/* /learn 学习操作系统 — 只用 --zc-* token */
.learn-wrap {
  max-width: 960px;
}

.learn-hero-icon {
  font-size: 3rem;
  color: var(--zc-accent-solid, #0f766e);
}

.learn-steps {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.5rem;
  margin: 1.5rem 0;
}

.learn-step {
  background: var(--zc-surface, #fff);
  border: 1px solid var(--zc-border, #e5e7eb);
  border-radius: 0.75rem;
  padding: 0.75rem 0.5rem;
  text-align: center;
}

.learn-step .k {
  display: block;
  font-weight: 700;
  color: var(--zc-accent-solid, #0f766e);
  font-size: 0.95rem;
}

.learn-step .v {
  display: block;
  color: var(--zc-text-3, #5f6b7a);
  font-size: 0.75rem;
  margin-top: 0.2rem;
}

.learn-map {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.learn-group-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--zc-text-3, #5f6b7a);
  margin-bottom: 0.5rem;
  letter-spacing: 0.04em;
}

.learn-cells {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.6rem;
}

.learn-cell {
  border: 1px solid var(--zc-border, #e5e7eb);
  border-radius: 0.75rem;
  padding: 0.7rem 0.75rem;
  background: var(--zc-surface, #fff);
  text-align: left;
  min-height: 4.5rem;
}

.learn-cell .name {
  font-weight: 600;
  font-size: 0.9rem;
}

.learn-cell .meta {
  font-size: 0.72rem;
  color: var(--zc-text-3, #5f6b7a);
  margin-top: 0.25rem;
}

.learn-cell.tone-solid {
  border-color: var(--zc-accent-solid, #0f766e);
  background: var(--zc-primary-soft, #ccfbf1);
}

.learn-cell.tone-grey {
  border-color: #d97706;
  background: #fff7ed;
}

.learn-cell.tone-weak {
  border-color: #64748b;
  background: #f8fafc;
}

.learn-cell.tone-empty {
  opacity: 0.72;
}

.learn-phase-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.learn-phase-bar span {
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--zc-border, #e5e7eb);
  color: var(--zc-text-3, #5f6b7a);
}

.learn-phase-bar span.on {
  background: var(--zc-accent-solid, #0f766e);
  color: #fff;
  border-color: transparent;
}

.learn-card {
  border: 1px solid var(--zc-border, #e5e7eb);
  border-radius: 1rem;
  padding: 1.25rem 1.35rem;
  background: var(--zc-surface, #fff);
}

.learn-card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.learn-trap {
  background: #fff7ed;
  border-radius: 0.6rem;
  padding: 0.7rem 0.85rem;
  color: #9a3412;
}

.learn-options {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  margin-top: 1rem;
}

.learn-opt {
  text-align: left;
  border: 1px solid var(--zc-border, #e5e7eb);
  border-radius: 0.75rem;
  padding: 0.85rem 1rem;
  background: #fff;
  font-size: 1rem;
}

.learn-opt:hover,
.learn-opt:focus {
  border-color: var(--zc-accent-solid, #0f766e);
}

.learn-opt.ok {
  background: var(--zc-primary-soft, #ccfbf1);
  border-color: var(--zc-accent-solid, #0f766e);
}

.learn-opt.bad {
  background: #fef2f2;
  border-color: #ef4444;
}

.learn-opt-row {
  display: flex;
  align-items: stretch;
  gap: 0.4rem;
}

.learn-opt-row .learn-opt {
  flex: 1;
}

.learn-tts-btn {
  flex: 0 0 2.5rem;
  border: 1px solid var(--zc-border, #e5e7eb);
  border-radius: 0.75rem;
  background: #fff;
  color: var(--zc-accent-solid, #0f766e);
  font-size: 1.1rem;
  line-height: 1;
}

.learn-tts-btn:hover,
.learn-tts-btn:focus {
  border-color: var(--zc-accent-solid, #0f766e);
  background: var(--zc-primary-soft, #ccfbf1);
}

.learn-stem-row {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.learn-stem-row .stem {
  flex: 1;
  font-size: 1.15rem;
  font-weight: 600;
}

.learn-auto-speak {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  color: var(--zc-text-3, #5f6b7a);
  margin-left: auto;
}

.learn-usage {
  margin-top: 0.85rem;
  padding: 0.75rem 0.85rem;
  border-radius: 0.75rem;
  background: var(--zc-primary-soft, #ccfbf1);
  border: 1px solid var(--zc-accent-solid, #0f766e);
}

.learn-usage-k {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--zc-accent-solid, #0f766e);
  margin-bottom: 0.3rem;
}

.learn-usage-en {
  font-weight: 600;
}

.learn-usage-zh {
  margin-top: 0.3rem;
  font-size: 0.88rem;
  color: var(--zc-text-3, #5f6b7a);
}

.learn-explain {
  margin-top: 0.85rem;
  color: var(--zc-text-3, #5f6b7a);
  font-size: 0.9rem;
}

.learn-lesson-why {
  color: var(--zc-text-3, #5f6b7a);
}

.learn-lesson-trap {
  color: #9a3412;
}

.learn-progress {
  font-size: 0.85rem;
  color: var(--zc-text-3, #5f6b7a);
  margin-bottom: 0.5rem;
}

.learn-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.1rem;
}

@media (max-width: 720px) {
  .learn-steps {
    grid-template-columns: repeat(3, 1fr);
  }
}