/* Bloch sphere and NMR: the sphere and the spin-½ box on top, the signal under them, the
   controls on the right.  Which plots and panels show depends on the view (data-view on main). */

:root {
  --mx: #2f62d8;          /* the mixer's x′ output, Mx′ */
  --my: #c8501a;          /* the mixer's y′ output, My′ */
  --mxy: #1d1d1f;         /* the envelope |Mxy|, the detector's output */
  --mz: #1f8a4a;          /* Mz, along B0 */
  --m: #d1243f;           /* the magnetization arrow */
  --trail: #e0607a;
  --b0: #7b3fb5;          /* the static field */
  --b1: #b0307a;          /* the RF field and the pulses */
  --beff: #8a5a00;        /* the effective field in the rotating frame */
  --raw: #3b4a6b;         /* the coil's EMF */
  --spec: #0f7a8a;        /* the spectrum */
  --fit: #b8860b;         /* fitted curves */
  --points: #1d1d1f;
  --cone: #d1243f;
  --sphere-hi: #ffffff;
  --sphere-lo: #e9ecf3;
  --coil: #b87333;        /* copper */
  --slow: #5b3fc0;        /* spins below the mean frequency … */
  --fast: #d07a00;        /* … and above it */
  --perp: #1d6fd1;        /* each spin's own part across the field, mean |M⊥ᵢ| */
}
@media (prefers-color-scheme: dark) {
  :root {
    --mx: #7aa2ff;
    --my: #ff9a5c;
    --mxy: #ececef;
    --mz: #6fd08f;
    --m: #ff5c74;
    --trail: #ff8fa0;
    --b0: #c79bff;
    --b1: #ff7ac0;
    --beff: #e8b84a;
    --raw: #a9b8d8;
    --spec: #4fd6d0;
    --fit: #f0c050;
    --points: #ececef;
    --cone: #ff5c74;
    --sphere-hi: #2a2c34;
    --sphere-lo: #16171c;
    --coil: #e0a060;
    --slow: #a08cff;
    --fast: #ffb347;
    --perp: #4f95f0;
  }
}

.nmr {
  display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 12px;
  padding: 10px 12px; max-width: 1560px; margin: 0 auto; align-items: start;
}
.stage { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.top-row { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; justify-content: space-between; }
.top-row .label { margin-right: 4px; }
.plot-wrap { position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.plot-wrap canvas { width: 100%; height: 100%; }

/* The sphere with the spin-½ box (or the board's sketch) beside it. */
.sphere-area { display: grid; grid-template-columns: minmax(0, 1fr) 270px; gap: 8px; }
.sphere-wrap { height: max(330px, calc(43vh - 10px)); }
#sphere { cursor: grab; }
#sphere.on-tip { cursor: pointer; }
#sphere.dragging { cursor: grabbing; }
.sphere-col { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.sphere-note {
  position: absolute; left: 8px; bottom: 5px; right: 8px; pointer-events: none;
  font-size: 12px; color: var(--ink-2); line-height: 1.35;
}
.sphere-note b { color: var(--ink); }
.side { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.side .panel { padding: 8px 10px; }

/* The spin-½ state. */
.spin-half { font-size: 13px; }
.spin-half .state { margin: 4px 0 6px; font-size: 14px; }
.spin-half .state math { font-size: 1.05em; }
.spin-half .amps { font-variant-numeric: tabular-nums; margin: 2px 0 4px; line-height: 1.5; }
.bars { display: grid; grid-template-columns: auto 1fr auto; gap: 3px 6px; align-items: center; font-size: 12px; color: var(--ink-2); }
.pbar { height: 9px; border-radius: 3px; background: var(--panel-2); border: 1px solid var(--line); overflow: hidden; }
.pbar > i { display: block; height: 100%; background: var(--m); }
.pbar.down > i { background: var(--b0); }
.spin-half .why { font-size: 12px; color: var(--ink-3); margin-top: 6px; }
/* It folds (on a phone it starts folded): the summary is its label. */
.spin-half > summary { cursor: pointer; }
.spin-half > summary .fold-note { display: none; text-transform: none; letter-spacing: 0; font-weight: 400; }
.spin-half:not([open]) > summary .fold-note { display: inline; }
.spin-half[open] > summary { margin-bottom: 2px; }

.readout { color: var(--ink-2); font-variant-numeric: tabular-nums; line-height: 1.5; min-height: 4.5em; }
.readout b, .readout .fixnum.b { color: var(--ink); font-weight: 600; }
.readout .warn { color: var(--warn); }

.signal-wrap { height: max(150px, calc(21vh - 10px)); }
.plots2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 8px; }
.raw-wrap, .spec-wrap, .zoom-wrap { height: max(130px, calc(16vh - 10px)); }
.timeline-wrap { height: 104px; }
#timeline { cursor: pointer; }

/* The plots take no drag, so a finger can scroll the page over them; the timeline's drags are
   sideways.  (The sphere keeps lib's touch-action: none: its tip is dragged every way.) */
#signal, #raw, #spec, #curve, #zoom, #board, #timeline, #clocks { touch-action: pan-y; }
/* In view 1 the coil's voltage comes first: it is what the spinning arrow makes. */
.nmr[data-view="one"] .plots2 { order: 1; }
.nmr[data-view="one"] .signal-wrap { order: 2; }

/* The three clocks (an experiment of view 2): their plot under the sphere, in place of the signal's. */
.nmr .clocks-wrap { display: none; height: max(270px, calc(31vh - 10px)); }
.nmr.clocks .clocks-wrap { display: block; }
.nmr.clocks .signal-wrap, .nmr.clocks .plots2 { display: none; }

/* Which pictures each view has. */
.nmr .plot-wrap.v-seq, .nmr .plot-wrap.v-earth, .nmr .spec-wrap, .nmr .curve-wrap, .nmr .zoom-wrap { display: none; }
.nmr[data-view="many"] .spec-wrap { display: block; }
.nmr[data-view="seq"] .v-seq, .nmr[data-view="seq"] .curve-wrap, .nmr[data-view="seq"] .spec-wrap { display: block; }
/* In views 3 and 4 the plot of what is measured stands beside the sphere, in place of the spin. */
.nmr[data-view="seq"] .sphere-area, .nmr[data-view="earth"] .sphere-area { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
.nmr[data-view="seq"] #spin-half, .nmr[data-view="earth"] #spin-half { display: none; }
.nmr[data-view="seq"] .sphere-wrap, .nmr[data-view="earth"] .sphere-wrap { height: max(270px, calc(36vh - 20px)); }
.nmr .side .curve-wrap { height: max(270px, calc(36vh - 20px)); }
.nmr[data-view="earth"] .v-earth, .nmr[data-view="earth"] .spec-wrap, .nmr[data-view="earth"] .zoom-wrap, .nmr[data-view="earth"] .curve-wrap { display: block; }
.board-wrap { height: 104px; }
/* View 4: the sphere, the tank's plot and the T₁ plot side by side. */
.nmr .tank-col { display: none; }
.nmr[data-view="earth"] .tank-col { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.nmr[data-view="earth"] .sphere-area { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.85fr); }
.nmr[data-view="earth"] .side { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 8px; align-items: start; }
.nmr .tank-wrap, .nmr[data-view="earth"] .sphere-wrap, .nmr[data-view="earth"] .side .curve-wrap { height: max(290px, calc(39vh - 20px)); }
#tank { cursor: ew-resize; touch-action: pan-y; }
#tank.dragging { cursor: grabbing; }
/* The DIP switches of the tank's bank: ON is up, as on the board. */
.dip { display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 3px; }
.dip button { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 3px 0 2px; font-size: 11px; line-height: 1.1; min-width: 0; }
.dip .knob { width: 12px; height: 22px; border-radius: 3px; border: 1px solid var(--line); background: var(--panel-2); position: relative; }
.dip .knob::after { content: ''; position: absolute; left: 1px; right: 1px; height: 9px; bottom: 1px; border-radius: 2px; background: var(--ink-3); }
.dip button[aria-pressed="true"] .knob::after { top: 1px; bottom: auto; background: var(--coil); }
.dip button[aria-pressed="true"] { border-color: var(--coil); }
.dip .n { font-weight: 600; }
.dip .c { color: var(--ink-3); font-size: 10px; }
.orient button { font-size: 13px; }
.nmr[data-view="one"] .plots2 { grid-template-columns: minmax(0, 1fr); }
.nmr[data-view="earth"] .raw-wrap { display: none; }
.nmr .hint.v-seq, .nmr .hint.v-earth { display: none; }
.nmr[data-view="seq"] .hint.v-seq, .nmr[data-view="earth"] .hint.v-earth { display: block; }

/* Controls; panels belong to views (data-views lists them). */
.controls { display: flex; flex-direction: column; gap: 8px; min-width: 0; }
.controls .panel { display: flex; flex-direction: column; gap: 6px; }
.controls .gloss { font-size: 12px; color: var(--ink-3); margin-top: -2px; }
.controls .note { font-size: 12px; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.pulse-buttons { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px; }
.pulse-buttons button { font-weight: 600; }
.check { display: flex; gap: 6px; align-items: center; cursor: pointer; color: var(--ink-2); }
.check input { margin: 0; accent-color: var(--accent); }
.slider.off input[type="range"] { opacity: 0.35; }
.slider.off input[type="number"] { color: var(--ink-3); }
.toggled-slider { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 6px; align-items: center; }
details summary { cursor: pointer; color: var(--ink-2); }
details[open] summary { margin-bottom: 6px; }
.button-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px; }
.button-grid button { padding: 3px 4px; font-size: 13px; }
#play { min-width: 5.4em; }
.seg button { font-size: 13px; }

@media (max-width: 900px) {
  .nmr { grid-template-columns: minmax(0, 1fr); padding: 8px; }
  .sphere-area, .nmr[data-view] .sphere-area { grid-template-columns: minmax(0, 1fr); }
  .nmr[data-view] .sphere-wrap { height: min(92vw, 380px); }
  .sphere-note .more { display: none; }
  .sphere-wrap { height: min(92vw, 380px); }
  .plots2 { grid-template-columns: minmax(0, 1fr); }
  .signal-wrap { height: 170px; }
  .nmr .clocks-wrap { height: 340px; }
  .raw-wrap, .spec-wrap, .zoom-wrap { height: 140px; }
  .nmr .side .curve-wrap { height: 220px; }
  .nmr[data-view="earth"] .side { grid-template-columns: minmax(0, 1fr); }
  .nmr .tank-wrap { height: 260px; }
  .nmr[data-view="earth"] .side .curve-wrap { height: 220px; }
}