#learn_index {
  max-width: 800px;
  padding: 40px 0 80px;
}

#learn_index h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.learn-subtitle {
  font-size: 15px;
  color: var(--color-greyMedium);
  margin-bottom: 40px;
}

#learn_articles {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.learn-article-card {
  display: block;
  padding: 20px 24px;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
}

.learn-article-card:hover {
  border-color: var(--color-primary);
  background: var(--color-bgHover, rgba(255, 255, 255, 0.03));
}

.learn-article-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.learn-article-card p {
  font-size: 13px;
  color: var(--color-greyMedium);
  margin: 0;
}

.learn-empty {
  font-size: 14px;
  color: var(--color-greyMedium);
}

/* ── Index section header ── */
.learn-section-header {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-greyMedium);
  margin: 28px 0 8px;
}

/* ── Decision tree ── */
.learn-decision-tree {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 24px 0;
}

.learn-decision-node {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0 12px;
  align-items: start;
}

.learn-decision-question {
  border: 1.5px solid var(--color-border);
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 14px;
  font-weight: 500;
  position: relative;
}

.learn-decision-question::before {
  content: '?';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-primary, #5865f2);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  margin-right: 10px;
  flex-shrink: 0;
  vertical-align: middle;
}

.learn-decision-yes {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding-top: 14px;
}

.learn-decision-yes-label {
  font-size: 11px;
  font-weight: 600;
  color: #4caf7d;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.learn-decision-result {
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.learn-decision-result.type-a { background: rgba(76, 175, 125, 0.15); color: #4caf7d; }
.learn-decision-result.type-b { background: rgba(150, 150, 150, 0.15); color: var(--color-greyDark); }
.learn-decision-result.type-c { background: rgba(88, 101, 242, 0.15); color: var(--color-primary, #5865f2); }

.learn-decision-connector {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 0 6px 22px;
  font-size: 11px;
  font-weight: 600;
  color: var(--color-greyMedium);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.learn-decision-connector::before {
  content: '';
  display: block;
  width: 1.5px;
  height: 20px;
  background: var(--color-border);
}

/* ── Article page elements ── */
.learn-flow {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 24px 0;
}

.learn-flow-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.learn-flow-arrow {
  text-align: center;
  font-size: 18px;
  color: var(--color-greyMedium);
  padding: 4px 0;
  margin-left: 20px;
}

.learn-flow-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary, #5865f2);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.learn-flow-body > strong {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 4px;
}

.learn-flow-body p {
  font-size: 13px;
  color: var(--color-greyDark);
  margin: 0;
}

.learn-patterns {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.learn-pattern-card {
  padding: 16px 18px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.learn-pattern-card h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.learn-pattern-card p {
  font-size: 13px;
  color: var(--color-greyDark);
  margin-bottom: 10px;
}

.learn-pattern-card code {
  display: block;
  font-size: 11px;
  background: var(--color-bgCode, #1a1a1a);
  color: #a8d8a8;
  padding: 8px 10px;
  border-radius: 6px;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
}

.learn-code {
  background: var(--color-bgCode, #1a1a1a);
  color: #a8d8a8;
  font-size: 12.5px;
  line-height: 1.6;
  padding: 16px 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 16px 0;
  white-space: pre;
}

.learn-table-wrap {
  overflow-x: auto;
  margin: 16px 0;
}

.learn-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.learn-table th {
  text-align: left;
  padding: 8px 12px;
  background: var(--color-bgHover, rgba(255, 255, 255, 0.04));
  font-weight: 600;
  border-bottom: 1px solid var(--color-border);
}

.learn-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--color-border);
}

.learn-table td:first-child {
  white-space: nowrap;
}

.learn-table td.positive {
  color: #4caf7d;
  font-weight: 600;
}
.learn-table td.negative {
  color: #e05252;
  font-weight: 600;
}

.learn-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.learn-stat-card {
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-align: center;
}

.learn-stat-label {
  font-size: 11px;
  color: var(--color-greyMedium);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.learn-stat-value {
  font-size: 22px;
  font-weight: 700;
}

.learn-stat-value.positive {
  color: #4caf7d;
}
.learn-stat-value.negative {
  color: #e05252;
}

.learn-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-greyDark);
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}

.learn-back-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

#docs_content .learn-back-btn:first-child {
  margin-bottom: 24px;
}

#docs_content .learn-back-btn:last-child {
  margin-top: 24px;
}

.learn-callout {
  background: rgba(88, 101, 242, 0.08);
  border-left: 3px solid var(--color-primary, #5865f2);
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  font-size: 13.5px;
  line-height: 1.6;
  margin: 20px 0;
}

@media (max-width: 768px) {
  /* article content */
  #docs_content {
    max-width: 100%;
    min-width: 0;
  }

  /* code blocks: scroll horizontally, don't overflow */
  .learn-code {
    font-size: 11.5px;
    padding: 12px 14px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    word-break: normal;
    overflow-wrap: normal;
  }

  .learn-pattern-card code {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    word-break: normal;
  }

  /* tables: scroll horizontally */
  .learn-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .learn-table {
    min-width: 480px;
  }

  /* layout fixes */
  .learn-patterns {
    grid-template-columns: 1fr;
  }
  .learn-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .learn-flow-step {
    padding: 12px 14px;
  }
}