/* ============================================================
   ReLU.chat — Diagram CSS
   Responsive styling for the safe SVG diagram renderer.
   Track C P1 from the optimization report.
   ============================================================ */

/* ----- Container ----- */
.relu-diagram {
  max-width: 100%;
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border, #1f2937);
  border-radius: var(--radius, 6px);
  background: var(--bg-elevated, #151b23);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.75rem;
  box-sizing: border-box;
}

.relu-diagram-svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ----- Caption ----- */
.relu-diagram .caption {
  color: var(--text-muted, #6b7280);
  font-size: 0.8125rem;
  font-style: italic;
  margin-top: 0.5rem;
  text-align: center;
  padding: 0 1rem;
}

/* ----- Text fallback ----- */
.relu-diagram .text-fallback {
  display: none;
  font-family: monospace, 'Courier New', Courier;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-secondary, #9ca3af);
  padding: 1rem;
  background: var(--bg-surface, #1f2937);
  border-radius: var(--radius, 6px);
  white-space: pre-wrap;
  overflow-x: auto;
  width: 100%;
  box-sizing: border-box;
}

/* ----- Table (for textual matrix fallback) ----- */
.relu-diagram table {
  border-collapse: collapse;
  width: 100%;
  max-width: 100%;
  font-size: 0.8125rem;
}

.relu-diagram table th,
.relu-diagram table td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border, #1f2937);
  text-align: center;
  color: var(--text-primary, #f9fafb);
}

.relu-diagram table th {
  background: var(--bg-surface, #1f2937);
  font-weight: 600;
  color: var(--text-secondary, #9ca3af);
}

.relu-diagram table .highlight {
  border: 2px solid var(--accent, #14b8a6);
  background: var(--bg-surface, #1f2937);
  font-weight: 600;
}

/* ----- Highlight styling (payoff matrices) ----- */
.relu-diagram .highlight {
  border-color: var(--accent, #14b8a6) !important;
  background: var(--bg-surface, #1f2937) !important;
}

/* ----- SVG text label classes ----- */
.relu-diagram-cell-label {
  text-anchor: middle;
  fill: var(--text-muted, #6b7280);
  font-size: 11px;
}

.relu-diagram-edge-label {
  text-anchor: middle;
  fill: var(--text-muted, #6b7280);
  font-size: 11px;
}

/* ----- Mobile / small screen ----- */
.relu-diagram.mobile {
  padding: 0.5rem;
  border-radius: 8px;
}

.relu-diagram.mobile .text-fallback {
  display: block;
}

.relu-diagram.mobile .relu-diagram-svg {
  display: none;
}

.relu-diagram.mobile .caption {
  font-size: 0.75rem;
  padding: 0 0.5rem;
}

@media (max-width: 400px) {
  .relu-diagram {
    padding: 0.5rem;
    border-radius: 8px;
  }

  .relu-diagram .text-fallback {
    display: block;
  }

  .relu-diagram-svg {
    display: none;
  }

  .relu-diagram .caption {
    font-size: 0.75rem;
    padding: 0 0.5rem;
  }
}

/* Expandable on mobile */
.relu-diagram[data-expandable="true"] {
  cursor: pointer;
}

.relu-diagram[data-expandable="true"]:active {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  overflow: auto;
  background: var(--bg, #0d1117);
  border: none;
  border-radius: 0;
  padding: 2rem;
}