/* ============ Ray Optics — instrument-specific styles ============ */

/* Type palette */
.palette {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  margin: 4px 0 2px;
  background: linear-gradient(160deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  flex-wrap: wrap;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.pal-btn {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--mut);
  background: transparent;
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 8px;
  padding: 5px 11px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.pal-btn:hover { color: var(--txt); border-color: var(--line-strong); background: rgba(255,255,255,0.05); transform: translateY(-1px); }
.pal-btn:active { transform: translateY(0) scale(0.97); }
.pal-btn.active {
  color: var(--acc);
  border-color: rgba(103,232,249,0.4);
  background: rgba(103,232,249,0.1);
  box-shadow: 0 0 12px -2px rgba(103,232,249,0.15);
}
.pal-sep {
  width: 1px; height: 20px;
  background: rgba(255,255,255,0.08);
  margin: 0 3px;
  flex-shrink: 0;
}

/* SVG canvas */
#optSvg { cursor: default; }
#optSvg .draggable { cursor: ew-resize; }

/* Principal axis */
.axis-line {
  stroke: rgba(255,255,255,0.1);
  stroke-width: 1;
  stroke-dasharray: 8 6;
}

/* Optical element */
.lens-body {
  stroke: rgba(130,195,250,0.75);
  stroke-width: 1.8;
  fill: url(#lensG);
  filter: drop-shadow(0 0 6px rgba(130,195,250,0.15));
}
.lens-edge {
  stroke: rgba(130,195,250,0.55);
  stroke-width: 1.4;
  stroke-linecap: round;
  fill: none;
}
.mirror-arc {
  stroke: rgba(195,210,235,0.85);
  stroke-width: 2.2;
  fill: none;
  stroke-linecap: round;
  filter: drop-shadow(0 0 4px rgba(195,210,235,0.15));
}
.mirror-hatch {
  stroke: rgba(195,210,235,0.2);
  stroke-width: 1;
}

/* Object arrow */
.obj-arrow {
  stroke: #fbbf24;
  stroke-width: 3;
  stroke-linecap: round;
  fill: none;
  filter: drop-shadow(0 0 5px rgba(251,191,36,0.3));
}
.obj-head {
  fill: #fbbf24;
  filter: drop-shadow(0 0 3px rgba(251,191,36,0.4));
}
.obj-base {
  fill: #fbbf24;
  stroke: none;
}

/* Image arrow */
.img-arrow {
  stroke: #a78bfa;
  stroke-width: 2.5;
  stroke-linecap: round;
  fill: none;
  filter: drop-shadow(0 0 4px rgba(167,139,250,0.3));
}
.img-arrow-virtual {
  stroke-dasharray: 6 4;
}
.img-head {
  fill: #a78bfa;
}

/* Rays */
.ray {
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
}
.ray-solid { stroke-dasharray: none; }
.ray-dashed {
  stroke-dasharray: 6 5;
  opacity: 0.4;
}
.ray-1 { stroke: #ef4444; filter: drop-shadow(0 0 3px rgba(239,68,68,0.25)); }
.ray-2 { stroke: #22c55e; filter: drop-shadow(0 0 3px rgba(34,197,94,0.25)); }
.ray-3 { stroke: #3b82f6; filter: drop-shadow(0 0 3px rgba(59,130,246,0.25)); }

/* Markers */
.mark-dot {
  fill: rgba(255,255,255,0.4);
  stroke: rgba(255,255,255,0.1);
  stroke-width: 1;
}
.mark-label {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: rgba(255,255,255,0.4);
  text-anchor: middle;
  font-weight: 500;
}
.dist-label {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: rgba(255,255,255,0.3);
  text-anchor: middle;
}

/* Nature badge in readings */
.nature-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 6px;
  margin-top: 6px;
}
.nature-real { color: #34d399; background: rgba(52,211,153,0.12); border: 1px solid rgba(52,211,153,0.25); }
.nature-virtual { color: #a78bfa; background: rgba(167,139,250,0.12); border: 1px solid rgba(167,139,250,0.25); }

/* Panel separator */
.panel-sep {
  border: none;
  border-top: 1px solid rgba(255,255,255,0.06);
  margin: 0.75rem 0;
}

kbd {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 4px;
  padding: 1px 5px;
}