/* =============================================================================
   Synapse — fNIRS Lab page styles (loaded with site.css). Self-contained.
   ========================================================================== */
.fn-head { margin-bottom: 18px; }
.fn-head h1 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); letter-spacing: -.02em; }
.fn-head p { color: var(--muted); max-width: 78ch; margin-top: 8px; }

.fn-state-desc {
  margin: 0 0 16px; padding: 11px 15px; border: 1px solid var(--border);
  border-left: 3px solid var(--cyan); border-radius: 10px; background: var(--surface);
  color: var(--text); font-size: .9rem; line-height: 1.5; max-width: 96ch;
}

.fn-stage { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 16px; align-items: start; }
@media (max-width: 900px) { .fn-stage { grid-template-columns: 1fr; } }

.fn-viewer {
  position: relative; border: 1px solid var(--border); border-radius: var(--radius);
  background: #0c1430; overflow: hidden; box-shadow: 0 1px 2px rgba(28, 48, 118, .05);
}
#fn-chart { display: block; width: 100%; height: 420px; }
@media (max-width: 900px) { #fn-chart { height: 330px; } }
.fn-readout { position: absolute; right: 14px; top: 12px; z-index: 3; font-size: .82rem; color: #aeb9da;
  background: rgba(12,20,48,.72); padding: 3px 11px; border-radius: 999px; font-variant-numeric: tabular-nums; }

.fn-side { display: flex; flex-direction: column; gap: 14px; }
.fn-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 15px 16px; }
.fn-card h4 { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; color: var(--faint); margin: 0 0 10px; }
#fn-map { display: block; width: 100%; max-width: 250px; margin: 0 auto; aspect-ratio: 1/1; height: auto; }
.fn-map-cap { font-size: .72rem; color: var(--faint); text-align: center; margin: 8px 0 0; }
.fn-read { font-size: .85rem; color: var(--muted); line-height: 1.5; }
.fn-read b { color: var(--text); }

.fn-legend { display: flex; gap: 14px; justify-content: center; font-size: .78rem; font-weight: 600; color: var(--muted); }
.fn-legend span { display: inline-flex; align-items: center; gap: 6px; }
.fn-legend i { width: 16px; height: 4px; border-radius: 2px; display: inline-block; }

/* controls */
.fn-controls {
  margin-top: 16px; display: flex; flex-wrap: wrap; gap: 22px 30px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px;
}
.fn-controls .grp { min-width: 140px; }
.grp-title { font-size: .7rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; color: var(--faint); margin-bottom: 10px; }
.fn-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }

.ctl {
  display: inline-flex; align-items: center; justify-content: center; text-align: center;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--muted);
  font-size: .85rem; font-weight: 600; padding: 9px 13px; border-radius: 10px; cursor: pointer;
  transition: .15s; -webkit-tap-highlight-color: transparent; user-select: none;
}
.ctl:hover { border-color: var(--border-2); color: var(--text); background: var(--surface-3); }
.ctl.active { background: var(--grad); color: #fff; border-color: transparent; box-shadow: 0 6px 16px -8px rgba(34, 211, 238, .5); }
.ctl:active { transform: scale(.97); }
.fn-slider { display: flex; align-items: center; gap: 8px; font-size: .82rem; color: var(--muted); font-weight: 600; }
.fn-slider input[type=range] { accent-color: var(--cyan); width: 150px; }

.fn-note { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--border); font-size: .82rem; color: var(--faint); line-height: 1.6; }
.fn-note a { color: var(--cyan); }