page {
  background-color: #f7f8fa;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

.container {
  padding: 20px;
  max-width: 600px;
  margin: 0 auto;
}

/* 顶部选择区 */
.header-section {
  margin-bottom: 24px;
  display: flex;
  justify-content: center;
}

.category-picker {
  background: #ffffff;
  padding: 10px 24px;
  border-radius: 50px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  display: flex;
  align-items: center;
  gap: 10px;
  color: #333;
}

.category-picker .label {
  font-size: 14px;
  color: #888;
}

.category-picker .value {
  font-size: 18px;
  font-weight: 600;
  color: #007aff;
}

.category-picker .arrow {
  font-size: 12px;
  color: #ccc;
}

/* 核心转换卡片 */
.converter-card {
  background: #ffffff;
  border-radius: 20px;
  padding: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
}

.conversion-row {
  padding: 20px;
  position: relative;
}

.input-row {
  background-color: #fff;
  border-radius: 16px 16px 4px 4px;
}

.output-row {
  background-color: #f9fbfd; /* 稍微不同的背景色区分输入输出 */
  border-radius: 4px 4px 16px 16px;
}

.row-label {
  font-size: 12px;
  color: #999;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.row-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.value-input, .value-display {
  flex: 1;
  font-size: 32px;
  font-weight: 500;
  color: #333;
  height: 48px;
  line-height: 48px;
  min-width: 0; /* 防止flex子项溢出 */
}

.value-display {
  color: #007aff; /* 结果颜色高亮 */
}

/* 单位选择器 */
.unit-selector {
  margin-left: 15px;
}

.unit-text {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background-color: #f0f2f5;
  border-radius: 12px;
  font-size: 16px;
  color: #444;
  font-weight: 500;
  transition: background-color 0.2s;
}

.unit-text:active {
  background-color: #e1e4e8;
}

.unit-arrow {
  font-size: 10px;
  color: #888;
}

/* 分割线和图标 */
.divider {
  height: 1px;
  background-color: #eee;
  margin: 0 20px;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.icon-transfer {
  position: absolute;
  background: #fff;
  color: #ccc;
  font-size: 20px;
  padding: 0 10px;
  top: -14px;
}

.tips {
  text-align: center;
  margin-top: 30px;
  font-size: 13px;
  color: #ccc;
}