.pinyin-content {
  background: #fff;
  border-radius: var(--border-radius);
  padding: 24px;
  margin-top: 20px;
  box-shadow: var(--shadow);
}

.pinyin-section {
  margin-bottom: 32px;
}

.pinyin-section:last-child {
  margin-bottom: 0;
}

.pinyin-section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--primary);
  display: inline-block;
}

.pinyin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: 12px;
  list-style: none;
}

.alphabet-grid {
  grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
}

.shengmu-grid,
.yunmu-grid,
.zhengti-grid {
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
}

.pinyin-grid li {
  list-style: none;
}

.letter-item {
  background: var(--gray-50);
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  padding: 12px 8px;
  text-align: center;
  transition: all 0.2s ease;
}

.letter-item span {
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--gray-700);
}

.audio-item {
  background: var(--gray-50);
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  padding: 10px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.audio-item:hover {
  border-color: var(--primary);
  background: #eef2ff;
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(79, 70, 229, 0.1);
}

.audio-item:active {
  transform: translateY(0);
}

.audio-item.playing {
  border-color: var(--primary);
  background: #eef2ff;
  animation: pulse 0.6s ease-in-out;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.audio-item span {
  display: block;
  font-size: 2.1rem;
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.4;
}

.audio-item span i {
  display: block;
  font-size: 1.25rem;
  font-style: normal;
  color: var(--gray-500);
  font-weight: 400;
  margin-top: 2px;
}

.audio-icon {
  display: block;
  font-size: 1.25rem;
  color: var(--primary);
  margin-top: 4px;
  font-style: normal;
  opacity: 0.6;
}

.audio-item:hover .audio-icon {
  opacity: 1;
}

/* 信息区域样式 */
.info-section {
  background: #fff;
  border-radius: var(--border-radius);
  padding: 24px;
  margin-top: 20px;
  box-shadow: var(--shadow);
}

.info-section h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 16px;
}

.info-content {
  color: var(--gray-600);
  line-height: 1.8;
}

.info-content p {
  margin-bottom: 12px;
}

.info-content ul {
  margin: 8px 0 16px 24px;
}

.info-content li {
  margin-bottom: 8px;
  list-style: disc;
}

.info-content ul ul {
  margin-top: 8px;
  margin-bottom: 8px;
}

/* 链接区域样式 */
.links-section {
  background: #fff;
  border-radius: var(--border-radius);
  padding: 24px;
  margin-top: 20px;
  box-shadow: var(--shadow);
}

.links-section h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 16px;
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.links-grid a {
  color: var(--gray-600);
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 6px;
  transition: all 0.2s;
  font-size: 0.9rem;
}

.links-grid a:hover {
  color: var(--primary);
  background: var(--gray-50);
}

/* 页脚样式 */
footer {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--gray-200);
  color: var(--gray-500);
  font-size: 0.9rem;
}

footer p {
  margin-bottom: 8px;
}

footer a {
  color: var(--primary);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 640px) {
  .container {
    padding: 20px 16px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .pinyin-grid {
    grid-template-columns: repeat(auto-fill, minmax(65px, 1fr));
    gap: 8px;
  }

  .audio-item {
    padding: 8px 6px;
  }

  .audio-item span {
    font-size: 1rem;
  }

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