/* Styles for the Chapter 6 radiation explorer and the boundary value problem
   anatomy. The .sdof-* base classes are kept identical to the other chapters'
   simulators so the whole book's tools look like one family. */

.sdof-app {
  margin: 1.5rem 0;
  border: 1px solid var(--bs-border-color, #ccc);
  border-radius: 0.5rem;
  padding: 1rem;
  background: var(--bs-body-bg, #fff);
}

.sdof-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem 1.25rem;
  align-items: end;
  margin-bottom: 0.75rem;
}

.sdof-control-group {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
}

.sdof-control-group label { margin-bottom: 0.25rem; }
.sdof-control-group input[type="range"] { width: 100%; }

.sdof-control-group select {
  width: 100%;
  padding: 0.25rem 0.3rem;
  border-radius: 0.3rem;
  border: 1px solid var(--bs-border-color, #ccc);
  background: var(--bs-body-bg, #fff);
  color: var(--bs-body-color, #222);
  font-size: 0.9rem;
}

.sdof-buttons {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.sdof-buttons button {
  padding: 0.4rem 0.9rem;
  border-radius: 0.35rem;
  border: 1px solid var(--bs-border-color, #ccc);
  background: var(--bs-tertiary-bg, #f0f0f0);
  color: var(--bs-body-color, #222);
  cursor: pointer;
  font-size: 0.9rem;
}

.sdof-buttons button:hover { filter: brightness(0.95); }

.sdof-buttons button.rad-active,
.sdof-buttons button.bvp-active {
  background: #2c5282;
  border-color: #2c5282;
  color: #fff;
}

/* ---------------- radiation explorer ---------------- */

.rad-status {
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 0.8rem;
  padding: 0.55rem 0.75rem;
  border-left: 4px solid #2c5282;
  border-radius: 0.25rem;
  background: var(--bs-tertiary-bg, #f1f3f5);
  color: var(--bs-body-color, #333);
}

.rad-note {
  font-size: 0.85rem;
  color: var(--bs-secondary-color, #666);
  margin: -0.35rem 0 0.75rem;
}

.rad-wave-wrap canvas {
  width: 100%;
  height: 240px;
  background: #eef3f7;
  border: 1px solid var(--bs-border-color, #ccc);
  border-radius: 0.4rem;
  display: block;
  margin-bottom: 0.9rem;
}

.rad-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 0.9rem;
}

@media (max-width: 1100px) {
  .rad-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .rad-grid { grid-template-columns: 1fr; }
}

.rad-panel canvas {
  width: 100%;
  height: 250px;
  background: #fff;
  border: 1px solid var(--bs-border-color, #ccc);
  border-radius: 0.4rem;
  display: block;
  touch-action: none;
}

.rad-panel-title {
  margin-top: 0.35rem;
  font-size: 0.85rem;
  text-align: center;
  color: var(--bs-body-color, #333);
}

.rad-readouts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.55rem 1rem;
  font-size: 0.87rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--bs-border-color, #ccc);
  border-radius: 0.4rem;
}

.rad-readouts .rad-cell {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  border-bottom: 1px dotted var(--bs-border-color, #ddd);
  padding-bottom: 0.2rem;
}

.rad-readouts .rad-val {
  font-family: var(--bs-font-monospace, monospace);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.rad-legend {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.6rem;
}

.rad-chip {
  font-size: 0.83rem;
  padding: 0.2rem 0.6rem;
  border-radius: 0.35rem;
  border-left: 6px solid transparent;
  background: var(--bs-tertiary-bg, #f1f3f5);
}

.rad-chip-a  { border-left-color: #2c5282; }
.rad-chip-b  { border-left-color: #c53030; }
.rad-chip-n  { border-left-color: #805ad5; }

/* ---------------- boundary value problem anatomy ---------------- */

.bvp-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.85fr) minmax(340px, 1.25fr);
  gap: 1rem;
  align-items: start;
}

/* The diagram is short and the detail column is long; keep the figure in view
   as the reader works down the conditions. */
@media (min-width: 901px) {
  .bvp-figure { position: sticky; top: 1rem; }
}

@media (max-width: 900px) {
  .bvp-layout { grid-template-columns: 1fr; }
}

.bvp-figure {
  border: 1px solid var(--bs-border-color, #ccc);
  border-radius: 0.4rem;
  background: #f7fafc;
  padding: 0.4rem;
}

.bvp-figure svg { width: 100%; height: auto; display: block; }

/* Region highlighting: everything dims a little, the picked one lifts. */
.bvp-region { transition: opacity 0.18s ease, filter 0.18s ease; opacity: 0.55; }
.bvp-region.bvp-on { opacity: 1; filter: saturate(1.25); }
.bvp-region:hover { opacity: 0.85; }

.bvp-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
}

.bvp-tab {
  font-size: 0.85rem;
  padding: 0.28rem 0.7rem;
  border-radius: 0.35rem;
  border: 1px solid var(--bs-border-color, #ccc);
  border-left-width: 6px;
  background: var(--bs-tertiary-bg, #f1f3f5);
  color: var(--bs-body-color, #222);
  cursor: pointer;
}

.bvp-tab:hover { filter: brightness(0.96); }

.bvp-tab.bvp-active {
  background: var(--bs-body-bg, #fff);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(0,0,0,0.10);
}

.bvp-tab-domain { border-left-color: #4a5568; }
.bvp-tab-sf     { border-left-color: #2b6cb0; }
.bvp-tab-sb     { border-left-color: #805ad5; }
.bvp-tab-sz     { border-left-color: #b7791f; }
.bvp-tab-sinf   { border-left-color: #2f855a; }

.bvp-detail-head {
  border-left: 5px solid #2b6cb0;
  padding: 0.15rem 0 0.15rem 0.7rem;
  margin-bottom: 0.7rem;
}

.bvp-detail-name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.bvp-detail-what {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--bs-body-color, #333);
}

.bvp-eq-row {
  margin: 0.5rem 0;
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--bs-border-color, #e2e8f0);
  border-radius: 0.35rem;
  background: var(--bs-body-bg, #fff);
  overflow-x: auto;
}

.bvp-eq-tag {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--bs-secondary-color, #718096);
  font-weight: 600;
  margin-bottom: 0.1rem;
}

.bvp-eq-body { font-size: 0.94rem; }

/* Quarto gives display math a lot of vertical margin; tighten it in the box. */
.bvp-eq-body mjx-container { margin: 0.15rem 0 !important; }

.bvp-notes {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
  margin-top: 0.8rem;
}

.bvp-note {
  font-size: 0.87rem;
  line-height: 1.5;
  padding: 0.5rem 0.7rem;
  border-radius: 0.35rem;
  background: var(--bs-tertiary-bg, #f1f3f5);
}

.bvp-note-title {
  font-weight: 600;
  margin-bottom: 0.18rem;
  color: #2c5282;
}

.bvp-drop {
  background: #fed7d7;
  color: #9b2c2c;
  padding: 0 0.22rem;
  border-radius: 0.2rem;
  font-family: var(--bs-font-monospace, monospace);
  font-size: 0.9em;
}