:root {
  --bg:        #0F172A;
  --bg-2:      #131F36;
  --bg-3:      #1A2742;
  --bg-card:   #15233F;
  --bg-elev:   #1B2A48;
  --bd:        #2A3D63;
  --t1:        #F8FAFC;
  --t2:        #CBD5E1;
  --t3:        #94A3B8;
  --t4:        #64748B;
  --accent:    #FF6A00;
  --accent-h:  #FF8C00;
  --accent-bg: rgba(255,106,0,.14);
  --blue:      #4A8BFF;
  --blue-bg:   rgba(74,139,255,.14);
  --green:     #3FB950;
  --green-bg:  rgba(63,185,80,.14);
  --red:       #FF7B72;
  --red-bg:    rgba(255,123,114,.14);
  --yellow:    #FFA657;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.35);
  --shadow:    0 6px 18px rgba(0,0,0,.30);
  --shadow-lg: 0 16px 40px rgba(0,0,0,.45);
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #F5F7FA; --bg-2: #EAEFF6; --bg-3: #DFE6F0;
  --bg-card: #FFFFFF; --bg-elev: #FFFFFF;
  --bd: #D7DEE9;
  --t1: #0F172A; --t2: #334155; --t3: #64748B; --t4: #94A3B8;
  --accent-bg: rgba(255,106,0,.10);
  --blue-bg: rgba(46,111,216,.08);
  --green-bg: rgba(34,139,82,.10); --green: #228B52;
  --red-bg: rgba(220,38,38,.08); --red: #DC2626;
  color-scheme: light;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
img { max-width: 100%; height: auto; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--t2);
  font-size: 16px;
  line-height: 1.5;
  min-height: 100vh; min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
}
.mono { font-family: 'SF Mono', Menlo, 'Cascadia Code', Consolas, monospace; font-size: .92rem; letter-spacing: .02em; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: 16px; }

.app {
  max-width: 1400px;
  margin: 0 auto;
  padding: 18px 22px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 4px 22px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-mark {
  font-size: 1.6rem;
  width: 50px; height: 50px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-bg);
  border: 1px solid var(--accent);
  border-radius: 14px;
}
.brand-name { font-size: 1.35rem; font-weight: 800; color: var(--t1); letter-spacing: -.4px; }
.brand-name em { font-style: normal; color: var(--accent); }
.brand-sub { font-size: .75rem; color: var(--t3); margin-top: 2px; }
.theme-btn {
  background: transparent;
  border: 1px solid var(--bd);
  border-radius: 10px;
  width: 44px; height: 44px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  color: var(--t1);
}
.theme-btn:hover { background: var(--bg-3); }

.tabs {
  display: flex;
  gap: 4px;
  padding: 5px;
  background: var(--bg-card);
  border: 1px solid var(--bd);
  border-radius: 14px;
  margin-bottom: 20px;
  max-width: 520px;
}
.tab {
  flex: 1;
  background: transparent;
  border: none;
  padding: 12px 18px;
  border-radius: 9px;
  color: var(--t3);
  font-weight: 600;
  font-size: .94rem;
  transition: all .15s;
}
.tab.active { background: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(255,106,0,.3); }
.tab:not(.active):hover { background: var(--bg-3); color: var(--t1); }

/* Two-column split layout */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 980px) {
  .split { grid-template-columns: minmax(420px, 460px) 1fr; }
  .split-form { min-width: 0; }
  .split-map  { min-width: 0; position: sticky; top: 14px; align-self: start; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--bd);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.card-title { font-size: 1.05rem; font-weight: 800; color: var(--t1); margin-bottom: 4px; }
.card-sub { font-size: .82rem; color: var(--t3); margin-bottom: 18px; line-height: 1.5; }

.field { margin-bottom: 14px; }
.field-label {
  display: block;
  font-size: .76rem;
  font-weight: 700;
  color: var(--t2);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.field-hint { font-size: .74rem; color: var(--t4); margin-top: 4px; }
.input {
  width: 100%;
  background: var(--bg-3);
  color: var(--t1);
  border: 1px solid var(--bd);
  border-radius: 10px;
  padding: 11px 14px;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
.input::placeholder { color: var(--t4); }

.select {
  width: 100%;
  background: var(--bg-3);
  color: var(--t1);
  border: 1px solid var(--bd);
  border-radius: 10px;
  padding: 11px 14px;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
  cursor: pointer;
}
.select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 480px) {
  .grid-2 { grid-template-columns: 1fr; gap: 0; }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 22px;
  border-radius: 10px;
  border: none;
  font-size: .98rem;
  font-weight: 700;
  width: 100%;
  transition: filter .15s, transform .1s, background .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 14px rgba(255,106,0,.3); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; box-shadow: none; }
.btn-ghost { background: transparent; color: var(--t1); border: 1px solid var(--bd); }
.btn-ghost:hover { background: var(--bg-3); }
.btn-danger { background: var(--red); color: #fff; }

.btn-icon-mini {
  background: var(--bg-3);
  border: 1px solid var(--bd);
  color: var(--t1);
  border-radius: 8px;
  width: 32px; height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.btn-icon-mini:hover { background: var(--accent-bg); border-color: var(--accent); }

.result {
  margin-top: 14px;
  padding: 14px;
  background: var(--bg-3);
  border-radius: 10px;
  border-left: 3px solid var(--accent);
}
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--bd);
}
.result-row:last-of-type { border-bottom: none; }
.result-label { font-size: .76rem; font-weight: 700; color: var(--t3); text-transform: uppercase; letter-spacing: .5px; }
.result-val { font-size: .92rem; color: var(--t1); font-weight: 600; text-align: right; word-break: break-all; }

.result-actions {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.result-actions .btn { flex: 1; min-width: 130px; }

/* Visual cue that a field is locked / read-only */
.input[readonly] {
  background: var(--bg-2);
  color: var(--t2);
  cursor: not-allowed;
  border-style: dashed;
}
.input[readonly]:focus {
  border-color: var(--bd);
  box-shadow: none;
}

.example-row {
  margin-top: 14px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}
.example-label { font-size: .76rem; color: var(--t3); margin-right: 4px; }
.example-btn {
  background: var(--bg-3);
  border: 1px solid var(--bd);
  color: var(--t2);
  font-size: .8rem;
  padding: 5px 11px;
  border-radius: 999px;
}
.example-btn:hover { background: var(--accent-bg); border-color: var(--accent); color: var(--accent); }

/* Map card */
.map-card {
  background: var(--bg-card);
  border: 1px solid var(--bd);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.map-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--bd);
  background: var(--bg-card);
}
.map-toolbar-title { font-size: .85rem; font-weight: 700; color: var(--t1); }
.leaflet-map {
  width: 100%;
  height: 420px;
  background: var(--bg-3);
}
@media (min-width: 980px) {
  .leaflet-map { height: 460px; }
}
@media (max-width: 600px) {
  .leaflet-map { height: 300px; }
}

/* Project overlay checkboxes */
.project-overlay-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 220px;
  overflow-y: auto;
}
.project-overlay-empty {
  padding: 12px;
  background: var(--bg-3);
  border-radius: 8px;
  text-align: center;
  font-size: .8rem;
  color: var(--t3);
}
.project-overlay-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: var(--bg-3);
  border: 1px solid var(--bd);
  border-radius: 8px;
  cursor: pointer;
  font-size: .85rem;
  user-select: none;
  transition: background .12s;
}
.project-overlay-item:hover { background: var(--bg-elev); }
.project-overlay-item input[type="checkbox"] {
  margin: 0;
  cursor: pointer;
  accent-color: var(--accent);
}
.project-overlay-item-swatch {
  width: 14px; height: 14px;
  border-radius: 4px;
  flex-shrink: 0;
}
.project-overlay-item-name {
  flex: 1;
  color: var(--t1);
  font-weight: 600;
}
.project-overlay-item-meta {
  font-size: .7rem;
  color: var(--t3);
}
.project-overlay-item-del {
  background: transparent;
  border: none;
  color: var(--t4);
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
}
.project-overlay-item-del:hover { color: var(--red); background: var(--red-bg); }

/* Leaflet dark theme overrides (only when dark) */
html:not([data-theme="light"]) .leaflet-tile-pane {
  filter: brightness(0.7) saturate(0.9) hue-rotate(180deg) invert(0.94);
}
.leaflet-container {
  background: var(--bg-3) !important;
  font-family: inherit;
}
.leaflet-control-attribution {
  background: rgba(0,0,0,.5) !important;
  color: #fff !important;
  font-size: 10px !important;
  padding: 2px 5px !important;
}
.leaflet-control-attribution a { color: #FFA94D !important; }
html[data-theme="light"] .leaflet-control-attribution {
  background: rgba(255,255,255,.85) !important;
  color: #334155 !important;
}
html[data-theme="light"] .leaflet-control-attribution a { color: #FF6A00 !important; }
.leaflet-control-zoom a {
  background: var(--bg-card) !important;
  color: var(--t1) !important;
  border: 1px solid var(--bd) !important;
}
.leaflet-control-zoom a:hover {
  background: var(--bg-3) !important;
}

/* Custom marker for LOS points */
.los-marker {
  width: 32px !important;
  height: 32px !important;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  font-size: .95rem;
  display: flex !important;
  align-items: center;
  justify-content: center;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,.4);
  cursor: grab;
}
.los-marker.b { background: var(--blue); }
.los-marker.c { background: var(--green); }
.los-marker.d { background: #B084FF; }
.los-marker:active { cursor: grabbing; }

.overlay-marker {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  color: #fff;
  font-weight: 800;
  font-size: .75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.4);
  opacity: .85;
}

/* Profile list */
.profile-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.profile-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-3);
  border: 1px solid var(--bd);
  border-radius: 10px;
  padding: 10px 12px;
}
.profile-item-name {
  font-weight: 700;
  color: var(--t1);
  font-size: .9rem;
  flex-shrink: 0;
  min-width: 90px;
}
.profile-item-coord {
  flex: 1;
  font-family: 'SF Mono', Menlo, monospace;
  font-size: .8rem;
  color: var(--t2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.profile-item-meta {
  font-size: .7rem;
  color: var(--t3);
  flex-shrink: 0;
}
.profile-item-del {
  background: transparent;
  border: 1px solid var(--bd);
  color: var(--red);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: .8rem;
  flex-shrink: 0;
}
.profile-item-del:hover { background: var(--red-bg); }
.profile-empty {
  padding: 14px;
  background: var(--bg-3);
  border-radius: 10px;
  text-align: center;
  font-size: .82rem;
  color: var(--t3);
}

/* LOS point block */
.los-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.los-point {
  background: var(--bg-3);
  border: 1px solid var(--bd);
  border-radius: 12px;
  padding: 14px;
}
.los-point-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.los-point-tag {
  width: 30px; height: 30px;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.los-point-tag.b { background: var(--blue); }
.los-point-tag.c { background: var(--green); }
.los-point-tag.d { background: #B084FF; }
.los-point-head .input { flex: 1; }
.los-point-remove {
  background: transparent;
  border: 1px solid var(--bd);
  color: var(--red);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: .82rem;
  flex-shrink: 0;
}
.los-point-remove:hover { background: var(--red-bg); }

.los-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.los-stat {
  background: var(--bg-3);
  border: 1px solid var(--bd);
  border-radius: 10px;
  padding: 11px 14px;
}
.los-stat-label { font-size: .7rem; color: var(--t3); text-transform: uppercase; letter-spacing: .5px; }
.los-stat-value { font-size: 1.05rem; font-weight: 800; color: var(--t1); margin-top: 3px; }
.los-stat.clear { border-left: 3px solid var(--green); }
.los-stat.blocked { border-left: 3px solid var(--red); }
.los-stat.clear .los-stat-value { color: var(--green); }
.los-stat.blocked .los-stat-value { color: var(--red); }

.los-chart-wrap {
  background: var(--bg-3);
  border: 1px solid var(--bd);
  border-radius: 12px;
  padding: 14px;
  overflow-x: auto;
}
#los-chart { width: 100%; max-width: 100%; display: block; }

.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Modal */
.rf-modal-overlay {
  position: fixed; inset: 0; z-index: 10001;
  background: rgba(15,23,42,.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn .15s ease;
}
.rf-modal {
  background: var(--bg-card);
  border: 1px solid var(--bd);
  border-radius: 14px;
  padding: 22px;
  max-width: 520px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}
@keyframes fadeIn { from { opacity: 0 } to { opacity: 1 } }

/* Toast */
.rf-toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-card);
  border: 1px solid var(--bd);
  color: var(--t1);
  padding: 13px 20px;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  z-index: 10000;
  opacity: 0;
  pointer-events: none;
  transition: opacity .22s ease, transform .22s ease;
  max-width: min(90vw, 460px);
  font-size: .92rem;
  font-weight: 500;
  text-align: center;
}
.rf-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.rf-toast-error { border-left: 4px solid var(--red); }
.rf-toast-warn  { border-left: 4px solid var(--yellow); }
.rf-toast-ok    { border-left: 4px solid var(--green); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }