.learn-page {
  max-width: 1080px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.learn-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 4px;
}
.learn-head h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  font-weight: 850;
  letter-spacing: -.02em;
  color: var(--text-primary);
  line-height: 1.35;
}
.learn-meta {
  font-size: calc(12.5px * var(--fs-scale, 1));
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.learn-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.learn-actions .btn {
  flex: 0 1 auto;
}

.learn-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.learn-item {
    display: flex;
  flex-direction: column;
  gap: 6px;
}
.learn-item h3 {
  margin: 0;
  font-size: calc(15px * var(--fs-scale, 1));
  font-weight: 800;
  line-height: 1.55;
  color: var(--text-primary);
}
.learn-item p {
  margin: 0;
  font-size: calc(13.5px * var(--fs-scale, 1));
  line-height: 1.85;
  color: var(--text-secondary);
}
.learn-item .learn-meta {
  font-size: calc(11.5px * var(--fs-scale, 1));
  margin-top: 2px;
}

.refs-page {
  max-width: 1280px;
  margin-inline: auto;
}
.refs-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  padding: 16px 20px;
  margin-bottom: 24px;
  border-radius: 16px;
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 8px 24px -16px rgba(0, 0, 0, 0.4);
}
.refs-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  min-width: 0;
}
.refs-group--cols {
  margin-inline-start: auto;
}
.refs-lbl {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: calc(12px * var(--fs-scale, 1));
  font-weight: 700;
  color: var(--text-tertiary);
  white-space: nowrap;
  flex-shrink: 0;
}
.refs-lbl svg { width: 14px; height: 14px; }

.refs-chips {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  padding: 4px;
  background: color-mix(in srgb, var(--surface-nested) 50%, transparent);
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
}
.refs-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: calc(12.5px * var(--fs-scale, 1));
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
}
.refs-chip svg { width: 15px; height: 15px; }
.refs-chip:hover { 
  color: var(--text-primary); 
  background: color-mix(in srgb, var(--text-primary) 5%, transparent);
}
.refs-chip.on {
  background: var(--accent);
  color: var(--text-on-accent);
  box-shadow: 0 2px 8px -2px color-mix(in srgb, var(--accent) 50%, transparent);
}

.refs-sec { margin-bottom: 26px; }
.refs-sec-h {
  position: relative;
  margin: 0 0 14px;
  padding-inline-start: 12px;
  font-size: calc(17px * var(--fs-scale, 1));
  font-weight: 800;
  line-height: 1.5;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.refs-sec-h::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  border-radius: 2px;
  background: var(--accent);
}
.refs-sec-n {
  font-size: calc(12px * var(--fs-scale, 1));
  font-weight: 600;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}

#refsContainer {
  --refs-cols: 1;
}
.refs-page .fgrid {
  display: grid;
  grid-template-columns: repeat(var(--refs-cols, 1), minmax(0, 1fr)) !important;
  gap: 16px;
  width: 100%;
  max-width: none !important;
  margin-inline: 0 !important;
}
.refs-page .fcard {
  content-visibility: auto;
  contain-intrinsic-size: auto 180px;
}

@media (max-width: 900px) {
  .refs-group--cols { display: none; }
  .refs-page .fgrid { grid-template-columns: 1fr !important; }
}
.lab-page {
  max-width: 1380px;
  margin-inline: auto;
}
.lab-hero { margin-bottom: 20px; }

.lab-list .widget {
  max-width: 800px;
}
.lab-list .widget .wgrid {
  align-items: stretch;
}
.lab-list .widget .wgrid > div:last-child {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 0;
}
.lab-list .widget .wgrid > div:last-child > .winfo,
.lab-list .widget .wgrid > div:last-child > .props {
  margin-top: auto;
}

@media (max-width: 900px) {
  .lab-list .widget {
    max-width: none;
  }
  .lab-list .widget .wgrid {
    align-items: start;
  }
  .lab-list .widget .wgrid > div:last-child {
    display: block;
  }
  .lab-list .widget .wgrid > div:last-child > .winfo,
  .lab-list .widget .wgrid > div:last-child > .props {
    margin-top: 15px;
  }
}
.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 28px;
  align-items: start;
}
.lab-main {
  min-width: 0;
  max-width: 860px;
}
.lab-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.lab-list .widget {
  margin-bottom: 12px;
}
.lab-side {
  position: sticky;
  top: calc(var(--topbar-h, 64px) + 16px);
  align-self: start;
  max-height: calc(100vh - var(--topbar-h, 64px) - 32px);
  display: flex;
  flex-direction: column;
}
.lab-side .pss-card {
  padding: 14px 16px;
  border-radius: 14px;
  background: var(--surface-raised);
  border: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  min-height: 0;
  max-height: calc(100vh - var(--topbar-h, 64px) - 32px);
}
.lab-side .pss-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  font-size: calc(13px * var(--fs-scale, 1));
  font-weight: 800;
  color: var(--text-primary);
}
.lab-side .pss-head svg { width: 15px; height: 15px; color: var(--accent); flex-shrink: 0; }
.lab-side .pss-count {
  margin-inline-start: auto;
  font-size: calc(11px * var(--fs-scale, 1)); font-weight: 800;
  padding: 1px 8px; border-radius: 99px;
  background: var(--surface-nested); color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  font-variant-numeric: tabular-nums;
}
.lab-side .pss-nav {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
  scrollbar-width: thin;
}
.lab-side .pss-nav::-webkit-scrollbar { width: 5px; }
.lab-side .pss-nav::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--text-primary) 20%, transparent);
  border-radius: 99px;
}
.lab-side .pss-item {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-secondary);
  transition: background .18s var(--ease), color .18s var(--ease);
}
.lab-side .pss-item:hover,
.lab-side .pss-item.on {
  background: color-mix(in srgb, var(--accent) 10%, var(--surface-nested));
  color: var(--text-primary);
}
.lab-side .pss-num {
  display: grid; place-items: center;
  width: 26px; height: 26px; border-radius: 8px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
  color: var(--accent);
  font-size: calc(11.5px * var(--fs-scale, 1)); font-weight: 800;
  font-variant-numeric: tabular-nums; flex-shrink: 0;
}
.lab-side .pss-body { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.lab-side .pss-body b {
  font-size: calc(12.5px * var(--fs-scale, 1)); font-weight: 700; line-height: 1.5;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.lab-side .pss-meta { font-size: calc(10.5px * var(--fs-scale, 1)); color: var(--text-tertiary); }

@media (max-width: 1100px) {
  .lab-grid { grid-template-columns: 1fr; gap: 18px; }
  .lab-main { max-width: none; }
  .lab-side {
    position: static;
    max-height: none;
    order: -1;
  }
  .lab-side .pss-card { max-height: none; }
  .lab-side .pss-nav {
    overflow-y: visible;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }
}
@media (max-width: 640px) {
  .lab-side .pss-nav { grid-template-columns: 1fr; }
}

.graph-canvas {
  margin-top: 14px;
  padding: 16px;
  border-radius: 14px;
  background: var(--surface-nested);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.graph-canvas .mmd {
  margin: 0;
  width: 100%;
}

@media (max-width: 620px) {
  .learn-actions .btn { flex: 1 1 auto; justify-content: center; }
  .graph-canvas { padding: 10px; min-height: 180px; }
}

@media print {
  .learn-page { display: block !important; }
  .learn-actions { display: none !important; }
}