.page-hero {
  background:
    radial-gradient(circle at 82% 18%, rgba(201,154,46,.24), transparent 28%),
    linear-gradient(135deg, var(--green-dark), var(--green));
  color: #fff;
  padding: 68px 0 62px;
}

.reference-hero-grid {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 48px;
  align-items: center;
}

.reference-card p {
  color: rgba(255,255,255,.9);
  margin-bottom: 0;
}

.reference-tools {
  margin-top: 30px;
  display: grid;
  gap: 16px;
}

.search-box span {
  display: block;
  margin-bottom: 6px;
  color: var(--green-dark);
  font-weight: 850;
}

.search-box input {
  width: 100%;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 14px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}

.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-tab {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--green-dark);
  border-radius: 999px;
  padding: 8px 12px;
  font: inherit;
  font-size: .9rem;
  font-weight: 850;
  cursor: pointer;
}

.filter-tab.active {
  background: var(--green);
  border-color: var(--green);
  color: #fff;
}

.reference-layout {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
}

.class-panel {
  position: sticky;
  top: 110px;
  background: linear-gradient(135deg, var(--green-light), #fff);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px;
}

.class-panel h3 {
  margin: 0 0 8px;
  color: var(--green-dark);
}

.class-panel p {
  color: var(--muted);
  margin: 0;
}

.class-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.class-stats span {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--green-dark);
  font-size: .82rem;
  font-weight: 850;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.method-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.method-card summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 22px;
}

.method-card summary::-webkit-details-marker {
  display: none;
}

.method-class {
  display: inline-flex;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--gold-light);
  color: #73580d;
  font-size: .74rem;
  font-weight: 850;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.method-card h3 {
  margin: 10px 0 7px;
  color: var(--green-dark);
  font-size: 1.08rem;
}

.method-card p {
  color: var(--muted);
  margin: 0;
}

.method-details {
  border-top: 1px solid var(--line);
  padding: 18px 22px 22px;
  display: grid;
  gap: 14px;
}

.method-example {
  margin: 0;
  background: #17261f;
  color: #dfe9e4;
  border-radius: 12px;
  padding: 14px;
  overflow-x: auto;
  font: 500 .9rem/1.45 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}

.method-reminder {
  border-left: 4px solid var(--gold);
  background: var(--gold-light);
  border-radius: 0 12px 12px 0;
  padding: 12px 14px;
  color: #5e4610;
}

.practice-shell {
  margin-top: 28px;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 22px;
  align-items: stretch;
}

.practice-shell > div,
.answer-panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.practice-label {
  display: inline-flex;
  margin: 0 0 12px;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--gold-light);
  color: #73580d;
  font-size: .76rem;
  font-weight: 850;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.practice-code {
  margin: 16px 0 0;
  background: #17261f;
  color: #dfe9e4;
  border-radius: 14px;
  padding: 18px;
  overflow-x: auto;
}

.practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.action-btn {
  border: 0;
  border-radius: 999px;
  padding: 10px 15px;
  font: inherit;
  font-weight: 850;
  cursor: pointer;
}

.action-primary {
  background: var(--green);
  color: #fff;
}

.action-secondary {
  background: var(--green-light);
  color: var(--green-dark);
}

.answer-panel h3 {
  color: var(--green-dark);
  margin-top: 0;
}

.answer-panel p {
  color: var(--muted);
}

.no-results {
  grid-column: 1 / -1;
  padding: 28px;
  text-align: center;
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
}

@media (max-width: 980px) {
  .reference-hero-grid,
  .reference-layout,
  .practice-shell {
    grid-template-columns: 1fr;
  }

  .class-panel {
    position: static;
  }

  .method-grid {
    grid-template-columns: 1fr;
  }
}