:root {
  --bg: #14161a;
  --panel: #1c1f26;
  --border: #2c3038;
  --text: #e6e8eb;
  --dim: #8a8f98;
  --accent: #5aa9ff;
  --accent-dim: #2d5a8c;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

#topbar {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

#brand {
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
}

#brand-sub {
  color: var(--dim);
  font-weight: 400;
}

#loaders {
  display: flex;
  gap: 8px;
}

.file-btn {
  position: relative;
  display: inline-block;
  padding: 6px 12px;
  background: var(--accent-dim);
  color: var(--text);
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
  border: 1px solid var(--border);
}

.file-btn:hover {
  background: var(--accent);
}

.file-btn-secondary {
  background: transparent;
}

.file-btn-secondary:hover {
  background: var(--panel);
  border-color: var(--dim);
}

.file-btn input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

#settings-toggle {
  padding: 6px 12px;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
}

#settings-toggle:hover {
  background: var(--panel);
  border-color: var(--dim);
}

#settings-toggle.hidden {
  display: none;
}

.opt-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.opt-toggle input[type="checkbox"] {
  accent-color: var(--accent);
  cursor: pointer;
}

.opt-toggle.hidden,
.opt-row.hidden {
  display: none;
}

.opt-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  color: var(--text);
}

.opt-row select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 3px 6px;
}

.opt-slider {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 12px;
  color: var(--dim);
  margin-bottom: 10px;
  position: relative;
}

.opt-slider .opt-val {
  position: absolute;
  right: 0;
  top: 0;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.opt-slider input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
  cursor: pointer;
}

#meta {
  display: flex;
  gap: 16px;
  font-size: 12px;
  color: var(--dim);
  margin-left: auto;
}

#meta.hidden {
  display: none;
}

#stage {
  position: relative;
  flex: 1;
  overflow: hidden;
}

#empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--dim);
  padding: 0 20px;
}

#empty-state.hidden {
  display: none;
}

#empty-state code {
  color: var(--accent);
  background: var(--panel);
  padding: 2px 6px;
  border-radius: 3px;
}

#empty-state .hint {
  max-width: 460px;
  font-size: 13px;
}

#map-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  cursor: grab;
}

#map-canvas.dragging {
  cursor: grabbing;
}

#map-canvas.hidden {
  display: none;
}

#tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 12px;
  transform: translate(-50%, calc(-100% - 10px));
  white-space: nowrap;
}

#tooltip.hidden {
  display: none;
}

#coords {
  position: absolute;
  left: 10px;
  bottom: 10px;
  background: rgba(20, 22, 26, 0.75);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 12px;
  color: var(--dim);
  pointer-events: none;
}

#coords.hidden {
  display: none;
}

#scalebar {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  pointer-events: none;
}

#scalebar.hidden {
  display: none;
}

#scalebar-line {
  height: 3px;
  background: var(--text);
  border-left: 1px solid var(--text);
  border-right: 1px solid var(--text);
}

#scalebar-label {
  font-size: 11px;
  color: var(--text);
  background: rgba(20, 22, 26, 0.75);
  padding: 1px 6px;
  border-radius: 3px;
}

#settings-panel {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 280px;
  max-width: 85vw;
  background: var(--panel);
  border-left: 1px solid var(--border);
  box-shadow: -8px 0 24px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#settings-panel.hidden {
  display: none;
}

.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
}

#settings-close {
  background: transparent;
  border: none;
  color: var(--dim);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 6px;
}

#settings-close:hover {
  color: var(--text);
}

.settings-body {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
}

.settings-section {
  margin-bottom: 18px;
}

.settings-section h3 {
  margin: 0 0 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--dim);
  font-weight: 600;
}

.settings-section .opt-toggle,
.settings-section .opt-row {
  margin-bottom: 10px;
}