:root {
  --bg: #0d0d14;
  --surface: #13131d;
  --surface-2: #1a1a2e;
  --paper-white: #fafaf5;
  --paper-edge: #2a2a3a;
  --mountain: #f59e0b;
  --valley: #38bdf8;
  --target-ghost: rgba(124, 58, 237, 0.20);
  --target-ghost-stroke: rgba(124, 58, 237, 0.45);
  --validity: #22d3ee;
  --progress: #22c55e;
  --economy: #a78bfa;
  --text-primary: #f8fafc;
  --text-dim: #64748b;
  --border: #2a2a3a;
  --border-bright: #3a3a5a;
  --font-display: 'JetBrains Mono', monospace;
  --font-mono: 'IBM Plex Mono', monospace;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--bg);
  overflow: hidden;
}

/* ─── HEADER ─── */
.app-header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 0 20px;
  height: 48px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
  z-index: 10;
}

.app-title {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  white-space: nowrap;
}

.app-title .title-accent {
  color: var(--mountain);
}

.header-sep {
  width: 1px;
  height: 24px;
  background: var(--border);
  flex-shrink: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

.api-status {
  font-size: 11px;
  font-family: var(--font-display);
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 6px;
}

.api-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-dim);
}

.api-status-dot.ok {
  background: var(--progress);
  box-shadow: 0 0 6px var(--progress);
}

.api-status-dot.err {
  background: #ef4444;
  box-shadow: 0 0 6px #ef4444;
}

/* ─── MAIN LAYOUT ─── */
.app-body {
  display: grid;
  grid-template-columns: 1fr 280px;
  flex: 1;
  overflow: hidden;
}

.app-left {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border);
}

.app-right {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--surface);
}

/* ─── CANVAS ROW ─── */
.canvas-row {
  display: flex;
  gap: 0;
  padding: 16px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.canvas-wrap {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-width: 280px;
}

.canvas-wrap + .canvas-wrap {
  margin-left: 16px;
}

.canvas-label {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.canvas-svg {
  display: block;
  background: var(--paper-white);
}

.canvas-3d {
  display: block;
  background: linear-gradient(180deg, #1a1a2e 0%, #0f101a 100%);
  border: 1px solid var(--border);
}

.canvas-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.fold-mode-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  background: var(--surface);
}

.fold-mode-btn {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 9px;
  letter-spacing: 0.08em;
  padding: 3px 7px;
  cursor: pointer;
}

.fold-mode-btn + .fold-mode-btn {
  border-left: 1px solid var(--border);
}

.fold-mode-btn.active {
  color: var(--text-primary);
  background: #1f2538;
}

/* ─── STEP FEED ─── */
.step-feed-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.section-header {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  text-transform: uppercase;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.step-feed {
  overflow-y: auto;
  flex: 1;
  padding: 4px 0;
}

.step-entry {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  cursor: default;
  transition: background 0.1s;
}

.step-entry:hover {
  background: var(--surface);
}

.step-entry.active {
  background: var(--surface-2);
  border-left: 2px solid var(--valley);
  padding-left: 14px;
}

.step-entry-top {
  display: flex;
  align-items: center;
  gap: 8px;
}

.step-num {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  color: var(--text-dim);
  width: 24px;
  flex-shrink: 0;
}

.step-instruction {
  font-size: 12px;
  color: var(--text-primary);
  flex: 1;
}

.assign-badge {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  padding: 1px 5px;
  line-height: 1.4;
  flex-shrink: 0;
}

.assign-badge.M {
  background: var(--mountain);
  color: #0d0d14;
}

.assign-badge.V {
  background: var(--valley);
  color: #0d0d14;
}

.assign-badge.B {
  background: var(--border-bright);
  color: var(--text-dim);
}

.step-reward-delta {
  font-size: 11px;
  color: var(--text-dim);
  padding-left: 32px;
}

.step-reward-delta .delta-positive {
  color: var(--progress);
}

.step-reward-delta .delta-negative {
  color: #ef4444;
}

/* ─── REWARD PANEL ─── */
.reward-panel {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.reward-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.reward-row:last-child {
  margin-bottom: 0;
}

.reward-label {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  width: 72px;
  flex-shrink: 0;
  text-transform: uppercase;
}

.reward-track {
  flex: 1;
  height: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
}

.reward-bar {
  height: 100%;
  transition: width 0.4s ease;
}

.reward-value {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-primary);
  width: 36px;
  text-align: right;
  flex-shrink: 0;
}

.reward-value.dim {
  color: var(--text-dim);
}

.reward-divider {
  height: 1px;
  background: var(--border);
  margin: 6px 0;
}

/* ─── INFO BADGES ─── */
.info-badges {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.info-key {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.info-val {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  color: var(--text-primary);
}

.info-val.bool-true {
  color: var(--progress);
}

.info-val.bool-false {
  color: #ef4444;
}

.info-val.dim {
  color: var(--text-dim);
}

/* ─── TARGET SELECTOR ─── */
.target-selector {
  display: flex;
  align-items: center;
  gap: 8px;
}

.target-selector-label {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.10em;
  color: var(--text-dim);
  text-transform: uppercase;
  white-space: nowrap;
}

.target-select {
  background: var(--surface-2);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 11px;
  padding: 4px 8px;
  outline: none;
  cursor: pointer;
  min-width: 180px;
}

.target-select:focus {
  border-color: var(--valley);
}

optgroup {
  background: var(--surface);
  color: var(--text-dim);
  font-family: var(--font-display);
  font-size: 10px;
}

option {
  background: var(--surface-2);
  color: var(--text-primary);
  font-family: var(--font-display);
}

/* ─── PLAYER CONTROLS ─── */
.player-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.ctrl-btn {
  background: var(--surface-2);
  border: 1px solid var(--border-bright);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  cursor: pointer;
  white-space: nowrap;
  line-height: 1.4;
  letter-spacing: 0.04em;
  transition: background 0.1s, border-color 0.1s;
}

.ctrl-btn:hover:not(:disabled) {
  background: var(--surface);
  border-color: var(--text-dim);
}

.ctrl-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.ctrl-btn.play {
  border-color: var(--valley);
  color: var(--valley);
}

.ctrl-btn.play:hover:not(:disabled) {
  background: rgba(56, 189, 248, 0.1);
}

.ctrl-step-display {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
  padding: 4px 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  white-space: nowrap;
  min-width: 72px;
  text-align: center;
}

/* ─── LOADING / ERROR ─── */
.app-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  z-index: 100;
}

.overlay-message {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 12px;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--valley);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.2; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1); }
}

/* ─── MISC ─── */
.episode-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}