:root {
  /* RF Lab brand — dark RF/tech theme (rflab.io) */
  --bg:        #070a0e;
  --bg-2:      #0b1117;
  --panel:     #101820;
  --panel-2:   #14202a;
  --border:    #1d2c38;
  --text:      #e6edf5;
  --text-dim:  #93a1b1;
  --text-2:    #5f6b78;
  --accent:    #2de2a6;   /* signal green */
  --accent-2:  #38c7e6;   /* cyan */
  --signal-glow: rgba(45,226,166,.32);
  --warning:   #ffb454;
  --shadow:    0 4px 18px rgba(0,0,0,.5);
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  /* AMSL height tiers (must match map.js HEIGHT_TIERS) */
  --t0: #3a7bd5;   /* < 800 ft  */
  --t1: #2ecc71;   /* 800–1100  */
  --t2: #f1c40f;   /* 1100–1400 */
  --t3: #e67e22;   /* 1400–1700 */
  --t4: #e74c3c;   /* 1700–2200 */
  --t5: #b15cff;   /* > 2200 ft */
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

#app { display: flex; height: 100vh; height: 100dvh; position: relative; }

/* Floating menu button — opens the off-canvas drawer (shown on mobile only) */
#sidebar-toggle {
  display: none;
  position: fixed; top: 10px; right: 10px; z-index: 1250;
  width: 40px; height: 40px; border-radius: 8px; cursor: pointer;
  background: var(--panel); color: var(--text); border: 1px solid var(--border);
  font-size: 18px; align-items: center; justify-content: center; box-shadow: var(--shadow);
}
#sidebar-toggle:active { transform: scale(.95); border-color: var(--accent); color: var(--accent); }

/* ───────────────────────── Sidebar ───────────────────────── */
#sidebar {
  width: 350px;
  min-width: 350px;
  height: 100%;
  overflow-y: auto;
  background: var(--bg);
  border-right: 1px solid var(--border);
  padding: 0 0 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  transition: margin-left .25s ease;
}
#sidebar::-webkit-scrollbar { width: 8px; }
#sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

#sidebar header {
  padding: 18px 18px 14px;
  background: linear-gradient(160deg, #0c2a22 0%, var(--bg) 72%);
  border-bottom: 1px solid var(--border);
}
#sidebar h1 {
  font-size: 18px; margin: 0; letter-spacing: .2px;
  color: #fff;
}
.subtitle { margin: 4px 0 0; font-size: 12px; color: var(--text-dim); }

.panel {
  margin: 12px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.panel h2 {
  font-size: 12px; text-transform: uppercase; letter-spacing: .8px;
  color: var(--accent); margin: 0 0 10px;
}
.hint { font-size: 11px; color: var(--text-dim); line-height: 1.5; margin: 8px 0 0; }

/* Data freshness */
#data-freshness { padding: 10px 14px; }
.freshness-row { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-dim); }
.dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2);
  flex: 0 0 auto;
}

/* Stats */
.stat-grid { display: flex; gap: 8px; }
.stat {
  flex: 1; text-align: center; background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px; padding: 8px 4px;
}
.stat span { display: block; font-size: 19px; font-weight: 700; color: #fff; }
.stat label { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .4px; }

/* Controls */
.ctl-label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: 12px; color: var(--text); margin: 12px 0 4px;
}
.ctl-label output { color: var(--accent-2); font-variant-numeric: tabular-nums; font-weight: 600; }

input[type=range] {
  width: 100%; appearance: none; height: 5px; border-radius: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) 0%, var(--border) 0%);
  outline: none; margin: 2px 0 4px;
}
input[type=range]::-webkit-slider-thumb {
  appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 3px solid var(--accent); cursor: pointer; margin-top: -1px;
}
input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px; border-radius: 50%;
  background: #fff; border: 3px solid var(--accent); cursor: pointer;
}

.quick-row { display: flex; gap: 6px; margin-top: 10px; flex-wrap: wrap; }
.chip {
  flex: 1; min-width: 56px; font-size: 11px; padding: 6px 4px;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; cursor: pointer; transition: .15s;
}
.chip:hover { border-color: var(--accent); color: #fff; }
.chip.active { background: var(--accent); border-color: var(--accent); color: #04130d; }

/* Type filter grid */
.type-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 10px; }
.type-grid label {
  display: flex; align-items: center; gap: 6px; font-size: 12px; cursor: pointer;
  color: var(--text-dim);
}
.type-grid label:hover { color: var(--text); }
.type-grid input { accent-color: var(--accent); }
.type-grid .count { margin-left: auto; font-size: 10px; color: var(--text-dim); }

/* Switch */
.switch { display: flex; align-items: center; gap: 9px; font-size: 13px; cursor: pointer; }
.switch input { width: 38px; height: 20px; appearance: none; background: var(--border);
  border-radius: 12px; position: relative; cursor: pointer; transition: .2s; flex: 0 0 auto; }
.switch input:checked { background: var(--accent); }
.switch input::after {
  content: ""; position: absolute; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; top: 2px; left: 2px; transition: .2s;
}
.switch input:checked::after { left: 20px; }

/* Legend */
.legend { list-style: none; margin: 0; padding: 0; }
.legend li { display: flex; align-items: center; gap: 9px; font-size: 12px; margin: 5px 0; color: var(--text-dim); }
.legend .swatch { width: 14px; height: 14px; border-radius: 50%; flex: 0 0 auto; border: 1px solid rgba(255,255,255,.25); }

/* Collapsible */
.collapse-toggle { cursor: pointer; user-select: none; }
.collapsible.closed .collapse-body { display: none; }

#sidebar footer { padding: 10px 16px 0; font-size: 10px; color: var(--text-dim); line-height: 1.5; }
.footer-brand { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 1px; }
.footer-brand a { color: var(--accent); font-weight: 600; text-decoration: none; }
.footer-brand a:hover { text-decoration: underline; }
.footer-brand .tagline { color: var(--text-2); font-style: italic; }
.fb-logo { height: 12px; width: auto; vertical-align: -2px; margin-right: 5px; opacity: .9; }

/* ───────────────────────── Map ───────────────────────── */
#map-wrap { position: relative; flex: 1 1 auto; min-width: 0; height: 100%; }
#map { width: 100%; height: 100%; background: #0a0e14; }

/* Leaflet popup dark theme */
.leaflet-popup-content-wrapper, .leaflet-popup-tip {
  background: var(--panel); color: var(--text);
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.leaflet-popup-content { margin: 12px 14px; font-size: 12.5px; line-height: 1.5; max-width: 290px; }
.leaflet-container a { color: var(--accent); }

.tower-popup h3 { margin: 0 0 6px; font-size: 14px; color: #fff; }
.tower-popup .badge {
  display: inline-block; font-size: 10px; padding: 1px 7px; border-radius: 10px;
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text-dim);
  margin: 0 4px 6px 0;
}
.tower-popup .badge.amsl { color: #061018; font-weight: 700; border: 0; }
.tower-popup table { width: 100%; border-collapse: collapse; margin: 4px 0; }
.tower-popup td { padding: 2px 0; vertical-align: top; }
.tower-popup td.k { color: var(--text-dim); white-space: nowrap; padding-right: 10px; }
.tower-popup .owner-block {
  margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border);
}
.tower-popup .owner-block .name { font-weight: 600; color: #fff; }
.tower-popup .links { margin-top: 8px; display: flex; gap: 12px; flex-wrap: wrap; }
.tower-popup .reach { font-size: 11px; color: var(--accent-2); margin-top: 6px; }

/* Leaflet layer control dark */
.leaflet-control-layers, .leaflet-bar a {
  background: var(--panel); color: var(--text); border-color: var(--border);
}
.leaflet-control-layers-expanded { color: var(--text); padding: 8px 10px; }
.leaflet-control-attribution {
  background: rgba(13,17,23,.8) !important; color: var(--text-dim) !important;
}
.leaflet-control-attribution a { color: var(--accent) !important; }

/* ── Planner: tools, nodes, routes ── */
.tool-row { display: flex; gap: 6px; flex-wrap: wrap; }
.tool {
  flex: 1; min-width: 70px; font-size: 12px; padding: 7px 6px;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; cursor: pointer; transition: .15s; white-space: nowrap;
}
.tool:hover { border-color: var(--accent); color: #fff; }
.tool.armed { background: var(--accent); border-color: var(--accent); color: #04130d; box-shadow: 0 0 12px var(--signal-glow); }
.tool.primary { background: var(--accent-2); border-color: var(--accent-2); color: #06231b; font-weight: 700; }
.tool.primary:hover { filter: brightness(1.1); color: #06231b; }
.tool:disabled { opacity: .45; cursor: not-allowed; }
#btn-route { flex: 1 1 auto; }
#btn-clear-plan { flex: 0 0 auto; }

.planner-status { font-size: 11px; color: var(--accent-2); min-height: 14px; margin: 8px 0 0; }
.planner-status.warn { color: #ffb454; }

.select {
  width: 100%; padding: 7px 8px; background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 6px; font-size: 12px;
}

.nodes-list { margin-top: 8px; display: flex; flex-direction: column; gap: 5px; }
.node-item {
  display: flex; align-items: center; gap: 6px; font-size: 12px;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; padding: 5px 7px;
}
.node-item .nm { flex: 1; background: transparent; border: 0; color: #fff; font-size: 12px; min-width: 0; }
.node-item .nm:focus { outline: 1px solid var(--accent); border-radius: 3px; }
.node-item .h { width: 46px; background: var(--panel); border: 1px solid var(--border); color: var(--text-dim); font-size: 11px; border-radius: 4px; padding: 2px 3px; }
.node-item .x { cursor: pointer; color: var(--text-dim); border: 0; background: transparent; font-size: 14px; }
.node-item .x:hover { color: #e74c3c; }
.node-item .rx { cursor: pointer; color: var(--accent-2); border: 0; background: transparent; font-size: 13px; }

.route-result { margin-top: 10px; font-size: 12px; }
.route-result .rsum {
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 10px; margin-bottom: 8px;
}
.route-result .rsum b { color: #fff; font-size: 15px; }
.route-result .hop {
  display: flex; gap: 8px; align-items: baseline; padding: 4px 2px;
  border-bottom: 1px solid var(--border); cursor: pointer;
}
.route-result .hop:hover { background: var(--panel-2); }
.route-result .hop .seg { color: var(--accent); white-space: nowrap; }
.route-result .hop .meta { color: var(--text-dim); margin-left: auto; }
.verdict-clear { color: #2ecc71; } .verdict-fresnel-obstructed { color: #f1c40f; }
.verdict-weak-signal { color: #e67e22; } .verdict-terrain-blocked, .verdict-out-of-range { color: #e74c3c; }

.param-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; }
.param-grid label { display: flex; flex-direction: column; font-size: 10px; color: var(--text-dim); gap: 2px; }
.param-grid input { width: 72px; background: var(--panel-2); border: 1px solid var(--border); color: var(--text); border-radius: 5px; padding: 4px 6px; font-size: 12px; }

/* Popup action buttons */
.tower-popup .actions { margin-top: 8px; display: flex; gap: 6px; }
.tower-popup .actions button {
  flex: 1; font-size: 11px; padding: 4px; cursor: pointer; border-radius: 5px;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
}
.tower-popup .actions button:hover { border-color: var(--accent); color: #fff; }
.tower-popup .ah-row { display: flex; align-items: center; gap: 6px; margin-top: 8px; font-size: 11px; color: var(--text-dim); }
.tower-popup .ah-input { width: 58px; background: var(--panel-2); border: 1px solid var(--border); color: var(--text); border-radius: 4px; padding: 3px 5px; font-size: 12px; }
.tower-popup .ah-note { font-size: 10px; color: var(--text-dim); }

/* Known systems (FCC ULS) in the tower popup */
.tower-popup .sys-block { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border); }
.sys-head { font-size: 11px; color: var(--accent-2); font-weight: 700; text-transform: uppercase; letter-spacing: .4px; }
.sys-head .sys-load { color: var(--text-dim); font-weight: 400; text-transform: none; letter-spacing: 0; }
.sys-n { background: var(--accent-2); color: #04130d; border-radius: 8px; padding: 0 6px; font-size: 10px; margin-left: 4px; }
.sys-list { max-height: 200px; overflow-y: auto; margin-top: 6px; }
.sys { padding: 5px 0; border-bottom: 1px solid var(--border); }
.sys:last-child { border-bottom: 0; }
.sys-r { font-size: 11.5px; line-height: 1.45; }
.sys-r b { color: #fff; }
.sys-tag { font-size: 9px; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 0 5px; color: var(--text-dim); }
.sys-call { color: var(--text-dim); font-size: 10px; font-family: var(--font-mono); }
.sys-x { font-size: 9px; color: var(--warning); }
.sys-fq { font-size: 11px; color: var(--text-dim); font-family: var(--font-mono); margin-top: 2px; line-height: 1.5; }
.sys-fq .e { color: var(--accent); } .sys-fq .em { color: var(--text-2); }
.sys-az { font-size: 10px; color: var(--accent-2); margin-top: 2px; }
.sys-more { font-size: 10px; color: var(--text-2); }
.sys-empty { font-size: 11px; color: var(--text-dim); }

/* Tower status checkboxes */
.chk-row { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--text-dim); cursor: pointer; margin: 5px 0; }
.chk-row input { accent-color: var(--accent); flex: 0 0 auto; }
.chk-row:hover { color: var(--text); }
.dim-note { color: var(--text-2); font-size: 10px; }

/* Node / endpoint markers */
.node-icon {
  width: 16px; height: 16px; border-radius: 50%; border: 2px solid #fff;
  box-shadow: 0 0 6px rgba(0,0,0,.6);
}
.node-icon.user { background: #00d4a0; }
.node-icon.ep-a { background: #2ecc71; width: 22px; height: 22px; font: 700 12px/19px sans-serif; color: #06231b; text-align: center; }
.node-icon.ep-b { background: #e74c3c; width: 22px; height: 22px; font: 700 12px/19px sans-serif; color: #fff; text-align: center; }

/* Floating terrain-profile panel */
#profile-panel {
  position: absolute; left: 50%; transform: translateX(-50%); bottom: 14px; z-index: 1200;
  width: min(700px, calc(100% - 40px));
  background: var(--panel); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: var(--shadow); padding: 8px 10px 10px;
}
#profile-panel.hidden { display: none; }
.profile-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 4px; }
#profile-title { font-size: 12px; color: var(--accent); font-weight: 600; }
#profile-close { background: transparent; border: 0; color: var(--text-dim); cursor: pointer; font-size: 15px; }
#profile-close:hover { color: #fff; }
#profile-canvas { width: 100%; height: auto; display: block; background: #0a0e14; border-radius: 6px; }
.profile-caption { font-size: 11px; color: var(--text-dim); margin-top: 6px; line-height: 1.5; }

/* ============================================================
   Responsive — phones & small tablets: off-canvas drawer
   (body.nav-open = drawer shown; default = hidden)
   ============================================================ */
@media (max-width: 820px) {
  body { touch-action: pan-x pan-y; -webkit-user-select: none; user-select: none; -webkit-touch-callout: none; }

  #sidebar-toggle { display: flex; }

  #sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: 86vw; max-width: 330px; min-width: 0; height: auto;
    transform: translateX(-100%);
    transition: transform .28s cubic-bezier(.4, 0, .2, 1);
    z-index: 1200; box-shadow: 2px 0 22px rgba(0,0,0,.7);
  }
  body.nav-open #sidebar { transform: none; }

  /* Backdrop scrim over the map while the drawer is open */
  #app::before {
    content: ""; position: fixed; inset: 0;
    background: rgba(0,0,0,.5); opacity: 0; visibility: hidden;
    transition: opacity .25s; z-index: 1150;
  }
  body.nav-open #app::before { opacity: 1; visibility: visible; }

  #map-wrap { width: 100%; }

  /* Keep the Leaflet layer control clear of the floating menu button (top-right) */
  .leaflet-top.leaflet-right { top: 58px; }

  /* Larger touch targets */
  input[type=range] { height: 8px; }
  input[type=range]::-webkit-slider-thumb { width: 20px; height: 20px; margin-top: -6px; }
  input[type=range]::-moz-range-thumb { width: 18px; height: 18px; }
  .chip { min-height: 40px; }
  .tool { min-height: 42px; padding: 10px 8px; }
  .switch input { width: 44px; height: 24px; }
  .switch input:checked::after { left: 22px; }
  .node-item .x, .node-item .rx { min-width: 34px; min-height: 34px; }

  /* Stack RF params on narrow screens */
  .param-grid { grid-template-columns: 1fr; }
  .param-grid label { flex-direction: row; justify-content: space-between; align-items: center; }
  .param-grid input { width: 96px; }

  /* Terrain profile chart -> bottom sheet */
  #profile-panel {
    left: 0; right: 0; bottom: 0; width: 100%;
    transform: none; border-radius: 14px 14px 0 0;
    max-height: 52vh; overflow-y: auto; z-index: 1100;
  }

  /* Leaflet: keep controls finger-sized + tidy */
  .leaflet-control-zoom a { width: 40px; height: 40px; line-height: 40px; font-size: 18px; }
  .leaflet-control-attribution { font-size: 9px; }
  .leaflet-popup-content { max-width: calc(100vw - 56px); }
}

/* Very small phones — stack the stat tiles */
@media (max-width: 430px) {
  .stat-grid { flex-direction: column; }
  .stat { padding: 7px; }
  .brand-word { font-size: 16px; }
}