:root {
  --bg: #1a1a2e;
  --panel: #16213e;
  --panel-border: #0f3460;
  --accent: #e94560;
  --accent2: #4dd0e1;
  --text: #ffffff;
  --text-dim: #8899aa;
  --text-faint: #5b6b82;
  --trace: #4dd0e1;
  --trace-alt: #7ee787;
}

* { box-sizing: border-box; }

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

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--panel-border);
  flex-shrink: 0;
}

.brand { font-size: 18px; font-weight: 700; color: var(--accent); }
.brand-sub { color: var(--text-dim); font-weight: 500; font-size: 13px; margin-left: 6px; }

.topbar-actions { display: flex; gap: 8px; }

.btn {
  background: var(--panel-border);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s;
}
.btn:hover { background: #1a3a6e; }
.btn-ghost { background: transparent; border: 1px solid var(--panel-border); color: var(--text-dim); }
.btn-ghost:hover { background: var(--panel-border); color: var(--text); }
.btn-icon { font-size: 16px; padding: 8px 10px; }
.btn-accent { background: var(--accent); border-color: var(--accent); }
.btn-accent:hover { background: #ff5570; }
.btn-block { width: 100%; margin-bottom: 8px; text-align: center; }
.btn-small { font-size: 11px; padding: 5px 10px; white-space: nowrap; }

.main {
  display: flex;
  flex: 1;
  min-height: 0;
}

.controls {
  width: 300px;
  flex-shrink: 0;
  background: var(--panel);
  border-right: 1px solid var(--panel-border);
  overflow-y: auto;
  padding: 14px;
  transition: margin-left 0.2s;
}
.controls.hidden-panel { margin-left: -300px; }

.panel {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 12px;
}
.panel h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  margin: 0 0 10px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.panel h3 .val { color: var(--accent2); font-weight: 700; }

.select, .select-inline {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 8px;
  font-size: 13px;
}
.select-inline { width: auto; padding: 3px 6px; font-size: 11px; margin: 0 4px; }

.segmented {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  overflow-x: auto;
}
.segmented.wrap { flex-wrap: wrap; }
.segmented button {
  flex: 1 0 auto;
  background: var(--bg);
  color: var(--text-dim);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 7px 8px;
  font-size: 11.5px;
  cursor: pointer;
  white-space: nowrap;
}
.segmented button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

.row-check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--text-dim);
  margin-top: 8px;
  cursor: pointer;
}

.slider {
  width: 100%;
  accent-color: var(--accent);
}

.collapse-toggle { cursor: pointer; user-select: none; }
.chev { transition: transform 0.15s; color: var(--text-faint); }
.panel.collapsed .chev { transform: rotate(-90deg); }
.panel.collapsed .collapse-body { display: none; }

.artifact-row, .ench-row {
  margin-bottom: 10px;
}
.artifact-row .row-top, .ench-row .row-top {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 4px;
}
.artifact-row .row-top .pct, .ench-row .row-top .pct { color: var(--accent2); font-weight: 600; }
.artifact-row input[type=range], .ench-row input[type=range] {
  width: 100%;
  accent-color: var(--accent2);
}
.focus-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-faint);
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 4px;
  cursor: pointer;
  margin-left: 6px;
}
.focus-btn:hover { color: var(--accent2); border-color: var(--accent2); }
.focus-btn.active { color: #fff; background: var(--accent2); border-color: var(--accent2); }

.lr-toggle {
  display: inline-flex;
  gap: 4px;
  margin-left: 6px;
}
.lr-toggle button {
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid var(--panel-border);
  background: var(--bg);
  color: var(--text-faint);
  cursor: pointer;
}
.lr-toggle button.active { background: var(--accent2); color: #06202b; border-color: var(--accent2); font-weight: 700; }

.event-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.event-row label { flex: 1; min-width: 180px; }
.hint { color: var(--text-faint); font-size: 11px; }
.numsec {
  width: 48px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 5px;
  padding: 3px 4px;
  font-size: 11.5px;
}
.event-status {
  font-size: 11.5px;
  color: var(--accent2);
  min-height: 16px;
}

.stage {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
  background: #0a0a1a;
}

.head-map-wrap {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 150px;
  z-index: 5;
  background: rgba(22,33,62,0.85);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 8px;
  backdrop-filter: blur(4px);
}
.head-map { width: 100%; height: auto; display: block; }
.head-map-hint { font-size: 9.5px; color: var(--text-faint); text-align: center; margin-top: 4px; }

.lead-dot {
  fill: #16213e;
  stroke: var(--accent2);
  stroke-width: 1.5;
  cursor: pointer;
}
.lead-dot:hover { fill: var(--accent2); }
.lead-dot.focused { fill: var(--accent); stroke: var(--accent); }
.lead-label {
  fill: var(--text-dim);
  font-size: 7px;
  text-anchor: middle;
  pointer-events: none;
}

.trace-wrap {
  flex: 1;
  display: flex;
  min-height: 0;
  padding: 8px 12px 0 12px;
}

.labels {
  display: flex;
  flex-direction: column;
  width: 64px;
  flex-shrink: 0;
  border-right: 1px solid var(--panel-border);
}
.label-row {
  display: flex;
  align-items: center;
  font-size: 10.5px;
  color: var(--text-dim);
  font-weight: 600;
  padding-left: 4px;
  border-bottom: 1px solid rgba(15,52,96,0.4);
}
.label-row.focused { color: var(--accent); }

#traceCanvas {
  flex: 1;
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

.calibration {
  padding: 6px 12px 10px 76px;
  font-size: 11px;
  color: var(--text-faint);
  flex-shrink: 0;
}

.overlay-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--panel);
  border-top: 2px solid var(--accent);
  box-shadow: 0 -10px 30px rgba(0,0,0,0.5);
  z-index: 50;
  max-height: 46vh;
  display: flex;
  flex-direction: column;
}
.overlay-panel.hidden { display: none; }
.overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--panel-border);
}
.overlay-header h2 { margin: 0; font-size: 16px; color: var(--accent); }
.overlay-body { padding: 14px 18px; overflow-y: auto; flex: 1; }
.overlay-prompt { font-size: 14px; color: var(--text); line-height: 1.5; }
.overlay-footer {
  display: flex;
  gap: 10px;
  padding: 12px 18px;
  border-top: 1px solid var(--panel-border);
}
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
}
.quiz-option {
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--panel-border);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  font-size: 13px;
}
.quiz-option:hover { border-color: var(--accent2); }
.quiz-option.selected { border-color: var(--accent2); background: #12333a; }
.quiz-option.correct { border-color: #4CAF50; background: #123312; }
.quiz-option.incorrect { border-color: var(--accent); background: #331218; }
.quiz-feedback { margin-top: 10px; font-weight: 600; font-size: 13.5px; min-height: 20px; }

#tutTitle { color: var(--accent2); margin: 0 0 8px 0; font-size: 15px; }

@media (max-width: 860px) {
  .controls { position: fixed; top: 0; bottom: 0; left: 0; z-index: 40; height: 100%; }
  .head-map-wrap { width: 110px; }
}