/* Binary Validation article — inherits vars + .btn from /shared/style.css */

/* ── Article prose ── */
.article {
  max-width: 740px;
  margin: 0 auto;
  padding: 2rem 1.5rem 1rem;
  line-height: 1.75;
}
.article h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
  line-height: 1.25;
}
.article .subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
  font-family: var(--sans);
}
.article h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2.5rem 0 0.75rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
}
.article h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
}
.article p {
  margin: 0.75rem 0;
}
.article ul, .article ol {
  margin: 0.75rem 0;
  padding-left: 1.5rem;
}
.article li {
  margin: 0.3rem 0;
}
.article code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--bg-alt, var(--panel));
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

/* ── Math blocks ── */
.math-block {
  overflow-x: auto;
  margin: 1rem 0;
  text-align: center;
}

/* ── Confusion matrix table ── */
.cm-table {
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.85rem;
  margin: 1rem auto;
}
.cm-table th, .cm-table td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.75rem;
  text-align: center;
}
.cm-table th {
  background: var(--bg-alt, var(--panel));
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ── Interactive dashboard ── */
.dashboard {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* Controls bar */
.controls-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

/* Charts grid */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}
@media (max-width: 640px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}
.chart-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  position: relative;
}
.chart-card h4 {
  margin: 0 0 0.5rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.chart-card canvas {
  width: 100% !important;
  height: 250px !important;
}

/* Decision boundary — full width above grid */
.chart-card.full-width {
  margin-bottom: 1.25rem;
}
.db-layout {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}
.db-square {
  width: 70%;
  flex-shrink: 0;
  aspect-ratio: 1 / 1;
  position: relative;
}
.db-square canvas {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
}

/* Model info panel */
.model-info {
  flex: 1;
  min-width: 0;
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.5;
}
.model-info h5 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fg);
}
.model-info .info-section {
  margin-bottom: 0.75rem;
}
.model-info .info-section-title {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.25rem;
}
.model-info table {
  width: 100%;
  border-collapse: collapse;
}
.model-info td {
  padding: 0.15rem 0.4rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.model-info td:first-child {
  color: var(--muted);
  white-space: nowrap;
  font-size: 0.72rem;
}
.model-info td:last-child {
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.model-info .info-desc {
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 0.75rem;
}

@media (max-width: 640px) {
  .db-layout {
    flex-direction: column;
  }
  .db-square {
    width: 100%;
    max-width: 400px;
  }
}

/* ── Metrics table ── */
.metrics-wrap {
  margin-top: 1.25rem;
}
.metrics-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.82rem;
}
.metrics-table th, .metrics-table td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  text-align: center;
}
.metrics-table th {
  background: var(--bg-alt, var(--panel));
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.metrics-table td:first-child {
  text-align: left;
  font-weight: 500;
}
.metrics-table tr.better td {
  /* subtle highlight for better metric */
}
.val-good {
  color: var(--green);
  font-weight: 600;
}
.val-bad {
  color: var(--red);
  font-weight: 600;
}

/* ── Confusion matrix visual ── */
.cm-grid {
  display: grid;
  grid-template-columns: auto 1fr 1fr;
  grid-template-rows: auto 1fr 1fr;
  gap: 2px;
  max-width: 260px;
  margin: 0 auto;
  font-family: var(--sans);
  font-size: 0.8rem;
}
.cm-header {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--muted);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.cm-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 0.5rem;
  border-radius: 4px;
  font-weight: 700;
  font-size: 1.1rem;
  min-height: 60px;
}
.cm-cell .cm-label {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--muted);
  margin-top: 2px;
}
.cm-tp { background: rgba(34,197,94,0.12); color: var(--green); }
.cm-tn { background: rgba(59,130,246,0.10); color: var(--c1); }
.cm-fp { background: rgba(239,68,68,0.10); color: var(--red); }
.cm-fn { background: rgba(245,158,11,0.10); color: var(--c2); }

/* ── Footer ── */
.article-footer {
  max-width: 740px;
  margin: 3rem auto 0;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--muted);
}