.hero-actions {
  margin-top: 18px;
}
.hero-kicker {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
}
.home-explorer {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.home-explorer > div { min-width: 0; }
.hero .home-explorer svg { margin: 0; }
.home-explorer h3 { font-size: 16px; line-height: 1.4; }
.hero .home-explorer p { font-size: 13px; }
.demo-readout { margin: 14px 0 10px; font-size: 14px; }
.demo-link { display: inline-block; margin-top: 12px; font-size: 13px; font-weight: 600; }
.paths-title { font-size: 16px; margin: 24px 0 10px; }
.learning-paths {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 28px;
}
.path-link {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}
.path-link:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.path-number { color: var(--brand); font-size: 12px; font-weight: 650; padding-top: 2px; }
.path-link strong { display: block; font-size: 13px; }
.path-link small { display: block; color: var(--muted); font-size: 12px; margin-top: 4px; }
.path-arrow { margin-left: auto; color: var(--accent); }
.form-heading { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 14px; }
.form-heading h3 { font-size: 18px; }
.form-description { margin: 4px 0 12px; color: var(--muted); font-size: 13px; }
@media (max-width: 1100px) and (min-width: 901px), (max-width: 650px) {
  .home-explorer, .learning-paths { grid-template-columns: minmax(0, 1fr); }
  .home-explorer { gap: 16px; }
}
.guide-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 12px 16px;
  margin-bottom: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font-size: 13px;
}
.guide-jump strong {
  flex-basis: 100%;
  color: var(--muted);
}
.hero-actions a {
  text-decoration: none;
}
.dual-plots {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.lesson-results {
  display: grid;
  gap: 8px;
  font-variant-numeric: tabular-nums;
  overflow-x: auto;
}
.lesson-results p {
  overflow-wrap: anywhere;
}
.lesson-extras {
  margin-top: 10px;
}
.source-panel {
  margin-top: 20px;
}
.source-panel a {
  display: block;
}
.practice {
  display: grid;
  gap: 12px;
}
.practice .q {
  font-size: 16px;
  max-width: 75ch;
  line-height: 1.7;
}
.practice .ans-row input {
  width: min(100%, 22em);
}
.practice .seg {
  justify-self: start;
}
.practice > .btn {
  justify-self: start;
}
.practice details input {
  max-width: 12em;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
}
.practice summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
}
.practice .worked {
  max-width: 100%;
  overflow: auto;
}
.lesson-extras .tbl {
  width: 100%;
}
.sec > h3 {
  overflow-wrap: anywhere;
}
.panel {
  min-width: 0;
}
.eq-display .katex {
  font-size: 1em;
}
.eq-display {
  overflow: auto;
  max-width: 100%;
  padding-bottom: 8px;
}
.lesson-results .katex {
  white-space: normal;
}
.hero svg {
  display: block;
}
@media (max-width: 650px) {
  .dual-plots {
    grid-template-columns: 1fr;
  }
  .brand h1 {
    font-size: 14px;
  }
  .header-tools {
    gap: 4px;
  }
  .app-header {
    padding: 10px 12px;
    gap: 6px;
  }
  .brand-link {
    gap: 6px;
  }
  .brand {
    gap: 6px;
  }
  .seg button {
    padding: 6px 8px;
  }
  .layout {
    padding: 12px;
  }
  .sec {
    padding: 14px 12px;
  }
  .hero {
    padding: 20px 16px;
  }
  .hero h2 {
    font-size: 27px;
  }
  .practice .ans-row input {
    width: 100%;
  }
}
@media print {
  .sidebar,
  .app-header,
  .plot-tools,
  .chapter-nav,
  .hero-actions,
  .source-panel,
  .practice button,
  .practice input,
  .practice .seg {
    display: none !important;
  }
  .layout {
    display: block;
    padding: 0;
  }
  .sec {
    break-inside: avoid;
    box-shadow: none;
  }
  .plot-wrap {
    break-inside: avoid;
  }
  .panel {
    break-inside: avoid;
  }
  body {
    background: white;
    color: black;
  }
}