:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --border: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-dim: #0ea5e9;
  --danger: #f87171;
  --warn: #fde047;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font: 14px/1.4 system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

#app {
  display: grid;
  grid-template-columns: 300px 1fr;
  height: 100vh;
}

#sidebar {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-head h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.home-link {
  text-decoration: none;
  font-size: 22px;
  line-height: 1;
}

.panel {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.hint {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 12px;
}

.file-btn, button {
  display: block;
  width: 100%;
  margin-bottom: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--accent-dim);
  color: #fff;
  font: inherit;
  cursor: pointer;
  text-align: center;
}

button:disabled, .file-btn:has(input:disabled) {
  opacity: 0.45;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  color: var(--text);
}

button.active-mode {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
  color: var(--accent);
}

label.secondary-file {
  background: transparent;
  color: var(--text);
}

.form-row {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}

.form-row input[type="text"] {
  flex: 1;
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0f172a;
  color: var(--text);
  font: inherit;
}

.form-row input[type="color"] {
  width: 42px;
  height: 38px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0f172a;
  cursor: pointer;
}

.track-title-row {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-bottom: 6px;
}

.track-title-row input {
  flex: 1;
  min-width: 0;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #0f172a;
  color: var(--text);
  font: inherit;
  font-weight: 600;
}

.track-select-btn {
  width: 32px;
  min-width: 32px;
  margin: 0;
  padding: 6px 0;
  font-size: 12px;
  font-weight: 700;
  background: #0f172a;
}

.track-select-btn.on {
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.track-block.selected-track {
  outline: 1px solid rgba(56, 189, 248, 0.55);
  outline-offset: 2px;
  border-radius: 8px;
  padding: 4px;
  background: rgba(56, 189, 248, 0.06);
}

.track-block.active-track:not(.selected-track) .track-title-row input {
  border-color: rgba(148, 163, 184, 0.55);
}

.waypoints-list {
  margin-top: 8px;
  max-height: 220px;
  overflow-y: auto;
}

.waypoints-list.empty {
  color: var(--muted);
  font-size: 13px;
}

.wp-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  padding: 8px;
  margin-bottom: 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0f172a;
}

.wp-item input[type="text"] {
  width: 100%;
  padding: 4px 6px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 12px;
}

.wp-item .wp-meta {
  grid-column: 1 / -1;
  font-size: 11px;
  color: var(--muted);
}

.wp-item .wp-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.wp-item .wp-actions button {
  margin: 0;
  padding: 4px 8px;
  font-size: 12px;
  width: auto;
}

.anim-link {
  display: block;
  margin-top: 4px;
  margin-bottom: 8px;
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
}

.anim-link:hover {
  text-decoration: underline;
}

button.seg-btn {
  text-align: left;
  background: #0f172a;
  margin-bottom: 4px;
}

button.seg-btn.active {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.track-block {
  margin-bottom: 12px;
}

.track-title {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 13px;
}

.segment-tree.empty {
  color: var(--muted);
  font-size: 13px;
}

.status {
  margin-top: auto;
  font-size: 12px;
  color: var(--muted);
  min-height: 48px;
}

#map-wrap {
  position: relative;
  min-width: 0;
}

#shift-box {
  position: absolute;
  border: 2px dashed #fde047;
  background: rgba(253, 224, 71, 0.12);
  pointer-events: none;
  z-index: 5;
  display: none;
}

#map {
  position: absolute;
  inset: 0;
}

#ctx-menu {
  position: fixed;
  z-index: 1000;
  min-width: 220px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px 0;
  box-shadow: 0 8px 32px rgba(0,0,0,0.45);
}

#ctx-menu button {
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  text-align: left;
  padding: 8px 14px;
}

#ctx-menu button:hover:not(:disabled) {
  background: #334155;
}

#ctx-menu button:disabled {
  opacity: 0.4;
}

.maplibregl-ctrl-attrib {
  font-size: 10px;
}

@media (max-width: 800px) {
  #app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; }
  #sidebar { max-height: 40vh; }
}