:root {
  --bg: #1e1f22;
  --bg-2: #2a2c30;
  --bg-3: #36393f;
  --fg: #f1f1f1;
  --muted: #a3a6ad;
  --accent: #4caf50;
  --accent-2: #3d8f40;
  --warn: #f0a531;
  --danger: #d9534f;
  --line: red;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}

button, input, select {
  font: inherit;
  color: inherit;
}

button {
  background: var(--bg-3);
  border: 1px solid #4a4d55;
  border-radius: 4px;
  padding: 3px 8px;
  cursor: pointer;
  white-space: nowrap;
}
button:hover:not(:disabled) { background: #444852; }
button:disabled { opacity: .45; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent-2); color: #fff; }
button.primary:hover:not(:disabled) { background: var(--accent-2); }
button.danger { background: transparent; border-color: var(--danger); color: var(--danger); }
button.fix { border-color: var(--warn); color: var(--warn); font-weight: bold; }
button.icon { padding: 3px 8px; font-size: 18px; line-height: 1; }

input[type="text"], input[type="url"], input[type="password"], input[type="number"], select {
  background: var(--bg);
  border: 1px solid #4a4d55;
  border-radius: 4px;
  padding: 4px 8px;
}

/* --- Top bar --- */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 12px;
  background: var(--bg-2);
  border-bottom: 1px solid #000;
}
.brand { font-weight: bold; font-size: 18px; white-space: nowrap; }
.brand span { color: var(--accent); }
.seq-form { display: flex; gap: 6px; flex: 1; min-width: 0; }
.seq-form input { flex: 1; min-width: 0; }

.panel {
  position: absolute;
  z-index: 50;
  right: 12px;
  top: 52px;
  width: min(480px, calc(100vw - 24px));
  max-height: 60vh;
  overflow: auto;
  background: var(--bg-2);
  border: 1px solid #000;
  border-radius: 6px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .6);
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  border-bottom: 1px solid #000;
  position: sticky;
  top: 0;
  background: var(--bg-2);
}
.panel ul { list-style: none; margin: 0; padding: 0; }
.panel li { padding: 8px 12px; border-bottom: 1px solid #333; cursor: pointer; }
.panel li:hover { background: var(--bg-3); }
.panel li small { display: block; color: var(--muted); }

/* --- Viewer --- */
#viewer-container {
  position: relative;
  width: 100%;
  height: 68vh;
  background: #000;
}
#panorama { width: 100%; height: 100%; }

#crosshair {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}
#crosshair div { position: absolute; background: var(--line); opacity: .85; }
#crosshair .hline { top: 50%; left: 0; width: 100%; height: 2px; transform: translateY(-50%); }
#crosshair .vline { top: 0; left: 50%; width: 2px; height: 100%; transform: translateX(-50%); }

#hud {
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  background: rgba(0, 0, 0, .6);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}
#filename {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  font-size: 14px;
  background: rgba(0, 0, 0, .6);
  padding: 4px 12px;
  border-radius: 4px;
  max-width: 95%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#filename a { color: #9cd3ff; }
#filename .badge {
  display: inline-block;
  margin-left: 8px;
  padding: 0 6px;
  border-radius: 3px;
  background: var(--warn);
  color: #000;
  font-size: 12px;
  font-weight: bold;
}

.empty {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 16px;
  background: var(--bg);
  text-align: left;
}
.empty h1 { font-size: 22px; text-align: center; }
.empty ol { max-width: 640px; line-height: 1.7; }

/* --- Controls --- */
.controls { padding: 10px 12px 20px; text-align: center; }
.controls.disabled { opacity: .4; pointer-events: none; }
.nav-row, .save-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 6px;
}
.sep { flex: 0 0 18px; }
.counter input { width: 70px; text-align: center; }

.axes {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px 40px;
  margin: 10px 0;
}
.axis h3 { margin: 6px 0; font-size: 16px; }
.axis h3 output { font-variant-numeric: tabular-nums; color: var(--accent); }
.axis h3 small { color: var(--muted); font-weight: normal; margin-left: 6px; }
.axis .btns { display: flex; gap: 4px; justify-content: center; flex-wrap: wrap; }
.axis input[type="range"] { width: 100%; margin-top: 6px; accent-color: var(--accent); }

.status { color: var(--muted); margin-right: 8px; }
.status.ok { color: var(--accent); }
.status.err { color: var(--danger); }

.help { margin-top: 12px; color: var(--muted); display: inline-block; text-align: left; }
.help summary { cursor: pointer; text-align: center; }
.help ul { columns: 2; column-gap: 32px; padding-left: 18px; margin: 8px 0; }
.help kbd {
  display: inline-block;
  min-width: 20px;
  padding: 0 5px;
  border: 1px solid #555;
  border-radius: 3px;
  background: var(--bg-3);
  color: var(--fg);
  text-align: center;
  font-family: inherit;
}

/* --- Overlays --- */
.loader-overlay {
  position: fixed;
  inset: 0;
  margin: auto;
  width: fit-content;
  height: fit-content;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 24px 40px;
  background: rgba(0, 0, 0, .88);
  border: 1px solid var(--accent);
  border-radius: 6px;
  box-shadow: 0 0 100px rgba(0, 0, 0, .9);
  font-size: 18px;
}
.spinner {
  width: 32px;
  height: 32px;
  border: 4px solid #f3f3f3;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  z-index: 1001;
  max-width: calc(100vw - 32px);
  padding: 10px 18px;
  border-radius: 6px;
  background: var(--bg-3);
  border: 1px solid #000;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .5);
}
.toast.err { border-color: var(--danger); }
.toast.ok { border-color: var(--accent); }

/* --- Settings dialog --- */
dialog {
  width: min(520px, calc(100vw - 32px));
  background: var(--bg-2);
  color: var(--fg);
  border: 1px solid #000;
  border-radius: 8px;
  padding: 18px 20px;
}
dialog::backdrop { background: rgba(0, 0, 0, .6); }
dialog h2 { margin-top: 0; }
dialog label { display: block; margin-bottom: 14px; }
dialog label > input, dialog label > select, dialog .row { display: flex; width: 100%; margin-top: 4px; gap: 6px; }
dialog .row input { flex: 1; min-width: 0; }
dialog label.check { display: flex; gap: 8px; align-items: center; }
dialog small, .note { color: var(--muted); font-size: 13px; }
dialog code { color: var(--fg); }
.dialog-actions { display: flex; gap: 8px; align-items: center; justify-content: flex-end; }
.dialog-actions .sep { flex: 1; }

@media (max-width: 700px) {
  .topbar { flex-wrap: wrap; }
  .seq-form { order: 3; flex-basis: 100%; }
  #viewer-container { height: 55vh; }
  .help ul { columns: 1; }
}

.overlay-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 3;
  background: rgba(0, 0, 0, .6);
}
.axis-fix { display: flex; flex-direction: column; justify-content: center; }
.axis-fix small { color: var(--muted); margin-top: 6px; }
#filename .badge.warn { background: var(--danger); color: #fff; }