/* logistic-regression-lab.css
   Styles for the FIG. 07 lab. Page chrome matches the template
   pattern; lab-specific styles live below the marker.
*/

.lr-main {
  background: var(--paper);
  color: var(--ink);
}

/* Hero */
.lr-hero {
  padding: 120px 48px 60px;
  max-width: 1200px;
}
.lr-title { margin-top: 22px; }
.lr-kicker {
  margin-top: 24px;
  max-width: 720px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.lr-dateline {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  max-width: 900px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.lr-dateline .label { color: var(--ink-dim); }
.lr-dateline .value {
  color: var(--ink);
  margin-top: 4px;
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 12px;
}

/* Sections */
.lr-section {
  padding: 80px 48px;
  max-width: 1200px;
}
.lr-section .section-label { margin-bottom: 28px; }
.lr-prose { max-width: 720px; }
.lr-prose p {
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
}
.lr-lede {
  font-family: "Newsreader", Georgia, serif;
  font-style: italic;
  font-size: 22px !important;
  line-height: 1.4 !important;
  color: var(--ink) !important;
}
.lr-note {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-bottom: 36px;
}

/* How-it-works grid */
.lr-how-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
  margin-top: 12px;
}
.lr-how-card {
  border-top: 1px solid var(--ink);
  padding-top: 18px;
}
.lr-how-fig {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.lr-how-title {
  font-size: 26px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 400;
  margin: 0 0 12px;
}
.lr-how-card p {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* Failure modes grid (§ IV) */
.lr-fail-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--ink);
  margin-top: 16px;
}
.lr-fail-card {
  padding: 22px 22px 24px;
  border-right: 1px solid var(--ink);
}
.lr-fail-card:last-child { border-right: none; }
.lr-fail-tag {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.lr-fail-title {
  font-size: 22px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 400;
  margin: 0 0 10px;
}
.lr-fail-card p {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* Receipts */
.lr-receipts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--ink);
  margin-top: 16px;
}
.lr-receipt {
  padding: 22px 20px;
  border-right: 1px solid var(--ink);
}
.lr-receipt:last-child { border-right: none; }
.lr-receipt-label {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.lr-receipt-value {
  font-family: "Newsreader", Georgia, serif;
  font-size: 32px;
  line-height: 1;
  color: var(--ink);
}
.lr-receipt-value .small {
  font-size: 14px;
  color: var(--ink-soft);
  margin-left: 6px;
}

.lr-colophon-section { padding-bottom: 80px; }

/* ──────────────────────────────────────────────────────────── */
/* LAB-SPECIFIC                                                 */
/* ──────────────────────────────────────────────────────────── */

.lr-section-demo .section-label { margin-bottom: 12px; }

.lr-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 32px;
  align-items: start;
}

.lr-canvas-wrap {
  position: relative;
  border: 1px solid var(--ink);
  background: var(--paper);
}
#lr-canvas {
  display: block;
  width: 100%;
  height: auto;
  cursor: crosshair;
}
.lr-canvas-hint {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
  background: var(--paper);
  padding: 4px 8px;
  border: 1px solid var(--ink-dim);
}

.lr-controls {
  border: 1px solid var(--ink);
  padding: 18px 18px 22px;
  background: var(--paper);
}
.lr-control-head {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 10px;
}
.lr-control-head:not(:first-child) { margin-top: 18px; }

.lr-class-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--ink);
}
.lr-class-toggle button {
  font-family: "DM Mono", monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  background: var(--paper);
  color: var(--ink);
  border: none;
  padding: 10px 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 160ms ease, color 160ms ease;
}
.lr-class-toggle button + button {
  border-left: 1px solid var(--ink);
}
.lr-class-toggle button.active {
  background: var(--ink);
  color: var(--paper);
}
.lr-class-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.lr-class-dot.pos { background: var(--accent); }
.lr-class-dot.neg { background: var(--ink); border: 1px solid var(--paper); }

.lr-field { display: block; margin-bottom: 14px; }
.lr-field:last-of-type { margin-bottom: 0; }
.lr-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink);
  margin-bottom: 6px;
}
.lr-field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.lr-buttons {
  display: flex;
  gap: 8px;
  align-items: center;
}
.lr-btn {
  flex: 1;
  font-family: "DM Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 9px 10px;
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease;
}
.lr-btn:hover { background: var(--ink); color: var(--paper); }
.lr-btn.primary { background: var(--ink); color: var(--paper); }
.lr-btn.primary:hover { background: var(--accent); }

.lr-preset-select {
  width: 100%;
  font-family: "DM Mono", monospace;
  font-size: 12px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  padding: 9px 10px;
  cursor: pointer;
}

/* Metrics row */
.lr-metrics-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 24px;
  margin-top: 32px;
}
.lr-metric-card {
  border: 1px solid var(--ink);
  padding: 18px 20px 20px;
  background: var(--paper);
}
.lr-mc-head {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 0 0 14px;
}
.lr-mc-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  row-gap: 14px;
  column-gap: 16px;
}
.lr-mc-val {
  font-size: 26px;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.lr-pct { font-size: 14px; color: var(--ink-soft); margin-left: 2px; }
.lr-mc-lbl {
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-top: 4px;
}
.lr-loss-chart-card #lr-loss-chart {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 6px;
}
.lr-loss-note {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  text-transform: none;
  line-height: 1.4;
}

/* Mobile */
@media (max-width: 900px) {
  .lr-hero, .lr-section { padding-left: 24px; padding-right: 24px; }
  .lr-how-grid { grid-template-columns: 1fr; gap: 24px; }
  .lr-fail-grid { grid-template-columns: 1fr; }
  .lr-fail-card { border-right: none; border-bottom: 1px solid var(--ink); }
  .lr-fail-card:last-child { border-bottom: none; }
  .lr-receipts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lr-receipt:nth-child(2n) { border-right: none; }
  .lr-dateline { grid-template-columns: 1fr; gap: 14px; }
  .lr-layout { grid-template-columns: 1fr; }
  .lr-metrics-row { grid-template-columns: 1fr; }
}
@media (max-width: 540px) {
  .lr-receipts { grid-template-columns: 1fr; }
  .lr-receipt { border-right: none; }
  .lr-mc-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}