.knowledge-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 1000;
}
.knowledge-popup {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translateX(-50%) translateY(-50%);
  width: 340px;
  background: #fff;
  border-radius: 16px 16px 0 0;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.15);
  z-index: 1001;
  overflow: hidden;
}
.knowledge-popup-title {
  text-align: center;
  font-size: 17px;
  font-weight: 600;
  padding: 16px 0 8px;
  border-bottom: 1px solid #f0f0f0;
}
.knowledge-popup-amount-label {
  text-align: center;
  font-size: 14px;
  color: #888;
  margin-top: 12px;
}
.knowledge-popup-amount-value {
  text-align: center;
  font-size: 28px;
  font-weight: 700;
  color: #111;
  margin: 6px 0 20px;
}
.knowledge-payment-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1.5px solid #ccc;
  border-radius: 10px;
  margin: 10px 20px;
  padding: 10px 14px;
  cursor: pointer;
}
.knowledge-payment-option.active {
  border-color: #00c453;
  background-color: #f6fffa;
}
.knowledge-payment-option-content {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
}
.knowledge-payment-icon {
  width: 24px;
  height: 24px;
}
.knowledge-check-icon {
  color: #00c453;
  font-size: 16px;
  font-weight: 700;
}
.knowledge-popup-buttons {
  display: flex;
  gap: 10px;
  margin: 20px;
}
.knowledge-btn {
  flex: 1;
  padding: 12px;
  font-size: 16px;
  border-radius: 8px;
  border: 0;
  cursor: pointer;
}
.knowledge-btn-cancel {
  background: #f1f5f9;
  color: #333;
}
.knowledge-btn-confirm {
  background: linear-gradient(to right, #3b82f6, #60a5fa);
  color: #fff;
}
.knowlege-button {
  display: block;
  width: 200px;
  height: 48px;
  margin: 0 auto;
  background: linear-gradient(135deg, #ff4d4f, #ff7a45);
  color: #fff;
  text-align: center;
  line-height: 48px;
  font-size: 18px;
  font-weight: 600;
  border-radius: 28px;
  text-decoration: none;
  box-shadow: 0 10px 25px -5px rgba(255, 77, 79, 0.3);
  transition: all 0.3s ease;
  border: 0;
  cursor: pointer;
  outline: 0;
  -webkit-tap-highlight-color: transparent;
}
.knowlege-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 30px -5px rgba(255, 77, 79, 0.4);
}
.fa-credit-card {
  font-size: 24px;
  color: #1677ff;
  margin-right: 16px;
}
.fa-weixin {
  font-size: 24px;
  color: #07c160;
  margin-right: 16px;
}
.knowledge-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}
.knowledge-modal-box {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  padding: 20px 30px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  text-align: center;
}
.knowledge-flat-btn {
  padding: 10px 20px;
  margin: 10px;
  color: #fff;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.2s ease;
}
.knowledge-unpaid-btn {
  background: #f1f5f9;
  color: #333;
}
.knowledge-paid-btn {
  background: linear-gradient(to right, #3b82f6, #60a5fa);
  color: #fff;
}
.knowledge-loading {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 9999;
  color: #fff;
}
.knowledge-loading-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 1000;
}