(--text); border: 1px solid var(--border);
  border-radius: 4px; padding: 3px 6px; font-size: 14px;
}
.row input[type="number"] { width: 62px; }
.hint { color: var(--text-dim); font-size: 13px; }
progress { width: 100%; height: 8px; accent-color: var(--amber); }

button.seg { border-radius: 0; padding: 4px 10px; }
button.seg:first-child { border-radius: 5px 0 0 5px; }
button.seg + button.seg { border-left: none; border-radius: 0 5px 5px 0; }
button.seg.on { background: var(--accent-dim); border-color: var(--accent); color: #fff; }

/* trace list & stats */
#traceList .trace-row {
  display: flex; align-items: center; gap: 8px; margin: 4px 0; font-size: 14px;
}
.trace-chip { width: 14px; height: 14px; border-radius: 3px; flex: none; }
.trace-row .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.trace-row button { padding: 0 7px; font-size: 12px; }
#statsBody table { width: 100%; border-collapse: collapse; font-size: 13px; }
#statsBody td, #statsBody th { padding: 2px 4px; text-align: right; border-bottom: 1px solid var(--border); }
#statsBody th { color: var(--text-dim); font-weight: 600; }
#statsBody td:first-child, #statsBody th:first-child { text-align: left; }

/* ---------- lesson panel ---------- */
#lessonPanel {
  position: fixed; top: 48px; left: 56px; bottom: 0; width: 380px;
  background: var(--bg-panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; z-index: 30;
  box-shadow: 8px 0 24px rgba(0,0,0,0.45);
}
#lessonPanel[hidden] { display: none; }
#lessonPanel header, .modal-card header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
}
#lessonPanel h2, .modal-card h2 { margin: 0; font-size: 16px; }
#lessonStep { flex: 1; overflow-y: auto; padding: 14px 16px; line-height: 1.55; font-size: 15px; }
#lessonStep .observe {
  border-left: 3px solid var(--amber); background: rgba(245,166,35,0.08);
  padding: 8px 12px; margin: 10px 0; border-radius: 0 6px 6px 0; font-size: 14px;
}
#lessonStep .observe::before { content: "Observe: "; font-weight: 700; color: var(--amber); }
#lessonPanel footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-top: 1px solid var(--border);
}
.lesson-actions {
  display: flex; gap: 10px; justify-content: center; flex-wrap: wrap;
  margin: 12px 0;
}
button.apply-setup {
  background: var(--accent-dim); border-color: var(--accent);
  /* Fixed flex-centered height so emoji glyphs (📌) can't stretch one
     button taller than its neighbor. */
  height: 34px; display: inline-flex; align-items: center; line-height: 1;
}

/* ---------- modals ---------- */
.modal {
  position: fixed; inset: 0; z-index: 40;
  background: rgba(5, 9, 15, 0.7);
  display: flex; align-items: center; justify-content: center;
}
.modal[hidden] { display: none; }
.modal-card {
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 10px;
  width: 680px; max-width: 92vw; max-height: 84vh; display: flex; flex-direction: column;
}
.modal-card.wide { width: 860px; }
#presetGrid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 12px; padding: 14px; overflow-y: auto;
}
.preset-card {
  border: 1px solid var(--border); border-radius: 8px; background: var(--bg);
  padding: 8px; cursor: pointer; text-align: center;
}
.preset-card:hover { border-color: var(--accent); }
.preset-card canvas { width: 100%; background: #0a101a; border-radius: 5px; }
.preset-card .name { font-size: 14px; font-weight: 600; margin-top: 6px; }
.preset-card .desc { font-size: 12.5px; color: var(--text-dim); margin-top: 2px; line-height: 1.35; }
#helpBody { padding: 16px 22px; overflow-y: auto; line-height: 1.55; font-size: 14.5px; }
#helpBody h1 { font-size: 20px; } #helpBody h2 { font-size: 17px; margin-top: 1.2em; }
#helpBody code, #helpBody pre { background: var(--bg-raised); border-radius: 4px; padding: 1px 5px; font-size: 13px; }
#helpBody pre { padding: 10px; overflow-x: auto; }
#helpBody table { border-collapse: collapse; }
#helpBody td, #helpBody th { border: 1px solid var(--border); padding: 3px 10px; font-size: 13.5px; }
#lessonMenuList { padding: 12px; overflow-y: auto; }
.lesson-item {
  display: block; width: 100%; text-align: left; margin: 6px 0; padding: 10px 14px;
}
.lesson-item .t { font-weight: 600; }
.lesson-item .d { color: var(--text-dim); font-size: 13.5px; margin-top: 2px; }

/* ---------- welcome modal ---------- */
.modal-card.welcome { width: 640px; }
.welcome-sub { margin: 12px 18px 0; color: var(--text-dim); font-size: 14.5px; line-height: 1.5; }
#welcomeBody { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 16px 18px 20px; }
.welcome-opt {
  text-align: left; padding: 18px 16px; border-radius: 10px; line-height: 1.45;
  background: var(--bg); border: 1px solid var(--border);
}
.welcome-opt:hover { border-color: var(--accent); background: var(--bg-raised); }
.welcome-opt .t { font-size: 17px; font-weight: 700; color: var(--accent); margin-bottom: 7px; }
.welcome-opt .d { color: var(--text-dim); font-size: 13.5px; }

/* ---------- file:// warning ---------- */
#fileWarning {
  position: fixed; inset: 0; z-index: 100; background: var(--bg);
  align-items: center; justify-content: center; display: flex;
}
#fileWarning .card {
  max-width: 560px; background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 26px 34px; line-height: 1.6;
}
#fileWarning h1 { color: var(--amber); margin-top: 0; }
#fileWarning pre {
  background: var(--bg-raised); padding: 10px 14px; border-radius: 6px; font-size: 16px;
}