.auth-body {
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(255, 159, 67, 0.26), transparent 30%),
    linear-gradient(180deg, #fff8f3 0%, #f7f7f7 100%);
  color: #333;
}

.auth-header {
  width: 1100px;
  max-width: calc(100% - 32px);
  height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.auth-logo {
  color: #ff6b35;
  font-size: 24px;
  font-weight: 800;
}

.auth-back {
  color: #666;
  font-size: 14px;
}

.auth-back:hover {
  color: #ff6b35;
}

.auth-container {
  width: 1100px;
  max-width: calc(100% - 32px);
  min-height: calc(100vh - 190px);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 28px 0 42px;
}

.auth-card {
  width: 430px;
  max-width: 100%;
  padding: 34px 34px 28px;
  border-radius: 26px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(255, 107, 53, 0.16);
}

.register-card {
  width: 520px;
}

.auth-title {
  margin-bottom: 26px;
  text-align: center;
}

.auth-title h1 {
  margin-bottom: 8px;
  color: #222;
  font-size: 30px;
}

.auth-title p {
  color: #777;
  font-size: 14px;
  line-height: 1.7;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-size: 15px;
  font-weight: 700;
}

.form-group input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  border: 1px solid #e6e6e6;
  border-radius: 14px;
  outline: none;
  color: #333;
  background: #fafafa;
  font-size: 14px;
  transition: 0.2s;
}

.form-group input:focus {
  border-color: #ff9f43;
  background: #fff;
  box-shadow: 0 0 0 4px rgba(255, 159, 67, 0.13);
}

.form-tip {
  margin-top: 6px;
  color: #999;
  font-size: 12px;
  line-height: 1.5;
}

.form-tip.success {
  color: #19a05f;
}

.form-tip.error {
  color: #e74c3c;
}

.code-row {
  display: flex;
  gap: 10px;
}

.code-row input {
  flex: 1;
}

.code-row button {
  width: 120px;
  height: 44px;
  border-radius: 14px;
  background: #fff4ed;
  color: #ff6b35;
  font-size: 13px;
  white-space: nowrap;
}

.code-row button:hover {
  background: #ff6b35;
  color: #fff;
}

.code-row button:disabled {
  cursor: not-allowed;
  background: #eeeeee;
  color: #aaa;
}

.auth-submit {
  width: 100%;
  height: 46px;
  margin-top: 4px;
  border-radius: 999px;
  background: linear-gradient(135deg, #ff6b35, #ff9f43);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  transition: 0.2s;
}

.auth-submit:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 22px rgba(255, 107, 53, 0.28);
}

.auth-switch {
  margin-top: 22px;
  text-align: center;
  color: #777;
  font-size: 14px;
}

.auth-switch a {
  color: #ff6b35;
  font-weight: 700;
}

.demo-box {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 16px;
  background: #fff7f1;
  color: #888;
  font-size: 13px;
  line-height: 1.7;
}

.auth-footer {
  padding: 24px 16px 30px;
  color: #888;
  text-align: center;
  font-size: 13px;
}

.auth-footer a {
  color: #888;
}

.auth-footer a:hover {
  color: #ff6b35;
}

@media (max-width: 620px) {
  .auth-card,
  .register-card {
    width: 100%;
    padding: 28px 22px 24px;
  }

  .auth-title h1 {
    font-size: 26px;
  }

  .code-row {
    flex-direction: column;
  }

  .code-row button {
    width: 100%;
  }
}
<div class="form-group">
  <label for="loginPassword">密码</label>
  <input type="password" id="loginPassword" placeholder="请输入密码">
  <div class="password-row-tip">
    <p class="form-tip">请输入注册时设置的密码。</p>
    <a href="forgot-password.html">忘记密码？</a>
  </div>
</div>
.code-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.code-row input {
  flex: 1;
}

.send-code-btn {
  width: 120px;
  height: 42px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #ff6b35, #ff9f43);
  color: #fff;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}

.send-code-btn:hover {
  opacity: 0.9;
}

.send-code-btn:disabled {
  background: #ddd;
  color: #888;
  cursor: not-allowed;
}