/* Researchium — KaTeX math (readable, responsive, accessible) */

:root {
  --math-text: #1a1a2e;
  --math-muted: #374151;
  --math-min-font: 1rem;
}

.math-content,
.gate-q-body,
.mcq-q,
.mcq-option,
.gate-options label {
  font-size: clamp(var(--math-min-font), 2.8vw, 1.1rem);
  line-height: 1.7;
  color: var(--math-text);
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

/* Reserve space while KaTeX loads — reduces layout shift */
.math-typesetting {
  min-height: 2.75em;
}

.math-content .katex,
.gate-q-body .katex,
.mcq-q .katex,
.mcq-option .katex,
.gate-options .katex {
  font-size: 1.1em;
  color: var(--math-text) !important;
}

/* High contrast for symbols */
.katex .mord,
.katex .mbin,
.katex .mrel,
.katex .mop,
.katex .mopen,
.katex .mclose,
.katex .mpunct,
.katex .minner {
  color: var(--math-text);
}

/* Display math — matrices, integrals, multi-line */
.math-content .katex-display,
.gate-q-body .katex-display,
.mcq-q .katex-display {
  margin: 0.75em 0;
  padding: 0.35rem 0;
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

/* Inline math in options — allow horizontal scroll on narrow screens */
.gate-options label,
.mcq-option {
  overflow-x: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

.gate-q-body,
.mcq-q {
  margin: 0.75rem 0 1rem;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.gate-options label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0.55rem 0;
  padding: 0.4rem 0.25rem;
  cursor: pointer;
}

.gate-options label input[type="radio"] {
  flex-shrink: 0;
  margin-top: 0.35rem;
}

.gate-options .gate-opt-text {
  flex: 1;
  min-width: 0;
}

.mcq-card {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #e5e7eb;
}

.mcq-q {
  margin-bottom: 0.85rem;
}

.mcq-option {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 0.45rem 0;
  padding: 0.3rem 0.15rem;
  cursor: pointer;
}

.mcq-option input {
  flex-shrink: 0;
  margin-top: 0.3rem;
}

.mcq-option .mcq-opt-text {
  flex: 1;
  min-width: 0;
}

/* KaTeX matrix / array — prevent clipping */
.katex .array,
.katex .matrix,
.katex .cases {
  font-size: 1em;
}

/* Fallback when CDN fails — still readable */
.math-fallback .math-latex-fallback {
  display: block !important;
  font-family: "Courier New", Courier, monospace;
  font-size: 0.95rem;
  color: var(--math-muted);
  white-space: pre-wrap;
  margin-top: 0.35rem;
  padding: 0.5rem;
  background: #f8fafc;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}

.math-fallback .math-latex-fallback[hidden] {
  display: block !important;
}

/* Screen-reader-only raw LaTeX (when KaTeX succeeds, MathML is primary) */
.sr-only-math-source {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 640px) {
  :root {
    --math-min-font: 1.02rem;
  }

  .math-content .katex,
  .gate-q-body .katex,
  .mcq-q .katex,
  .mcq-option .katex {
    font-size: 1.05em;
  }

  .katex-display {
    font-size: 1em;
  }

  .gate-options label,
  .mcq-option {
    padding: 0.5rem 0.2rem;
  }
}

@media (prefers-contrast: more) {
  :root {
    --math-text: #000;
  }

  .katex .mord,
  .katex .mbin,
  .katex .mrel {
    color: #000 !important;
  }
}

@media (prefers-reduced-motion: reduce) {
  .math-typesetting {
    min-height: 0;
  }
}